Patent Application
20240381365
The present disclosure generally relates to a wireless communication system, and more specifically, to an apparatus and a method for transmitting feedback information in the communication system.
To satisfy a wireless data traffic demand which is growing after a 4th generation (4G) communication system is commercialized, efforts are exerted to develop an advanced 5th generation (5G) communication system or a pre-5G communication system. For this reason, the 5G communication system or the pre-5G communication system is referred to as a beyond 4G network communication system or a post long term evolution (LTE) system.
To achieve a high data rate, the 5G communication system considers its realization in an extremely high frequency (mmWave) band (e.g., 60 GHz band). To mitigate a path loss of propagation and to extend a propagation distance in the extremely high frequency band, the 5G communication system is discussing beamforming, massive multiple input multiple output (MIMO), full dimensional (FD)-MIMO, array antenna, analog beam-forming, and large scale antenna techniques.
Also, for network enhancement of the system, the 5G communication system is developing techniques such as evolved small cell, advanced small cell, cloud radio access network (RAN), ultra-dense network, device to device (D2D) communication, wireless backhaul, moving network, cooperative communication, coordinated multi-points (COMP), and receive interference cancellation.
Besides, the 5G system is developing hybrid frequency shift keying and quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM) schemes, and filter bank multi carrier (FBMC), non orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access technologies.
A sidelink indicates a communication scheme in which a terminal communicates directly with other terminal without going through a base station. The terminal may transmit data and control information to other terminal through the sidelink, and receive data and control information from other terminal. In addition, the terminal which performs the sidelink communication may be located within coverage of the base station, wherein the terminal may also perform communication with the base station.
In a wireless communication system (e.g., a new radio (NR) system), a receiving device may receive from a transmitting device data according to data transmission to the receiving device, and then transmit hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback information for the data to the transmitting device. For example, in downlink data transmission, a terminal transmits to a base station HARQ-ACK feedback information for data transmitted from the base station in a configured resource. Even in sidelink data transmission, a receiving terminal may transmit HARQ-ACK feedback to a transmitting terminal. At this time, if the sidelink transmission is performed according to scheduling of the base station, the terminal transmitting the data may transmit whether the sidelink data transmission is successful, or information such as an amount of data to be transmitted by the terminal through the sidelink. For example, whether the sidelink data transmission is successful or the information such as the data amount to be transmitted by the terminal through the sidelink may be necessary information for the base station to schedule the sidelink transmission. If the terminal performing the sidelink data transmission transmits the sidelink feedback to the base station, it is necessary to transmit not only the sidelink feedback information but also other control information in an uplink. For example, HARQ-ACK for downlink data and control information such as channel state information (CSI) feedback for channel information carry may be transmitted together with the sidelink feedback information in the uplink.
Based on the discussions described above, the present disclosure provides an apparatus and a method for transmitting feedback information in a wireless communication system.
In addition, the present disclosure provides an apparatus and a method for a terminal to transmit feedback for sidelink data transmission to a base station in a wireless communication system.
In addition, the present disclosure provides an apparatus and a method for transmitting HARQ-ACK information for sidelink data in a wireless communication system.
In addition, the present disclosure provides an apparatus and a method for transmitting uplink control information related to feedback for sidelink data in a wireless communication system.
In addition, the present disclosure provides an apparatus and a method for a receiving terminal to transmit HARQ-ACK feedback to a transmitting terminal in data communication for sidelink group cast in a wireless communication system.
According to various embodiments of the present disclosure, an operating method of a terminal in a wireless communication system includes receiving sidelink feedback control information (SFCI) from other terminal, identifying a resource region for transmitting the SFCI to a base station, and transmitting control information comprising the SFCI and uplink control information (UCI) to the base station in the resource region.
According to various embodiments of the present disclosure, an operating method of a terminal in a wireless communication system includes receiving sidelink control information (SCI) comprising location information for at least one terminal, from other terminal, obtaining measurement information related to a signal strength received from the other terminal, and determining whether to transmit feedback information for sidelink groupcast data received from the other terminal, based on the location information and the measurement information.
According to various embodiments of the present disclosure, a terminal in a wireless communication system includes a transceiver for receiving SFCI, from other terminal, and at least one processor for identifying a resource region for transmitting the SFCI to a base station. The transceiver transmits control information comprising the SFCI and UCI to the base station in the resource region.
According to various embodiments of the present disclosure, a terminal in a wireless communication system includes a transceiver for receiving SCI comprising location information of at least one terminal, from other terminal, and at least one processor for obtaining measurement information related to a signal strength received from the other terminal, and determining whether to transmit feedback information for sidelink groupcast data received from the other terminal, based on the location information and the measurement information.
An apparatus and a method according to various embodiments of the present disclosure may transmit uplink control information (UCI) and sidelink feedback control information (SFCI) to a base station in the same resource region, and thus reduce resources used to transmit and/or receive feedback information.
An apparatus and a method according to various embodiments of the present disclosure may define a processing time for transmitting SFCI to a base station after receiving the SFCI in a sidelink, and thus acquire a sufficient processing time for a terminal to process the SFCI before transmitting the SFCI to the base station.
An apparatus and a method according to various embodiments of the present disclosure may prevent unnecessary resource assignment, by selectively transmitting feedback information of sidelink groupcast data to other terminal according to whether the sidelink groupcast data is valid information for the terminal.
Effects obtainable from the present disclosure are not limited to the above-mentioned effects, and other effects which are not mentioned may be clearly understood by those skilled in the art of the present disclosure through the following descriptions.
Terms used in the present disclosure are used for describing particular embodiments, and are not intended to limit the scope of other embodiments. A singular form may include a plurality of forms unless it is explicitly differently represented. All the terms used herein, including technical and scientific terms, may have the same meanings as terms generally understood by those skilled in the art to which the present disclosure pertains. The terms defined in a general dictionary among terms used in the present disclosure may be interpreted to have the same or similar meanings with the context of the relevant art, and, unless explicitly defined in this disclosure, it shall not be interpreted ideally or excessively as formal meanings. In some cases, even terms defined in this disclosure should not be interpreted to exclude the embodiments of the present disclosure.
In various embodiments of the present disclosure to be described below, a hardware approach is described as an example. However, since the various embodiments of the present disclosure include a technology using both hardware and software, the various embodiments of the present disclosure do not exclude a software-based approach.
Hereafter, the present disclosure relates to an apparatus and a method for transmitting and receiving feedback information in a wireless communication system. Specifically, the present disclosure explains a technique for transmitting hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback information for sidelink data transmission and information related to the HARQ-ACK feedback information in the wireless communication system.
Terms indicating signals, terms indicating channels, terms indicating control information, terms indicating network entities, and terms indicating components of an apparatus, which are used in the following descriptions, are for the sake of explanations. Accordingly, the present disclosure is not limited to the terms to be described, and may use other terms having technically identical meaning.
In addition, the present disclosure describes various embodiments using terms used in some communication standard (e.g., 3rd generation partnership project (3GPP)), which are merely exemplary for explanations. Various embodiments of the present disclosure may be easily modified and applied in other communication system.
It is assumed that the wireless communication system of the present disclosure may include a new radio (NR) system, and various embodiments of the present disclosure may be applied to the NR system. However, this is only an example for descriptions, and various embodiments of the present disclosure may be easily modified and applied to other communication system.
Hereinafter, various embodiments of the present disclosure are described in detail with reference to the accompanying drawings.
In describing the embodiments, technical contents well known in the technical field to which the present invention pertains and which are not directly related to the present invention are omitted in the descriptions. This is to more clearly provide the subject matter of the present invention by omitting unnecessary descriptions without obscuring the subject matter of the present disclosure.
For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. Also, a size of each component does not entirely reflect its actual size. The same reference number is given to the same or corresponding element in each drawing.
Advantages and features of the present invention, and a method for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, the embodiments are provided to only complete the disclosure of the present invention and to allow those skilled in the art to which the present invention pertains to fully understand a category of the invention, and the present invention is defined merely by the category of claims. The same reference numeral refers to the same element throughout the specifications.
At this time, it will be understood that each block of flowchart illustrations and combinations of the flowchart illustrations may be executed by computer program instructions. These computer program instructions may be mounted on a processor of a general-purpose computer, special-purpose computer, or other programmable data processing equipment, and accordingly instructions performed through the processor of the computer or other programmable data processing equipment create means for performing functions described in flowchart block(s). Since these computer program instructions may be stored in a computer usable or a computer readable memory which may aim for the computer or the other programmable data processing equipment to implement the function in a particular manner, the instructions stored in the computer usable or computer readable memory may produce a manufacture article including instruction means which conducts the function described in the flowchart block(s). Since the computer program instructions may also be loaded on the computer or the other programmable data processing equipment, a series of operational steps may be performed on the computer or the other programmable data processing equipment to generate a computer-executed process and the instructions performing the computer or the other programmable data processing equipment may provide steps for executing the functions described in the flowchart block(s).
Also, each block may represent a module, a segment or a portion of code including one or more executable instructions for executing specified logical function(s). It should also be noted that the functions mentioned in the blocks may occur out of sequence in some alternative implementations. For example, two blocks shown in succession may in fact be executed substantially simultaneously or the blocks may be sometimes executed in reverse order according to a corresponding function.
At this time, the term ‘˜ unit’ used in the present embodiment indicates software or a hardware component such as a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC), and ‘˜ unit’ performs specific tasks. However, ‘˜ unit’ is not limited to the software or the hardware. ‘˜ unit’ may be configured to be in an addressable storage medium or may be configured to reproduce one or more processors. Thus, as an example, ‘˜ unit’ includes components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, sub-routines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. Functionalities provided in the components and ‘˜ units’ may be combined into fewer components and ‘˜ units’ or may be further divided into additional components and ‘˜ units’. Besides, the components and ‘˜ units’ may be implemented to reproduce one or more central processing units (CPUs) within a device or a security multimedia card. In addition, ‘˜ unit’ may include one or more processors in an embodiment.
The base station 110 is a network infrastructure for providing radio access to the terminals 120 and 130. The base station 110 has coverage defined as a specific geographical area based on a signal transmission distance. The base station 110 may be referred to as, besides the base station, an access point (AP), an eNodeB (eNB), a gNodeB (gNB), a 5th generation node (5G node), a wireless point, a transmission/reception point (TRP), or other terms having a technically identical meaning.
The terminal 120 and the terminal 130 each are a device used by a user, and communicate with the base station 110 over a radio channel. In some cases, at least one of the terminal 120 and the terminal 130 may operate without user's involvement. That is, at least one of the terminal 120 and the terminal 130 is a device which performs machine type communication (MTC), and may not be carried by the user. The terminal 120 and the terminal 130 each may be referred to as, besides the terminal, a user equipment (UE), a mobile station, a subscriber station, a remote terminal, a wireless terminal, a user device, or other term having a technically equivalent meaning.
The base station 110, the terminal 120, and the terminal 130 may transmit and receive radio signals in a millimeter wave (mmWave) band (e.g., 28 GHz, 30 GHz, 38 GHz, 60 GHz). In so doing, to improve channel gain, the base station 110, the terminal 120, and the terminal 130 may conduct beamforming. Herein, the beamforming may include transmit beamforming and receive beamforming. That is, the base station 110, the terminal 120, and the terminal 130 may apply directivity to a transmit signal or a received signal. For doing so, the base station 110 and the terminals 120 and 130 may select serving beams 112, 113, 121, and 131 through a beam search or beam management procedure. After the serving beams 112, 113, 121, and 131 are selected, communications may be performed using resources which are quasi co-located (QCL) with resources which carry the serving beams 112, 113, 121, and 131.
Referring to
The wireless communication unit 210 may perform functions for transmitting and receiving signals over a radio channel. For example, the wireless communication unit 210 performs a conversion function between a baseband signal and a bit string according to a physical layer standard of the system. For example, in data transmission, the wireless communication unit 210 generates complex symbols by encoding and modulating a transmit bit string. Also, in data reception, the wireless communication unit 210 restores a receive bit string by demodulating and decoding a baseband signal.
Also, the wireless communication unit 210 up-converts the baseband signal to a radio frequency (RF) band signal, transmits it via an antenna, and down-converts an RF band signal received via an antenna to a baseband signal. For doing so, the wireless communication unit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and so on. In addition, the wireless communication unit 210 may include a plurality of transmit and receive paths. Further, the wireless communication unit 210 may include at least one antenna array including a plurality of antenna elements.
In terms of the hardware, the wireless communication unit 210 may include a digital unit and an analog unit, and the analog unit may include a plurality of sub-units according to an operating power and an operating frequency. The digital unit may be implemented with at least one processor (e.g., a digital signal processor (DSP)).
The wireless communication unit 210 transmits and receives the signals as stated above. Hence, whole or part of the wireless communication unit 210 may be referred to as ‘a transmitter’, ‘a receiver’, or ‘a transceiver’. Also, in the following explanations, the transmission and the reception over the radio channel is used as the meaning which embraces the above-stated processing of the wireless communication unit 210. In some embodiments, the wireless communication unit 210 may perform functions for transmitting and receiving a signal using wired communication.
The backhaul communication unit 220 provides an interface for communicating with other nodes in the network. That is, the backhaul communication unit 220 converts a bit sting transmitted from the base station to other node, for example, to other access node, other base station, an upper node, or a core network, to a physical signal, and converts a physical signal received from the other node to a bit string.
The storage unit 230 stores a basic program for operating the base station, an application program, and data such as setting information. The storage unit 230 may include a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. The storage unit 230 provides the stored data at a request of the control unit 240.
The control unit 240 controls general operations of the base station. For example, the control unit 240 transmits and receives signals through the wireless communication unit 210 or the backhaul communication unit 220. Also, the control unit 240 records and reads data in and from the storage unit 230. The control unit 240 may execute functions of a protocol stack requested by a communication standard. According to another embodiment, the protocol stack may be included in the wireless communication unit 210. For doing so, the control unit 240 may include at least one processor.
According to various embodiments, the control unit 240 may control the base station to perform operations according to various embodiments to be described.
Referring to
The communication unit 310 may perform functions for transmitting and receiving signals over a radio channel. For example, the communication unit 310 performs a conversion function between a baseband signal and a bit string according to a physical layer standard of the system. For example, in data transmission, the communication unit 310 generates complex symbols by encoding and modulating a transmit bit string. Also, in data reception, the communication unit 310 restores a receive bit string by demodulating and decoding a baseband signal. Also, the communication unit 310 up-converts the baseband signal to an RF band signal, transmits it via an antenna, and down-converts an RF band signal received via the antenna to a baseband signal. For example, the communication unit 310 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.
Also, the communication unit 310 may include a plurality of transmit and receive paths. Further, the communication unit 310 may include at least one antenna array including a plurality of antenna elements. In view of the hardware, the communication unit 310 may include a digital circuit and an analog circuit (e.g., an RF integrated circuit (RFIC)). Herein, the digital circuit and the analog circuit may be implemented as a single package. Also, the communication unit 310 may include a plurality of RF chains. Further, the communication unit 310 may perform the beamforming.
The communication unit 310 transmits and receives the signals as stated above. Hence, whole or part of the communication unit 310 may be referred to as ‘a transmitter’, ‘a receiver’, or ‘a transceiver’. In addition, the transmission and the reception over the radio channel are used as the meaning which embraces the above-stated processing of the communication unit 310 in the following explanations.
The storage unit 320 stores a basic program for operating the terminal, an application program, and data such as setting information. The storage unit 320 may include a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. The storage unit 320 provides the stored data according to a request of the control unit 330.
The control unit 330 controls general operations of the terminal. For example, the control unit 330 transmits and receives signals through the communication unit 310. Also, the control unit 330 records and reads data in and from the storage unit 320. The control unit 330 may execute functions of a protocol stack required by a communication standard. For doing so, the control unit 330 may include at least one processor or microprocessor, or may be part of a processor. In addition, part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP).
According to various embodiments, the control unit 330 may control the terminal to carry out operations according to various embodiments to be explained.
Referring to
The encoder and modulator 402 performs channel encoding. For the channel encoding, at least one of low density parity check (LDPC) code, convolution code, and polar code may be used. The encoder and modulator 402 generates modulation symbols by performing constellation mapping.
The digital beamformer 404 beamforms a digital signal (e.g., the modulation symbols). For doing so, the digital beamformer 404 multiplies the modulation symbols by beamforming weights. Herein, the beamforming weights are used to change an amplitude and a phase of the signal, and may be referred to as a ‘precoding matrix’ or a ‘precoder’. The digital beamformer 404 outputs the digital-beamformed modulation symbols to the plurality of the transmit paths 406-1 through 406-N. In so doing, according to a multiple input multiple output (MIMO) transmission scheme, the modulation symbols may be multiplexed, or the same modulation symbols may be provided to the plurality of the transmit paths 406-1 through 406-N.
The plurality of the transmit paths 406-1 through 406-N convert the digital-beamformed digital signals to analog signals. For doing so, the plurality of the transmit paths 406-1 through 406-N each may include an inverse fast Fourier transform (IFFT) operator, a cyclic prefix (CP) adder, a DAC, and an up-converter. The CP adder is used for an orthogonal frequency division multiplexing (OFDM) scheme, and may be excluded if other physical layer scheme (e.g., filter bank multi-carrier (FBMC)) is applied. That is, the plurality of the transmit paths 406-1 through 406-N provide an independent signal process for a plurality of streams generated through the digital beamforming. Yet, depending on the implementation, some of the components of the transmit paths 406-1 through 406-N may be used in common.
The analog beamformer 408 beamforms the analog signals. For doing so, the digital beamformer 404 multiplies the analog signals by the beamforming weights. Herein, the beamforming weights are used to change the amplitude and the phase of the signal. More specifically, the analog beamformer 408 may be configured variously, according to a connection structure between the plurality of the transmit paths 406-1 through 406-N and the antennas. For example, each of the plurality of the transmit paths 406-1 through 406-N may be connected to one antenna array. As another example, the plurality of the transmit paths 406-1 through 406-N may be connected to one antenna array. As yet another example, the plurality of the transmit paths 406-1 through 406-N may be adaptively connected to one antenna array, or two or more antenna arrays.
The wireless communication system not only provides an initial voice-oriented service, but also is evolving to, for example, a broadband wireless communication system which provides high-speed and high-quality packet data services such as high speed packet access (HSPA) of 3GPP, long term evolution (LTE), evolved universal terrestrial radio access (E-UTRA), and LTE-advanced (LTE-A), high rate packet data (HRPD) of 3GPP2, ultra mobile broadband (UMB), and/or institute of electrical and electronics engineers (IEEE) 802.16e communication standard. In addition, a communications standard of 5th generation (5G) or the NR as the 5G wireless communication system is being made.
The NR system which is a representative example of the broadband wireless communication system employs the OFDM scheme in downlink (DL) and uplink. More specifically, the NR system employed a cyclic-prefix OFDM (CP-OFDM) scheme for the DL, and CP-OFDM and discrete Fourier transform spreading OFDM (DFT-S-OFDM) schemes for the uplink. In various embodiments of the present disclosure, the uplink indicates a radio link on which the terminal transmits data or a control signal to the base station, and the DL indicates a radio link on which the base station transmits data or a control signal to the terminal. The multiple access scheme such as OFDM, CP-OFDM and/or DFT-S-OFDM described above, allocates and/or operates radio resources not to overlap time-frequency resources for carrying data or control information for each user with those of other user, that is, to establish orthogonality, and thus the data or the control information of each user is distinguished.
In addition, the NR system is designed to freely multiplex various services in the time and frequency resources, and accordingly a waveform, numerology, and/or a reference signal may be dynamically or freely allocated according to needs of a corresponding service in the NR system. To provide an optimal service to the terminal in the wireless communication, optimized data transmission based on measurements of channel quality and interference amount is important, and accurate channel measurement is essential for the optimized data transmission. However, since a 5G channel considerably changes in channel and interference characteristics depending on the service unlike a 4G channel which does not significantly change in channel and interference characteristics depending on the frequency resource, it is necessary to support a subset of a frequency resource group (FRG) unit for measuring the channel and interference characteristics on a specific frequency basis.
Meanwhile, types of services supported in the NR system may be divided into categories such as enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable and low-latency communications (URLLC). For example, the eMBB may be a service targeting a high-speed transmission of high-capacity data, the mMTC may be a service targeting terminal power minimization and connections multiple terminals, and the URLLC may be a service targeting high reliability and low latency. Different requirements may be applied according to the type of the service applied to the terminal. As mentioned above, a plurality of services may be provided to a user in the communication system, and an apparatus and a method for providing each service within the same time period according to the characteristics of each service are demanded to provide the plurality of the services to the user.
If decoding failure for data occurs in initial transmission, the NR system employs a hybrid automatic repeat request (HARQ) scheme which retransmits corresponding data in a physical layer. If the receiving device fails to accurately decode data, the HARQ scheme allows the receiving device to transmit negative acknowledgment (NACK) notifying the decoding failure to the transmitting device so that the transmitting device may retransmit the corresponding data in the physical layer. The receiving device may improve data reception performance by combining the data retransmitted by the transmitting device with the data previously failed in decoding. In addition, if the receiving device correctly decodes the data, the HARQ scheme allows the receiving device to transmit information (acknowledgment (ACK)) notifying the decoding success to the transmitting device so that the transmitting device may transmit new data.
Referring to
A basic unit of the resource in the time-frequency domain may be a resource element (RE) 512, and an RE 502 may be represented by an OFDM symbol index and a subcarrier index. A resource block (RB) or a physical resource block (PRB) 508 may be defined as one OFDM symbol in the time domain and NRB-ary subcarriers in the frequency domain. Hence, one RB 508 may include NRB-ary RE 512. In various embodiments, a minimum transmission unit of data may be the RB. Nsymb=14 and NRB=12 in the NR system, and NBW and NRB are proportional to the bandwidth of the system transmission band. A data rate may increase in proportion to the number of RBs scheduled to the terminal.
In frequency division duplex (FDD) in which the DL and the uplink are distinguished by the frequency in the NR system, a downlink transmission bandwidth and an uplink transmission bandwidth may be different from each other. A channel bandwidth represents a radio frequency (RF) bandwidth corresponding to the system transmission bandwidth. Table 1 and Table 2 show correspondence between the system transmission bandwidth defined in the NR system, the subcarrier spacing (SCS) and the channel bandwidth in a frequency band lower than 6 GHz and a frequency band higher than 6 GHz.
For example, if the SCS is 30 kHz and the channel bandwidth is 100 MHz, the transmission bandwidth may include 273 RBs. N/A in <Table 1> and <Table 2> may correspond to a bandwidth-subcarrier combination which is not supported in the NR system. Scheduling information for downlink data or uplink data in the NR system may be transmitted from the base station to the terminal through downlink control information (DCI). The DCI is defined according to various formats, each format may indicate that the DCI is scheduling information (e.g., UL grant) of uplink data, scheduling information (DL grant) of DL data, compact DCI having small-sized control information, DCI for applying spatial multiplexing using multiple antennas, or DCI for power control. For example, the DCI format 1-1 which is the scheduling control information (DL grant) of the DL data may include at least one following control information:
For example, in the data transmission through a physical uplink shared channel (PUSCH), the time domain resource assignment may indicate information of the slot transmitting the PUSCH, and a start symbol position S in a corresponding slot and the number L of symbols to which the PUSCH is mapped. Herein, S may be a relative position from the start of the slot, L may be the number of consecutive symbols, and S and L may be determined from a start and length indicator value (SLIV). For example, if (L−1)≤7, SLIV=14·(L−1)+S, otherwise SLIV=14·(14−L+1)+ (14−1−S). Herein, 0<L≤14−S may be satisfied.
The terminal in the NR system may receive slot information in the form of a table indicating a SLIV value, a PUSCH mapping type, and a PUSCH in one row, through radio resource control (RRC) configuration. Next, the base station may transmit to the terminal the DCI including the time domain resource assignment indicating the index value in the configured table, and thus carry the information of the slot transmitting the SLIV value, the PUSCH mapping type, and the PUSCH to the terminal.
In the NR system, the PUSCH mapping type may include a type A and a type B. According to the PUSCH mapping type A, a first symbol of demodulation reference signal (DMRS) symbols is positioned in a second or third OFDM symbol of the slot. According to PUSCH mapping type B, the first symbol of the DMRS symbols is positioned in the first OFDM symbol in the time domain resource assigned for PUSCH transmission.
The DCI may be transmitted on a physical downlink control channel (PDCCH) through channel coding and modulation. According to various embodiments of the present disclosure, transmitting the control information via the PDCCH or the PUCCH may be expressed as transmitting the PDCCH or the PUCCH. Similarly, transmitting data via the PUSCH or the PDSCH may be expressed as transmitting the PUSCH or the PDSCH.
Cyclic redundancy check (CRC) scrambled with a specific radio network temporary identifier (RNTI) (or terminal identifier) is added to the DCI independently for each terminal, channel coding is applied to the DCI, and then the DCI is configured and transmitted as an individual independent PDCCH. The PDCCH may be mapped and transmitted in a control resource set (CORESET) configured to the terminal.
DL data may be transmitted on a physical downlink shared channel (PDSCH) which is a physical channel for downlink data transmission. The PDSCH may be transmitted after the control channel transmission period, and scheduling information such as a specific mapping position in the frequency domain and a modulation scheme for the PDSCH may be determined based on the DCI transmitted through the PDCCH.
Through the MCS among the control information including the DCI, the base station may notify the terminal of the modulation scheme applied to the PDSCH to transmit and the data size (a transport block size, TBS) to transmit. In various embodiments, the MCS may include 5 bits or more or fewer bits. The TBS corresponds to a TB size before the channel coding for error correction is applied to the data (a transport block, TB) to be transmitted by the base station.
In various embodiments, the TB may include at least one of a medium access control (MAC) header, a MAC control element (CE), one or more MAC service data units (SDUs), and padding bits. Alternatively, the TB may indicate a data unit or a MAC protocol data unit (PDU) delivered from the MAC layer to the physical layer.
The modulation schemes supported in the NR system may include quadrature phase shift keying (QPSK), quadrature amplitude modulation (16QAM), 64QAM, and 256QAM, and each modulation order (Qm) corresponds to 2, 4, 6, and 8. That is, 2 bits per symbol in the QPSK modulation, 4 bits per symbol in the 16QAM modulation, 6 bits per symbol in the 64QAM modulation, and 8 bits per symbol in the 256QAM modulation may be transmitted.
In various embodiments of the present disclosure, the terms of the physical channel and the signal may be used interchangeably with the data or the control signal. For example, the PDSCH is the physical channel carrying data, but the PDSCH may be referred to as data in the present disclosure.
In various embodiments of the present disclosure, higher layer signaling indicates signal delivery from the base station to the terminal through the DL data channel of the physical layer or from the terminal to the base station through the UL data channel of the physical layer, and may include, for example, RRC signaling or MAC CE signaling.
Referring to
Referring to
In various embodiments, a length of a transmission time interval (TTI) used for the transmission of the URLLC data 710, 712, and 714 may be shorter than a length of a TTI used for the transmission of the eMBB data 708 or the mMTC data 716. In addition, a response of information related to the URLLC may be transmitted more promptly than a response of information related to the eMBB or information related to the mMTC, and accordingly, the information related to the URLLC may be transmitted with low latency. A structure of a physical layer channel used for each service or data may be different to transmit the abovementioned three services or data (e.g., eMBB, URLLC, and mMTC). For example, at least one of the TTI length, a frequency resource assignment unit, a control channel structure or a data mapping method may be different.
In
Hereinafter, a method and an apparatus for performing data communication between a base station and a terminal or terminals are provided. In various embodiments of the present disclosure, a data transmission type may include transmitting data from one terminal to a plurality of terminals, or transmitting data from one terminal to one terminal. Alternatively, the data transmission type may include transmitting data from a base station to a plurality of terminals. However, various embodiments of the present disclosure are not limited to the above-described types, and various modifications are possible.
Referring to
Referring to
The terminal 901 transmitting the groupcast signal may be other terminal in the group, and resource assignment for the groupcast signal transmission may be provided by the base station, or provided by a terminal serving as a leader in the group, or determined by the terminal 901 itself. In various embodiments, the terminals 901, 903, 907, 905, 909, 911, and 913 may include a vehicle terminal. In addition, separate control information, a physical control channel, and/or data may be transmitted for the groupcast transmission.
Referring to
In various embodiments of the present disclosure, the sidelink may be interchangeably used with PC5, vehicle to everything (V2X) or device to device (D2D).
Referring to
In various embodiments, a frequency band of 20 RBs to which the SS/PBCH block is mapped may change according to the SCS. For example, if the SCS is 15 kHz, the frequency band to which the SS/PBCH block is mapped is 3.6 MHz. As another example, if the SCS is 30 kHz, the frequency band to which the SS/PBCH block is mapped is 7.2 MHz. As another example, if the SCS is 120 kHz, the frequency band to which the SS/PBCH block is mapped is 28.8 MHz. As another example, if the SCS is 240 kHz, the frequency band to which the SS/PBCH block is mapped is 57.6 MHz.
Referring to
Referring to
For example, if the SCS is 15 kHz 1301, an index of a first symbol of the SS/PBCH block within 1 ms may be {2, 8}.
For example, if the SCS is 30 KHz 1303, the index of the first symbol of the SS/PBCH block within 1 ms may be {4, 8} in the first slot and {2, 6} in the second slot.
For example, if the SCS is 30 kHz 1305, the index of the first symbol of the SS/PBCH block within 1 ms may be {2, 8} in the first slot and {2, 8} in the second slot.
For example, the SCS of the SS/PBCH block may not be 60 kHz 1307.
For example, if the SCS is 120 kHz, the index of the first symbol of the SS/PBCH block within 0.25 ms may be {4, 8} in the first slot and {2, 6} in the second slot.
For example, if the SCS is 240 kHz, the index of the first symbol of the SS/PBCH block within 0.25 ms may be {8, 12} in the first slot, {2, 6} in the second slot, {4, 8, 12} in the third slot, and 2 in the fourth slot.
In various embodiments, the positions of the symbols for carrying the SSB may be configured in the terminal through system information or dedicated signaling.
Referring to
In various embodiments of the present disclosure, a sidelink control channel may be referred to as a physical sidelink control channel (PSCCH), and a sidelink shared channel or data channel may be referred to as a physical sidelink shared channel (PSSCH). In addition, a broadcast channel broadcast with an SS may be referred to as a physical sidelink broadcast channel (PSBCH), and a channel for transmitting feedback information may be referred to as a physical sidelink feedback channel (PSFCH). In various embodiments, the PSCCH or the PSSCH may be used to transmit feedback information. In various embodiments, the PSCCH and the PSSCH may be referred to as LTE-PSCCH, LTE-PSSCH, NR-PSCCH, or NR-PSSCH depending on the communication system (e.g., the NR system, the LTE system). In the present disclosure, the sidelink may indicate a link between terminals, and a Uu link may indicate a link between the base station and the terminal.
Various embodiments may be applied if the base station schedules data transmission of the sidelink for communication between terminals in the wireless communication system.
Definitions of terms used in various embodiments of the present disclosure are as follows:
“Sidelink” indicates a communication scheme in which the terminal communicates directly with other terminal without going through the base station.
“Sidelink data” indicates data transmitted on the sidelink. In various embodiments, “sidelink data” may have the same meaning as “sidelink transmission” and “sidelink data transmission,” and may be used interchangeably.
“Sidelink channel” indicates a channel between terminals which perform communication in the sidelink.
“Radio access channel” indicates a channel between the base station and the terminal.
“Channel state information (CSI)” indicates channel state information of the radio access channel. “Sidelink-CSI (SL-CSI)” indicates channel state information of the sidelink channel.
“Sidelink feedback information” indicates feedback information provided by a terminal receiving sidelink data to a terminal transmitting the sidelink data. For example, the sidelink feedback information may include at least one of CSI of the sidelink channel, HARQ-ACK feedback information for sidelink data, sidelink scheduling request (SL-SR), sidelink control information (SCI), or sidelink buffer status report (SL-BSR). In various embodiments, ‘sidelink feedback information’ may have the same meaning as “sidelink feedback information,” “sidelink feedback,” and “sidelink feedback control information (SFCI),” and may be used interchangeably. The SFCI may be transmitted through a physical sidelink feedback control channel (PSFCH).
“Feedback information for sidelink data” indicates sidelink feedback information related to the sidelink data. For example, the feedback information for the sidelink data may include HARQ-ACK feedback information for the sidelink data.
“HARQ-ACK” indicates information indicating whether the receiving terminal successfully receives data transmitted by the transmitting terminal to the receiving terminal. In various embodiments, “HARQ-ACK” may have the same meaning as “HARQ-ACK feedback,” “HARQ-ACK information,” and “HARQ-ACK feedback information,” and may be used interchangeably.
“Sidelink groupcast data” indicates sidelink data transmitted based on the groupcast scheme.
Referring to
Referring to
Referring to
If the terminal 1601 is being accessed to the base station 1611 (or the RRC connected state), the base station 1611 may configure one or more component carriers (CCs) for DL transmission to the terminal 1601. In addition, DL transmission, UL transmission slots and symbols may be configured in each CC. Meanwhile, if the PDSCH which is downlink data is scheduled, slot timing information to which the PDSCH is mapped in a specific bit field of the DCI, a position of a start symbol among symbols to which the PDSCH is mapped in the corresponding slot, and information related to the number of symbols to which the PDSCH is mapped may be transmitted. For example, if the DCI carried in slot n schedules the PDSCH, and K0 which is the slot timing information carrying the PDSCH indicates 0, the position of the start symbol is 0, and the number of the symbols is 7, the corresponding PDSCH may be mapped and transmitted from a 0-th symbol to 7 symbols of slot n. In various embodiments, to configure a time domain resource for the PDSCH transmission, a table (hereafter, may be referred to as a PDSCH resource assignment table) indicating information related to the start symbol of the PDSCH of the specific slot and the number of the symbols may be configured in the base station and/or the terminal, and the base station may indicate the time domain resource of the PDSCH to the terminal, by indicating the terminal an index value corresponding to the start symbol of the allocated PDSCH and the number of the symbols using DCI, in the PDSCH resource assignment table. In various embodiments, the PDSCH resource assignment table may be a fixed value, may be preset, and/or may be set by the higher layer signaling. The following <Table 3> is an example of the PDSCH resource assignment table indicating the slot information to which the PDSCH is mapped, the start symbol information, and the number or length information of symbols:
According to <Table 3>, up to 3 PDSCHs may be allocated in one slot. All the three PDSCHs may be related to transmission for one terminal, or may be related to transmission for different terminals respectively. The base station may transmit information together with the start symbol position of each PDSCH to the terminal through the higher layer signaling and/or the DCI. In various embodiments of the present disclosure, the length of the PDSCH or the PUSCH may indicate the number of OFDM symbols to which the PDSCH or PUSCH is mapped. In various embodiments, HARQ-ACK feedback may be transmitted from the terminal to the base station after K1 slot from the transmission of the downlink data signal PDSCH. K1 information which is timing information for transmitting the HARQ-ACK feedback may be carried by the DCI. For example, a candidate set of possible K1 values may be carried by the higher layer signaling, and one K1 value may be determined by the DCI from the candidate set.
The terminal may transmit HARQ-ACK information including HARQ-ACK feedback bits to the base station. In various embodiments, the HARQ-ACK feedback bits may also be referred to as a ‘HARQ-ACK codebook’.
According to an embodiment, the base station may configure to the terminal a semi-static HARQ-ACK codebook allowing the terminal to transmit the HARQ-ACK feedback bits corresponding to the PDSCH which may be transmitted at predetermined timing slot and symbol positions, regardless of the PDSCH transmission. According to the semi-static HARQ-ACK codebook, the number of uplink HARQ-ACK feedback bits to transmit regardless of the scheduling of the base station may be fixed. The semi-static codebook may be, or correspond to a type-1 HARQ-ACK codebook in the NR system.
According to another embodiment, the base station may configure to the terminal a dynamic HARQ-ACK codebook allowing the terminal to transmit the HARQ-ACK feedback bits corresponding to the transmitted PDSCH. In this case, the terminal may determine feedback bits and/or the number of the feedback bits based on a counter downlink assignment index (DAI) and/or a total DAI included in the DCI. According to the dynamic HARQ-ACK codebook, the number of the uplink HARQ-ACK feedback bits to transmit may be determined based on the scheduling information of the base station. The dynamic HARQ-ACK codebook may be or correspond to a type-2 HARQ-ACK codebook in the NR system.
If the terminal is configured with the semi-static HARQ-ACK codebook, the terminal may determine the feedback bits and/or the number of the feedback bits to transmit based on the PDSCH resource assignment table including the slot information to which the PDSCH is mapped, the start symbol information of the PDSCH, the number of symbols of the PDSCH and/or the PDSCH length information, and K1 candidate values which are the timing information of the HARQ-ACK feedback. The PDSCH resource assignment table including the slot information to which the PDSCH is mapped, the start symbol information of the PDSCH, the number of the symbols of the PDSCH or the PDSCH length information may have a default value, or may be configured to the terminal by the base station. In addition, the K1 candidate values which are the timing information of the HARQ-ACK feedback for the PDSCH may be a default value such as {1, 2, 3, 4, 5, 6, 7, 8}, or the base station may select a set of the K1 candidate values in the terminal. For example, the base station may configure the set of the K1 candidate values such as {2, 4, 6, 8, 10, 12, 14, 16} to the terminal, and one of these values may be indicated by the DCI.
If a set of candidate PDSCH reception occasions in a serving cell c is MA,c, MA,c may be determined based on the [pseudo-code 1] steps of <Table 4> as follows:
In various embodiments, the steps of the pseudo-code 1 may be executed as shown in pseudo-code 2 of <Table 5> as follows:
or an active UL BWP change on
or the active UL
is configured as UL where K1,k is the k-th slot timing value in set K
,
;
indicates data missing or illegible when filed
As shown in
The DL data transmission may be performed as follows. The base station transmits data to the terminal through the PDSCH. To transmit the PDSCH, the base station may transmit DCI including control information such as scheduling information to the terminal through the PDCCH, or pre-transmit the scheduling information through the higher layer signaling, and activate or deactivate persistent PDSCH transmission and/or semi-persistent PDSCH transmission through the PDCCH. To activate or deactivate the persistent or semi-persistent PDSCH transmission, the base station may indicate the activation or the deactivation to the terminal by setting values of specific bit fields of the DCI carried by the PDCCH to specific values.
The terminal may receive the PDSCH, and decode at least one TB carried in the PDSCH. The PDSCH may include one or two TBs, and each TB may be decoded using information such as MCS of scheduling information configured with the DCI or the higher layer signaling and resource assignment information. In addition, each TB may include one or more code blocks (CBs), and the CB may be a unit for performing channel coding and decoding. While decoding the CBs, the terminal may determine whether decoding each CB is successful or failed by checking CRC, and determine whether decoding the whole TB is successful or failed by checking CRC included in the TB. In various embodiments, if the CRC is not included in the CB, the terminal may determine whether decoding the CB is successful using the TB CRC.
Referring to
In various embodiments of the present disclosure, terms of CB group based retransmission, CBG based retransmission, partial retransmission, and CBG retransmission may be used interchangeably. In various embodiments, the number of CBGs configured from the base station to the terminal or the maximum number of the configured CBGs may be defined as N_{CBG,max}. Herein, N_{CBG,max} may be mixedly used with NCBG, max. In addition, the number of the CBs included in the scheduled TB may be defined as C. In this case, if the TB is scheduled, the number M of the CBGs may be determined as M=min (NCBG, max, C), and min (x, y) may indicate a smaller value of x and y. The C-ary CBs included in the TB may be grouped according to the following rules to configure M-ary CBGs:
Herein, ceil (C/M) or [C/M] denotes a minimum integer which is not smaller than C/M, and floor (C/M) or [C/M] denotes a maximum integer which is not greater than C/M. For example, if C/M is 4.3, ceil (C/M) is 5 and floor (C/M) is 4. According to the above rule, the CBs may be grouped sequentially from the previous CBG.
If the maximum number of the CBGs configured to the terminal is NCBG, max, the DCI transmitted to schedule the CBG based retransmission may include NCBG,max bits for CBG transmission information (CBGTI). In various embodiments, the CBGTI may indicate CBGs transmitted in current scheduling. For example, if the base station sets NCBG,max=4 to the terminal, one TB may include up to 4 CBGs, the DCI may include 4 bits for the CBGTI, and each bit may indicate whether each CBG may is transmitted or not. For example, if the CBGTI included in the DCI is 1111 and there are 4 CBGs, the CBGTI may indicate that all the CBGs are transmitted because each bit is 1. As another example, if the CBGTI included in the DCI is 1100 and there are 4 CBGs, the CBGTI may indicate that only first and second CBGs are transmitted.
The MAC protocol may allocate the TB received in the physical layer to a corresponding HARQ process. If the receiving device receives the TB and the scheduling information, if NDI of the corresponding HARQ process is toggled (or if the NDI is different from previously received NDI) or corresponding transmission is broadcast transmission, or if corresponding TB is transmitted first of all, the receiving device may regard the corresponding transmission as new transmission, and otherwise, may regard the corresponding transmission as retransmission.
The base station may inform the terminal of related configuration and indication information through the higher layer signaling and the physical layer control signal so that the terminal transmits HARQ-ACK information of the PDSCH to transmit in the downlink to the base station. In various embodiments, the HARQ-ACK information of the PDSCH may include at least one of TB based HARQ-ACK information for the TBs included in the PDSCH, or CBG based HARQ-ACK information if the CBG based retransmission and the feedback are configured. In various embodiments, the higher layer signaling may include at least one of MAC CE configuration and RRC configuration. The configuration information for the HARQ-ACK may include one or more of the following information:
In various embodiments, the above-described configuration information for the HARQ-ACK may also be applied to the sidelink data transmission. Referring to
In various embodiments, the terminal may simultaneously transmit the feedback for the sidelink data transmission to the base station as shown in
In
If the semi-static HARQ-ACK codebook is configured for the UCI transmission (i.e., if the number of the uplink HARQ-ACK feedback bits to transmit is fixed regardless of the scheduling of the base station 1711, or the type-1 HARQ-ACK codebook is configured in the NR system), and if the dynamic HARQ-ACK codebook is configured (i.e., if the number of the uplink HARQ-ACK feedback bits to transmit is determined based on the scheduling information of the base station 1711, or the type-2 HARQ-ACK codebook is configured in the NR system), the HARQ-ACK feedback for the sidelink data may be configured to be transmitted in the slot n for transmitting the UCI for each downlink serving cell configured in the terminal 1701.
In various embodiments, the sidelink feedback information may be appended to a rear or front portion of the HARQ-ACK feedback information for the downlink data. The number of bits of the sidelink feedback information may be determined based on a combination of one or more of the number of CWs configured for the sidelink transmission (i.e., the number of TBs transmitted in one physical channel, for example, one PSSCH), the sidelink transmission timing configured or indicated by the base station, timing for transmitting the sidelink feedback, timing information of when to transmit the sidelink feedback to the base station, or the number of sidelink serving cells configured for the sidelink communication.
Referring to
In various embodiments, a scheduling request for sidelink retransmission (or transmission) (hereafter, may be referred to as an SL-SR) may be applied instead of the bits 1903 of the HARQ-ACK feedback information for the sidelink data. In this case, the bits 1901 of the HARQ-ACK feedback information for the downlink data, and the SL-SR bits may be concatenated to configure the bits of the feedback information to transmit in the uplink. In other words, the bits 1901 of the HARQ-ACK feedback information for the downlink data and the SL-SR bits may be consecutive. In various embodiments, the SL-SR bits may be appended to the rear or front part of the bits 1901 of the HARQ-ACK feedback information for the downlink data, to be consecutive to the bits 1901 of the HARQ-ACK feedback information for the downlink data.
In various embodiments, if the terminal needs to transmit HARQ-ACK for downlink data in the uplink, the terminal may transmit only the HARQ-ACK for the downlink data in the uplink without transmitting the sidelink feedback information. In other words, the terminal may not transmit the sidelink feedback information to the base station even if receiving the sidelink feedback information from other terminal. Similarly, if the terminal needs to transmit CSI or SR in the uplink, the terminal may transmit only the CSI or the SR in the uplink without transmitting the sidelink feedback information.
In various embodiments, if the terminal needs to transmit the sidelink feedback information in the uplink, the terminal may transmit only the sidelink feedback information to the base station without transmitting the HARQ-ACK for the downlink data. In other words, after the terminal transmitting the sidelink data receives the feedback information for the sidelink data and/or the sidelink feedback information including the SL-SCI from the terminal receiving the sidelink data, the terminal may transmit the sidelink feedback information to the base station but may not transmit the UCI.
As mentioned above, after the CRC is added to the UCI and the UCI is encoded based on channel code such as polar code, the UCI including the feedback information for the downlink data and/or the feedback information for the sidelink data may be transmitted to the base station using the PUCCH format or the PUSCH in the resource pre-configured from the base station or determined based on the scheduling information. Whether the PUCCH or the PUSCH is used may be determined based on the number of the bits of the UCI and/or the uplink scheduling information.
According to the second embodiment, examples in which the terminal transmits HARQ-ACK information for sidelink data transmission to the base station by considering a signal processing time of the terminal in the RRC connected state are described.
In
For example, the processing time may be defined as N-ary symbols or Tmsec. N and T may be determined based on the SCS used for the sidelink transmission, the OFDM symbol length, the SCS used for the downlink and uplink transmission or the OFDM symbol length. As another example, N and T may be determined based on a combination of at least two of the SCS used for the sidelink transmission, the OFDM symbol length, the SCS used for the downlink and uplink transmission or the OFDM symbol length.
According to the third embodiment, examples of transmitting groupcast data in the sidelink and transmitting feedback such as HARQ-ACK for groupcast data or sidelink channel status report as shown in
Referring to
The terminals 2003, 2005, 2007, 2009, 2011, and 2013 in
The terminal may acquire measurement information based on a decoding reference signal (DMRS) for decoding at least one of the control information or data scheduled by the control information. In various embodiments, the measurement information may be obtained by measuring at least one of the following physical channels or physical signals:
In addition, in various embodiments, the measurement information may have the same meaning as the following terms, and may be replaced by the following terms:
In
For example, in
In various embodiments, the indication information may include the ID and/or the index value of the region to which the transmitting terminal transmitting the sidelink groupcast data belongs, and may be indicated by the SCI. The measurement information may include the ID and/or the index value of the region to which the receiving terminal belongs, determined by the receiving terminal receiving the sidelink groupcast data by measuring the location of the receiving terminal. If the indication information and the measurement information match, the receiving terminal may transmit the HARQ-ACK feedback to the transmitting terminal.
In various embodiments, the indication information may include x-axis and y-axis values of the region to which the transmitting terminal transmitting the sidelink groupcast data belongs, or (x, y) coordinate values indicating a combination of an index indicating east and west—an index indicating south and north, and the indication information may be indicated by the SCI. The measurement information may include x-axis and y-axis values of the region to which the receiving terminal belongs, determined by the receiving terminal receiving the sidelink groupcast data by measuring the location of the receiving terminal, or (a, b) coordinate values indicating a combination of the index indicating east and west—the index indicating south and north. The receiving terminal may determine whether to transmit the HARQ-ACK feedback, based on the indication information and the measurement information. For example, if an absolute value of a difference between x and a is smaller than N and an absolute value of a difference between y and b is smaller than M, the receiving terminal may transmit the HARQ-ACK feedback to the transmitting terminal. In other words, if |x−a|≤N and |y−b|≤M are satisfied, the receiving terminal may transmit the HARQ-ACK feedback to the transmitting terminal. As another example, if |x−a|<N and |y−b|<M are satisfied, the receiving terminal may transmit the HARQ-ACK feedback to the transmitting terminal. N and M may be the same value, or may be different values. In addition, N and M may be fixed values (e.g., 1). The fixed value is not limited to 1, and may be various values. In various embodiments, N and M may be set in the receiving terminal by the higher layer signaling from the base station and/or the transmitting terminal.
In various embodiments, the receiving terminal receiving the sidelink groupcast data may determine a time-frequency resource for transmitting the HARQ-ACK based on the measurement information. For example, resources configured in the receiving terminal may include a resource for the transmission of the PSFCH. The receiving terminal may determine a resource for transmitting the PSFCH including the HARQ-ACK feedback information based on the indication information and the measurement information. For example, if the ID and/or the index of the region in which the transmitting terminal transmitting the sidelink groupcast data is located, indicated by the indication information, and the ID and/or the index of the region in which the receiving terminal is located, indicated by the measurement information, match, the receiving terminal may transmit the PSFCH in PSFCH resource #1, and if they do not match, may transmit the PSFCH in PSFCH resource #2. The PSFCH resource #1 and the PSFCH resource #2 include the time-frequency resources, and may be preset in the transmitting terminal and the receiving terminal, may be configured by the higher layer signaling, or may be dynamically indicated by the DCI and/or the SCI.
According to the fourth embodiment, descriptions are made on examples for determining a feedback transmit power if a sidelink transmits groupcast data and transmits feedback such as HARQ-ACK for the groupcast data or sidelink channel state information as shown in
In
According to the fifth embodiment, descriptions are made on examples for determining a timing for carrying HARQ-ACK feedback of a sidelink to the base station according to scheduling of the base station.
In various embodiments, in the sidelink communication, the transmitting terminal may transmit data for unicast or groupcast to the receiving terminal, and the receiving terminal may transmit HARQ-ACK information for the received unicast or groupcast data to the transmitting terminal. The transmitting terminal in the mode 2 sidelink communication determines a resource for transmitting data without the scheduling of the base station, but the transmitting terminal in the mode 1 sidelink communication may receive scheduling information for scheduling the resource for the sidelink transmission from the base station, and perform the sidelink data transmission in the scheduled resource.
The scheduling information from the base station for the mode 1 sidelink communication may be obtained at the transmitting terminal by receiving DCI, and such DCI may include at least one of the following parameters:
In various embodiments, if the transmitting terminal receives the HARQ-ACK feedback information for the sidelink data transmission from the receiving terminal in the sidelink, or receives sidelink CSI feedback information which is sidelink channel information, the HARQ-ACK/CSI feedback timing information may indicate timing information for carrying the feedback information to the base station. To carry the feedback information to the base station, one or more of the following methods may be applied:
1. A method for indicating the timing for transmitting the HARQ-ACK feedback information and/or the sidelink CSI feedback information for the sidelink data transmission to the base station through the PUCCH or the PUSCH of the uplink in the bitfield of the HARQ-ACK/CSI feedback timing information of DCI. This method may indicate an offset (or a time difference) from a slot carrying the scheduling DCI to a slot transmitting the PUCCH or the PUSCH including the feedback information. In various embodiments, the slot carrying the DCI and the slot carrying the PUCCH or the PUSCH may include a sub-slot smaller than the slot in length, and the offset may include an index difference for the subslots. Alternatively, the base station may indicate an accurate offset value to the transmitting terminal, by transmitting a set of possible values among the offset values to the sidelink data transmitting terminal through the higher layer signaling, and indicating one value among the set carried through the higher layer signal through the DCI. In various embodiments, the set of the possible values among the offset values carried by the base station through the higher layer signaling may include different offset values according to the SCS (or numerology).
2. A method for the transmitting terminal to transmit the HARQ-ACK or the CSI feedback of the sidelink to the base station at a timing prearranged by the base station and the transmitting terminal.
In various embodiments, the SAI may enable the transmitting terminal to count the amount or the number of the sidelink scheduling received from the base station. The SAI may include at least one of a counter SAI and a total SAI. In various embodiments, in transmission of data for which the feedback needs to be transmitted to the base station at the same time in the sidelink data transmission, the base station may indicate the scheduling order of the data to the transmitting terminal, using the SAI included in each sidelink scheduling DCI. In various embodiments, the total SAI value may be applied or may not be used. That is, the SAI may indicate which bit of the total HARQ-ACK feedbacks to be transmitted on the PUCCH or PUSCH at the same time the HARQ-ACK bit for the data transmission for the sidelink indicated by the currently scheduled DCI should be mapped to. Alternatively, the SAI may indicate how many bits of the HARQ-ACK feedback should be transmitted on the PUCCH or PUSCH of a specific timing. For example, if the base station transmits the scheduling of the sidelink data transmission transmitting the sidelink HARQ-ACK feedback using the PUCCH or PUSCH of slot 2n to each transmitting terminal in slot n+1, slot n+2, slot n+3, and slot n+4, the SAI values included in the scheduling DCI may indicate 0, 1, 2, and 3 respectively. Thus, even if the terminal does not receive the DCI in the slot n+2 and the slot n+3, it may transmit 4-bit HARQ-ACK to the base station in the slot 2n based on this SAI, and the base station may successfully receive the 4-bits HARQ-ACK feedback information. If the SAI is absent, the terminal, which does not receive two DCIs, transmits only 2-bit HARQ-ACK feedback, but the base station, which receives the HARQ-ACK feedback by assuming that the HARQ-ACK feedback is 4 bits, may not correctly decode the HARQ-ACK feedback.
In various embodiments, there may be a specific time required for the signal processing until the transmitting terminal receives the DCI including the HARQ-ACK/CSI feedback timing information from the base station, and transmits the PUCCH or the PUSCH including the HARQ-ACK or the CSI feedback information from the DCI reception. A minimum time required for the signal processing may be calculated by considering one or more of the following times:
The base station is required to transmit the HARQ-ACK/CSI feedback timing information including a value greater than or equal to the calculated minimum time to the transmitting terminal, by considering the minimum time required for the signal processing of the transmitting terminal. If the HARQ-ACK/CSI feedback timing information includes a value smaller than the minimum time required for the signal processing of the transmitting terminal, the transmitting terminal may not transmit valid HARQ-ACK/CSI feedback information to the base station.
In various embodiments, the scheduling from the base station may include at least one of scheduling for single sidelink transmission, persistent transmission or SPS scheduling, or configured grant sidelink scheduling. The scheduling method may be distinguished by the indicator included in the DCI, the RNTI scrambled in the CRC added to the DCI or the ID value. A bit (e.g., 0 bit) may be added to the DCI, so that the size of the DCI is the same as the size of other DCI format such as DCI for downlink scheduling or uplink scheduling.
The transmitting terminal may receive the DCI for the sidelink scheduling from the base station, transmit the PSCCH including the sidelink scheduling information to the receiving terminal, and transmit the PSSCH which is data scheduled by the PSCCH to the receiving terminal. The sidelink scheduling information may be SCI, and the SCI may include at least one of the following parameters:
In various embodiments, the above-described control parameters may be transmitted to the receiving terminal through one SCI, or may be transmitted through two or more SCIs. Transmitting the control parameters through two SCIs may be referred to as a two-stage SCI transmission method.
According to the sixth embodiment, descriptions are made on a method for determining a frequency resource carrying HARQ-ACK feedback of a sidelink to the base station according to scheduling of the base station.
In various embodiments, in sidelink communication, the transmitting terminal may transmit data for unicast or groupcast to the receiving terminal, and the receiving terminal may transmit HARQ-ACK information for the received unicast or groupcast data to the transmitting terminal. The transmitting terminal determines a resource for transmitting the data without scheduling of the base station in the mode 2 sidelink communication, but the transmitting terminal receives scheduling information for scheduling the resource for the sidelink transmission from the base station in the mode 1 sidelink communication and perform the sidelink data transmission in the scheduled resource.
The scheduling information from the base station for the sidelink communication through the Mode 1 may be obtained by receiving DCI, and the DCI may include the following information.
In various embodiments, if the transmitting terminal receives the HARQ-ACK feedback information for the sidelink data transmission from the receiving terminal in the sidelink, or receives sidelink CSI feedback information which is sidelink channel information, the PUCCH resource indicator may indicate information of the frequency resource for transmitting the received feedback information to the base station through the PUCCH. The PUCCH resource indicator may indicate one PUCCH of one or more PUCCH resources configured through the higher layer signaling (the configured PUCCH resource may include a PUCCH resource for carrying the sidelink HARQ-ACK feedback information to the base station).
If it is indicated to transmit a plurality of PUCCHs at the same timing or in one slot, the base station and/or the transmitting terminal may select (determine) the PUCCH resource for transmitting the actual feedback information based on the following priority. In various embodiments, even if a specific PUCCH resource is determined, the feedback information transmitted in the corresponding PUCCH resource may include a bundle of feedback information indicated to be transmitted in various PUCCH resources.
For example, if the DCI indicates to transmit HARQ-ACK feedback for a first PSSCH related to sidelink transmission scheduled in the slot n through a first PUCCH resource in the slot 2n, and the DCI indicates to transmit HARQ-ACK feedback for a second PSSCH related to sidelink transmission scheduled in the slot n+1 through a second PUCCH resource in the slot 2n, the transmitting terminal may multiplex the HARQ-ACK feedback for the first PSSCH and the HARQ-ACK feedback for the second PSSCH using the second PUCCH resource in the slot 2n, and transmit the multiplexed HARQ-ACK feedback information. In various embodiments, multiplexing a plurality of information elements may mean concatenating the plurality of the information elements, and channel-coding and transmitting the concatenated information elements.
As another example, if the DCI indicates to transmit HARQ-ACK feedback for a first PDSCH related to downlink transmission scheduled in the slot n through a first PUCCH resource in the slot 2n, and the DCI indicates to transmit the HARQ-ACK feedback for the first PSSCH related to sidelink transmission scheduled in the slot n+1 through the second PUCCH resource in the slot 2n, the transmitting terminal may multiplex the HARQ-ACK feedback for the first PDSCH and the HARQ-ACK feedback for the first PSSCH using the second PUCCH resource in the slot 2n, and transmit the multiplexed HARQ-ACK feedback information. In other words, the transmitting terminal may transmit the HARQ-ACK feedback in the second PUCCH resource configured to transmit the sidelink feedback to the base station.
As another example, if the DCI indicates to transmit the HARQ-ACK feedback for the first PDSCH related to the downlink transmission scheduled in the slot n through the first PUCCH resource in the slot 2n, and the DCI indicates to transmit the HARQ-ACK feedback for the first PSSCH related to the sidelink transmission scheduled in the slot n through the second PUCCH resource in the slot 2n, the DCI schedules to transmit the HARQ-ACK feedback for the first PDSCH and the HARQ-ACK feedback for the first PSSCH at the same time but the transmitting terminal may multiplex the HARQ-ACK feedback for the first PDSC and the HARQ-ACK feedback for the first PSSCH using the first PUCCH resource in the slot 2n, and transmit the multiplexed HARQ-ACK feedback information, because the Uu link scheduling DCI precedes the SL link scheduling DCI. In other words, the transmitting terminal may transmit the HARQ-ACK feedback in the first PUCCH resource configured to transmit the feedback for the downlink data transmission to the base station.
Referring to
In step 2103, the terminal may identify a resource region for transmitting the SFCI to the base station. For example, the terminal may identify a PUCCH resource or a PUSCH resource for transmitting the SFCI to the base station, and a slot timing for transmitting the SFCI, based on control information received from the base station.
In step 2105, the terminal may transmit the control information including the SFCI and UCI to the base station in the resource region. In other words, the terminal may transmit the SFCI and the UCI together to the base station in the identified resource region.
In various embodiments, the SFCI may include at least one of an SL-SR for requesting resource scheduling for transmission or retransmission of the sidelink, HARQ-ACK for the sidelink data, SL-CSI which is channel state information for the sidelink channel, or a SL-BSR indicating a data amount to be transmitted by the other terminal.
In various embodiments, the UCI may include at least one of a SR for requesting resource scheduling for transmission or retransmission of the terminal, HARQ-ACK for downlink data, or channel state information of a radio access channel.
In various embodiments, bits of the HARQ-ACK for the downlink data and bits of the SL-SR may be consecutive in the control information. In other words, the bits of the HARQ-ACK for the downlink data and the bits of the SL-SR may configure consecutive bits. In this case, the bits of the SL-SR may be positioned before or after the bits of the HARQ-ACK for the downlink data.
In various embodiments, the bits of the HARQ-ACK for the downlink data and the bits of the SL-BSR may be consecutive in the control information. In other words, the bits of the HARQ-ACK for the downlink data and the bits of the SL-BSR may configure consecutive bits. In this case, the bits of the SL-BSR may be positioned before or after the bits of the HARQ-ACK for the downlink data.
In various embodiments, the HARQ-ACK bits for the downlink data and the HARQ-ACK bits for the sidelink data may be consecutive in the control information. In other words, the HARQ-ACK bits for the downlink data and the HARQ-ACK bits for the sidelink data may configure consecutive bits. In this case, the HARQ-ACK bits for the sidelink data may be positioned before or after the HARQ-ACK bits for the downlink data.
In various embodiments, the SFCI may be transmitted from the other terminal to the terminal through the PSFCH.
In various embodiments, a transmit power of the PSFCH may be determined based on a signal strength received by the other terminal. The signal may include at least one of PSCCH, DMRS for PSCCH, PSSCH, DMRS for PSSCH, a reference signal for positioning or a signal for positioning, a signal for obtaining synchronization in the sidelink, and a signal carried from a GPS or a GNSS.
In various embodiments, the resource region may be included in the PUCCH resource region or the PUSCH resource region.
In various embodiments, at least one of symbols transmitting the SFCI in the resource region and at least one of symbols transmitting the UCI in the resource region are the same, and a frequency resource transmitting the SFCI in the resource region and a frequency resource transmitting the UCI in the resource region may be different from each other. In other words, the SFCI may be frequency multiplexed in the PUSCH resource or the PUCCH resource.
In various embodiments, at least part of the frequency resource transmitting the SFCI in the resource region, and the frequency resource transmitting the UCI in the resource region are overlapped, the symbols transmitting the SFCI in the resource region and the symbols transmitting the UCI in the resource region may be different from each other. In other words, the SFCI may be time multiplexed in the PUSCH resource or the PUCCH resource.
In various embodiments, the terminal may receive first information indicating the PUCCH resource or the PUSCH resource for transmitting the SFCI to the base station, and a slot timing, determine a resource region corresponding to the PUSCH resource or the PUCCH resource in the slot indicated by the slot timing, based on the first information, and transmit control information including the SFCI and the UCI to the base station through the PUCCH resource or the PUSCH resource in the slot. The first information may be DCI.
In various embodiments, the terminal may receive second information indicating the PUCCH resource or the PUSCH resource for transmitting the UCI to the base station, and a slot timing, determine a resource region corresponding to the PUSCH resource or the PUCCH resource in the slot indicated by the slot timing, based on the second information, and transmit control information including the SFCI and the UCI to the base station through the PUCCH resource or the PUSCH resource in the slot. The second information may be DCI.
In various embodiments, the first information and the second information may be the same or different.
In various embodiments, the resource region may include the slot, and the terminal may identify a first slot timing for transmitting the SFCI, identify a second slot timing for transmitting the UCI, and transmit the SFCI and the UCI in the slot, in response to identifying that the first slot timing and the second slot timing indicate the slot.
In various embodiments, the timing for transmitting the SFCI to the base station may be determined based on a processing time required to transmit the SFCI to the base station after the terminal receives the SFCI from other terminal.
Referring to
In step 2203, the terminal may obtain measurement information related to a signal strength received from the other terminal. For example, the terminal may measure the signal strength received from the other terminal, and obtain the measurement information based on the measured signal strength.
In step 2205, the terminal may determine whether to transmit feedback information for sidelink groupcast data received from the other terminal, based on the location information and the measurement information. For example, the terminal may determine whether the sidelink groupcast data is valid data for the terminal based on the measurement information and the location information, and if it is the valid data, the terminal may determine to transmit the feedback information. By contrast, if it is not the valid data, the terminal may determine not to transmit the feedback information.
In various embodiments, the location information may include at least one of position information of the other terminal, an ID of an area in which the other terminal is located, information of a position at which the terminal is required to transmit the feedback information for the sidelink groupcast data, or an ID of an area in which the terminal is required to transmit the feedback information for the sidelink groupcast data.
In various embodiments, the measurement information may include at least one of the signal strength received from the other terminal, channel state information of a channel between the other terminal and the terminal, distance information between the other terminal and the terminal, or location information of the terminal.
In various embodiments, the terminal may identify the ID of the area where the other terminal is located, determine the ID of the area where the terminal is located, based on the location information of the terminal, determine to transmit the feedback information for the sidelink groupcast data received from the other terminal, based on determining that the ID of the area where the other terminal is located and the ID of the area where the terminal is located match, and transmit the feedback information to the other terminal.
In various embodiments, the terminal may identify a coordinate value of the area where the other terminal is located, identify a coordinate value of the area where the terminal is located, based on the location information of the terminal, determine to transmit the feedback information for the sidelink groupcast data received from the other terminal, based on determining that a difference of the coordinate value of the area where the other terminal is located and the coordinate value of the area where the terminal is located is less than a threshold, and transmit the feedback information to the other terminal. The threshold may be set in the terminal by the higher layer signaling from the base station or the other terminal.
In various embodiments, the terminal may identify the ID of the area where the other terminal is located, determine the ID of the area where the terminal is located, based on the location information of the terminal, and transmit the feedback information to the other terminal through a first PSFCH, if the ID of the area where the other terminal is located and the ID of the area where the terminal is located match. If the ID of the area where the other terminal is located and the ID of the area where the terminal is located do not match, the terminal may transmit the feedback information to the other terminal through a second PSFCH. The first PSFCH and the second PSFCH may be different from each other.
In various embodiments, the signal received from the other terminal may include at least one of PSCCH, DMRS for PSCCH, PSSCH, DMRS for PSSCH, a reference signal for positioning or a signal for positioning, a signal for obtaining synchronization in the sidelink, and a signal carried from a GPS or a GNSS.
In various embodiments, the feedback information may include at least one of an SL-SR for requesting resource scheduling for transmission or retransmission in the sidelink, HARQ-ACK for the sidelink groupcast data, SL-CSI which is channel state information for the sidelink channel, or a SL-BSR indicating a data amount to be transmitted by the terminal.
The methods according to the embodiments described in the claims or the specification of the disclosure may be implemented in software, hardware, or a combination of hardware and software.
As for the software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured for execution by one or more processors of an electronic device. One or more programs may include instructions for controlling the electronic device to execute the methods according to the embodiments described in the claims or the specification of the disclosure.
Such a program (software module, software) may be stored to a random access memory, a non-volatile memory including a flash memory, a read only memory (ROM), an electrically erasable programmable ROM (EEPROM), a magnetic disc storage device, a compact disc (CD)-ROM, digital versatile discs (DVDs) or other optical storage devices, and a magnetic cassette. Alternatively, it may be stored to a memory combining part or all of those recording media. In addition, a plurality of memories may be included.
Also, the program may be stored in an attachable storage device accessible via a communication network such as Internet, Intranet, local area network (LAN), wide LAN (WLAN), or storage area network (SAN), or a communication network by combining these networks. Such a storage device may access a device which executes an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may access the device which executes an embodiment of the present disclosure.
In the specific embodiments of the present disclosure, the elements included in the disclosure are expressed in a singular or plural form. However, the singular or plural expression is appropriately selected according to a proposed situation for the convenience of explanation, the disclosure is not limited to a single element or a plurality of elements, the elements expressed in the plural form may be configured as a single element, and the elements expressed in the singular form may be configured as a plurality of elements.
Meanwhile, while the specific embodiment has been described in the explanations of the present disclosure, it will be noted that various changes may be made therein without departing from the scope of the disclosure. Thus, the scope of the disclosure is not limited and defined by the described embodiment and is defined not only the scope of the claims as below but also their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2019-0027158 | Mar 2019 | KR | national |
| 10-2019-0081592 | Jul 2019 | KR | national |
This application is a continuation of U.S. application Ser. No. 17/437,363, which is a 371 National Stage of International Application No. PCT/KR2020/003193, filed Mar. 6, 2020, which claims priority to Korean Patent Application No. 10-2019-0027158, filed Mar. 8, 2019, and Korean Patent Application No. 10-2019-0081592, filed Jul. 5, 2019, the disclosures of which are herein incorporated by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17437363 | Sep 2021 | US |
| Child | 18766187 | US |
