Multiple active bandwidth parts
Bandwidth parts (BWPs) and other resources for wireless communications are described. A wireless device may use a BWP control procedure and/or a BWP timer management procedure for activating, deactivating, and/or switching BWPs, for example, using multiple active BWPs. A base station may send information comprising one or more fields indicating an action associated with a BWP, for example, if multiple active BWPs are supported. A wireless device may control a first BWP inactivity timer associated with a first active BWP, for example, based on activating, deactivating, and/or switching a second BWP.
1. A method comprising:
activating, by a wireless device, a primary bandwidth part (BWP) of a cell and a secondary BWP of the cell;
receiving, via the primary BWP, a downlink signal in a first slot;
switching, based on a period of inactivity of the primary BWP after the first slot and based on a determination that the primary BWP is active, from the primary BWP to a default BWP of the cell as an active BWP of the cell; and
deactivating, based on the switching from the primary BWP to the default BWP and based on a determination that the secondary BWP is active, the secondary BWP.
2. The method of claim 1 , further comprising:
monitoring a downlink control channel on the primary BWP for downlink control information (DCI), wherein the switching from the primary BWP to the default BWP is further based on a determination that the DCI is not received during the monitoring.
3. The method of claim 1 , further comprising:
switching from the default BWP to a third BWP of the cell as the active BWP;
starting, based on receiving a second downlink signal via the third BWP, a BWP inactivity timer;
receiving, via the third BWP, a third downlink signal indicating at least one of:
activating a fourth BWP of the cell;
deactivating the fourth BWP of the cell;
switching from the fourth BWP to a fifth BWP as a second secondary BWP; or
allocating radio resources for the fourth BWP; and
restarting, based on the third downlink signal, the BWP inactivity timer.
4. The method of claim 3 , wherein the third BWP and the primary BWP are a same active BWP of the cell.
5. The method of claim 1 , wherein the period of inactivity comprises a duration of time that a BWP inactivity timer is running.
6. The method of claim 1 , wherein the default BWP is different from the primary BWP and the secondary BWP.
7. The method of claim 1 , wherein the cell comprises a primary cell or a secondary cell.
8. The method of claim 1 , wherein the switching from the primary BWP to the default BWP comprises:
deactivating the primary BWP; and
activating the default BWP as the active BWP.
9. The method of claim 1 , wherein the activating the primary BWP and the secondary BWP comprises:
activating the primary BWP during a first time interval; and
activating the secondary BWP during a second time interval.
10. The method of claim 1 , further comprising:
receiving one or more radio resource control (RRC) messages comprising at least one of:
a first parameter indicating the primary BWP; and
a second parameter indicating the secondary BWP.
11. The method of claim 1 , wherein:
the primary BWP comprises a common search space; and
the secondary BWP comprises a user device-specific search space.
12. A method comprising:
activating, by a wireless device, a primary bandwidth part (BWP) of a cell and a secondary BWP of the cell;
receiving, via the primary BWP, a downlink signal in a first slot;
monitoring a downlink control channel on the primary BWP for downlink control information (DCI);
based on determining that the DCI is not received during a period of inactivity of the primary BWP after the first slot and based on a determination that the primary BWP is, switching from the primary BWP to a default BWP of the cell as an active BWP of the cell;
deactivating, based on the switching, the primary MVP; and
deactivating, based on the deactivating the primary BWP, the secondary BWP.
13. The method of claim 12 , wherein the period of inactivity of the primary BWP is associated with a duration of time that a BWP inactivity timer is running.
14. The method of claim 12 , further comprising:
switching from the default BWP to a third BWP of the cell as the active BWP;
starting, based on receiving a second downlink signal via the third BWP, a BWP inactivity timer;
receiving, via the third BWP, a third downlink signal indicating at least one of:
activating a fourth BWP of the cell;
deactivating the fourth BWP of the cell;
switching from the fourth BWP to a fifth BWP as a second secondary BWP; or
allocating radio resources for the fourth BWP; and
restarting, based on the third downlink signal, the BWP inactivity timer.
15. The method of claim 14 , wherein the third BWP and the primary BWP are a same active BWP of the cell.
16. The method of claim 12 , wherein the default BWP is different from the primary BWP and the secondary BWP.
17. The method of claim 12 , wherein the cell comprises a primary cell or a secondary cell.
18. The method of claim 12 , wherein the switching from the primary BWP to the default BWP comprises
activating the default BWP as the active BWP.
19. The method of claim 12 , further comprising:
receiving one or more radio resource control (RRC) messages comprising at least one of:
a first parameter indicating the primary BWP; and
a second parameter indicating the secondary BWP.
20. The method of claim 12 , wherein:
the primary BWP comprises a common search space; and
the secondary BWP comprises a user device-specific search space.
21. A method comprising:
activating, by a wireless device, a primary bandwidth part (BWP) of a cell;
starting, based on receiving a first downlink signal via the primary BWP, a BWP inactivity timer;
receiving, via the primary BWP, a second downlink signal indicating at least one of:
activating a first secondary BWP of the cell;
deactivating the first secondary BWP of the cell;
switching from the first secondary BWP to a second secondary BWP; or
allocating radio resources for the first secondary BWP;
restarting, based on the second downlink signal, the BWP inactivity timer; and
based on a determination that downlink control information (DCI) has not been received before an expiration of the BWP inactivity timer and based on a determination that the primary BWP is active;
switching from the primary BWP to a default BWP; and
deactivating the first secondary BWP.
22. The method of claim 21 , further comprising:
monitoring, during a time period that the BWP inactivity timer is running, a downlink control channel on the primary BWP for the DCI.
23. The method of claim 21 , further comprising:
activating, based on the second downlink signal, the secondary BWP of the cell; and
deactivating, based on a determination that at least one downlink transport block has not been received before an expiration of a second BWP inactivity timer and based on a determination that the secondary BWP is active, the secondary BWP.
24. The method of claim 21 , further comprising:
receiving, via the primary BWP during a time period that the BWP inactivity timer is running, at least one downlink transport block; and
restarting, based on the at least one downlink transport block, the BWP inactivity timer.
25. The method of claim 21 , further comprising:
receiving one or more radio resource control (RRC) messages comprising at least one of:
a first parameter indicating the primary BWP; and
a second parameter indicating the secondary BWP.
26. The method of claim 21 , wherein:
the primary BWP comprises a common search space; and
the secondary BWP comprises a user device-specific search space.