Power headroom report generation
Apparatuses, methods, and systems are disclosed for power headroom report generation. One method includes aggregating multiple serving cells. The method includes determining that a power headroom report is triggered. The method includes receiving, at a first time after the power headroom report is triggered, a first uplink grant that allocates resources for a new transmission on a serving cell of the multiple serving cells. The method includes determining a power headroom value for each serving cell of the multiple serving cells being activated based on information received prior to and including the first time. The method includes generating a power headroom report medium access control control element including at least the power headroom value for each serving cell of the multiple serving cells being activated.
1. A method comprising:
aggregating a plurality of serving cells;
determining that a power headroom report is triggered;
receiving, at a first time after the power headroom report is triggered, a first uplink grant that allocates resources for a new transmission on a first serving cell of the plurality of serving cells;
determining a power headroom value for each serving cell of the plurality of serving cells being activated based on information received at a time prior to and including the first time;
generating a power headroom report medium access control control element comprising at least the power headroom value for each serving cell of the plurality of serving cells being activated; and
transmitting the power headroom report medium access control control element on the uplink resources allocated by the uplink grant received at the first time.
2. The method of claim 1 , wherein the information comprises uplink related downlink control information.
3. The method of claim 1 , wherein the information comprises an uplink resource allocation for a configured grant.
4. The method of claim 1 , wherein the first time corresponds to a physical downlink control channel occasion.
5. The method of claim 1 , wherein determining the power headroom value for each serving cell of the plurality of serving cells comprises determining whether the power headroom value for each serving cell of the plurality of serving cells being activated is based on a real uplink transmission or a virtual uplink transmission.
6. The method of claim 1 , wherein the power headroom report medium access control control element comprises an indicator corresponding to each serving cell of the plurality of serving cells being activated, and the indicator indicates whether the power headroom value for a corresponding serving cell is real or virtual.
7. The method of claim 1 , wherein the power headroom report comprises a power headroom corresponding to each serving cell of the plurality of serving cells being activated, and the power headroom for a corresponding serving cell is real or virtual.
8. The method of claim 1 , wherein the power headroom report is triggered in response to a timer expiring.
9. An apparatus comprising:
a processor that:
aggregates a plurality of serving cells; and
determines that a power headroom report is triggered;
a receiver that receives, at a first time after the power headroom report is triggered, a first uplink grant that allocates resources for a new transmission on a first serving cell of the plurality of serving cells, wherein:
the processor:
determines a power headroom value for each serving cell of the plurality of serving cells being activated based on information received at a time prior to and including the first time; and
generates a power headroom report medium access control control element comprising at least the power headroom value for each serving cell of the plurality of serving cells being activated; and
a transmitter that transmits the power headroom report medium access control control element on the uplink resources allocated by the uplink grant received at the first time.
10. The apparatus of claim 9 , wherein the processor ignores downlink control information allocating uplink resources received at a second time later than the first time for computation of the power headroom report.
11. The apparatus of claim 9 , wherein the processor determines whether the power headroom value for each serving cell of the plurality of serving cells being activated is based on a real uplink transmission or a virtual uplink transmission.
12. The apparatus of claim 11 , wherein the real uplink transmission comprises a transmission based on a received uplink grant.
13. The apparatus of claim 11 , wherein the virtual uplink transmission comprises a virtual transmission based on a reference format.
14. A method comprising:
receiving a power headroom report medium access control control element comprising a power headroom for each serving cell of a plurality of serving cells being activated, wherein the power headroom for a corresponding service cell is real or virtual, the power headroom report medium access control control element comprises an indicator corresponding to each serving cell of the plurality of serving cells being activated, and the indicator indicates via a field value whether the power headroom value for a corresponding serving cell is real or virtual.
15. The method of claim 14 , wherein the power headroom for a corresponding serving cell is real in response to a remote unit performing an uplink transmission according to an uplink grant on the corresponding serving cell.
16. The method of claim 14 , wherein the power headroom for a corresponding serving cell is virtual in response to a remote unit not performing an uplink transmission on the serving cell according to an uplink grant.
17. An apparatus comprising:
a receiver that receives a power headroom report medium access control control element comprising a power headroom for each serving cell of a plurality of serving cells being activated, wherein the power headroom for a corresponding service cell is real or virtual, the power headroom report medium access control control element comprises an indicator corresponding to each serving cell of the plurality of serving cells being activated, and the indicator indicates via a field value whether the power headroom value for a corresponding serving cell is real or virtual.
18. The apparatus of claim 17 , wherein the power headroom for a corresponding serving cell is real in response to a remote unit performing an uplink transmission according to an uplink grant on the corresponding serving cell.