Network Side Radio Link Failure Detection via Dynamic Uplink Signaling
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Solution Overview
Problem
Current methods for detecting radio link failure in cellular mobile communication systems are inefficient, often leading to resource wastage due to incorrect determination of signal quality and inability to configure periodical uplink resources to all terminal devices, especially when devices go into uplink desynchronization.
Innovation Solution
The network side actively requests terminal devices to send uplink signals and detects signal quality, allowing for real-time determination of radio link state, thereby avoiding incorrect scheduling and improving system reliability by distinguishing between synchronization and desynchronization states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodical uplink resources are configured to terminal devices to detect signal quality, then radio link failure detection is enabled, but resource availability is limited and not all terminal devices can be configured with such resources
Solution Approach 1:
The invention makes uplink resources universally available to all terminal devices by having the network side dynamically allocate resources for both data transmission and signal quality detection. Instead of relying on pre-configured periodical uplink resources that are limited in quantity, the network side can allocate uplink resources on-demand to any terminal device, enabling universal access to radio link failure detection capability across all connected terminals regardless of initial resource configuration.
2Reliability
If periodical uplink resources are used for signal quality detection, then radio link state can be monitored, but resources may be released when terminal devices enter uplink desynchronization state, making detection ineffective
Solution Approach 1:
The invention implements a feedback mechanism where terminal devices in uplink desynchronization state actively report their synchronization status to the network side. The network side uses this feedback information to identify which terminal devices have lost uplink synchronization and may have released their periodical uplink resources. This enables the network side to switch to alternative detection methods (such as detecting uplink signals on dynamically allocated resources) for these specific terminal devices, ensuring continuous and stable radio link state monitoring despite resource releases.
Data Source
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AI summary
A method and device for handling radio link failure is disclosed. The method is as follows. A device at network side requests a terminal device to send an uplink signal according to a predefined first period, and detects first signal quality. if the device at the network side determines for times of continuous predefined first value that the first signal quality is lower than a predefined first threshold, the device at the network side requests the terminal device to send the uplink signal according to a predefined second period, and detecting second signal quality. When determining according to the second signal quality that restoration of a radio link of the terminal device is failed, the device at the network side releases network resources corresponding to the radio link of the terminal device. The predefined second period is larger than the predefined first period. In the embodiments of the present invention, the device at the network side initiatively requests the terminal device to send the uplink signal and detects the signal quality, thereby accurately determining the state of radio link of the terminal device, effectively avoiding wrong operations caused by wrong determination and improving system reliability.