Performance evaluation of SIP based handover in heterogeneous access networks

Authors:
Rok Libnik;Ales Svigelj;Gorazd Kandus
Affiliations:
Network and Services Development Department, Telekom Slovenije d.d., Ljubljana, Slovenia;Department of Communication Systems, Jozef Stefan Institute, Ljubljana, Slovenia;Department of Communication Systems, Jozef Stefan Institute, Ljubljana, Slovenia
Venue:
WSEAS TRANSACTIONS on COMMUNICATIONS
Year:
2008

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Abstract

Wireless technologies evolve very fast in last years. In the future operators will need to enable users to use communication's services independent from access technologies, thus they will need to support handovers between different networks. In this paper we presented simulation results for handover from WLAN network to HSDPA network and vice versa. We used IP telephony application with IP signalization. We proposed new approach, which is more applicable to real operator environment as assures proper billing during handover. The handover was executed using simple decision function, based on received signal measurement. To achieve more credible results we used characteristics of real operator's networks. Simulation results show that both handovers i.e. from WLAN to HSDPA network and from HSDPA to WLAN network have some limitations which can affect the quality of service especially for real time application, like VoIP. With result we also shoved that characteristics of today's networks are not good enough to offer seamless handover using SIP protocol and that mobile packet wireless networks will need to improve to offer lower latencies.