Sidelink Beam Failure Recovery via Discovery Messages
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Solution Overview
Problem
Current wireless communication systems lack effective solutions for beam failure monitoring and recovery in sidelink communications, particularly in frequency range 2 (FR2) where multi-beam operations are supported, and there is no Random Access Channel (RACH) available.
Innovation Solution
A method and device for operating a sidelink communication device that supports multi-beam operations, involving determining information associated with a wireless connection, detecting beam failure based on this information, and performing beam failure recovery by triggering sidelink discovery of a new sidelink communication device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure detection is implemented in sidelink communications without RACH, then beam failure recovery capability is improved, but device complexity increases due to need for alternative recovery mechanisms
Solution Approach 1:
The patent introduces a sidelink discovery message as an intermediary mechanism to enable beam failure recovery without RACH. The discovery message serves as a mediator that carries beam failure recovery information between UEs, allowing the recovery process to proceed through sidelink communication rather than requiring uplink RACH resources.
Solution Approach 2:
The patent enables UEs to autonomously perform beam failure detection and trigger discovery procedures for self-recovery. The UE monitors beam failure instances, determines when beam failure occurs, and independently initiates the discovery message transmission to recover the connection, without requiring network intervention or RACH resources.
2Reliability
If multi-beam operations are supported in FR2 sidelink, then communication reliability is improved, but connection interruption time increases during beam failure events
Solution Approach 1:
The patent implements preliminary beam failure detection by monitoring beam failure instances and maintaining a counter. The UE proactively detects beam failure conditions before complete connection loss occurs, allowing early initiation of recovery procedures through discovery messages, thereby reducing overall connection interruption time.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors beam quality metrics, counts beam failure instances, and uses this feedback information to trigger recovery actions. The feedback loop enables the system to respond dynamically to beam conditions, maintaining reliability while minimizing interruption time through timely recovery initiation.
3Reliability
If beam failure monitoring is implemented in sidelink, then connection reliability is improved, but measurement and detection difficulty increases
Solution Approach 1:
The patent replaces complex physical beam measurement mechanisms with a simplified counter-based detection system. Instead of requiring detailed analysis of beam quality parameters, the system uses beam failure instance indications from lower layers to increment a counter, making the detection process more straightforward and easier to implement while maintaining reliability.
Data Source
AI summary
According to an aspect, there is provided a method of operating a first sidelink communication device of a communications network. The first sidelink communication device is configured to support multi-beam operations. The method includes determining information associated with a wireless connection between the first sidelink communication device and a second sidelink communication device of the communications network; detecting beam failure associated with a beam associated with the wireless connection based on the information; and performing beam failure recovery by triggering sidelink discovery of a new sidelink communication device.