| 摘要 |
A multi-mode mobile station performs an inter-system handoff between systems, qualified by the presence or absence of a preferred wireless communication network in a roaming lookup table (703) stored and maintained in either mobile station memory or with the network controller. In one embodiment the accurate location of the mobile unit is determined by a global position fix, after which a coverage map is consulted to verify the availability of a preferred network before initiating a background scan. In other embodiments, a learning function creates habit profiles of a subscribers regular behavior upon which the system intelligently initiates scanning for preferred network.
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