Two-stage discovery in sidelink

Abstract

To enable more efficient sidelink communications, methods, apparatus, and computer program products are provided. An example method of operation by a first wireless device includes transmitting a sidelink discovery probe message including at least a first identifier of the first sidelink device. The example method also includes monitoring for a probe response from a second sidelink device. The example method also includes transmitting a sidelink discovery message if the first sidelink device receives the probe response from the second sidelink device. The example method also includes skipping transmitting the sidelink discovery message if the first sidelink device does not receive the probe response from the second sidelink device.

Claims

1. A method for wireless communication at a first-side link device, comprising: In response to the occurrence of an aperiodic triggering of a sidelink discovery probe message, the sidelink discovery probe message is transmitted via a plurality of beams including a first beam, the aperiodic triggering being based on a beam refinement process, and the sidelink discovery probe message including at least a first identifier of the first sidelink device. Monitor probe responses from second-side link devices; The detection response is received on the first beam, the detection response including beam information of at least one of the plurality of beams; The beam information is determined based on a mapping between a first resource for the sidelink discovery probe message and a second resource for the probe response, the mapping being used to determine at least one beam that the first sidelink device will use to send the sidelink discovery message; as well as The sidelink discovery message is transmitted on at least one beam indicated in the beam information.

2. The method according to claim 1, further comprising: A second beam is determined to be associated with the second resource used for the probe response, wherein the first sidelink device sends the sidelink discovery message to the second sidelink device on the second beam associated with the second resource used for the probe response.

3. The method according to claim 1, wherein, The at least one beam includes the first beam, and the detection response includes a first identifier of the first sidelink device, a second identifier of the second sidelink device, and information about the at least one beam.

4. The method according to claim 3, wherein, The first sidelink device receives the probe response on the first beam, and the probe response includes information from multiple beams.

5. The method according to claim 1, wherein, Sending the sidelink discovery probe message also includes: The sidelink discovery probe message is sent sequentially.

6. The method according to claim 5, wherein, The sequence is one of the m-sequence, the Gold sequence, or the Zadoff-Chu sequence.

7. The method according to claim 1, wherein, Sending the sidelink discovery probe message also includes: The sidelink discovery probe message is sent in the sidelink control information (SCI).

8. The method according to claim 1, wherein, Sending the sidelink discovery probe message also includes: The sidelink discovery probe message is unicast.

9. The method according to claim 1, wherein, Sending the sidelink discovery probe message also includes: Broadcast or multicast the sidelink discovery probe message.

10. The method according to claim 1, wherein, The first sidelink device corresponds to the advertised user equipment (UE), and the sidelink discovery message includes an existence announcement message.

11. The method according to claim 10, wherein, Sending the sidelink discovery probe message includes sending the sidelink discovery probe message on the plurality of beams, and the method further includes: The probe response is received from the second sidelink device on the second beam of the plurality of beams, wherein the first sidelink device sends the presence declaration message to the second sidelink device on the second beam; and Monitor connection requests from the second side link device on the second beam.

12. The method according to claim 10, wherein, Sending the sidelink discovery probe message also includes: The sidelink discovery probe message is sent periodically.

13. The method of claim 10, further comprising: Perform a Radio Resource Management (RRM) procedure, which includes the transmission of the sidelink discovery probe message.

14. The method according to claim 1, wherein, The first sidelink device corresponds to the discoverer user equipment (UE), and the sidelink discovery message includes a solicitation message.

15. The method according to claim 14, wherein, Sending the sidelink discovery probe message includes sending the sidelink discovery probe message on the plurality of beams, and the method further includes: The probe response is received from the second sidelink device on the first beam of the plurality of beams, wherein the first sidelink device sends the solicitation message to the second sidelink device on the first beam; and On the first beam, monitor response messages from the second side link device in response to a request message to the second side link device.

16. The method according to claim 1, further comprising: Receiving the probe response from the second sidelink device, the probe response indicating the duration during which the second sidelink device is available, wherein sending the sidelink discovery message includes sending the sidelink discovery message to the second sidelink device during the duration.

17. A method for performing wireless sidelink communication with a first sidelink device at a second sidelink device, comprising: A sidelink discovery probe message is received from the first sidelink device based on the occurrence of non-periodic triggering. The sidelink discovery probe message identifies the first sidelink device and also includes a beam indication corresponding to at least one of a plurality of beams. The non-periodic triggering is based on a beam refinement process. In response to the sidelink discovery probe message, a probe response is sent to the first sidelink device; as well as Monitor sidelink discovery messages sent from the first sidelink device on at least one beam determined based on a mapping between a first resource for the sidelink discovery probe message and a second resource for the probe response.

18. The method according to claim 17, wherein, Sending the probe response includes using a second resource associated with the second beam to send the probe response, and the method further includes: The second beam is used to monitor the sidelink discovery messages from the first sidelink device based on the mapping.

19. The method of claim 17, wherein, The detection response includes a first identifier of the first sidelink device, a second identifier of the second sidelink device, and the beam indication of the at least one beam.

20. The method according to claim 19, wherein, Sending the probe response includes sending the probe response on a single beam, the probe response including information from the plurality of beams.

21. The method of claim 17, further comprising: In the detection response, information about the duration during which the second sidelink device can be used for detection is sent.

22. The method according to claim 17, wherein, The sidelink discovery message includes an existence declaration message from the sidelink device that declares its presence, and the method further includes: Receive the presence declaration message from the declared side link device; and Send a connection request to the declared side link device.

23. The method according to claim 17, wherein, The sidelink discovery message includes a solicitation message from the discoverer's sidelink device, and the method further includes: Receive the solicitation message from the discoverer sidelink device; and Send a response to the solicitation message.

24. An apparatus for performing wireless communication at a first-side link device, comprising: A component for transmitting the sidelink discovery probe message via a plurality of beams including a first beam in response to an aperiodic triggering of the sidelink discovery probe message, the aperiodic triggering being based on a beam refinement process, the sidelink discovery probe message including at least a first identifier of the first sidelink device. Components used to monitor probe responses from second-side link devices; A component for receiving the detection response on a first beam of the plurality of beams, the detection response including beam information of at least one of the plurality of beams; Components for determining beam information based on a mapping between a first resource for the sidelink discovery probe message and a second resource for the probe response, the mapping being used to determine at least one beam that the first sidelink device will use to send the sidelink discovery message; as well as A component for transmitting the sidelink discovery message on at least one beam indicated in the beam information.

25. The apparatus of claim 24, further comprising: Components for performing the method as described in any one of claims 2-16.

26. An apparatus for wirelessly communicating with a first side link device at a second side link device, comprising: Components for receiving a sidelink discovery probe message from the first sidelink device based on an aperiodic triggering event, the sidelink discovery probe message identifying the first sidelink device, the sidelink discovery probe message further including a beam indication corresponding to at least one of a plurality of beams, the aperiodic triggering being based on a beam refinement process; A component for sending a probe response to the first sidelink device in response to the sidelink discovery probe message; as well as A component for monitoring sidelink discovery messages transmitted from the first sidelink device on at least one beam, determined based on a mapping between a first resource for the sidelink discovery probe message and a second resource for the probe response.

27. The apparatus of claim 26, further comprising: Components for performing the method as described in any one of claims 18-23.

28. An apparatus for performing wireless sidelink communication at a first sidelink device, comprising: One or more memory units; as well as One or more processors coupled to the one or more memories, the one or more processors being configured to enable the first side link device: In response to the occurrence of an aperiodic triggering of a sidelink discovery probe message, the sidelink discovery probe message is transmitted via a plurality of beams including a first beam, the aperiodic triggering being based on a beam refinement process, and the sidelink discovery probe message including at least a first identifier of the first sidelink device. Monitor probe responses from second-side link devices; The detection response is received on the first beam, the detection response including beam information of at least one of the plurality of beams; The beam information is determined based on a mapping between a first resource for the sidelink discovery probe message and a second resource for the probe response, the mapping being used to determine at least one beam that the first sidelink device will use to send the sidelink discovery message; as well as The sidelink discovery message is transmitted on at least one beam indicated in the beam information.

29. The apparatus of claim 28, further comprising one or more antennas coupled to the one or more processors, wherein, The first sidelink device corresponds to the advertised user equipment (UE), and the sidelink discovery message includes an existence announcement message.

30. The apparatus of claim 28, further comprising one or more antennas coupled to the one or more processors, wherein, The first sidelink device corresponds to the discoverer user equipment (UE), and the sidelink discovery message includes a solicitation message.

31. The apparatus according to claim 28, wherein, The one or more processors are individually or collectively configured to determine the occurrence of the aperiodic triggering of the sidelink discovery probe message, and in response to the occurrence of the aperiodic triggering of the sidelink discovery probe message, transmit the sidelink discovery probe message via the plurality of beams including the first beam, the sidelink discovery probe message including at least a first identifier of the first sidelink device, monitor probe responses from a second sidelink device, receive the probe responses on the first beam, determine beam information based on a mapping between a first resource for the sidelink discovery probe message and a second resource for the probe responses, and transmit the sidelink discovery message on at least one beam indicated in the beam information.

32. The apparatus according to claim 31, wherein, The one or more processors are individually or collectively configured to receive the sidelink discovery probe message from the first sidelink device based on the occurrence of the non-periodic trigger, send the probe response to the first sidelink device in response to the sidelink discovery probe message, and monitor the sidelink discovery messages from the first sidelink device.

33. The apparatus according to claim 28, wherein, The one or more processors are individually or collectively configured to perform the method as described in any one of claims 2-9, 11-13, 15 and 16.

34. An apparatus for performing wireless sidelink communication with a first sidelink device at a second sidelink device, comprising: One or more memory units; as well as One or more processors coupled to the one or more memories, the one or more processors being configured to enable the second side link device: A sidelink discovery probe message is received from the first sidelink device based on the occurrence of non-periodic triggering. The sidelink discovery probe message is configured to identify the first sidelink device and also includes a beam indication corresponding to at least one of a plurality of beams. The non-periodic triggering is based on a beam refinement process. In response to the sidelink discovery probe message, a probe response is sent to the first sidelink device; as well as Monitor sidelink discovery messages sent from the first sidelink device on at least one beam determined based on a mapping between a first resource for the sidelink discovery probe message and a second resource for the probe response.

35. The apparatus of claim 34, further comprising one or more antennas coupled to the one or more processors, wherein, The sidelink discovery message includes an existence declaration message from the sidelink device, and wherein the one or more processors are further configured to cause the second sidelink device to: Receive the presence declaration message from the declared side link device; and Send a connection request to the declared side link device.

36. The apparatus of claim 34, further comprising one or more antennas coupled to the one or more processors, wherein, The sidelink discovery message includes a solicitation message from the discoverer sidelink device, and wherein the one or more processors are further configured to cause the second sidelink device to: Receive the solicitation message from the discoverer sidelink device; and Send a response to the solicitation message.

37. The apparatus according to claim 34, wherein, The one or more processors are individually or collectively configured to perform the method as described in any one of claims 18-21.

38. A non-transitory computer-readable storage medium comprising computer-executable code at a first sidelink device, the computer-executable code, when executed, causing one or more processors of the first sidelink device to: In response to the occurrence of an aperiodic triggering of a sidelink discovery probe message, the sidelink discovery probe message is transmitted via a plurality of beams including a first beam, the aperiodic triggering being based on a beam refinement process, and the sidelink discovery probe message including at least a first identifier of the first sidelink device. Monitor probe responses from second-side link devices; The detection response is received on the first beam, the detection response including beam information of at least one of the plurality of beams; The beam information is determined based on a mapping between a first resource for the sidelink discovery probe message and a second resource for the probe response, the mapping being used to determine at least one beam that the first sidelink device will use to send the sidelink discovery message; as well as The sidelink discovery message is transmitted on at least one beam indicated in the beam information.

39. The non-transitory computer-readable storage medium according to claim 38, wherein, The first sidelink device corresponds to the advertised user equipment (UE), and the sidelink discovery message includes an existence announcement message.

40. The non-transitory computer-readable storage medium according to claim 38, wherein, The first sidelink device corresponds to the discoverer user equipment (UE), and the sidelink discovery message includes a solicitation message.

41. The non-transitory computer-readable storage medium according to claim 38, wherein, When executed, the computer executable code causes the one or more processors to perform the method as described in any one of claims 2-9, 11-13, 15, and 16.

42. A non-transitory computer-readable storage medium comprising computer-executable code for wireless sidelink communication with a first sidelink device at a second sidelink device, wherein the computer-executable code, when executed, causes one or more processors of the second sidelink device to: A sidelink discovery probe message is received from the first sidelink device based on the occurrence of non-periodic triggering. The sidelink discovery probe message is configured to identify the first sidelink device and also includes a beam indication corresponding to at least one of a plurality of beams. The non-periodic triggering is based on a beam refinement process. In response to the sidelink discovery probe message, a probe response is sent to the first sidelink device; as well as Monitor sidelink discovery messages sent from the first sidelink device on at least one beam determined based on a mapping between a first resource for the sidelink discovery probe message and a second resource for the probe response.

43. The non-transitory computer-readable storage medium according to claim 42, wherein, The sidelink discovery message includes an existence declaration message from the sidelink device, and wherein the computer executable code, when executed, causes one or more processors of the second sidelink device to: Receive the presence declaration message from the declared side link device; and Send a connection request to the declared side link device.

44. The non-transitory computer-readable storage medium according to claim 42, wherein, The sidelink discovery message includes a solicitation message from the discoverer sidelink device, and wherein the computer executable code, when executed, causes one or more processors of the second sidelink device to: Receive the solicitation message from the discoverer sidelink device; and Send a response to the solicitation message.

45. The non-transitory computer-readable storage medium according to claim 42, wherein, When executed, the computer executable code causes the one or more processors to perform the method as described in any one of claims 18-21.

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