Cross carrier scheduling with multiple active bandwidth parts
Wireless communications using multiple active resources (e.g., bandwidth parts (BWP)) are described. At least one of multiple active resources (e.g., BWPs) of a first cell may be selected to send scheduling information (e.g., cross-carrier scheduling information) for other cells. A base station may send downlink control information (DCI) for scheduling (e.g., cross-carrier scheduling) a second cell using the selected BWP. A wireless device may monitor a physical downlink control channel (PDCCH) of the selected BWP to detect the DCI for scheduling (e.g., cross-carrier scheduling) the second cell.
1. A method comprising:
receiving, by a wireless device, configuration parameters that indicate cross-carrier scheduling of a second cell via a first cell;
monitoring a downlink control channel of a first bandwidth part (BWP), of at least two active BWPs associated with the first cell, for cross-carrier scheduling of the second cell; and
receiving, via the first BWP during the monitoring, downlink control information (DCI) that indicates radio resources for the second cell.
2. The method of claim 1 , further comprising:
determining the first BWP based on BWP indexes of the at least two active BWPs.
3. The method of claim 1 , wherein:
the first BWP is a primary BWP;
a second BWP of the at least two active BWPs is a secondary BWP; and
determining the first BWP is based on the first BWP being the primary BWP.
4. The method of claim 1 , further comprising at least one of:
receiving, via downlink radio resources of the radio resources for the second cell, a downlink transport block; or
sending, via uplink radio resources of the radio resources for the second cell, an uplink transport block.
5. The method of claim 1 , further comprising:
switching from the first BWP to a third BWP of the first cell as an active BWP;
based on the switching:
monitoring a downlink control channel of the third BWP, during a time period in which the third BWP and a second BWP are both active, for cross-carrier scheduling of the second cell; and
receiving, via the third BWP during the monitoring, second DCI that indicates second radio resources for the second cell.
6. The method of claim 1 , wherein the configuration parameters further indicate at least one of:
a control resource set of the first BWP;
a search space set of the first BWP;
a subcarrier space of the first BWP;
a quantity of symbols of the first BWP; or
a set of resource blocks of the first BWP.
7. The method of claim 1 , further comprising:
activating at least two BWPs for the first cell, wherein the activating the at least two BWPs for the first cell comprises:
activating the first BWP during a first time interval; and
activating a second BWP of the at least two BWPs during a second time interval, wherein the second time interval at least partially overlaps with the first time interval.
8. The method of claim 1 , wherein the DCI comprises:
a cell index indicating the second cell; and
a BWP indicator indicating at least one of:
an uplink active BWP of the second cell; or
a downlink active BWP of the second cell.
9. 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 configuration parameters that indicate cross-carrier scheduling of a second cell via a first cell;
monitor a downlink control channel of a first bandwidth part (BWP), of at least two active BWPs associated with the first cell, for cross-carrier scheduling of the second cell; and
receive, via the first BWP during the monitoring, downlink control information (DCI) that indicates radio resources for the second cell.
10. The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
determine the first BWP based on BWP indexes of the at least two active BWPs.
11. The wireless device of claim 9 , wherein:
the first BWP is a primary BWP;
a second BWP of the at least two active BWPs is a secondary BWP; and
determining the first BWP is based on the first BWP being the primary BWP.
12. The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
receive, via downlink radio resources of the radio resources for the second cell, a downlink transport block; or
send, via uplink radio resources of the radio resources for the second cell, an uplink transport block.
13. The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
switch from the first BWP to a third BWP of the first cell as an active BWP;
based on the switch:
monitor a downlink control channel of the third BWP, during a time period in which the third BWP and a second BWP are both active, for cross-carrier scheduling of the second cell; and
receive, via the third BWP during the monitoring, second DCI that indicates second radio resources for the second cell.
14. The wireless device of claim 9 , wherein the configuration parameters further indicate at least one of:
a control resource set of the first BWP;
a search space set of the first BWP;
a subcarrier space of the first BWP;
a quantity of symbols of the first BWP; or
a set of resource blocks of the first BWP.
15. The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
activate at least two BWPs for the first cell, wherein activating the at least two BWPs for the first cell comprises:
activating the first BWP during a first time interval; and
activating a second BWP of the at least two BWPs during a second time interval, wherein the second time interval at least partially overlaps with the first time interval.
16. The wireless device of claim 9 , wherein the DCI comprises:
a cell index indicating the second cell; and
a BWP indicator indicating at least one of:
an uplink active BWP of the second cell; or
a downlink active BWP of the second cell.
17. A non-transitory computer-readable medium comprising instructions that, when executed, configure a wireless device to:
receive configuration parameters that indicate cross-carrier scheduling of a second cell via a first cell;
monitor a downlink control channel of a first bandwidth part (BWP), of at least two active BWPs associated with the first cell, for cross-carrier scheduling of the second cell; and
receive, via the first BWP during the monitoring, downlink control information (DCI) that indicates radio resources for the second cell.
18. The non-transitory computer-readable medium of claim 17 , wherein the instructions, when executed, configure the wireless device to:
determine the first BWP based on BWP indexes of the at least two active BWPs.
19. The non-transitory computer-readable medium of claim 17 , wherein:
the first BWP is a primary BWP;
a second BWP of the at least two active BWPs is a secondary BWP; and
determining the first BWP is based on the first BWP being the primary BWP.
20. The non-transitory computer-readable medium of claim 17 , wherein the instructions, when executed, configure the wireless device to:
receive, via downlink radio resources of the radio resources for the second cell, a downlink transport block; or
send, via uplink radio resources of the radio resources for the second cell, an uplink transport block.
21. The non-transitory computer-readable medium of claim 17 , wherein the instructions, when executed, configure the wireless device to:
switch from the first BWP to a third BWP of the first cell as an active BWP;
based on the switch:
monitor a downlink control channel of the third BWP, during a time period in which the third BWP and a second BWP are both active, for cross-carrier scheduling of the second cell; and
receive, via the third BWP during the monitoring, second DCI that indicates second radio resources for the second cell.
22. The non-transitory computer-readable medium of claim 17 , wherein the configuration parameters further indicate at least one of:
a control resource set of the first BWP;
a search space set of the first BWP;
a subcarrier space of the first BWP;
a quantity of symbols of the first BWP; or
a set of resource blocks of the first BWP.
23. The non-transitory computer-readable medium of claim 17 , wherein the instructions, when executed, configure the wireless device to:
activate at least two BWPs for the first cell, wherein activating the at least two BWPs for the first cell comprises:
activating the first BWP during a first time interval; and
activating a second BWP of the at least two BWPs during a second time interval, wherein the second time interval at least partially overlaps with the first time interval.
24. The non-transitory computer-readable medium of claim 17 , wherein the DCI comprises:
a cell index indicating the second cell; and
a BWP indicator indicating at least one of:
an uplink active BWP of the second cell; or
a downlink active BWP of the second cell.