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 determining that an uplink resource for a new transmission on a serving cell of the multiple serving cells is allocated at a first time after the power headroom report is triggered. 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 a predetermined time before the start of the uplink resource at 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;
determining that an uplink resource for a new transmission on a serving cell of the plurality of serving cells is allocated at a first time after the power headroom report is triggered;
generating a power headroom report medium access control control element comprising at least a 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 resource for new transmission on the allocated first time;
wherein the power headroom value for each serving cell of the plurality of serving cells being activated is determined based on information received at a time prior to and including a second time in response to the uplink resource allocated at a first time being scheduled by an uplink grant received at a second time after the power headroom report is triggered; and
wherein the power headroom value for each serving cell of the plurality of serving cells being activated is determined based on information received prior to and including a predetermined time before a start of the uplink resource at the first time in response to the uplink resource for the new transmission allocated at the first time being a configured grant.
2. The method of claim 1 , wherein the information comprises downlink control information and higher layer signaling of configured grant and signaling for sounding reference signal transmissions.
3. The method of claim 2 , wherein the information comprises signaling for periodic and semi-persistent sounding reference signal transmissions.
4. The method of claim 1 , wherein the second time corresponds to a physical downlink control channel occasion.
5. The method of claim 4 , wherein the second time is earlier than the first time.
6. The method of claim 1 , wherein determining the power headroom value for each serving cell of the plurality of serving cells being activated 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 reference format.
7. The method of claim 1 , wherein the predetermined time is a user equipment processing time value for preparation of a physical uplink shared channel transmission.
8. The method of claim 1 , wherein the predetermined time is a fixed number of slots, a fixed number of orthogonal frequency-division multiplexing symbols, or some combination thereof before the start of the uplink resource at the first time.
9. The method of claim 1 , wherein the predetermined time is a physical downlink control channel occasion in which an uplink grant is received, and the uplink grant allocates uplink resources for the new transmission at the first time after the power headroom report is triggered.
10. The method of claim 1 , wherein the information comprises physical layer grants, higher layer signaling, or some combination thereof.
11. The method of claim 10 , wherein the physical layer grants comprise uplink related downlink control information formats.
12. An apparatus comprising:
a processor that:
aggregates a plurality of serving cells;
determines that a power headroom report is triggered;
determines that an uplink resource for a new transmission on a serving cell of the plurality of serving cells is allocated at a first time after the power headroom report is triggered; and
generates a power headroom report medium access control control element comprising at least a 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 resource for new transmission on the allocated first time;
wherein the power headroom value for each serving cell of the plurality of serving cells being activated is determined based on information received at a time prior to and including a second time in response to the uplink resource allocated at a first time being scheduled by an uplink grant received at a second time after the power headroom report is triggered; and
wherein the power headroom value for each serving cell of the plurality of serving cells being activated is determined based on information received prior to and including a predetermined time before a start of the uplink resource at the first time in response to the uplink resource for the new transmission allocated at the first time being a configured grant.
13. The apparatus of claim 12 , wherein the information comprises downlink control information and higher layer signaling of configured grant and signaling for sounding reference signal transmissions.
14. The apparatus of claim 13 , wherein the information comprises signaling for periodic and semi-persistent sounding reference signal transmissions.
15. The apparatus of claim 12 , wherein the second time corresponds to a physical downlink control channel occasion.
16. The apparatus of claim 15 , wherein the second time is earlier than the first time.
17. The apparatus of claim 12 , wherein the processor determining the power headroom value for each serving cell of the plurality of serving cells being activated comprises the processor 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 reference format.
18. The apparatus of claim 12 , wherein the predetermined time is a user equipment processing time value for preparation of a physical uplink shared channel transmission.
19. The apparatus of claim 12 , wherein the predetermined time is a fixed number of slots, a fixed number of orthogonal frequency-division multiplexing symbols, or some combination thereof before the start of the uplink resource at the first time.
20. The apparatus of claim 12 , wherein the predetermined time is a physical downlink control channel occasion in which an uplink grant is received, and the uplink grant allocates uplink resources for the new transmission at the first time after the power headroom report is triggered.