Downlink Control Channel Monitoring Adaptation for Carrier Aggregation

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, one or more messages comprising:
• a parameter indicating that a first cell cross-carrier schedules a second cell;
• a first index of a first search space (SS), of the first cell, for self-carrier scheduling the first cell;
• and
• a second index of a second SS of the second cell, wherein the second SS is linked to the first SS for the cross-carrier scheduling based on the first index being same as the second index;
• transmit PDCCH candidates of SSs:
• for self-scheduling the first cell;
• and
• for cross-carrier scheduling the second cell;
• transmit, to the wireless device via the first cell, a downlink control information (DCI) comprising:
• a carrier indicator field (CIF) indicating self-scheduling the first cell or cross-carrier scheduling the second cell;
• and
• a PDCCH monitoring skipping indication;
• and
• in response to the PDCCH monitoring skipping indication, skip PDCCH transmission according to the SSs of the first cell, wherein the skipping PDCCH transmission comprises skipping:
• PDCCH transmission for self-scheduling the first cell;
• and
• PDCCH transmission for cross-carrier scheduling the second cell.

A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:

• receive one or more messages comprising:
• a parameter indicating that a first cell cross-carrier schedules a second cell;
• a first index of a first search space (SS), of the first cell, for self-carrier scheduling the first cell;
• and
• a second index of a second SS of the second cell, wherein the second SS is linked to the first SS for the cross-carrier scheduling based on the first index being same as the second index;
• monitor PDCCH candidates of SSs:
• for self-scheduling the first cell;
• and
• for cross-carrier scheduling the second cell;
• receive, via the first cell, a downlink control information (DCI) comprising:
• a carrier indicator field (CIF) indicating self-scheduling the first cell or cross-carrier scheduling the second cell;
• and
• a PDCCH monitoring skipping indication;
• and
• in response to the PDCCH monitoring skipping indication, skip PDCCH monitoring, according to the SSs of the first cell, wherein the skipping PDCCH monitoring comprises skipping:
• PDCCH monitoring for self-scheduling the first cell;
• and
• PDCCH monitoring for cross-carrier scheduling the second cell.