Reduction of Error in Handoff Initiation Time Calculation for Next-Generation Wireless Systems

Recent research in wireless communications technologies has focused to the development of Next-generation wireless systems (NGWS) which integrate various existing wireless networks technologies, 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 to realize seamless handoffs with small handoff latency and packet loss to ensure the Quality of Service (QoS) in NGWS. In this paper, we propose a handoff management architecture using relative signal strength of the present and neighboring base stations to calculate the handoff initiation time. To take the right decision of handoff initiation time we use mobile's speed, handoff signaling delay information and also the size of the present and neighboring cell and reduce the errors associated with them. The performance analysis shows that the approach ensures successful handoff and reduces call blocking probability.