Quasi co-location type for spatially correlated synchronization signal block beams
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a repeater may receive, from a network node, a transmission configuration indication (TCI) for a plurality of synchronization signal block (SSB) beams, wherein the TCI indicates a quasi co-location (QCL) type for a spatial transmit (Tx) parameter for the plurality of SSB beams, and the QCL type for the spatial Tx parameter indicates that the plurality of SSB beams are Tx spatially correlated. The repeater may receive, from the network node, the plurality of SSB beams in accordance with the TCI, wherein the plurality of SSBs are associated with a direction of the repeater. The repeater may relay, to a user equipment (UE), the plurality of SSB beams. Numerous other aspects are described.
1. A repeater for wireless communication, comprising:
memory; and
one or more processors coupled to the memory, the memory comprising instructions executable by the one or more processors to cause the repeater to:
receive, from a network node, a transmission configuration indication (TCI) for a plurality of synchronization signal block (SSB) beams, wherein:
the TCI indicates a quasi co-location (QCL) type for a spatial transmit (Tx) parameter for the plurality of SSB beams, and
the QCL type for the spatial Tx parameter indicates that the plurality of SSB beams are Tx spatially correlated;
receive, from the network node, the plurality of SSB beams in accordance with the TCI, wherein the plurality of SSBs are associated with a direction of the repeater; and
relay, to a user equipment (UE), the plurality of SSB beams.
2. The repeater of claim 1 , wherein the instructions, executable to cause the repeater to relay the plurality of SSB beams, are executable to cause the repeater to relay the plurality of SSB beams in a plurality of different spatial directions based at least in part on a beam management configuration.
3. The repeater of claim 1 , wherein beam indices associated with the plurality of SSB beams are Tx spatially correlated in a same direction, and wherein the beam indices are defined under the QCL type for both a downlink and an uplink.
4. The repeater of claim 1 , wherein the plurality of SSB beams includes downlink beams which are to be relayed from the repeater to the UE.
5. The repeater of claim 1 , wherein the plurality of SSB beams includes uplink beams which are to be relayed by the repeater from the UE.
6. The repeater of claim 1 , wherein the memory further comprises instructions executable by the one or more processors to cause the repeater to:
transmit, to the network node, a capability indication that indicates that the repeater is capable of relaying a signal with a defined latency in relation to a cyclic prefix length of the signal.
7. The repeater of claim 1 , wherein the memory further comprises instructions executable by the one or more processors to cause the repeater to:
receive, from the UE, a random access channel (RACH) occasion on an indicated time slot of an applicable SSB index associated with a selected SSB beam of the plurality of SSB beams; and
relay, to the network node, the RACH occasion based at least in part on the direction, wherein the RACH occasion indicates that the UE is located within an area of the repeater.
8. The repeater of claim 1 , wherein a quantity associated with the plurality of SSB beams is based at least in part on a quantity of UEs in a cell.
9. The repeater of claim 1 , wherein the QCL type indicates other configuration parameters including: parent and child beam information, and channel information.
10. The repeater of claim 1 , wherein the repeater is configured to relay the plurality of SSB beams to the UE in an outdoor-to-indoor scenario or in an outdoor-to-outdoor scenario.
11. A network node for wireless communication, comprising:
memory; and
one or more processors coupled to the memory, the memory comprising instructions executable by the one or more processors to cause the network node to:
transmit, to a repeater, a transmission configuration indication (TCI) for a plurality of synchronization signal block (SSB) beams, wherein:
the TCI indicates a quasi co-location (QCL) type for a spatial transmit (Tx) parameter for the plurality of SSB beams, and
the QCL type for the spatial Tx parameter indicates that the plurality of SSB beams are Tx spatially correlated; and
transmit, to the repeater for relaying to a user equipment (UE), the plurality of SSB beams in accordance with the TCI, wherein the plurality of SSBs are associated with a direction of the repeater.
12. The network node of claim 11 , wherein beam indices associated with the plurality of SSB beams are Tx spatially correlated in a same direction, and wherein the beam indices are defined under the QCL type for both a downlink and an uplink.
13. The network node of claim 11 , wherein:
the plurality of SSB beams includes downlink beams which are to be relayed from the repeater to the UE; or
the plurality of SSB beams includes uplink beams which are to be relayed by the repeater from the UE.
14. The network node of claim 11 , wherein the memory further comprises instructions executable by the one or more processors to cause the network node to:
receive, from the repeater, a capability indication that indicates that the repeater is capable of relaying a signal with a defined latency in relation to a cyclic prefix length of the signal.
15. The network node of claim 11 , wherein the memory further comprises instructions executable by the one or more processors to cause the network node to:
receive, from the UE via the repeater, a random access channel (RACH) occasion on an indicated time slot of an applicable SSB index associated with a selected SSB beam of the plurality of SSB beams, wherein the RACH occasion indicates that the UE is located within an area of the repeater.
16. A method of wireless communication performed by a repeater, comprising:
receiving, from a network node, a transmission configuration indication (TCI) for a plurality of synchronization signal block (SSB) beams, wherein:
the TCI indicates a quasi co-location (QCL) type for a spatial transmit (Tx) parameter for the plurality of SSB beams, and
the QCL type for the spatial Tx parameter indicates that the plurality of SSB beams are Tx spatially correlated;
receiving, from the network node, the plurality of SSB beams in accordance with the TCI, wherein the plurality of SSBs are associated with a direction of the repeater; and
relaying, to a user equipment (UE), the plurality of SSB beams.
17. The method of claim 16 , wherein relaying the plurality of SSB beams comprises relaying the plurality of SSB beams in a plurality of different spatial directions based at least in part on a beam management configuration.
18. The method of claim 16 , wherein beam indices associated with the plurality of SSB beams are Tx spatially correlated in a same direction, and wherein the beam indices are defined under the QCL type for both a downlink and an uplink.
19. The method of claim 16 , wherein the plurality of SSB beams includes downlink beams which are to be relayed from the repeater to the UE.
20. The method of claim 16 , wherein the plurality of SSB beams includes uplink beams which are to be relayed by the repeater from the UE.
21. The method of claim 16 , further comprising:
transmitting, to the network node, a capability indication that indicates that the repeater is capable of relaying a signal with a defined latency in relation to a cyclic prefix length of the signal.
22. The method of claim 16 , further comprising:
receiving, from the UE, a random access channel (RACH) occasion on an indicated time slot of an applicable SSB index associated with a selected SSB beam of the plurality of SSB beams; and
relaying, to the network node, the RACH occasion based at least in part on the direction, wherein the RACH occasion indicates that the UE is located within an area of the repeater.
23. The method of claim 16 , wherein a quantity associated with the plurality of SSB beams is based at least in part on a quantity of UEs in a cell.
24. The method of claim 16 , wherein the QCL type indicates other configuration parameters including: parent and child beam information, and channel information.
25. The method of claim 16 , wherein the repeater is configured to relay the plurality of SSB beams to the UE in an outdoor-to-indoor scenario or in an outdoor-to-outdoor scenario.
26. A method of wireless communication performed by a network node, comprising:
transmitting, to a repeater, a transmission configuration indication (TCI) for a plurality of synchronization signal block (SSB) beams, wherein:
the TCI indicates a quasi co-location (QCL) type for a spatial transmit (Tx) parameter for the plurality of SSB beams, and
the QCL type for the spatial Tx parameter indicates that the plurality of SSB beams are Tx spatially correlated; and
transmitting, to the repeater for relaying to a user equipment (UE), the plurality of SSB beams in accordance with the TCI, wherein the plurality of SSBs are associated with a direction of the repeater.
27. The method of claim 26 , wherein beam indices associated with the plurality of SSB beams are Tx spatially correlated in a same direction, and wherein the beam indices are defined under the QCL type for both a downlink and an uplink.
28. The method of claim 26 , wherein:
the plurality of SSB beams includes downlink beams which are to be relayed from the repeater to the UE; or
the plurality of SSB beams includes uplink beams which are to be relayed by the repeater from the UE.
29. The method of claim 26 , further comprising:
receiving, from the repeater, a capability indication that indicates that the repeater is capable of relaying a signal with a defined latency in relation to a cyclic prefix length of the signal.
30. The method of claim 26 , further comprising:
receiving, from the UE via the repeater, a random access channel (RACH) occasion on an indicated time slot of an applicable SSB index associated with a selected SSB beam of the plurality of SSB beams, wherein the RACH occasion indicates that the UE is located within an area of the repeater.