Beam Failure Detection for Dormant Bandwidth Parts
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Solution Overview
Problem
Current beam failure detection methods in cellular communication networks, particularly in 5G NR, face challenges when dealing with dormant Bandwidth Parts (BWPs) as they lack efficient mechanisms for detecting beam failures, leading to increased recovery latency and inefficiencies.
Innovation Solution
The solution involves determining a beam failure detection reference signal configuration for dormant BWPs based on the configuration of active BWPs, allowing for implicit configuration assumptions and enabling beam failure detection without explicit configurations, thereby facilitating timely failure detection and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure detection is performed on dormant bandwidth parts using explicit configuration, then detection reliability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
Instead of configuring beam failure detection reference signals explicitly for dormant BWPs, the patent inverts the approach by determining the configuration implicitly from active BWPs. The UE derives the dormant BWP's BFD-RS configuration based on the active BWP's configuration, eliminating the need for separate explicit signaling while maintaining detection reliability.
Solution Approach 2:
The dormant BWP configuration serves itself by automatically inheriting parameters from the active BWP configuration. The UE autonomously determines the beam failure detection reference signal configuration for dormant BWPs using the active BWP's configuration as a basis, without requiring additional network signaling or manual configuration.
2Measurement precision
If beam failure detection reference signal configuration is explicitly provided for dormant bandwidth parts, then measurement precision is improved, but loss of time due to signaling overhead increases
Solution Approach 1:
The active BWP's beam failure detection reference signal configuration is prepared in advance and can be directly applied to dormant BWPs when needed. This preliminary configuration of the active BWP serves as a template that eliminates the need for time-consuming explicit signaling when dormant BWP configuration is required.
Solution Approach 2:
The patent uses copying by deriving the dormant BWP's BFD-RS configuration from the active BWP's configuration. The UE copies the essential parameters from the active BWP configuration to establish the dormant BWP configuration, significantly reducing signaling overhead and time while maintaining measurement precision.
3Use of energy by moving object
If dormant bandwidth parts are not actively monitored, then energy consumption is reduced, but beam failure detection capability deteriorates
Solution Approach 1:
The patent applies partial action by configuring beam failure detection for dormant BWPs only when necessary, rather than continuous monitoring. The UE determines the BFD-RS configuration implicitly and performs detection on demand, maintaining energy efficiency while ensuring detection capability when needed.
Data Source
AI summary
According to an example aspect of the present invention, there is provided a method comprising, determining a beam failure detection reference signal configuration for a dormant bandwidth part based on a beam failure detection reference signal configuration of another bandwidth part and performing beam failure detection on the dormant bandwidth part according to the determined beam failure detection reference signal configuration.