Beam Failure Detection With Candidate Cell Switching
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Solution Overview
Problem
Wireless communication systems face challenges in complex and dynamic environments where signal attenuation or blockage can hinder the ability of wireless devices to maintain connectivity with serving cells, necessitating enhanced beam failure detection and recovery procedures, especially when high-quality new beams are not available for reconnection.
Innovation Solution
The system enables wireless devices to monitor beam failure detection reference signals from both serving and non-serving cells, allowing for autonomous cell switching to connect with non-serving cells when high-quality beams are not available for the serving cell, and to report beam failures to the serving cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices monitor only serving cell beams, then device complexity is reduced, but reliability deteriorates when serving cell beams fail
Solution Approach 1:
The system pre-configures candidate cells and their beam failure detection reference signals before beam failure occurs. The wireless device is provided with information about candidate cells including their identification and BFD RS configurations, enabling immediate switching capability when serving cell beams fail, thus improving reliability without adding complex real-time decision-making
2Reliability
If wireless devices monitor BFD RS from multiple cells, then reliability improves through faster failure detection, but use of energy increases
Solution Approach 1:
The system implements differentiated monitoring where the wireless device monitors BFD RS from the serving cell continuously and from candidate cells based on configuration. The device can adjust monitoring behavior locally - full monitoring for configured candidate cells, selective monitoring for other cells - optimizing the balance between detection reliability and energy consumption
3Productivity
If wireless devices autonomously switch to non-serving cells, then productivity improves through faster recovery, but device complexity increases
Solution Approach 1:
The network pre-configures candidate cells and their parameters before beam failure occurs. The wireless device receives and stores information about candidate cells including cell identification, BFD RS configurations, and switching criteria. When beam failure is detected, the device can immediately execute the pre-planned switching procedure, achieving fast recovery without complex real-time decision algorithms
Data Source
AI summary
Disclosed are systems and techniques for wireless communications. For instance, a process may include receiving an indication to monitor one or more beam failure detection reference signals (BFD RSs) from a set of cells, wherein the set of cells includes a first candidate cell, monitoring the one or more BFD RSs from the set of cells, detecting a beam failure from a cell of the set of cells, transmitting a beam failure request (BFRQ) message including an indication of the beam failure, and stopping monitoring the cell based on the detected beam failure.