METHOD FOR CONTROLLING HAND-OFF IN THE MIDST OF RING BACK TONE AMONG MOBILE SERVICE SWITCHING CENTERS IN A SERVING MOBILE SERVICE SWITCHING CENTER

摘要

According to the present invention, a mobile subscriber station (hereinafter referred to as an exchange) attempts to make a call and moves to an area controlled by another mobile communication switch while receiving a ring back tone (hereinafter referred to as RBT). The present invention relates to a switching period handoff control method during a ringback tone in a serving mobile communication exchange suitable for continuously maintaining a call path for an ongoing call. In the related art, a handoff is performed only when a mobile subscriber is in a busy state. Although there is a drawback that the call quality is degraded or the call is dropped for the current call, that is, the call of the subscriber receiving the RBT by providing the service, in the present invention, the calling mobile subscriber at the mobile communication exchange receives another RBT while receiving the RBT. Move to the area controlled by the By preventing the disconnection of ongoing calls and providing better call quality service, the above-mentioned drawbacks can be ameliorated.