PDCCH Candidate Counting for Multi-TRP Blind Detection Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current NR systems face challenges in enhancing the reliability and robustness of Physical Downlink Control Channel (PDCCH) transmission, particularly when multiple TRPs are involved, as existing methods do not effectively align candidate counting schemes between the gNB and UE, leading to potential misalignment in blind detection complexity and decoding behaviors.
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 defining candidate counting based on polar decoding times and transmission patterns such as TDM and FDM, and allowing flexible or explicit linkage of candidates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs are used for PDCCH transmission to improve reliability, then transmission robustness is improved, but blind detection complexity increases due to misaligned candidate counting schemes
Solution Approach 1:
The patent changes the counting parameter definition by introducing a new candidate counting scheme that counts PDCCH candidates based on polar decoding times rather than traditional candidate indices. This parameter change aligns the counting methodology between gNB and UE, resolving the complexity issue while maintaining multi-TRP reliability benefits
Solution Approach 2:
The patent introduces dynamic linkage assumptions where candidates can be explicitly linked or implicitly unlinked between TRPs. This dynamic approach allows the system to adapt the counting behavior based on whether candidates are transmitted from the same or different TRPs, optimizing both reliability and detection complexity
2Stability of the object's composition
If candidate counting schemes are aligned between gNB and UE, then decoding behavior consistency is improved, but system complexity increases due to additional configuration signaling
Solution Approach 1:
The patent applies homogeneity by using the same candidate counting scheme (based on polar decoding times) at both gNB and UE sides. This unified approach ensures consistent decoding behavior without requiring complex asymmetric configuration, as both sides follow identical counting rules
Solution Approach 2:
The system uses self-service by deriving candidate linkage information from existing transmission configurations rather than requiring explicit signaling. The UE can determine linkage relationships based on its own reception patterns and the configured search space structures, reducing signaling overhead
3Reliability
If explicit linkage of candidates is defined, then transmission reliability is improved, but processing overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-defining linkage relationships through search space set configurations. The gNB and UE establish candidate linkage patterns in advance through RRC signaling, so that during actual PDCCH transmission, the UE can quickly determine relationships without real-time processing overhead
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.