In this paper, we present a dynamic bandwidth allocation strategy based on renegotiation. This strategy consists in exploring the unused resources in the network, allocating them to flows whose required bandwidth is greater than the one that was attributed to them at call admission time. These applications, which are non delay sensitive, can be admitted by the CAC (Call Admission Control) with the available bandwidth at the moment. Two scenarios are presented in order to show the functionality of the proposed system. The simulation results are analyzed and compared to the case of a system without bandwidth renegotiation.
Vehicular Ad Hoc Network (VANETs) are self-configuring networks where the nodes are vehicles equipped with wireless communication technologies. In such networks, limitation of signal coverage and fast topology changes impose difficulties to the proper functioning of the routing protocols. Most applications critically rely on routing protocols. Thus in this work, we propose a methodology for investigating the performance of well established protocols for MANETs in the VANET arena. Three routing protocols are considered: AODV, DSDV and OLSR. To ensure a meaningful evaluation of the protocols, we devised a realistic simulation environment in terms of network characteristics, communications protocols and traffic patterns. We consider the VanetMobiSim software for a more realistic simulation of vehicular movements in urban environments, as well as the NS-3 package for traffic and communication emulation. Simulation results have led to conclude that the routing protocols analyzed present variable performances in the VANET scenario, with OLSR outperforming the other studied protocols.
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