Uplink transmission power control of a wireless device in a wireless network
A wireless device receives at least one message from a base station. The at least one message comprises: configuration parameters of cells; a transmit power control (TPC) radio network temporary identifier (RNTI); a primary TPC index for the primary PUCCH; and a secondary TPC index for the secondary PUCCH. The configuration parameters of cells comprise: a primary cell with a primary physical uplink control channel (PUCCH); and a secondary cell with a secondary PUCCH. A common search space is searched for a downlink control information (DCI) associated with the TPC RNTI. The DCI comprises an array of TPC commands. The secondary TPC index identifies a TPC command in the array. The uplink signal transmission power of the secondary PUCCH is adjusted based on the TPC command.
1. A method comprising:
receiving, by a wireless device from a base station, at least one message comprising:
configuration parameters of cells comprising:
a primary cell with a primary physical uplink control channel (PUCCH); and
a secondary cell with a secondary PUCCH;
a transmit power control (TPC) radio network temporary identifier (RNTI);
a primary TPC index for the primary PUCCH; and
a secondary TPC index for the secondary PUCCH;
searching a common search space for a downlink control information (DCI) associated with the TPC RNTI, wherein:
the DCI comprises an array of TPC commands; and
the secondary TPC index identifies a TPC command in the array; and
adjusting uplink signal transmission power of the secondary PUCCH based on the TPC command.
2. The method of claim 1 , further comprising detecting the DCI.
3. The method of claim 2 , further comprising receiving an activation control element, from the base station, indicating activation of the secondary cell.
4. The method of claim 3 , wherein the cells are grouped into PUCCH groups comprising:
a primary PUCCH group comprising the primary cell with the primary PUCCH transmitted to the base station; and
a secondary PUCCH group comprising the secondary cell with the secondary PUCCH transmitted to the base station.
5. The method of claim 4 , wherein:
the primary TPC index indicates a first DCI format;
the secondary TPC index indicates the first DCI format;
the secondary TPC index having a different TPC index value from the primary TPC index; and
the DCI is of the first DCI format.
6. The method of claim 5 , wherein:
the array of TPC commands comprises the TPC command and a first TPC command; and
the primary TPC index identifies the first TPC command in the array.
7. The method of claim 6 , further comprising adjusting uplink signal transmission power of the primary PUCCH employing the first TPC command.
8. The method of claim 7 , wherein a first format of a TPC index indicates that one of the following is used as the TPC index value:
a number between 1 to 15; and
a number between 1 to 31.
9. The method of claim 8 , wherein:
the TPC command is encoded by two bits based on the first DCI format being employed; or
the TPC command is encoded by one bit based on a second DCI format being employed.
10. The method of claim 9 , wherein the searching comprises blind decoding for the DCI having a first format.
11. The method of claim 10 , wherein the DCI is encoded employing a cyclic redundancy check.
12. The method of claim 11 , further comprising activating the secondary cell by the wireless device.
13. The method of claim 1 , further comprising receiving an activation control element, from the base station, indicating activation of the secondary cell.
14. The method of claim 13 , wherein the cells are grouped into PUCCH groups comprising:
a primary PUCCH group comprising the primary cell with the primary PUCCH transmitted to the base station; and
a secondary PUCCH group comprising the secondary cell with the secondary PUCCH transmitted to the base station.
15. The method of claim 14 , wherein:
the primary TPC index indicates a first DCI format;
the secondary TPC index indicates the first DCI format;
the secondary TPC index having a different index value from the primary TPC index; and
the DCI is of the first DCI format.
16. The method of claim 15 , wherein:
the array of TPC commands comprises the TPC command and a first TPC command; and
the primary TPC index identifies the first TPC command in the array.
17. The method of claim 16 , further comprising adjusting uplink signal transmission power of the primary PUCCH employing the first TPC command.
18. The method of claim 1 , further comprising
searching the common search space for a second DCI associated with the TPC RNTI, wherein:
the second DCI comprises a second array of TPC commands; and
the secondary TPC index identifies a second TPC command in the second array; and
not applying the second TPC command to uplink transmissions based on the secondary cell being deactivated.
19. The method of claim 1 , wherein the cells are grouped into PUCCH groups comprising:
a primary PUCCH group comprising the primary cell with the primary PUCCH transmitted to the base station; and
a secondary PUCCH group comprising the secondary cell with the secondary PUCCH transmitted to the base station.
20. The method of claim 19 , wherein:
the primary TPC index indicates a first DCI format;
the secondary TPC index indicates the first DCI format;
the secondary TPC index having a different index value from the primary TPC index; and
the DCI is of the first DCI format.