Network Selection in WLAN-Cellular Interworked Networks
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Solution Overview
Problem
In wireless communication systems, multi-mode terminals face challenges in efficiently selecting and managing network connections between cellular and WLAN networks, particularly in determining appropriate metrics for traffic allocation and reporting, which affects network performance and user experience.
Innovation Solution
A method and apparatus for network selection in a cellular and WLAN interworked network, where a user equipment (UE) determines its association state with a WLAN access point, selects relevant metrics based on this state, and reports them to a base station, allowing for dynamic traffic allocation and optimization of network usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE reports all available metrics for both associated and unassociated states, then the network can make optimal traffic allocation decisions, but the signaling overhead and processing complexity increase significantly
Solution Approach 1:
The patent segments the metrics into two distinct sets based on the association state: a first set of metrics for when the UE is associated with the WLAN access point, and a second set of metrics for when the UE is unassociated. This segmentation allows the UE to report only relevant metrics for its current state, reducing signaling overhead while maintaining sufficient information for network decisions.
Solution Approach 2:
The patent implements dynamic metric selection where the UE adapts which metrics to report based on its current association state with the WLAN access point. The UE dynamically switches between reporting the first set of metrics (when associated) and the second set of metrics (when unassociated), optimizing the balance between information quality and signaling efficiency.
2Reliability
If the UE continuously monitors and reports WLAN metrics, then the network can dynamically optimize traffic allocation, but the power consumption increases
Solution Approach 1:
The patent implements periodic monitoring and event-triggered reporting mechanisms. Instead of continuous monitoring, the UE periodically checks its association state and reports metrics only when state changes occur or when reporting is explicitly requested by the network. This periodic action reduces power consumption while maintaining the ability to dynamically optimize traffic allocation.
Solution Approach 2:
The patent enables the network to request specific metric reports based on current network conditions and needs. Rather than the UE continuously reporting all metrics, the network can selectively request reports when optimization is needed, allowing the system to self-regulate power consumption based on actual performance requirements.
3Productivity
If the UE selects metrics from a comprehensive set regardless of association state, then all possible optimization opportunities are captured, but the processing overhead and reporting burden increase
Solution Approach 1:
The patent divides the comprehensive metric set into two segments: metrics relevant to associated state (first set) and metrics relevant to unassociated state (second set). This segmentation enables the UE to quickly select from a smaller, context-appropriate subset of metrics, reducing processing overhead and reporting time while capturing all necessary optimization opportunities for the current state.
Solution Approach 2:
The patent pre-defines which metrics are relevant for each association state before runtime. By establishing the first set and second set of metrics in advance based on association state, the UE avoids real-time analysis of all possible metrics, significantly reducing metric selection time and processing burden during actual operation.
Data Source
AI summary
A method for network selection in a cellular and WLAN interworked network may include determining, by a UE, an association state between the UE and a WLAN access point. The UE may select a metric of the access point, based at least in part on the determined association state. The UE may determine a value of the metric. The UE may determine whether to report the value of the metric to a base station of the cellular wireless network, based on various factors. These factors may include the association state, the value of the at least one metric relative to a threshold value, a change in the association state, or receiving a reporting instruction from the base station. The UE may report the value of the metric to a base station, based on its determination. A base station may perform operations complementary to the UE, for network selection.