Patent Application
20240267954
This application is based on and claims priority under 35 U.S.C. § 119(a) of a Russian patent application number 2023102360, filed on Feb. 2, 2023, in the Russian Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.
The disclosure relates to communication systems. More particularly, the disclosure relates to communication methods and devices implementing a network communication procedure (e.g., an Initial Access (IA) procedure) with early Channel State Information (CSI) acquisition.
Considering the development of wireless communication from generation to generation, the technologies have been developed mainly for services targeting humans, such as voice calls, multimedia services, and data services. Following the commercialization of 5th-generation (5G) communication systems, it is expected that the number of connected devices will exponentially grow. Increasingly, these will be connected to communication networks. Examples of connected things may include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machines, and factory equipment. Mobile devices are expected to evolve in various form-factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In order to provide various services by connecting hundreds of billions of devices and things in the 6th-generation (6G) era, there have been ongoing efforts to develop improved 6G communication systems. For these reasons, 6G communication systems are referred to as beyond-5G systems.
6G communication systems, which are expected to be commercialized around 2030, will have a peak data rate of tera (1,000 giga)-level bps and a radio latency less than 100 μsec, and thus will be 50 times as fast as 5G communication systems and have the 1/10 radio latency thereof.
In order to accomplish such a high data rate and an ultra-low latency, it has been considered to implement 6G communication systems in a terahertz band (for example, 95 gigahertz (GHz) to 3 terahertz (THz) bands). It is expected that, due to severer path loss and atmospheric absorption in the terahertz bands than those in millimeter wave (mmWave) bands introduced in 5G, technologies capable of securing the signal transmission distance (that is, coverage) will become more crucial. It is necessary to develop, as major technologies for securing the coverage, radio frequency (RF) elements, antennas, novel waveforms having a better coverage than orthogonal frequency division multiplexing (OFDM), beamforming and massive multiple input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, and multiantenna transmission technologies such as large-scale antennas. In addition, there has been ongoing discussion on new technologies for improving the coverage of terahertz-band signals, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS).
Moreover, in order to improve the spectral efficiency and the overall network performances, the following technologies have been developed for 6G communication systems, a full-duplex technology for enabling an uplink transmission and a downlink (DL) transmission to simultaneously use the same frequency resource at the same time, a network technology for utilizing satellites, high-altitude platform stations (HAPS), and the like in an integrated manner, an improved network structure for supporting mobile base stations and the like and enabling network operation optimization and automation and the like, a dynamic spectrum sharing technology via collision avoidance based on a prediction of spectrum usage, an use of artificial intelligence (AI) in wireless communication for improvement of overall network operation by utilizing AI from a designing phase for developing 6G and internalizing end-to-end AI support functions, and a next-generation distributed computing technology for overcoming the limit of user equipment (UE) computing ability through reachable super-high-performance communication and computing resources (such as mobile edge computing (MEC), clouds, and the like) over the network. In addition, through designing new protocols to be used in 6G communication systems, developing mechanisms for implementing a hardware-based security environment and safe use of data, and developing technologies for maintaining privacy, attempts to strengthen the connectivity between devices, optimize the network, promote softwarization of network entities, and increase the openness of wireless communications are continuing.
It is expected that research and development of 6G communication systems in hyper-connectivity, including person to machine (P2M) as well as machine to machine (M2M), will allow the next hyper-connected experience. Particularly, it is expected that services such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica could be provided through 6G communication systems. In addition, services such as remote surgery for security and reliability enhancement, industrial automation, and emergency response will be provided through the 6G communication system such that the technologies could be applied in various fields such as industry, medical care, automobiles, and home appliances.
The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure.
Aspects of the disclosure are to addresses at least above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide earlier CSI acquisition, i.e. the CSI acquisition during an initial network communication procedure, the non-limiting examples of which include an IA procedure, a handover procedure, a radio link failure recovery procedure, or a beam failure detection and recovery procedure. These procedures are known from related art. The earlier CSI acquisition is implemented by at least using a modified (enhanced) Random Access Response (RAR) to a random access preamble, the response including at least a further Sounding Reference Signal (SRS) request field whose value indicates whether a UE should transmit the SRS.
Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.
In accordance with an aspect of the disclosure, a communication method performed by a UE during a network communication procedure is provided. The communication method includes transmitting a random access preamble within a Physical Random Access Channel (PRACH), receiving, within a Physical Downlink Shared Channel (PDSCH), a random access response (RAR) including a SRS request field whose value indicates whether the UE should transmit the SRS, when the SRS request field value indicates that the UE should transmit the SRS, transmitting the SRS, and receiving one or multiple subsequent DL transmissions with adaptive spatial signal processing performed on the basis of a CSI acquired on the basis of measurements of the SRS.
In accordance with another aspect of the disclosure, a UE which is configured to perform the communication method according to the first aspect of the disclosure or according to any further implementation of the first aspect of the disclosure is provided.
In accordance with another aspect of the disclosure, a communication method performed by a BS during a network communication procedure is provided. The communication method includes receiving from a UE a random access preamble within a PRACH, transmitting, within a PDSCH, a RAR message includes a SRS request field whose value indicates whether the UE should transmit the SRS, when the SRS request field value indicates that the UE should transmit the SRS, receiving the SRS, and receiving one or multiple subsequent DL transmissions with adaptive spatial signal processing performed on the basis of a CSI acquired on the basis of measurements of the received SRS.
In accordance with another aspect of the disclosure, a BS communicating in a communication network and configured to perform the communication method according to the third aspect of the disclosure or according to any further implementation of the third aspect of the disclosure is provided.
In accordance with another aspect of the disclosure, a communication system is provided. The communication system includes a plurality of UEs according to the second aspect of the disclosure or according to any further implementation of the second aspect of the disclosure and a plurality of BSs according to the fourth aspect of the disclosure or according to any further implementation of the fourth aspect of the disclosure, wherein said plurality of UEs and said plurality of BSs are configured to communicate with each other in this communication system.
Due to the above features of the disclosure, the communication between the devices being in a communication network (e.g., BS and UE) can be performed in optimal manner earlier than in the related art (see
Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.
The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:
Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of this disclosure is provided for illustration purpose only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.
It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces.
It will be understood that each method flow chart unit or any combination of such units may be implemented via computer program instructions. These instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to provide a component/device that, when executed, operates as a means for implementing functions specified in the method flow chart block or blocks. Such computer program instructions may be stored on a computer-used or computer-readable medium (e.g., in a memory).
In addition, each method flow chart unit may represent a module, segment or part of a code that includes one or multiple executable instructions for implementing a certain logical function(s). It should also be noted that in some alternative implementations, functions specified in the units may not be executed in the order in which they are indicated in the figures and described in the specification. Two units shown sequentially, for example, may actually be executed substantially concurrently, or sometimes the units may be executed in the reverse order depending on the desired functionality.
When a device is described herein, the term “unit” may refer to a program element or a hardware element of such a device, for example, to a Field Programmable Gate Array (FPGA), an Application-Specific Integrated Circuit (ASIC), a System on Chip (SoC), or at least to a certain portion of the foregoing components that perform a certain function or a set of functions. However, the “unit” does not always have a value limited to software or hardware. The “unit” can be constructed either for storage on an addressable storage medium, or for execution by one or more processors. Thus, the “unit” includes, for example, software elements, object-oriented software elements, class or task elements, processes, functions, properties, procedures, routines, program code segments, drivers, firmware, microcodes, circuits, data, database, data structures, tables, arrays, and parameters. Two or more “units” may be combined into a single “unit” or a single “unit” may be divided into two or more “units.” In addition, the “unit” in the embodiments may include one or more processors.
In the disclosure, Uplink (UL) refers to a radio link over which a UE transmits a data or a control signal to a BS, and Downlink (DL) refers to a radio link over which a BS transmits a data or a control signal to a UE. In addition, the BS is an entity that allocates a resource to the UE, and may be one of a transmit/receive point (Transmission/Reception Point) serving cells, eNode B, Node B, gNode B, a radio access unit, a base station controller, and a node in a network. The UE may include a user terminal, a mobile station (MS), a cell phone, a smartphone, a computer, or a media system configured to perform a communication function.
6G system operating in the upper-middle frequency band (10-12 GHZ) will support the use of large spatial signal encoding antenna arrays (Multiple Input Multiple Output, MIMO, ≥1024 antenna elements) with hybrid analog and digital beamforming with a large number of antenna ports (≥128) in a Base Station (BS). The awareness of the BS about channel state information (CSI) is essential to provide all performance-influencing communication advantages of the MIMO consisting in a beamforming that allows a transmit power for a signal to be steered into a desired direction, and in Spatial Multiplexing (SM) that allows the same time and frequency resource to be reused for transmitting a plurality of signals to the same User Equipment (UE) or to different UE.
The lack of CSI makes transmission from the BS highly inefficient because the lack of the CSI associated with analog beamforming is usually compensated by the beam sweeping operation across all available analog beams in the BS. In addition, the lack of the CSI associated with digital beamforming, that is referred to as precoding/spatial processing in the alternative terminology, is usually compensated by a more reliable transmission of physical channels with a lower modulation order and a coding rate that excessively consumes time and frequency resources.
The problems described above are illustrated referring to
A U.S. Pat. No. 11,368,978 B2 (Samsung Electronics Co., Ltd) published on 21 Jun. 2022, in which a technology of managing a random access channel configuration in a wireless communication system is disclosed, is known from related art. The technology provides for the capability of early acquisition of a CSI only associated with analog beamforming, but does not support CSI acquisition for digital precoding. Hence, in the patent described technology, a DL transmission is still performed in a suboptimal manner.
While operating, the BS emits, using a beam sweeping operation, a plurality of Synchronization Signal/Physical Broadcast Channel (SS/PBCH) units in the surrounding space. The SS/PBCH unit usually includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a PBCH, and its Demodulation Reference Signal (DMRS).
Once the UE is being in the coverage area of the BS and detects the SS/PBCH unit emitted by it, the UE transmits, at operation S100 (
At operation S200 (
The RAR transmitted within the PRACH may be alternately referred to, including in the specification of the Standard (see, e.g., TS 38.213), as ‘Msg2.’ At least estimation of the random access preamble previously performed by the BS at operation S200 (
At operation S105 (
When the SRS request field value in the modified RAR received from the BS indicates that the UE should transmit the SRS, the UE at operation S110 (
Main functions that can be implemented through the RRC protocol include, but are not limited to, (1) broadcasting an AS (Access Stratum—a signaling layer related to an access medium and existing on a site between the UE and the BS) system information and/or a NAS (Non-Access Stratum—a signaling layer not related to an access medium and existing on a site between the UE and an Access and Mobility Management Function (AMF)), (2) transmitting paging messages of the UE, (3) setting up, supporting and disconnecting a RRC connection between the UE and the BS in a Radio Access Network (RAN), (4) managing a carrier aggregation, (5) managing a Dual Connectivity (DC) mode, i.e. the simultaneous connection of the UE to two BS (including two BS of different generations), (6) managing virtual Signaling Radio Bearers (SRBs) and virtual Data Radio Bearers (DRBs), (7) managing mobility (handover, cell selection parameters and radio access technology), (8) managing Quality of Service (QOS) parameters, (9) controlling the UE to perform radio measurements and reporting, (10) detecting a radio link failure and recovering the radio link, (11) performing the tasks associated with safety, etc.
The SRS at operation S110 may be transmitted over at least a portion of one or more Physical Resource Blocks (PRBs) scheduled in the modified RAR for PUSCH transmission. The bandwidth of 1 PRB is 180 kHz, 360 kHz, 720 kHz or 1.44 MHz depending on a Subcarrier Spacing (SCS) used, which in the 5G NR communication systems may take the values of 15 kHz, 30 kHz, 60 kHz and 120 kHz, respectively. One PRB consists of 12 successive subcarriers occupying said bandwidth, and one time slot (6 or 7 symbols of Orthogonal Frequency-Division Multiplexing (OFDM)). In the 5G NR communication systems, the slot duration is 1 ms for the subcarrier spacing being of 15 kHz. For large SCS values (30 kHz, 60 kHz, 120 kHz), the slot duration is shortened to 0.5 ms, 0.25 ms, and 0.125 ms, respectively. One PRB is usually the smallest resource allocation (grant) element designated by the BS planner. Each OFDM symbol on each of the subcarriers forms a Resource Element (RE), which is defined by a pair of values {k, l}, where k is a subcarrier number, l is a symbol number in a slot. In some situations, the subcarrier, slot, OFDM symbol, or even RE may also be considered and used as a resource distribution/allocation element.
The SRS at operation S110 may be transmitted in a subset of OFDM symbols of one or multiple PUSCH slots that are scheduled in the modified RAR for PUSCH transmission, for example, transmitting the RRC setup request within the PUSCH. In this case, said subset of OFDM symbols and the one or multiple PUSCH slots, or the RE subset corresponding thereto, may be indicated in the modified RAR. A configuration of the transmitted SRS may correspond to a predetermined configuration of the SRS of a predetermined set of configurations of the SRS that is signaled by a value indicated in the SRS request field when at least two bits are reserved and used for the value.
In response to receiving, from the UE, the RRC setup request, the BS together with the SRS performs, based on the received SRS, an uplink channel state estimation from the UE for acquiring a CSI, and sets up a RRC connection between the UE and the BS. The acquired CSI comprises, but is not limited to, a Rank Indicator (RI) providing a referral rank recommendation to be used or, in other way, a number of MIMO layers (spatial MIMO subchannels) that are preferably to be used for transmitting over the DL to the UE. According to the technology disclosed in the application, a spatial processing precoder of the BS and/or a Modulation and Coding Scheme (MCS) are calculated based on measurements of the SRS.
In one non-limiting example, a channel matrix can be estimated from the received SRS signals, and then, for the precoder, eigenvectors of the channel matrix corresponding to the main eigenvalues can be used. In other non-limiting examples, the precoder for MU-MIMO can be computed on the basis of a Minimum Mean Square Error (MMSE) or a maximum of a Signal-to-Leakage-and-Noise Ratio (SLNR). In yet another non-limiting example, the precoder for MU-MIMO can be computed using a Zero Forcing (ZF) technique. The MCS, in a non-limiting example, may be selected according to a SNR ratio for the UE obtained by estimation at the side of the BS. This estimation is conducted using a BS calculated precoding, a channel matrix estimation obtained by the BS based on measurements of the SRS, and a noise and interference level information at the side of the UE that can be obtained from the CQI.
How exactly the uplink channel state estimation is conducted and what particularly is included in the CSI is predetermined in the specification of the currently existing Standard (see e.g. TS 38.213) or may be predetermined in a specification of any other communication standard to be developed in the future (e.g., in a specification or modification of the Standard related to the sixth generation (6G) communication technology).
Once the CSI is acquired, the BS may perform at one or more subsequent S215 operations one or multiple subsequent downlink transmissions to the UE with adaptive spatial signal processing performed on the basis of the acquired CSI. In addition, once the CSI is acquired, the BS may transmit the acquired CSI to the UE to perform also the adaptive spatial processing of any signal transmitted from the UE to the BS. The adaptive spatial signal processing includes at least hybrid analog and digital beamforming and SM. As the analog beamforming, digital beamforming, and SM procedures (see, e.g., Section 7.3.1.3 of the TS 38.211 Specification) as such are known from related art, their detailed description is not given here to provide the accuracy and brevity of description of particulars of namely the disclosure.
Any subsequent transmission from the BS to the UE over the PDSCH may be performed with contention resolution between the transmissions, and any of such contention resolution transmissions may be alternately referred to, including in the specification of the Standard, as ‘Msg4.’ A non-limiting example of one or multiple subsequent downlink transmissions to the UE with adaptive spatial signal processing is PDSCH transmission for setting up a RRC connection to the UE. Setting up the RRC connection to the UE may include setting up at least one SRB and/or at least one DRB. Other non-limiting examples of one or multiple subsequent downlink transmissions to the UE with adaptive spatial signal processing are transmission for reconfiguring the RRC connection, transmission for the SRS/CSI request, CSI transmission, or transmission of any other data or service signals over the PDSCH.
In turn, the UE at operation S115 receives the one or multiple subsequent downlink transmissions from the BS with adaptive spatial signal processing performed on the basis of the CSI acquired due to measurements of the SRS performed at the side of the BS. Thus, the communication between the BS and the UE may be performed with adaptive spatial signal processing (i.e. in an optimal manner) starting from the operation S215 described above. In other words, the disclosure provides a smaller delay before the moment when the full CSI is available, with all the ensuing technical advantages, one of which is a quicker transition to adaptive spatial processing of any signals (including service signals and data) transmitted between the BS and the UE.
As indicated above, this message is transmitted at operation S205 from the BS to the UE.
The UL grant field may include, at the lower level of the structure shown in
According to one possible implementation, when the SRS request field value indicates that the UE should transmit the SRS (e.g., the SRS request field=‘1’) but the SRS TPC field is not comprised in the received RAR, the SRS is transmitted at a power indicated (e.g., in the form of index in the set of predetermined transmit power values) for transmitting over the PUSCH in the TPC field described above (see the field (5) described above). The values of the flag (1) and fields (2)-(6) and/or the methods for their determination may be predetermined in the specification of the currently existing Standard (see e.g. TS 38.213) or may be predetermined in a specification of any other communication standard to be developed in the future (e.g., in a specification or modification of the Standard related to the sixth generation (6G) communication technology.
Referring to
The SRS grant field may include, at the lower level of the structure shown in
Let is consider, in detail, the possible specific variants of bit values of the SRS request field and the non-limiting configurations of the SRS with reference to Tables 1 to 3 and
As seen from the above Tables 1 to 3, the capability of determining one or another configuration of the SRS by a value of the SRS request field appears only when said value comprises not less than two bits. In other words, when a value of the SRS request field comprises one bit, transmitting the SRS is signaled merely with one predetermined configuration of the SRS. It should be understood that the specific bit values and what they signal (i.e., what is indicated in the column ‘Description’ in Tables 1 to 3 above) may be predetermined otherwise. In addition, it should be understood that which particular configuration of the SRS is assumed by one or another particular predetermined configuration of the SRS may be predetermined in the specification of the currently existing Standard (see e.g. TS 38.213) or may be predetermined in a specification of any other communication standard to be developed in the future (e.g., in a specification or modification of the Standard related to the sixth generation (6G) communication technology). The “predetermined configuration of the SRS” as such may include any configuration that may be signaled by the content of the ‘SRS request’ field and optionally the SRS TPC field described above with reference to
The disclosure also provides (1) a UE communicating in a communication network, the UE configured to perform the communication method in accordance with the first aspect of the disclosure or in accordance with any further implementation of the first aspect of the disclosure, (2) a BS communicating in a communication network, the BS configured to perform the communication method in accordance with the third aspect of the disclosure or in accordance with any further implementation of the third aspect of the disclosure, and (3) a communication system comprising a plurality of UEs and a plurality of BSs, wherein said plurality of UEs and said plurality of BSs are configured to communicate with each other in this communication system. As various hardware configurations of the UE and the BS that may be used to implement the communication method in accordance with any aspect of the disclosure or in accordance with any further implementation of such any aspect of the disclosure are known from related art, their detailed description is not given herein.
In one non-limiting implementation of the UE according to the disclosure, the UE may include, among other traditional software (e.g., an operating system, etc.) and hardware components (e.g., a screen, an input/output (I/O) interface, a power source, etc.), a transmit unit (e.g., an antenna) configured to transmit a random access preamble within a PRACH, a receive unit (e.g., an antenna) configured to receive a RAR within a PDSCH, the RAR comprising a SRS request field whose value indicates whether the UE should transmit the SRS, a determination unit (e.g., a processor or another computing means) configured to determine, based on a value of the SRS request field, whether the UE should transmit the SRS. In the case if the determination unit determines that the UE should transmit the SRS, said transmit unit available in the UE may be further configured to transmit the SRS, and said receive unit available in the UE may be further configured to receive one or multiple subsequent downlink transmissions with adaptive spatial signal processing performed by the BS on the basis of the CSI acquired on the basis of measurements of the SRS. Some of the above-mentioned units may be combined into a smaller number of units, for example, the receive unit and the transmit unit may be combined into a transceiver unit, etc.
In one non-limiting implementation of the BS according to the disclosure, the BS may include, among other traditional software (e.g., an operating system, etc.) and hardware components (e.g., a screen, an input/output (I/O) interface, a power source, etc.), a receive unit (e.g., an antenna) configured to receive, from the UE, a random access preamble within a PRACH, a transmit unit (e.g., an antenna) configured to transmit a RAR within a PDSCH, the RAR comprising a SRS request field whose value indicates whether the UE should transmit the SRS, a determination and indication unit (e.g., a processor or another computing means) configured to (i) determine whether the UE should transmit the SRS based on one or more criteria (e.g., but not limited to, the criteria associated with the random access preamble or with the quality of its reception at the side of the BS) and (ii) indicate, based on said determination, a corresponding value in the SRS request field (to be included in the RAR transmitted to the UE), a CSI estimation unit (e.g., a processor or another computing means) configured to acquire a CSI based on measurements of the SRS received from the UE, and an adaptive signal spatial processing unit (e.g., a processor or another computing means) configured to perform adaptive spatial processing of any signal to be transmitted to the UE based on the CSI acquired on the basis of measurements of the SRS received from the UE. Accordingly, the transmit unit may be further configured to perform one or multiple subsequent downlink transmissions with adaptive spatial signal processing based on the CSI acquired on the basis of measurements of the received SRS. Some of the above-mentioned units may be combined into a smaller number of units, for example, the receive unit and the transmit unit may be combined into a transceiver unit, etc.
The technical advantages of the disclosure is, depending on the embodiment, at least one of the following: early CSI acquisition during the IA procedure (i.e., acquiring a full CSI with a lower delay), that provides the capability of earlier digital precoding in the BS; the capability of use (operating) during other network communication procedures: a handover procedure, a radio link failure recovery procedure, or beam failure detection and recovery procedure; a more effective subsequent DL transmission, i.e., an enhanced signal-noise ratio of the signal received in the UE, support for multiple MIMO layers per each UE, support of multi-user and/or massive MIMO, extended cell coverage, reduced undesired interference to the UEs in other cells.
According to an embodiment, the method may include transmitting, at operation S100, a random access preamble within a Physical Random Access Channel (PRACH).
According to an embodiment, the method may include receiving at operation S105, within a Physical Downlink Shared Channel (PDSCH), a Random Access Response (RAR) to the random access preamble comprising a Sounding Reference Signal (SRS) request field whose value indicates whether the UE should transmit the SRS.
According to an embodiment, the method may include if the SRS request field value indicates that the UE should transmit the SRS, transmitting, at operation S110, the SRS.
According to an embodiment, the method may include receiving, at operation S115, one or multiple subsequent downlink transmissions with adaptive spatial signal processing performed on the basis of a Channel State Information (CSI) acquired on the basis of measurements of the SRS.
According to an embodiment, the network communication procedure may be an initial access procedure, a handover procedure, a radio link failure recovery procedure, or a beam failure detection and recovery procedure.
According to an embodiment, the received RAR may further include an SRS Transmit Power Control (TPC) field whose value indicates a transmit power for the SRS.
According to an embodiment, if the SRS request field value indicates that the UE should transmit the SRS but the SRS TPC field is not comprised in the received RAR, the SRS may be transmitted at a power indicated for a Physical Uplink Shared Channel (PUSCH).
According to an embodiment, the SRS may be transmitted together with a Radio Resource Control (RRC connection) setup request.
According to an embodiment, if the SRS request field value indicates that the UE should transmit the SRS, the value may further indicate a predetermined configuration of the SRS.
According to an embodiment, if the SRS request field value indicates that the UE should not transmit the SRS, the RRC setup request only may be transmitted.
According to an embodiment, the SRS may be transmitted to a portion of Physical Resource Blocks (PRBs) scheduled by the RAR for PUSCH transmission.
According to an embodiment, the received RAR may include indication of a PRB for transmitting the SRS.
According to an embodiment, the SRS and the RRC setup request within PUSCH may be transmitted at a transmit power whose value is indicated in the TPC field in the received RAR.
According to an embodiment, the received RAR may further include a TPC field of the RRC setup request whose value indicates a transmit power for the RRC setup request.
According to an embodiment, the power value indicated in the SRS TPC field may be different from the power value indicated in the RRC setup request TPC field.
According to an embodiment, the SRS may be transmitted within the same PUSCH slot as the RRC setup request is transmitted.
According to an embodiment, the received RAR may include indication of a slot for the SRS.
According to an embodiment, the received RAR may include indication of symbols in the slot for the SRS.
According to an embodiment, the SRS may be transmitted from one or multiple antennas of the UE, wherein a number of the UE antennas used for transmitting the SRS is indicated in the received RAR.
According to an embodiment, the received RAR may include indication of a group of subcarriers for the SRS.
According to an embodiment, the received RAR may include indication of a cyclic shift for the SRS.
According to an embodiment, the received RAR may include indication of a signal sequence for the SRS.
According to an embodiment, one or multiple SRS parameters defining the SRS may be predetermined in a standard specification.
According to an embodiment, a User Equipment (UE) for communicating in a communication network may be provided.
According to an embodiment, the UE may be configured to perform the communication method according any one of the embodiments.
According to an embodiment, the method may include receiving at operation S200 from a User Equipment (UE) a random access preamble within a Physical Random Access Channel (PRACH).
According to an embodiment, the method may include transmitting at operation S205, within a Physical Downlink Shared Channel (PDSCH), a Random Access Response (RAR) to the random access preamble comprising a Sounding Reference Signal (SRS) request field whose value indicates whether the UE should transmit the SRS.
According to an embodiment, the method may include if the SRS request field value indicates that the UE should transmit the SRS, receiving, at operation S210, the SRS.
According to an embodiment, the method may include performing, at operation S215, one or multiple subsequent downlink transmissions with adaptive spatial signal processing performed on the basis of a Channel State Information (CSI) acquired on the basis of measurements of the received SRS.
According to an embodiment, wherein the network communication procedure may be an initial access procedure, a handover procedure, a radio link failure recovery procedure, or a beam failure detection and recovery procedure.
According to an embodiment, the transmitted RAR may further include an SRS Transmit Power Control (TPC) field whose value indicates a transmit power for the SRS.
According to an embodiment, if the SRS request field value indicates that the UE should transmit the SRS but the SRS TPC field is not comprised in the transmitted RAR, the SRS may be received at a power indicated for a Physical Uplink Shared Channel (PUSCH).
According to an embodiment, the SRS may be received together with a Radio Resource Control (RRC connection) setup request.
According to an embodiment, if the SRS request field value indicates that the UE should transmit the SRS, the value may further indicate a predetermined configuration of the SRS.
According to an embodiment, if the SRS request field value indicates that the UE should not transmit the SRS, the RRC setup request only may be received.
According to an embodiment, the SRS may be received on a portion of Physical Resource Blocks (PRBs) scheduled by the RAR for PUSCH transmission.
According to an embodiment, the transmitted RAR may include indication of a PRB for transmitting the SRS.
According to an embodiment, the SRS and the RRC setup request within PUSCH may be received at a power whose value is indicated in the TPC field in the transmitted RAR.
According to an embodiment, the transmitted RAR may further include a TPC field of the RRC setup request whose value indicates a transmit power for the RRC setup request.
According to an embodiment, the power value indicated in the SRS TPC field may be different from the power value indicated in the RRC setup request TPC field.
According to an embodiment, the SRS may be received within the same PUSCH slot as the RRC setup request is received.
According to an embodiment, the transmitted RAR may include indication of a slot for the SRS.
According to an embodiment, the transmitted RAR may include indication of symbols in the slot for the SRS.
According to an embodiment, the SRS may be received from one or multiple antennas of the UE, wherein a number of the UE antennas used for transmitting the SRS is indicated in the transmitted RAR.
According to an embodiment, the transmitted RAR may include indication of a group of subcarriers for the SRS.
According to an embodiment, the transmitted RAR may include indication of a cyclic shift for the SRS.
According to an embodiment, the transmitted RAR may include indication of a signal sequence for the SRS.
According to an embodiment, one or multiple SRS parameters defining the SRS may be predetermined in a standard specification.
According to an embodiment, a Base Station (BS) for communicating with a User Equipment (UE) in a communication network may be provided.
According to an embodiment, the BS may be configured to perform the communication method according to any one of embodiments.
According to an embodiment, a communication system including a plurality of the User Equipments (UEs) according to an embodiment and a plurality of the Base Stations (BSs) according to an embodiment may be provided.
According to an embodiment, the plurality of UEs and the plurality of BSs may be configured to communicate with each other in the communication system.
Referring to
The electronic device 900 may correspond to the UE described above.
The aforementioned components will now be described in detail.
The processor 910 may include one or more processors or other processing devices that control the proposed function, process, and/or method. Operation of the electronic device 900 may be implemented by the processor 910.
The transceiver 920 may include a RF transmitter for up-converting and amplifying a transmitted signal, and a RF receiver for down-converting a frequency of a received signal. However, according to another embodiment, the transceiver 920 may be implemented by more or less components than those illustrated in components.
The transceiver 920 may be connected to the processor 910 and transmit and/or receive a signal. The signal may include control information and data. In addition, the transceiver 920 may receive the signal through a wireless channel and output the signal to the processor 910. The transceiver 920 may transmit a signal output from the processor 910 through the wireless channel.
The memory 930 may store the control information or the data included in a signal obtained by the electronic device 900. The memory 930 may be connected to the processor 910 and store at least one instruction or a protocol or a parameter for the proposed function, process, and/or method. The memory 930 may include read-only memory (ROM) and/or random access memory (RAM) and/or hard disk and/or compact disc (CD)-ROM and/or digital versatile disc (DVD) and/or other storage devices.
Referring to
The base station 1000 may correspond to the gNB described above.
The aforementioned components will now be described in detail.
The processor 1010 may include one or more processors or other processing devices that control the proposed function, process, and/or method. Operation of the base station 1000 may be implemented by the processor 1010.
The transceiver 1020 may include a RF transmitter for up-converting and amplifying a transmitted signal, and a RF receiver for down-converting a frequency of a received signal. However, according to another embodiment, the transceiver 1020 may be implemented by more or less components than those illustrated in components.
The transceiver 1020 may be connected to the processor 1010 and transmit and/or receive a signal. The signal may include control information and data. In addition, the transceiver 1020 may receive the signal through a wireless channel and output the signal to the processor 1010. The transceiver 1020 may transmit a signal output from the processor 1010 through the wireless channel.
The memory 1030 may store the control information or the data included in a signal obtained by the base station 1000. The memory 1030 may be connected to the processor 1010 and store at least one instruction or a protocol or a parameter for the proposed function, process, and/or method. The memory 1030 may include read-only memory (ROM) and/or random access memory (RAM) and/or hard disk and/or CD-ROM and/or DVD and/or other storage devices.
The disclosure can be used in a BS employing a massive MIMO antenna technology with a very high number of digital antenna ports (e.g., ≥128). The disclosure can be deployed to operate in an upper part of a medium frequency band (10-12 GHz), but can be used in other frequency bands, can support the operation in a Time Division Duplex (TDD), and can comply with the 3rd Generation Partnership Project (3GPP) specification. In addition, the disclosure can be used in a wireless system employing advanced transmission schemes with multiple MIMO layers per UE and BS.
While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of this disclosure as defined by the appended claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023102360 | Feb 2023 | RU | national |
