With the development of 4G mobile telecommunication systems, providing users with the convenience of a seamless continuous\nconnection is not enough anymore. Users want to be connected through the best available network with the best quality of service.\nIt is necessary to have a good decision-making algorithm which decides whether it is necessary to perform handoff to another\nnetwork, the best network to vertically perform handoff to, and the right time to initiate the handover. This paper proposes a new\napproach in which mobile terminals (MTs) continuously analyze the network and keep a database of the best available networks.\nThe concept is based on QoS aware ant colony built on the vertical handoff mechanism that uses an updated version of ants� colony\noptimization decision algorithm (ACOR), the dynamic and static factors such as RSS, the cost of service, bandwidth, the velocity\nof MT, the power consumption and security, and the module for predicting the traveling distance within an IEEE 802.11 WLAN\ncell. Simulation results show that we can not only meet the individual needs of users in terms of QoS, but also improve the whole\nsystem performance by reducing the number of handover failures and unnecessary handover instances by up to 95%.
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