Patent ID: 8620320
Filing Date: 2013-12-31
Classification: H04W

Abstract:
1. A method of performing call handover of a call in progress at a mobile communication device between networks having dissimilar air interfaces, comprising: receiving from the mobile communication device at a base station of a first communication network first neighbor cell measurement, the first neighbor cell measurement performed by the mobile communication device on a neighbor cell of the base station of the first communication network; determining, at the base station of the first communication network, that the neighbor cell measurement indicates handover to a second communication network is desirable, wherein the second communication network uses a different air interface than the first communication network; transmitting to the mobile communication device from the base station of the first communication network a neighbor cell list including at least one neighbor cell of a second communication network; receiving from the mobile communication device at the base station of the first communication network a session profile including session control and protocol parameters desired by the mobile communication device for the call on the second communication network; receiving from the mobile communication device at the base station of the first communicating system a neighbor cell measurement of the at least one neighbor cell of the second communication network; commencing a handover negotiation with a radio network access controller of the second communications network from the base station of the first communication network; receiving from the radio access controller at the base station of the second communication network a handover grant message including a target base station identifier and connection parameters, the target base station identifier corresponding to a target base station of the second communication network; and transmitting the target base station identifier and connection parameters to the mobile communication device; wherein the mobile communication device uses the target base station identifier to handover to the target base station of the second communication network according to the connection parameters.