Methods and apparatuses for power saving operations
A method for a UE for performing a dormant operation is provided. The method includes receiving, from a BS, an 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, each bit of the bitmap being associated with a respective dormancy cell group in the set of one or more dormancy cell groups; and switching, based on a bit in the bitmap that is associated with the specific dormancy cell group, active BWPs of all serving cells included in the group of serving cells to a dormant BWP or to a non-dormant BWP.
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, each bit of the bitmap being associated with a respective dormancy cell group in the set of one or more dormancy cell groups; and
switching, based on a bit in the bitmap that is associated with the specific dormancy cell group, active Bandwidth Parts (BWPs) of all 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 the signal is received 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 Discontinuous Reception (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 Discontinuous Reception (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 a Discontinuous Reception (DRX) active time, wherein the PDCCH monitoring occasion is configured for the signal; and
monitoring the signal on the PDCCH monitoring occasion when the UE is not in the DRX active time.
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, each bit of the bitmap being associated with a respective dormancy cell group in the set of one or more dormancy cell groups; and
switch, based on a bit in the bitmap that is associated with the specific dormancy cell group, active Bandwidth Parts (BWPs) of all 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 the signal is received 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 Discontinuous Reception (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 Discontinuous Reception (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 a Discontinuous Reception (DRX) active time, wherein the PDCCH monitoring occasion is configured for the signal; and
monitor the signal on the PDCCH monitoring occasion when the UE is not in the DRX active time.
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.