Methods for monitoring downlink control information coreset of a source and target cell during a handover

1 . A method for wireless communication by a user equipment (UE), comprising:

receiving signaling configuring a minimum number of control resource sets (CORESETs) and a maximum number of CORESETs that the UE is permitted to monitor in each of a target cell and a source cell during a handover procedure;

determining, subject to at least the minimum number of CORESETs and the maximum number of CORESETs that the UE is permitted to monitor in the source cell, a first number of CORESETs to monitor in the source cell when the UE is maintaining connectivity with both the source cell and the target cell during the handover procedure;

determining, subject to at least the minimum number of CORESETs and the maximum number of CORESETs that the UE is permitted to monitor in the target cell, a second number of CORESETs to monitor in the target cell when the UE is maintaining connectivity with both the source cell and the target cell during the handover procedure; and

monitoring, during the handover procedure, for physical downlink control channel (PDCCH) transmissions in the first number of CORESETs in the source cell and the second number of CORESETs in the target cell.

2 . The method of claim 1 , further comprising:

determining that a sum of the minimum number of CORESETs the UE is allowed to monitor in the target cell and the minimum number of CORESETs the UE is allowed to monitor in source cell is less than the configured maximum number; and

deciding whether to assign a remaining number of CORESETSs, received after subtracting the sum from the configured maximum number, to the target cell or the source cell based on a priority rule.

3 . The method of claim 2 , wherein the priority rule dictates one or more of the remaining number of CORESETs is assigned to the target cell.

4 . The method of claim 1 , further comprising:

detecting an overlap of monitoring occasions in different CORESETs associated with different beams; and

deciding, if the UE is not configured to support different beams simultaneously, which of the overlapping monitoring occasions to monitor based on a dropping rule.

5 . The method of claim 4 , further comprising receiving signaling configuring the UE with priority information to use when applying the dropping rule.

6 . The method of claim 5 , wherein the priority information assigns a priority to at least one:

a UE-specific search space (USS) relative to a common search space (CSS); or

the target cell relative to the source cell.

7 . The method of claim 5 , wherein the priority information assigns, within a same cell, a priority to at least one:

a USS over a CSS; or

a CSS over a USS.

8 . The method of claim 7 , wherein the priority information also prioritizes:

the target cell over the source cell; or

the source cell over the target cell.

9 . The method of claim 5 , wherein the priority information also prioritizes:

the target cell over the source cell; or

the source cell over the target cell.

10 . The method of claim 4 , further comprising:

sending a request for a certain dropping rule that prioritizes at least one or a UE-specific search space (USS) relative to a common search space (CSS) or the target cell relative to the source cell;

receiving a response to the request; and

monitoring the overlapping monitoring occasions in accordance with a dropping rule indicated in the response.

11 . The method of claim 4 , further comprising utilizing a beam of a prioritized CORESET as a default beam in case that CORESET overlaps with another CORESET in a monitoring occasion.

12 . A method for wireless communication by a network entity, comprising:

configuring a user equipment (UE) with a first number of control resource sets (CORESETs) to monitor in a source cell when the UE is maintaining connectivity with both a source cell and a target cell during a handover procedure; and

configuring the UE with a second number of CORESETs to monitor in the target cell when the UE is maintaining connectivity with both the source cell and the target cell during the handover procedure, wherein configuring the UE with the first number of CORESETs and the second number of CORESETs comprises configuring the UE with a minimum number of control resource sets (CORESETs) and a maximum number of CORESETs that the UE is permitted to monitor in each of a target cell and a source cell during the handover procedure.

13 . The method of claim 12 , further comprising configuring the UE with a dropping rule to decide, when an overlap of monitoring occasions in different CORESETs associated with different beams is detected and the UE is not configured to support different beams simultaneously, which of the overlapping monitoring occasions to monitor.

14 . The method of claim 13 , wherein configuring the UE with the dropping rule comprises configuring the UE with priority information to use when applying the dropping rule.

15 . The method of claim 14 , wherein the priority information assigns a priority to at least one:

a UE-specific search space (USS) relative to a common search space (CSS); or

the target cell relative to the source cell.

16 . The method of claim 14 , wherein the priority information assigns, within a same cell, a priority to at least one:

a USS over a CSS; or

a CSS over a USS.

17 . The method of claim 16 , wherein the priority information also prioritizes:

the target cell over the source cell; or

the source cell over the target cell.

18 . The method of claim 13 , further comprising:

receiving a request for a certain dropping rule that prioritizes at least one or a UE-specific search space (USS) relative to a common search space (CSS) or the target cell relative to the source cell; and

configuring the UE with the dropping rule in response to the request.

19 . A method for wireless communication by a user equipment (UE), comprising:

determining a number of control resource sets (CORESETs) for the UE to monitor when the UE is maintaining connectivity with both a source cell and a target cell during a handover procedure;

deciding, when an overlap of monitoring occasions in different CORESETs associated with different beams is detected and the UE is not configured to support different beams simultaneously, which of the overlapping monitoring occasions to monitor based on a dropping rule; and

monitoring, during the handover procedure, for physical downlink control channel (PDCCH) transmissions in accordance with the decision.

20 . The method of claim 19 , further comprising receiving signaling configuring the UE with priority information to use when applying the dropping rule.

21 . The method of claim 20 , wherein the priority information assigns a priority to at least one:

a UE-specific search space (USS) relative to a common search space (CSS); or

the target cell relative to the source cell.

22 . The method of claim 20 , wherein the priority information assigns, within a same cell, a priority to at least one:

a USS over a CSS; or

a CSS over a USS.

23 . The method of claim 22 , wherein the priority information also prioritizes:

the target cell over the source cell; or

the source cell over the target cell.

24 . The method of claim 20 , wherein the priority information prioritizes:

the target cell over the source cell; or

the source cell over the target cell.

25 . The method of claim 19 , further comprising:

sending a request for a certain dropping rule that prioritizes at least one or a UE-specific search space (USS) relative to a common search space (CSS) or the target cell relative to the source cell;

receiving a response to the request including the dropping rule, wherein the monitoring comprises monitoring the overlapping monitoring occasions in accordance with the dropping rule indicated in the response.

26 . The method of claim 19 , further comprising utilizing a beam of a prioritized CORESET as a default beam in case that CORESET overlaps with another CORESET in a monitoring occasion.