Ομαδική κάθετη διαπομπή με συσταδοποίηση σε οχηματικά δίκτυα ειδικού σκοπού

Abstract

The gradual establishment of 5th generation networks upgrades the role and use of vehicle networks. An environment of high mobility, multiple requirements, and a variety of devices, is called to embrace the existing models of mobility management. Vehicles with high mobility are required to always be connected to the network that satisfies their services in the best way. However, this need is growing rapidly, burdening the network with the management of signaling and the continuous monitoring of vehicles during their transmission. Therefore, it is necessary to design a transmission mechanism for the 5th generation vehicle networks together with the use of clustering algorithms for their grouping. In the present work, a clustering and selection algorithm of the cluster head is proposed together with an efficient Group Vertical Handover (GVHO) scheme for its full implementation. The respective access point groups its coverage radius into clusters, where its head, fulfilling all the necessary criteria, is responsible for initialization, next network selection and transmission completion processes. The members of the cluster are informed about the impending handover from the cluster head but also among themselves. As a result, they establish the new communication channel for the exchange of up and down link packets. The proposed scheme applies to a next-generation vehicle network architecture consisting of Long Term Evolution Advanced (LTE-A), IEEE 802.16 Worldwide Interoperability for Microwave Access (WiMAX) macro and femto cells, and IEEE 802.11p Wireless Access for Vehicular Environment (WAVE) Road Side Units (RSUs). Experimental results show that the proposed method outperforms existing handover schemes.