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We propose the Floating Ground Architecture (FGA) for network mobility and ad hoc network convergence. Various factors, including excessive dependence on intelligence in the fixed network, result in the Internet having a de facto logical boundary one hop from the fixed network. To reduce these dependencies, FGA introduces a new logical layer, called Floating Ground, between the fixed network infrastructure...
When stricken by a large-scale disaster, the efficiency of disaster response operation is very critical to lifesaving. However, communication systems, such as cellular networks, usually crashed due to various causes making coordination among disorganized disaster responders extremely difficult. Unfortunately, rapid deployment of many existing emergency communication systems relies on a good transportation...
When stricken by a large-scale disaster, the efficiency of disaster response operation is very critical to lifesaving. However, communication systems, such as cellular networks, usually crashed due to various causes making coordination among disorganized disaster responders extremely difficult. Unfortunately, rapid deployment of many existing emergency communication systems relies on a good transportation...
How to measure and maintain connectivity is an important issue in ad hoc networks. A special case of such network is Wireless Sensor Networks (WSN), which are often deployed in harsh environments and also susceptible to a number of problems that may negatively affect the connectivity among the nodes. An additional factor that increases the cost of connectivity maintenance in ad hoc networks is when...
A wireless ad-hoc network is an autonomous system of wireless routers, fixed or mobile those communicate with each other via radio links without the support of any fixed wired infrastructure. In such a topology, communication is achieved by use of multiple hop paths between the sender and the receiver. Wireless ad-hoc networks constitute a typical paradigm of networks whose performance and operability...
Under the network environment, the Network topologies will change which leads to the changes of the routes for the moving characteristic of the nodes. We analyze the effects on TCP RQB caused by the changes of the routes in AD hoc and present the modified methods for TCP RQB, which is called TCP RQB-R, on the basis of the theory above. By identifying dynamically the changes of routes in the method...
In dynamic wireless networks, effective modeling on link behavior would lead the network protocol design towards a predictive and reasonable way. Emerging mobile ad hoc network (MANET), however, is of self-organizing and infrastructureless paradigm, where topology dynamics are highly related to many complicated parameters, such as node density, mobility model, and transmission range etc, which make...
Wireless Sensor Network is an adhoc network having nodes with constraints like less memory and processing capability. Nodes work without knowledge of their position in the network. After random deployment of nodes, some of the nodes are in critical position as they connect one group of sensor nodes to another. If these nodes are removed from the network it may lead to partitioning of network. Most...
Data replication is an effective way to improve data accessibility in ad hoc networks because of the movement of hosts and the changing of network topology. A new data replication method called Hierarchical Replication Model (HRM) is proposed in this paper. This method selects mobile hosts as data replicas holders taking into account not only data access frequencies and network topology, but also...
Wireless sensor networks are low cost networks constituted by modest devices with limited resources, whose main function is monitoring. Based on the low price of these devices, it will be cheap to deploy a large amount of nodes to monitor a large area. However, to provide an efficient ad hoc network using these limited devices, new and optimized algorithms should be proposed. Most of the current work...
Formation control is essential for an underwater mobile sensing network (UMSN), an ad hoc network which wirelessly connects underwater vehicles of sensing and/or observing types via acoustic communications, to fulfill mobile sensing tasks. The problem of formation stabilization for an UMSN with varying communication topology is studied in this paper. Sufficient condition of formation stability is...
Link topology lifetime is not only an important metric to evaluate the dynamic characteristic of ad hoc network, but also is a direct and effective method to determine the time to perform ad hoc network measurement. This paper introduces the concept of ldquosnapshotrdquo to take the picture of link topology of three classical mobile mobility (i.e., RPGM, Freeway and Manhattan) respectively. Simulation...
MANET as a new type of mobile wireless networks, its unique characteristics increase the difficulty of the management, in particular, the movement of nodes require more effective management of topology, which nearly pose a challenge. Thus, with the analysis of characteristic and application requirements of the ad hoc network, a new type of clustering algorithm is proposed based on energy which mainly...
An ad hoc network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. The multipath routing in mobile ad hoc networks is difficult because the network topology may change constantly, and the available alternative path is inherently unreliable. A number of routing protocols like ad hoc...
This paper proposes a localization algorithm that can be used to track and locate multiple mobile subjects in a wireless ad hoc network. An algorithm called adaptive dynamic localization is proposed. It is based on a dynamic multidimensional scaling (DMDS) method which reduces the localization error by adding virtual nodes till the network turns adequately dense and connected. The shortcomings which...
The following topics are dealt with: IP network security; wireless security; network topology; power line communication; intelligent transportation; cryptography; P2P streaming; wireless communication; wireless channel; network traffic; routing protocol; security protocols; resource management; ad hoc network; wireless sensor network; MAC protocol; power control; QoS; scheduling; coding; modulation;...
Engineers have proposed lots of mechanisms for providing secure communications in ad hoc networks since the early 1990s. Due to the absence of fixed infrastructure, ad hoc networks are more vulnerable when encountering security threats than conventional wireless networks. The mobile ad hoc network can be considered as a short-lived collection of mobile nodes that communicate with each other. All involved...
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