Multi-TRP PUSCH Repetition Control Using DCI Reference Signals
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Solution Overview
Problem
The challenge of controlling PUSCH repetition transmission in multi-TRP scenarios has not been fully addressed in existing NR specifications, leading to potential throughput reduction and communication quality degradation.
Innovation Solution
A terminal and base station implementation that includes a receiving section for configuring PUSCH transmissions based on downlink control information and determining reference signal indices for spatial relations and pathloss reference signals to manage PUSCH repetition across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUSCH repetition transmission is performed across multiple slots in multi-TRP environments, then communication reliability is improved, but system complexity increases due to lack of standardized control mechanisms
Solution Approach 1:
The patent applies parameter changes by introducing specific DCI fields (SRI field, TCI field, spatial relation indicator) to control PUSCH repetition transmission parameters. By changing the control signaling parameters and their interpretation rules, the system enables reliable multi-TRP PUSCH repetition while maintaining standardized control mechanisms, thus improving reliability without excessive system complexity
Solution Approach 2:
The patent segments the control mechanism into distinct components: DCI format 0_1/0_2 for scheduling, SRI fields for spatial relation indication, TCI fields for transmission configuration, and separate control for each PUSCH repetition. This segmentation allows independent optimization of each control element, enabling reliable multi-TRP operation while keeping the overall system manageable through modular control
2Measurement precision
If multiple reference signal indices are configured for PUSCH repetitions, then spatial relation control precision is improved, but control signaling overhead increases
Solution Approach 1:
The patent makes the DCI structure universal by using the same DCI format 0_1/02 for both single-TRP and multi-TRP scenarios. The SRI and TCI fields serve multiple functions: they indicate spatial relations for codebook-based transmission, transmission configuration for non-codebook-based transmission, and can be interpreted differently based on higher-layer configuration. This multi-functionality enables precise spatial relation control without proportionally increasing signaling overhead
Solution Approach 2:
The patent applies partial action by only introducing additional fields (SRI, TCI) when multi-TRP PUSCH repetition is actually configured through higher-layer parameters. For single-TRP scenarios, the standard DCI format without these additional fields is used. This selective approach provides precise spatial relation control when needed while avoiding unnecessary overhead in simpler scenarios
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives information related to configuration of transmission of a plurality of physical uplink shared channels (PUSCHs) based on one piece of downlink control information (DCI), and a control section that determines, out of a plurality of reference signal indices, one or more reference signal indices used for at least one of spatial relations and pathloss reference signals (PL-RSs) for the plurality of PUSCHs. According to one aspect of the present disclosure, it is possible to appropriately control PUSCH repetition transmission even when multiple TRPs are applied.