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The Vehicular Ad Hoc Networks (VANETs), as an important part of intelligent transportation systems (ITS), has been becoming a promising research area. Due to the high mobility of vehicles and intermittent connected topology resulting in the dramatically changing network topology, it is difficult to design a protocol including congestion control mechanism, which is helpful for a well network performance...
Named Data Networking is a new data centric kind of communication network. This paper shows the study about NDN network and applies this architecture over Vehicular ad-hoc networks so that performance of network improves and communication becomes faster. At the end of simulation results are discussed in the form of packet delivery ratio, throughput, good put, routing overhead and various network parameters...
We present a simulation-based study of the impacts of channel switching overhead on the performance of multicast in multi-channel multi-radio wireless mesh networks (MCMR WMNs). We study how channel switching overhead affects the performance metrics such as packet delivery ratio, throughput, end-to-end delay, and delay jitter of a multicast session.
Due to the rapid growth of Software-Defined Networks, we can manage network traffic easier than before. One of the major issues on SDN is the multipath routing protocols due to its complexity of optimum path selection among the multiple routes. In this paper, we focus on Multipath TCP (MPTCP). MPTCP is an extension of TCP that increases the throughput of TCP communication significantly by utilizing...
This study presents the effect of residual energy of nodes in Wireless Sensor Networks (WSNs). There are many issues and challenges that still need to be solved in this area especially for energy contrain. This factor considered during clustering and routing approached to maximize network lifetime. To prolong network lifetime, there is a need for efficient power control mechanisms to reduce power...
Wireless Sensor Network (WSN) is consisting of independent and distributed sensors to monitor physical or environmental conditions, such as temperature, sound, pressure, etc. Routing protocols represent an essential aspect of the performance of mobile wireless networks. This paper presents a comparative analysis between several routing algorithms and their impact on the performance of WSN. The performance...
In cognitive radio (CR) networks, unlicensed users (or secondary users, SUs) can explore and exploit white spaces, which are the underutilized licensed channels, conditional on acceptable interference to the licensed users (or primary users, PUs). This paper investigates the effects of network characteristics on the network performance of a routing scheme called Cognitive Radio Q-routing (CRQ-routing),...
Lack of global knowledge in a delay tolerant network proves detrimental, for a replication based routing strategy, in terms of resource utilization. It has often been noticed that nodes keep on replicating a message although it has already been delivered to the destination since such information remains unknown to most of the nodes in the network. Moreover recovery mechanisms (like VACCINE for epidemic...
This paper proposes an efficient network coding aware opportunistic routing mechanism (CoAOR) for wireless mesh networks (WMNs). A new coding gain function is proposed for forwarder selection, which takes into account the number of flows considered in an encoded packet, the link quality, and the number of nodes that are able to decode an encoded packet. The weights of the three parameters in the function...
We have proposed a memory sharing method of the wormhole routed network-on-chip architecture. In our method, a memory is shared between multiple physical links by using the multi-port memory. We evaluate and discuss the communication performance in the various situations. It is shown that the minimum number of memory banks required in multiport memory for 2D-torus and 2D-mesh networks is 8. Our proposed...
State-of-the-art supercomputers are increasing the number of computing nodes to meet unlimited requirements of computation. Developing efficient interconnection networks that are responsible to communication features is one of the most crucial issues. However, many researches face problems in simulating large-scale interconnection network to estimate the communication performance. This paper is to...
Localized network coding can greatly improve the throughput of wireless mesh networks. In a typical practical wireless transmission mechanism using localized network coding, such as COPE, to make decision which forwarding packets should be coded together, each node needs to broadcast a notification message every τ interval time to inform their neighbors which packets they have buffered...
In this paper, we investigate the performance of OLSR and AODV protocols in a Manhattan grid scenario when sending triple TCP flow over FTP. We considered data rates of 0.1 Mbps and 1 Mbps. For the simulations, we used SUMO and NS3. We considered IEEE 802.11p standard and TwoRayGroundPropagationLossModel. We use through-put and cwnd as evaluation metrics. The simulation results show that for small...
There is an increasing interest in Mobile Ad hoc Networks (MANETs) for their potential use in several fields such as collaborative computing, tactical networks and multimedia communications. Thus, MANETs need to support multiple communication flows in the network, while guaranteeing a good performance. In this paper, we analyze the performance of a MANET by simulations, considering multiple flows...
In this paper we propose a fuzzy based routing algorithm in which the link cost are dynamically assigned using a fuzzy system. Based on a set of fuzzy rules, link cost is dynamically assigned depending upon the current condition of the network. The proposed fuzzy scheme determines the integrity of a link given the current congestion state calculated via the delay experienced in the network and the...
As Mobile Ad hoc Networks (MANETs) are attracting attention for their potential use in several fields such as collaborative computing and multimedia communications, there is an increasing need to minimize the overhead introduced by routing protocols in the network. In this paper, we analyze the performance of a MANET by simulations, in terms of RREQ, RREP and RERR, considering Random Waypoint Mobility...
In this paper, we investigate the performance of OLSR and DSDV protocols in a highway VANET scenario. The mobility patterns of vehicles are generated by means of CAVENET (Cellular Automaton based Vehicular Network). As communication protocol simulator, is used NS3 (Network Simulator 3). The simulations are done for four different scenarios based on nodes ID. We use Throughput and Packet Delivery Ratio...
MANETs are temporary networks, that spend less time to be deployed and less resources to keep up and running. MANETs can be implemented in disaster recovery sites, university campuses, military campaigns and so on. MANET nodes cooperate in an autonomous way by forwarding packets to each-other. Considering mobility of the terminals, the routes change dynamically so routing algorithms are very important...
In this paper, a novel cognitive engine for Wireless Sensor Networks (WSN) is proposed in order to achieve its end-to-end goals. This engine is designed using the tool known as Weighted Cognitive Maps (WCM). WCMs have the advantage of being able to consider multiple conflicting objectives and constraints with low complexity. Their inference properties also allow them to resolve complex network interactions...
In recent years, Optimized Link State Routing (OLSR) protocol receives widespread attention due to its relatively less routing overheads and good routing performance. Since the mobility of nodes and flexibility of the topology are the principal features of ad hoc network, it is necessary to study the impact of these features on the performance of the network. In this paper, we propose a novel scheme...
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