Configuration of Multiple Timing Advance Groups in Wireless Communication Devices

1 . A method comprising:

receiving, by a wireless device from a base station, at least one radio resource control message comprising a plurality of configuration parameters for a plurality of random access channel resources;

measuring, by the wireless device, radio link quality of at least one radio link between the wireless device and the base station; and

transmitting, by the wireless device, to the base station, and via at least one of the plurality of random access channel resources, a preamble selected based on the radio link quality.

2 . The method of claim 1 , wherein the plurality of configuration parameters comprises:

a plurality of random access resource parameters; and

a plurality of power control parameters for random access preamble transmission.

3 . The method of claim 1 , further comprising:

receiving, from the base station via a primary cell, a random access response.

4 . The method of claim 1 , further comprising:

receiving, from the base station, an indication of the preamble, wherein the indication comprises at least one of: a preamble identifier (ID) or the at least one of the plurality of random access channel resources.

5 . The method of claim 1 , wherein:

the plurality of configuration parameters for the plurality of random access channel resources are for a plurality of cells grouped into a plurality of cell groups;

the plurality of cell groups comprise a primary cell group and a secondary cell group; and

the secondary cell group comprises a plurality of secondary cells.

6 . The method of claim 5 , wherein:

uplink transmission timing associated with the primary cell group is based on a first cell of the primary cell group; and

uplink transmission timing associated with the secondary cell group is based on a second cell of the secondary cell group.

7 . The method of claim 5 , further comprising:

transmitting, to the base station, an indication of radio link quality of the plurality of secondary cells;

receiving, from the base station, an indication of a random access channel resource, of the plurality of random access channel resources, associated with a secondary cell of the plurality of secondary cells; and

receiving, from the base station, a command to cause the transmitting the preamble.

8 . A method comprising:

transmitting, by a base station to a wireless device, at least one radio resource control message comprising a plurality of configuration parameters for a plurality of random access channel resources;

receiving, by the base station from the wireless device, an indication of radio link quality of at least one radio link between the wireless device and the base station; and

receiving, by the base station, from the wireless device, and via at least one of the plurality of random access channel resources, a preamble selected based on the radio link quality.

9 . The method of claim 8 , wherein the plurality of configuration parameters comprises:

a plurality of random access resource parameters; and

a plurality of power control parameters for random access preamble transmission.

10 . The method of claim 8 , further comprising:

transmitting, to the wireless device via a primary cell, a random access response.

11 . The method of claim 8 , further comprising:

selecting, by the base station and based on the indication of the radio link quality of the at least one radio link between the wireless device and the base station, the preamble; and

transmitting, to the wireless device, an indication of the preamble, wherein the indication comprises at least one of: a preamble identifier (ID) or the at least one of the plurality of random access channel resources.

12 . The method of claim 8 , wherein:

the plurality of configuration parameters for the plurality of random access channel resources are for a plurality of cells grouped into a plurality of cell groups;

the plurality of cell groups comprise a primary cell group and a secondary cell group; and

the secondary cell group comprises a plurality of secondary cells.

13 . The method of claim 12 , wherein:

uplink transmission timing associated with the primary cell group is based on a first cell of the primary cell group; and

uplink transmission timing associated with the secondary cell group is based on a second cell of the secondary cell group.

14 . The method of claim 12 , further comprising:

receiving, from the wireless device, an indication of radio link quality of the plurality of secondary cells;

transmitting, to the wireless device, an indication of a random access channel resource, of the plurality of random access channel resources, associated with a secondary cell of the plurality of secondary cells; and

transmitting, to the wireless device, a command to cause transmission of the preamble.

15 . 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, at least one radio resource control message comprising a plurality of configuration parameters for a plurality of random access channel resources;

measure radio link quality of at least one radio link between the wireless device and the base station; and

transmit, to the base station via at least one of the plurality of random access channel resources, a preamble selected based on the radio link quality.

16 . The wireless device of claim 15 , wherein the plurality of configuration parameters comprises:

a plurality of random access resource parameters; and

a plurality of power control parameters for random access preamble transmission.

17 . The wireless device of claim 15 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:

receive, from the base station via a primary cell, a random access response.

18 . The wireless device of claim 15 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:

receive, from the base station, an indication of the preamble, wherein the indication comprises at least one of: a preamble identifier (ID) or the at least one of the plurality of random access channel resources.

19 . The wireless device of claim 15 , wherein:

the plurality of configuration parameters for the plurality of random access channel resources are for a plurality of cells grouped into a plurality of cell groups;

the plurality of cell groups comprise a primary cell group and a secondary cell group; and

the secondary cell group comprises a plurality of secondary cells.

20 . The wireless device of claim 19 , wherein:

uplink transmission timing associated with the primary cell group is based on a first cell of the primary cell group; and

uplink transmission timing associated with the secondary cell group is based on a second cell of the secondary cell group.

21 . The wireless device of claim 19 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:

transmit, to the base station, an indication of radio link quality of the plurality of secondary cells;

receive, from the base station, an indication of a random access channel resource, of the plurality of random access channel resources, associated with a secondary cell of the plurality of secondary cells; and

receive, from the base station, a command to cause transmission of the preamble.

22 . 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, at least one radio resource control message comprising a plurality of configuration parameters for a plurality of random access channel resources;

receive, from the wireless device, an indication of radio link quality of at least one radio link between the wireless device and the base station; and

receive, from the wireless device via at least one of the plurality of random access channel resources, a preamble selected based on the radio link quality.

23 . The base station of claim 22 , wherein the plurality of configuration parameters comprises:

a plurality of random access resource parameters; and

a plurality of power control parameters for random access preamble transmission.

24 . The base station of claim 22 , wherein the instructions, when executed by the one or more processors, further cause the base station to:

transmit, to the wireless device via a primary cell, a random access response.

25 . The base station of claim 22 , wherein the instructions, when executed by the one or more processors, further cause the base station to:

select, based on the indication of the radio link quality of the at least one radio link between the wireless device and the base station, the preamble; and

transmit, to the wireless device, an indication of the preamble, wherein the indication comprises at least one of: a preamble identifier (ID) or the at least one of the plurality of random access channel resources.

26 . The base station of claim 22 , wherein:

the plurality of configuration parameters for the plurality of random access channel resources are for a plurality of cells grouped into a plurality of cell groups;

the plurality of cell groups comprise a primary cell group and a secondary cell group; and

the secondary cell group comprises a plurality of secondary cells.

27 . The base station of claim 26 , wherein:

uplink transmission timing associated with the primary cell group is based on a first cell of the primary cell group; and

uplink transmission timing associated with the secondary cell group is based on a second cell of the secondary cell group.

28 . The base station of claim 26 , wherein the instructions, when executed by the one or more processors, further cause the base station to:

receive, from the wireless device, an indication of radio link quality of the plurality of secondary cells;

transmit, to the wireless device, an indication of a random access channel resource, of the plurality of random access channel resources, associated with a secondary cell of the plurality of secondary cells; and

transmit, to the wireless device, a command to cause transmission of the preamble.