Timing in a multicarrier wireless device

1. A method comprising:

a) receiving, by a wireless device, at least one control message from a base station, said at least one control message causing in said wireless device:

i) configuration of a plurality of cells comprising a primary cell and a plurality of secondary cells;

ii) configuration of a deactivation timer for a secondary cell in said plurality of secondary cells, said deactivation timer corresponding to a secondary cell restarting in response to a packet transmission on said secondary cell, said corresponding secondary cell deactivated in said wireless device in response to said deactivation timer expiring; and

iii) assignment of each of said plurality of secondary cells to a cell group in a plurality of cell groups, said plurality of cell groups comprising:

(1) a primary cell group comprising a first subset of said plurality of cells, said first subset comprising said primary cell, uplink transmissions by said wireless device in said primary cell group employing a first synchronization signal transmitted on said primary cell as a primary timing reference; and

(2) a secondary cell group comprising a second subset of said plurality of secondary cells;

b) receiving, by said wireless device, a control command configured to cause transmission of a random access preamble on random access resources of a reference secondary cell in said secondary cell group; and

c) receiving, by said wireless device, a random access response on said primary cell in said primary cell group, said random access response comprising a timing advance command for said secondary cell group;

d) transmitting first uplink signals in said secondary cell group, by said wireless device, employing a second synchronization signal on said reference secondary cell in said secondary cell group as a secondary timing reference, said reference secondary cell being an activated cell in said secondary cell group;

e) selecting, autonomously by said wireless device, a new activated secondary cell in said secondary cell group as said secondary timing reference if all of the following conditions are satisfied:

i) said reference secondary cell is deactivated or released in said wireless device; and

ii) at least one secondary cell in said secondary cell group is active in said wireless device; and

f) transmitting second uplink signals in said secondary cell group, by said wireless device, employing a third synchronization signal on said new activated secondary cell as said secondary timing reference.

2. The method of claim 1 , wherein said selection is performed autonomously by said wireless device without said wireless device informing said base station.

3. The method of claim 1 , wherein said deactivation timer corresponding to said secondary cell restarts in response to receiving an activation command for said secondary cell.

4. The method of claim 1 , wherein said at least one control message comprises a plurality of media access control dedicated parameters comprising a deactivation timer value, said deactivation timer value employed for each of said deactivation timers for said plurality of secondary cells.

5. The method of claim 1 , further comprising receiving, by said base station, said random access preamble on said random access resources, transmission timing of said random access preamble being determined, at least in part, employing said second synchronization signal transmitted on said reference secondary cell.

6. The method of claim 1 , wherein said at least one control message causes configuration of said random access resources.

7. The method of claim 1 , further comprising transmitting, by said base station, at least one timing advance command to said wireless device, said timing advance command comprising:

a) a time adjustment value; and

b) an index identifying said secondary cell group; and

wherein said at least one timing advance command is configured to cause substantial alignment of reception timing of said uplink signals in frames and subframes of said secondary cell group at said base station.

8. The method of claim 1 , wherein said wireless device is assigned, by said configuration, a plurality of media access control dedicated parameters comprising a plurality of time alignment timer values, each of said plurality of time alignment timer values being associated with a unique cell group in said wireless device.

9. A method comprising:

a) receiving, by a wireless device, at least one control message from a base station, said at least one control message causing in said wireless device:

i) configuration of a plurality of cells comprising a primary cell and a plurality of secondary cells; and

ii) assignment of each of said plurality of secondary cells to a cell group in a plurality of cell groups, said plurality of cell groups comprising a primary cell group and a secondary cell group comprising a subset of said plurality of secondary cells;

b) receiving, by said wireless device, a control command configured to cause transmission of a random access preamble on random access resources of a reference secondary cell in said secondary cell group; and

c) receiving, by said wireless device, a random access response on said primary cell in said primary cell group, said random access response comprising a timing advance command for said secondary cell group;

d) transmitting first uplink signals in said secondary cell group, by said wireless device, employing a first synchronization signal on said reference secondary cell in said secondary cell group as a timing reference, said reference secondary cell being an activated cell in said secondary cell group;

e) selecting, autonomously by said wireless device, a new activated secondary cell in said secondary cell group as said timing reference if all of the following conditions are satisfied:

i) said reference secondary cell is deactivated or released in said wireless device; and

ii) at least one secondary cell in said secondary cell group is active in said wireless device; and

f) transmitting second uplink signals in said secondary cell group, by said wireless device, employing a second synchronization signal on said new activated secondary cell as said timing reference.

10. The method of claim 9 , wherein said wireless device does not monitor said reference secondary cell when said reference secondary cell is deactivated.

11. The method of claim 9 , wherein said selection is performed autonomously by said wireless device without said wireless device informing said base station.

12. The method of claim 9 , wherein said at least one control message comprises at least one cell add-modify information element, each of said at least one cell add-modify information element comprising a first plurality of dedicated parameters in a plurality of dedicated parameters, said first plurality of dedicated parameters comprising a first cell index for a first secondary cell in said at least one secondary cell.

13. The method of claim 9 , further comprising receiving an activation command causing activation of said new activated secondary cell in said wireless device.

14. The method of claim 9 , wherein said at least one control message is configured to further cause in said wireless device configuration of a time alignment timer for each of said plurality of cell groups, said time alignment timer starting or restarting in response to said wireless device receiving a timing advance command to adjust uplink transmission timing of a commanded cell group in said plurality of cell groups.

15. A wireless device comprising:

a) one or more communication interfaces;

b) one or more processors; and

c) memory storing instructions that, when executed, cause said wireless device to:

i) receive at least one control message from a base station, said at least one control message causing in said wireless device:

(1) configuration of a plurality of cells comprising a primary cell and a plurality of secondary cells; and

(2) assignment of each of said plurality of secondary cells to a cell group in a plurality of cell groups, said plurality of cell groups comprising:

(a) a primary cell group comprising a first subset of said plurality of cells, said first subset comprising said primary cell; and

(b) a secondary cell group comprising a second subset of said plurality of secondary cells;

ii) receive a control command configured to cause transmission of a random access preamble on random access resources of a reference secondary cell in said secondary cell group; and

iii) receive a random access response on said primary cell in said primary cell group, said random access response comprising a timing advance command for said secondary cell group;

iv) transmit first uplink signals in said secondary cell group employing a first synchronization signal on said reference secondary cell in said secondary cell group as a secondary timing reference, said reference secondary cell being an activated cell in said secondary cell group;

v) autonomously select, when a predefined condition is met and without said wireless device informing said base station, a new activated secondary cell in said secondary cell group as said secondary timing reference, said new activated secondary cell being different from said reference secondary cell; and

vi) transmit second uplink signals in said secondary cell group, by said wireless device, employing a second synchronization signal on said new activated secondary cell as said secondary timing reference.

16. The wireless device of claim 15 , wherein a deactivation timer corresponding to said secondary cell restarts in response to receiving an activation command for said secondary cell.

17. The wireless device of claim 15 , wherein said at least one control message comprises a plurality of media access control dedicated parameters comprising a deactivation timer value, said deactivation timer value employed for each of said deactivation timers for said plurality of secondary cells.

18. The wireless device of claim 15 , wherein said at least one control message causes configuration of said random access resources.

19. The wireless device of claim 15 , wherein said at least one control message is further configured to modify a radio bearer.