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Nowadays, mobile users wish to use their multi-interface mobile devices toaccess the Internet through network points of attachment (PoA) based onheterogeneous wireless technologies. They also wish to seamlessly change thePoAs during their ongoing sessions to improve service quality and/or reducemonetary cost. If appropriately handled, multihomed mobile nodes offer apotential solution to this issue. In this sense, the management of multihomedmobile nodes in heterogeneous environment is a key research topic. In thispaper, we present an improvement of SIP mobility (pre-call plus mid-callmobility) to support seamless mobility of multihomed mobile nodes inheterogeneous wireless networks. Pre-call mobility is extended to associateuser identifier (i.e. SIP URI) and interface identifiers (i.e. IP addresses).The multiple addresses of a mobile device are weighted by the user to create apriority list in the SIP server so as to guarantee resilient reachability ofmobile nodes and to avoid unnecessary signaling through wireless links, thussaving radio resources. Then, three variations of mid-call mobility, calledhard, hybrid and soft procedures, are also proposed. Their main aim is tominimize, or even avoid, packet losses during interface switching at the mobilenode. The proposed solutions have been implemented in a wireless heterogeneoustestbed composed of 802.11 WLAN plus 3.5 cellular network, which are fullycontrolled and configurable. The testbed has been used to study the performanceand the robustness of the three proposed mid-call mobility procedures.

Interworking Scheme Using Optimized SIP Mobility for MultiHomed Mobile Nodes in Wireless Heterogeneous Networks