Application delay of downlink control channel skipping
A wireless device monitors a physical downlink control channel (PDCCH) on a first search space group (SSG), of a bandwidth part (BWP), having one or more search spaces on the BWP. A downlink control information (DCI), received at a first slot, indicates to switch PDCCH monitoring from the first SSG to a second SSG, of the BWP, having no search spaces. The wireless device stops monitoring the PDCCH at a second slot that starts, after the last symbol of the first slot, in response to the switching PDDCH monitoring to the second SSG.
1. A method comprising:
monitoring, by a wireless device, a physical downlink control channel (PDCCH) on a first search space group (SSG), of a bandwidth part (BWP), the first SSG comprising one or more search spaces on the BWP;
receiving, at a first slot, a downlink control information (DCI) indicating to switch PDCCH monitoring from the first SSG to a second SSG of the BWP, wherein the DCI indicates that the second SSG of the BWP does not comprise any search spaces on the BWP; and
in response to switching PDCCH monitoring from the first SSG to the second SSG of the BWP and based on determining that the second SSG of the BWP does not comprise any search spaces, stopping monitoring the PDCCH on the first SSG and skipping monitoring the second SSG of the BWP at a second slot by applying a skipping delay without applying a switching delay, the skipping delay being shorter than the switching delay, wherein the second slot starts after a last symbol of the first slot, and wherein the second slot is determined based on a hybrid automatic repeat request (HARQ) feedback indication.
2. The method of claim 1 , further comprising maintaining the BWP in active state during the stopping monitoring of the PDCCH on the BWP.
3. The method of claim 1 , further comprising receiving one or more radio resource control (RRC) messages comprising configuration parameters of a cell, wherein the cell comprises a plurality of BWPs comprising the BWP.
4. The method of claim 3 , wherein the configuration parameters indicate a plurality of search spaces on the BWP of the cell, wherein the plurality of search spaces are grouped into SSGs.
5. The method of claim 4 , wherein the SSGs comprise:
the first SSG; and
the second SSG.
6. The method of claim 1 , wherein the DCI is received with a DCI format comprising a PDCCH monitoring adaptation field, and wherein the PDCCH monitoring adaptation field is set to a first value indicating the switching from the first SSG to the second SSG.
7. The method of claim 1 , further comprising:
receiving, at a third slot, a second DCI indicating switching PDCCH monitoring from the second SSG to a third SSG; and
starting, in response to the third SSG comprising at least one search space, PDCCH monitoring on the third SSG at a fourth slot starting at a number of slots after the third slot, wherein the number is based on the switching delay of SSG switching.
8. The method of claim 7 , wherein the delay of SSG switching is determined based on at least one of:
a wireless device processing capability; and
a numerology of the BWP.
9. The method of claim 1 , further comprising starting a SSG switching timer for the first SSG of the BWP.
10. The method of claim 9 , further comprising stopping the SSG switching timer in response to the DCI indicating to switch PDCCH monitoring from the first SSG to the second SSG not comprising any search spaces.
11. 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:
monitor a physical downlink control channel (PDCCH) on a first search space group (SSG), of a bandwidth part (BWP), the first SSG comprising one or more search spaces on the BWP;
receive, at a first slot, a downlink control information (DCI) indicating to switch PDCCH monitoring from the first SSG to a second SSG of the BWP, wherein the DCI indicates that the second SSG of the BWP does not comprise any search spaces on the BWP; and
in response to switching PDCCH monitoring from the first SSG to the second SSG of the BWP and based on determining that the second SSG of the BWP does not comprise any search spaces, stop monitoring the PDCCH on the first SSG and skip monitoring the second SSG of the BWP at a second slot by applying a skipping delay without applying a switching delay, the skipping delay being shorter than the switching delay, wherein the second slot starts after a last symbol of the first slot, and wherein the second slot is determined based on a hybrid automatic repeat request (HARQ) feedback indication.
12. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to maintain the BWP in active state during the stopping monitoring of the PDCCH on the BWP.
13. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive one or more radio resource control (RRC) messages comprising configuration parameters of a cell, wherein the cell comprises a plurality of BWPs comprising the BWP.
14. The wireless device of claim 13 , wherein the configuration parameters indicate a plurality of search spaces on the BWP of the cell, wherein the plurality of search spaces are grouped into SSGs.
15. The wireless device of claim 14 , wherein the SSGs comprise:
the first SSG; and
the second SSG.
16. The wireless device of claim 11 , wherein the DCI is received with a DCI format comprising a PDCCH monitoring adaptation field, and wherein the PDCCH monitoring adaptation field is set to a first value indicating the switching from the first SSG to the second SSG.
17. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
receive, at a third slot, a second DCI indicating switching PDCCH monitoring from the second SSG to a third SSG; and
start, in response to the third SSG comprising at least one search space, PDCCH monitoring on the third SSG at a fourth slot starting at a number of slots after the third slot, wherein the number is based on the switching delay of SSG switching.
18. The wireless device of claim 17 , wherein the switching delay of SSG switching is determined based on at least one of:
a wireless device processing capability; and
a numerology of the BWP.
19. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
start a SSG switching timer for the first SSG of the BWP; and
stop the SSG switching timer in response to the DCI indicating to switch PDCCH monitoring from the first SSG to the second SSG not comprising any search spaces.
20. A non-transitory computer-readable medium storing instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
monitor a physical downlink control channel (PDCCH) on a first search space group (SSG), of a bandwidth part (BWP), the first SSG comprising one or more search spaces on the BWP;
receive, at a first slot, a downlink control information (DCI) indicating to switch PDCCH monitoring from the first SSG to a second SSG of the BWP, the second SSG of the BWP not comprising any search spaces on the BWP; and
in response to switching PDCCH monitoring from the first SSG to the second SSG of the BWP and based on determining that the second SSG of the BWP does not comprise any search spaces, stop monitoring the PDCCH on the first SSG and skip monitoring the second SSG of the BWP at a second slot by applying a skipping delay without applying a switching delay, the skipping delay being shorter than the switching delay, wherein the second slot starts after a last symbol of the first slot, and wherein the second slot is determined based on a hybrid automatic repeat request (HARQ) feedback indication.