Radio Link Monitoring BWP Switching Accuracy
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Solution Overview
Problem
In 5G systems, when a terminal device switches from one bandwidth part (BWP) to another, the measurement results from the initial BWP cannot accurately reflect the radio link status in the new BWP, leading to reduced accuracy of radio link monitoring (RLM) and affected communication quality.
Innovation Solution
The terminal device removes the measurement results obtained from the previous BWP before performing RLM in the new BWP, or continues to use these results based on indication from the network device, to ensure accurate RLM in the switched BWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device continues to use measurement results from the previous BWP after switching to a new BWP, then the RLM process maintains continuity and device complexity is reduced, but the measurement results cannot accurately reflect the radio link status in the new BWP, reducing measurement precision
Solution Approach 1:
The patent implements dynamic selection of measurement results based on BWP switching status. The terminal device determines whether to use historical measurement results or perform new measurements based on whether a BWP switch has occurred, allowing the RLM process to adapt its behavior to current operating conditions rather than following a fixed approach
Solution Approach 2:
The patent changes the parameter of measurement result validity based on BWP switching events. When BWP switching occurs, the measurement results from the previous BWP are invalidated, and new measurement results must be obtained in the current BWP, ensuring measurement precision while maintaining clear parameter transition rules
2Measurement precision
If the terminal device performs new RLM measurements in the new BWP after switching, then measurement precision is improved, but this increases the time required for RLM and reduces productivity
Solution Approach 1:
The patent applies partial action by selectively using historical measurement results when BWP switching has not occurred, rather than always performing complete new measurements. This partial reuse of measurement data maintains sufficient accuracy while reducing the time and resources required for RLM operations
Solution Approach 2:
The patent performs preliminary measurement actions in the previous BWP that can be reused in the current BWP when no switching occurs. By preparing measurement results in advance and determining their reusability based on switching status, the system avoids redundant measurements and improves RLM efficiency
Data Source
AI summary
Example radio link monitoring methods and apparatus are described. One example method includes performing radio link monitoring (RLM) in a second bandwidth part (BWP) by a terminal device. The terminal device receives first switching information from a network device that is used to indicate that an active BWP includes a first BWP, and switches from the second BWP to the first BWP based on the first switching information. The terminal device removes a measurement result obtained by performing RLM in the second BWP, where the measurement result includes a quantity N1 of one or more out of synchronization (OOS) states or a quantity N2 of one or more in synchronization (IS) states. RLM is performed in the first BWP.