Terminal Device Parameter Management for Network Selection
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Solution Overview
Problem
Terminal devices capable of WLAN/3GPP radio interworking face challenges in access network selection and traffic steering due to dedicated parameters received from one 3GPP cell being unsuitable for another cell, leading to repeated connection attempts and increased signaling load, especially when load conditions change.
Innovation Solution
Implementing a method where terminal devices use broadcast parameters upon rejection of a connection request and discard dedicated parameters, allowing for dynamic adaptation of network selection and traffic steering based on current conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminal devices use dedicated parameters received from one 3GPP cell for access network selection and traffic steering, then the parameters provide specific optimization for that cell, but the parameters become unsuitable when the device moves to another cell with different load conditions
Solution Approach 1:
The patent implements dynamic parameter management where terminal devices transition from using dedicated parameters to broadcast parameters based on connection status. When a connection request is rejected, the device dynamically switches to broadcast parameters that are universally applicable across different cells, ensuring parameters remain suitable regardless of cell-specific load conditions changes
Solution Approach 2:
The patent changes the parameter source from dedicated (cell-specific) to broadcast (network-wide) based on connection rejection. This parameter change allows the terminal device to adapt to different cell conditions by using parameters that are updated frequently and applicable to current network state, resolving the contradiction between parameter precision and adaptability
2Stability of the object's composition
If terminal devices continue using dedicated parameters after connection request rejection, then parameter continuity is maintained, but repeated connection attempts increase signaling load
Solution Approach 1:
The patent applies the principle of discarding dedicated parameters when connection requests are rejected. Instead of continuing to use outdated dedicated parameters that lead to repeated failed attempts, the terminal device discards them and switches to broadcast parameters. This prevents wasteful repeated signaling while maintaining parameter continuity through the broadcast parameter mechanism
Solution Approach 2:
The patent uses feedback from connection request rejection as a trigger to change parameter usage. The rejection signal provides feedback that the current dedicated parameters are no longer appropriate, prompting the terminal device to switch to broadcast parameters. This feedback mechanism prevents continued unsuccessful connection attempts and reduces unnecessary signaling load
3Adaptability or versatility
If terminal devices switch to broadcast parameters upon connection rejection, then adaptability to current network conditions improves, but loss of cell-specific optimization occurs
Solution Approach 1:
The patent implements a dynamic parameter selection mechanism where the terminal device uses dedicated parameters when connected (for cell-specific optimization) and switches to broadcast parameters when connection is rejected (for network-wide adaptability). This dynamic switching resolves the contradiction by applying the appropriate parameter type based on connection status
Solution Approach 2:
The patent segments parameter usage into two distinct modes: dedicated parameter mode during successful connection for cell-specific optimization, and broadcast parameter mode after connection rejection for broader network adaptability. This segmentation allows each parameter type to be used in the context where it provides maximum benefit, resolving the precision-versus-adaptability trade-off
Data Source
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AI summary
An aspect provides a method of operating a terminal device in a communication network, the method comprising, on rejection of a connection request to a network node, (i) using broadcast parameters that have been broadcast from the or another network node in an access network selection and/or traffic steering or routing procedure (607) and/or (ii) discarding dedicated parameters that have been received from a network node using dedicated signalling, the dedicated parameters being for use in the access network selection and/or traffic steering or routing procedure (617).