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;
activating at least two bandwidth parts (BWPs) for the first cell;
determining a first BWP, of the at least two BWPs, to monitor for cross-carrier scheduling of the second cell;
monitoring, on the first BWP during a time period in which the at least two BWPs are both active, a downlink control channel 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 , wherein the determining the first BWP is based on BWP indexes of the at least two BWPs.
3. The method of claim 1 , wherein:
the first BWP is a primary BWP;
a second BWP of the at least two BWPs is a secondary BWP; and
the 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, on the third BWP during a time period in which the third BWP and a second BWP of the at least two BWPs are both active, a downlink control channel 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 , 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 method comprising:
activating, by a wireless device, a first bandwidth part (BWP) of a first cell as a primary BWP;
activating a second BWP of the first cell as a secondary BWP;
monitoring, on the primary BWP, a downlink control channel for cross-carrier scheduling of a second cell;
receiving, during the monitoring, downlink control information (DCI) that indicates radio resources of the second cell; and
based on the DCI, performing one or more of the following:
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.
10. The method of claim 9 , further comprising:
receiving configuration parameters that indicate cross-carrier scheduling of the second cell via the first cell.
11. The method of claim 9 , further comprising receiving configuration parameters that 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.
12. The method of claim 9 , further comprising:
switching from the first BWP to a third BWP of the first cell as an active BWP;
based on the switching:
monitoring, on the third BWP during a time period in which the second BWP and the third BWP are both active, a downlink control channel for cross-carrier scheduling of the second cell; and
receiving, via the third BWP during the monitoring, second DCI that indicates radio resources for the second cell.
13. The method of claim 9 , further comprising:
selecting the first BWP, from at least two BWPs comprising the first BWP and the second BWP, as the primary BWP for the monitoring the downlink control channel for cross-carrier scheduling of the second cell.
14. The method of claim 13 , wherein the selecting the first BWP as the primary BWP is based on at least one of:
BWP indexes of the at least two BWPs; or
the first BWP being the primary BWP.
15. The method of claim 9 , wherein:
the activating the first BWP comprises activating the first BWP during a first time interval; and
the activating the second BWP comprises activating the second BWP during a second time interval that at least partially overlaps with the first time interval.
16. A method comprising:
activating a first BWP of a first cell as a first active BWP;
activating a second BWP of the first cell as a second active BWP;
receiving, via the first BWP, first downlink control information (DCI) for cross-carrier scheduling of a second cell;
switching from the first BWP to a third BWP of the first cell as the first active BWP;
based on the switching:
monitoring, on the third BWP during a time period in which the second BWP and the third BWP are both active, a downlink control channel for cross-carrier scheduling of the second cell; and
receiving, via the third BWP during the monitoring, second DCI that indicates radio resources for the second cell.
17. The method of claim 16 , further comprising:
receiving configuration parameters that indicate cross-carrier scheduling of the second cell via the first cell.
18. The method of claim 16 , further comprising receiving configuration parameters that 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.
19. The method of claim 16 , further comprising:
selecting the third BWP, from at least two BWPs comprising the third BWP and the second BWP, as an active BWP for the monitoring the downlink control channel for cross-carrier scheduling of the second cell, wherein the selecting the third BWP is based on at least one of:
BWP indexes of the at least two BWPs; or
the third BWP being a primary BWP.
20. The method of claim 16 , wherein:
the activating the first BWP comprises activating the first BWP during a first time interval; and
the activating the second BWP comprises activating the second BWP during a second time interval that at least partially overlaps with the first time interval.