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EP-4395435-B1 - WIRELESS COMMUNICATION METHOD AND TERMINAL DEVICE

EP4395435B1EP 4395435 B1EP4395435 B1EP 4395435B1EP-4395435-B1

Inventors

  • ZHAO, ZHENSHAN
  • Zhang, Shichang
  • MA, Teng

Dates

Publication Date
20260506
Application Date
20211022

Claims (13)

  1. A method for wireless communication in a NR system, comprising: determining (S210), by a terminal device, M physical sidelink feedback channel, PSFCH, transmission occasions of a PSFCH carrying feedback information corresponding to a first physical sidelink shared channel, PSSCH, wherein different PSFCH transmission occasions in the M PSFCH transmission occasions correspond to different time-domain resources, respectively; and for an m-th PSFCH transmission occasion in the M PSFCH transmission occasions, determining (S220), by the terminal device according to a result of a channel access procedure, whether to transmit the PSFCH carrying feedback information corresponding to the first PSSCH by using the m-th PSFCH transmission occasion, wherein M and m are positive integers, M ≥ 2, and 1 ≤ m ≤ M, wherein at most one PSFCH carrying the feedback information corresponding to the first PSSCH is transmitted by the terminal device in the M PSFCH transmission occasions, wherein determining, by the terminal device, the M PSFCH transmission occasions corresponding to the first PSSCH comprises: determining, by the terminal device, the M PSFCH transmission occasions corresponding to the first PSSCH in a plurality of PSFCH transmission slots configured by resource pool configuration information, wherein the method further comprises: determining, by the terminal device, a PSFCH transmission resource in a PSFCH transmission resource set which is comprised in the slot where the m-th PSFCH transmission occasion in the M PSFCH transmission occasions is located, wherein each PSFCH transmission slot in the plurality of PSFCH transmission slots comprises M PSFCH resource subsets, and each of the M PSFCH resource subsets comprises resources at granularity of interlaced resource block, IRB; and determining, by the terminal device, the PSFCH transmission resource in the PSFCH transmission resource set which is comprised in the slot where the m-th PSFCH transmission occasion is located comprises: determining, by the terminal device, that the PSFCH transmission resource of the m-th PSFCH transmission occasion corresponding to the first PSSCH is located in an m-th PSFCH resource subset in the slot where the m-th PSFCH transmission occasion is located.
  2. The method of claim 1, wherein determining, by the terminal device according to the result of the channel access procedure, whether to transmit the PSFCH carrying the feedback information corresponding to the first PSSCH by using the m-th PSFCH transmission occasion comprises: determining, by the terminal device, to transmit the PSFCH carrying the feedback information corresponding to the first PSSCH by using the m-th PSFCH transmission occasion in case that the result of the channel access procedure indicates a channel being idle; otherwise determining, by the terminal device, not to transmit the PSFCH carrying the feedback information corresponding to the first PSSCH by using the m-th PSFCH transmission occasion; or discarding, by the terminal device, sidelink transmission corresponding to the m-th PSFCH transmission occasion.
  3. The method of claim 1, wherein determining, by the terminal device, the M PSFCH transmission occasions corresponding to the first PSSCH in the plurality of PSFCH transmission slots configured by the resource pool configuration information comprises: determining, by the terminal device, a slot where a first PSFCH transmission occasion in the M PSFCH transmission occasions is located according to a slot where the first PSSCH is located and a minimum time gap between the first PSSCH and a PSFCH associated with the first PSSCH; and determining, by the terminal device, slot(s) where remaining M-1 PSFCH transmission occasions in the M PSFCH transmission occasions are located according to the slot where the first PSFCH transmission occasion is located and a PSFCH period.
  4. The method of claim 3, wherein determining, by the terminal device, the slot(s) where the remaining M-1 PSFCH transmission occasions in the M PSFCH transmission occasions are located according to the slot where the first PSFCH transmission occasion is located and the PSFCH period comprises: determining, by the terminal device, a slot where an A-th PSFCH transmission occasion in the M PSFCH transmission occasions is located according to the following formula: n ′ + K 1 × A − 1 × P ; where n' represents the slot where the first PSFCH transmission occasion is located, A is a positive integer and 2 ≤ A ≤ M, K1 is a positive integer, K1 is determined by pre-definition, pre-configuration or configuration information from a network device, and P represents the PSFCH period.
  5. The method of claim 1, further comprising: determining, by the terminal device, the PSFCH transmission resource in the m-th PSFCH resource subset in the slot where the m-th PSFCH transmission occasion is located according to at least one of: a sub-channel index corresponding to a frequency-domain starting position of the first PSSCH; a number of sub-channels corresponding to a frequency-domain resource size occupied by the first PSSCH; slot information of the first PSSCH; identity, ID, information of a transmitting device for the first PSSCH; or ID information of the terminal device.
  6. A terminal device (300), configured to operate in a NR system, comprising a first processing unit (310) and a second processing unit (320), wherein the first processing unit (310) is configured to determine M physical sidelink feedback channel, PSFCH, transmission occasions of a PSFCH carrying feedback information corresponding to a first physical sidelink shared channel, PSSCH, wherein different PSFCH transmission occasions in the M PSFCH transmission occasions correspond to different time-domain resources, respectively; and for an m-th PSFCH transmission occasion in the M PSFCH transmission occasions, the second processing unit (320) is configured to determine, according to a result of a channel access procedure, whether to transmit the PSFCH carrying feedback information corresponding to the first PSSCH by using the m-th PSFCH transmission occasion, wherein M and m are positive integers, M ≥ 2, and 1 ≤ m ≤ M, wherein at most one PSFCH carrying the feedback information corresponding to the first PSSCH is transmitted by the terminal device in the M PSFCH transmission occasions, wherein the first processing unit (310) is specifically configured to: determine the M PSFCH transmission occasions corresponding to the first PSSCH in a plurality of PSFCH transmission slots configured by resource pool configuration information, wherein the first processing unit (310) is further configured to determine a PSFCH transmission resource in a PSFCH transmission resource set which is comprised in the slot where the m-th PSFCH transmission occasion in the M PSFCH transmission occasions is located, wherein each PSFCH transmission slot in the plurality of PSFCH transmission slots comprises M PSFCH resource subsets, each of the M PSFCH resource subsets comprises resources at granularity of interlaced resource block, IRB; and the first processing unit (310) is specifically configured to: determine that the PSFCH transmission resource of the m-th PSFCH transmission occasion corresponding to the first PSSCH is located in an m-th PSFCH resource subset in the slot where the m-th PSFCH transmission occasion is located.
  7. The terminal device of claim 6, wherein the second processing unit (320) is specifically configured to: determine to transmit the PSFCH carrying the feedback information corresponding to the first PSSCH by using the m-th PSFCH transmission occasion in case that the result of the channel access procedure indicates a channel being idle; otherwise determine to not transmit the PSFCH carrying the feedback information corresponding to the first PSSCH by using the m-th PSFCH transmission occasion; or discard sidelink transmission corresponding to the m-th PSFCH transmission occasion.
  8. The terminal device of claim 6, wherein the first processing unit (310) is specifically configured to: determine a slot where a first PSFCH transmission occasion in the M PSFCH transmission occasions is located according to a slot where the first PSSCH is located and a minimum time gap between the first PSSCH and a PSFCH associated with the first PSSCH; and determine slot(s) where remaining M-1 PSFCH transmission occasions in the M PSFCH transmission occasions are located according to the slot where the first PSFCH transmission occasion is located and a PSFCH period.
  9. The terminal device of claim 8, wherein the first processing unit (310) is specifically configured to: determine a slot where an A-th PSFCH transmission occasion in the M PSFCH transmission occasions is located according to the following formula: n ′ + K 1 × A − 1 × P ; where n'represents the slot where the first PSFCH transmission occasion is located, A is a positive integer and 2 ≤ A ≤ M, K1 is a positive integer, K1 is determined by pre-definition, pre-configuration or configuration information from a network device, and P represents the PSFCH period.
  10. The terminal device of claim 6, wherein the first processing unit (310) is further configured to determine the PSFCH transmission resource in the m-th PSFCH resource subset in the slot where the m-th PSFCH transmission occasion is located according to at least one of: a sub-channel index corresponding to a frequency-domain starting position of the first PSSCH; a number of sub-channels corresponding to a frequency-domain resource size occupied by the first PSSCH; slot information of the first PSSCH; identity (ID) information of a transmitting device for the first PSSCH; or ID information of the terminal device.
  11. A chip, comprising a processor configured to call a computer program stored in a memory to and run the computer program, to cause a terminal device mounted with the chip to perform the method according to any one of claims 1 to 5.
  12. A computer-readable storage medium, configured to store a computer program which, when being run on a computer, causes the computer to perform the method according to any one of claims 1 to 5.
  13. A computer program product, comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method according to any one of claims 1 to 5.

Description

TECHNICAL FIELD The disclosure relates to the field of communications, and particularly to a method for wireless communication and a terminal device. BACKGROUND In new radio (NR) sidelink (SL) transmission, physical sidelink shared channels (PSSCHs) correspond to transmission resources of physical sidelink feedback channel (PSFCH) one by one, i.e., for each PSSCH transmission, receiving end terminal(s) may determine a unique PSFCH transmission resource and perform sidelink feedback on the PSFCH transmission resource. When sidelink-based transmission (such as device to device (D2D) or vehicle to everything (V2X) transmission) works in unlicensed spectrum, the terminal device needs to meet transmission requirements of the unlicensed spectrum before performing the sidelink transmission. For example, the terminal device may determine, through listen before talk (LBT), whether a channel can be accessed. Specifically, the terminal device monitors whether the channel is idle, and when the channel is idle, the terminal device may perform the sidelink transmission, otherwise, the sidelink transmission may not be performed. When the receiving end terminal(s) needs to send a PSFCH to feed back an acknowledgement (ACK), the PSFCH may not be sent if the channel is determined to be busy through the LBT. In such situation, the transmitting end terminal(s) may not detect the PSFCH and may determine that it is a discontinuous transmission (DTX), and will retransmit the sidelink data, which may lead to a waste of resources. Related technologies can be found in patent documents WO 2021/081948 A1, EP 4325762 A1, EP 4325906A1, WO 2022/073186A1 and non-patent document R1-1911957. Patent document WO 2021/081948 A1 provides a HARQ feedback method including: a first terminal device performs LBT, and after the LBT succeeds, the first terminal device sends HARQ information of multiple second terminal devices on the channel resources after the LBT succeeds. Patent document EP 4325762 A1 provides a method for determining a sidelink feedback resource, including determining, by a first UE, a first resource, where the first resource is one or more resources used by the first UE to perform a channel access procedure. Patent document EP 4325906A1 provides a resource configuration method including obtaining, by a terminal device, first configuration information, the first configuration information being used for configuring sidelink communication resources; obtaining, by the terminal device, a structure of a resource allocation unit according to the first configuration information; and allocating, by the terminal device, one or more resource allocation units for sidelink communication of the terminal device. Patent document WO 2022/073186A1 provides a method for communicating using sidelink resources allocated in an unlicensed spectrum. The method generally includes receiving one or more transmissions from a second UE on one or more sidelink sub-channels spanning one or more resource block (RB) sets of an unlicensed spectrum occupied by the second UE for a channel occupancy time (COT) and transmitting, to the second UE, feedback information corresponding to the one or more received transmissions on a feedback channel based on a mapping between the one or more sidelink sub-channels and the feedback channel that confines the feedback channel to at least the one or more RB sets and one or more guard bands between the one or more RB sets of the unlicensed spectrum occupied by the second UE for the COT. The non-patent document R1-1911957 provides discussion on sidelink PSFCH design and related HARQ operation, sidelink CSIRS procedures, and sidelink power control. SUMMARY Embodiments of the present disclosure provide a method for wireless communication and a terminal device. One PSSCH corresponds to multiple PSFCH transmission occasions, thereby increasing transmission occasions of PSFCH carrying feedback information corresponding to the PSSCH, so that the terminal device can perform sidelink transmission by using the unlicensed spectrum, thereby optimizing NR SL transmission. The present invention is defined in the claims. According to the above technical solution, the terminal device determines the M PSFCH transmission occasions corresponding to the first PSSCH, and determines, according to the result of the channel access procedure, whether to transmit the PSFCH carrying feedback information corresponding to the first PSSCH by using a certain PSFCH transmission occasion. Therefore, transmission occasions of the PSFCH carrying the feedback information corresponding to the PSSCH can be increased, so that the terminal device can perform sidelink transmission by using the unlicensed spectrum, thereby optimizing NR SL transmission. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of architecture of a communication system applied in an embodiment of the disclosure.FIG. 2 is a schematic diagram of architecture of another communication s