Patent ID: 7346027

Claim:
A method of handling an uninterrupted software download by a user equipment in an Internet Protocol (IP)—based mobile communication system during a handover between a first access network and a second access network using different access technologies, wherein a software download session is set up and managed by means of a session initiation protocol (SIP), wherein user agent applications and proxy and registrar servers are made available at the user equipment and within access and core networks, respectively, to handle SIP processes, comprising: receiving in the second access network a new IP address and a new URL; determining by said user agent application of the user equipment to be under a different access network; sending by said user agent application of the user equipment, without releasing the software download session, a transfer request message to an SIP proxy server managing the software download session, said transfer request message containing information about the IP address and the URL in the first access network, the new URL, a session identity and a last software packet that has been successfully received, said transfer request message indicating to said SIP proxy server that the software download session is to be transferred to the user agent application at the new URL; initiating at said SIP proxy server operations in order that a new session is set up with the user agent application at the new URL, under control of a further SIP proxy server assigned to manage the new session; and resuming said software download at said last received packet.