Method and apparatus for selectively applying the power adjustment of a transmit power control command
摘要
說(shuō)明書(shū)
However, re-use of this mechanism for NR may be problematic, due to timeline flexibility in NR: where the grant-to-transmission gap timing, referred to as slot-offset k2, belongs to a predefined/default set or is semi-statically configured to the user equipment (UE) and whose actual value is dynamically indicated in the time domain allocation part of the UL grant DCI. Therefore, determining whether a transmission occurs in a certain time slot depends on the time instance when the UE receives the UL grants DCIs (for dynamically scheduled grants). Accordingly, requiring the UE to fully determine all scheduled transmissions at a certain slot implies a “relatively tighter timeline situation” that forces the UE to wait until the “l(fā)ast moment” to decide.
To avoid such relatively tighter timeline situations, it was agreed for 5G NR Rel-15 that the UE sets the “PHR cut-off time” as the first UL grant DCI (on any serving cell) following the PHR trigger that schedules a new/initial transmission, so that all overlapping UL transmissions on other cells that are scheduled until or before the PHR cut-off time report actual PHR, while all non-overlapping UL transmissions and all overlapping UL transmissions on other cells that are scheduled after the PHR cut-off time report virtual PHR, such as with respect to a reference format. This is captured in the following text from [TS 38.213].
Excerpt from TS 38.213 Section 7.7 for Power Headroom Report
A UE determines whether a power headroom report for an activated serving cell [11, TS 38.321] is based on an actual transmission or a reference format based on the downlink control information the UE received until and including the PDCCH monitoring occasion where the UE detects the first DCI format 0_0 or DCI format 0_1 scheduling an initial transmission of a transport block since a power headroom report was triggered.
