A Proactive VHD Algorithm in Heterogeneous Wireless Networks for Critical Services
Keywords:Multi criteria decision making problem, Handover decision, Heterogeneous wireless networks, Vertical handover
Progress in the telecommunications sector has opened new scenarios where users wantÂ to access any application or service from any device anywhere at any time, connectedÂ to any network. In this environment, the Heterogenerous Wireless Networks (HWN)Â is the main operating infrastructure, intended to support the technical and qualityÂ needs that these users and services demand, along with the versatility and availabilityÂ that comes with being able to connect to any interface. One of the most importantÂ characteristics of HWN is the possibility to connect many kinds of Radio Access
Networks (RAN) like WiFi, WiMAX,GSM, UMTS, HSPA, LTE, among others. ThisÂ brings many challenges in HWN surroundings, one of the most important is ensuringÂ that a user terminal can move from one access network to another without losingÂ connectivity and, of course, the service.Â
The aim of this paper is to propose a Vertical Handover Decision Algorithm (VHODA)Â that enables a single user terminal to initiate a proactive decision based on userÂ preferences and QoS parameters, while at the same time considering the networksÂ conditions to avoid over burdening an interface. The development of our VHO-DA wasÂ addressed like a Multi Criteria Decision Making Problem (MCDM) in order to provideÂ the best possible connection for critical services and maintaining load balancing inÂ networks.
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