Patent ID: 8428031

Claim:
A method of facilitating handover of an active call or packet session conducted between a mobile station and a WCDMA public land mobile network via a public land mobile network cell controlled by a radio network controller from said public land mobile network cell to an unlicensed access network cell that is served by an unlicensed access network controller connected to said WCDMA public land mobile network, said method including the steps of in said unlicensed access network controller, receiving a register request message from said mobile station, said register request message including a frequency number indicative of a radio frequency used in said public land mobile network cell and extracting from said register request message said frequency number, adopting said frequency number as an identifying frequency for said unlicensed access network controller in said public land mobile network cell to enable the mobile station to report a signal strength for said unlicensed access network cell to radio network controller without indicating a radio frequency that is different from that used in public land mobile network cell, and sending a register accept message to said mobile station, said register accept message including information indicative of said adopted frequency together with an identifier for said unlicensed access network controller.