Sidelink FR2 inter-UE interference management

1. A method of wireless communication of a first user equipment (UE), comprising:

determining to communicate with a second UE;

maintaining or establishing a radio resource control (RRC) connection with a third UE upon a determination of a potential interference between the first UE and the third UE, the potential interference being at least one of a received interference in which the first UE receives interference from the third UE as a result of communication between the third UE and a fourth UE, or a transmitted interference in which the first UE causes interference to the third UE as a result of communication between the first UE and the second UE; and

communicating, with the third UE through the RRC connection, interference mitigation information associated with at least one of the communication between the first UE and the second UE or the communication between the third UE and the fourth UE, wherein the interference mitigation information comprises at least one of a reference signal received power (RSRP) associated with communication received at the first UE from the second UE, an RSRP associated with communication received at the first UE from the third UE, or an RSRP associated with communication received at the third UE from the first UE.

2. The method of claim 1 , further comprising communicating with the second UE, wherein one of the transmitted interference caused by the first UE to the third UE during the communication between the first UE and the second UE is based on the communicated interference mitigation information, or an interference received at the first UE from the third UE during the communication between the first UE and the second UE is based on the communicated interference mitigation information.

3. The method of claim 1 , wherein the maintaining or establishing the RRC connection with the third UE comprises:

maintaining the RRC connection when there is an existing RRC connection between the first UE and the third UE; and

establishing the RRC connection when there is not an existing RRC connection between the first UE and the third UE.

4. The method of claim 1 , further comprising determining, after determining to communicate with the second UE, the third UE that would at least one of receive interference from the first UE as a result of the communication between the first UE and the second UE or cause interference to the first UE as a result of the communication between the third UE and the fourth UE.

5. The method of claim 4 , further comprising:

transmitting beam training (BT) reference signals (RSs) (BT-RSs) for a BT procedure; and

receiving, based on the BT procedure, a discovery announcement from the third UE,

wherein the first UE determines the third UE based on the received discovery announcement from the third UE.

6. The method of claim 4 , further comprising:

transmitting beam training (BT) reference signals (RSs) (BT-RSs) for a BT procedure;

transmitting a discovery announcement after transmitting the BT-RSs for the BT procedure; and

receiving, in response to the transmitted discovery announcement, a discovery response from the third UE,

wherein the first UE determines the third UE based on the received discovery response from the third UE.

7. The method of claim 1 , wherein the interference mitigation information comprises at least one of information indicating time-frequency resources for expected communication receptions by the first UE from the second UE, information indicating time-frequency resources for expected communication transmissions from the first UE to the second UE, information indicating time-frequency resources for expected communication receptions by the third UE from the fourth UE, or information indicating time-frequency resources for expected communication transmissions from the third UE to the fourth UE.

8. The method of claim 1 , wherein the interference mitigation information comprises information indicating a change in communication traffic for the communication between the first UE and the second UE.

9. The method of claim 8 , wherein the indicated change in the communication traffic comprises a change in a traffic load or a change in traffic periodicity.

10. The method of claim 8 , wherein the indicated change in the communication traffic comprises at least one of information indicating an end of service between the first UE and the second UE, or potential available resources that were being used by the first UE and the second UE for the communication.

11. The method of claim 1 , further comprising negotiating a resource partition between a first set of time-frequency resources for the communication between the first UE and the second UE and a second set of time-frequency resources for the communication between the third UE and the fourth UE, the first set of time-frequency resources and the second set of time-frequency resources being non-overlapping, wherein the interference mitigation information is communicated in association with the negotiation.

12. The method of claim 1 , wherein the interference mitigation information comprises information indicating at least one of a first set of time-frequency resources subject to potential interference from the third UE in which the time-frequency resources are utilized by the first UE to receive communication from the second UE, or a second set of time-frequency resources subject to potential interference from the first UE in which the time-frequency resources are utilized by the third UE to receive communication from the fourth UE.

13. The method of claim 12 , further comprising excluding, based on the communicated interference mitigation information, use of at least a subset of the second set of time-frequency resources for the communication with the second UE.

14. The method of claim 13 , wherein the excluding use of at least the subset of the second set of time-frequency resources for the communication with the second UE is based on a priority of the communication with the second UE.

15. The method of claim 13 , wherein the excluding use of at least the subset of the second set of time-frequency resources for the communication with the second UE is based on whether the RSRP associated with the communication received at the first UE from the second UE is greater than a scalar value p times the RSRP associated with the communication received at the first UE from the third UE.

16. The method of claim 12 , wherein the interference mitigation information further comprises information indicating that the third UE cannot exclude use of the first set of time-frequency resources for the communication with the fourth UE, the method further comprising reselecting, based on the communicated interference mitigation information, at least a subset of the first set of time-frequency resources for the communication with the second UE.

17. The method of claim 1 , wherein the interference mitigation information comprises information indicating a change in a link quality for the communication between the first UE and the second UE.

18. The method of claim 1 , wherein the interference mitigation information is communicated periodically based on a timer.

19. The method of claim 1 , further comprising determining a change in a traffic load of the communication with the second UE or a change in a link quality of the communication with the second UE, wherein the interference mitigation information is communicated based on the determined change in the traffic load or the link quality.

20. An apparatus for wireless communication of a first user equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to:

determine to communicate with a second UE;

maintain or establish a radio resource control (RRC) connection with a third UE upon a determination of a potential interference between the first UE and the third UE, the potential interference being at least one of a received interference in which the first UE receives interference from the third UE as a result of communication between the third UE and a fourth UE, or a transmitted interference in which the first UE causes interference to the third UE as a result of communication between the first UE and the second UE; and

communicate, with the third UE through the RRC connection, interference mitigation information associated with at least one of the communication between the first UE and the second UE or the communication between the third UE and the fourth UE, wherein the interference mitigation information comprises at least one of a reference signal received power (RSRP) associated with communication received at the first UE from the second UE, an RSRP associated with communication received at the first UE from the third UE, or an RSRP associated with communication received at the third UE from the first UE.

21. The apparatus of claim 20 , wherein the at least one processor is further configured to communicate with the second UE, wherein one of the transmitted interference caused by the first UE to the third UE during the communication between the first UE and the second UE is based on the communicated interference mitigation information, or an interference received at the first UE from the third UE during the communication between the first UE and the second UE is based on the communicated interference mitigation information.

22. The apparatus of claim 20 , wherein to maintain or establish the RRC connection with the third UE the at least one processor is further configured to:

maintain the RRC connection when there is an existing RRC connection between the first UE and the third UE; and

establish the RRC connection when there is not an existing RRC connection between the first UE and the third UE.

23. The apparatus of claim 20 , wherein the at least one processor is further configured to determine, after determining to communicate with the second UE, the third UE that would at least one of receive interference from the first UE as a result of the communication between the first UE and the second UE or cause interference to the first UE as a result of the communication between the third UE and the fourth UE.

24. The apparatus of claim 23 , wherein the at least one processor is further configured to:

transmit beam training (BT) reference signals (RSs) (BT-RSs) for a BT procedure; and

receive, based on the BT procedure, a discovery announcement from the third UE,

wherein the first UE determines the third UE based on the received discovery announcement from the third UE.

25. The apparatus of claim 23 , wherein the at least one processor is further configured to:

transmit beam training (BT) reference signals (RSs) (BT-RSs) for a BT procedure;

transmit a discovery announcement after transmitting the BT-RSs for the BT procedure; and

receive, in response to the transmitted discovery announcement, a discovery response from the third UE,

wherein the first UE determines the third UE based on the received discovery response from the third UE.

26. The apparatus of claim 20 , wherein the interference mitigation information comprises at least one of information indicating time-frequency resources for expected communication receptions by the first UE from the second UE, information indicating time-frequency resources for expected communication transmissions from the first UE to the second UE, information indicating time-frequency resources for expected communication receptions by the third UE from the fourth UE, or information indicating time-frequency resources for expected communication transmissions from the third UE to the fourth UE.

27. The apparatus of claim 20 , wherein the interference mitigation information comprises information indicating a change in communication traffic for the communication between the first UE and the second UE.

28. The apparatus of claim 27 , wherein the indicated change in the communication traffic comprises a change in a traffic load or a change in traffic periodicity.

29. The apparatus of claim 27 , wherein the indicated change in the communication traffic comprises at least one of information indicating an end of service between the first UE and the second UE, or potential available resources that were being used by the first UE and the second UE for the communication.

30. The apparatus of claim 20 , wherein the at least one processor is further configured to negotiate a resource partition between a first set of time-frequency resources for the communication between the first UE and the second UE and a second set of time-frequency resources for the communication between the third UE and the fourth UE, the first set of time-frequency resources and the second set of time-frequency resources being non-overlapping, wherein the at least one processor is configured to communicate the interference mitigation information in association with the negotiation.

31. The apparatus of claim 20 , wherein the interference mitigation information comprises information indicating at least one of a first set of time-frequency resources subject to potential interference from the third UE in which the time-frequency resources are utilized by the first UE to receive communication from the second UE, or a second set of time-frequency resources subject to potential interference from the first UE in which the time-frequency resources are utilized by the third UE to receive communication from the fourth UE.

32. The apparatus of claim 31 , wherein the at least one processor is further configured to exclude, based on the communicated interference mitigation information, use of at least a subset of the second set of time-frequency resources for the communication with the second UE.

33. The apparatus of claim 32 , wherein the at least one processor is configured to exclude the use of at least the subset of the second set of time-frequency resources for the communication with the second UE based on a priority of the communication with the second UE.

34. The apparatus of claim 32 , wherein the at least one processor is configured to exclude the use of at least the subset of the second set of time-frequency resources for the communication with the second UE based on whether the RSRP associated with the communication received at the first UE from the second UE is greater than a scalar value p times the RSRP associated with the communication received at the first UE from the third UE.

35. The apparatus of claim 31 , wherein the interference mitigation information further comprises information indicating that the third UE cannot exclude use of the first set of time-frequency resources for the communication with the fourth UE, the at least one processor further configured to reselect, based on the communicated interference mitigation information, at least a subset of the first set of time-frequency resources for the communication with the second UE.

36. The apparatus of claim 20 , wherein the interference mitigation information comprises information indicating a change in a link quality for the communication between the first UE and the second UE.

37. The apparatus of claim 20 , wherein the at least one processor is configured to communicate the interference mitigation information periodically based on a timer.

38. The apparatus of claim 20 , wherein the at least one processor is further configured to determine a change in a traffic load of the communication with the second UE or a change in a link quality of the communication with the second UE, wherein the at least one processor is configured to communicate the interference mitigation information based on the determined change in the traffic load or the link quality.

39. An apparatus for wireless communication of a first user equipment (UE), comprising:

means for determining to communicate with a second UE;

means for maintaining or means for establishing a radio resource control (RRC) connection with a third UE upon a determination of a potential interference between the first UE and the third UE, the potential interference being at least one of a received interference in which the first UE receives interference from the third UE as a result of communication between the third UE and a fourth UE, or a transmitted interference in which the first UE causes interference to the third UE as a result of communication between the first UE and the second UE; and

means for communicating, with the third UE through the RRC connection, interference mitigation information associated with at least one of the communication between the first UE and the second UE or the communication between the third UE and the fourth UE, wherein the interference mitigation information comprises at least one of a reference signal received power (RSRP) associated with communication received at the first UE from the second UE, an RSRP associated with communication received at the first UE from the third UE, or an RSRP associated with communication received at the third UE from the first UE.

40. The apparatus of claim 39 , further comprising means for communicating with the second UE, wherein one of the transmitted interference caused by the first UE to the third UE during the communication between the first UE and the second UE is based on the communicated interference mitigation information, or an interference received at the first UE from the third UE during the communication between the first UE and the second UE is based on the communicated interference mitigation information.

41. The apparatus of claim 39 , wherein the means for maintaining or the means for establishing the RRC connection with the third UE is further configured to:

maintain the RRC connection when there is an existing RRC connection between the first UE and the third UE; and

establish the RRC connection when there is not an existing RRC connection between the first UE and the third UE.

42. The apparatus of claim 39 , further comprising means for determining, after determining to communicate with the second UE, the third UE that would at least one of receive interference from the first UE as a result of the communication between the first UE and the second UE or cause interference to the first UE as a result of the communication between the third UE and the fourth UE.

43. The apparatus of claim 42 , further comprising:

means for transmitting beam training (BT) reference signals (RSs) (BT-RSs) for a BT procedure; and

means for receiving, based on the BT procedure, a discovery announcement from the third UE,

wherein the first UE determines the third UE based on the received discovery announcement from the third UE.

44. The apparatus of claim 42 , further comprising:

means for transmitting beam training (BT) reference signals (RSs) (BT-RSs) for a BT procedure;

means for transmitting a discovery announcement after transmitting the BT-RSs for the BT procedure; and

means for receiving, in response to the transmitted discovery announcement, a discovery response from the third UE,

wherein the first UE determines the third UE based on the received discovery response from the third UE.

45. The apparatus of claim 39 , wherein the interference mitigation information comprises at least one of information indicating time-frequency resources for expected communication receptions by the first UE from the second UE, information indicating time-frequency resources for expected communication transmissions from the first UE to the second UE, information indicating time-frequency resources for expected communication receptions by the third UE from the fourth UE, or information indicating time-frequency resources for expected communication transmissions from the third UE to the fourth UE.

46. The apparatus of claim 39 , wherein the interference mitigation information comprises information indicating a change in communication traffic for the communication between the first UE and the second UE.

47. The apparatus of claim 46 , wherein the indicated change in the communication traffic comprises a change in a traffic load or a change in traffic periodicity.

48. The apparatus of claim 46 , wherein the indicated change in the communication traffic comprises at least one of information indicating an end of service between the first UE and the second UE, or potential available resources that were being used by the first UE and the second UE for the communication.

49. The apparatus of claim 39 , further comprising means for negotiating a resource partition between a first set of time-frequency resources for the communication between the first UE and the second UE and a second set of time-frequency resources for the communication between the third UE and the fourth UE, the first set of time-frequency resources and the second set of time-frequency resources being non-overlapping, wherein the interference mitigation information is communicated in association with the negotiation.

50. The apparatus of claim 39 , wherein the interference mitigation information comprises information indicating at least one of a first set of time-frequency resources subject to potential interference from the third UE in which the time-frequency resources are utilized by the first UE to receive communication from the second UE, or a second set of time-frequency resources subject to potential interference from the first UE in which the time-frequency resources are utilized by the third UE to receive communication from the fourth UE.

51. The apparatus of claim 50 , further comprising means for excluding, based on the communicated interference mitigation information, use of at least a subset of the second set of time-frequency resources for the communication with the second UE.

52. The apparatus of claim 51 , wherein the excluding use of at least the subset of the second set of time-frequency resources for the communication with the second UE is based on a priority of the communication with the second UE.

53. The apparatus of claim 51 , wherein the excluding use of at least the subset of the second set of time-frequency resources for the communication with the second UE is based on whether the RSRP associated with the communication received at the first UE from the second UE is greater than a scalar value p times the RSRP associated with the communication received at the first UE from the third UE.

54. The apparatus of claim 50 , wherein the interference mitigation information further comprises information indicating that the third UE cannot exclude use of the first set of time-frequency resources for the communication with the fourth UE, the apparatus further comprising means for reselecting, based on the communicated interference mitigation information, at least a subset of the first set of time-frequency resources for the communication with the second UE.

55. The apparatus of claim 39 , wherein the interference mitigation information comprises information indicating a change in a link quality for the communication between the first UE and the second UE.

56. The apparatus of claim 39 , further comprising means for determining a change in a traffic load of the communication with the second UE or a change in a link quality of the communication with the second UE, wherein the interference mitigation information is communicated based on the determined change in the traffic load or the link quality.

57. A non-transitory computer-readable medium storing computer executable code, the code when executed by at least one processor of a first user equipment (UE) causes the at least one processor to:

determine to communicate with a second UE;

maintain or establish a radio resource control (RRC) connection with a third UE upon a determination of a potential interference between the first UE and the third UE, the potential interference being at least one of a received interference in which the first UE receives interference from the third UE as a result of communication between the third UE and a fourth UE, or a transmitted interference in which the first UE causes interference to the third UE as a result of communication between the first UE and the second UE; and

communicate, with the third UE through the RRC connection, interference mitigation information associated with at least one of the communication between the first UE and the second UE or the communication between the third UE and the fourth UE, wherein the interference mitigation information comprises at least one of a reference signal received power (RSRP) associated with communication received at the first UE from the second UE, an RSRP associated with communication received at the first UE from the third UE, or an RSRP associated with communication received at the third UE from the first UE.

58. The method of claim 1 , wherein determining to communicate with the second UE comprises determining to communicate with the second UE via frequency range 2 (FR2), and wherein the interference mitigation information is communicated with the third UE through the RRC connection via the FR2.