METHOD AND APPARATUS FOR NETWORK ENERGY SAVING

1 . A method performed by a User Equipment (UE) for Network Energy Saving (NES), the method comprising:

receiving, from a Base Station (BS), a Radio Resource Control (RRC) message comprising a Transmission Configuration Indication (TCI) list;

storing the TCI list in the UE;

receiving, from the BS, a Downlink Control Information (DCI) format; and

updating the TCI list stored in the UE based on the DCI format.

2 . The method of claim 1 , wherein:

the TCI list comprises a first TCI state that includes a first Quasi Co-Location (QCL) field, and

the first QCL field indicates a first reference signal and a first QCL type.

3 . The method of claim 2 , wherein:

the first QCL field further indicates at least one spatial pattern associated with the first reference signal.

4 . The method of claim 3 , wherein:

the DCI format includes a first index associated with one of the at least one spatial pattern indicated by the first QCL field, and

updating the TCI list stored in the UE comprises selecting the one of the at least one spatial pattern to be applied on the first reference signal based on the first index.

5 . The method of claim 2 , wherein:

the first QCL field further indicates at least one candidate reference signal.

6 . The method of claim 5 , wherein:

the DCI format includes a first index associated with one of the at least one candidate reference signal indicated by the first QCL field, and

updating the TCI list stored in the UE comprises determining that the first QCL type is associated with the one of the at least one candidate reference signal based on the first index.

7 . The method of claim 2 , wherein:

the first TCI state further includes a second QCL field,

the second QCL field indicates a second reference signal and a second QCL type, and

the first QCL type is different from the second QCL type.

8 . The method of claim 2 , wherein:

the first reference signal comprises a Channel State Information-Reference Signal (CSI-RS).

9 . A User Equipment (UE) for Network Energy Saving (NES), the UE comprising:

at least one processor; and

at least one non-transitory computer-readable medium coupled to the at least one processor and storing one or more computer-executable instructions that, when executed by the at least one processor, cause the UE to:

receive, from a Base Station (BS), a Radio Resource Control (RRC) message comprising a Transmission Configuration Indication (TCI) list;

store the TCI list in the UE;

receive, from the BS, a Downlink Control Information (DCI) format; and

update the TCI list stored in the UE based on the DCI format.

10 . The UE of claim 9 , wherein:

the TCI list comprises a first TCI state that includes a first Quasi Co-Location (QCL) field, and

the first QCL field indicates a first reference signal and a first QCL type.

11 . The UE of claim 10 , wherein:

the first QCL field further indicates at least one spatial pattern associated with the first reference signal.

12 . The UE of claim 11 , wherein:

the DCI format includes a first index associated with one of the at least one spatial pattern indicated by the first QCL field, and

updating the TCI list stored in the UE comprises selecting the one of the at least one spatial pattern to be applied on the first reference signal based on the first index.

13 . The UE of claim 10 , wherein:

the first QCL field further indicates at least one candidate reference signal.

14 . The UE of claim 13 , wherein:

the DCI format includes a first index associated with one of the at least one candidate reference signal indicated by the first QCL field, and

updating the TCI list stored in the UE comprises determining that the first QCL type is associated with the one of the at least one candidate reference signal based on the first index.

15 . The UE of claim 10 , wherein:

the first TCI state further includes a second QCL field,

the second QCL field indicates a second reference signal and a second QCL type, and

the first QCL type is different from the second QCL type.

16 . The UE of claim 10 , wherein:

the first reference signal comprises a Channel State Information-Reference Signal (CSI-RS).

17 . A Base Station (BS) for Network Energy Saving (NES), the BS comprising:

at least one processor; and

at least one non-transitory computer-readable medium coupled to the at least one processor and storing one or more computer-executable instructions that, when executed by the at least one processor, cause the BS to:

transmit, to a User Equipment (UE), a Radio Resource Control (RRC) message comprising a Transmission Configuration Indication (TCI) list, the RRC message enabling the UE to store the TCI list in the UE; and

transmit, to the UE, a Downlink Control Information (DCI) format, the DCI format enabling the UE to update the TCI list stored in the UE.

18 . The BS of claim 17 , wherein:

the TCI list comprises a first TCI state that includes a first Quasi Co-Location (QCL) field, and

the first QCL field indicates a first reference signal and a first QCL type.

19 . The BS of claim 18 , wherein:

the first QCL field further indicates at least one spatial pattern associated with the first reference signal,

the DCI format includes a first index associated with one of the at least one spatial pattern indicated by the first QCL field, and

the UE updates the TCI list stored in the UE by selecting the one of the at least one spatial pattern to be applied on the first reference signal based on the first index.

20 . The BS of claim 18 , wherein:

the first QCL field further indicates at least one candidate reference signal,

the DCI format includes a first index associated with one of the at least one candidate reference signal indicated by the first QCL field, and

the UE updates the TCI list stored in the UE by determining that the first QCL type is associated with the one of the at least one candidate reference signal based on the first index.