TY - JFULL AU - Diganta Kumar Pathak and Manashjyoti Bhuyan and Vaskar Deka PY - 2014/11/ TI - Estimation of Vertical Handover Probability in an Integrated UMTS and WLAN Networks T2 - International Journal of Electronics and Communication Engineering SP - 1652 EP - 1659 VL - 8 SN - 1307-6892 UR - https://publications.waset.org/pdf/10000387 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 94, 2014 N2 - Vertical Handover(VHO) among different communication technologies ensuring uninterruption and service continuity is one of the most important performance parameter in Heterogenous networks environment. In an integrated Universal Mobile Telecommunicatin System(UMTS) and Wireless Local Area Network(WLAN), WLAN is given an inherent priority over UMTS because of its high data rates with low cost. Therefore mobile users want to be associated with WLAN maximum of the time while roaming, to enjoy best possible services with low cost. That encourages reduction of number of VHO. In this work the reduction of number of VHO with respect to varying number of WLAN Access Points(APs) in an integrated UMTS and WLAN network is investigated through simulation to provide best possible cost effective service to the users. The simulation has been carried out for an area (7800 × 9006)m2 where COST-231 Hata model and 3GPP (TR 101 112 V 3.1.0) specified models are used for WLAN and UMTS path loss models respectively. The handover decision is triggered based on the received signal level as compared to the fade margin. Fade margin gives a probabilistic measure of the reliability of the communication link. A relationship between number of WLAN APs and the number of VHO is also established in this work. ER -