Carrier grouping in multicarrier wireless networks
Methods, systems, and apparatuses are described for wireless communications. Cells may be grouped into a plurality of cell groups. A base station may transmit a control message to modify a cell group of a cell associated with a wireless device.
1. A method comprising:
transmitting, by a base station, at least one control message configured to change grouping of a cell of a plurality of cells that are grouped into a plurality of cell groups, wherein uplink transmission timing of each cell group of the plurality of cell groups is based on one cell in that cell group, and wherein the at least one control message comprises, based on the cell of the plurality of cells being a primary cell, mobility control information.
2. The method of claim 1 , wherein the at least one control message is associated with a handover of a wireless device from the base station to a second base station.
3. The method of claim 1 , wherein the at least one control message is associated with a handover of a wireless device from a first sector of the base station to a second sector of the base station.
4. The method of claim 1 , further comprising transmitting a timer value for a time alignment timer for each of the plurality of cell groups.
5. The method of claim 1 , wherein the control message comprises a radio resource control connection reconfiguration message.
6. The method of claim 1 , further comprising transmitting a second control message, wherein the second control message does not comprise mobility control information, and wherein the second control message is configured to explicitly release a secondary cell as part of a cell grouping modification for the secondary cell.
7. The method of claim 1 , wherein the at least one control message is configured to change the grouping of the primary cell from a first cell group to a second cell group, the method further comprising communicating via the primary cell as part of the second cell group.
8. The method of claim 7 , wherein the first cell group comprises a first one or more secondary cells and the second cell group comprises a second one or more secondary cells.
9. The method of claim 1 , wherein the control message does not comprise an information element releasing the cell.
10. The method of claim 1 , wherein the at least one control message is configured to change the grouping of the cell while maintaining the cell as a primary cell.
11. 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 at least one control message configured to change grouping of a cell of a plurality of cells that are grouped into a plurality of cell groups, wherein uplink transmission timing of each cell group of the plurality of cell groups is based on one cell in that cell group, and wherein the at least one control message comprises, based on the cell of the plurality of cells being a primary cell, mobility control information.
12. The base station of claim 11 , wherein the at least one control message is associated with a handover of a wireless device from the base station to a second base station.
13. The base station of claim 11 , wherein the at least one control message is associated with a handover of a wireless device from a first sector of the base station to a second sector of the base station.
14. The base station of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the base station to transmit a timer value for a time alignment timer for each of the plurality of cell groups.
15. The base station of claim 11 , wherein the control message comprises a radio resource control connection reconfiguration message.
16. The base station of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the base station to transmit a second control message, wherein the second control message does not comprise mobility control information, and wherein the second control message is configured to explicitly release a secondary cell as part of a cell grouping modification for the secondary cell.
17. The base station of claim 11 , wherein the at least one control message is configured to change the grouping of the primary cell from a first cell group to a second cell group, and wherein the instructions, when executed by the one or more processors, further cause the base station to communicate via the primary cell as part of the second cell group.
18. The base station of claim 17 , wherein the first cell group comprises a first one or more secondary cells and the second cell group comprises a second one or more secondary cells.
19. The base station of claim 11 , wherein the control message does not comprise an information element releasing the cell.
20. The base station of claim 11 , wherein the at least one control message is configured to change the grouping of the cell while maintaining the cell as a primary cell.
21. A non-transitory computer-readable medium storing instructions that, when executed, configure a base station to:
transmit at least one control message configured to change grouping of a cell of a plurality of cells that are grouped into a plurality of cell groups, wherein uplink transmission timing of each cell group of the plurality of cell groups is based on one cell in that cell group, and wherein the at least one control message comprises, based on the cell of the plurality of cells being a primary cell, mobility control information.
22. The non-transitory computer-readable medium of claim 21 , wherein the at least one control message is associated with a handover of a wireless device from the base station to a second base station.
23. The non-transitory computer-readable medium of claim 21 , wherein the at least one control message is associated with a handover of a wireless device from a first sector of the base station to a second sector of the base station.
24. The non-transitory computer-readable medium of claim 21 , wherein the instructions, when executed, further configure the base station to transmit a timer value for a time alignment timer for each of the plurality of cell groups.
25. The non-transitory computer-readable medium of claim 21 , wherein the control message comprises a radio resource control connection reconfiguration message.
26. The non-transitory computer-readable medium of claim 21 , wherein the instructions, when executed, further configure the base station to transmit a second control message, wherein the second control message does not comprise mobility control information, and wherein the second control message is configured to explicitly release a secondary cell as part of a cell grouping modification for the secondary cell.
27. The non-transitory computer-readable medium of claim 21 , wherein the at least one control message is configured to change the grouping of the primary cell from a first cell group to a second cell group, and wherein the instructions, when executed, further configure the base station to communicate via the primary cell as part of the second cell group.
28. The non-transitory computer-readable medium of claim 27 , wherein the first cell group comprises a first one or more secondary cells and the second cell group comprises a second one or more secondary cells.
29. The non-transitory computer-readable medium of claim 21 , wherein the control message does not comprise an information element releasing the cell.
30. The non-transitory computer-readable medium of claim 21 , wherein the at least one control message is configured to change the grouping of the cell while maintaining the cell as a primary cell.
31. A system comprising:
a base station; and
a wireless device,
wherein the base station is configured to:
transmit at least one control message configured to change grouping of a cell of a plurality of cells that are grouped into a plurality of cell groups, wherein uplink transmission timing of each cell group of the plurality of cell groups is based on one cell in that cell group, and wherein the at least one control message comprises, based on the cell of the plurality of cells being a primary cell, mobility control information, and
wherein the wireless device is configured to:
receive the at least one control message; and
communicate via the cell.
32. The system of claim 31 , wherein the at least one control message is associated with a handover of the wireless device from the base station to a second base station.
33. The system of claim 31 , wherein the at least one control message is associated with a handover of the wireless device from a first sector of the base station to a second sector of the base station.
34. The system of claim 31 , wherein the base station is further configured to transmit a second control message, wherein the second control message does not comprise mobility control information, and wherein the second control message is configured to explicitly release a secondary cell as part of a cell grouping modification for the secondary cell.
35. The system of claim 31 , wherein the at least one control message is configured to change the grouping of the primary cell from a first cell group to a second cell group, and wherein each of the base station and the wireless device is further configured to communicate via the primary cell as part of the second cell group.
36. The system of claim 31 , wherein the at least one control message is configured to change the grouping of the cell while maintaining the cell as a primary cell.