Multi-TRP PUSCH Repetition PHR Reporting With Parameter Selection
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Solution Overview
Problem
In wireless communication systems, particularly in multi-TRP (transmit receive point) configurations, the ambiguity in determining power headroom (PHR) values for uplink shared channel repetitions due to different power control parameters in each repetition leads to inaccurate reporting, increased battery usage, and interference.
Innovation Solution
The solution involves specifying which repetition is used to determine the PHR value by configuring the UE to select a repetition based on a set of power control parameters, and transmitting information indicating the selected repetition to reduce ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE determines PHR value based on PUSCH transmission with multiple repetitions having different power control parameters, then the system can support multi-TRP configurations, but ambiguity arises in determining which repetition's parameters to use
Solution Approach 1:
The patent introduces a power control parameter set indicator as an intermediary element that explicitly identifies which power control parameter set should be used for PHR determination. This indicator acts as a mediator between the multiple repetitions and the PHR calculation process, resolving the ambiguity by providing a clear reference to the selected parameter set without requiring the base station to infer from multiple possibilities.
Solution Approach 2:
The patent changes the parameter space by adding a new dimension - the power control parameter set indicator - that distinguishes between different power control parameter sets. This parameter change transforms the ambiguous situation into a clear identification problem, where the indicator explicitly specifies which parameter set (first or second) should be used for PHR calculation, eliminating the ambiguity while maintaining multi-TRP configuration support.
2Device complexity
If the UE reports PHR value without specifying which repetition is used, then the reporting process is simpler, but the base station cannot accurately determine the corresponding power control parameters
Solution Approach 1:
The power control parameter set indicator serves as an intermediary that bridges the PHR value and the corresponding power control parameters. By including this indicator in the PHR reporting, the UE provides the base station with the necessary information to accurately identify which power control parameter set was used, ensuring measurement precision without significantly increasing reporting complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the UE includes information about the selected power control parameter set in the PHR report. This feedback allows the base station to accurately determine which parameters correspond to the reported PHR value, ensuring precise measurement and interpretation while maintaining a relatively simple reporting structure.
3Reliability
If the UE transmits PHR information for all repetitions, then the base station has complete information, but the transmission overhead increases
Solution Approach 1:
The patent extracts only the essential information needed for PHR determination - specifically, the power control parameter set indicator - rather than transmitting complete PHR information for all repetitions. This extraction approach provides the base station with sufficient information to accurately determine the relevant parameters while significantly reducing the quantity of transmitted data and associated overhead.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary PHR information for the selected repetition rather than all repetitions. The power control parameter set indicator provides just enough information for the base station to accurately identify the correct parameters, avoiding excessive transmission of redundant PHR data for repetitions that are not used for PHR determination.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a power headroom (PHR) value for a component carrier (CC) based at least in part on a physical uplink shared channel (PUSCH) transmission in the CC, wherein the PUSCH transmission includes a first repetition associated with a first set of power control parameters and a second repetition associated with a second set of power control parameters, and wherein the PHR value is determined based at least in part on one or more of the first repetition or the second repetition. The UE may transmit information identifying the PHR value for the CC. Numerous other aspects are provided.