Multi-TCI CORESET QCL Prioritization for PDCCH Monitoring
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Solution Overview
Problem
User equipment (UE) in wireless communication systems face challenges in efficiently decoding multiple physical downlink control channel (PDCCH) candidates across overlapping control resource sets (CORESETs) due to the lack of clear prioritization rules for quasi-co-location (QCL) Type-D properties, leading to increased resource usage and blind decoding efforts.
Innovation Solution
The UE implements a prioritization rule-based approach to select a highest priority CORESET and associated QCL-Type-D properties, allowing it to monitor a reduced set of PDCCH candidates efficiently, even in scenarios with multiple overlapping CORESETs and simultaneous beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors all PDCCH candidates across multiple overlapping CORESETs without prioritization rules, then the UE ensures complete decoding coverage, but the UE experiences increased blind decoding efforts and resource consumption
Solution Approach 1:
The patent segments the PDCCH monitoring task by dividing multiple overlapping CORESETs into prioritized groups. The UE is configured to monitor PDCCH candidates in a first set of CORESETs with higher priority and optionally in a second set of CORESETs with lower priority. This segmentation allows the UE to focus decoding resources on the most important control information first, reducing overall blind decoding effort while maintaining reliable coverage for critical PDCCH candidates.
2Productivity
If the UE implements prioritization rules for QCL-Type-D properties, then the UE reduces the number of monitored PDCCH candidates and blind decodes, but the UE requires complex rule-based selection logic
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with prioritization rules and QCL-Type-D property associations before actual PDCCH monitoring occurs. The network side device (gNB) configures the UE with multiple TCI states and their corresponding QCL-Type-D properties in advance. During monitoring, the UE simply needs to apply the pre-established priority rules to select which CORESETs to monitor, rather than making complex real-time decisions. This reduces the computational complexity during the actual decoding process.
Solution Approach 2:
The patent utilizes parameter changes by dynamically selecting which QCL-Type-D properties to apply based on the configured priority levels. The UE changes its monitoring parameters (which CORESETs to monitor, which TCI states to use) based on the prioritization rules. When monitoring PDCCH candidates in higher priority CORESETs, the UE applies specific QCL-Type-D properties, and when monitoring lower priority CORESETs, the UE applies different QCL-Type-D properties. This parameter change approach allows efficient resource utilization while managing complexity through configuration rather than complex algorithms.
3Adaptability or versatility
If the UE supports multiple TCI states per CORESET as in 3GPP Release 17, then the UE prepares for future standards and enhances flexibility, but the UE increases the number of PDCCH candidates to monitor
Solution Approach 1:
The patent applies partial action by implementing prioritization that allows the UE to monitor only the most necessary PDCCH candidates. When multiple TCI states are configured for a CORESET, the patent enables the UE to monitor PDCCH candidates associated with higher priority TCI states while optionally excluding lower priority ones. This partial monitoring approach prepares the UE for future standards like 3GPP Release 17 that support multiple TCI states, while currently managing the monitoring load by focusing on the most critical TCI states first.
Data Source
AI summary
A method of wireless communication performed by a user equipment (UE) includes receiving a message indicating multiple control resource sets (CORESETs). Each CORESET of the multiple CORESETs comprising one or more quasi-co-location (QCL)-Type-D properties and associated with a respective physical downlink control (PDCCH) monitoring occasion of overlapping PDCCH monitoring occasions. One or more respective PDCCH candidates corresponding to the respective PDCCH monitoring occasion. The method also includes receiving, on one or more component carriers (CCs) operating on a same band, simultaneous beams comprising multiple PDCCH candidates. The method further includes monitoring a set of PDCCH candidates of the plurality of PDCCH candidates comprising a first CORESET of the multiple CORESETs comprising a first QCL-Type-D property, a second CORESET of the multiple CORESETs associated with a second QCL-Type-D property, and a set of monitoring CORESETs of the multiple CORESETs. Each of the monitoring CORESET associated with one or both of the first QCL-Type-D property or the second QCL-Type-D property based on a number of QCL-Type-D properties of a respective monitoring CORESET. In some examples, the first CORESET is a highest priority CORESET based on a set of priority rules.