Power headroom report in a wireless device with carrier aggregation
A wireless device transmits a power headroom report media access control control element (PHR MAC CE). The PHR MAC CE comprises a presence field comprising a plurality of presence bits. The presence field is of a fixed size of one octet when up to seven of the one or more secondary cells are each configured with a cell index having a value between one and seven. The presence field is of a fixed size of four octets when the one or more secondary cells comprise more than seven secondary cells with configured uplinks.
1. 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 at least one message comprising:
configuration parameters of one or more secondary cells; and
at least one information element indicating that a first type of extended power headroom is configured, wherein the at least one information element is configured as setup when a secondary cell in the one or more secondary cells is configured with a physical uplink control channel;
receive a power headroom report comprising a presence field, wherein:
the presence field is of a fixed size of one octet when up to seven secondary cells are configured for a wireless device, each cell in the one or more secondary cells having a cell index with a value between one and seven; and
the presence field is of a fixed size of four octets when the one or more secondary cells comprise more than seven secondary cells with configured uplinks; and
transmit one or more control commands based on the power headroom report.
2. The base station of claim 1 , wherein the power headroom report is identified by a subheader comprising a logical channel identifier field and a length field.
3. The base station of claim 1 , wherein a bit in the presence field indicates whether one or more power headroom fields are present for a corresponding secondary cell.
4. The base station of claim 1 , wherein a bit in the presence field indicates that no power headroom field is present for a corresponding secondary cell when the bit is set to zero.
5. The base station of claim 1 , wherein a bit in the presence field indicates that one or more power headroom fields are present for a corresponding secondary cell when the bit is set to one.
6. The base station of claim 1 , wherein the one or more secondary cells comprise a physical uplink control channel (PUCCH) secondary cell.
7. The base station of claim 1 , wherein the power headroom report comprises one or more Type 1 power headroom fields and one or more Type 2 power headroom fields.
8. A method comprising:
receiving, by a wireless device from a base station, at least one message comprising:
configuration parameters of one or more secondary cells; and
at least one information element indicating that a first type of extended power headroom is configured, wherein the at least one information element is configured as setup when a secondary cell in the one or more secondary cells is configured with a physical uplink control channel;
transmitting a power headroom report comprising a presence field, wherein:
the presence field is of a fixed size of one octet when up to seven secondary cells are configured in the wireless device, each cell in the one or more secondary cells having a cell index with a value between one and seven; and
the presence field is of a fixed size of four octets when the one or more secondary cells comprise more than seven secondary cells with configured uplinks; and
receiving, from the base station, one or more control commands based on the power headroom report.
9. The method of claim 8 , wherein the power headroom report is identified by a subheader comprising a logical channel identifier field and a length field.
10. The method of claim 8 , wherein a bit in the presence field indicates whether one or more power headroom fields are present for a corresponding secondary cell.
11. The method of claim 8 , wherein a bit in the presence field indicates that one or more power headroom fields are present for a corresponding secondary cell when the bit is set to one.
12. The method of claim 8 , wherein the one or more secondary cells comprise a physical uplink control channel (PUCCH) secondary cell.
13. The method of claim 8 , wherein the power headroom report comprises one or more Type 1 power headroom fields and one or more Type 2 power headroom fields.
14. 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 message comprising:
configuration parameters of one or more secondary cells; and
at least one information element indicating that a first type of extended power headroom is configured, wherein the at least one information element is configured as setup when a secondary cell in the one or more secondary cells is configured with a physical uplink control channel;
transmit a power headroom report comprising a presence field, wherein:
the presence field is of a fixed size of one octet when up to seven secondary cells are configured in the wireless device, each cell in the one or more secondary cells having a cell index with a value between one and seven; and
the presence field is of a fixed size of four octets when the one or more secondary cells comprise more than seven secondary cells with configured uplinks; and
receive, from the base station, one or more control commands based on the power headroom report.
15. The wireless device of claim 14 , wherein the power headroom report is identified by a subheader comprising a logical channel identifier field and a length field.
16. The wireless device of claim 14 , wherein a bit in the presence field indicates whether one or more power headroom fields are present for a corresponding secondary cell.
17. The wireless device of claim 14 , wherein a bit in the presence field indicates that one or more power headroom fields are present for a corresponding secondary cell when the bit is set to one.
18. The wireless device of claim 14 , wherein the one or more secondary cells comprise a physical uplink control channel (PUCCH) secondary cell.
19. The wireless device of claim 14 , wherein the power headroom report comprises one or more Type 1 power headroom fields and one or more Type 2 power headroom fields.
20. The wireless device of claim 14 , wherein a bit in the presence field indicates that no power headroom field is present for a corresponding secondary cell when the bit is set to zero.