Multi-TRP PUSCH Resource Allocation With Configurable Gaps
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Solution Overview
Problem
Existing solutions in NR Rel-16 do not effectively support PUSCH repetition involving multiple Transmission/Reception Points (TRPs) without separate scheduling or activation, necessitating improvements in resource allocation and frequency hopping behavior.
Innovation Solution
The proposed solution involves signaling a gap between consecutive PUSCH transmission instances to different TRPs, either semi-statically or dynamically, and configuring frequency hopping and redundancy version shifts to facilitate multi-TRP transmission, with details provided in Time Domain Resource Allocation (TDRA) and Downlink Control Information (DCI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUSCH repetition is configured for multiple TRPs without separate scheduling, then resource allocation efficiency is improved, but transmission reliability deteriorates due to lack of proper gap configuration between TRP transmissions
Solution Approach 1:
The patent segments the PUSCH repetition transmission into multiple independent transmission instances, each targeting a specific TRP. By introducing configurable gaps between these segmented transmissions, the system allows proper switching and processing between different TRPs while maintaining efficient resource allocation. The gap configuration separates the transmission instances in time, enabling reliable multi-TRP operation without requiring separate scheduling.
2Reliability
If frequency hopping is enabled for PUSCH across multiple TRPs, then frequency diversity is improved, but resource allocation complexity increases due to multiple hopping configurations
Solution Approach 1:
The patent implements a universal frequency hopping configuration that can be applied across multiple TRPs. Instead of configuring separate frequency hopping parameters for each TRP, a single frequency hopping configuration is defined that serves all TRPs. This multi-functional approach enables frequency diversity across TRPs while avoiding the complexity of managing multiple independent frequency hopping configurations.
3Reliability
If separate scheduling is used for each TRP transmission, then transmission reliability is improved, but scheduling overhead increases
Solution Approach 1:
The patent merges multiple TRP transmission schedules into a single unified scheduling mechanism. By configuring PUSCH repetition with multi-TRP parameters in one scheduling operation, the system achieves reliable multi-TRP transmission without the overhead of separate scheduling for each TRP. The unified schedule includes gap configurations and TRP-specific parameters that enable reliable transmission across multiple points while reducing control signaling overhead.
Data Source
AI summary
Physical Uplink Shared Channel (PUSCH) resource allocation with multiple TRPs is provided. Embodiments described herein provide details to facilitate multi-Transmission/Reception Point (TRP) transmission on the PUSCH with respect to User Equipment (UE) implementation and application scenarios. A gap between consecutive PUSCH transmission instances toward different TRPs (e.g., transmission associated with different spatial transmission filters) can be signaled, either semi-statically or dynamically. In case of dynamic signaling, the gap may be configured in a Time Domain Resource Allocation (TDRA) table and indicated in Downlink Control Information (DCI). In case of semi-static signaling, it may be done by Radio Resource Control (RRC).