SIP-Supported Soft Handover for the
Author
Flores Mayorga, Carlos Leonel
Term
10. term
Publication year
2007
Pages
82
Abstract
IP Multimedia Subsystem (IMS) er designet som en fælles platform til at levere kommunikationstjenester på tværs af forskellige net. I IMS-baserede mobilnet bruges en variant af Session Initiation Protocol (SIP) til at oprette og styre opkald og multimediesessioner, og i mange virksomhedsnet bruges SIP over Wi-Fi (802.11). At sammenkoble disse to SIP-baserede verdener kan give brugerne bredere dækning og uafbrudte tjenester. Dette speciale foreslår en måde at flytte en igangværende session (f.eks. et opkald) mellem et mobilt IMS-net og et virksomheds Wi-Fi-net uden at afbryde den – et såkaldt vertikal handover, fordi det krydser forskellige adgangsteknologier. Tilgangen indebærer ændringer af standard SIP-signalering, så enheden kan opnå fuld mobilitet mellem de to domæner. Vi analyserer også, hvad en SIP-klient skal understøtte, og beskriver en klient-tilstandsmaskine til at styre handover-processen. Resultaterne viser, at et SIP-understøttet soft handover – skift af adgang med fortsat IP-session og minimal afbrydelse – er gennemførligt på IP-niveau.
The IP Multimedia Subsystem (IMS) is designed as a common platform for delivering communication services across different networks. In IMS-based cellular networks, a variation of the Session Initiation Protocol (SIP) is used to set up and control calls and multimedia sessions, and many enterprise networks use SIP over Wi-Fi (802.11). Interconnecting these two SIP-based worlds can provide wider coverage and uninterrupted service. This thesis proposes a way to move an ongoing session (such as a call) between a cellular IMS network and a corporate Wi-Fi network without dropping it—a process known as vertical handover, because it crosses different access technologies. The approach makes modifications to standard SIP signaling so a device can maintain full mobility between the two domains. We also analyze what a SIP client must support and specify a client state machine to manage the handover. Results indicate that a SIP-supported soft handover—switching access while keeping the IP session established with minimal interruption—is feasible at the IP level.
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