System and method for call handoff between circuit switched and packet data wireless networks

摘要

The hybrid mobile terminal is engaged in an existing call through a serving one of a circuit switched or packet data wireless networks. The mobile terminal places a new call through the target one of the wireless networks, the new call having a predetermined called party identifier. In response to the called party identifier, the call is converted to a loop-back call directed to the mobile terminal through the serving wireless network, establishing a call path through the target wireless network. The mobile terminal accepts the loop-back call, and directs the existing call to connect to the call path through the target wireless network. The existing call through the original network is then dropped, effecting an inter-system handoff from the serving to the target wireless network.

主权项

1. A method of hand off from a serving one of a packet data or circuit switched wireless network to a target one of the networks, for a hybrid mobile terminal capable of communications through both networks and engaged in an existing call through the serving wireless networks, comprising:
receiving a new call from the mobile terminal through the target wireless network, the new call having a predetermined called party identifier; in response to the called party identifier, routing the new call back to the mobile terminal through the serving wireless network; and connecting the existing call to the mobile terminal through the target wireless network.