User Terminal Beam Failure Recovery via Reference Signal Segmentation
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Solution Overview
Problem
Future radio communication systems face challenges in performing effective Beam Failure Recovery (BFR) procedures, especially when using multiple transmission points, due to the complexity of coordinating non-coherent transmission DL signals and managing beam failures across multiple transmission reception points.
Innovation Solution
A user terminal is equipped with a receiving section for downlink control information and a reference signal for beam failure detection, allowing it to detect beam failures and initiate recovery procedures by scheduling downlink shared channels from multiple transmission/reception points, and a control section that manages beam switching and recovery based on Quasi-Co-Location relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery procedure is implemented for multiple transmission points, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The patent segments the beam failure recovery process by introducing separate detection reference signals and recovery reference signals for different transmission points. The detection reference signal is used to detect beam failure at each transmission point, while the recovery reference signal is used to identify candidate beams. This segmentation allows independent monitoring and recovery for each transmission point, improving reliability without requiring complete system redesign.
Solution Approach 2:
The patent implements preliminary action by pre-configuring multiple detection reference signals and recovery reference signals before beam failure occurs. The terminal is configured with reference signal resources from multiple transmission points in advance, including detection reference signals for monitoring and recovery reference signals for beam switching. When beam failure is detected, the terminal can immediately switch to a candidate beam without delay, improving communication reliability while keeping the system complexity manageable through pre-planned configurations.
2Productivity
If non-coherent transmission from multiple transmission points is used, then system throughput is improved, but beam failure detection difficulty increases
Solution Approach 1:
The patent implements feedback mechanisms where the terminal monitors detection reference signals from multiple transmission points and provides feedback on beam quality. The network configures detection reference signals that enable the terminal to measure and report beam quality metrics. This feedback loop allows the system to track beam performance from each transmission point independently, making beam failure detection easier even in non-coherent transmission scenarios where multiple transmission points operate semi-independently.
3Reliability
If beam switching procedure is implemented, then radio link failure is reduced, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring recovery reference signals and candidate beam information before beam failure occurs. The terminal is provided with multiple detection reference signals and recovery reference signals from different transmission points in advance. When beam failure is detected through monitoring, the terminal can immediately identify and switch to a candidate beam using the pre-configured recovery reference signals, significantly reducing beam switching time while maintaining radio link stability.
Data Source
AI summary
To appropriately perform a Beam Failure Recovery (BFR) procedure even when communication is performed by using a plurality of transmission reception points in a future radio communication system, one aspect of a user terminal according to the present disclosure includes: a receiving section that receives one or more pieces of downlink control information and a first reference signal for beam failure detection, the one or more pieces of downlink control information being used to schedule downlink shared channels transmitted from a plurality of transmission reception points; and a control section that detects a beam failure of a transmission reception point associated with the first reference signal.