Oturum başlatma protokolünde yeniden kaydolma süresini azaltmak için önerilen bir iyileştirmenin simülasyon yolu ile incelenmesi.

In this thesis, the Session Initiation Protocol (SIP) is studied and an improvement for faster re-registration is proposed. This proposal, namely the أregistration ا activationؤ, is investigated with a simulation prepared using OPNET. The literature about wireless mobile networks and SIP mobility is reviewed. Conditions for an effective mobile SIP network simulation are designed using message sequence charts. The testbed in [1] formed by Dutta et. al. that has been used to observe SIP handover performance is simulated and validated. The mobile nodes, SIP Proxy v servers, DHCP servers and network topology are simulated on أOPNET Modeler Radioؤ. Once the simulation is proven to be valid, the أregistration ا activationؤ is implemented. Different simulation scenarios are set up and run, with different mobile node speeds and different numbers of mobile nodes. The results show that the re-registration delay is improved by applying the أregistration ا activationؤ but the percentage of improvement depends on the improvement in the database access delay in the SIP Proxy server.M.S. - Master of Scienc