Multi-TRP PUSCH Repetition for Reliable Uplink Reception
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Solution Overview
Problem
Current wireless communication methods in multi-TRP systems fail to utilize diversity of multi-transmission/reception points for improved uplink reliability and communication performance, particularly in non-ideal backhaul scenarios, as they only allow transmission to one TRP and lack effective coordination between TRPs.
Innovation Solution
Implementing a method and apparatus that schedule and indicate physical uplink shared channel (PUSCH) with one or more repetition transmissions, along with transmission configurations, to enhance multi-TRP reception and coordination, utilizing transmission configuration indicator (TCI) states and higher layer parameters for improved reliability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUSCH is transmitted to only one TRP using current single transmission configuration method, then the transmission method is simple and easy to implement, but the uplink reliability is insufficient and cannot utilize multi-TRP diversity
Solution Approach 1:
The patent segments the transmission configuration by introducing multiple Transmission Configuration Indicator (TCI) states, where each TCI state corresponds to a specific TRP. The UE is configured with multiple TCI states and selects appropriate ones for different PUSCH repetitions, enabling multi-TRP transmission while maintaining manageable configuration complexity through structured state management.
Solution Approach 2:
The patent implements dynamic switching between different TCI states for different PUSCH repetition transmissions. The gNB dynamically indicates which TCI state to use for each repetition through DCI signaling, allowing the system to adaptively select optimal TRPs based on current channel conditions while keeping the UE implementation straightforward through rule-based selection.
2Reliability
If multiple TCI states are configured for PUSCH repetition transmissions to enable multi-TRP reception, then uplink reliability is improved through diversity, but the configuration and coordination complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states at the UE before actual PUSCH transmission. The gNB provides RRC configuration of multiple TCI states with associated SRS resources and power control parameters in advance, so that during actual transmission, the UE can quickly select and apply the appropriate pre-configured state without complex real-time processing.
Solution Approach 2:
The patent implements self-service through automated TCI state selection and application. The UE autonomously selects the appropriate TCI state based on gNB indications and automatically applies the corresponding SRS resources, spatial relations, and power control parameters without requiring manual configuration or complex coordination procedures, simplifying the operation for both UE and gNB.
Data Source
AI summary
An apparatus and a method of wireless communication are provided. The method by a user equipment (UE) includes being scheduled with a physical uplink shared channel (PUSCH) with one or more repetition transmissions and being indicated with transmission configurations for the PUSCH with one or more repetition transmissions. This can solve issues in the prior art, utilize multi-transmission/reception point (TRP) reception, improve uplink reliability, provide a good communication performance, and/or provide high reliability.