초록 ▼

Mobile handover between a private radio communications network connected to the public switch telephone network and a public land mobile network also connected to the public switch telephone network are provided by a radio communications mobile terminal supporting simultaneous communication connecti

Mobile handover between a private radio communications network connected to the public switch telephone network and a public land mobile network also connected to the public switch telephone network are provided by a radio communications mobile terminal supporting simultaneous communication connections between the two uncoordinated networks. The mobile terminal monitors a base station of the public land mobile network during idle frames of communication connections with the private radio communications network, thereby synchronizing the mobile terminal to both the base of the public land mobile network and the private radio communications network. Call interruption is prevented during handover by maintaining simultaneous communications with the private radio communications network and the public land mobile network through the use of two half-rate channels or dual-slot communications where both the public land mobile network and private radio communications network operate pursuant to compatible TDMA standards. Handover is initiated when the mobile terminal detects a signal quality which violates a predetermined switching criteria and passes the PSTN phone line number of the private radio communications network to the base station of the public land mqbile network which in turn requests re-routing of the call from the PSTN switch.

대표청구항 ▼

[ What is claimed is:] [12.] A method for mobile assisted handover between a private radio communications network connected to a wire line switch and having a wire line number and a public land mobile network of a first communication connection between the mobile terminal and the wire line switch in

[ What is claimed is:] [12.] A method for mobile assisted handover between a private radio communications network connected to a wire line switch and having a wire line number and a public land mobile network of a first communication connection between the mobile terminal and the wire line switch including a first radio communication connection between the mobile terminal and the private radio communications network, said method comprising the steps of:monitoring a base station of the public land mobile network at the mobile terminal and synchronizing the mobile terminal to the base station of the public land mobile network;establishing the first radio communication connection between the mobile terminal and a base station of the private radio communications network which is not coordinated with the base station of the public land mobile network, in that common shared frame timing is not provided between the private radio communications network and the public land mobile network, by synchronizing the base station of the private radio communications network to the mobile terminal;detecting a signal quality of the first radio communication connection from the private radio communications network at the mobile terminal;establishing a second radio communication connection between the mobile terminal and the public land mobile network simultaneously with the first radio communication connection if the detected signal quality has violated a predetermined switching criteria; andreporting the wire line number of the private radio communications network to the public land mobile network over the second radio communication connection.