Power Headroom in a Wireless Network

1 . A method comprising:

receiving, by a wireless device, at least one message comprising configuration parameters of a plurality of cells comprising:

a primary cell with a primary physical uplink control channel (PUCCH) transmitted to a base station; and

a PUCCH secondary cell with a secondary PUCCH transmitted to the base station; and

transmitting a power headroom report (PHR) media-access-control control element (MAC CE) comprising:

a first field indicating whether a Type 2 power headroom field for the PUCCH secondary cell is present in the PHR MAC CE; and

a second field indicating a Type 2 power headroom level for the PUCCH secondary cell only if the first field indicates the presence of the Type 2 power headroom field for the PUCCH secondary cell.

2 . The method of claim 1 , wherein the at least one message further comprises a first information element indicating whether simultaneous PUCCH transmission and physical uplink shared channel transmission is configured for the primary cell.

3 . The method of claim 1 , wherein the at least one message further comprises a second information element indicating whether simultaneous PUCCH transmission and physical uplink shared channel transmission is configured for the PUCCH secondary cell.

4 . The method of claim 1 , wherein the PHR MAC CE further comprises a third field indicating a Type 2 power headroom level for the primary cell.

5 . The method of claim 1 , wherein the wireless device reports the Type 2 power headroom level for the PUCCH secondary cell when the PUCCH secondary cell is activated.

6 . The method of claim 1 , wherein the PHR MAC CE comprises a Type 1 power headroom field for the PUCCH secondary cell different from the Type 2 power headroom field.

7 . The method of claim 1 , wherein:

a calculation of the Type 2 power headroom level employs a calculated power of a physical uplink control channel and a calculated power of a physical uplink shared channel; and

a calculation of a Type 1 power headroom level employs the calculated power of a physical uplink shared channel.

8 . The method of claim 1 , further comprising obtaining a measurement value by measuring a signal of a pathloss reference, wherein the a calculation of the Type 2 power headroom level employs the measurement value.

9 . The method of claim 1 , wherein the PHR MAC CE is employed by the base station for at least one of uplink packet scheduling or uplink power control.

10 . A method comprising:

transmitting, by a base station, at least one message comprising configuration parameters of a plurality of cells comprising:

a primary cell with a primary physical uplink control channel (PUCCH) received by the base station; and

a PUCCH secondary cell with a secondary PUCCH received by the base station; and

receiving a power headroom report (PHR) media-access-control control element (MAC CE) comprising:

a first field indicating that a Type 2 power headroom field for the PUCCH secondary cell is present in the PHR MAC CE;

a second field indicating Type 2 power headroom level for the PUCCH secondary cell; and

a third field indicating Type 2 power headroom level for the primary cell.

11 . The method of claim 10 , wherein the at least one message further comprises a first information element indicating whether simultaneous PUCCH transmission and physical uplink shared channel transmission is configured for the primary cell.

12 . The method of claim 10 , wherein the at least one message further comprises a second information element indicating whether simultaneous PUCCH transmission and physical uplink shared channel transmission is configured for the PUCCH secondary cell.

13 . The method of claim 10 , wherein the PHR MAC CE further comprises a fourth field indicating a Type 1 power headroom level for the primary cell.

14 . The method of claim 10 , wherein the base station receives the Type 2 power headroom level for the PUCCH secondary cell when the PUCCH secondary cell is activated in the wireless device.

15 . The method of claim 10 , wherein the PHR MAC CE comprises a Type 1 power headroom field for the PUCCH secondary cell different from the Type 2 power headroom field for the PUCCH secondary cell.

16 . The method of claim 10 , wherein:

a calculation of the Type 2 power headroom level employs a calculated power of a physical uplink control channel and a calculated power of a physical uplink shared channel; and

a calculation of a Type 1 power headroom level employs a calculated power of a physical uplink shared channel.

17 . The method of claim 10 , further comprising obtaining a measurement value by measuring a signal of a pathloss reference, wherein a calculation of the Type 2 power headroom level employs the measurement value.

18 . The method of claim 10 , wherein the PHR MAC CE is employed by the base station for at least one of uplink packet scheduling or uplink power control.

19 . A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed, cause the wireless device to:

receiving, from a base station, at least one message comprising configuration parameters of a plurality of cells comprising:

a primary cell with a primary PUCCH transmitted to the base station; and

a PUCCH secondary cell with a secondary PUCCH transmitted to the base station; and

transmitting a power headroom report (PHR) media-access-control control element (MAC CE) comprising:

a first field indicating whether a Type 2 power headroom field for the PUCCH secondary cell is present in the PHR MAC CE; and

a second field indicating a Type 2 power headroom level for the PUCCH secondary cell only if the first field indicates the presence of the Type 2 power headroom field for the PUCCH secondary cell.

20 . The method of claim 19 , wherein the PHR MAC CE comprises a Type 1 power headroom field for the PUCCH secondary cell different from the Type 2 power headroom field.