UE CORESET Monitoring Rules for Overlapping PDCCH Collisions
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Solution Overview
Problem
In next-generation mobile communication systems, the control of collision of downlink control channels when a user equipment (UE) simultaneously receives multiple channels/signals of quasi-co-location (QCL) type D has not been adequately addressed, leading to potential throughput deterioration and communication quality degradation.
Innovation Solution
A terminal and base station are designed with a control section that determines a first control resource set (CORESET) to be preferentially monitored based on specific rules, and a receiving section that controls the monitoring of downlink control channels in other CORESETs based on their TCI states, ensuring appropriate handling of overlapping monitoring occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE monitors multiple CORESETs simultaneously, then the communication capacity and throughput are improved, but the collision of downlink control channels occurs leading to deterioration of communication quality
Solution Approach 1:
The patent changes the monitoring parameters by introducing TCI state-based filtering criteria. When TCI states of overlapping CORESETs differ, the UE filters out certain CORESETs from monitoring based on QCL type D relationships, thereby resolving the contradiction between monitoring multiple CORESETs for higher throughput and avoiding collisions that deteriorate communication quality.
2Adaptability or versatility
If the UE monitors all configured CORESETs without restriction, then the control channel coverage is improved, but the processing complexity and resource consumption increase
Solution Approach 1:
The patent introduces TCI state parameters as filtering criteria to reduce processing complexity. By comparing TCI states and applying QCL type D relationship checks, the UE selectively monitors only relevant CORESETs, thereby maintaining comprehensive control channel coverage while reducing unnecessary processing of overlapping control channels.
3Reliability
If the UE applies strict priority rules to avoid CORESET collision, then the communication reliability is improved, but the monitoring flexibility and adaptability deteriorate
Solution Approach 1:
The patent uses TCI state parameters and QCL type D relationship checks to create a flexible priority mechanism. Instead of rigid priority rules, the UE dynamically determines monitoring behavior based on TCI state comparisons, maintaining communication reliability through collision avoidance while preserving monitoring flexibility when TCI states indicate compatible relationships.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a control section that determines a first control resource set (CORESET) to be preferentially monitored out of a plurality of CORESETs, based on a rule; and a receiving section that, when monitoring occasions of the first CORESET having one or more transmission configuration indication states (TCI states) and a second CORESET having one or more TCI states overlap, controls monitoring of a downlink control channel (PDCCH) in the second CORESET, based on the one or more TCI states of the first CORESET and the one or more TCI states of the second CORESET. According to one aspect of the present disclosure, collision of a plurality of downlink control channels can be appropriately addressed.