Uplink Power Control for Multi-TRP PUSCH Repetitions
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Solution Overview
Problem
Existing technologies face challenges in ensuring ultra-reliable low-latency communication (URLLC) services by maintaining transmission reliability due to varying distances and channel conditions between terminal devices and transmission/reception points (TRPs), which affects the performance and reliability of physical uplink shared channel (PUSCH) repetitions.
Innovation Solution
Implementing an uplink power control method where a terminal device sends multiple PUSCH repetitions to different TRPs using distinct power control parameters based on separate precoding information, reducing signaling overheads by indicating power control parameters through flexible or predefined rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device sends PUSCH repetitions to different TRPs, then the transmission reliability of URLLC services is improved, but the signaling overhead increases due to the need to indicate different power control parameters for each TRP
Solution Approach 1:
The patent applies local quality by configuring different power control parameters (P0, alpha, path loss reference signals) for different TRPs based on their specific channel conditions. Each TRP receives tailored power control settings that match its local propagation characteristics, distances, and antenna configurations, thereby optimizing transmission reliability for each link while managing signaling overhead through selective configuration.
Solution Approach 2:
The patent segments the power control parameter configuration by creating separate parameter sets for different TRPs. The network device configures multiple groups of power control parameters, each associated with a specific TRP, allowing independent optimization of power control for each transmission point without requiring a single unified configuration that would increase overall signaling overhead.
2Reliability
If different power control parameters are used for different PUSCH repetitions, then the performance of PUSCH repetitions is improved, but the device complexity increases due to managing multiple parameter sets
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple groups of power control parameters through higher-layer signaling (RRC configuration) before PUSCH transmission begins. The network device provides the terminal with a set of pre-defined parameter groups, each associated with a specific TRP, so that during actual transmission, the terminal can directly select and apply the appropriate pre-configured parameters without real-time calculation or complex dynamic adjustment.
Solution Approach 2:
The patent uses an intermediary mechanism where the network device acts as a mediator to manage and distribute the appropriate power control parameter groups to the terminal. The network device monitors channel conditions, determines which TRP should receive PUSCH repetitions, and signals the corresponding parameter group index to the terminal, thereby simplifying terminal-side complexity while maintaining optimized power control performance.
Data Source
AI summary
A terminal device receives first indication information indicating first precoding information and second precoding information. The terminal device determines a first group of power control parameters corresponding to the first precoding information and determines a second group of power control parameters corresponding to the second precoding information. The terminal device determines first transmit power based on the first group of power control parameters and sends a first PUSCH repetition based on the first transmit power and the first precoding information, and determines second transmit power based on the second group of power control parameters and sends a second PUSCH repetition based on the second transmit power and the second precoding information.