The multimedia service session handoff method in heterogeneous wireless networks
International Journal of Grid and Utility Computing
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Next generationwirelessnetworkis envisioned asa convergence ofdifferentwirelessaccess technologiesproviding the user enhanced connection any where any time to improve the systemsresourceutilization. Insuchconvergedsystems,co- existence of heterogeneous access technologies with largely different characteristics like data rate for wideband code division multiple access (WCDMA), wireless local area network (WLAN) results in handoffasymmetrythat differs fromthe traditional intra-network handoff(horizontalhandoff). Thushandoff between different access technologies (vertical handoff) is essential and remains a challenging issue. The vertical handoff (VHO) algorithm must be quality of service (QoS) aware. Conventionally, handoff analysis is performed using well known vertical handoff metric, received signal strength (RSS).In this paper, a more appropriate handoff parameter, signal to interference and noise ratio (SINR) is used to assess the system performance in terms of dropping probabilities in addition to throughput.Simulation results prove that the proposed SINR basedverticalhandoffschemeoffersenhancedsystem throughput and relatively low dropping probabilities when compared to the existing RSS based handoff scheme.