State Transition Feedback for Wireless Link Quality
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently managing link quality transitions between transmission modes, leading to inefficiencies in sidelink communication, especially in industrial IoT applications where latency and reliability are critical.
Innovation Solution
A method where user equipment (UE) and base stations measure reference signals to determine link quality and transmit feedback for state transitions between transmission modes, enabling seamless switching between single TRP, multi-TRP, sidelink, and Uu operations based on CSI feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system uses fixed transmission modes, then device complexity is reduced, but adaptability to varying link quality deteriorates
Solution Approach 1:
The patent implements dynamic transmission mode switching where the system transitions from fixed to adaptive transmission modes based on real-time link quality measurements. The UE measures reference signals from serving TRP and compares against thresholds to dynamically select between single-TRP and multi-TRP modes, enabling the system to adapt to varying channel conditions while maintaining manageable complexity through standardized measurement and reporting procedures.
2Adaptability or versatility
If the system implements dynamic transmission mode switching, then adaptability to link quality improves, but signaling overhead increases
Solution Approach 1:
The patent utilizes parameter-based transmission mode indication where the UE reports link quality metrics (such as RSRP, CSI) and the gNB determines mode transitions based on predefined thresholds. The signaling includes mode indication fields, threshold parameters, and link quality measurements, allowing the system to achieve adaptability while controlling overhead through efficient parameter encoding and threshold-based decision logic rather than extensive explicit signaling.
3Reliability
If the system uses single TRP transmission, then device complexity is reduced, but communication reliability deteriorates in poor link conditions
Solution Approach 1:
The patent segments the transmission function across multiple TRPs, where each TRP can independently serve the UE. When link quality to the serving TRP falls below thresholds, the system activates additional TRPs for diversified transmission paths. This segmentation provides spatial diversity and improves reliability in poor link conditions while maintaining the option to use single-TRP mode when conditions are good, thus balancing complexity and reliability.
4Measurement precision
If the system implements frequent link quality measurements, then transmission mode switching accuracy improves, but energy consumption increases
Solution Approach 1:
The patent implements periodic link quality measurements at configured intervals rather than continuous monitoring. The gNB configures measurement periods and triggers for the UE to measure reference signals from serving and non-serving TRPs. This periodic measurement approach maintains sufficient measurement precision for accurate mode switching decisions while significantly reducing energy consumption compared to continuous measurement, especially during stable link conditions where frequent updates are unnecessary.
Data Source
AI summary
Method and apparatus for signaling enabling a state transition of a transmission mode. The apparatus measures at least one reference signal from a serving TRP to determine a link quality between the UE and the serving TRP. The apparatus transmits feedback including a state transition indication if the link quality between the UE and the serving TRP falls below a threshold. The feedback enables a state transition of a transmission mode.