@conference {ElFachtali2017824, title = {Power-optimized vertical handover scheme for 4th generation heterogeneous wireless network}, booktitle = {Colloquium in Information Science and Technology, CIST}, year = {2017}, note = {cited By 0}, pages = {824-829}, abstract = {Minimizing the total power consumption required for vertical handovers in 4th generation heterogeneous wireless networks is as important as providing users with the best QoS(Quality of Service) continuously. This letter proposes a vertical handover scheme to minimize the total power consumption required for a vertical handover in 4th generation heterogeneous wireless networks, while guaranteeing a particular QoS. The proposed scheme is based on an updated Tabu-search scheme, which helps to efficiently explore the network in order to find an optimal solution and to provide a service performance that adheres to predefined service level agreements (SLA). Simulation results show that the proposed scheme can lead to lower total power consumption compared to the RSS (Received Signal Strength) based scheme. The proposed method can achieve promising results in terms of bandwidth, security and cost of service, while minimizing the power consumption. {\textcopyright} 2016 IEEE.}, doi = {10.1109/CIST.2016.7805001}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85010224341\&doi=10.1109\%2fCIST.2016.7805001\&partnerID=40\&md5=34fca482e3ee5b9533ec0539843e2bb7}, author = {El Fachtali, I.a and Saadane, R.b and El Koutbi, M.a and Chaibi, H.a} } @article {ElFachtali2016, title = {Vertical handover decision algorithm using ants{\textquoteright} colonies for 4G heterogeneous wireless networks}, journal = {Journal of Computer Networks and Communications}, volume = {2016}, year = {2016}, note = {cited By 1}, abstract = {With the development of 4G mobile telecommunication systems, providing users with the convenience of a seamless continuous connection is not enough anymore. Users want to be connected through the best available network with the best quality of service. It is necessary to have a good decision-making algorithm which decides whether it is necessary to perform handoff to another network, the best network to vertically perform handoff to, and the right time to initiate the handover. This paper proposes a new approach in which mobile terminals (MTs) continuously analyze the network and keep a database of the best available networks. The concept is based on QoS aware ant colony built on the vertical handoff mechanism that uses an updated version of ants{\textquoteright} colony optimization decision algorithm (A C O R), the dynamic and static factors such as RSS, the cost of service, bandwidth, the velocity of MT, the power consumption and security, and the module for predicting the traveling distance within an IEEE 802.11 WLAN cell. Simulation results show that we can not only meet the individual needs of users in terms of QoS, but also improve the whole system performance by reducing the number of handover failures and unnecessary handover instances by up to 95\%. {\textcopyright} 2016 Imad El Fachtali et al.}, doi = {10.1155/2016/6259802}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961880430\&doi=10.1155\%2f2016\%2f6259802\&partnerID=40\&md5=76d5e50d1d0c97071ba232ad71f47e0e}, author = {El Fachtali, I.a and Saadane, R.b and Elkoutbi, M.a} }