TPC Command Transmission for Multi-TRP Power Control
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Solution Overview
Problem
In wireless communications, particularly in NR Rel-16, there is a challenge in transmitting Transmission Power Control (TPC) commands for PUCCH resources targeting different TRPs, as existing methods do not efficiently support independent power control for each TRP.
Innovation Solution
The proposed method involves receiving and determining TPC commands for each PUCCH resource based on a higher layer index value configured for a CORESET, and transmitting each PUCCH resource using the power according to the determined TPC command. This is achieved by carrying multiple TPC commands in a single DCI with format 2_2, where each TPC command is associated with a specific higher layer index value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TPC commands are transmitted using separate DCI messages for each TRP, then independent power control for each TRP is achieved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent combines multiple TPC commands for different TRPs into a single DCI message format 2_2. The base station transmits aggregated TPC commands in one downlink control information message, reducing the number of separate DCI transmissions and simplifying the signaling structure while maintaining independent power control capability for each TRP.
Solution Approach 2:
Within the single DCI message, the TPC commands are segmented into distinct fields, each associated with a specific TRP through indexing mechanisms. The UE can identify and extract the appropriate TPC command for each TRP based on the segmented structure and associated indices, enabling independent power control without requiring separate DCI messages.
2Measurement precision
If separate DCI messages are used for TPC commands of different TRPs, then power control accuracy is improved, but transmission overhead increases
Solution Approach 1:
Multiple TPC commands that would traditionally require separate DCI messages are merged into a single DCI format 22 message. This consolidation reduces the quantity of downlink control information transmissions while preserving the accuracy of individual TPC commands through proper field segmentation and association within the unified message structure.
3Adaptability or versatility
If independent TPC commands are implemented for each TRP, then power control adaptability is improved, but system complexity increases
Solution Approach 1:
The DCI format 22 is designed with multi-functionality to serve multiple TRPs simultaneously. By incorporating configurable fields such as tpc-IndexPCell and tpc-IndexPUCCH-SCell, the single DCI message can adaptively provide independent TPC commands for different TRPs and different PUCCH resources, enhancing power control adaptability without requiring separate specialized DCI formats for each TRP.
Data Source
AI summary
Methods and apparatuses for transmission of power control command are disclosed. In one embodiment, a method at a UE comprises receiving two or more TPC commands for PUCCH resources of the UE in a cell, each PUCCH resource is associated with a higher layer index value configured for a CORESET, determining a TPC command for each PUCCH resource according to the higher layer index value; and transmitting each PUCCH resource using the power according to the determined TPC command.