Common-Beam Detection and Recovery for NR Beam Failures
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently detecting and recovering from beam failures in New Radio (NR) networks, leading to suboptimal performance and connectivity issues.
Innovation Solution
A method for beam failure detection and recovery is implemented by incrementing a beam failure detection instance counter based on the detection of beam failures and resetting it based on transmission configuration indicator states, followed by transmitting a beam failure recovery request when the counter exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure detection and recovery procedures are implemented in NR networks, then communication reliability is improved, but system complexity increases due to additional monitoring and recovery mechanisms
Solution Approach 1:
The system performs preliminary beam failure detection by monitoring downlink beam quality before complete communication failure occurs. The counter mechanism is pre-configured to track beam failures, enabling early recovery actions that prevent total connection loss and maintain communication reliability without requiring complex reactive measures.
Solution Approach 2:
The beam failure recovery mechanism implements feedback through uplink transmissions carrying recovery requests when beam failures are detected. The network receives these feedback signals and responds with recovery configurations, creating a closed-loop system that maintains reliability while managing complexity through structured interaction protocols.
2Loss of time
If beam failure detection threshold is set low for early detection, then connectivity disruption is reduced, but false detections increase leading to unnecessary recovery procedures
Solution Approach 1:
The system dynamically adjusts detection parameters including the counter threshold and evaluation window size based on channel conditions and traffic requirements. By changing these parameters adaptively, the system achieves early detection of actual beam failures while filtering out transient fluctuations that would cause false detections, thus balancing response time with detection accuracy.
Solution Approach 2:
The beam failure detection uses a counter mechanism that requires multiple failed measurements before triggering recovery, rather than reacting to single measurements. This partial action approach (requiring threshold exceedance) reduces false detections from transient issues while still enabling timely recovery for persistent beam failures, optimizing the balance between sensitivity and reliability.
Data Source
AI summary
A method may include incrementing, by a wireless device, a beam failure detection (BFD) instance counter based on detection of a first beam failure of a first reference signal (RS). The method may include resetting the BFD instance counter based on an indication of a transmission configuration indicator (TCI) state applicable for receptions of physical downlink channels, wherein the TCI state is associated with a second RS. The method may include transmitting a beam failure recovery request based on the BFD instance counter being greater than a threshold, wherein the BFD instance counter is incremented based on detection of a second beam failure of the second RS.