Methods and apparatuses for power saving operations

1 . A method for a User Equipment (UE) for performing a dormant operation, the method comprising:

receiving, from a Base Station (BS), a Radio Resource Control (RRC) configuration indicating a set of one or more dormancy cell groups, wherein a group of serving cells belongs to a specific dormancy cell group in the set of one or more dormancy cell groups;

receiving, from the BS, a signal including a bitmap when the UE is not in a Discontinuous Reception (DRX) active time; and

switching, based on a bit in the bitmap that is associated with the specific dormancy cell group, active Bandwidth Parts (BWPs) of all activated serving cells included in the group of serving cells to a dormant BWP or to a non-dormant BWP.

2 . The method of claim 1 , further comprising:

performing the dormant operation on a specific serving cell included in the group of serving cells in a case that the active BWP of the specific serving cell is the dormant BWP.

3 . The method of claim 1 , wherein the dormant operation includes:

performing a Channel State Information (CSI) measurement; and

forgoing monitoring a Physical Downlink Control Channel (PDCCH).

4 . The method of claim 1 , wherein the dormant operation includes at least one of:

performing Automatic Gain Control (AGC) for a specific serving cell included in the group of serving cells, or

performing beam management for the specific serving cell.

5 . The method of claim 1 , further comprising:

forgoing monitoring a Physical Downlink Control Channel (PDCCH) on a specific serving cell included in the group of serving cells in a case that the active BWP of the specific serving cell is the dormant BWP; and

monitoring the PDCCH on the specific serving cell in a case that the active BWP of the specific serving cell is the non-dormant BWP.

6 . The method of claim 1 , wherein receiving the signal comprises receiving the signal via Downlink Control Information (DCI) that is scrambled by a Power Saving-Radio Network Temporary Identifier (PS-RNTI).

7 . The method of claim 1 , wherein the signal further includes a wake-up indicator for starting a DRX On-duration timer (drx-onDurationTimer) at a beginning of a DRX cycle.

8 . The method of claim 1 , further comprising:

receiving a configuration of a DRX operation from the BS.

9 . The method of claim 1 , further comprising:

forgoing monitoring the signal on a Physical Downlink Control Channel (PDCCH) monitoring occasion when the UE is in the DRX active time, wherein the PDCCH monitoring occasion is configured for the signal.

10 . The method of claim 1 , wherein the active BWP of a specific serving cell included in the group of serving cells is a Downlink (DL) BWP.

11 . A User Equipment (UE) for performing a dormant operation, the UE comprising:

transmitting and receiving circuitry; and

at least one processor coupled to the transmitting and receiving circuitry and configured to:

receive, by the transmitting and receiving circuitry, a Radio Resource Control (RRC) configuration indicating a set of one or more dormancy cell groups from a Base Station (BS), wherein a group of serving cells belongs to a specific dormancy cell group in the set of one or more dormancy cell groups;

receive, by the transmitting and receiving circuitry, a signal including a bitmap from the BS when the UE is not in a Discontinuous Reception (DRX) active time; and

switch, based on a bit in the bitmap that is associated with the specific dormancy cell group, active Bandwidth Parts (BWPs) of all activated serving cells included in the group of serving cells to a dormant BWP or to a non-dormant BWP.

12 . The UE of claim 11 , wherein the at least one processor is further configured to:

perform the dormant operation on a specific serving cell included in the group of serving cells in a case that the active BWP of the specific serving cell is the dormant BWP.

13 . The UE of claim 11 , wherein the dormant operation includes:

performing a Channel State Information (CSI) measurement; and

forgoing monitoring a Physical Downlink Control Channel (PDCCH).

14 . The UE of claim 11 , wherein the dormant operation includes at least one of:

performing Automatic Gain Control (AGC) for a specific serving cell included in the group of serving cells, or

performing beam management for the specific serving cell.

15 . The UE of claim 11 , wherein the at least one processor is further configured to:

forgo monitoring a Physical Downlink Control Channel (PDCCH) on a specific serving cell included in the group of serving cells in a case that the active BWP of the specific serving cell is the dormant BWP; and

monitor the PDCCH on the specific serving cell in a case that the active BWP of the specific serving cell is the non-dormant BWP.

16 . The UE of claim 11 , wherein receiving the signal comprises receiving the signal via Downlink Control Information (DCI) that is scrambled by a Power Saving-Radio Network Temporary Identifier (PS-RNTI).

17 . The UE of claim 11 , wherein the signal further includes a wake-up indicator for starting a DRX On-duration timer (drx-onDurationTimer) at a beginning of a DRX cycle.

18 . The UE of claim 11 , wherein the at least one processor is further configured to:

receive, by the transmitting and receiving circuitry, a configuration of a DRX operation from the BS.

19 . The UE of claim 11 , wherein the at least one processor is further configured to:

forgo monitoring the signal on a Physical Downlink Control Channel (PDCCH) monitoring occasion when the UE is in the DRX active time, wherein the PDCCH monitoring occasion is configured for the signal.

20 . The UE of claim 11 , wherein the active BWP of a specific serving cell included in the group of serving cells is a Downlink (DL) BWP.