Rate Matching Mechanism for PDSCH in Multi-TRP 5G NR
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Solution Overview
Problem
Current rate matching mechanisms for Physical Downlink Shared Channel (PDSCH) scheduled by enhanced Physical Downlink Control Channel (ePDCCH) in 5G NR systems face challenges in efficiently utilizing resources across multiple transmitting-receiving identities, leading to suboptimal reliability and resource usage in multi-TRP scenarios.
Innovation Solution
The proposed solution involves a rate matching mechanism that determines resources not available for PDSCH by exploiting the linkage between Control Resource Sets (CORESETs), search space sets, and candidates, allowing for simultaneous rate matching across multiple CORESETs and search space sets during ePDCCH transmission, enhancing resource usage efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs are used for ePDCCH transmission to improve reliability, then transmission reliability is improved, but resource usage efficiency deteriorates due to suboptimal rate matching
Solution Approach 1:
The patent segments the rate matching process into multiple independent rate matching patterns, each associated with a specific TRP. This allows the receiver to independently determine unavailable resources for each TRP's PDCCH transmissions, preventing resource conflicts and improving overall resource usage efficiency while maintaining the reliability benefits of multi-TRP diversity.
Solution Approach 2:
The patent introduces dynamic rate matching patterns that can be adaptively selected based on the actual PDCCH transmission occasions. The receiver determines which rate matching pattern to apply based on the detected PDCCH candidates from different TRPs, enabling flexible and efficient resource utilization while maintaining reliable communication.
2Productivity
If rate matching is performed for each TRP independently to improve resource efficiency, then resource usage efficiency is improved, but system complexity increases
Solution Approach 1:
The patent defines a universal rate matching pattern structure that can be applied to multiple TRPs. Each rate matching pattern follows the same format and determination process, allowing the system to handle multiple TRPs using a unified approach rather than requiring separate complex mechanisms for each TRP, thus improving resource efficiency without proportionally increasing system complexity.
3Productivity
If multiple rate matching patterns are configured for multiple TRPs to improve resource allocation, then resource allocation efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent configures multiple rate matching patterns in advance through higher-layer signaling before PDCCH transmissions occur. This preliminary configuration allows the receiver to have all necessary rate matching information ready, eliminating the need for dynamic signaling during transmission and reducing overall signaling overhead while maintaining efficient resource allocation.
Solution Approach 2:
The receiver autonomously determines which rate matching pattern to apply based on the detected PDCCH candidates and their association with different TRPs. This self-service approach eliminates the need for additional downlink signaling to indicate which rate matching pattern should be used, reducing signaling overhead while maintaining optimal resource allocation.
Data Source
AI summary
Methods and apparatus of rate matching mechanism for PDSCH scheduled by enhanced PDCCH with multiple transmissions are disclosed. The method includes: receiving, by a receiver, configurations for a plurality of Control Resource Sets (CORESETs), configurations for a plurality of search space sets, configurations for a plurality of rate matching patterns in a plurality of rate matching pattern groups, and a Physical Downlink Control Channel (PDCCH) transmitted with a plurality of repetitions; wherein the plurality of repetitions of the PDCCH are transmitted on a plurality of candidates from a plurality of transmitting-receiving identities; and determining, by a processor, resources not available for Physical Downlink Shared Channel (PDSCH) based on a linkage between the CORESETs, the search space sets, or the candidates, for rate matching.