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Unreliable wireless links can cause frequent link (and route) failures, creating a major challenge for routing protocols who need to constantly repair routes and find alternate paths. In this paper we propose DADR (Distributed Autonomous Depth-first Routing), a new distributed distance-vector routing protocol designed to adapt quickly to changing link conditions while minimizing network control overhead...
Ad hoc mobile networks are composed of mobile nodes communicating through wireless medium, without any fixed backbone infrastructure. In these networks, Congestion occurs in any intermediate nodes when data packets travel from source to destination and they incur high packet loss and long delay, which cause the performance degradations of a network. This paper presents the early detection congestion...
We focus on the problem of efficient dissemination of available gateways information throughout a Vehicular Ad-hoc Network (VANET). Contrary to previous works, we also consider how the gateway discovery protocol affects user data flows that are routed to the infrastructure network. The cases of both delay-tolerant and delay-constrained user traffic are studied. We propose two schemes targeted at reliable,...
The possibility of connecting vehicles to fixed IP networks through roadside units (RSUs) or even access gateways is seen as a very interesting alternative to fully infrastructure-less VANETs. However, getting access to those fixed networks must be controlled and only authorized users should be able to use those RSUs or gateways. However, that authentication process incurs in a not-negligible delay...
Providing quality of service (QoS) to the passengers is extremely challenging due to the dynamic nature of the environment in which they operate and their own behaviour. With the regular arrivals and departures of flights, passenger flow tends to continuously change making it more difficult to maintain the required QoS. For this purpose, there is a need to study a complete architecture based on both...
A Wireless Sensor Network (WSN) consists of programmable, low-cost and resource-constrained nodes. Adding new features or error fixes requires reprogramming nodes. Manually reprogramming hundreds or thousands of nodes is impractical as it takes significant effort and time. Therefore, WSNs require a mechanism for updating the nodes program image, which contains the applications and protocols running...
A challenge in the convergence of heterogeneous networks is how to combine the ubiquitous resources and provide the diversified individual services. By this, the vision of adaptive and context-aware service provision becomes possible and offers new opportunities for pervasive computing. In this paper, we describe an approach that addresses the convergence of wireless personal area and wide area networks...
Due to its ad hoc, infrastructure-less self-configuring and collaborating nature, wireless sensor networks (WSNs) are very much vulnerable to different security threats. The goal-oriented nature of many sensing applications results in collaboration. In fact, collaboration helps to improve WSNs efficiency as well as the data-centric behavior of WSNs. Collaboration along with its advantages like efficient...
Joint Probabilistic Data Association (JPDA) technique can be applied for locating and tracking the radiated sources in dynamic and ad hoc wireless sensor networks. Vice versa, the located sensor nodes in the network can help mapping the indoor environment connected by their RF communication links. However, the sensed information may be corrupted by the clutter (ambient noise and RF interference) that...
This paper analyzes a routing protocol for Mobile Ad hoc Network (MANET), which is called Hierarchical Optimized Link State Routing (HOLSR) protocol. According to the structure of the routing system under the Linux OS, we focus on the design of system architecture and the implementation of functional modules. This gives a reliable scenario to test the real performance of HOLSR protocol and hence help...
As MANET has characteristics like multi-hop wireless connection, dynamic topology, and limited bandwidth, its routing protocol faces great challenges. This paper briefly introduces the concept and characteristics of MANET. It puts an emphasis on the key technologies (wireless resource management technology, space interface theory technology, routing technology, Internet access technology, address...
Wireless Mesh Network is mainly used to obtain Internet access, so most of the traffic converges to gateways. Due to the nature characteristic of WMN traffic model, gateways unavoidably become the bottleneck of the whole network. An anycast-based gateway selection model was proposed in this paper to solve the gateway selection problem. In this model, all the gateway nodes were abstracted as an anycast...
Wireless Mesh Network is a new broadband wireless network structure, That is, a high-capacity, high-speed distribution network, It is different from traditional wireless networks, can be seen as the integration of wireless LAN and mobile Ad hoc networks, and it played both advantages, is a wireless version of the Internet. Wireless Mesh networks are gradually expanding into the civilian commercial...
Congestion control is an important research area in wireless mesh network(WMN). In order to solve congestion control in WMN, a random routing algorithm based on path weights (WA) is presented. The algorithm adopts multi-gateway wireless mesh network routing protocol to solve the congestion problem of single gateway. And anycast service was used to ensure the successful rate of service requests. Simulation...
Currently there are a range of digital devices and the trend is moving us closer to an increasingly interconnected world. However one of the current limitations is that device usage is location dependent. For example, when you are in your home environment and your PDA, which contains MP3s, resides in your work environment, there is no mechanism to enable you to use the functionality it provides. Mechanisms...
In this paper, we proposed a three-layer dynamic gateway strategy, which integrates mobile IP and AODV protocol. This is one kind of multi-gateway mechanisms. By using irregular nodes not attached fixed gateway as gateway in Ad Hoc network, network overload will decreased. And the efficiency of the network will increased. According to the distance, the registered number of nodes and traffic-weighted...
We have been experimenting with Anoto-Pens to immediately monitor the progress of all students during a lecture. In our previous experiments, the teacher had to determine, in advance, the mapping between student seat positions and his/her digital pen IDs. To resolve this issue, we propose an instant seat-mapping method utilizing student signatures. When a student writes his/her name on a mapping sheet,...
The network in case of Mobile Adhoc networks is generally poorly defined or not defined at all. In Such a network the data can be relayed/routed by intermediate nodes whose position keeps on changing. Mobile adhoc networks have some challenges like Limited wireless transmission range, broadcast nature of the wireless medium, hidden terminal and exposed terminal problems, packet losses due to transmission...
Attacks on ad hoc network routing protocol affects network performance and reliability. Epidemic routing protocols are based on message flooding in the network which results in large number of lost messages. In this paper, we present a secure minimized dominating set routing protocol for mobile adhoc network based on delay tolerant network. In the proposed model, the route selection is based on concept...
A Mobile Ad hoc Network (MANET) is made up of mobile nodes that communicate through wireless connections, without any existing infrastructure or central administrator. Topology of the network is not fixed. Hence, routing in dynamic network is a new challenge. Nature-inspired algorithms (swarm intelligence) such as Ant Colony Optimization algorithms have shown to be a good method for expanding routing...
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