Heterogeneous network concept was introduced to satisfy the demands of network�s traffic capacity and data rate. It consists of\nmultiplatformnetworks with various radio access technologies.Conventionally, a mobile usermay roamand accomplish the vertical\nhandover using single criteria, such as received signal strength (RSS). Single criteria vertical handover decision, however, may cause\ninefficient handoff, unbalanced network load, and service interruption. This paper proposed an improved vertical handover decision\nusing multicriteria metrics in the environment of heterogeneous network consisting of three network interfaces: (i) wireless local\narea network (WLAN), (ii) wideband code divisionmultiple access (WCDMA), and (iii) worldwide interoperability for microwave\naccess (WiMAX). In the vertical handover decision, four metrics are considered: (i) RSS, (ii) mobile speed, (iii) traffic class, and (iv)\nnetwork occupancy.There are three types of the vertical handover decision algorithm: (i) equal priority, (ii) mobile priority, and (iii)\nnetwork priority. Equal prioritymulticriteria handover algorithmimproved the number of handoffs by 46.60 whilemobile priority\nmulticriteria algorithm improved the number of handoffs by 90.41% and improved the balance index by 0.09%. Network priority\nmulticriteria method improved the number of handoffs by 84.60%, balance index by 18.03%, and average blocking probability by\n20.23%.
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