Abstract:
The ongoing development of mobile devices and their applications increases the requirements for high data rates and large capacity of the wireless communication networks rapidly. There are Different types of wireless network systems have been developed to offer the user requirement and fitful anywhere and anytime bases. Typical examples of this wireless networks are UMTS, WIMAX and WLAN. An important issue is to integrate these heterogeneous networks and manage the mobile nodes while moving across heterogeneous networks with session continuity, lower handover failure between networks and reduce the number of unnecessary handover. To achieve this, it is important to find the right point in time to perform a handover between networks and to find a new network that, in fact, improves the connectivity over a reasonable time span.
In this thesis, vertical handover techniques for mobile users were proposed in order to reduce the unnecessary handover and handover failure. By takes the receive signal strength (RSS), available bandwidth, Travelling time prediction and mobility as decision parameters. MATLAB-2013 simulation program is used to make handover decision. It is found that when the handover delay is ( 1s) the probability of unnecessary handover is equal ZERO. And when the handover delay is ( 455ms) the probability of unnecessary handover is equal 0.04. Therefore, the probability of handover failure when the handover delay is ( 1s) it is reduced by 69.28% .And when the handover delay is ( 455ms) the probability of handover failure is reduced by 85.71%.
