Search

US-12628183-B2 - Method and apparatus for multiple sidelink transmission opportunities in one slot

US12628183B2US 12628183 B2US12628183 B2US 12628183B2US-12628183-B2

Abstract

Embodiments of the present disclosure relate to methods and apparatuses for sidelink transmissions on an unlicensed spectrum. According to some embodiments of the disclosure, a method may include: determining a set of candidate starting positions for sidelink transmission; and performing a first channel access procedure for a first candidate starting position of the set of candidate starting positions in a first slot.

Inventors

  • Haipeng Lei
  • Haiming Wang
  • Xiaodong Yu
  • Zhennian Sun

Assignees

  • LENOVO (BEIJING) LIMITED

Dates

Publication Date
20260512
Application Date
20200821

Claims (20)

  1. 1 . A method performed by a user equipment (UE), the method comprising: determining a plurality of candidate starting positions for sidelink transmission in a first slot, each candidate starting position of the plurality of candidate starting positions indicating a different symbol within the first slot; performing, prior to a first candidate starting position of the plurality of candidate starting positions, a first channel access procedure for the first candidate starting position; and in response to the first channel access procedure failing, transmitting a first physical sidelink control channel (PSCCH) or a first physical sidelink shared channel (PSSCH) from a second candidate starting position of the plurality of candidate starting positions in the first slot, wherein the second candidate starting position indicates a symbol that is later than a symbol indicated by the first candidate starting position within the first slot.
  2. 2 . A user equipment (UE) for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: determine a plurality of candidate starting positions for sidelink transmission in a first slot, each candidate starting position of the plurality of candidate starting positions indicating a different symbol within the first slot; perform, prior to a first candidate starting position of the plurality of candidate starting positions, a first channel access procedure for the first candidate starting position; and in response to the first channel access procedure failing, transmit a first physical sidelink control channel (PSCCH) or a first physical sidelink shared channel (PSSCH) from a second candidate starting position of the plurality of candidate starting positions in the first slot, wherein the second candidate starting position indicates a symbol that is later than a symbol indicated by the first candidate starting position within the first slot.
  3. 3 . The UE of claim 2 , wherein the at least one processor is further configured to cause the UE to: generate the first PSCCH and the first PSSCH, wherein the first PSSCH is scheduled by the first PSCCH for transmitting a transport block (TB).
  4. 4 . The UE of claim 3 , wherein the first PSSCH is divided into one or more symbol groups that are configured by radio resource control (RRC) signaling, predefined in standards, or determined based on the plurality of candidate starting positions.
  5. 5 . The UE of claim 4 , wherein each symbol group of the one or more symbol groups includes an integer number of code blocks (CBs) of the TB.
  6. 6 . The UE of claim 5 , wherein the at least one processor is further configured to cause the UE to: receive respective hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to each of the one or more symbol groups.
  7. 7 . The UE of claim 4 , wherein each symbol group of the one or more symbol groups includes an integer number of code block groups (CBGs) of the TB.
  8. 8 . The UE of claim 7 , wherein the at least one processor is further configured to cause the UE to: receive respective hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to each of the CBGs.
  9. 9 . The UE of claim 8 , wherein the at least one processor is further configured to cause the UE to: transmit a CBG in response to the respective HARQ-ACK feedback for the CBG being a negative acknowledgement (NACK).
  10. 10 . The UE of claim 4 , wherein each symbol group of the one or more symbol groups includes a redundancy version (RV) of the TB.
  11. 11 . The UE of claim 10 , wherein the at least one processor is further configured to cause the UE to: transmit a plurality of RVs of the TB on the one or more symbol groups.
  12. 12 . The UE of claim 2 , wherein the plurality of candidate starting positions is configured by radio resource control (RRC) signaling or is predefined.
  13. 13 . The UE of claim 2 , wherein the plurality of candidate starting positions is determined based on one or more symbol groups, and the one or more symbol groups is configured by radio resource control (RRC) signaling or is predefined.
  14. 14 . The UE of claim 13 , wherein a quantity of candidate starting positions in the plurality of candidate starting positions is equal to a quantity of symbol groups of the one or more symbol groups.
  15. 15 . The UE of claim 2 , wherein the first PSSCH is transmitted on available symbols in the first slot.
  16. 16 . The UE of claim 15 , wherein the first PSSCH is punctured when a quantity of symbols of the first PSSCH is greater than a quantity of the available symbols in the first slot.
  17. 17 . The UE of claim 16 , wherein a last one or more symbols of the first PSSCH are punctured.
  18. 18 . The UE of claim 2 , wherein the at least one processor is further configured to cause the UE to: transmit a second PSSCH in a second slot following the first slot in response to the first PSSCH being transmitted in the first slot.
  19. 19 . The UE of claim 18 , wherein the at least one processor is further configured to cause the UE to: receive symbol group-based hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback or code block groups (CBG) based HARQ-ACK feedback for the first PSSCH; and receive transport block (TB)-based HARQ-ACK feedback for the second PSSCH.
  20. 20 . A processor for wireless communication, comprising: at least one controller coupled with at least one memory and configured to cause the processor to: determine a plurality of candidate starting positions for sidelink transmission in a first slot, each candidate starting position of the plurality of candidate starting positions indicating a different symbol within the first slot; perform, prior to a first candidate starting position of the plurality of candidate starting positions, a first channel access procedure for the first candidate starting position; and in response to the first channel access procedure failing, transmit a first physical sidelink control channel (PSCCH) or a first physical sidelink shared channel (PSSCH) from a second candidate starting position of the plurality of candidate starting positions in the first slot, wherein the second candidate starting position indicates a symbol that is later than a symbol indicated by the first candidate starting position within the first slot.

Description

TECHNICAL FIELD Embodiments of the present disclosure generally relate to wireless communication technology, and more particularly to sidelink transmissions on an unlicensed spectrum. BACKGROUND In a wireless communication system, a user equipment (UE), e.g., mobile device, may communicate with another UE via a data path supported by an operator's network, e.g., a cellular or a Wi-Fi network infrastructure. The data path supported by the operator's network may include a base station (BS) and multiple gateways. In the case that the UEs are relatively close to each other, a radio link or a sidelink can be established between both UEs to provide Device-to-Device (D2D) communication and without going through a direct link to the BS. The term “sidelink” or “SL” may refer to a direct radio link established for communicating among devices, e.g., UEs, as opposed to communicating via the cellular infrastructure (uplink and downlink) as discussed above. In this case, the “sidelink” is also referred to as a D2D or sidelink communication link. The sidelink communication link may be used in any suitable telecommunication network in accordance with various standards, where the telecommunication network may configure a resource pool to be used by the UEs during such sidelink communication. D2D communication has evolved into vehicle-to-everything (V2X) communication in the Long Term Evolution (LTE) sidelink standard. The V2X communication technology encompasses communication involving vehicles as message sources or destinations. In a new radio (NR) communication system, a transmitting (Tx) UE may send a sidelink transmission to a specific receiving (Rx) UE in a unicast mode, to a group of Rx UEs in a groupcast mode, or to Rx UEs within a range in a broadcast mode. A UE may operate in both a licensed spectrum and an unlicensed spectrum. For a transmission on an unlicensed spectrum, in order to achieve fair coexistence between wireless systems, a channel access procedure (e.g., a listen-before-talk (LBT) procedure) may be required before transmission on the unlicensed spectrum. In the LBT procedure, a UE may perform energy detection on a certain channel. If the detected energy is lower than a predefined threshold, the channel is deemed as empty and available for transmission, and then the LBT procedure is successful. Only when the LBT procedure is successful can the UE start transmission on the channel and occupy the channel a certain channel occupancy time (COT), which is less than a maximum channel occupancy time (MCOT). Otherwise, the UE cannot start the transmission and may continue to perform another LBT procedure until a successful LBT procedure. Sidelink transmission may also be performed on an unlicensed spectrum. There is a need for handling sidelink transmissions on an unlicensed spectrum. For example, solutions that can improve the utilization of radio resources with relatively simple implementation so as to enhance the sidelink transmission on the unlicensed spectrum are desired. SUMMARY Some embodiments of the present disclosure provide a method. The method may include: determining a set of candidate starting positions for sidelink transmission; and performing a first channel access procedure for a first candidate starting position of the set of candidate starting positions in a first slot. Some embodiments of the present disclosure provide an apparatus. According to some embodiments of the present disclosure, the apparatus may include: at least one non-transitory computer-readable medium having stored thereon computer-executable instructions; at least one receiving circuitry; at least one transmitting circuitry; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry and the at least one transmitting circuitry, wherein the at least one non-transitory computer-readable medium and the computer executable instructions may be configured to, with the at least one processor, to cause the apparatus to perform a method according to some embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS In order to describe the manner in which the advantages and features of the disclosure can be obtained, a description of the disclosure is rendered by reference to specific embodiments thereof, which are illustrated in the appended drawings. These drawings depict only exemplary embodiments of the disclosure and are not therefore to be considered limiting of its scope. FIG. 1 illustrates a schematic diagram of a wireless communication system in accordance with some embodiments of the present disclosure; FIG. 2 illustrates an exemplary symbol group configuration in accordance with some embodiments of the present disclosure; FIG. 3 illustrates an exemplary symbol group configuration in accordance with some embodiments of the present disclosure; FIG. 4 illustrates an exemplary symbol group configuration in accordance with some embodiments of t