Multi-TRP PUSCH Repetition for Uplink Reliability
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Solution Overview
Problem
Current 3GPP specifications limit physical uplink shared channel (PUSCH) repetition to a single transmission-reception point (TRP), which is unreliable when blockage occurs, especially in Frequency Range 2 (FR2), and does not leverage macro diversity across multiple TRPs.
Innovation Solution
Implementing multi-TRP based PUSCH repetition techniques, including enhancements for channel state information (CSI), beam switching gaps, configured grant (CG) mechanisms, uplink power control, and phase tracking reference signal (PTRS)-demodulation reference signal (DMRS) association to enable reliable PUSCH transmission across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-TRP based PUSCH repetition is used, then current 3GPP specification compliance is maintained, but system reliability deteriorates under blockage conditions
Solution Approach 1:
The patent implements dynamic switching between single-TRP and multi-TRP PUSCH repetition modes based on channel conditions. The gNB can dynamically select the appropriate transmission mode (single-TRP or multi-TRP) depending on blockage detection and channel quality, allowing the system to adapt to varying operational environments while maintaining specification compliance and reliability.
Solution Approach 2:
The patent segments the PUSCH transmission into multiple independent repetitions that can be directed to different TRPs. Each repetition can be independently configured with different TRPs, allowing the system to divide the transmission task across multiple reception points to overcome blockage and improve overall reliability.
2Reliability
If multi-TRP based PDSCH repetition is adopted, then macro diversity benefit is achieved, but PUSCH repetition support is insufficient
Solution Approach 1:
The patent makes the PUSCH repetition mechanism universal by enabling it to operate in both single-TRP and multi-TRP modes. The same PUSCH repetition framework can serve different transmission scenarios, and the gNB can configure the UE to use single-TRP or multi-TRP repetition based on the specific operational requirements, thereby reducing overall system complexity.
Solution Approach 2:
The patent incorporates feedback mechanisms where the gNB monitors channel conditions and provides feedback to the UE about which TRPs are available and suitable for PUSCH transmission. This feedback enables the UE to adjust its transmission strategy dynamically, reducing the complexity of manual configuration while maintaining robustness.
3Reliability
If multi-TRP PUSCH repetition is implemented, then transmission robustness is improved, but specification compliance becomes challenging
Solution Approach 1:
The patent implements dynamic mode switching that allows the system to operate in single-TRP mode for specification compliance in standard scenarios, and switch to multi-TRP mode only when needed for enhanced robustness. This dynamic approach maintains backward compatibility with existing 3GPP specifications while enabling advanced functionality when required.
Data Source
AI summary
Various embodiments herein provide techniques for physical uplink shared channel (PUSCH) transmission with repetitions to multiple transmission-reception points (TRPs). For example, embodiments include enhancement of channel state information (CSI) (e.g., aperiodic CSI (A-CSI) and/or semi-persistent CSI (SP-CSI)), configured grant (CG)-PUSCH, uplink power control (ULPC), beam switching gap, and phase tracking reference signal (PTRS)-demodulation reference signal (DMRS) association, among other issues for multi-TRP PUSCH repetition. Other embodiments may be described and claimed.