Reference signal for remote interference management

1. A method for wireless communication by a first base station (BS), the method comprising:

transmitting a remote interference mitigation reference signal (RIM-RS) to indicate potential interference to one or more second BSs, wherein the RIM-RS is different than a synchronization signal/physical broadcast channel (SS/PBCH) block, a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), a positioning reference signal (PRS), a physical random access channel (PRACH), and a sounding reference signal (SRS); and

receiving remote interference information from at least one of the one or more second BSs in response to the RIM-RS.

2. The method of claim 1 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS multiple times according to a pattern in time.

3. The method of claim 2 , wherein transmitting the RIM-RS multiple times according to the pattern in time comprises transmitting the RIM-RS periodically in time.

4. The method of claim 3 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS in a last symbol in time allocated to downlink communication in a slot according to the periodicity.

5. The method of claim 1 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS in a first symbol in time allocated to uplink communication in a slot.

6. The method of claim 1 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS periodically.

7. The method of claim 1 , wherein transmitting the RIM-RS periodically comprises transmitting the RIM-RS periodically based on an amount of data transmissions from the first BS.

8. The method of claim 1 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS through only a single antenna port of the first BS.

9. The method of claim 1 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS through multiple antenna ports of the first BS one at a time over time.

10. The method of claim 1 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS on a single beam at below 6 GHz.

11. The method of claim 10 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS on a separate antenna of the first BS than used for data transmissions.

12. The method of claim 1 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS on multiple beams at below 6 GHz.

13. The method of claim 1 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS on multiple beams at above 6 GHz.

14. The method of claim 1 , wherein transmitting the RIM-RS comprises transmitting the RIM-RS on a set of active beams of a plurality of beams the first BS is configured to transmit.

15. A method for wireless communication by a first base station (BS), the method comprising:

receiving a remote interference mitigation reference signal (RIM-RS) from a second BS, wherein the RIM-RS is different than a synchronization signal/physical broadcast channel (SS/PBCH) block, a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), a positioning reference signal (PRS), a physical random access channel (PRACH), and a sounding reference signal (SRS);

performing interference measurement of the RIM-RS to determine remote interference caused by the second BS based on the RIM-RS being associated with the second BS; and

transmitting remote interference information to the second BS.

16. The method of claim 15 , wherein the RIM-RS comprises receiving the RS multiple times, further comprising:

determining a pattern in time of the RIM-RS received multiple times; and

determining the RIM-RS is associated with the second BS based on the pattern in time of the RIM-RS.

17. The method of claim 16 , wherein receiving the RIM-RS multiple times according to the pattern in time comprises receiving the RIM-RS periodically in time.

18. A method for wireless communication by a first base station (BS), the method comprising:

receiving a reference signal (RS) from a second BS, wherein receiving the RS comprises receiving a physical random access channel (PRACH);

transmitting a random access response (RAR) in response to receiving the PRACH;

determining the PRACH is associated with the second BS when a response to the RAR is not received within a time period;

performing interference measurement corresponding to interference from the second BS based on the RS being associated with the second BS; and

transmitting remote interference information to the second BS in response to the RS.

19. The method of claim 15 , wherein receiving the RIM-RS comprises receiving the RIM-RS in a last symbol in time allocated to downlink communication in a slot.

20. The method of claim 15 , wherein receiving the RIM-RS comprises receiving the RIM-RS in a first symbol in time allocated to uplink communication in a slot.

21. The method of claim 15 , further comprising performing interference management based on the interference measurement to reduce interference at the first BS from the second BS.

22. A first base station (BS) comprising:

a memory comprising computer executable code stored thereon; and

a processor coupled to the memory, the processor being configured to execute the computer executable code and cause the first BS to:

transmit a remote interference mitigation reference signal (RIM-RS) to indicate potential interference to one or more second BSs, wherein the RIM-RS is different than a synchronization signal/physical broadcast channel (SS/PBCH) block, a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), a positioning reference signal (PRS), a physical random access channel (PRACH), and a sounding reference signal (SRS); and

receive remote interference information from at least one of the one or more second BSs in response to the RIM-RS.

23. A first base station (BS) comprising:

a memory comprising computer executable code stored thereon; and

a processor coupled to the memory, the processor being configured to execute the computer executable code and cause the first BS to:

receive a remote interference mitigation reference signal (RIM-RS) from a second BS, wherein the RIM-RS is different than a synchronization signal/physical broadcast channel (SS/PBCH) block, a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), a positioning reference signal (PRS), a physical random access channel (PRACH), and a sounding reference signal (SRS);

performing interference measurement of the RIM-RS to determine remote interference caused by the second BS based on the RIM-RS being associated with the second BS;

perform interference measurement corresponding to interference from the second BS based on the RS being associated with the second BS; and

transmit remote interference information to the second BS in response to the RS.

24. A method for wireless communication by a first base station (BS), the method comprising:

transmitting a reference signal (RS) to indicate potential interference to one or more second BSs, wherein transmitting the RS comprises transmitting a physical random access channel (PRACH) transmission;

receiving a random access response (RAR) in response to the PRACH transmission;

refraining from transmitting a response to the RAR to indicate the PRACH transmission is associated with the first BS; and

receiving remote interference information from at least one of the one or more second BSs in response to the RS.

25. The method of claim 1 , wherein the remote interference information indicates potential interference by downlink transmission of the first BS to an uplink transmission to the second BS.

26. The method of claim 25 , wherein the first BS and the second BS have an aligned time division duplexing (TDD) configuration, and wherein the downlink transmission by the first BS is delayed by a duration longer than a guard period of the TDD configuration.