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Next-Generation Wireless Systems (NGWS) integrate different wireless networks, each of which is optimized for some specific services such as WLANs, WiMAX, General Packet Radio Service (GPRS) and Universal Mobile Telecommunications System (UMTS). The most important and challenging issue is seamless handoff management in NGWS to ensure the Quality of Service (QoS). In this paper, the authors propose a handoff management architecture using signal to interference ratio of the present and neighboring base stations. This handoff management scheme uses mobile's speed, handoff signaling delay information and also the size of the present and neighboring cell to enhance the handoff performance.
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