Wireless Channel Status Indication for 5G Beam Failure Recovery
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Solution Overview
Problem
In 5G New Radio systems using high-frequency frequencies, beam failure occurs frequently due to pathloss, necessitating beam recovery, but existing methods lack efficient mechanisms for sharing channel status information, leading to degraded performance and signaling overhead.
Innovation Solution
A system and method for indicating wireless channel status after beam failure recovery, allowing UEs to determine reference signals for data or control channels, reducing signaling overhead by using assumed QCL relationships until TCI states are updated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to overcome high pathloss in 5G NR systems, then communication reliability is improved, but beam failure still occurs frequently due to pathloss requiring beam recovery
Solution Approach 1:
The system performs preliminary actions by pre-configuring multiple TCI states and reference signals before beam failure occurs. When beam failure is detected, the UE can immediately switch to a pre-configured alternative TCI state without waiting for new configuration, thus reducing recovery time while maintaining communication reliability
Solution Approach 2:
The system implements feedback mechanisms where the UE monitors beam quality and provides feedback on beam failure detection to the gNB. This enables rapid detection and response to beam failures, allowing the system to switch beams promptly while maintaining reliable communication through coordinated beam management
2Reliability
If channel status information is shared between participating devices to maximize beam performance, then beam performance is improved, but signaling overhead increases
Solution Approach 1:
The invention extracts and reuses existing TCI state configurations and reference signal information that are already available in the system for other purposes. By indicating channel status through existing TCI state indicators rather than separate signaling messages, the system achieves beam performance optimization without additional signaling overhead
Solution Approach 2:
The TCI state configurations are designed to serve multiple functions: they are used for beam management, channel status indication, and reference signal configuration simultaneously. This multi-functionality allows the system to share channel status information efficiently without dedicating separate signaling resources, thus improving beam performance while minimizing signaling overhead
Data Source
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AI summary
A method for operating a user equipment includes receiving a first frame on a first channel associated with a first beam identified during a beam failure recovery procedure, and determining that an assumed quasi-co-located relationship exists between the first channel and the first beam, and based thereon, decoding the first frame in accordance with a first reference signal on the first channel and using a first spatial domain receive filter that was used to decode the first beam.