Radio Link Detection on Unlicensed Bands
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Solution Overview
Problem
Existing wireless communication systems fail to detect radio link failures effectively when using unlicensed frequency bands, as existing methods are not adapted for these bands and face interference from busy channels during the detection process.
Innovation Solution
A radio link detection method and apparatus that utilize timers and random access problem indications to determine radio link failures on unlicensed frequency bands, with adjustments to detection parameters based on channel payload measurements, allowing for accurate detection even in interference conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing radio link failure detection methods are used on unlicensed frequency bands, then the detection process can be performed, but the detection accuracy deteriorates due to interference from busy channels
Solution Approach 1:
The patent changes the detection parameters by introducing new timer mechanisms (first timer for radio link monitoring, second timer for reestablishment) and adjusting the detection thresholds based on channel conditions. This allows the system to adapt to unlicensed band characteristics and reduce false detections caused by channel interference
Solution Approach 2:
The patent implements dynamic detection by continuously monitoring channel conditions and adjusting the radio link failure detection process in real-time. The system dynamically switches between different detection modes based on whether the channel is busy or idle, improving reliability under varying interference conditions
2Measurement precision
If radio link failure detection is performed on unlicensed frequency bands without parameter adjustments, then the detection process is simple, but the detection precision deteriorates due to channel interference
Solution Approach 1:
The patent introduces specific parameter adjustments including modified timer values and detection thresholds tailored for unlicensed bands. These parameter changes improve detection precision without requiring complete redesign of the detection architecture
Solution Approach 2:
The patent segments the detection process into distinct phases: a first timer for initial radio link monitoring and a second timer for reestablishment attempts. This segmentation allows precise control over each detection stage while maintaining overall process manageability
Data Source
AI summary
A radio link detection method and apparatus and a communication system, the radio link detection apparatus being provided in a terminal equipment and including a detector, when a first timer related to radio link monitoring expires, the detector configured to determine that a radio link using an unlicensed frequency band fails, or, when a higher layer of the terminal equipment receives a random access problem indication and a second timer related to reestablishment is not running, the detector determining that a radio link using an unlicensed frequency band fails. Certain embodiments herein may provide for detecting a radio link failure using an unlicensed frequency band.