Power Saving for Downlink Control Channel Monitoring of Secondary Cells
A wireless device receives a medium access control control element (MAC CE) indicating activation of one or more secondary cells (SCells) of a plurality of SCells. A first downlink control channel of a first SCell of the one or more SCells is monitored. A downlink control information including a bitmap for power saving indication is received. Each bit of the bitmap corresponds to an SCell, of the plurality of SCells, in an ascending order of SCell indexes. A value of each bit indicates whether to monitor a downlink control channel on the corresponding SCell. Monitoring of the first downlink control channel is stopped, with the first SCell maintained as activated, in response to a bit, of the bitmap, corresponding to the first SCell and indicating not to monitor the first downlink control channel.
1 . A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive a medium access control control element (MAC CE) indicating activation of one or more secondary cells (SCells) of a plurality of SCells;
monitor a first downlink control channel of a first SCell of the one or more SCells;
receive a downlink control information (DCI) comprising a bitmap for power saving indication, wherein:
each bit of the bitmap corresponds to an SCell, of the plurality of SCells, in an ascending order of SCell indexes; and
a value of each bit indicates whether to monitor a downlink control channel on the corresponding SCell; and
stop monitoring the first downlink control channel, with the first SCell maintained as activated, in response to a bit, of the bitmap, corresponding to the first SCell and indicating not to monitor the first downlink control channel.
2 . The wireless device of claim 1 , wherein to monitor the first downlink control channel, the instructions further cause the wireless device to monitor the first downlink control channel on a first downlink bandwidth part of the first SCell.
3 . The wireless device of claim 1 , wherein the bit indicates whether to monitor the downlink control channel of a downlink bandwidth part of the corresponding SCell.
4 . The wireless device of claim 1 , wherein the monitoring of the first downlink control channel is stopped on a downlink bandwidth part of the first SCell.
5 . The wireless device of claim 1 , wherein the instructions further cause the wireless device to activate a bandwidth part of each of the one or more SCells before the receiving the first DCI.
6 . The wireless device of claim 1 , wherein the plurality of SCells comprise a plurality of deactivated SCells.
7 . The wireless device of claim 1 , wherein the first downlink control channel is monitored discontinuously in response to a discontinuous reception operation being configured on the first SCell.
8 . The wireless device of claim 1 , wherein the first SCell maintained as activated comprises performing channel state information measurement on a first downlink bandwidth part of the first SCell.
9 . The wireless device of claim 1 , wherein the first SCell maintained as activated comprises keeping running a SCell deactivation timer associated with the first SCell.
10 . The wireless device of claim 1 , wherein the first DCI is received via a primary cell.
11 . A base station comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the base station to:
transmit, to a wireless device, a medium access control control element (MAC CE) indicating activation of one or more secondary cells (SCells) of a plurality of SCells;
transmitting, to the wireless device, a first downlink control channel of a first SCell of the one or more activated SCells;
transmit, to the wireless device, a downlink control information (DCI) comprising a bitmap for power saving indication, wherein:
each bit of the bitmap corresponds to an SCell, of the plurality of SCells, in an ascending order of SCell indexes; and
a value of each bit indicates whether the wireless device monitors a downlink control channel on the corresponding SCell; and
stop transmitting, to the wireless device, the first downlink control channel of the first SCell, with the first SCell maintained as activated, for the wireless device in response to a bit, of the bitmap, corresponding to the first SCell and indicating not to monitor the first downlink control channel.
12 . The base station of claim 11 , wherein to transmit the first downlink control channel, the instructions further cause the base station to transmit the first downlink control channel on a first downlink bandwidth part of the first SCell.
13 . The base station of claim 11 , wherein the bit indicates whether the wireless device monitors the downlink control channel of a downlink bandwidth part of the corresponding SCell.
14 . The base station of claim 11 , wherein the transmission of the first downlink control channel is stopped on a downlink bandwidth part of the first SCell.
15 . The base station of claim 11 , wherein the instructions further cause the base station to activate, for the wireless device, a bandwidth part of each of the one or more SCells before the transmitting the first DCI.
16 . The base station of claim 11 , wherein the plurality of SCells comprise a plurality of deactivated SCells.
17 . The base station of claim 11 , wherein the first downlink control channel is transmitted discontinuously in response to a discontinuous reception operation being configured on the first SCell.
18 . The base station of claim 11 , wherein the first SCell maintained as activated comprises receiving channel state information measurement on a first downlink bandwidth part of the first SCell.
19 . The base station of claim 11 , wherein the first SCell maintained as activated comprises keeping running, for the wireless device, a SCell deactivation timer associated with the first SCell.
20 . A system comprising:
a base station comprising one or more first processors and first memory storing first instructions that, when executed by the one or more first processors, cause the base station to:
transmit a medium access control control element (MAC CE) indicating activation of one or more secondary cells (SCells) of a plurality of SCells; and
transmit a downlink control information (DCI) comprising a bitmap for power saving indication, wherein:
each bit of the bitmap corresponds to an SCell, of the plurality of SCells, in an ascending order of SCell indexes; and
a value of each bit indicates whether to monitor a downlink control channel on the corresponding SCell; and
a wireless device comprising one or more second processors and second memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to:
receive the MAC CE indicating the activation of the one or more SCells;
monitor a first downlink control channel of a first SCell of the one or more SCells;
receive the DCI comprising the bitmap for power saving indication; and
stop monitoring the first downlink control channel, with the first SCell maintained as activated, in response to a bit, of the bitmap, corresponding to the first SCell and indicating not to monitor the first downlink control channel.