Terminal PDCCH Collision Handling via TCI State Activation
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Solution Overview
Problem
In previous NR specifications, there is a restriction that prevents a UE from simultaneously receiving multiple downlink control channels of different QCL type D, which can lead to decreased throughput and degraded communication quality due to inappropriate transmission and reception restrictions.
Innovation Solution
A terminal is designed with a control section that determines and monitors downlink control channels from overlapping control resource sets based on activated transmission configuration indication states, allowing for the prioritization of channels to address collisions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE simultaneously receives multiple downlink control channels of different QCL type D, then throughput and communication quality are improved, but collision control becomes complex and reception reliability deteriorates without proper prioritization
Solution Approach 1:
The base station performs preliminary action by activating multiple TCI states for a CORESET before the UE receives downlink control channels. This pre-configuration enables the UE to know in advance which TCI states are available, allowing proper prioritization when collisions occur and ensuring reception reliability while enabling simultaneous reception of multiple channels
Solution Approach 2:
The system implements feedback through the activation of multiple TCI states, where the base station provides information about available TCI states to the UE. This feedback mechanism allows the UE to make informed decisions about which PDCCHs to monitor based on the activated TCI states, resolving the contradiction between improved throughput and maintained reception reliability
2Reliability
If a UE monitors all PDCCHs in overlapping CORESETs, then communication quality is improved, but device complexity and processing load increase
Solution Approach 1:
The invention applies local quality by associating different TCI states with different spatial locations or transmission configurations. The UE monitors PDCCHes based on locally activated TCI states for each CORESET, rather than uniformly monitoring all PDCCHes across all CORESETs. This localized approach improves communication quality for relevant transmissions while reducing unnecessary processing load
Solution Approach 2:
The system segments the monitoring of PDCCHes by dividing them into groups associated with different CORESETs and TCI states. The UE selectively monitors PDCCHes based on which TCI states are activated, segmenting the overall monitoring task into manageable portions corresponding to different spatial configurations, thereby reducing processing complexity while maintaining communication quality
3Reliability
If a restriction is defined to prevent collision of downlink control channels, then reception reliability is improved, but adaptability deteriorates due to inappropriate transmission and reception restrictions
Solution Approach 1:
The invention implements dynamics by allowing the base station to dynamically activate multiple TCI states for a CORESET through MAC CE signaling. This dynamic activation enables the system to adapt to different transmission scenarios and spatial configurations, providing both reliability through collision avoidance and adaptability through flexible TCI state management
Solution Approach 2:
The system achieves universality by designing the TCI state activation mechanism to handle multiple functions: it provides collision avoidance, enables simultaneous reception of multiple PDCCHes, supports different spatial configurations, and maintains backward compatibility with existing NR specifications. This multi-functional approach resolves the contradiction between reliability and adaptability
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a control section that determines a downlink control channel (Physical Downlink Control Channel (PDCCH)) to monitor from among PDCCHs in a plurality of control resource sets (CORESETs) overlapping in time, based on a CORESET having two transmission configuration indication states (TCI states) being activated; and a receiving section that monitors the determined PDCCH. According to one aspect of the present disclosure, it is possible to appropriately address collision of a plurality of downlink control channels.