Method and apparatus for multi-transmission/reception point power headroom reporting in a wireless communication system
地域：
Taipei
摘要
A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives an uplink (UL) grant. The UL grant is indicative of a first Physical Uplink Shared Channel (PUSCH) transmission on a first Transmission/Reception Point (TRP) of a first cell. The UL grant is not indicative of a PUSCH transmission on a second TRP of the first cell. The UE transmits a Power Headroom Reporting (PHR) Medium Access Control (MAC) Control Element (CE). Based on the UL grant, the PHR MAC CE is indicative of a first power headroom (PH), associated with the first TRP, based on a real PUSCH transmission, and is indicative of a second PH, associated with the second TRP, based on a reference PUSCH transmission.
說明書
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The Power Headroom reporting procedure is used to provide the serving gNB with the following information:
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- Type 1 power headroom: the difference between the nominal UE maximum transmit power and the estimated power for UL-SCH transmission per activated Serving Cell;
- Type 2 power headroom: the difference between the nominal UE maximum transmit power and the estimated power for UL-SCH and PUCCH transmission on SpCell of the other MAC entity (i.e. S-UTRA MAC entity in EN-DC, NE-DC, and NGEN-DC cases);
- Type 3 power headroom: the difference between the nominal UE maximum transmit power and the estimated power for SRS transmission per activated Serving Cell;
- MPE P-MPR: the power backoff applied by the UE to meet the MPE FR2 requirements for a Serving Cell. [ . . . ]
A Power Headroom Report (PHR) shall be triggered if any of the following events occur:
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