Patent Application
20240313931
The disclosure relates to a method and an apparatus for performing rate matching for uplink control information in a wireless communication system.
To meet the demand for wireless data traffic having increased since deployment of 4th generation (4G) communication systems, efforts have been made to develop an improved 5th generation (5G) or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called a “beyond 4G network” communication system or a “post long term evolution (post LTE)” system. The 5G communication system is considered to be implemented in ultrahigh frequency (mmWave) bands (e.g., 60 GHz bands) so as to accomplish higher data rates. To decrease propagation loss of the radio waves and increase the transmission distance in the ultrahigh frequency bands, beamforming, massive multiple-input multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam forming, large scale antenna techniques are discussed in 5G communication systems. In addition, in 5G communication systems, development for system network improvement is under way based on advanced small cells, cloud radio access networks (cloud RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, coordinated multi-points (COMP), reception-end interference cancellation and the like. In the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have also been developed.
The Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the Internet of things (IoT) where distributed entities, such as things, exchange and process information without human intervention. The Internet of everything (IoE), which is a combination of the IoT technology and the big data processing technology through connection with a cloud server, has emerged. As technology elements, such as “sensing technology”, “wired/wireless communication and network infrastructure”, “service interface technology”, and “security technology” have been demanded for IoT implementation, a sensor network, a machine-to-machine (M2M) communication, machine type communication (MTC), and so forth have been recently researched. Such an IoT environment may provide intelligent Internet technology (IT) services that create a new value to human life by collecting and analyzing data generated among connected things. IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing information technology (IT) and various industrial applications.
In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as a sensor network, machine type communication (MTC), and machine-to-machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas. Application of a cloud radio access network (cloud RAN) as the above-described big data processing technology may also be considered an example of convergence of the 5G technology with the IoT technology.
As various services can be provided according to the above description and the development of a wireless communication system, methods of smoothly providing the services are needed. Particularly, in order to effectively allocate frequency resources to various services in the wireless communication system, research on a method of applying rate matching to uplink control information during communication is required.
An aspect of the disclosure is to effectively allocate frequency resources in order to provide various services in a wireless communication system.
Embodiments disclosed therefor provide a method and an apparatus for performing rate matching of uplink control information in the wireless communication system.
In accordance with an aspect of the disclosure to solve the problem, a method of performing rate matching by a user equipment (UE) in a wireless communication system is provided. The method includes determining, in a slot including both an uplink channel and a downlink channel, a number of coded modulation symbols of uplink control information (UCI) to be multiplexed to a physical uplink shared channel (PUSCH), based on at least one of frequency resources of the downlink channels in a slot including both uplink channels and downlink channels or a time from a start point of the slot to an end point of the a physical uplink shared channel (PUSCH) in in the uplink channels, a number of coded modulation symbols of uplink control information (UCI) to be multiplexed to the PUSCH, and transmitting the PUSCH to which the UCI is multiplexed according to the determined number of coded modulation symbols.
In accordance with another aspect of the disclosure to solve the problem, a method of performing rate matching by a base station (BS) in a wireless communication system is provided. The method includes configuring, in an arbitrary slot, an uplink channels including a physical uplink shared channel (PUSCH) and a downlink channels including a physical uplink shared channel (PUSCH) in a predetermined slot, and receiving, from a user equipment (UE), the PUSCH to which uplink control information (UCI) is multiplexed in the slot from a user equipment (UE), wherein a number of coded modulation symbols of the PUSCH is determined based on at least one of frequency resources of the downlink channels or a time from a start point of the slot to an end point of the PUSCH.
In accordance with another aspect of the disclosure to solve the problem, a user equipment (UE) in a wireless communication system is provided. The UE includes a transceiver configured to transmit and receive a signal and a processor coupled with the transceiver, wherein the processor is configured to determine, in a slot including both an uplink channel and a downlink channel, based on at least one of frequency resources of the downlink channel or a time from a start point of the slot to an end point of a physical uplink shared channel (PUSCH) in the uplink channel, a number of coded modulation symbols of uplink control information (UCI) to be multiplexed to the PUSCH, and transmit the PUSCH to which the UCI is multiplexed according to the determined number of coded modulation symbols.
In accordance with another aspect of the disclosure to solve the problem, a base station (BS) in a wireless communication system is provided. The BS includes a transceiver configured to transmit and receive a signal and a processor coupled with the transceiver, wherein the processor is configured to configure, in an arbitrary slot, an uplink channel including a physical uplink shared channel (PUSCH) and a downlink channel, and receive, from a user equipment (UE), the PUSCH to which uplink control information (UCI) is multiplexed in the slot, wherein a number of coded modulation symbols of the PUSCH is determined based on at least one of frequency resources of the downlink channel or a time from a start point of the slot to an end point of the PUSCH.
According to the disclosed embodiments, a rate matching method and apparatus for uplink control information are provided to effectively perform frequency resource allocation during communication in a wireless communication system when communication is performed.
Hereinafter, embodiments of the disclosure will be described in detail with reference to the accompanying drawings.
In describing the embodiments, descriptions related to technical contents well-known in the art and not associated directly with the disclosure will be omitted. Such an omission of unnecessary descriptions is intended to prevent obscuring of the main idea of the disclosure and more clearly transfer the main idea.
For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted, or schematically illustrated. Further, the size of each element does not completely reflect the actual size. In the drawings, identical or corresponding elements are provided with identical reference numerals.
The advantages and features of the disclosure and ways to achieve them will be apparent by making reference to embodiments as described below in detail in conjunction with the accompanying drawings. However, the disclosure is not limited to the embodiments set forth below, but may be implemented in various different forms. The following embodiments are provided only to completely disclose the disclosure and inform those skilled in the art of the scope of the disclosure, and the disclosure is defined only by the scope of the appended claims. Throughout the specification, the same or like reference numerals designate the same or like elements. Furthermore, in describing the disclosure, a detailed description of known functions or configurations incorporated herein will be omitted when it is determined that the description may make the subject matter of the disclosure unnecessarily unclear. The terms which will be described below are terms defined in consideration of the functions in the disclosure, and may be different according to users, intentions of the users, or customs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.
In the following description, a base station is an entity that allocates resources to terminals, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In the disclosure, a “downlink (DL)” refers to a radio link via which a base station transmits a signal to a terminal, and an “uplink (UL)” refers to a radio link via which a terminal transmits a signal to a base station. Furthermore, in the following description, LTE or LTE-A systems may be described by way of example, but the embodiments of the disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. Examples of such communication systems may include 5th generation mobile communication technologies (5G, new radio, and NR) developed beyond LTE-A, and in the following description, the “5G” may be the concept that covers the exiting LTE, LTE-A, or other similar services. In addition, based on determinations by those skilled in the art, the embodiments of the disclosure may also be applied to other communication systems through some modifications without significantly departing from the scope of the disclosure.
Herein, it will be understood that each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks. These computer program instructions may also be stored in a computer usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.
Furthermore, each block of the flowchart illustrations may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the blocks may occur out of the order. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
As used herein, the “unit” refers to a software element or a hardware element, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), which performs a predetermined function. However, the “unit” does not always have a meaning limited to software or hardware. The “unit” may be constructed either to be stored in an addressable storage medium or to execute one or more processors. Therefore, the “unit” includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, properties, procedures, sub-routines, segments of a program code, drivers, firmware, micro-codes, circuits, data, database, data structures, tables, arrays, and parameters. The elements and functions provided by the “unit” may be either combined into a smaller number of elements, or a “unit”, or divided into a larger number of elements, or a “unit”. Moreover, the elements and “units” or may be implemented to reproduce one or more CPUs within a device or a security multimedia card. Furthermore, the “unit” in the embodiments may include one or more processors.
A wireless communication system is advancing to a broadband wireless communication system for providing high-speed and high-quality packet data services using communication standards, such as high-speed packet access (HSPA) of 3GPP, LTE {long-term evolution or evolved universal terrestrial radio access (E-UTRA)}, LTE-Advanced (LTE-A), LTE-Pro, high-rate packet data (HRPD) of 3GPP2, ultra-mobile broadband (UMB), IEEE 802.16e, and the like, as well as typical voice-based services.
As a typical example of the broadband wireless communication system, an LTE system employs an orthogonal frequency division multiplexing (OFDM) scheme in a downlink (DL) and employs a single carrier frequency division multiple access (SC-FDMA) scheme in an uplink (UL). The uplink indicates a radio link through which a user equipment (UE) (or a mobile station (MS)) transmits data or control signals to a base station (BS) (eNode B), and the downlink indicates a radio link through which the base station transmits data or control signals to the UE. The above multiple access scheme may separate data or control information of respective users by allocating and operating time-frequency resources for transmitting the data or control information for each user so as to avoid overlapping each other, that is, so as to establish orthogonality.
Since a 5G communication system, which is a post-LTE communication system, must freely reflect various requirements of users, service providers, and the like, services satisfying various requirements must be supported. The services considered in the 5G communication system include enhanced mobile broadband (eMBB) communication, massive machine-type communication (mMTC), ultra-reliability low-latency communication (URLLC), and the like. eMBB aims at providing a data rate higher than that supported by existing LTE, LTE-A, or LTE-Pro. For example, in the 5G communication system, eMBB must provide a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink for a single base station. Furthermore, the 5G communication system must provide an increased user-perceived data rate to the UE, as well as the maximum data rate. In order to satisfy such requirements, transmission/reception technologies including a further enhanced multi-input multi-output (MIMO) transmission technique are required to be improved. In addition, the data rate required for the 5G communication system may be obtained using a frequency bandwidth more than 20 MHz in a frequency band of 3 to 6 GHz or 6 GHz or more, instead of transmitting signals using a transmission bandwidth up to 20 MHz in a band of 2 GHz used in LTE.
In addition, mMTC is being considered to support application services such as the Internet of Things (IoT) in the 5G communication system. mMTC has requirements, such as support of connection of a large number of UEs in a cell, enhancement coverage of UEs, improved battery time, a reduction in the cost of a UE, and the like, in order to effectively provide the Internet of Things. Since the Internet of Things provides communication functions while being provided to various sensors and various devices, it must support a large number of UEs (e.g., 1,000,000 UEs/km2) in a cell. In addition, the UEs supporting mMTC may require wider coverage than those of other services provided by the 5G communication system because the UEs are likely to be located in a shadow area, such as a basement of a building, which is not covered by the cell due to the nature of the service. The UE supporting mMTC must be configured to be inexpensive, and may require a very long battery life-time such as 10 to 15 years because it is difficult to frequently replace the battery of the UE.
Lastly, URLLC, which is a cellular-based mission-critical wireless communication service, may be used for remote control for robots or machines, industrial automation, unmanned aerial vehicles, remote health care, emergency alert, and the like. Thus, URLLC must provide communication with ultra-low latency and ultra-high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 ms, and also requires a packet error rate of 10-5 or less. Therefore, for the services supporting URLLC, a 5G system must provide a transmit time interval (TTI) shorter than those of other services, and also may require a design for assigning a large number of resources in a frequency band in order to secure reliability of a communication link.
The three 5G services, that is, eMBB, URLLC, and mMTC, may be multiplexed and transmitted in a single system. In this case, different transmission/reception techniques and transmission/reception parameters may be used between services in order to satisfy different requirements of the respective services. Of course, 5G is not limited to the above-described three services.
Hereinafter, a frame structure of the 5G system is described in more detail with reference to the drawings.
Next, a configuration of a bandwidth part (BWP) in the 5G communication system will be described in detail with reference to the drawings.
Referring to
Of course, the configuration for the BWP is not limited to the above example, and various parameters related to the BWP as well as the configuration information may be configured in the UE. The configuration information may be transmitted to the UE by the BS through higher-layer signaling, for example, radio resource control (RRC) signaling. Among one or a plurality of configured BWPs, at least one BWP may be activated. Information indicating whether to activate the configured BWPs may be semi-statically transmitted from the BS to the UE through RRC signaling or may be dynamically transmitted through downlink control information (DCI).
According to an embodiment, the UE before the radio resource control (RRC) connection may receive a configuration of an initial BWP for initial access from the BS through a master information block (MIB). More specifically, the UE may receive configuration information for a control resource set (CORESET) and a search space in which a PDCCH for receiving system information (remaining system information (RMSI) or system information block 1 (SIB1)) required for initial access through the MIB can be transmitted in an initial access step. Each of the CORESET and the search space configured through the MIB may be considered as an identity (ID) 0. The BS may inform the UE of configuration information such as frequency allocation information for control resource set #0, time allocation information, and numerology through the MIB. Further, the BS may inform the UE of configuration information for a monitoring period and an occasion of control resource set #0, that is, configuration information for search space #0 through the MIB. The UE may consider a frequency region configured as control resource set #0 acquired from the MIB as an initial bandwidth part for initial access. At this time, the ID of the initial BWP may be considered as 0.
Configurations for BWPs supported by the 5G wireless communication system may be used for various purposes.
According to an embodiment, when a bandwidth supported by the UE is smaller than a system bandwidth, the configuration for the BWP may be used. For example, the BS may configure a frequency location of the BWP (configuration information 2) in the UE and thus the UE may transmit and receive data at a specific frequency location within the system bandwidth.
Further, according to an embodiment, the BS may configure a plurality of BWPs in the UE to support different numerologies. For example, in order to support all of the data transmission and reception using subcarrier spacing of 15 kHz and subcarrier spacing of 30 kHz in any UE, the BS may configure two BWPs as the subcarrier spacings of 15 kHz and 30 kHz. Different BWPs may be frequency-division-multiplexed, and when the BS desires to transmit and receive data at particular subcarrier spacing, the BWP configured at the corresponding subcarrier spacing may be activated.
Further, according to an embodiment, the BS may configure BWPs having different sizes of bandwidths in the UE to reduce power consumption of the UE. For example, when the UE supports a very large bandwidth, for example, 100 MHz and always transmits and receives data through the corresponding bandwidth, very high power consumption may be generated. Particularly, monitoring an unnecessary downlink control channel through a large bandwidth of 100 MHz in the state in which there is no traffic is very inefficient from the aspect of power consumption. In order to reduce power consumption of the UE, the BS may configure a BWP having a relatively small bandwidth, for example, a BWP of 20 MHz in the UE. The UE may perform a monitoring operation in the BWP of 20 MHz in the state in which there is no traffic, and if data is generated, may transmit and receive data through the BWP of 100 MHz according to an instruction from the BS.
In a method of configuring the BWP, UEs before the RRC connection may receive configuration information for an initial BWP through a master information block (MIB) in an initial access operation. More specifically, the UE may receive a configuration of a control resource set (CORESET) for a downlink control channel in which downlink control information (DCI) for scheduling a system information block (SIB) can be transmitted from an MIB of a physical broadcast channel (PBCH). A bandwidth of the CORESET configured by the MIB may be considered as an initial downlink BWP, and the UE may receive a physical downlink shared channel (PDSCH), in which the SIB is transmitted, through the configured initial BWP. The initial bandwidth part may be used not only for receiving the SIB but also other system information (OSI), paging, or random access.
When one or more BWPs are configured in the UE, the BS may instruct the terminal to change the BWPs through a BWP indicator field within the DCI. For example, when a currently activated BWP of the terminal is BWP #1 301 in
As described above, since the DCI-based BWP change may be indicated by the DCI for scheduling the PDSCH or the PUSCH, the UE should be able to receive or transmit the PDSCH or the PUSCH scheduled by the corresponding DCI in the changed BWP without any difficulty if the UE receives a BWP change request. To this end, the standard has prescribed requirements for a delay time (TBWP) required for the BWP change, which may be defined as shown in, for example, [Table 2] below.
The requirements for the BWP change delay time may support type 1 or type 2 according to a UE capability. The UE may report a supportable BWP delay time type to the BS.
When the UE receives DCI including a BWP change indicator in slot n according to the requirements for the BWP change delay time, the UE may complete a change to a new BWP indicated by the BWP change indicator at a time point that is not later than slot n+TBWP and transmit and receive a data channel scheduled by the corresponding DCI in the changed new BWP. When the BS desires to schedule a data channel in the new BWP, the BS may determine allocation of time domain resources for the data channel in consideration of the BWP change delay time TBWP of the UE. That is, when scheduling the data channel in the new BWP, the BS may schedule the corresponding data channel after the BWP change delay time through a method of determining allocation of time domain resources for the data channel. Accordingly, the UE may not expect that the DCI indicating the BWP change indicates a slot offset (K0 or K2) smaller than the BWP change delay time (TBWP).
If the UE receives DCI (for example, DCI format 1_1 or 0_1) indicating the BWP change, the UE may perform no transmission or reception during a time interval corresponding to symbols from a third symbol of a slot for receiving the PDCCH including the corresponding DCI to a start point of the slot indicated by the slot offset (K0 or K2) indicated by a time domain resource allocation field within the corresponding DCI. For example, when the UE receives DCI indicating the BWP change in slot n and a slot offset value indicated by the corresponding DCI is K, the terminal may perform no transmission or reception from the third symbol of slot n to a symbol before slot n+K (that is, the last symbol of slot n+K−1).
Subsequently, a synchronization signal (SS)/PBCH block in 5G wireless communication system is described.
The SS/PBCH block may be a physical layer channel block including a primary SS (PSS), a secondary SS (SSS), and a PBCH. It may be described below in more detail.
The UE may detect the PSS and the SSS in an initial access operation and decode the PBCH. The UE may acquire an MIB from the PBCH and receive a configuration of control resource set (CORESET) #0 (corresponding to a control resource set having control resource set index 0) therefrom. The UE may monitor CORESET #0 on the basis of the assumption that the selected SS/PBCH block and a demodulation reference signal (DMRS) transmitted in CORESET #0 are Quasi Co-Located (QCL). The UE may receive system information through downlink control information transmitted in CORESET #0. The UE may acquire configuration information related to a random access channel (RACH) required for initial access from the received system information. The UE may transmit a physical RACH (PRACH) to the BS in consideration of the selected SS/PBCH index, and the BS receiving the PRACH may acquire information on the SS/PBCH block index selected by the UE. The BS may know which block is selected by the UE from among the SS/PBCH blocks and that CORESET #0 related thereto is monitored.
Subsequently, downlink control information (DCI) in the 5G wireless communication system will be described in detail.
In the 5G system, scheduling information for uplink data (or a physical uplink data channel (physical uplink shared channel (PUSCH)) or downlink data (or physical downlink data channel (physical downlink shared channel (PDSCH)) may be transmitted from the BS to the UE through DCI. The UE may monitor a fallback DCI format and a non-fallback DCI format for the PUSCH or the PDSCH. The fallback DCI format may include a fixed field predefined between the BS and the UE, and the non-fallback DCI format may include a configurable field.
The DCI may be transmitted through a physical downlink control channel (PDCCH) after passing through a channel coding and modulation process. A cyclic redundancy check (CRC) is added to a DCI message payload and is scrambled by a radio network temporary identifier (RNTI) corresponding to the identity of the UE. Depending on the purpose of the DCI message, for example, UE-specific data transmission, a power control command, a random access response, or the like, different RNTIs may be used. That is, the RNTI is not explicitly transmitted but is included in a CRC calculation process to be transmitted. If the DCI message transmitted through the PDCCH is received, the UE may identify the CRC through the allocated RNTI, and may recognize that the corresponding message is transmitted to the UE when the CRC is determined to be correct on the basis of the CRC identification result.
For example, DCI for scheduling a PDSCH for system information (SI) may be scrambled by an SI-RNTI. DCI scheduling a PDSCH for a random access response (RAR) message may be scrambled by an RA-RNTI. DCI scheduling a PDSCH for a paging message may be scrambled by a P-RNTI. DCI notifying of a slot format indicator (SFI) may be scrambled by an SFI-RNTI. DCI notifying of transmit power control (TPC) may be scrambled by a TPC-RNTI. DCI for scheduling a UE-specific PDSCH or PSCH may be scrambled by a cell RNTI (C-RNTI), a modulation coding scheme (MCS)-C-RNTI, or a configured scheduling (CS)-RNTI.
DCI format 0_0 may be used for fallback DCI for scheduling a PUSCH in which case the CRC may be scrambled by a C-RNTI. DCI format 0_0 in which the CRC is scrambled by the C-RNTI may include, for example, the following information.
DCI format 0_1 may be used for non-fallback DCI for scheduling a PUSCH in which case the CRC may be scrambled with a C-RNTI. DCI format 0_1 in which the CRC is scrambled by the C-RNTI may include, for example, the following information.
DCI format 1_0 may be used for fallback DCI for scheduling a PDSCH in which case the CRC may be scrambled with a C-RNTI. DCI format 1_0 in which the CRC is scrambled by the C-RNTI may include, for example, the following information.
DCI format 1_1 may be used for non-fallback DCI for scheduling a PDSCH in which case the CRC may be scrambled by a C-RNTI. DCI format 1_1 in which the CRC is scrambled by the C-RNTI may include, for example, the following information.
Hereinafter, a method of allocating time domain resources for data channels in the 5G wireless communication system will be described.
The BS may configure a table for time domain resource allocation information for a downlink data channel (physical downlink shared channel (PDSCH)) and an uplink data channel (physical uplink shared channel (PUSCH)) in the UE through higher-layer signaling (for example, RRC signaling). A table including a maximum of maxNrofDL-Allocations=16 entries may be configured for the PDSCH, and a table including a maximum of maxNrofUL-Allocations=16 entries may be configured for the PUSCH. The time domain resource allocation information may include, for example, PDCCH-to-PDSCH slot timing (corresponding to a time interval in units of slots between a time point at which a PDCCH is received and a time point at which a PDSCH scheduled by the received PDCCH is transmitted, and indicated by K0) or PDCCH-to-PUSCH slot timing (corresponding to a time interval in units of slots between a time point at which a PDCCH is received and a time point at which a PUSCH scheduled by the received PDCCH is transmitted, and indicated by K2), information on a location and a length of a start symbol in which a PDSCH or a PUSCH is scheduled within the slot, a mapping type of a PDSCH or a PUSCH, and the like. For example, information shown in [Table 8] and [Table 9] below may be notified to the UE by the BS.
The BS may inform the UE of one of the entries in the table for the time domain resource allocation information through L1 signaling (for example, DCI) (for example, indicated through a ‘time domain resource allocation field within DCI). The UE may acquire time domain resource allocation information for a PDSCH or a PUSCH on the basis of the DCI received from the BS.
Hereinafter, a method of allocating frequency domain resources for data channels in the 5G wireless communication system will be described.
In the 5G wireless communication system, two types, such as resource allocation type 0 and resource allocation type 1, are supported as a method of indicating frequency domain resource allocation information for a downlink data channel (physical downlink shared channel (PDSCH) and an uplink data channel (physical uplink shared channel (PUSCH)).
A total number NRBG of RBGs of a BWP i having the size of NBWP,isize may be defined as below.
N
RBG=┌(NBWP,isize+(NBWP,istart mod P))/P┌, where
The BS may configure a resource allocation type in the UE through higher-layer signaling (for example, a higher-layer parameter resourceAllocation may be configured as one value among resourceAllocationType0, resourceAllocationType1, or dynamicSwitch). If the UE receives a configuration of both types 0 and 1 (or if the higher-layer parameter resourceAllocation is equally configured as dynamicSwitch), the BS may show whether a bit corresponding to the most significant bit (MSB) of the field indicating resource allocation within the DCI format indicating scheduling is resource allocation type 0 or resource allocation type 1. Further, resource allocation information may be indicated through the remaining bits except for the bit corresponding to the MSB, based on the indicated resource allocation type, and the UE may analyze resource allocation field information of the DCI field, based thereon. If the UE receives a configuration of one of resource allocation type 0 or resource allocation type 1 (or if the higher-layer parameter resourceAllocation is configured as one value among resourceAllocationType0 or resourceAllocationType1), resource allocation information may be indicated based on a field indicating resource allocation within the DCI format indicating scheduling and the UE may analyze resource allocation field information of the DCI field, based thereon.
Hereinafter, a modulation and coding scheme (MCS) used in the 5G wireless communication system will be described in detail.
In 5G, a plurality of MCS index tables are defined for PDSCH and PUSCH scheduling. An MCS table assumed by the UE among the plurality of MCS tables may be configured or indicated to the UE through higher-layer signaling or L1 signaling or through an RNTI value assumed by the UE during PDCCH decoding.
MCS index table 1 for a PDSCH and a CP-OFDM-based PUSCH (or PUSCH without transform precoding) may be as shown in [Table 11] below.
MCS index table 2 for a PDSCH and a CP-OFDM-based PUSCH (or PUSCH without transform precoding) may be as shown in [Table 12] below.
MCS index table 3 for a PDSCH and a CP-OFDM-based PUSCH (or PUSCH without transform precoding) may be as shown in [Table 13] below.
MCS index table 1 for a DFT-s-OFDM-based PUSCH (or PUSCH with transform precoding) may be as shown in [Table 14] below.
MCS index table 2 for a DFT-s-OFDM-based PUSCH (or PUSCH with transform precoding) may be as shown in [Table 15] below.
An MCS index table for a PUSCH to which transform precoding (or discrete Fourier transform (DFT) precoding) and 64 QAM are applied may be as shown in [Table 16] below.
An MCS index table for a PUSCH to which transform precoding (or discrete Fourier transform (DFT) precoding) and 64 QAM are applied may be as shown in [Table 17] below.
Hereinafter, a downlink control channel in the 5G wireless communication system will be described in more detail with reference to the drawings.
Referring to
The CORESET in the 5G wireless communication system may be configured in the UE by the BS through higher-layer signaling (for example, system information, a master information block (MIB), or radio resource control (RRC) signaling). Configuring the CORESET in the UE may mean providing information such as an identity of the CORESET, a frequency location of the CORESET, a symbol length of the CORESET, and the like. For example, the following information may be included.
In [Table 18], tci-StatesPDCCH (simply, referred to as a transmission configuration indication (TCI) state) configuration information may include information on one or a plurality of synchronization signal (SS)/physical broadcast channel (PBCH) block indexes or channel state information reference signal (CSI-RS) indexes having the quasi co-located (QCL) relationship with a demodulation reference signal (DMRS) transmitted in the corresponding CORESET.
That is,
Referring to
As illustrated in
The basic unit of the downlink control channel illustrated in
The search spaces may be classified into a common search space and a UE-specific search space. UEs in a predetermined group or all UEs may search for a common search space of the PDCCH in order to receive cell-common control information such as dynamic scheduling for system information or paging messages. For example, PDSCH scheduling allocation information for transmission of an SIB including information on a service provider of a cell may be received by searching for a common-search space of the PDCCH. In the case of the common search space, UEs in a predetermined group or all UEs should receive the PDCCH, so that the common-search space may be defined as a set of pre-arranged CCEs. Scheduling allocation information for the UE-specific PDSCH or PUSCH may be received by searching for a UE-specific search space of the PDCCH. The UE-specific search space may be UE-specifically defined as a UE identity and a function of various system parameters.
In the 5G wireless communication system, parameters for the search space of the PDCCH may be configured in the UE by the BS through higher-layer signaling (for example, SIB, MIB, or RRC signaling). For example, the BS may configure, in the UE, the number of PDCCH candidates at each aggregation level L, a monitoring period of the search space, a monitoring occasion in units of symbols within the slot for the search space, a search space type, that is, a common search space or a terminal-specific search space, a combination of a DCI format and an RNTI to be monitored in the corresponding search space, and a control resource set index for monitoring the search space. For example, the parameters for the PDCCH search space may include the following information.
The BS may configure one or a plurality of search space sets in the UE according to configuration information. According to an embodiment, the BS may configure search space set 1 and search space set 2 in the terminal, and the configuration may be performed such that DCI format A scrambled by an X-RNTI in search space set 1 is monitored in the common-search space and DCI format B scrambled by a Y-RNTI in search space set 2 is monitored in the terminal-specific search space.
According to configuration information, one or a plurality of search space sets may exist in the common search space or the UE-specific search space. For example, search space set #1 and search space set #2 may be configured as common search spaces, and search space set #3 and search space set #4 may be configured as UE-specific search spaces.
In the common search space, the following combinations of DCI formats and RNTIs may be monitored. Of course, the disclosure is not limited to the following examples.
In the UE-specific search space, the following combinations of DCI formats and RNTIs may be monitored. Of course, the disclosure is not limited to the following examples.
The described RNTIs may follow the following definition and use.
The DCI formats may follow definitions below.
In the 5G wireless communication system, a control resource set p and a search space at an aggregation level L in a search space set s may be expressed as shown in the following equation.
A value of Y_(p,nμs,f) may correspond to 0 in the case of the common search space.
A value of Y_(p,nμs,f) may correspond to a value varying depending on a UE identity (a C-RNTI or an ID configured in the UE by the BS) and a time index in the case of the UE-specific search space.
Referring to
Second, through user-specific configuration information through dedicated higher-layer signaling, a flexible slot or a slot 621 or 622 including a flexible symbol may be indicated by the number 623 or 625 of consecutive downlink symbols from the start symbol of each slot and the number 624 or 626 of consecutive uplink symbols from the end of the slot, or may be totally indicated by the downlink or the uplink.
Last, in order to dynamically change a downlink signal transmission section and an uplink signal transmission section, whether each of the symbols indicated as the flexible symbols (that is, symbols which are not indicated by the downlink or the uplink) in each slot is a downlink symbol, an uplink symbol, or a flexible symbol may be indicated through a slot format indicator (SFI) 631 or 632 included in the downlink control channel. The slot format indicator may be selected as one index in a table in which the uplink-downlink configuration of 14 symbols within one slot is preset as shown in [Table 21] below.
In the 5G mobile communication service, additional coverage expansion technology compared to the LTE communication service has been introduced, but a TDD system suitable for a service having substantially high percentage of downlink traffic may be actually used in the 5G mobile communication service. Further, as the center frequency becomes higher to increase a frequency band, the coverage of the BS and the UE decreases, and thus coverage enhancement is a key requirement of the 5G mobile communication service. Particularly, the coverage enhancement of an uplink channel is a key requirement of the 5G mobile communication service in order to support a service having transmission power of the UE lower than transmission power of the BS and having large downlink traffic and because a ratio of the downlink is higher than that of the uplink in the time domain. Physically, methods of enhancing the coverage of the uplink channels of the BS and the UE may include a method of increasing time resources of the uplink channels, reducing the center frequency, or increasing transmission power of the UE. However, a change in the frequency may have restrictions since a frequency band is determined for each network operator. Further, maximum transmission power of the UE is restrictively determined to reduce interference, and thus there may be restrictions on the increase of maximum transmission power of the UE to enhance the coverage.
Accordingly, in order to enhance the coverage of the BS and the UE, uplink and downlink resources in the time domain may be separated according to percentage of uplink and downlink traffic like in the TDD system, and also uplink and downlink resources may be separated in the frequency domain like in the FDD system. In an embodiment, a system in which uplink resources and downlink resources can be flexible separated in the time domain and the frequency domain may be referred to as an XDD system, a flexible TDD system, a hybrid TDD system, a TDD-FDD system, a hybrid TDD-FDD system, or the like, and may be described as an XDD system in the disclosure for convenience of description. According to an embodiment, in XDD, X may be time or frequency.
Referring to
According to an embodiment illustrated in
In the embodiment of
In another example of
In another example of
The transmission and reception structure illustrated in
According to the transmission and reception structure illustrated in
According to the transmission and reception structure illustrated in
Power amplifier coupler 916: a block to observe a waveform of an analog transmission signal passing through a power amplifier by a reception side.
Constant update block 917: updates various constants required for digital domain signal processing by a transmission side and a reception side, the calculated constant being used for setting various parameters in a block of DPD 911 of the transmission side and a block of SIC 921 of the reception side
The transmission and reception structure illustrated in
In an embodiment of the disclosure, self interference between a transmission signal (or a downlink signal) and a reception signal (or an uplink signal) may be generated in a system in which transmission and reception can be simultaneously performed.
For example, in the XDD system, self interference may be generated.
In the case of XDD, resources of a downlink 1000 and resources of an uplink 1003 may be separated in the frequency domain, in which case a guard band (GB) 1004 may exist between the resources of the downlink 1000 and the resources of the uplink 1001. Downlink transmission may be actually performed within a downlink bandwidth 1002, and uplink transmission may be actually performed within an uplink bandwidth 1003. At this time, leakage 1006 to the outside of the uplink or downlink transmission band may be generated. Interference (named adjacent carrier leakage (ACL)) 1005 due to the leakage may be generated in an area adjacent to the downlink resources 1000 and the uplink resources 1001.
In this example, only for UEs which do not support full duplex in which uplink/downlink transmission and reception are simultaneously possible in the same time frequency resources, the BS is required to separate downlink resources and uplink resources of the UE 1110 receiving the downlink and the UE 1105 transmitting the uplink at a specific time (for example, second to fourth time sections of
Meanwhile, the BS and UE operations may be ambiguous in resources 1210 which are included in the activated DL BWP or UL BWP in the above example but are not actually allocated for the PDSCH or PUSCH XDD operation. For example, in the case of a CSI-RS for tracking (TRS), a smaller value between 52 RBs and a BWP bandwidth for transmitting the corresponding TRS is used as a transmission bandwidth, and thus there is a risk that the UE 1225 operating in an activated DL BWP including an XDD uplink band of another UE will think TRS is transmitted in the area 1210 to which the downlink resources, such as a PDSCH, are not allocated for the XDD operation. Similarly, there is a risk that the UE 1235 operating in the activated UL BWP including an XDD downlink band of another UE will think a periodic or semi-persistent uplink channel or signal, such as an SRS or a PUCCH, is transmitted in the area 1210 in which the downlink resources, such as the PUSCH, are not allocated for the XDD operation.
Subsequently, a scheduling scheme of PUSCH transmission is described. PUSCH transmission may be dynamically scheduled by a UL grant within DCI or may operate by configured grant Type 1 or Type 2. Dynamic scheduling of PUSCH transmission can be indicated by DCI format 0_0 or 0_1.
Configured grant Type 1 PUSCH transmission may be semi-statically configured through reception of configuredGrantConfig including rrc-ConfiguredUplinkGrant in [Table 22] through higher-layer signaling without reception of a UL grant within DCI. Configured grant Type 2 PUSCH transmission may be semi-persistently scheduled by a UL grant within DCI after reception of configuredGrantConfig which does not include rrc-ConfiguredUplinkGrant in [Table 22] through higher-layer signaling. When PUSCH transmission operates by a configured grant, parameters applied to PUSCH transmission may be applied through configuredGrantConfig of [Table 22] which is received through higher-layer signaling except for dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH provided as pusch-Config of [Table 23] which is higher-layer signaling. When the UE receives transformPrecoder within configuredGrantConfig of [Table 22] which is higher-layer signaling, the UE applies tp-pi2BPSK within pusch-Config of [Table 23] to PUSCH transmission operating by the configured grant.
Subsequently, a PUSCH transmission method is described. A DMRS antenna port for PUSCH transmission is the same as an antenna port for SRS transmission. PUSCH transmission may follow each of a codebook-based transmission method and a non-codebook-based transmission method according to whether a value of txConfig within pusch-Config of [Table 23] which is higher-layer signaling is ‘codebook’ or ‘nonCodebook’.
As described above, PUSCH transmission may be dynamically scheduled through DCI format 0_0 or 0_1 or semi-statically configured by the configured grant. When the UE receives an indication of scheduling of PUSCH transmission through DCI format 0_0, the UE performs a beam configuration for PUSCH transmission by using pucch-spatialRelationInfoID corresponding to a UE-specific PUCCH resource corresponding to a minimum ID within the activated uplink BWP in the serving cell in which case the PUSCH transmission is based on a single antenna port. The UE does not expect scheduling of PUSCH transmission through DCI format 0_0 within a BWP in which the PUCCH resource including pucch-spatialRelationInfo is not configured. When the UE does not receive a configuration of txConfig within pusch-Config of [Table 23], the UE does not expect reception of scheduling through DCI format 0_1.
Subsequently, codebook-based PUSCH transmission is described. Codebook-based PUSCH transmission may be dynamically scheduled through DCI format 0_0 or 0_1 or semi-statically operate by the configured grant. When codebook-based PUSCH is dynamically scheduled by DCI format 0_1 or is semi-statically configured by the configured grant, the UE determines a precoder for PUSCH transmission on the basis of an SRS resource indicator (SRI), a transmission precoding matrix indicator (TPMI), and a transmission rank (the number of PUSCH transmission layers).
At this time, the SRI may be given through an SRS resource indicator field within DCI or may be configured through srs-ResourceIndicator which is higher-layer signaling. In codebook-based PUSCH transmission, the UE may receive a configuration of at least one SRS resource and a maximum of two SRS resources. When the UE receives the SRI through DCI, the SRS resource indicated by the corresponding SRI is the SRS resource corresponding to the SRI among SRS resources transmitted earlier than the PDCCH including the corresponding SRI. Further, the TPMI and the transmission rank may be given through field information and number of layers within DCI or may be configured through precodingAndNumberOfLayers which is higher-layer signaling. The TPMI is used to indicate a precoder applied to PUSCH transmission. When the UE receives a configuration of one SRS resource, the TPMI is used to indicate a precoder to be applied to the one configured SRS resource. When the UE received a configuration of a plurality of SRS resources, the TPMI is used to indicate a precoder to be applied to SRS resources indicated through the SRI.
The precoder to be used for PUSCH transmission is selected from an uplink codebook having the number of antenna ports which is the same as a value of nrofSRS-Ports within SRS-Config which is higher-layer signaling. In codebook-based PUSCH transmission, the UE determines a codebook subset on the basis of the TPMI and a codebookSubset within pusch-Config which is higher-layer signaling. The codebookSubset within pusch-Config which is higher-layer signaling may be configured as one of ‘fully AndPartialAndNonCoherent’, ‘partialAndNonCoherent’, or ‘nonCoherent’ on the basis of the UE capability which the UE reports to the BS. When the UE reports ‘partial AndNonCoherent’ as the UE capability, the UE does not expect a configuration of the value of the codebookSubset which is higher-layer signaling as ‘fully AndPartialAndNonCoherent’. Further, when the UE reports ‘nonCoherent’ as the UE capability, the UE does not expect a configuration of the value of the codebook Subset which is higher-layer signaling as ‘fully AndPartialAndNonCoherent’ or ‘partial AndNonCoherent’. When nrofSRS-Ports within SRS-ResourceSet which is higher-layer signaling indicate two SRS antenna ports, the UE does not expect a configuration of the value of the codebookSubset which is higher-layer signaling as ‘partial AndNonCoherent’.
The UE may receive a configuration of one SRS resource set having a value of usage within SRS-ResourceSet which is higher-layer signaling configured as ‘codebook’, and one SRS resource may be indicated through the SRI within the corresponding SRS resource set. When several SRS resources are configured within the SRS resource set having the value of usage within SRS-ResourceSet which is higher-layer signaling configured as ‘codebook’, the UE expects a configuration of the same value of nrofSRS-Ports within the SRS-Resource which is higher-layer signaling for all SRS resources.
The UE may transmit one or a plurality of SRS resources included in the SRS resource set having the value of usage configured as ‘codebook’ to the BS according to higher-layer signaling, and the BS may select one of the SRS resources transmitted by the UE and instruct the UE to perform PUSCH transmission by using transmission beam information of the corresponding SRS resource. At this time, in codebook-based PUSCH transmission, the SRI may be used as information for selecting an index of one SRS resource and may be included in DCI. In addition, the BS may insert information indicating the TPMI and the rank to be used for PUSCH transmission by the UE into DCI. The UE performs PUSCH transmission by applying a precoder indicated by the rank and the TPMI indicated on the basis of the transmission beam of the corresponding SRS resource using the SRS resource indicated by the SRI.
Subsequently, non-codebook-based PUSCH transmission is described. Non-codebook-based PUSCH transmission may be dynamically scheduled through DCI format 0_0 or 0_1 or semi-statically operate by the configured grant. When at least one SRS resource is configured within the SRS resource set having the value of usage configured as ‘nonCodebook’ within SRS-ResourceSet which is higher-layer signaling, the UE may receive scheduling of non-codebook-based PUSCH transmission through DCI format 0_1.
Through higher-layer signaling, the UE may receive a configuration of one non-zero power CSI-RS (NZP CSI-RS) resource connected to the SRS resource set having the value of usage within SRS-ResourceSet configured as ‘nonCodebook’. The UE may calculate a precoder for SRS transmission through measurement for the NZP CSI-RS resource connected to the SRS resource set. When a difference between the last reception symbol of the aperiodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of aperiodic SRS transmission in the UE is smaller than 42 symbols, the UE does not expect an update of information on the precoder for SRS transmission.
When the value of resource Type within SRS-ResourceSet which is higher-layer signaling is configured as ‘aperiodic’, the connected NZP CSI-RS is indicated by an SRS request which is a field within DCI format 0_1 or 1_1. At this time, when the connected NZP CSI-RS resource is an aperiodic NZP CSI-RS resource and the value of the SRS request field within DCI format 0_1 or 1_1 is not ‘00’, it may indicate the existence of the NZP CSI-RS connected to the SRS resource set. At this time, the corresponding DCI should not indicate cross carrier or cross BWP scheduling. Further, when the value of the SRS request indicates the existence of the NZP CSI-RS, the corresponding NZP CSI-RS is located in a slot in which the PDCCH including the SRS request field is transmitted. At this time, TCI states configured in the scheduled subcarrier are not configured as QCL-TypeD.
If the periodic or semi-persistent SRS resource set is configured, the connected NZP CSI-RS may be indicated through an associatedCSI-RS within SRS-ResourceSet which is higher-layer signaling. For non-codebook-based transmission, the UE does not expect configurations of both spatialRelationInfo which is higher layer signaling for the SRS resource and associatedCSI-RS within SRS-ResourceSet which is higher-layer signaling.
When the UE receives a configuration of a plurality of SRS resources, the UE may determine a precoder and a transmission rank to be applied to PUSCH transmission on the basis of an SRI indicated by the BS. At this time, the SRI may be indicated through an SRS resource indicator field within DCI or may be configured through srs-ResourceIndicator which is higher-layer signaling. Like the codebook-based PUSCH transmission, when the UE receives the SRI through DCI, the SRS resource indicated by the corresponding SRI is the SRS resource corresponding to the SRI among SRS resources transmitted earlier than the PDCCH including the corresponding SRI. The UE may use one or a plurality of SRS resources for SRS transmission, and the maximum number of SRS resources which can be simultaneously transmitted in the same symbol within one SRS resource set and the maximum number of SRS resources are determined by the UE capability which the UE reports to the BS. At this time, SRS resources which the UE simultaneously transmits occupy the same RB. The UE configures one SRS port for each SRS resource. The number of SRS resource sets having the value of usage configured as ‘nonCodebook’ within SRS-ResourceSet which is higher-layer signaling is only one, and the maximum number of SRS resources for non-codebook-based PUSCH transmission can be 4.
The BS transmits one NZP-CSI-RS connected to the SRS resource set, and the UE calculates a precoder to be used for one or a plurality of SRS resource transmissions within the corresponding SRS resource set on the basis of the measurement result when the corresponding NZP-CSI-RS is received. When transmitting one or a plurality of SRS resources within the SRS resource set having usage configured as ‘nonCodebook’ to the BS, the UE applies the calculated precoder and the BS selects one or a plurality of SRS resources from among the one or plurality of received SRS resources. At this time, in non-codebook-based PUSCH transmission, the SRI indicates an index which may express one SRS resource or a combination of a plurality of SRS resources, and the SRI is included in the DCI. The number of SRS resources indicated by the SRI transmitted by the BS may be the number of transmission layers of the PUSCH, and the UE transmits the PUSCH by applying the precoder applied to SRS resources to each layer.
Subsequently, a PUSCH preparation procedure time (PUSCH preparation procedure time) is described. When the BS schedules the UE to transmit a PUSCH by using DCI format 0_0 or DCI format 0_1, the UE may need a PUSCH preparation procedure time for transmitting a PUSCH by applying a transmission method (a transmission precoding method of SRS resources, the number of transmission layers, and a spatial domain transmission filter) indicated through DCI. In NR, a PUSCH preparation procedure time considering the same is defined. The PUSCH preparation procedure time of the UE may follow [Equation 2] below.
In Tproc,2 described above, each parameter may have the following meaning.
In consideration of time axis resource mapping information of the PUSCH scheduled through DCI and an effect of uplink-downlink timing advance (TA), the BS and the UE may determine that the PUSCH preparation procedure time is not sufficient when a first symbol of the PUSCH starts earlier than a first uplink symbol at which the CP starts after Tproc,2 from a last symbol of the PDCCH including the DCI scheduling the PUSCH. Otherwise, the BS and the UE determine that the PUSCH preparation procedure time is sufficient. The UE may transmit the PUSCH only when the PUSCH preparation procedure time is sufficient, and may ignore the DCI scheduling the PUSCH when the PUSCH preparation procedure time is not sufficient.
Subsequently, PUSCH repetitive transmission is described. When the UE receives scheduling of PUSCH transmission in DCI format 0_1 within the PDCCH including CRC scrambled by a C-RNTI, an MCS-C-RNTI, or a CS-RNTI, if the UE receives a configuration of pusch-AggregationFactor which is higher-layer signaling, the same symbol allocation is applied in successive slots of pusch-AggregationFactor and PUSCH transmission is limited to single rank transmission. For example, the UE should repeat the same TB in successive slots of pusch-AggregationFactor and apply the same symbol allocation for each slot. [Table 26] shows a redundancy version applied to PUSCH repetitive transmission for each slot. When the UE receives scheduling of PUSCH repetitive transmission in a plurality of slots by DCI format 0_1 and at least one symbol in slots for PUSCH repetitive transmission is indicated as downlink symbols according to information on tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated which is higher-layer signaling, the UE does not perform PUSCH transmission in the slot in which the corresponding symbol is located.
Hereinafter, repetitive transmission of an uplink data channel in a 5G system is described in detail. In the 5G system, two types such as a PUSCH repetitive transmission type A and a PUSCH repetitive transmission type B are supported as the repetitive transmission method of the uplink data channel. The UE may receive a configuration of one of PUSCH repetitive transmission type A or B through higher-layer signaling.
and a symbol starting at the slot is given by mod(S+n·L,Nsymbslot). A slot at which nth nominal repetition ends is given by
and a symbol ending at the slot is given by mod(S+(n+1)·L−1, Nsymbslot). Here, n=0, . . . , numberofrepetitions−1, S is a start symbol of a configured uplink data channel, and L is the symbol length of the configured uplink data channel. Ks denotes a slot at which h PUSCH transmission starts, and Nsymbslot denotes the number of symbols per slot.
1. A symbol configured as the downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated is determined as an invalid symbol for the PUSCH repetitive transmission type B.
2. Symbols indicated by ssb-PositionsInBurst within SIB1 or ssb-PositionsInBurst within ServingCellConfigCommon which is higher-layer signaling for SSB reception in unpaired spectrum (TDD spectrum) may be determined as invalid symbols for the PUSCH repetitive transmission type B.
3. In order to transmit a control resources set connected to a Type0-PDCCH CSS set in the unpaired spectrum (TDD spectrum), symbols indicated through pdcch-ConfigSIB1 within the MIB may be determined as invalid symbols for the PUSCH repetitive transmission type B.
4. When numberOfInvalidSymbolsForDL-UL-Switching which is higher-layer signaling is configured in the unpaired spectrum (TDD spectrum), symbols corresponding to numberOfInvalidSymbolsForDL-UL-Switching from the symbols configured as the downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated may be determined as invalid symbols.
After the invalid symbol is determined, for each nominal repetition, the UE may consider symbols except for the invalid symbol as valid symbols. When one or more valid symbols are included in each nominal repetition, the nominal repetition may include one or more actual repetitions. Each actual repetition includes successive sets of valid symbols which can be used for the PUSCH repetitive transmissions type B in one slot. When the OFDM symbol length of the nominal repetition is not 1 and the length of actual repetition is 1, the UE may ignore transmission for the corresponding actual repetition.
Further, for PUSCH repetitive transmission, the following additional methods may be defined for UL grant-based PUSCH transmission and configured grant-based PUSCH transmission beyond the slot boundary in NR Release 16.
Hereinafter, rate matching for uplink control information (UCI) in the 5G system is described in detail. Prior to the description of the rate matching for UCI, the case in which the UCI is multiplexed to the PUSCH is described. When the PUCCH and the PUSCH overlap and a timeline condition for UCI multiplexing is satisfied, the UE may multiplex HARQ-ACK included in the PUCCH and/or CSI information to the PUSCH according to the UCI information included in the PUSCH and may not transmit the PUCCH. At this time, the timeline condition for UCI multiplexing may refer to 3GPP standard TS 38.213 clause 9.2.5. As one example of the timeline condition for UCI multiplexing, when one of PUCCH transmission or PUSCH transmission is scheduled through DCI, the UE may perform UCI multiplexing only when the first symbol S0 of the earliest PUCCH or PUSCH among the PUCCHs and PUSCHs overlapping the slot should satisfy the following condition.
These are parts of the timeline condition for UCI multiplexing, and the UE may perform UCI multiplexing for the PUSCH when all conditions are satisfied with reference to 3GPP standard TS 38.213 clause 9.2.5.
When the PUCCH and the PUSCH overlap, the timeline condition for UCI multiplexing is satisfied, and the UE determines to multiplex UCI included in the PUCCH to the PUSCH, the UE performs UCI rate matching for UCI multiplexing. The UCI multiplexing is performed in the order of HARQ-ACI, configured grant uplink control information (CG-UCI), CSI part 1, and CSI part 2. The UE performs rate matching in consideration of the order of UCI multiplexing. Accordingly, the UE calculates coded modulation symbols per layer for HARQ-ACK and CG-UCI and calculates coded modulation symbols per layer of CSI part 1 in consideration thereof. Thereafter, the UE calculates coded modulation symbols per layer of CSI part 2 in consideration of the coded modulation symbols per layer for HARQ-ACK, CG-UCI, and CSI part 1.
When rate matching is performed according to each UCI type, a method of calculating the number of coded modulation symbols per layer varies depending on a repetitive transmission type of the PUSCH to which UCI is multiplexed and whether uplink data (uplink shared channel (UL-SCH) is included. For example, when rate matching for HARQ-ACK is performed, equations of calculating coded modulation symbols per layer according to the PUSCH to which UCI is multiplexed are the following equations.
[Equation 3] is an equation of calculating coded modulation symbols per layer for HARQ-ACK multiplexed to the PUSCH in the case of non-PUSCH repetitive transmission type B including the UL-SCH, and [Equation 4] is an equation of calculating coded modulation symbols per layer for HARQ-ACK multiplexed to the PUSCH repetitive transmission type B including the UL-SCH. [Equation 5] is an equation of calculating coded modulation symbols per layer for HARQ-ACK multiplexed to the PUSCH which does not include the UL-SCH. In [Equation 3], OACK is the number of HARQ-ACK bits. LACK is the number of CRC bits for HARQ-ACK. βoffsetPUSCH is a beta offset for HARQ-ACK and corresponds to βoffsetHARQ-ACK. CUL-SCH is the number of code blocks of the UL-SCH for PUSCH transmission, and Kr is a code block size of an rth code block. MscUCI(l) is the number of resource elements which can be used by a symbol l for UCI transmission and is determined according to whether there is a DMRS and a PTRS of the symbol l. When the DMRS is included in the symbol l, MSCUCI(l)=0 For the symbol l which does not include the DMRS, MscUCI(l)=MscPUSCH−MscPT-RS(l) MscPUSCH is the number of subcarriers for a bandwidth in which PUSHC transmission is scheduled, and MscPT-RS(l) is the number of subcarriers including the PTRS within the symbol l. Nsymb,allPUSCH is the total number of symbols of the PUSCH. α is higher-layer parameter scaling, and corresponds to a ratio of resources to which UCI can be multiplexed to resources for the entire PUSCH transmission. l0 is an index of a first symbol including no DMRS after a first DMRS. In [Equation 4], Msc,nominalUCI(l) is the number of resource elements which can be used for UCI transmission for nominal repetition, and is 0 for a symbol including a DMRS and Msc,nominalUCI(l)=MscPUSCH−Msc,nominalPT-RS(l) for a symbol including no DMRS. Msc,nominalPT-RS(l) is the number of subcarriers including the PTRS within the symbol l for the PUSCH assuming nominal repetition. Msymb,nominalPUSCH is the total number of symbols for nominal repetition of the PUSCH. Msc,actualUCI(l) is the number of resource elements which can be used for UCI transmission for actual repetition, and corresponds to 0 for a symbol including the DMRS and Msc,actualUCI(l)=MscPUSCH−Msc,actualPT-RS(l) for a symbol including no DMRS. Msc,actualPT-RS(l) is the number of subcarriers including the PTRS within the symbol l for actual repetition of the PUSCH. Msymb,actualPUSCH is the total number of symbols for actual repetition of the PUSCH. In [Equation 5], R is a code rate of the PUSCH, and Qm is a modulation order of the PUSCH.
The number of coded modulation symbols per layer having passed through the rate matching of CSI part 1 may be calculated similarly to HARQ-ACK, but the number of resources which can be maximally allocated among all resources is reduced to a value except for the number of coded modulation symbols for HARQ-ACK/CG-UCI. Equations of calculating coded modulation symbols per layer of CSI part 1 are [Equation 6], [Equation 7], [Equation 8], and [Equation 9] according to the PUSCH repetitive transmission type and whether the UL-SCH is included or not.
[Equation 6] is an equation of calculating coded modulation symbols per layer for CSI part 1 multiplexed to the PUSCH in the case of non-PUSCH repetitive transmission type B including the UL-SCH, and [Equation 7] is an equation of calculating coded modulation symbols per layer for CSI part 1 multiplexed to the PUSCH repetitive transmission type B including the UL-SCH. [Equation 8] is an equation of calculating coded modulation symbols per layer for multiplexed CSI part 1 when CSI part 1 and CSI part 2 are multiplexed to the PUSCH including no UL-SCH. [Equation 9] is an equation of calculating coded modulation symbols per layer for multiplexed CSI part 1 when CSI part 2 is not multiplexed to the PUSCH including no UL-SCH. In [Equation 6], OCSI-1 and LCSI-1 are the number of bits for CSI part 1 and the number of CRC bits for CSI part 1. βoffsetPUSCH is a beta offset for CSI part 1 and corresponds to βoffsetCSI-part1. Q′ACK/CG-UCI is the number of coded modulation symbols per layer calculated for HARQ-ACK and/or CG-UCI. Other parameters are the same as the parameters required for calculating the number of coded modulation symbols per layer for HARQ-ACK.
The number of coded modulation symbols per layer having passed through the rate matching of CSI part 2 may be calculated similarly to CSI part 1, but the number of resources which can be maximally allocated among all resources is reduced to a value except for the number of coded modulation symbols for HARQ-ACK/CG-UCI and the number of coded modulation symbols for CSI part 2. Equations of calculating coded modulation symbols per layer of CSI part 1 are [Equation 10], [Equation 11], and [Equation 12] according to the PUSCH repetitive transmission type and whether the UL-SCH is included or not.
[Equation 10] is an equation of calculating coded modulation symbols per layer for CSI part 2 multiplexed to the PUSCH in the case of non-PUSCH repetitive transmission type B including the UL-SCH, and [Equation 11] is an equation of calculating coded modulation symbols per layer for CSI part 2 multiplexed to the PUSCH repetitive transmission type B including the UL-SCH. [Equation 12] is an equation of calculating coded modulation symbols per layer for CSI part 2 multiplexed to the PUSCH including no UL-SCH. In [Equation 10], OCSI-2 and LCSI-2 are the number of bits for CSI part 2 and the number of CRC bits for CSI part 2. βoffsetPUSCH is a beta offset for CSI part 2 and corresponds to βoffsetCSI-part2. Other parameters are the same as the parameters required for calculating the number of coded modulation symbols per layer for HARQ-ACK and CSI part 1.
The number of coded modulation symbols per layer having passed through the rate matching of CG-UCI may also be calculated similarly to HARQ-ACK. An equation of calculating coded modulation symbols per layer of CG-UCI multiplexed to the PUSCH including the UL-SCH is [Equation 13].
In [Equation 13], OCG-UCI and LCG-UCI are the number of bits of CG-UCI and the number of CRC bits for CG-UCI. βoffsetPUSCHβoffsetPUSCH is a beta offset for CG-UCI and corresponds to βoffsetCG-UCI. Other parameters are the same as the parameters required for calculating the number of coded modulation symbols per layer for HARQ-ACK.
HARQ-ACK and CG-UCI are multiplexed to the PUSCH including the UL-SCH, the number of coded modulation symbols per layer having passed through rate matching of HARQ-ACK and CG-UCI may be calculated through [Equation 14].
In [Equation 14] βoffsetPUSCH is a beta offset for HARQ-ACK and corresponds to βoffsetHARQ-ACK, and other parameters are the same as the parameters required for calculating the number of coded modulation symbols per layer for HARQ-ACK.
In an embodiment of the disclosure, a specific type of transmission/reception side structure may be needed to effectively process self-interference between a transmission signal (or a downlink signal) and a reception signal (or an uplink signal). For example, the transmission/reception side structure illustrated in
An embodiment of the disclosure provides various embodiments for configuring resources for uplink and downlink transmission and reception in the time and frequency domains and provides a method of performing rate matching according to a UCI type multiplexed to the PUSCH in a specific uplink and downlink transmission and reception resource pattern, a PUSCH repetitive transmission type, and whether the UL-SCH is included or not.
Hereinafter, higher-layer signaling may be signaling corresponding to at least one of the following signalings or a combination of one or more thereof.
L1 signaling may be signaling corresponding to at least one of the following physical layer channels or signaling methods or a combination of one or more thereof.
A first embodiment of the disclosure relates to a method and an apparatus for configuring resources for uplink or downlink transmission and reception in the time domain and the frequency domain through cell-specific configuration information on the XDD system. Through the resource configuration method for downlink or uplink transmission and reception according to an embodiment of the disclosure, the UE may receive a configuration of uplink resources and downlink resources in different frequency domains within the same time domain.
Accordingly, time domain resources in which the UE can perform uplink transmission or downlink reception may increase, and thus the uplink coverage of the UE and the BS may increase as described above. Hereinafter, for convenience of description, the resource configuration for uplink or downlink transmission and reception is referred to as an uplink-downlink configuration.
Specifically, as described above, the UE may receive allocation of resources divided for uplink and downlink transmission and reception not only in the time domain but also in the frequency domain in the XDD system, and thus the resource configuration for uplink or downlink transmission and reception may be configured not only in the time domain but also each of the time domain and the frequency domain like in the TDD system. The BS may configure the guard band in the UE through the resource configuration for uplink or downlink transmission and reception in the time domain and the frequency domain, thereby controlling an interference effect by OOB emission caused according to frequency bands of the uplink and downlink resources being relatively closer than the FDD. Further, the UE may determine a frequency band in which scheduling is actually performed and a signal can be transmitted and received even though an uplink BWP and a downlink BWP have the same center frequency through the resource configuration for uplink or downlink transmission and reception in the time domain and the frequency domain.
Hereinafter, an uplink or downlink configuration method in the time domain and the frequency domain in the XDD system is provided.
The following methods may be considered as the method of configuring resources for uplink or downlink transmission and reception in the time domain and the frequency domain in the XDD system.
For the resource configuration for uplink or downlink transmission and reception in the time domain and the frequency domain, the BS divides the entire frequency band into n frequency bands and indicates the uplink and downlink configuration in the time domain to the UE in every frequency band. A method of dividing the entire frequency bands into n frequency bands is described through a second embodiment. Each of the n frequency bands may include a set of successive resource blocks, which may be referred to as a resource block set (RBS) or a resource block group, and is described as an RBS in the disclosure for convenience of description. Uplink-downlink configuration information may include uplink-downlink pattern information and subcarrier information which is a reference in each frequency band. Through the uplink-downlink pattern information, a pattern period 603 in the time domain, the number 611 of consecutive downlink slots from a start point of each pattern, the number 612 of symbols of the next slot, the number 613 of consecutive uplink slots from the end of the pattern, and the number 614 of symbols of the next slot may be indicated. At this time, the UE may determine that the slot and symbol which are not indicated by the uplink and the downlink are flexible slot/symbol.
Referring to
For the uplink-downlink configuration, the uplink-downlink is configured for each RBS within limited overhead, and thus uplink or downlink resources may be relatively flexibly configured in the time domain.
For the uplink-downlink configuration in the time domain and the frequency domain, the BS divides the entire frequency band into n frequency bands and indicates the uplink-downlink configuration in the frequency domain to the UE. In each pattern, uplink-downlink configuration information may include uplink-downlink pattern information and subcarrier information which is a reference. Through the uplink-downlink pattern information, the number of slot(s)/symbol(s) of the time domain having the same pattern, the number of consecutive downlink RBSs from the start point of the entire frequency band, the number of downlink RBs of the next RBS, the number of consecutive uplink RBSs from the end of the entire frequency band, and the number of uplink RBs of the next RBS may be indicated. At this time, the RBS and the RB which are not indicated as the uplink and the downlink may be determined as a (flexible) RBS/RB.
Referring to
For the uplink-downlink configuration, the uplink-downlink is configured with a period of the time domain in the frequency domain for each pattern within limited overhead, and thus the uplink or downlink may be relatively flexibly configured in the frequency domain. At this time, the guard band may be efficiently configured to reduce interference to reception of an uplink channel or signal by out-of-band emission generated when the BS transmits a downlink channel or signal in downlink resources in the XDD system.
The second embodiment of the disclosure discloses the method of dividing the entire frequency band into n frequency bands according to the first embodiment. Specifically, like in the TDD system, it is required to divide frequency resources in specific units in order to configure uplink-downlink resources in the XDD system as well as dividing the uplink and downlink resources in the time. Particularly, when the entire frequency band is 100 MHz and subcarrier spacing is 30 kHz, the number of RBs may be 273. At this time, when each of the 273 RBs are configured by uplink or downlink resources, significant overhead may be generated.
Accordingly, for the uplink-downlink configuration in the time domain and the frequency domain in the XDD system, the following methods may be considered as a method of dividing a frequency band into groups.
RBs in a frequency band may include n groups including the specific number of RBs. The number of RBs in each group may be determined through an uplink-downlink pattern configuration or may be prearranged, and the number of groups may be n. For example, when subcarrier spacing (SCS) is 30 kHz and the entire frequency band is 100 MHz, the total number of RBs is 273. At this time, when the number of RBs per group is 24 and is included and configured in an uplink-downlink pattern or the 24 RBs are prearranged, the total number n=[total number of RBs/number of RBs configured for each group]=[273/24]=12 of groups may be configured. This may be efficiently determined to reduce overhead for the uplink-downlink configuration in the frequency domain as described above.
The method is a method of configuring RBs in the frequency band as n groups including the specific number of RBs, the number of RBs configured per group is not limited to determination by the uplink-downlink pattern configuration or the prearranged value, and information required for configuring the number of RBs per group may be included in system information block, user-specific configuration information through dedicated-higher-layer signaling, MAC CE, or downlink control information which is L1 signaling.
The entire frequency band may include n groups of a specific frequency band. A specific frequency band value per group may be determined through an uplink-downlink pattern configuration or may be prearranged, and the number of groups may be n. For example, when the entire frequency band is 100 MHz and a frequency band per group of 20 MHz is included in and indicated by the uplink-downlink pattern configuration or a prearranged frequency band is configured as 20 MHz, the total number n=[entire frequency band/frequency band configured for each group]=[100/20]=5 of groups may be configured. This may be efficiently determined to reduce overhead for the uplink-downlink configuration of the frequency domain as described above.
The method is a method of configuring the frequency band as n groups of a specific frequency band, and the method of receiving a configuration of a frequency band value per group is not limited to a configuration of an uplink-downlink pattern. The frequency band value per group may be configured as the prearranged number of RBs or information used for configuring the frequency band value per group may be included in system information block, user-specific configuration information through dedicated-higher-layer signaling, MAC CE, or downlink control information which is L1 signaling.
The entire frequency band may include two groups based on a guard band. A frequency band of the guard band may be indicated through an uplink-downlink pattern configuration, and two groups of a frequency band lower than the guard band and a frequency band higher than the guard band may be configured based on the guard band. For example, when a start location and a size of the guard band are configured as a 100th CRB from a point A and 50 CRBs in the entire frequency band of 100 MHZ, CRBs from the point A to a 99th CRB which is a frequency band lower than the board band may be classified as a first group and CRBs from a 150th CRB to the last CRB may be classified as a second group. This may be efficiently determined to reduce overhead for the uplink-downlink configuration in the frequency domain as described above. Particularly, it is very difficult to allocate non-successively the downlink or the uplink at the same time point in implementation of the BS, and interference by the OOB may be generated between the uplink and the downlink as described above. Accordingly, when the downlink or the uplink should be always successively configured, two groups may be efficiently divided by the guard band configured between the downlink and the uplink.
The method is a method of configuring the frequency band as two groups based on the guard band, and a method of receiving a guard band-related configuration is not limited to a configuration of an uplink-downlink pattern. The guard band may be configured as the prearranged number of RBs or information used for configuring the guard band may be included in system information block, user-specific configuration information through dedicated-higher-layer signaling, MAC CE, or downlink control information which is L1 signaling.
According to an embodiment of the disclosure, uplink and downlink resources may be flexibly configured in the time and frequency domains. That is, random time and frequency resources may be configured as the uplink or the downlink. Thereafter, in the description of the disclosure, a configuration as the uplink or the downlink in random time and frequency resources is named an “uplink and downlink configuration (UL_DL_configuration)”. The uplink and downlink configuration may include a downlink symbol, an uplink symbol, and a flexible symbol.
According to an embodiment of the disclosure, the uplink and downlink configuration may be statically, semi-statically, or dynamically changed. According to an embodiment of the disclosure, the BS may configure or indicate uplink and downlink configuration information to the UE through higher-layer signaling, L1 signaling, or a combination of higher-layer signaling and L1 signaling. For example, the BS may perform the uplink configuration in the UE through higher-layer signaling. In another example, the BS may perform one or a plurality of uplink and downlink configurations in the UE through higher-layer signaling, and activate one uplink and downlink configuration thereof through higher-layer signaling (for example, MAC CE) or L1 signaling. The UE may acquire uplink and downlink configuration information from the BS, expect reception of a signal in resources configured as the downlink, and expect transmission of a signal in resources configured as the uplink. Various detailed uplink and downlink configuration methods may follow the first embodiment and the second embodiment.
According to an embodiment of the disclosure, the uplink and downlink configuration may be changed based on L1 signaling (for example, DCI). More specifically, the BS may transmit a DCI format including an indicator for changing an uplink and downlink configuration A to an uplink and downlink configuration B to the UE through the PDCCH. The UE may receive the DCI format including the indicator for changing the uplink and downlink configuration from the BS and change the uplink configuration A to the uplink configuration B, based on the content indicated by the received DCI format.
According to an embodiment of the disclosure, a table including a plurality of uplink and downlink configurations for changing the uplink and downlink configuration may be predefined or may be configured in the UE by the BS through higher-layer signaling. For example, an “uplink and downlink configuration table” including N uplink and downlink configurations {uplink and downlink configuration #1, uplink and downlink configuration #2, uplink and downlink configuration #3, . . . , uplink and downlink configuration #N} may be predefined or may be configured in the UE by the BS through higher-layer signaling. The BS may transmit an indicator for activating uplink and downlink configuration #X within the uplink and downlink configuration table to the UE through L1 signaling (for example, the DCI format). The UE may activate uplink and downlink configuration #X indicated by L1 signaling (for example, the DCI format) received from the BS, based on the predefined ore preset uplink and downlink configuration table.
According to an embodiment of the disclosure, when the uplink and downlink configuration is changed, an additional change delay time (Tdelay) may be considered. As described above, the optimal parameter values of respective transmission and reception side blocks for effectively processing interference between the downlink and the uplink may be different according to the uplink and downlink transmission resource pattern, and accordingly, a predetermined delay time (Tdelay) for changing the transmission and reception side parameter values may be generated according to the change in the uplink and downlink configuration.
According to an embodiment of the disclosure, the change delay time Tdelay 1620 may be always considered when the uplink and downlink configuration is changed. That is, the change delay time Tdelay may be required regardless of whether the condition A is satisfied or not.
According to an embodiment of the disclosure, the uplink and downlink change delay time Tdelay may be predefined as a fixed value. The BS and the UE may determine the change delay time, based on the predefined Tdelay.
According to an embodiment of the disclosure, the uplink and downlink change delay time Tdelay may be explicitly configured or notified to the UE by the BS through higher-layer signaling. The UE may determine the change delay time, based on Tdelay received from the BS.
According to an embodiment of the disclosure, the uplink and downlink change delay time Tdelay may be notified to the BS by the UE through a UE capability report (UE capability signaling). The BS may determine the change delay time, based on Tdelay received from the UE.
According to an embodiment of the disclosure, the uplink and downlink change delay time Tdelay may be defined as a different value according to a subcarrier spacing value. That is, Tdelay,i may be defined for subcarrier spacing i. For example, Tdelay,0 may be required when subcarrier spacing is 15 kHz, Tdelay,1 may be required when subcarrier spacing is 30 kHz, Tdelay,2 may be required when subcarrier spacing is 60 kHz, and Tdelay,3 may be required when subcarrier spacing is 120 kHz,
According to an embodiment of the disclosure, the uplink and downlink change delay time Tdelay may be defined as the same value regardless of the subcarrier spacing value.
According to an embodiment of the disclosure, the uplink and downlink change delay time Tdelay may have a different value according to uplink and downlink configuration information before the change or after the change. For example, when an uplink and downlink configuration A1 is changed to an uplink and downlink configuration B1, the change delay time Tdelay,1 may be required. For example, when an uplink and downlink configuration A2 is changed to an uplink and downlink configuration B2, the change delay time Tdelay,2 may be required.
According to an embodiment of the disclosure, the uplink and downlink change delay time Tdelay may have a different value according to a changed range of frequency domain resources The range of frequency domain resources may be determined based on at least one of a band of the frequency domain resources or a size of the frequency domain resources.
According to an embodiment of the disclosure, the UE may not expect transmission or reception during the uplink and downlink change delay time Tdelay. More specifically, when the UE receives an indicator for changing the uplink and downlink configuration in the slot n and the indicator corresponds to a change requiring the uplink and downlink change delay time, the UE may not expect transmission or reception during slots from the slot n to a slot n+Tdelay.
According to an embodiment of the disclosure, the uplink and downlink configuration change indicator may be transmitted from the BS to the UE through at least one method among common DCI (or a DCI format monitored in a common search space), group-common DCI (or a DCI format monitored in a type-3 common search space), UE-specific DCI (or a DCI format monitored in a UE-specific search space), a DCI format including scheduling, or a DCI format including no scheduling.
According to an embodiment of the disclosure, the uplink and downlink configuration change indicator may include uplink and downlink configuration information for one or a plurality of slots. That is, the BS may transmit the configuration change indicator indicating the uplink and downlink configuration for one or a plurality of slots to the UE, and the UE may receive the configuration change indicator indicating the uplink and downlink configuration for one or a plurality of slots from the BS.
First, the BS procedure is described with reference to
In operation 1700, the BS may transmit uplink and downlink configuration information to the UE. In operation 1701, the BS may transmit an uplink and downlink configuration change indicator to the UE. In operation 1702, the BS may determine whether a condition A is satisfied. When it is determined that the condition A is satisfied, the BS may change the uplink and downlink configuration in consideration of a change delay time in operation 1703. When it is determined that the condition A is not satisfied, the BS may change the uplink and downlink configuration without any change delay time in operation 1704.
Subsequently, the UE procedure is described with reference to
In operation 1710, the UE may receive uplink and downlink configuration information from the BS. In operation 1711, the UE may receive an uplink and downlink configuration change indicator from the BS. In operation 1712, the UE may determine whether a condition A is satisfied. When it is determined that the condition A is satisfied, the UE may change the uplink and downlink configuration in consideration of the change delay time in operation 1713. When it is determined that the condition A is not satisfied, the BS may change the uplink and downlink configuration without any change delay time in operation 1714.
According to an embodiment of the disclosure, a method of UCI rate matching performed when uplink control information (hereinafter, referred to as UCI) is multiplexed for PUSCH transmission in the XDD system is described.
In the XDD system, the case in which UL resources and DL resources exist in different frequency resources in specific time resources (slots or OFDM symbols) may be considered. This case may occur through a method of two-dimensionally configuring or indicating a TDD configuration to the UE within the same time resource. That is, resources for UL transmission in a first frequency domain and resources for DL transmission in a second frequency domain may be allocated to the UE in one slot. Alternatively, this case may occur even when a currently activated uplink bandwidth part of the UE and a deactivated downlink bandwidth part configured in the corresponding UE partially overlap in some frequency resources. The BS may perform scheduling such that the deactivated downlink bandwidth for the corresponding UE can be used by another UE as an activated bandwidth part through the configuration method. Accordingly, in the two cases, the former is the case in which actual DL resources are allocated and the latter is the case in which actual DL resources are allocated but some frequency resource area parts overlap DL resources. However, both the two cases may be referred to as the case in which some frequency resources are DL resources in the disclosure. That is, the former is the case in which resources for UL transmission are also allocated to the slot to which resources for DL transmission are allocated. In this case, the resources for DL transmission and the resources for UL transmission may partially overlap. The latter is the case in which the resources for UL transmission are allocated to the UE but some of the allocated resources overlap resources for DL transmission of another UE. That is, the slot having some frequency resources corresponding to DL resources means that DL resources and UL resources exist in different frequency resources in a specific slot. In the disclosure, a slot having some frequency resources corresponding to DL resources is named an XDD slot for convenience of description. This is only an example, and the slot may be named another term. At this time, some guards may exist between the DL resources and the UL resources according to a UE capability.
Meanwhile, when the UE performs UCI rate matching, the number of coded modulation symbols per layer may be determined through [Equation 3] to [Equation 14] according to the type of UCI multiplexed to the PUSCH, the PUSCH repetitive transmission type to which UCI is multiplexed, and whether the UL-SCH of the corresponding PUSCH is transmitted. At this time, MscUCI used for determining the number of coded modulation symbols per layer is based on a bandwidth MscPUSCH scheduled for PUSCH transmission. This means that, when the number of symbols for UCI rate matching and transmission, the UE considers resources for the entire bandwidth in which the PUSCH is scheduled. However, in the XDD system, not all the frequency resources in which the slot for transmitting the PUSCH to which UCI is multiplexed is scheduled are configured as the uplink, but some frequency resources may be the slot (that is, XDD slot) having DL resources.
In
As described above, in the XDD slots, the UE transmits the PUSCHs 1824 and 1831 through the reduced resources compared to the scheduled PUSCH resources. Further, like in slot #3, when the PUCCH 1832 overlaps the PUSCH in the time domain and the UE performs UCI multiplexing, the UE should perform rate matching for multiplexing UCI to the PUSCH having the bandwidth reduced to Msc,XDDPUSCH. In the disclosure, when the PUSCH and the PUCCH overlap XDD slots having UL resources and DL resources existing in different frequency resources in the XDD system, a method by which the UE performs rate matching considering the reduced bandwidth compared to the scheduled bandwidth and determines the number of coded modulation symbols per layer for each UCI, based thereon is described in detail. More specifically, a UCI rate matching method for PUSCH transmission other than the PUSCH repetitive transmission type B including the UL-SCH is described in detail in embodiment 4-1, and a UCI rate matching method for the PUSCH repetitive transmission type B transmission including the UL-SCH is described in embodiment 4-2. Further, a rate matching method for UCI multiplexed to the PUSCH when the UL-SCH is not included in the PUSCH is described in embodiment 4-3.
According to an embodiment of the disclosure, a method by which the UE performs UCI rate matching when UCI is multiplexed to PUSCH transmission other than the PUSCH repetitive transmission type B including the UL-SCH is described in detail. For example, PUSCH transmission other than the PUSCH repetitive transmission type B may be a PUSCH repetitive transmission type A or single PUSCH transmission. For convenience description, the PUSCH repetitive transmission type A is assumed, but the disclosure is limited to the PUSCH repetitive transmission type A and the method of embodiment 4-1 may be similarly applied to single PUSCH transmission and PUCCH transmission overlapping the XDD slot.
When the UE calculates the number of coded modulation symbols per layer through rate matching in order to multiple UCI to the PUSCH transmitted through the XDD slot in the XDD system, there may be a method of performing calculation based on an amount of resources of the scheduled PUSCH and comparing the resources with resources through which UCI can be actually transmitted to determine the number and a method of performing calculation based on an amount of the PUSCH actually transmitted in the XDD slot, comparing the resources with resources through which UCI can be actually transmitted to determine the number. When the method of performing calculation based on the amount of resources of the scheduled PUSCH and comparing the resources with the resources through which UCI can be actually transmitted to determine the number is defined as [Method 4-1-1] like the first method, a detailed method according to each UCI type may be considered as follows. At this time, for all cases, it is assumed that the timeline condition (see the 3GPP standard TS 38.213 clause 9.2.5) for multiplexing UCI is satisfied.
In [Equation 15] and [Equation 16], Msc,XDDUCI(l) is the number of resource elements which can be used for multiplexing UCI to the symbol l within the XDD slot. When the symbol l includes a DMRS, Msc,XDDUCI(l)=0 and, otherwise, Msc,XDDUCI(l)=Msc,XDDPUSCH−Msc,XDDPT-RS(l). Msc,XDDPUSCH is the number of all subcarriers through which the PUSCH can be transmitted in the XDD slot, and Msc,XDDPT-RS(l) is the number of subcarriers of a PTRS included in the symbol l.
Unlike [Method 4-1-1], when the bandwidth of the actually transmitted PUSCH is reduced according to the XDD slot, rate matching may be performed in consideration of the reduced bandwidth. When this is defined as [Method 4-1-2], a detailed method according to each UCI type may be considered as follows.
In [Equation 21], Msc,XDDUCI(l) is defined as the number of subcarriers in which the PUSCH can be transmitted in the symbol l within the XDD slot. When the symbol l includes a DMRS, Msc,XDDUCI(l)=0. When the symbol l does not include a DMRS, Msc,XDDUCI(l)=Msc,XDDPUSCH(l)−Msc,XDDPT-RS(l), and Msc,XDDPT-RS(l) is the number of subcarriers of a PTRS included in the symbol l within the XDD slot. When Q′ACK,XDD is determined as shown in [Equation 21], QACK,XDD may be a value smaller than Q′ACK,XDD determined based on the scheduled bandwidth MscPUSCH, that is, calculated by [Equation 15]. This means that reliability of transmission after HARQ-ACK is multiplexed to the PUSCH is reduced. In order to compensate for this, when Q′ACK,XDD is calculated based on [Equation 21] according to method 2, an additional higher-layer parameter βoffsetPUSCH,XDD may be introduced to calculate Q′ACK,XDD in the XDD slot rather than βoffsetPUSCH configured as the existing higher-layer parameter. βoffsetPUSCH,XDD may be added to a higher-layer parameter UCI-OnPUSCH in which βoffsetPUSCH is configured or configured within a new higher-layer parameter (for example, CG-UCI-OnPUSCH-ForXDD). Such a new beta offset value may be similarly defined for CSI part 1 and CSI part 2 as well as HARQ-ACK.
According to an embodiment of the disclosure, a method by which the UE performs UCI rate matching when UCI is multiplexed to the PUSCH repetitive transmission type B including the UL-SCH is described in detail.
As described above, the PUSCH repetitive transmission type B may be considered according to division of nominal repetition based on scheduling information and actual repetition corresponding to the unit of actual transmission by the UE in consideration of the slot boundary and the nominal repetition. When the PUCCH overlaps a plurality of actual repetitions of the PUSCH repetitive transmission type B and all of the overlapping actual repetitions satisfy a timeline condition for UCI multiplexing (see 3GPP standard TS 38.213 clause 9.2.5), the UE multiplex UCI (for example, HARQ-ACK and/or CSI information) to the earliest actual repetition among the overlapping actual repetitions. At this time, the UE does not expect the case in which all of the actual repetitions overlapping the PUCCH have symbols not larger than 1. Unlike the case of the PUSCH repetitive transmission type A or single PUSCH transmission in the XDD system, UCI is multiplexed to actual repetition in the PUSCH repetitive transmission type B, and thus the number of resources available for UCI multiplexing may be reduced by reduction in the number of symbols of actual repetition due to bandwidth reduction by the XDD slot and the slot boundary. Accordingly, in order to determine the number of coded modulation symbols per layer in the case in which UCI is multiplexed to the PUSCH repetitive transmission type B, the reduction in the number of resources available for UCI multiplexing may be considered.
In
Similar to the description in embodiment 4-1, the methods may be divided into a method of performing calculation, based on an amount of resources of the scheduled PUSCH, comparing the same with resources for actually transmitting UCI, and determining the number and a method of performing calculation, based on an amount of resources of the PUSCH actually transmitted in the XDD slot, comparing the same with resources for actually transmitting UCI, and determining the number. However, in the PUSCH repetitive transmission type B transmitted in the XDD slot, the number of symbols in the time domain and a bandwidth in the frequency domain may be reduced, and thus candidates for determining the number of coded modulation symbols per layer may be variously calculated according to the reduced resources in the time or frequency domain. In embodiment 4-2, a method of calculating the number of coded modulation symbols per layer based on the scheduled bandwidth MscPUSCH 1912 in the frequency domain and the number Nsymb,nominalPUSCH 1915 of symbols of nominal repetition in the time domain, comparing the number with resources for actually transmitting UCI, and determining the number of symbols to which UCI is multiplexed is defined as [Method 4-2-1]. In another method, a method of calculating the number of coded modulation symbols per layer based on the bandwidth Msc,XDDPUSCH 1922 in the frequency domain reduced by the XDD slot and the number Nsymb,nominalPUSCH 1915 of symbols of nominal repetition in the time domain, comparing the number with resources for actually transmitting UCI, and determining the number of symbols to which UCI is multiplexed is defined as [Method 4-2-2]. In another method, a method of calculating the number of coded modulation symbols per layer based on the bandwidth MscPUSCH 1912 in the frequency domain in which the PUSCH is scheduled and the number Nsymb,actualPUSCH 1923 of symbols which can be reduced by the actual repetition in the time domain, comparing the number with resources for actually transmitting UCI, and determining the number of symbols to which UCI is multiplexed is defined as [Method 4-2-3]. In another method, a method of calculating the number of coded modulation symbols per layer based on the bandwidth Msc,XDDPUSCH 1922 in the frequency domain reduced by the XDD slot and the number Nsymb,actualPUSCH 1923 of symbols which can be reduced by the actual repetition in the time domain, comparing the number with resources for actually transmitting UCI, and determining the number of symbols to which UCI is multiplexed is defined as [Method 4-2-4]. As described above, methods of determining the number of coded modulation symbols per layer according to each UIC type are described in detail in consideration of [Method 4-2-1] to [Method 4-2-4] and each UCI type. At this time, it is assumed that the timeline condition for multiplexing UCI (see 3GPP standard TS 38.213 clause 9.2.5) is satisfied for all cases.
In [Equation 26], Msc,nom,schUCI(l) is the number of resource elements which can be used for multiplexing UCI to the symbol l considering the scheduled bandwidth and the number of symbols of the nominal repetition, and is the number of resource elements which can be used for multiplexing UCI to the symbol of the PUSCH corresponding to reference numeral 1913 of
Σl=0N
In [Equation 29], Msc,nom,XDDUCI(l) is the number of resource elements which can be used for multiplexing UCI to the symbol l considering the bandwidth in the frequency domain reduced by the XDD slot and the number of symbols of the nominal repetition, and is the number of resource elements which can be used for multiplexing UCI to the symbol l of the PUSCH corresponding to reference numeral 1919 of
Σl=0N
[Method 4-2-2: CSI part 1] similar to HARQ-ACK, the number Q′CSI-1,XDD of coded modulation symbols per layer of CSI part 1 multiplexed to the PUSCH transmitted in the XDD slot may be determined as shown in [Table 30] below. Σl=0N
In [Equation 32], Msc,act,schUCI(l) is the number of resource elements which can be used for multiplexing UCI to the symbol l considering the bandwidth in which the PUSCH in the frequency domain is scheduled and the number of symbols of the actual repetition. That is, when it is assumed that there is no DL resource in
Σl=0N
In [Equation 35], Msc,act,XDDUCI(l) is the number of resource elements which can be used for multiplexing UCI to the symbol l considering the bandwidth in the frequency domain reduced by the XDD slot and the number of symbols of the actual repetition, and is the number of resource elements which can be used for multiplexing UCI to the symbol l of the PUSCH corresponding to reference numeral 1925 of
When rate matching is performed according to [Method 4-2-2] to [Method 4-2-4] considering reduced resources in the XDD slot, the higher-layer parameter βoffsetPUSCH,XDD may be additionally introduced to calculate Q′ACK,XDD in the XDD slot, rather than βoffsetPUSCH configured as the existing higher-layer parameter as described above in [Method 4-1-2].
According to an embodiment of the disclosure, a method by which the UE performs rate matching when UCI is multiplexed to the PUSCH including no UL-SCH is described in detail. Unlike embodiment 4-1 and embodiment 4-2, the UL-SCH is not included, and thus rate matching is performed based on a scheduled code rate, a modulation order, and an amount of resources of the scheduled PUSCH. In the XDD system, the UE may perform rate matching through the following method according to each UCI type and determine coded modulation symbols per layer for each UCI.
As an embodiment of the disclosure, an operation in which the UE reporting a UE capability which can support the XDD system and determines a rate matching method, based thereon is described in detail.
The UE may report at least one of the lists below as the UE capability to indicate that the operation of the UE which has been mentioned in the various embodiments can be performed.
For example, the UE capability indicating whether each rate matching method of UCI multiplexed to the PUSCH is supported may include indicators indicating whether, when the UE performs rate matching the number of coded modulation symbols per layer can be determined in consideration of a bandwidth reduced for the XDD slot and the number of coded modulation symbols per layer can be determined in consideration of the reduced number of OFDM symbols according to actual repetition. Alternatively, whether, when the number of coded modulation symbols per layer is determined, calculation for rate matching is performed based on scheduled PUSCH resources and is compared with an amount of actual transmission resources or whether calculation for rate matching is performed based on an amount of actual transmission resources may be included in the UE capability. Alternatively, the UE capability indicating whether the detailed rate matching methods described in embodiment 4-1 are supported, the UE capability indicating whether the detailed rate matching methods described in embodiment 4-2 are supported, and the UE capability indicating the detailed rate matching methods described in embodiment 4-3 may be included. The UE capabilities may be configured as information elements for reporting the UE capability to be individually reported and reported to the BS or may be reported to the BS in the form of detailed values within one information element.
Thereafter, the BS configures a higher-layer parameter (for example, a new beta offset value according to the detailed methods as necessary) for supporting the XDD system and performing rate matching, based on the UE capabilities reported by the UE. The UE may support the XDD system according to the higher-layer parameter configured by the BS and determine a rate matching method for multiplexing UCI to the PUSCH according to the higher-layer parameter configured by the BS. When the XDD system is supported but the higher-layer parameter (for example, a new higher-layer parameter ‘RateMatchingforXDD’ indicating a rate matching method is configured within the higher-layer parameter UCI-OnPUSCH) for performing the rate matching method considering the same is not configured, the UE multiplexes UCI to the PUSCH by using a rate matching method of NR Release 15/16. When the XDD system is supported and the higher-layer parameter for performing the rate matching method considering the same is configured, the UE multiplexes UCI to the PUSCH by using a rate matching method according to each UCI type according to an implicitly determined method among the above-described detailed rate matching methods or a method explicitly determined by the new higher-layer parameter.
The UE may report the UE capability to the BS in operation 2001. Thereafter, the UE may receive higher-layer signaling from the BS in operation 2002. The UE identifies whether the XDD system is supported based on the higher-layer signaling configured by the BS in operation 2005. When the XDD system is not supported by the higher-layer configuration in operation 2020, the UE performs rate matching for UCI multiplexing which is the same as NR Release 15/16/17 to multiplex UCI to the PUSCH in operation 2030. When the XDD system is supported by the higher-layer configuration and the UE multiplexes UCI to the PUSCH in operation 2010, the UE identifies whether some frequency resources to which UCI is multiplexed are transmitted through a slot (XDD slot in the disclosure) which is a DL resource in operation 2011. When the PUSCH to which the UCI is multiplexed through uplink slots, all slots of which are UL resources, rate matching for UCI multiplexing which is the same as NR Release 15/16/17 is performed in operation 2030. When the PUSCH to which the UCI is multiplexed is transmitted through the XDD slot, the UE identifies whether the PUSCH includes a UL-SCH in operation 2012. When the corresponding PUSCH does not include the UL-SCH (for example, 1 bit of a UL-SCH indicator area within DCI is indicated as ‘0’ when the PUSCH is scheduled by DCI), the UE performs a rate matching method C in operation 2060. When the PUSCH which does not include the UL-SCH corresponding to embodiment 4-3 of the disclosure is supported, the rate matching method C is an uplink control information rate matching method, and the UE performs rate matching according to a UCI type multiplexed to the PUSCH as described above in embodiment 4-3. When the PUSCH to which UCI is multiplexed includes the UL-SCH, the UE identifies whether a repetitive transmission type of the corresponding PUSCH is B in operation 2013. When the corresponding PUSCH is transmitted according to the PUSCH repetitive transmission type B, the UE performs a rate matching method B in operation 2050. When the PUSCH repetitive transmission type B including the UL-SCH corresponding to embodiment 4-2 of the disclosure is supported, the rate matching method B is an uplink control information rate matching method, and the UE performs a rate matching according to a UCI type multiplexed to the PUSCH as described above in embodiment 4-2 and a method defined by the BS and the UE among [Method 4-2-1] to [Method 4-2-4]. At this time, the BS and the UE may determine one of [Method 4-2-1] to [Method 4-2-4] or a combination of the methods according to the UCI type through an implicit method or an explicit method based on a higher-layer configuration configured by the BS. When the corresponding PUSCH follows a PUSCH transmission scheme (for example, PUSCH repetitive transmission type A or single PUSCH transmission) other than the PUSCH repetitive transmission type B, the UE performs a rate matching method A in operation 2040. When the PUSCH transmission other than the PUSCH repetitive transmission type B including the UL-SCH corresponding to embodiment 4-1 of the disclosure is supported, the rate matching method A is an uplink control information rate matching method, and the UE performs a rate matching according to a UCI type multiplexed to the PUSCH as described above in embodiment 4-1 and a method defined by the BS and the UE among [Method 4-1-1] to [Method 4-1-2]. At this time, the BS and the UE may determine one of [Method 4-1-1] to [Method 4-1-2] or a combination of the methods according to the UCI type through an implicit method or an explicit method based on a higher-layer configuration configured by the BS. Thereafter, finishing preparation of PUSCH transmission, the UE transmits the PUSCH to which UCI is multiplexed to the BS in operation 2070.
The BS receives a UE capability report from the UE in operation 2101. The BS transmits higher-layer signaling to the UE, based on the UE capability information received from the UE in operation 2102. Thereafter, the BS schedules an uplink signal to the UE by performing a series of procedures for scheduling the uplink signal (for example, dynamic grant-based or configured grant-based PUSCH and/or PUCCH) (for example, dynamic grant-based PUSCH scheduling after reception of a scheduling request (SR) from the UE) in operation 2103. The BS receives the PUSCH from the UE in operation 2104. At this time, the received PUSCH may include UCI multiplexed according to scheduling information, a CSI report configuration (for example, a CSI report using the PUSCH based on a higher-layer parameter CSI-ReportConfig).
In the fourth embodiment, it is assumed that, when DL resources and UL resources exist in different frequency resources within the slot, the UE supports half-duplex of performing only one of uplink transmission or downlink reception for convenience of description. However, a rate matching method considering a bandwidth in which actual PUSCH transmission is possible compared to the scheduled bandwidth described in detail in the disclosure may be equally applied to a UE supporting full-duplex of performing uplink transmission and downlink reception at the same time as well as the half-duplex. Even though signals are simultaneously transmitted and received for the uplink, when resources used for transmission should be transmitted in a bandwidth narrower than the scheduled bandwidth in a specific slot due to downlink reception, UCI may be multiplexed to the PUSCH according to the detailed rate matching method described in the fourth embodiment and the UE capability report between the UE and the BS and the configured higher-layer parameter described in the fifth embodiment.
Referring to
In an embodiment, the transceiver 2201 may transmit and receive a signal to and from the BS. The signal may include control information and data. To this end, the transceiver 2201 may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal and an RF receiver for low-noise amplifying a received signal and down-converting the frequency. The transceiver 2201 may receive a signal through a wireless channel, output the signal to the processor 2203, and transmit the signal output from the processor 2203 through a wireless channel.
In an embodiment, the memory 2202 may store a program and data required for the operation of the UE. Further, the memory 2202 may store control information or data included in a signal transmitted and received by the UE. The memory 2202 may be configured by storage media such as ROM, RAM, hard disc, CD-ROM, and DVD, or a combination of the storage media. Further, the memory 2202 may include a plurality of memories. According to an embodiment, the memory 2202 may store a program for performing an operation of power saving of the UE.
In an embodiment, the processor 2203 may control a series of processes to allow the UE to operate according to the embodiments of the disclosure. In an embodiment, the processor 2203 may execute the program stored in the memory 2203, so as to receive information on a configuration for CA, a bandwidth part configuration, an SRS configuration, and a PDCCH configuration from the BS, and control a dormant cell operation process, based on configuration information.
Referring to
In an embodiment, the transceiver 2301 may transmit and receive a signal to and from the UE. The signal may include control information and data. To this end, the transceiver 2301 may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal and an RF receiver for low-noise amplifying a received signal and down-converting the frequency. The transceiver 2301 may receive a signal through a wireless channel, output the signal to the processor 2303, and transmit the signal output from the processor 2303 through a wireless channel.
In an embodiment, the memory 2302 may store a program and data required for the operation of the UE. Further, the memory 2302 may store control information or data included in a signal transmitted and received by the UE. The memory 2302 may be configured by storage media such as ROM, RAM, hard disc, CD-ROM, and DVD, or a combination of the storage media. Further, the memory 2302 may include a plurality of memories. According to an embodiment, the memory 2302 may store a program for performing an operation of power saving of the UE.
In an embodiment, the processor 2303 may control a series of processes to allow the BS to operate according to the embodiments of the disclosure. In an embodiment, the processor 2303 may execute the program stored in the memory 2302, so as to transmit information on a configuration for CA, a bandwidth part configuration, an SRS configuration, and a PDCCH configuration to the UE, and control a dormant cell operation of the UE, based on configuration information.
The methods according to various embodiments described in the claims or the specification of the disclosure may be implemented by hardware, software, or a combination of hardware and software.
When the methods are implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium may be configured for execution by one or more processors within the electronic device. The at least one program may include instructions that cause the electronic device to perform the methods according to various embodiments of the disclosure as defined by the appended claims and/or disclosed herein.
These programs (software modules or software) may be stored in non-volatile memories including a random access memory and a flash memory, a read only memory (ROM), an electrically erasable programmable read only memory (EEPROM), a magnetic disc storage device, a compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other type optical storage devices, or a magnetic cassette. Alternatively, any combination of some or all of them may form a memory in which the program is stored. Further, a plurality of such memories may be included in the electronic device.
In addition, the programs may be stored in an attachable storage device which may access the electronic device through communication networks such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), and Storage Area Network (SAN) or a combination thereof. Such a storage device may access the electronic device via an external port. Further, a separate storage device on the communication network may access a portable electronic device.
In the above-described detailed embodiments of the disclosure, an element included in the disclosure is expressed in the singular or the plural according to presented detailed embodiments. However, the singular form or plural form is selected appropriately to the presented situation for the convenience of description, and the disclosure is not limited by elements expressed in the singular or the plural. Therefore, either an element expressed in the plural may also include a single element or an element expressed in the singular may also include multiple elements.
The embodiments of the disclosure described and shown in the specification and the drawings are merely specific examples that have been presented to easily explain the technical contents of the disclosure and help understanding of the disclosure, and are not intended to limit the scope of the disclosure. That is, it will be apparent to those skilled in the art that other variants based on the technical idea of the disclosure may be implemented. Furthermore, the above respective embodiments may be employed in combination, as necessary. For example, a part of one embodiment of the disclosure may be combined with a part of another embodiment to operate a base station and a terminal. Moreover, The embodiments of the disclosure may be applied to other communication systems, and other variants based on the technical idea of the embodiments may also be implemented. For example, the embodiments may be applied to LTE, 5G, or NR systems.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2021-0095946 | Jul 2021 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2022/010173 | 7/13/2022 | WO |
