Beam Failure Detection in 5G DRX Terminals
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Solution Overview
Problem
There is a need to reduce the delay in beam failure detection in wireless communication systems, particularly in 5G NR technology, especially when discontinuous reception (DRX) or connected-DRX (C-DRX) is configured in a terminal in a connected state.
Innovation Solution
A method is proposed that involves receiving DRX configuration information from a base station, performing beam failure detection (BFD) in resources configured by the base station, identifying whether a preconfigured condition is satisfied, and executing fast BFD by transferring the BFD execution result without considering the DRX cycle when the condition is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If discontinuous reception (DRX) is configured in a terminal to save power, then power consumption is reduced, but beam failure detection delay increases
Solution Approach 1:
The patent applies dynamics by making the beam failure detection mechanism adaptable to DRX configurations. The terminal dynamically adjusts its detection behavior based on whether DRX is active, switching between normal periodic detection (when DRX is active) and continuous detection (when DRX is inactive or for high-priority beams). This dynamic adaptation resolves the contradiction by allowing power savings during normal operation while enabling rapid detection when needed.
Solution Approach 2:
The patent changes the detection parameter (detection continuity) based on system state. When DRX is configured, the terminal normally follows the DRX cycle for power saving. However, when beam failure detection is triggered or for specific high-priority beams, the terminal changes the detection parameter to continuous monitoring, bypassing the DRX cycle. This parameter change allows the system to switch between power-efficient mode and rapid detection mode as needed.
2Speed
If continuous beam failure detection is performed to reduce detection delay, then detection speed improves, but power consumption increases
Solution Approach 1:
The patent segments the beam failure detection process into different modes: normal periodic detection aligned with DRX cycles and fast continuous detection. The terminal performs periodic detection during DRX off periods to conserve power, and switches to continuous detection only when necessary (e.g., when triggered by network indication or for high-priority beams). This segmentation allows the system to maintain low power consumption while being capable of rapid detection when required.
Solution Approach 2:
The patent uses periodic action by aligning beam failure detection with DRX cycles during normal operation. The terminal performs detection at periodic intervals corresponding to DRX on-durations rather than continuously. This periodic approach significantly reduces power consumption compared to continuous detection, while still providing adequate monitoring for most scenarios. Fast continuous detection is reserved for exceptional cases.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. According to the disclosure, a terminal reduces the delay required in beam failure detection, and thus recovery can be quick from when beam failure occurs.