Cross-link interference mitigation for full-duplex random access
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive information indicating a reference signal resource associated with detecting cross-link interference associated with transmitting a random access channel (RACH) message on full duplex resources. The first UE may transmit a RACH message on a selected RACH occasion, wherein the selected RACH occasion is selected based at least in part on whether a reference signal transmitted by a neighbor UE of the first UE has been detected in association with the selected RACH occasion. Numerous other aspects are described.
1. A method of wireless communication performed by a first user equipment (UE), comprising:
receiving, from a network node, remaining minimum system information indicating:
an association, between a time and frequency resource and a spatial configuration, associated with a reference signal resource associated with detecting cross-link interference associated with transmitting a random access channel (RACH) message on full duplex resources, and
a full-duplex RACH occasion corresponding to the association;
transmitting the RACH message on the full-duplex RACH occasion in a frequency division multiplex (FDM) mode when the first UE does not detect a reference signal, associated with a synchronization signal block or a channel state information reference signal beam, on the reference signal resource that overlaps in time with the full-duplex RACH occasion; and
transmitting the RACH message on a second RACH occasion in the FDM mode, different from the full-duplex RACH occasion, when the first UE detects the reference signal that overlaps in time with the full-duplex RACH occasion.
2. The method of claim 1 , wherein the full-duplex RACH occasion overlaps with a resource for a downlink communication of a neighbor UE to the network node.
3. The method of claim 1 , further comprising:
selecting the full-duplex RACH occasion based at least in part on the first UE having received no reference signal associated with the synchronization signal block.
4. The method of claim 1 , further comprising:
receiving the reference signal,
wherein the RACH message is transmitted on the full-duplex RACH occasion.
5. The method of claim 1 , wherein the RACH message is associated with initial access.
6. The method of claim 1 , wherein the reference signal resource is for a sounding reference signal.
7. A method of wireless communication performed by a network node, comprising:
transmitting, to a set of first user equipments (UEs) and based at least in part on an initial access procedure to be performed by a second UE of a set of second UEs that are in communication with the network node, configuration information comprising an uplink reference signal configuration indicating:
a sequence of a periodic uplink reference signal,
parameters for transmission of the periodic uplink reference signal, and
a reference signal resource associated with detecting cross-link interference associated with transmitting a random access channel (RACH) message on full duplex resources, wherein the cross-link interference is between the RACH message and downlink communications of the set of first UEs;
transmitting, to the set of second UEs, remaining minimum system information indicating:
an association, between a time and frequence resource and a spatial resource, associated with the reference signal resource, and
a full-duplex RACH occasion corresponding to the association;
receiving, from the second UE and on the reference signal resource, the RACH message on the full-duplex RACH occasion in a frequency division multiplex (FDM) mode when the first UE does not detect a reference signal associated with a synchronization signal block or a channel state information reference signal beam that overlaps in time with the full-duplex RACH occasion; and
receiving the RACH message on a second RACH occasion in the FDM mode, different from the full-duplex RACH occasion, when the first UE detects the reference signal that overlaps in time with the full-duplex RACH occasion.
8. The method of claim 7 , wherein the downlink communications are associated with a threshold priority level.
9. The method of claim 7 , wherein the reference signal resource comprises a same set of resources for each of the set of first UEs.
10. The method of claim 7 , wherein the reference signal resource occurs every predefined number of slots.
11. The method of claim 7 , wherein reference signals configured for another UE of the set of first UEs is associated with a same sequence that is the sequence of the periodic uplink reference signal.
12. The method of claim 7 , further comprising:
selecting the set of first UEs based at least in part on at least one of:
the downlink communications being associated with a threshold priority level, the set of first UEs being associated with the downlink communications, or location information associated with the set of first UEs.
13. The method of claim 7 , wherein a RACH occasion associated with the RACH message overlaps with a downlink communication resource of the set of first UEs in at least one of: frequency, or spatial configuration.
14. The method of claim 7 , further comprising:
performing an initial access operation with the second UE based at least in part on the RACH message.
15. A method of wireless communication performed by a first user equipment (UE), comprising:
receiving, from a network node and based at least in part on the first UE being associated with a downlink communication that has a threshold priority level, configuration information comprising an uplink reference signal configuration indicating:
a sequence of a periodic uplink reference signal,
parameters for transmission of the periodic uplink reference signal, and
a reference signal resource associated with detecting cross-link interference on a downlink communication of the first UE, wherein the cross-link interference is associated with transmission, by a neighbor UE, of a random access channel (RACH) message on full duplex resources;
transmitting a RACH message on a full-duplex RACH occasion in a frequency division multiplex (FDM) mode when the first UE does not detect a reference signal associated with a synchronization signal block or a channel state information reference signal beam that overlaps in time with the full-duplex RACH occasion; and
transmitting the RACH message on a second RACH occasion in the FDM mode, different from the full-duplex RACH occasion, when the first UE detects the reference signal that overlaps in time with the full-duplex RACH occasion.
16. The method of claim 15 , wherein the downlink communication is associated with a threshold priority level.
17. The method of claim 15 , wherein the reference signal resource occurs every predefined number of slots.
18. The method of claim 15 , wherein reference signals configured for first UE are associated with a same sequence that is the sequence of the periodic uplink reference signal.
19. A first user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
receive, from a network node, remaining minimum system information indicating:
an association, between a time and frequency resource, and a spatial configuration, associated with a reference signal resource associated with detecting cross-link interference associated with transmitting a random access channel (RACH) message on full duplex resources, and
a full-duplex RACH occasion corresponding to the association;
transmit the RACH message on the full-duplex RACH occasion in a frequency division multiplex (FDM) mode when the first UE does not detect a reference signal, associated with a synchronization signal block or a channel state information reference signal beam, on the reference signal resource that overlaps in time with the full-duplex RACH occasion; and
transmit the RACH message on a second RACH occasion in the FDM mode, different from the full-duplex RACH occasion, when the first UE detects the reference signal that overlaps in time with the full-duplex RACH occasion.
20. The first UE of claim 19 , wherein the full-duplex RACH occasion overlaps with a resource for a downlink communication of a neighbor UE to the network node.
21. The first UE of claim 19 , wherein the one or more processors are further configured to:
select the full-duplex RACH occasion based at least in part on the channel state information reference signal beam being mapped to the full-duplex RACH occasion.
22. The first UE of claim 19 , wherein the one or more processors are further configured to:
receive the reference signal,
wherein the RACH message is transmitted on the full-duplex RACH occasion.
23. The first UE of claim 19 , wherein the RACH message is associated with initial access.
24. The first UE of claim 19 , wherein the reference signal resource is for a sounding reference signal.
25. The first UE of claim 19 , wherein the one or more processors are further configured to:
perform an initial access operation with a second UE based at least in part on the RACH message.
26. The method of claim 7 , wherein the reference signal resource is for a sounding reference signal.