Multi-TRP PDCCH Decoding for URLLC Reliability
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Solution Overview
Problem
Current communication systems, particularly in 5G NR, face challenges in providing robust and prompt signaling using multiple transmission and reception points, especially in scenarios requiring ultra-low latencies like URLLC, due to bottlenecks in data transmission when connections between user equipment (UE) and transmission and reception points (TRPs) are blocked.
Innovation Solution
The implementation of a user equipment (UE) with circuitry and transceiver capabilities that receive and decode multiple physical downlink control channels (PDCCHs) from multiple TRPs within a single transmission time interval (TTI), scheduling physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) transmissions/receptions across different TRPs, ensuring redundancy by scheduling the same data transmission on multiple TRPs and using same or different communication parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDCCHs are received and decoded from multiple TRPs within a single TTI, then scheduling flexibility and reliability are improved, but device complexity and processing burden increase
Solution Approach 1:
The patent segments the control channel reception by assigning different PDCCHs from different TRPs to schedule different PDSCHs or PUSCHs. Each PDCCH carries DCI for specific channel scheduling, dividing the overall transmission task into manageable segments handled by separate control channels, thereby improving reliability without overwhelming the UE with undifferentiated processing demands
Solution Approach 2:
The patent implements preliminary scheduling actions where PDCCHs are received and decoded in advance within the same TTI before actual data transmission. This preliminary control channel processing establishes scheduling decisions upfront, allowing the UE to prepare for subsequent PDSCH receptions or PUSCH transmissions, thereby improving transmission reliability through advance planning while organizing processing in a structured sequence
2Reliability
If same data is transmitted on multiple TRPs through scheduled PDSCH receptions, then transmission robustness is improved, but bandwidth and resource utilization efficiency deteriorate
Solution Approach 1:
The patent merges multiple PDCCH scheduling operations into a coordinated multi-TRP transmission framework where multiple control channels work together to schedule redundant data transmissions. By combining the scheduling functions of multiple PDCCHs to coordinate transmissions across different TRPs, the system achieves robustness through redundancy while maintaining organized resource allocation that prevents complete waste of bandwidth
Solution Approach 2:
The patent changes transmission parameters by scheduling the same data on multiple TRPs with potentially different modulation and coding schemes, time resources, or frequency resources. This parameter diversification across TRPs provides robustness against channel conditions while allowing the system to adapt resource allocation dynamically, balancing reliability improvements with reasonable bandwidth utilization
3Speed
If multiple PDCCHs are received within a single TTI, then scheduling responsiveness is improved, but processing time and computational load increase
Solution Approach 1:
The patent implements periodic action by receiving multiple PDCCHs within structured time intervals (TTI) according to predefined scheduling patterns. This periodic reception framework allows the UE to expect and process control channels at regular intervals, improving scheduling responsiveness through predictable timing while organizing computational load into manageable periodic cycles rather than continuous processing demands
Data Source
AI summary
The present disclosure relates to a mobile terminal, a system and respective methods. The user equipment receives plural PDCCHs from each of plural TRPs within a single TTI, and decodes plural DCIs respectively carried on the received plural PDCCHs from each of the plural TRPs. All of the decoded plural DCIs from each of the plural TRPs are respectively scheduling plural PDSCH receptions or plural PUSCH transmissions on different ones of the plural TRPs. And all of the plural PDSCH receptions or plural PUSCH transmission are scheduled such that one of the decoded plural DCIs from each of the plural TRPs is scheduling a same one PDSCH reception or a same one PUSCH transmission on a same one of the plural TRPs. The user equipment receives or transmits same data in the respectively scheduled plural PDSCH receptions from or PUSCH transmission to each of the plural TRPs.