Flexible PDCCH Decoding for Multi-TRP Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and NR technologies, face challenges in efficiently managing multiple PDCCH candidates across different CORESETS with varying TCI states, leading to increased decoding complexity and potential errors.
Innovation Solution
A method and apparatus for wireless communication that allow a user equipment (UE) and a base station to selectively perform independent or joint decoding of PDCCH candidates based on configuration, where PDCCH candidates are indicated across different CORESETS with distinct TCI states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If joint decoding is performed for PDCCH candidates across multiple CORESETS with different TCI states, then reliability is improved through diversity gain, but device complexity increases due to higher decoding overhead
Solution Approach 1:
The patent implements dynamic switching between joint decoding and independent decoding modes based on configuration parameters and channel conditions. The UE can adaptively select the decoding approach, transitioning from static to dynamic operation to balance reliability and complexity requirements
Solution Approach 2:
The patent changes the decoding parameter (joint vs independent) based on configured thresholds and channel quality metrics. When channel conditions deteriorate or configuration indicates higher reliability needs, joint decoding is selected; otherwise independent decoding is used, thereby adjusting system behavior through parameter changes
2Device complexity
If independent decoding is performed for each PDCCH candidate, then device complexity is reduced, but reliability deteriorates due to loss of diversity gain
Solution Approach 1:
The system dynamically selects between independent and joint decoding based on real-time channel conditions and configuration. When channel quality is good and reliability requirements are met, independent decoding reduces complexity; when conditions deteriorate, the system switches to joint decoding to maintain reliability
Solution Approach 2:
The decoding mode parameter is adjusted based on channel quality indicators and configuration thresholds. The system changes from independent to joint decoding when reliability metrics fall below thresholds, thereby using parameter changes to balance complexity and reliability
3Adaptability or versatility
If multiple PDCCH candidates are monitored across different CORESETS, then adaptability is improved for multi-TRP operations, but difficulty of detecting and measuring increases due to blind decoding overhead
Solution Approach 1:
The patent segments the monitoring approach by dividing PDCCH candidates into different CORESET groups associated with different TRPs. Each CORESET is configured with specific TCI states, allowing the UE to monitor multiple candidates without treating them as a single monolithic set, thereby reducing detection difficulty through segmentation
Solution Approach 2:
The patent implements dynamic adaptation of monitoring behavior based on detected channel conditions and decoding success rates. The UE can adjust the number of blind decoding attempts and switch between monitoring strategies to balance adaptability for multi-TRP operations with manageable detection overhead
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive an indication of a set of corresponding physical downlink control channel (PDCCH) candidates that includes at least a first PDCCH candidate included in a first control resource set (CORESET) and a corresponding second PDCCH candidate included in a second CORESET, wherein the first CORESET and the second CORESET have different transmission configuration indication (TCI) states; and selectively perform, based at least in part on a configuration, at least one of: independent decoding of the first PDCCH candidate, independent decoding of the second PDCCH candidate, or joint decoding of the first PDCCH candidate and the second PDCCH candidate. Numerous other aspects are provided.