Cell configuration in a wireless device and wireless network

1. A method comprising:

receiving, by a wireless device, at least one message comprising configuration parameters of a first cell in a plurality of cells, the plurality of cells grouped into one or more cross-carrier scheduling groups comprising a first cross-carrier scheduling group, the first cross-carrier scheduling group comprising the first cell and a second cell, each of the first cell and the second cell identified by a respective cell identifier employing a first number of bits, wherein the configuration parameters:

indicate that the second cell is employed for cross carrier scheduling of the first cell; and

comprise a cell identifier and a first cell indicator field, the first cell indicator field employing a second number of bits, wherein the second number is smaller than the first number;

receiving downlink control information on a control channel of the second cell for a packet transmitted on the first cell, the downlink control information comprising the first cell indicator field, the first cell indicator field identifying the first cell; and

receiving the packet on the first cell on radio resources identified by the downlink control information.

2. The method of claim 1 , wherein the cell identifier corresponds to the second cell.

3. The method of claim 1 , wherein:

the cell identifier employs five bits; and

the first cell indicator field employs three bits.

4. The method of claim 1 , wherein the plurality of cells are grouped into a plurality of physical uplink control channel (PUCCH) groups comprising:

a primary PUCCH group comprising a primary cell with a primary PUCCH transmitted to a base station; and

a secondary PUCCH group comprising a PUCCH secondary cell with a secondary PUCCH transmitted to the base station.

5. The method of claim 4 , wherein each cross-carrier scheduling group in the one or more cross-carrier scheduling groups comprises a second plurality of cells that are part of the same physical uplink control channel (PUCCH) group.

6. The method of claim 1 , wherein the cell identifier comprises one or more parameters comprising: a subgroup index and a cell index.

7. The method of claim 1 , further comprising the second cell providing scheduling information for one or more cells, each of the one or more cells identified by a cell indicator field within the first cross-carrier scheduling group.

8. The method of claim 1 , further comprising the second cell providing scheduling information for one or more cells, each of the one or more cells identified by a corresponding cell indicator field within the first cross-carrier scheduling group.

9. The method of claim 1 , wherein the configuration parameters further comprise a starting symbol of a downlink shared channel in a plurality of subframes.

10. The method of claim 1 , wherein the first cell in the first cross-carrier scheduling group and a third cell in a second cross-carrier scheduling group are assigned the same carrier indicator field.

11. A method comprising:

transmitting, by a base station, at least one message comprising configuration parameters of a first cell in a plurality of cells, the plurality of cells grouped into one or more cross-carrier scheduling groups comprising a first cross-carrier scheduling group, first cross-carrier scheduling group comprising the first cell and a second cell, each of the first cell and the second cell identified by a respective cell identifier employing a first number of bits, wherein the configuration parameters:

indicate that the second cell is employed for cross carrier scheduling of the first cell; and

comprise a cell identifier and a first cell indicator field, the first cell indicator field employing a second number of bits, wherein the second number is smaller than the first number;

transmitting downlink control information on a control channel of the second cell for a packet transmitted on the first cell, the downlink control information comprising the first cell indicator field, the first cell indicator field identifying the first cell; and

transmitting the packet on the first cell on radio resources identified by the downlink control information.

12. The method of claim 11 , wherein the cell identifier corresponds to the second cell.

13. The method of claim 11 , wherein:

the cell identifier employs five bits; and

the first cell indicator field employs three bits.

14. The method of claim 11 , wherein the plurality of cells are grouped into a plurality of physical uplink control channel (PUCCH) groups comprising:

a primary PUCCH group comprising a primary cell with a primary PUCCH received by the base station; and

a secondary PUCCH group comprising a PUCCH secondary cell with a secondary PUCCH received by the base station.

15. The method of claim 14 , wherein each cross-carrier scheduling group in the one or more cross-carrier scheduling groups comprises a second plurality of cells that are part of the same physical uplink control channel (PUCCH) group.

16. The method of claim 11 , wherein the cell identifier comprises one or more parameters comprising: a subgroup index and a cell index.

17. The method of claim 11 , further comprising the second cell providing scheduling information for one or more cells, each of the one or more cells identified by a corresponding cell indicator field within the first cross-carrier scheduling group.

18. The method of claim 11 , wherein the second cell provides scheduling information for one or more cells, each of the one or more cells identified by a unique cell indicator field within the first cross-carrier scheduling group.

19. The method of claim 11 , wherein the configuration parameters further comprise a starting symbol of a downlink shared channel in a plurality of subframes.

20. The method of claim 11 , wherein the first cell in the first cross-carrier scheduling group and a third cell in a second cross-carrier scheduling group are assigned the same carrier indicator field.