| 摘要 |
A GSM1x-to-GSM handoff feature allows a GSM1x subscriber with a dual-mode (GSM1x and GSM modes) handset to seamlessly roam from GSM1x coverage areas to GSM coverage areas. This functionality is facilitated by the GSM1x system design which integrates a CDMA RAN with a standard GSM core network. The GSM1x system is built using standard CDMA as its air interface and an unmodified CDMA RAN with a standard IOS interface to the MSN. The only modifications are done at the MSN and the MS.
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