Multi-mode Overlay Information for Radio Access System Selection
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Solution Overview
Problem
Existing multi-mode mobile stations face challenges in efficiently selecting the most suitable radio access technology (RAT) network due to limitations in existing system selection algorithms, which do not effectively handle overlapping geographical areas with different radio access technologies.
Innovation Solution
The implementation of multi-mode overlay information that provides associations between sets of systems serving common geographical areas, including timing and priority information, allows mobile stations to perform system selection across differing radio access technologies, enabling periodic searches for higher priority systems and optimizing network selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing system selection algorithms are used, then mobile stations can select networks within single radio access technologies, but they cannot efficiently handle overlapping geographical areas with different radio access technologies
Solution Approach 1:
The patent segments the system selection process into two distinct components: (1) multi-mode overlay information that defines associations between different radio access technology systems serving common geographical areas, and (2) system selection algorithms that operate within each RAT independently. This segmentation allows the mobile station to handle multiple RATs without requiring a single complex algorithm, thereby improving adaptability while managing complexity.
Solution Approach 2:
The patent introduces multi-mode overlay information as an intermediary layer between the network and the system selection algorithms. This overlay information contains associations between different RAT systems and guides the selection process, allowing the mobile station to efficiently handle overlapping geographical areas without directly comparing all possible RAT combinations, thus resolving the contradiction between versatility and complexity.
2Reliability
If mobile stations perform comprehensive system selection across all radio access technologies, then they can find the optimal network, but the network acquisition time increases
Solution Approach 1:
The patent applies preliminary action by pre-defining associations between different radio access technology systems in the multi-mode overlay information before the mobile station performs system selection. These pre-established associations contain information about which systems serve common geographical areas and their relative priorities. When system selection is needed, the mobile station can immediately use these pre-prepared associations to quickly determine the optimal network without performing comprehensive real-time analysis, thus achieving both optimality and speed.
3Measurement precision
If mobile stations use detailed overlay information for system selection, then selection accuracy improves, but the amount of information to be processed and stored increases
Solution Approach 1:
The patent extracts only the essential information needed for system selection from the complete network data and places it into the multi-mode overlay information structure. Specifically, it extracts associations between RAT systems, their geographical coverage relationships, and priority levels, while omitting unnecessary detailed parameters. This extraction provides sufficient accuracy for system selection while keeping the information volume manageable for processing and storage in the mobile station.
Data Source
AI summary
Methods are provided for a multi-mode mobile station to perform multi-mode system selection using a multi-mode system selection algorithm as a function of multi-mode overlay information. The multi-mode overlay information includes a plurality of associations, each association being between a respective set of systems that serve at least a common geographical area, at least some of the associations being between systems using differing radio access technology. Methods are also provided for a system to prepare multi-mode overlay information that includes a plurality of associations and send the multi-mode overlay information to the mobile station.