Seamless Handover with Wireless LAN, Mobile IP, MISP and PDMA

We designed and implemented seamless handover on wireless LAN with MISP (Mobile Internet Services Protocol), PDMA (Packet Division Multiple Access) and mobile IP. MISP is a protocol designed for mutual authentication, IP address assignments, session key sharing and various negotiations between mobile nodes and access points with a single exchange of packets after receiving beacons. By MISP, a mobile node can quickly establish link with access points. PDMA is a new paradigm for duplexing/multiplexing accesses. It uses CSMA/CA not only within cells but also between cells to dynamically allocate communication bandwidth between cells and enables mobile nodes to access simultaneously to all the available access points. PDMA naturally enables mobile nodes to support seamless make-before-break style handover and to find beacons from new access points quickly. The protocols are implemented with IEEE802.11a turbo mode (108Mbps) and evaluated by a laboratory trial and a field trials with a car moving at 30km/h.