The centralized architecture in software-defined network (SDN) provides a global view of the underlying network, paving the way for enormous research in the area of SDN traffic engineering (SDN TE). This research focuses on the load... more
The centralized architecture in software-defined network (SDN) provides a global view of the underlying network, paving the way for enormous research in the area of SDN traffic engineering (SDN TE). This research focuses on the load balancing aspects of SDN TE, given that the existing reactive methods for data-plane load balancing eventually result in packet loss and proactive schemes for data plane load balancing do not address congestion propagation. In the proposed work, the SDN controller periodically monitors flow level statistics and utilization on each link in the network and over-utilized links that cause network congestion and packet loss are identified as bottleneck links. For load balancing the identified largest flow and further traffic through these bottleneck links are rerouted through the lightly-loaded alternate path. The proposed scheme models a Bayesian Network using the observed port utilization and residual bandwidth to decide whether the newly computed alternate path can handle the new flow load before flow admission which in turn reduces congestion propagation. The simulation results show that when the network traffic increases the proposed method efficiently reroutes the flows and balance the network load which substantially improves the network efficiency and the quality of service (QoS) parameters.
In this paper, we will focus on the performance evaluation of a vehicular mobility scenario graph. Indeed, we will analyze the performance metrics (throughput, packets loss and end to end delay) using the IEEE 802.11p standard of the... more
In this paper, we will focus on the performance evaluation of a vehicular mobility scenario graph. Indeed, we will analyze the performance metrics (throughput, packets loss and end to end delay) using the IEEE 802.11p standard of the proposed mobility graph. In addition, we examine the impact of the packet length, vehicle speed and routing protocols (Ad-Hoc On-demand Distance Vector " AODV " , Destination Sequenced Distance Vector " DSDV " and DumbAgent). Our simulations are based on the networks simulator " NS-2 " and the mobility simulator " VanetMobisim " to evaluate the performance of the vehicular ad hoc network.
Wireless Mesh network (WMN) is dynamically self-organizing and self-configured, with the nodes in the network automatically establishing an ad-hoc network and maintaining the mesh connectivity. The ability to use multiple-radios and... more
Wireless Mesh network (WMN) is dynamically self-organizing and self-configured, with the nodes in the network automatically establishing an ad-hoc network and maintaining the mesh connectivity. The ability to use multiple-radios and multiple channels can be cashed to increase aggregate throughput of wireless mesh network. Thus the efficient use of available interfaces and channels without interference becomes the key factor. In this paper we propose interference aware clustered based channel assignment schemes which minimizes the interference and increases throughput. In our proposed scheme we have given priority to minimize interference from nearby mesh nodes in interference range than maximizing channel diversity. We simulated our proposed work using NS-3 and results show that our scheme improves network performance than BFSCA and Distributed Greedy CA.
