Multi-Mode Mobile Station Handover via Licensed Network Backup
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Solution Overview
Problem
Existing handover techniques between licensed and unlicensed wireless access networks in UMA systems often result in active call connections being released due to excessive signal loss or delay during signaling sessions, especially when signal quality deteriorates abruptly.
Innovation Solution
A handover method for a multi-mode mobile station that determines the need for connection re-establishment to a licensed wireless access network if no response is received from the unlicensed wireless access network within a predetermined time, ensuring continuous service by proactively requesting a connection re-establishment to a licensed network during active calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If handover is performed between unlicensed and licensed wireless access networks, then service coverage and mobility are improved, but signal loss and call connection release occur during signaling sessions
Solution Approach 1:
The mobile station performs preliminary actions by establishing a connection to the licensed wireless access network before completely disconnecting from the unlicensed network during handover. This ensures that if signaling fails or signal loss occurs, the connection can be maintained through the pre-established licensed network path, preventing call release.
Solution Approach 2:
The invention provides a backup communication path through the licensed wireless access network before the handover is complete. This cushioning mechanism ensures that if the unlicensed network signaling fails or experiences signal loss, the call connection is already protected by the established licensed network connection, preventing service interruption.
2Productivity
If handover signaling is performed with unlicensed wireless access network, then seamless service transition is achieved, but excessive signal loss or delay causes call release
Solution Approach 1:
The licensed wireless access network serves as an intermediary during the handover process. Instead of directly relying on the unlicensed network for the entire handover signaling, the mobile station uses the licensed network as a mediator to establish a backup connection, ensuring that signaling failures or signal loss in the unlicensed network do not cause call release.
3Productivity
If multi-mode mobile station uses unlicensed wireless system, then data rate increases and maintenance cost decreases, but service area is limited and mobility is reduced
Solution Approach 1:
The mobile station is designed with multi-functionality to operate in both unlicensed and licensed wireless access networks. This universal capability allows the device to take advantage of the high data rate of unlicensed networks when available, while automatically falling back to licensed networks when service area coverage or mobility requirements exceed unlicensed network capabilities.
Data Source
AI summary
An improved handover method and apparatus for an Unlicensed Mobile Access (UMA) technology-enabled multi-mode mobile station is provided. A handover method of the present invention includes determining a handover during an active call session with an unlicensed wireless access network; sending a handover request message to the unlicensed wireless access network; and re-establishing, if no replay is received from the unlicensed wireless access network in a predetermined time in response to the handover request message, a connection to a licensed wireless access network for the active call session.