Radio Terminal Switching Between Mobile Network and Wireless LAN
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Solution Overview
Problem
Existing radio terminals face challenges in accurately switching between mobile communication networks and wireless LANs due to reliance on outdated signal measurement information, leading to inappropriate switching processes.
Innovation Solution
A radio terminal with a controller that executes a switching process between mobile communication networks and wireless LANs based on predetermined conditions, where the controller determines the validity of wireless LAN information and sets a predetermined acquisition cycle for reliable switching, ensuring that only current information is used for decision-making.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radio terminal continuously monitors wireless LAN information to ensure accurate switching decisions, then the switching reliability is improved, but the power consumption and processing load increase
Solution Approach 1:
The radio terminal preliminarily determines whether switching conditions are met by evaluating mobile communication network information first, and only acquires wireless LAN information when necessary. This preliminary filtering action reduces unnecessary information acquisition and processing, thereby lowering power consumption while maintaining reliable switching decisions.
Solution Approach 2:
Instead of continuously monitoring all wireless LAN parameters, the terminal performs partial monitoring only when switching conditions are potentially met. The terminal acquires wireless LAN information partially and only when mobile network conditions indicate a possible switch is needed, reducing overall power consumption while maintaining switching reliability.
2Speed
If the radio terminal uses outdated wireless LAN information for switching decisions, then the processing speed is improved, but the switching accuracy deteriorates
Solution Approach 1:
The terminal performs preliminary evaluation of mobile network conditions before acquiring wireless LAN information. This preliminary action allows the system to quickly determine whether switching is necessary without immediately accessing potentially outdated WLAN data, thus maintaining processing speed while ensuring accuracy when switches are actually performed.
Solution Approach 2:
The radio terminal autonomously manages its own information acquisition strategy by determining when to update wireless LAN information based on current mobile network conditions. This self-service approach ensures information is fresh enough for accurate decisions while avoiding unnecessary updates that would slow down processing.
3Measurement precision
If the radio terminal frequently updates wireless LAN information to maintain accuracy, then the switching accuracy is improved, but the loss of time increases
Solution Approach 1:
The terminal performs preliminary checks of mobile network conditions before initiating wireless LAN information updates. This preliminary action prevents unnecessary update cycles, reducing time loss while ensuring updates occur only when they will contribute to accurate switching decisions.
Solution Approach 2:
The terminal performs partial information acquisition only when switching conditions are potentially met, rather than frequently updating all wireless LAN parameters. This partial action reduces the time required for information acquisition while maintaining sufficient accuracy for making correct switching decisions.
Data Source
AI summary
A radio terminal comprises a controller configured to perform a predetermined process for switching a standby target or a connection target between a mobile communication network and a wireless LAN when at least a part of a coverage area of the wireless LAN overlaps a coverage area of the mobile communication network. The controller executes the predetermined process when a state where first information at the mobile communication network side satisfies a first condition and second information at the wireless LAN side satisfies a second condition is continued over a predetermined period. The controller determines whether or not the second information at the wireless LAN side satisfies the second condition, when a validity period set to the second information at the wireless LAN side has not expired.