Wireless device for multicarrier communications

1. A method comprising:

a) establishing a first signaling bearer between a wireless device and a base station on a primary cell, said establishing comprising said wireless device receiving a first control message from said base station on said primary cell in a plurality of cells, said plurality of cells comprising said primary cell and at least one secondary cell; and

b) transmitting, by said wireless device, a plurality of radio capability parameters to said base station on said first signaling bearer on said primary cell, said plurality of radio capability parameters comprising at least one timing advance group capability parameter indicating whether said wireless device supports a plurality of timing advance groups in one or more band combinations; and

wherein, if said at least one timing advance group capability parameter indicates said wireless device supports said plurality of timing advance groups, said wireless device performs all of the following functions:

i) transmitting a random access preamble on at least one of said at least one secondary cell in a secondary cell group;

ii) transmitting in parallel:

(1) a random access preamble on an uplink carrier on one of said at least one secondary cell in said secondary cell group; and

(2) uplink data on at least one other uplink carrier of at least one other cell in said plurality of cells;

iii) transmitting in parallel:

(1) a random access preamble on an uplink carrier on one of said at least one secondary cell in said secondary cell group; and

(2) control data on an uplink physical control channel on at least one other uplink carrier of at least one other cell in said plurality of cells;

iv) applying each of a plurality of media access control (MAC) timing advance commands comprising a timing advance group index to uplink transmission timing of a cell group identified by said timing advance group index;

v) maintaining a plurality of timing advance timers; and

vi) configuring said plurality of timing advance groups, each of said plurality of timing advance groups comprising a distinct subset of said plurality of cells, uplink transmissions on each timing advance group employing a synchronization signal on a downlink carrier of one cell in said distinct subset as a timing reference.

2. The method of claim 1 , wherein said plurality of timing advance groups are for at least one band combination.

3. The method of claim 1 , further comprising said wireless device transmitting in parallel:

a) a random access preamble on an uplink carrier on one of said at least one secondary cell in said secondary cell group; and

b) an uplink sounding reference signal on at least one other uplink carrier of at least one other cell in said plurality of cells.

4. The method of claim 1 , further comprising said wireless device initiating said establishing by transmitting a random access preamble to said base station.

5. The method of claim 1 , wherein said establishing further comprises said wireless device transmitting a radio resource connection request message to said base station.

6. The method of claim 5 , wherein said wireless device transmitting said radio resource connection request in uplink radio resources identified in an uplink grant of a random access response message is received from said base station.

7. The method of claim 1 , wherein said first control message is a radio resource control connection establishment message.

8. The method of claim 1 , wherein said plurality of timing advance groups are for one or more band combinations.

9. The method of claim 1 , wherein said at least one other cell in said plurality of cells does not comprise said one of said at least one secondary cell in said secondary cell group.

10. The method of claim 1 , wherein each of a plurality of MAC timing advance commands comprise a timing advance value.

11. 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) establish a first signaling bearer between a wireless device and a base station on a primary cell in a plurality of cells, said plurality of cells comprising said primary cell and at least one secondary cell; and

ii) transmit a plurality of radio capability parameters to said base station on said first signaling bearer on said primary cell, said plurality of radio capability parameters comprising at least one timing advance group capability parameter indicating whether said wireless device supports a plurality of timing advance groups in one or more band combinations; and

wherein, if said at least one timing advance group capability parameter indicates said wireless device supports said plurality of timing advance groups, said instructions, when executed, further cause said wireless device to:

i) transmit a random access preamble on at least one of said at least one secondary cell in a secondary cell group;

ii) transmit in parallel:

(1) a random access preamble on an uplink carrier on one of said at least one secondary cell in said secondary cell group; and

(2) uplink data on at least one other uplink carrier of at least one other cell in said plurality of cells;

iii) transmit in parallel:

(1) a random access preamble on an uplink carrier on one of said at least one secondary cell in said secondary cell group; and

(2) control data on an uplink physical control channel on at least one other uplink carrier of at least one other cell in said plurality of cells;

iv) apply each of a plurality of media access control (MAC) timing advance commands comprising a timing advance group index to uplink transmission timing of a cell group identified by said timing advance group index;

v) maintain a plurality of timing advance timers; and

vi) configure said plurality of timing advance groups, each of said plurality of timing advance groups comprising a distinct subset of said plurality of cells, uplink transmissions on each timing advance group employing a synchronization signal on a downlink carrier of one cell in said distinct subset as a timing reference.

12. The wireless device of claim 11 , wherein each of said plurality of timing advance timers corresponds to a timing advance group in said plurality of timing advance groups.

13. The wireless device of claim 11 , wherein said random access preamble is transmitted in response to receiving a control command from said base station, said control command comprising an identifier of said random access preamble.

14. The wireless device of claim 11 , wherein said configuring said plurality of timing advance groups comprises assigning each cell in said plurality of cells to a timing advance group in said plurality of timing advance groups.

15. The wireless device of claim 11 , wherein each of a plurality of MAC timing advance commands comprises a timing advance value.

16. A method comprising:

a) establishing a first signaling bearer between a base station and a wireless device on a primary cell, said establishing comprising said base station transmitting a first control message to said wireless device on said primary cell in a plurality of cells, said plurality of cells comprising said primary cell and at least one secondary cell;

b) receiving, by said base station, a plurality of radio capability parameters from said wireless device on said first signaling bearer on said primary cell, said plurality of radio capability parameters comprising at least one timing advance group capability parameter indicating whether said wireless device supports a plurality of timing advance groups in one or more band combinations; and

c) selectively transmitting at least one second control message to said wireless device by said base station if said at least one second timing advance group capability parameter indicates that said wireless device supports said plurality of timing advance groups, said at least one second control message comprising:

i) configuration parameters of at least one secondary cell in said plurality of cells; and

ii) a cell group index for assignment of a secondary cell in said at least one secondary cell to a timing advance group in said plurality of timing advance groups, said plurality of timing advance groups comprising:

(1) a primary timing advance 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 timing advance group employing a first synchronization signal transmitted on said primary cell as a primary timing reference; and

(2) a secondary timing advance group comprising a second subset of said plurality of cells, said second subset comprising a reference secondary cell, uplink transmissions in said secondary timing advance group employing a second synchronization signal on said reference secondary cell as a secondary timing reference.

17. The method of claim 16 , wherein said at least one second control message comprises configuration parameter of a timing advance timer for each of said plurality of timing advance groups, said timing advance timer starting or restarting in response to said wireless device receiving a timing advance command to adjust uplink transmission timing of a commanded timing advance group in said plurality of timing advance groups.

18. The method of claim 16 , wherein said plurality of timing advance groups are for one or more band combinations.

19. The method of claim 16 , wherein said first control message is a radio resource control connection establishment message.

20. The method of claim 16 , wherein said at least one second control message comprises configuration parameters of random access resources on a secondary cell in said secondary timing advance group.