Vertical Handover In Wireless Heterogeneous Networks

Abstract

Wireless communications are classified into different generations of networks, each generation revolutionizing the field of mobile communications. Wireless technologies have been developed with different standards and these technologies offer different data rates, coverage area and a variety of services. This has led to an increase in the demand for wireless communication services and data rate and the ability to access wireless anywhere and at any time has become a popular expectation because it provides a great deal of flexibility and freedom of movement and thus the concept of a heterogeneous wireless network is introduced to meet this demand. To achieve mobility in the heterogeneous wireless networking environment of any mobile device requires seamless connectivity and handover using vertical handover. Vertical handover is one of the optimization mechanisms that plays a major role in heterogeneous wireless networks, where heterogeneous networks are deployed on a large scale to improve the coverage rate and increase the capacity of the connection. Handover takes into account the user's mobility in the mobile network and ensures continuity of wireless services if the mobile user changes their location across cellular boundaries. In this paper an optimized resolution of vertical handover is proposed using multi-parameter metrics in a heterogeneous network environment consisting of 4 wireless networks: Wi-Fi, WIMAX, 4G, 5G. The choice of parameters plays an important role in the vertical handover decision, some parameters depend on the mobile phone and some depend on network conditions. The vertical handover decision algorithm is proposed based on the fuzzy logic model which contains six parameters for the vertical handover decision: signal strength, quality of service, mobile speed, traffic class, wireless network cost and network occupancy. Parameters are the inputs for fuzzy logic decision making and as an output, the best network is selected. Simulation results on the MATLAB and OMNET++ platform show improved performance, and the number of unnecessary deliveries has been reduced. The proposed vertical handover algorithm has a vertical handover success rate of 99% and achieves efficient handover and seamless connection between heterogeneous wireless networks. And the probability of service interruption is up to 1%.