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The paper is devoted to logical implication of MANet's protocols for gateway discovery in IPv6 Wireless Sensor Networks (IPv6-WSN). We implement three approaches in NS-2 simulator and evaluate its performance under the specified field of the networks of gateway discovery. The performance results present the packet delivery ratio and delay of end to end communication networks. The AODV protocol is...
TCP protocol generally suffers from poor performance and network unfairness problems over multi-hop ad hoc networks. As designed for wired networks only, the legacy TCP always induces the over-reaction of network failure and hurts the quality of end-to-end connection in ad hoc networks. In this case, improvements have been proposed in the literature to help TCP to be aware of the different types of...
In ad-hoc networks, a communication link between two mobile computers is not always bi-directional, i.e. uni-directional, since transmission power of mobile computers are not the same. Though some ad-hoc routing protocols, e.g. Extended DSR (Dynamic Source Routing), support routing with unidirectional links, multiple flooding RREP are used and communication overhead is high. This paper proposes a...
In this paper, a new Rayleigh VANET model based on sum-of-sinusoids method (SoS) is presented. Some important statistical properties, such as variance of autocorrelation of the complex envelope and autocorrelation of the squared envelope are derived in detail. Furthermore, for above derived statistical properties, we give an detailed analysis about them by comparing their closeness between simulation...
There are many environmental factors taking effects on the communication performance of routing protocols.However, in high-density urban areas, one of the important factors is vehicle-node density. This paper proposes the vehicle- node density parameter to improve the performance of AODV routing protocol and OLSR routing protocol under two typical mobile models in VANET. The performance of routing...
Vehicular Ad hoc Network (VANET), as a subclass of mobile Ad hoc Networks (MANETs), is a promising approach for traffic security, mobile internet and V2V communication. While the packet loss estimation of VANET impacts routing protocol and transmission control algorithm, it turns out to be an important issue. In this paper, we propose an estimation algorithm for packet loss on VANET, RPLE (Real time...
Ad hoc network is one of the most common application areas of CR technology. This paper presented the design, implementation, and analysis of a novel pre-active Cognitive multi-channel routing protocol that utilizes multiple channels in mobile ad-hoc networks. A new node burden based metric is proposed to evaluate the effectiveness of candidate routes and a new channel switch metric is extended to...
Recently slotted protocols have been demonstrated to work also in a distributed way and in a vehicular scenario. In particular one of them, MS-Aloha, has shown interesting scalability features. Despite a comparative analysis between CSMA/CA (IEEE 802.11p) and MS-Aloha has already been proposed in a simplified topology, a deep analysis on the efficiency of the two protocols has not been achieved: in...
Connectivity is a fundamental requirement in the planning, design and evaluation of vehicular ad hoc networks (VANET). In this paper, we propose a new equivalent speed parameter and develop an analytical model to explain the effect of vehicle mobility on the connectivity of highway segments in a VANET. We prove that the equivalent speed is different from the average vehicle speed and it decreases...
With the development of recent vehicular communication technologies, distributing multimedia contents in the vehicular communication networks (VCNs) has become more and more popular, to provide conveniences and entertainment services during the time of driving. However, as multimedia contents are changed and updated dynamically, how to keep the consistency between the original and these replicas in...
Delay-constrained video applications have stringent bandwidth, delay and loss requirements, which is a great challenge to support such real-time applications in wireless ad hoc networks. In this paper, to minimize the distortion of video received at the decoder, we propose a cross layer design (CLD) approach which combines the network layer and MAC layer to meet the stringent requirements by dynamically...
The recommendation trust value is generally gotten by broadcasting request and collecting response from other nodes, so the results that returned by this method is uncertain and can't avoid being the malice recommendation. A new recommendation trust model is proposed in the paper basing on aggregate signature. The node trust values which include interactive node's signature are stored in local. When...
Mobile Ad hoc network is a self-organizing, multi-hop and wireless network. This kind of networking is convenient to construct because it is free of time and space and it can be constructed without infrastructure. It has been widely used on many occasions such as danger zones, military regions, hospital and family. Due to the dynamic changes of topology, Ad hoc network has its particularity of routing...
Caching of frequently accessed data in multi-hop ad hoc environment is a technique that can improve data access performance and availability. Cooperative caching, which allows sharing and coordination of cached data among several clients, can further enhance the potential of caching techniques. In this paper, we propose a fuzzy cooperative caching scheme in mobile ad hoc networks. The cache management...
With the advantages of asynchronous and loosely coupled communication model, the Publish/Subscribe system has been widely spread in large-scale distributed mobile networks. According to the MANET's characteristics of dynamic topology and bandwidth-constraint, we propose an application scheme of Publish/Subscribe system over clustering MANET. We improve the cluster header by adding the Information...
In this paper, we propose a trust opinion aggregation scheme in vehicular ad-hoc networks, to support trust models used to evaluate the quality of information shared among peers in the environment. Our scheme extends an existing identity-based aggregate signature algorithm to correctly combine signatures for multiple messages into one aggregate signature and eliminate signature redundancy. As a result,...
Vehicular ad hoc networks (VANETs) are an extreme case of mobile ad hoc networks (MANETs). High speed and frequent network topology changes are the main characteristics of vehicular networks. These characteristics lead to special issues and challenges in the network design, such as in medium access control (MAC). Due to the high speed and frequent network partitions, it is difficult to design a MAC...
In many adverse or dangerous application environments, parameters in path loss model for wireless channel are unknown, and neighbor nodes are unable to range using RSSI. Forcing on this kind of environment, a localization algorithm based on Particle Swarm Optimization and the mobile anchor in sensor networks is proposed in this paper. Localization process is converted into non-linear constraint optimization...
Although establishing stable routes for routing can improve the performance of mobile an hoc networks (MANETs), the improvement will be weakened to a degree for the stability of route is sensitive to the motion of node. In this paper, based on a basic stability-oriented routing scheme, named FORP, we involved two mobility-adaptive mechanisms in it. One mechanism is the real-time update of stability...
The routing behavior of Mobile Ad Hoc Network is a kind of cooperation model in multi mobile nodes. The traditional routing methods cannot solve the problem of malicious behavior and build the trusted transfers route between nodes. Based on the character of trust routing, the subjective confidence for the routing behavior has transform into trust evaluation with the probability model to solve the...
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