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Wireless technologies evolve very fast in last years. In the future operators will need to enable users to use communications services independent from access technologies, thus they will need to support handovers between different networks. In this paper, the authors presented simulation results for handover from WLAN network to HSDPA network and vice versa. They used IP telephony application with SIP signalization. They 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 they used characteristics of real operator's networks.
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