Enhanced PDCCH Candidate Counting for Multi-TRP Blind Detection Limits
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing enhanced Physical Downlink Control Channel (PDCCH) transmissions, particularly in scenarios involving multiple Transmit Receive Points (TRPs), where the complexity of channel estimation and blind detection exceed the capabilities of user equipment (UE), leading to suboptimal reliability and robustness.
Innovation Solution
Implementing enhanced counting schemes for PDCCH candidates that involve Time-Division Multiplexing (TDM) and Frequency-Division Multiplexing (FDM) of PDCCH transmissions, along with predefined time periods for candidate counting, to align decoding behaviors between gNB and UE, ensuring compliance with maximum blind detection limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDCCH transmissions are transmitted from multiple TRPs to improve reliability, then PDCCH transmission reliability is improved, but channel estimation complexity and blind detection complexity exceed UE capabilities
Solution Approach 1:
The patent segments the PDCCH transmission into multiple transmission occasions across different TRPs, where each TRP transmits a portion of the control channel information. This segmentation allows the UE to process transmissions from multiple sources while managing complexity through structured candidate counting schemes that limit the number of blind detections required.
Solution Approach 2:
The patent implements preliminary action by establishing predefined candidate counting schemes and linkage relationships between PDCCH candidates before actual transmission. The gNB configures the UE with specific counting rules that determine how candidates are counted and linked across multiple TRPs, allowing the UE to prepare its decoding strategy in advance and avoid excessive real-time complexity.
2Reliability
If multiple PDCCH transmissions are transmitted from multiple TRPs to improve robustness, then PDCCH transmission robustness is improved, but blind detection complexity exceeds UE capabilities
Solution Approach 1:
The patent merges multiple PDCCH transmissions from different TRPs into a unified candidate counting framework. By establishing linkage relationships between candidates from different TRPs and applying consistent counting schemes, the system combines the robustness benefits of multi-TRP transmission while preventing blind detection complexity from exceeding UE capabilities through coordinated candidate management.
Solution Approach 2:
The patent changes the parameter of candidate counting by introducing different counting schemes (e.g., counting 1 candidate in initial time period vs. 2 candidates in subsequent periods) and linkage configurations. These parameter changes allow flexible adaptation to different transmission scenarios while maintaining compliance with UE blind detection capabilities.
3Reliability
If enhanced counting schemes with predefined time periods are implemented, then candidate counting alignment between gNB and UE is achieved, but system complexity increases
Solution Approach 1:
The patent implements periodic action through predefined time periods in the candidate counting scheme, where different counting rules apply to initial versus subsequent time periods. This periodic structure provides a systematic framework for aligning candidate counting between gNB and UE across multiple transmission occasions, achieving reliability through consistent behavior while managing complexity through predictable, repeating patterns.
Data Source
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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.