Apparatus and method for transmission configuration indication states

1 . A base station for wireless communication, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the base station to:

receive a capability report from a remote device, wherein the capability report indicates that the remote device supports 128 or more configurable transmission configuration indication (TCI) states;

configure a set of 128 or more TCI states according to the capability report; and

transmit a media access control control element (MAC-CE) to activate a subset of the set of TCI states,

wherein a quantity of TCI states in the subset activated by the MAC-CE is greater than eight,

wherein the TCI states in the subset are associated with a control resource set (CORESET) group of a plurality of CORESET groups,

wherein the MAC-CE comprises the following fields:

a CORESET group identification field, and

a serving cell identification field, and

a bandwidth part identification field, and

one or more TCI state fields, wherein each TCI state field indicates a TCI state to be activated,

wherein a first set of TCI state field values are associated with a first CORESET group of the plurality of CORESET groups and a second set of TCI state field values are associated with a second CORESET group of the plurality of CORESET groups, and

wherein CORESETs belonging to a same CORESET group are configured with a same index value.

2 . The base station of claim 1 , wherein the TCI states in the subset are associated with the plurality of CORESET groups including the CORESET group, and each CORESET group of the plurality of CORESET groups comprises one or more CORESETs that are configured for a same transmit receive point.

3 . The base station of claim 2 , wherein the CORESET group identification field comprises a CORESET identification.

4 . The base station of claim 3 , wherein the CORESET identification is a lowest CORESET identification among the plurality of CORESETs configured for the same transmit receive point.

5 . The base station of claim 2 , wherein the at least one processor is further configured to cause the base station to configure a plurality of TCI groups, and each TCI group comprises a plurality of configured TCI states that are associated with one of the CORESET groups of the plurality of CORESET groups.

6 . The base station of claim 1 , wherein the TCI states in the subset are associated with a plurality of CORESETs configured with a same index value.

7 . The base station of claim 6 , wherein the MAC-CE comprises an index value.

8 . The base station of claim 1 , wherein the MAC-CE comprises eight TCI state identifiers, each TCI state identifier indicating a TCI state to be activated.

9 . A user equipment (UE) for wireless communication, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the UE to:

transmit a capability report, wherein the capability report indicates that the UE supports a set of 128 or more configurable transmission configuration indication (TCI) states; and

receive a media access control control element (MAC-CE) for activating a subset of the set of TCI states,

wherein a quantity of TCI states in the subset activated by the MAC-CE is greater than eight,

wherein the TCI states in the subset are associated with a control resource set (CORESET) group of a plurality of CORESET groups,

wherein the MAC-CE comprises the following fields:

a CORESET group identification field, and

a serving cell identification field, and

a bandwidth part identification field, and

one or more TCI state fields, wherein each TCI state field indicates a TCI state to be activated,

wherein a first set of TCI state field values are associated with a first CORESET group of the plurality of CORESET groups and a second set of TCI state field values are associated with a second CORESET group of the plurality of CORESET groups, and

wherein CORESETs belonging to a same CORESET group are configured with a same index value.

10 . The UE of claim 9 , wherein the CORESET group identification field comprises a CORESET identification.

11 . The UE of claim 10 , wherein the CORESET group comprises one or more CORESETs that are associated with a same transmit receive point.

12 . The UE of claim 9 , wherein the TCI states in the subset are associated with a plurality of CORESETs configured with a same index value.

13 . The UE of claim 12 , wherein the MAC-CE comprises an index value.

14 . The UE of claim 9 , wherein the at least one processor is further configured to cause the UE to determine a quasi co-location for a physical downlink shared channel reception based on a TCI state configured for a CORESET with a lowest CORESET identifier among the CORESETs configured for a same transmit receive point when a higher layer parameter tci-PresentInDCI is set to enabled and an offset between reception of a downlink control information and a corresponding physical downlink shared channel is less than a threshold.

15 . A method performed by a base station, the method comprising:

receiving a capability report from a remote device, wherein the capability report indicates that the remote device supports 128 or more configurable transmission configuration indication (TCI) states;

configuring a set of 128 or more TCI states according to the capability report; and

transmitting a media access control control element (MAC-CE) to activate a subset of the set of TCI states,

wherein the TCI states in the subset are associated with a control resource set (CORESET) group of a plurality of CORESET groups,

wherein the MAC-CE comprises the following fields:

a CORESET group identification field, and

a serving cell identification field, and

a bandwidth part identification field, and

one or more TCI state fields, wherein each TCI state field indicates a TCI state to be activated,

wherein a first set of TCI state field values are associated with a first CORESET group of the plurality of CORESET groups and a second set of TCI state field values are associated with a second CORESET group of the plurality of CORESET groups, and

wherein CORESETs belonging to a same CORESET group are configured with a same index value.

16 . The method of claim 15 , wherein the TCI states in the subset are associated with the plurality of CORESET groups including the CORESET group, and each CORESET group of the plurality of CORESET groups comprises one or more CORESETs that are configured for a same transmit receive point.