Terminal Device Interworking Between 3GPP and WLAN Networks
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Solution Overview
Problem
Terminal devices face challenges in maintaining optimal operation when moving between base stations that support and do not support the 3GPP/WLAN interworking feature, leading to potential degradation in user experience and system performance due to inappropriate access selection and traffic steering.
Innovation Solution
The terminal device determines whether the serving cell supports the 3GPP/WLAN interworking feature and modifies its behavior accordingly, either disabling the feature or continuing to operate under specific conditions, such as using default settings or parameters, to prevent unsuitable traffic steering when the cell does not support the feature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device continuously operates the 3GPP/WLAN interworking feature regardless of cell support status, then the feature availability is maintained, but the system performance degrades due to inappropriate traffic steering in non-supporting cells
Solution Approach 1:
The terminal device dynamically adjusts its operation of the 3GPP/WLAN interworking feature based on real-time detection of cell support status. When a supporting cell is detected, the feature is activated; when a non-supporting cell is detected, the feature is deactivated or operated with limitations. This dynamic adaptation resolves the contradiction by allowing the feature to be available when supported while preventing performance degradation when not supported.
2Productivity
If the terminal device detects and adapts to cell support status, then the system performance is maintained, but the device complexity increases due to additional detection and decision logic
Solution Approach 1:
The terminal device performs self-detection of cell support status for the 3GPP/WLAN interworking feature and autonomously makes decisions about whether to activate or deactivate the feature based on this detection. The device uses its own capabilities and received system information to determine support status without requiring external control, thus maintaining performance while adding only minimal detection and decision logic.
3Reliability
If the terminal device uses default settings when cell support is uncertain, then the system performance is protected, but the adaptability to optimal configurations is reduced
Solution Approach 1:
The terminal device is pre-configured with default settings for the 3GPP/WLAN interworking feature that ensure stable operation. When the cell support status is detected as uncertain or not supporting, these preliminary default settings are automatically applied to protect system performance. When support is confirmed, the device can then adapt to optimal configurations specific to that cell, thus balancing stability and adaptability.
Data Source
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AI summary
There is provided a method of operating a terminal device in a first network that is operating according to a first radio access technology, RAT, the terminal device supporting and operating according to a network interworking feature that enables and controls interworking between the first network and a network operating according to a second RAT, the method comprising determining whether a first cell in the first network that is serving the terminal device supports the network interworking feature (1101); and modifying the operation of the terminal device with respect to the network interworking feature if it is determined that the first cell does not support the network interworking feature (1103).