Patent ID: 6112088
Filing Date: 2000-08-29
Classification: H04W

Abstract:
A method for mobile assisted handover between a TDMA private radio communications network connected to a wire line switch and having a wire line number and a TDMA public land mobile network, of a first communication connection between a 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 having a frame timing at the mobile terminal and synchronizing a frame timing of the mobile terminal to the frame timing of 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 using the frame timing of the mobile terminal, the base station of the private radio communications network having a frame timing uncoordinated with the frame timing of 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;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;reporting the wire line number of the private radio communications network to the public land mobile network over the second radio communication connection; and, initiating rerouting of the first communication connection from the wire line switch to the public land mobile network.