KR-20260065954-A - Method and device for sidelink communication

Abstract

The present application provides a method and apparatus for sidelink communication, which is advantageous for two or more terminal devices in a sidelink communication system to perform start beam pairing based on a sidelink. The method comprises the step of determining a first transmission beam by a first terminal device among a plurality of transmission beams of a second terminal device—the first transmission beam is used for the first terminal device and the second terminal device to perform start beam pairing—; and the step of transmitting beam feedback to the second terminal device by the first terminal device on a first resource—the first resource is determined based on first information, the first information is used to indicate a mapping relationship between a plurality of resources including the first resource and the plurality of transmission beams, and the first information is additionally used by the second terminal device to determine the first transmission beam.

Inventors

• 뤼, 링
• 자오, 정

Assignees

• 켁텔 와이어리스 솔루션즈 코퍼레이션 리미티드

Dates

Publication Date

20260511

Application Date

20231007

Claims (20)

1. As a method for sidelink communication, A step of determining a first transmission beam by the first terminal device among a plurality of transmission beams of the second terminal device - said first transmission beam is used for the first terminal device and the second terminal device to perform start beam pairing -; and A step of transmitting beam feedback to a second terminal device by the first terminal device on a first resource - the first resource is determined based on first information, the first information is used to indicate a mapping relationship between a plurality of resources including the first resource and the plurality of transmission beams, and the first information is additionally used by the second terminal device to determine the first transmission beam - A method characterized by including
2. In paragraph 1, A method characterized in that the plurality of resources are dedicated resources for one or more terminal devices other than the second terminal device to transmit beam feedback to the second terminal device, and the one or more terminal devices include the first terminal device.
3. In paragraph 1 or 2, A method characterized in that the plurality of resources include a plurality of feedback occupations (FOs), and the mapping relationship includes that one of the plurality of transmission beams corresponds to one or more FOs.
4. In paragraph 3, A method characterized in that the number of the plurality of FOs is greater than the number of the plurality of transmission beams, the plurality of FOs are divided into a plurality of FO groups based on the number of the plurality of transmission beams, and each of the beams among the plurality of transmission beams corresponds to a plurality of FOs located at the same position within the plurality of FO groups.
5. In paragraph 4, A method characterized in that if the quantity of FOs in the last FO group of the plurality of FO groups is smaller than the quantity of the plurality of transmission beams, the FOs in the last FO group are not used for beam feedback transmission.
6. In paragraph 3, A method characterized in that the quantity of the plurality of FOs is determined based on the quantity of the plurality of transmission beams, and the first information is additionally used to indicate that the plurality of transmission beams and the plurality of FOs correspond one-to-one.
7. In any one of paragraphs 1 through 6, A method characterized in that the plurality of resources include M FOs, where M is a natural number greater than 1, the M FOs are used for N terminal devices other than the second terminal device to transmit beam feedback, where N is a natural number greater than 1 and less than M, and the quantity of FOs corresponding to each terminal device among the N terminal devices is determined additionally based on the service priority of the N terminal devices and/or the communication demand of the N terminal devices.
8. In Paragraph 7, A method characterized in that the quantity of FOs corresponding to at least two of the N terminal devices is different from each other, and the quantity of FOs corresponding to the terminal device with the highest service priority among the at least two terminal devices is the largest.
9. In paragraph 8, The quantity of FO corresponding to the i-th terminal device among the above N terminal devices is represented as k i , and and, if If so, the maximum value between k1 and kN according to the first descent gradient Processing is performed until this occurs, and the FO corresponding to the i-th terminal device is, Displayed as {FO si , k i }; FO si is the starting position of the FO corresponding to the i-th terminal device, and FO si = A method characterized by j∈[1,2,… i-1].
10. In paragraph 8, The quantity of FOs corresponding to each terminal device among the above N terminal devices is adjusted based on a configuration coefficient, said configuration coefficient is related to the service priority of the terminal devices, and the FO corresponding to the i-th terminal device among the above N terminal devices is, Represented as {FO si , α i ×H}; H represents the base of the FO corresponding to each terminal device among the above N terminal devices, α i is the configuration coefficient of the above i-th terminal device, and α i is an integer, and , F O si = A method characterized by j∈[1,2,…i-1].
11. In paragraph 8, A method characterized in that the quantity of FOs corresponding to each terminal device among the N terminal devices is determined by dividing the M FOs into N equal parts, and the remaining FOs after dividing the M FOs into N equal parts are used in one or more terminal devices among the N terminal devices that have a priority higher than a first threshold value.
12. In any one of paragraphs 1 through 11, A method characterized in that the plurality of resources include one or more dedicated slots for beam feedback transmission, and any one of the one or more dedicated slots includes resources occupied by K×X FOs, where K represents the quantity of FOs in the frequency domain and K is a natural number greater than or equal to 1, X represents the quantity of FOs in the time domain and X is a natural number greater than or equal to 1, and the index of the K×X FOs increases progressively according to the time domain and/or frequency domain.
13. In any one of paragraphs 1 through 12, A method characterized by further including the step of determining the first transmission beam by the first terminal device based on instructions from the network device.
14. In any one of paragraphs 1 through 13, The above beam feedback is, Sidelink Channel Status Information Reference Signal (CSI-RS); Physical Sidelink Feedback Channel (PSFCH); or Sidelink Control Information (SCI) A method characterized by being associated with one or more of the following.
15. In any one of paragraphs 1 through 14, A method characterized in that the start beam pairing is performed before the first terminal device and the second terminal device establish a unicast link, and the first information is determined based on PSFCH; or, the start beam pairing is performed after the first terminal device and the second terminal device establish a unicast link, and the first information is determined based on SCI.
16. In any one of paragraphs 1 through 15, A method characterized in that the plurality of transmission beams are used to carry a reference signal, and the reference signal includes one or more of S-SSB and sidelink CSI-RS.
17. As a method for sidelink communication, A step of transmitting a reference signal by a second terminal device using a plurality of transmission beams - the plurality of transmission beams are used by a first terminal device to determine a first transmission beam, and the first transmission beam is used by the first terminal device and the second terminal device to perform start beam pairing -; and A step of receiving beam feedback transmitted from the first terminal device on a first resource by the second terminal device - the first resource is determined based on first information, the first information is used to indicate a mapping relationship between a plurality of resources including the first resource and the plurality of transmission beams, and the first information is additionally used by the second terminal device to determine the first transmission beam - A method characterized by including
18. In Paragraph 17, A method characterized in that the plurality of resources are dedicated resources for one or more terminal devices other than the second terminal device to transmit beam feedback to the second terminal device, and the one or more terminal devices include the first terminal device.
19. In paragraph 17 or 18, A method characterized in that the plurality of resources include a plurality of feedback occupations (FOs), and the mapping relationship includes that one of the plurality of transmission beams corresponds to one or more FOs.
20. In Paragraph 19, A method characterized in that the number of the plurality of FOs is greater than the number of the plurality of transmission beams, the plurality of FOs are divided into a plurality of FO groups based on the number of the plurality of transmission beams, and each of the beams among the plurality of transmission beams corresponds to a plurality of FOs located at the same position within the plurality of FO groups.

Description

Method and device for sidelink communication This application relates to the field of communication technology, and more specifically, to a method and apparatus for sidelink communication. When communicating in relatively high frequency bands (e.g., millimeter wave bands), network devices can achieve system coverage through beam scanning based on large-scale antenna arrays. Beam scanning requires specific spatiotemporal resources and consumes relatively high power. Therefore, network devices and terminal devices determine the optimal transmit/receive beam pairs through beam pairing and use them for uplink/downlink transmission. In a sidelink communication system, when a terminal device performs start beam pairing based on the sidelink, determining the resource for beam feedback is a challenge that needs to be solved. Embodiments of the present application provide a method and apparatus for sidelink communication. Each aspect relating to the embodiments of the present application is described below. In a first embodiment, a method for sidelink communication is provided, comprising the step of determining a first transmission beam by a first terminal device among a plurality of transmission beams of a second terminal device—the first transmission beam is used for the first terminal device and the second terminal device to perform start beam pairing—; and the step of transmitting beam feedback to the second terminal device by the first terminal device on a first resource—the first resource is determined based on first information, the first information is used to indicate a mapping relationship between a plurality of resources including the first resource and the plurality of transmission beams, and the first information is additionally used by the second terminal device to determine the first transmission beam. In a second embodiment, a method for sidelink communication is provided, wherein a second terminal device transmits a reference signal using a plurality of transmit beams - the plurality of transmit beams are used by a first terminal device to determine a first transmit beam, and the first transmit beam is used by the first terminal device and the second terminal device to perform start beam pairing -; and by the second terminal device to receive beam feedback transmitted from the first terminal device on a first resource - the first resource is determined based on first information, the first information is used to indicate a mapping relationship between a plurality of resources including the first resource and the plurality of transmit beams, and the first information is additionally used by the second terminal device to determine the first transmit beam - In a third embodiment, a device for sidelink communication is provided, wherein the device is a first terminal device, the first terminal device is used to determine a first transmission beam among a plurality of transmission beams of a second terminal device, and the first transmission beam is a determination unit used for the first terminal device and the second terminal device to perform start beam pairing; and a transmission unit used to transmit beam feedback to the second terminal device on a first resource, wherein the first resource is determined based on first information, the first information is used to indicate a mapping relationship between a plurality of resources including the first resource and the plurality of transmission beams, and the first information is additionally used by the second terminal device to determine the first transmission beam. In a fourth embodiment, a device for sidelink communication is provided, wherein the device is a second terminal device, and the second terminal device is used to transmit a reference signal using a plurality of transmit beams, and the plurality of transmit beams comprises: a transmitting unit used by a first terminal device to determine a first transmit beam - the first transmit beam is used by the first terminal device and the second terminal device to perform start beam pairing -; and a receiving unit used to receive beam feedback transmitted from the first terminal device on a first resource - the first resource is determined based on first information, the first information is used to indicate a mapping relationship between a plurality of resources including the first resource and the plurality of transmit beams, and the first information is additionally used by the second terminal device to determine the first transmit beam -. In a fifth embodiment, a communication device is provided comprising a memory for storing a program and a processor for calling a program in said memory to perform a method according to a first embodiment or a second embodiment. In a sixth embodiment, an apparatus is provided that includes a processor for calling a program from memory to perform a method according to a first embodiment or a second embodiment. In a seventh embodiment, a chip is provided, said ch