Power saving operation for a wireless device
In response to a timer, for switching physical downlink control channel (PDCCH) monitoring from a first search space group (SSG) of a bandwidth part (BWP) to a second SSG of the BWP, expiring in a slot within a time duration for skipping PDCCH monitoring on the BWP, a wireless device starts to monitor PDCCH on the second SSG no earlier than an expiration of the time duration.
1 . A method, performed by a wireless device, the method comprising:
monitoring a physical downlink control channel (PDCCH) on a first search space group (SSG) of a bandwidth part (BWP) while a timer is running, wherein the timer is for switching PDCCH monitoring from the first SSG of the BWP to a second SSG of the BWP;
receiving an indication for PDCCH skipping for a time duration on the BWP; and
in response to the timer expiring in a slot within the time duration for skipping PDCCH monitoring on the BWP, starting, by the wireless device, to monitor PDCCH on the second SSG no earlier than an expiration of the time duration.
2 . The method of claim 1 , further comprising starting the timer for the first SSG, of SSGs, on the BWP, wherein the timer is started:
based on receiving a first downlink control information (DCI) via the first SSG; and
with a timer value associated with the first SSG.
3 . The method of claim 1 , further comprising receiving, based on monitoring the PDCCH on the first SSG and while the timer is running, a second downlink control information (DCI) indicating to skip the PDCCH monitoring on the BWP for the time duration.
4 . The method of claim 1 , wherein the timer for SSG switching expires in a first slot, and the time duration for skipping PDCCH monitoring ends in a second slot after the first slot, and wherein the starting to monitor the PDCCH on the second SSG no earlier than the expiration of the time duration comprises starting to monitor the PDCCH on the second SSG after the second slot.
5 . The method of claim 1 , further comprising receiving one or more radio resource control (RRC) messages comprising configuration parameters of the BWP, indicating:
a plurality of search spaces, of the BWP, comprising the first SSG and the second SSG;
a timer value for the timer for SSG switching to the second SSG; and
the time duration for skipping PDCCH monitoring on the BWP.
6 . The method of claim 5 , further comprising starting the timer, based on the timer value associated with the first SSG, in response to switching to the first SSG for PDCCH monitoring on the BWP.
7 . The method of claim 1 , wherein an index of the second SSG is zero.
8 . A method, performed by a base station, the method comprising:
transmitting, by the base station to a wireless device, a physical downlink control channel (PDCCH) on a first search space group (SSG) of a bandwidth part (BWP) while a timer is running, wherein the timer is for switching PDCCH monitoring from the first SSG of the BWP to a second SSG of the BWP;
transmitting, by the base station to the wireless device, an indication for PDCCH skipping for a time duration on the BWP; and
in response to the timer expiring in a slot within the time duration for skipping PDCCH monitoring on the BWP, transmitting, by the base station to the wireless device, the PDCCH on the second SSG no earlier than an expiration of the time duration.
9 . The method of claim 8 , further comprising starting the timer for the first SSG, of SSGs, on the BWP, wherein the timer is started based on transmitting a first downlink control information (DCI) via the first SSG and with a timer value associated with the first SSG.
10 . The method of claim 8 , further comprising transmitting, to the wireless device, while the timer is running, a second downlink control information (DCI) indicating to skip the PDCCH monitoring on the BWP for the time duration.
11 . The method of claim 8 , wherein the timer for SSG switching expires in a first slot, and the time duration for skipping PDCCH monitoring ends in a second slot after the first slot, and wherein the transmitting the PDCCH on the second SSG no earlier than the expiration of the time duration comprises starting to transmit the PDCCH on the second SSG after the second slot.
12 . The method of claim 8 , further comprising transmitting, to the wireless device, one or more radio resource control (RRC) messages comprising configuration parameters of the BWP, indicating:
a plurality of search spaces, of the BWP, comprising the first SSG and the second SSG;
a timer value for the timer for SSG switching to the second SSG; and
the time duration for skipping PDCCH monitoring on the BWP.
13 . The method of claim 12 , further comprising starting the timer, based on the timer value associated with the first SSG, in response to switching to the first SSG for PDCCH monitoring on the BWP.
14 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a base station, cause the base station to:
transmit, by the base station to a wireless device, a physical downlink control channel (PDCCH) on a first search space group (SSG) of a bandwidth part (BWP) while a timer is running, wherein the timer is for switching PDCCH monitoring from the first SSG of the BWP to a second SSG of the BWP;
transmit, by the base station to the wireless device, an indication for PDCCH skipping for a time duration on the BWP; and
in response to the timer expiring in a slot within the time duration for skipping PDCCH monitoring on the BWP, transmit, by the base station to the wireless device, the PDCCH on the second SSG no earlier than an expiration of the time duration.
15 . The non-transitory computer-readable medium of claim 14 , wherein the instructions further cause the base station to start the timer for the first SSG, of SSGs, on the BWP, wherein the timer is started based on transmitting a first downlink control information (DCI) via the first SSG and with a timer value associated with the first SSG.
16 . The non-transitory computer-readable medium of claim 14 , wherein the instructions further cause the base station to transmit, to the wireless device, while the timer is running, a second downlink control information (DCI) indicating to skip the PDCCH monitoring on the BWP for the time duration.
17 . The non-transitory computer-readable medium of claim 14 , wherein the timer for SSG switching expires in a first slot, and the time duration for skipping PDCCH monitoring ends in a second slot after the first slot, and wherein the transmitting the PDCCH on the second SSG no earlier than the expiration of the time duration comprises starting to transmit the PDCCH on the second SSG after the second slot.
18 . The non-transitory computer-readable medium of claim 14 , wherein the instructions further cause the base station to transmit, to the wireless device, one or more radio resource control (RRC) messages comprising configuration parameters of the BWP, indicating:
a plurality of search spaces, of the BWP, comprising the first SSG and the second SSG;
a timer value for the timer for SSG switching to the second SSG; and
the time duration for skipping PDCCH monitoring on the BWP.
19 . The non-transitory computer-readable medium of claim 18 , wherein the instructions further cause the base station to start the timer, based on the timer value associated with the first SSG, in response to switching to the first SSG for PDCCH monitoring on the BWP.
20 . The non-transitory computer-readable medium of claim 14 , wherein an index of the second SSG is zero.