Abstract
The emerging SDVN (Software Defined Vehicular Network) paradigm promises to bring flexibility and efficient resource utilization to vehicular networks, enabling the emergence of novel Intelligent Transportation Services. However, as it was initially designed with wired network in mind, applying the SDN paradigm to a vehicular context faces new challenges related to the peculiar characteristics of this network (high node mobility and node density, and the presence of wireless links). In this paper, we focus on one of the critical architectural elements of SDVN, namely, the SDN Controller Placement, and promote the use of dynamic placement methods that take into account the dynamicity of vehicular networks’ topology. We also describe the different approaches towards a dynamic controller placement and also propose an ILP (Integer Linear Programming) based dynamic placement method that adaptively readjusts the number and placement of controllers according to road traffic fluctuations. The proposed method is evaluated using a realistic traffic trace from Luxembourg City. Simulation results show that our approach outperforms the static approach as proposed in the literature.
Highlights
A variety of emerging Intelligent Transportation Systems (ITS) services related to cooperative and automated driving are envisioned for the near future [1,2,3]
In comparison to Reference [15], we argue that an online dynamic controller placement strategy that follows road traffic changes or react to some sudden or unexpected road events, should be used in an Software DefinedNetwork (SDN) based vehicular network
We explored the adaptive controller placement problem in a Software Defined Vehicular Netowrk (SDVN) context
Summary
A variety of emerging Intelligent Transportation Systems (ITS) services related to cooperative and automated driving are envisioned for the near future [1,2,3]. Most are expecting from the network strict performance requirements in terms of message transfer delay, reliability and bandwidth requirements [2,4]. The firmness of these requirements makes current wireless technologies unsuitable, and one possible research direction that is gaining adhesion is to consider a Software Defined. Communication) , etc.) vehicular network as the access network infrastructure to support these emerging services [5,6,7]. The ”logical” centralized control based on a thorough visibility of the network, combined with the fine-grained and programmable selection and forwarding treatments of flows, inherent to SDN, can bring a noticeable boost to the emergence of these services. The ability to reconfigure the network on the fly helps adapting network parameters to a given situation, for example, the transmission power can be adjusted based on the density and mobility of vehicles, in order to mitigate interference and improve network performance [9]
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