Secondary cell management in wireless communications
Secondary cell management in wireless communications is described. A cell group may comprise a plurality of secondary cells. The cell group may comprise a first cell with a control channel. The wireless device may keep the first cell active while at least one secondary cell in the cell group is active.
1. 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, from a base station:
configuration parameters of a cell group, wherein the cell group comprises:
a first cell configured with a control channel; and
at least one secondary cell different from the first cell; and
timing information associated with the at least one secondary cell of the cell group;
keep the first cell active while the at least one secondary cell is active; and
deactivate the first cell during or after deactivation of each other secondary cell of the cell group.
2. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to maintain configuration of physical uplink control channel (PUCCH) resources of the first cell after the first cell is deactivated.
3. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to restart a deactivation timer after a physical downlink control channel (PDCCH) on the first cell indicates an uplink grant or a downlink assignment.
4. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to restart a deactivation timer associated with the first cell after a physical downlink control channel (PDCCH) indicates an uplink grant for the first cell or a downlink assignment for the first cell.
5. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive, from the base station, configuration parameters of physical uplink control channel (PUCCH) resources of the first cell.
6. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive, from the base station, information that maps a plurality of secondary cells to the cell group.
7. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit, via the first cell, at least one of:
channel state information associated with the at least one secondary cell;
positive acknowledgement associated with the at least one secondary cell;
negative acknowledgement associated with the at least one secondary cell; or
a scheduling request associated with the at least one secondary cell.
8. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, cause the wireless device to keep the first cell active after a condition for deactivation of the first cell being satisfied.
9. The wireless device of claim 8 , wherein the condition for deactivation of the first cell comprises at least one of:
an expiration of a deactivation timer associated with the first cell;
a medium access control (MAC) control element indicating deactivation of the first cell; or
a radio resource control message.
10. A method comprising:
receiving, by a wireless device:
configuration parameters of a cell group, wherein the cell group comprises:
a first cell configured with a control channel; and
at least one secondary cell different from the first cell; and
timing information associated with the at least one secondary cell of the cell group;
keeping the first cell active while the at least one secondary cell is active; and
deactivating the first cell during or after deactivation of each other secondary cell of the cell group.
11. The method of claim 10 , further comprising maintaining configuration of physical uplink control channel (PUCCH) resources of the first cell after the first cell is deactivated.
12. The method of claim 10 , further comprising restarting a deactivation timer after a physical downlink control channel (PDCCH) on the first cell indicates an uplink grant or a downlink assignment.
13. The method of claim 10 , further comprising restarting a deactivation timer associated with the first cell after a physical downlink control channel (PDCCH) indicates an uplink grant for the first cell or a downlink assignment for the first cell.
14. The method of claim 10 , further comprising receiving configuration parameters of physical uplink control channel (PUCCH) resources of the first cell.
15. The method of claim 10 , further comprising receiving information that maps a plurality of secondary cells to the cell group.
16. The method of claim 10 , further comprising transmitting, via the first cell, at least one of:
channel state information associated with the at least one secondary cell;
positive acknowledgement associated with the at least one secondary cell;
negative acknowledgement associated with the at least one secondary cell; or
a scheduling request associated with the at least one secondary cell.
17. The method of claim 10 , wherein the keeping the first cell active is after a condition for deactivation of the first cell being satisfied.
18. The method of claim 17 , wherein the condition for deactivation of the first cell comprises at least one of:
an expiration of a deactivation timer associated with the first cell;
a medium access control (MAC) control element indicating deactivation of the first cell; or
a radio resource control message.
19. 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:
configuration parameters of a cell group, wherein the cell group comprises:
a first cell configured with a control channel; and
at least one secondary cell different from the first cell; and
timing information associated with the at least one secondary cell of the cell group;
keep a state of the first cell active while the at least one secondary cell is active; and
change the state of the first cell to deactivated during or after deactivation of each other secondary cell of the cell group.
20. The base station of claim 19 , wherein the instructions, when executed by the one or more processors, further cause the base station to maintain configuration of physical uplink control channel (PUCCH) resources of the first cell after the state of the first cell is changed.
21. The base station of claim 19 , wherein the instructions, when executed by the one or more processors, further cause the base station to restart a deactivation timer after a physical downlink control channel (PDCCH) on the first cell indicates an uplink grant or a downlink assignment.
22. The base station of claim 19 , wherein the instructions, when executed by the one or more processors, further cause the base station to restart a deactivation timer associated with the first cell after a physical downlink control channel (PDCCH) indicates an uplink grant for the first cell or a downlink assignment for the first cell.
23. The base station of claim 19 , wherein the instructions, when executed by the one or more processors, further cause the base station to transmit, to the wireless device, configuration parameters of physical uplink control channel (PUCCH) resources of the first cell.
24. The base station of claim 19 , wherein the instructions, when executed by the one or more processors, further cause the base station to transmit, to the wireless device, information that maps a plurality of secondary cells to the cell group.
25. The base station of claim 19 , wherein the instructions, when executed by the one or more processors, further cause the base station to receive, via the first cell, at least one of:
channel state information associated with the at least one secondary cell;
positive acknowledgement associated with the at least one secondary cell;
negative acknowledgement associated with the at least one secondary cell; or
a scheduling request associated with the at least one secondary cell.
26. The base station of claim 19 , wherein the instructions, when executed by the one or more processors, further cause the base station to keep the state of the first cell active by keeping, after a condition for deactivation of the first cell is satisfied, the state of the first cell active for a time interval.
27. The base station of claim 26 , wherein the condition for deactivation of the first cell comprises at least one of:
an expiration of a deactivation timer associated with the first cell;
a medium access control (MAC) control element indicating deactivation of the first cell; or
a radio resource control message.
28. A method comprising:
transmitting, by a base station:
configuration parameters of a cell group, wherein the cell group comprises:
a first cell configured with a control channel; and
at least one secondary cell different from the first cell; and
timing information associated with the at least one secondary cell of the cell group;
keeping a state of the first cell active while the at least one secondary cell is active; and
changing the state of the first cell to deactivated during or after deactivation of each other secondary cell of the cell group.
29. The method of claim 28 , further comprising maintaining configuration of physical uplink control channel (PUCCH) resources of the first cell after the state of the first cell is changed.
30. The method of claim 28 , further comprising restarting a deactivation timer after a physical downlink control channel (PDCCH) on the first cell indicates an uplink grant or a downlink assignment.
31. The method of claim 28 , further comprising restarting a deactivation timer associated with the first cell after a physical downlink control channel (PDCCH) indicates an uplink grant for the first cell or a downlink assignment for the first cell.
32. The method of claim 28 , further comprising transmitting configuration parameters of physical uplink control channel (PUCCH) resources of the first cell.
33. The method of claim 28 , further comprising transmitting information that maps a plurality of secondary cells to the cell group.
34. The method of claim 28 , further comprising receiving, via the first cell, at least one of:
channel state information associated with the at least one secondary cell;
positive acknowledgement associated with the at least one secondary cell;
negative acknowledgement associated with the at least one secondary cell; or
a scheduling request associated with the at least one secondary cell.
35. The method of claim 28 , wherein the keeping the state of the first cell active comprises: keeping, after a condition for deactivation of the first cell is satisfied, the state of the first cell active for a time interval.
36. The method of claim 35 , wherein the condition for deactivation of the first cell comprises at least one of:
an expiration of a deactivation timer associated with the first cell;
a medium access control (MAC) control element indicating deactivation of the first cell; or
a radio resource control message.
37. A non-transitory computer-readable medium storing instructions that, when executed, configure a wireless device to:
receive, from a base station:
configuration parameters of a cell group, wherein the cell group comprises:
a first cell configured with a control channel; and
at least one secondary cell different from the first cell; and
timing information associated with the at least one secondary cell of the cell group;
keep the first cell active while the at least one secondary cell is active; and
deactivate the first cell during or after deactivation of each other secondary cell of the cell group.
38. The non-transitory computer-readable medium of claim 37 , wherein the instructions, when executed, configure the wireless device to maintain configuration of physical uplink control channel (PUCCH) resources of the first cell after the first cell is deactivated.
39. The non-transitory computer-readable medium of claim 37 , wherein the instructions, when executed, configure the wireless device to keep the first cell active after a condition for deactivation of the first cell being satisfied.
40. A non-transitory computer-readable medium storing instructions that, when executed, configure a base station to:
transmit, to a wireless device:
configuration parameters of a cell group, wherein the cell group comprises:
a first cell configured with a control channel; and
at least one secondary cell different from the first cell; and
timing information associated with the at least one secondary cell of the cell group;
keep a state of the first cell active while the at least one secondary cell is active; and
change the state of the first cell to deactivated during or after deactivation of each other secondary cell of the cell group.
41. The non-transitory computer-readable medium of claim 40 , wherein the instructions, when executed, configure the base station to maintain configuration of physical uplink control channel (PUCCH) resources of the first cell after the state of the first cell is changed.
42. The non-transitory computer-readable medium of claim 40 , wherein the instructions, when executed, configure the base station to keep the state of the first cell active by keeping, after a condition for deactivation of the first cell is satisfied, the state of the first cell active for a time interval.
43. A system comprising:
a base station; and
a wireless device,
wherein the base station is configured to:
transmit, to the wireless device:
configuration parameters of a cell group, wherein the cell group comprises:
a first cell configured with a control channel; and
at least one secondary cell different from the first cell; and
timing information associated with the at least one secondary cell of the cell group, and
wherein the wireless device is configured to:
keep the first cell active while the at least one secondary cell is active; and
deactivate the first cell during or after deactivation of each other secondary cell of the cell group.
44. The system of claim 43 , wherein the wireless device is configured to maintain configuration of physical uplink control channel (PUCCH) resources of the first cell after the first cell is deactivated.
45. The system of claim 43 , wherein the wireless device is configured to restart a deactivation timer after a physical downlink control channel (PDCCH) on the first cell indicates an uplink grant or a downlink assignment.
46. The system of claim 43 , wherein the wireless device is configured to keep the first cell active after a condition for deactivation of the first cell being satisfied.