Linked PDCCH Candidate Counting for Blind Detection Limits
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Solution Overview
Problem
Current NR systems face challenges in enhancing the reliability and robustness of Physical Downlink Control Channel (PDCCH) transmission, particularly in scenarios involving multiple TRPs with non-ideal backhaul, where existing counting schemes fail to align the understanding of PDCCH candidates between gNB and UE, leading to potential misalignment in blind detection complexity.
Innovation Solution
Implement enhanced counting schemes for PDCCH candidates that account for different decoding behaviors and linkage assumptions, ensuring aligned understanding between gNB and UE, by linking PDCCH candidates for multiple transmissions and defining candidate counting based on predefined time periods and decoding behaviors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs transmit PDCCH candidates with different counting schemes, then transmission reliability is improved through spatial diversity, but misalignment between gNB and UE understanding of candidate counting occurs
Solution Approach 1:
The patent applies parameter changes by modifying the candidate counting methodology to be consistent across multiple TRPs. Specifically, it defines that when PDCCH candidates are transmitted from multiple TRPs, the counting should be performed such that the total number of candidates across all TRPs does not exceed the maximum allowed candidates per slot or span. This parameter adjustment ensures that while spatial diversity is exploited for improved reliability, the counting parameters remain aligned between gNB and UE, preventing information loss about candidate limits.
2Adaptability or versatility
If PDCCH candidates from multiple TRPs are counted separately, then each TRP can independently optimize transmission, but the total number of candidates may exceed maximum limits per slot or span
Solution Approach 1:
The patent applies the merging principle by combining the candidate counting from multiple TRPs into a unified count. Instead of allowing each TRP to independently count and optimize candidates without coordination, the patent merges the candidate sets from all TRPs and ensures the combined total adheres to the maximum candidate limits. This approach maintains adaptability for multi-TRP transmission while managing complexity through a standardized counting rule that prevents exceeding system limits.
3Reliability
If enhanced PDCCH transmission uses multiple transmissions from same or different TRPs, then robustness is improved, but blind detection complexity increases at the UE
Solution Approach 1:
The patent applies dynamics by enabling flexible configuration of PDCCH candidate transmission across multiple TRPs while maintaining dynamic control over the total candidate count. The system can adaptively select which TRPs transmit candidates and how many candidates each TRP transmits, based on channel conditions and traffic requirements, while ensuring the total remains within acceptable limits for UE blind detection. This dynamic approach improves robustness through multiple transmissions while managing detection complexity through coordinated counting.
Data Source
AI summary
Methods and apparatus of enhanced counting schemes for candidates of enhanced PDCCH are disclosed. The method includes: counting, by a processor, candidates of PDCCH that are to be transmitted with a plurality of transmissions, based on a candidate counting scheme, wherein the candidates are linked with one another for transmissions of the PDCCH; generating, by the processor, configuration signaling of one or more search space sets for monitoring transmissions of the PDCCH; and transmitting, by a transmitter, the configuration signaling and the candidates of the PDCCH.