Method and apparatus for expanding quasi-colocation (QCL) signaling to cover varied scenarios
Certain aspects of the present disclosure relate to methods and apparatus for providing quasi-colocation (QCL) signaling for reference signals (RS) and channels across scenarios involving multiple cells, such as coordinated multipoint (CoMP) scenarios in which multiple transmit receive points (TRPs) or integrated access and backhaul (IAB) nodes each have their own cell ID.
1. A method for wireless communications by a user equipment (UE), comprising:
obtaining quasi-colocation (QCL) information indicating QCL assumptions for one or more types of reference signals (RS) associated with different cell identifications (IDs) including at least one non-serving cell ID; and
receiving, based on the QCL information, at least a first RS of the one or more types of RSs associated with a first cell ID of the different cell IDs, wherein the first RS is quasi-colocated with a second RS of the one or more types of RSs associated with a second cell ID of the different cell IDs.
2. The method of claim 1 , wherein receiving the first RS comprises performing measurements on the first RS.
3. The method of claim 2 , further comprising processing a channel, associated with the second RS, based on the measurements performed on the first RS and the QCL information.
4. The method of claim 1 , wherein the different cell IDs are associated with multiple cells operating in a same frequency bandwidth.
5. The method of claim 1 , wherein the QCL information is indicated via transmission configuration information (TCI) state.
6. The method of claim 1 , wherein:
the different cell IDs are associated with multiple transmit receive points (TRPs) participating in a coordinated multipoint (CoMP) scheme; and
the QCL information is provided via a TCI state that includes at least one of:
a serving cell index referring to multiple cells;
a TRP ID; or
a group ID associated with a group of TRPs.
7. The method of claim 1 , wherein the QCL information is provided via a TCI state that includes a serving cell index referring to multiple cells.
8. The method of claim 1 , wherein the different cell IDs are associated with multiple cells implementing different radio access technologies (RATs).
9. The method of claim 8 , wherein the QCL information is provided via a TCI state that includes information regarding the RATs.
10. The method of claim 1 , wherein the different cell IDs are associated with multiple integrated access and backhaul (IAB) nodes participating in a coordinated multipoint (CoMP) scheme.
11. A method for wireless communications by a network entity, comprising:
generating quasi-colocation (QCL) information indicating QCL assumptions for one or more types of reference signals (RS) associated with different cell identifications (IDs) including at least one non-serving cell ID; and
transmitting the QCL information to at least one user equipment (UE).
12. The method of claim 11 , wherein the different cell IDs are associated with multiple cells operating in a same frequency bandwidth.
13. The method of claim 11 , wherein the QCL information is indicated via transmission configuration information (TCI) state.
14. The method of claim 11 , wherein the different cell IDs are associated with multiple transmit receive points (TRPs) participating in a coordinated multipoint (CoMP) scheme.
15. The method of claim 14 , wherein the QCL information is provided via a TCI state that includes a serving cell index referring to multiple cells.
16. The method of claim 14 , wherein the QCL information is provided via a TCI state that includes at least one of a TRP ID or group ID associated with a group of TRPs.
17. The method of claim 11 , wherein the QCL information is provided via a TCI state that includes a serving cell index referring to multiple cells.
18. The method of claim 11 , wherein:
the different cell IDs are associated with multiple cells implementing different radio access technologies (RATs); and
the QCL information is provided via a TCI state that includes information regarding the RATs.
19. The method of claim 11 , wherein the different cell IDs are associated with multiple integrated access and backhaul (IAB) nodes participating in a coordinated multipoint (CoMP) scheme.
20. An apparatus for wireless communications by a user equipment (UE), comprising:
means for obtaining quasi-colocation (QCL) information indicating QCL assumptions for one or more types of reference signals (RS) associated with different cell identifications (IDs) including at least one non-serving cell ID; and
means for receiving, based on the QCL information, at least a first RS of the one or more types of RSs associated with a first cell ID of the different cell IDs, wherein the first RS is quasi-colocated with a second RS of the one or more types of RSs associated with a second cell ID of the different cell IDs.
21. The apparatus of claim 20 , wherein the means for receiving the first RS comprises means for performing measurements on the first RS.
22. The apparatus of claim 21 , further comprising means for processing a channel, associated with the second RS, based on the measurements performed on the first RS and the QCL information.
23. The apparatus of claim 20 , wherein the different cell IDs are associated with multiple cells operating in a same frequency bandwidth.
24. The apparatus of claim 20 , wherein the QCL information is indicated via transmission configuration information (TCI) state.
25. The apparatus of claim 20 , wherein:
the different cell IDs are associated with multiple transmit receive points (TRPs) participating in a coordinated multipoint (CoMP) scheme; and
the QCL information is provided via a TCI state that includes at least one of a TRP ID or group ID associated with a group of TRPs.
26. An apparatus for wireless communications by a network entity, comprising:
means for generating quasi-colocation (QCL) information indicating QCL assumptions for one or more types of reference signals (RS) associated with different cell identifications (IDs) including at least one non-serving cell ID; and
means for transmitting the QCL information to at least one user equipment (UE).
27. The apparatus of claim 26 , wherein the different cell IDs are associated with multiple cells operating in a same frequency bandwidth.
28. The apparatus of claim 26 , wherein the QCL information is indicated via transmission configuration information (TCI) state.
29. The apparatus of claim 26 , wherein the different cell IDs are associated with multiple transmit receive points (TRPs) participating in a coordinated multipoint (CoMP) scheme.
30. The apparatus of claim 29 , wherein the QCL information is provided via a TCI state that includes at least one of a TRP ID or group ID associated with a group of TRPs.