Flexible Duplex TCI Configuration via Target Identity
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Solution Overview
Problem
Existing wireless communication systems face complexity in managing interference during beamforming-based transmission, especially in flexible duplex mode scenarios where uplink and downlink transmissions occur simultaneously on different frequency bands, necessitating a redesign of unified and common Transmission Configuration Indication (TCI) approaches.
Innovation Solution
The method involves receiving and transmitting signals with demodulation reference signals (DMRS) that are quasi co-located with target reference signal resources, using a target identity to determine specific quasi co-location (QCL) relationships for different interference situations, allowing for flexible configuration of QCL relationships across multiple cells and carriers, and ensuring identical updates only when signals are in the same duplex mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If unified TCI and common TCI are used to reduce signaling overhead, then signaling efficiency is improved, but interference management becomes complex in flexible duplex mode
Solution Approach 1:
The patent segments the QCL relationship configuration by introducing separate target identities for downlink and uplink directions. When flexible duplex mode is detected, the system updates downlink QCL relationships using a first target identity and uplink QCL relationships using a second target identity, thereby segmenting the interference management process by transmission direction while maintaining unified TCI framework
Solution Approach 2:
The patent implements dynamic adaptation by detecting the flexible duplex mode status and dynamically switching between different target identity update approaches. The system dynamically determines whether to use unified target identity updates or direction-separated updates based on real-time transmission mode, making the interference management mechanism adaptive to changing system conditions
2Productivity
If flexible duplex mode is implemented with simultaneous uplink and downlink transmissions, then spectrum efficiency is improved, but interference environment becomes more complex
Solution Approach 1:
The patent applies local quality by configuring different QCL relationships for different transmission directions (uplink and downlink) when flexible duplex mode is active. Each direction receives customized QCL configuration based on its specific interference characteristics, allowing localized optimization of reference signal resources for each transmission type while maintaining overall system flexibility
Solution Approach 2:
The patent introduces target identity as an intermediary mechanism that mediates between the unified TCI framework and the differentiated interference management requirements. The target identity acts as a bridge, enabling the system to maintain unified configuration management while allowing direction-specific QCL relationship updates through the first and second target identities
Data Source
AI summary
The node receives a first information block, the first information block indicating a target identity; and receives or transmits a first signal in a first resource set, the first signal being QCL with a first target reference signal resource; the target identity is associated with K1 first-type reference signal resources, the K1 first-type reference signal resources being associated with a first cell; the first target reference signal resource is one of the K1 first-type reference signal resources; the first resource set belongs to the first cell; the first resource set is used to determine the first target reference signal resource from the K1 first-type reference signal resources. The present application improves the determination of TCI, and thus the transmission of beamforming with a spectrum configuration based on flexible duplex mode or variable link, hence the optimized system performance.