Methods and apparatuses for power saving operations
A method for a User Equipment (UE) for performing a dormant operation is provided. The method receives, from a Base Station (BS), a Radio Resource Control (RRC) configuration indicating a set of one or more dormancy cell groups, where a group of serving cells belongs to a specific dormancy cell group in the set of one or more dormancy cell groups. The method receives, from the BS, a signal including a bitmap when the UE is not in a Discontinuous Reception (DRX) active time, and switches, 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.
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.