QOS based vehicle selection and co-operative data transfer for vehicular ad hoc networks [articol]

Abstract

utilizing the benefits of Directed Short Range Communication (DSRC) VANET gets deployed as a means of assisting driving personnel. The information necessitated from the base infrastructure or any Road Side Units (RSU) gets disseminated and gets intermittent owing to vehicular mobility. Consistently wavering link stability and curtailed bandwidth utilization accounts for a feeble data transmission among vehicles travelling on a highway. Hence, the concept of data downloading and offloading gets introduced. The data being requested from the RSU gets downloaded to fulfill user need in projected in various aspects given as entertainment, mapping resource etc. The data requested sometime necessitates a huge occupancy of memory space as well as bandwidth for accomplishing a robust transmission. VANET starves a lot to fulfil such criterion amidst of consistent mobility. This leads to information loss and information abuse too. Hence, to overcome all these issues, this paper proposes a robust QoS based Cooperative Data Transfer (QoS-CDT) methodology. The neighborhood discovery procedure evolves on the basis of trust factor, memory possessed, geographical location, energy available and the bandwidth necessitated by that node for transferring the information requested. A caching protocol involves in managing the memory space residing in the cache of intermediate nodes along with authorization of trust provided by a Certification Authority (CA). Thus the devised QoS-CDT enriches its capability in outperforming other prevailing methodologies in terms of throughput, routing control overhead, Packet Delivery Ratio (PDR) and transmission delay.