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The coupling of scale-free networks with mobile unstructured networks is certainly unusual. In mobile networks, connections active at a given instant are constrained by the geographical distribution of mobile nodes, and by the limited signal strength of the wireless technology employed to build the ad-hoc overlay. This is in contrast with the presence of hubs, typical of scale-free nets. However,...
Packet forwarding in a multihop wireless network is always prone to jeopardy by the selfish behavior of participating nodes striving to save scarce energy resources. There are many mechanisms which offer appealing incentives to a node in order to instigate cooperation. These incentives are rather unnatural or in some cases the nodes are allured to adapt a tempered proof policy. In this paper, a natural...
Cooperative communication can significantly enhance transmission reliability and bandwidth efficiency in wireless networks. Most existing works are focused on physical layer issues of cooperative communications. Many upper layer aspects of cooperative communications merit further research. In this paper, we investigate its impacts on network topology and capacity. Specifically, we present a novel...
We study the minimum cut between one source and one terminal in a dynamically changing random wireless ad hoc network that is modeled as a random geometric graph. The nature of ad hoc networks is accounted for by letting nodes join and leave. Given the values of all cuts that can be formed in the original network and assuming information about the nodes that join or leave, expressions for the expected...
Delay-tolerant networks are especially useful in providing mission-critical services including emergency scenarios and battlefield applications. However, DTNs are vulnerable to wormhole attacks, in which a malicious node records the packets at one location and tunnels them to another colluding node, which relays them locally into the network. Wormhole attacks are a severe threat to normal network...
A node in a wireless sensor network typically consists of a micro-controller, a communication device or transceiver, and a battery unit for powering the transceiver and other devices. An important feature of wireless sensor networks is the low power consumption requirement, since these sensor nodes carry generally irreplaceable power sources or batteries. We consider the problem of assigning a power...
Streaming applications will rapidly develop and contribute a significant amount of traffic in the near future. A problem, scarcely addressed so far, is how to support streaming traffic in vehicular networks (VANETs). This problem significantly differs from previous work on broadcast and multicast in ad hoc networks, because of the highly-dynamic topology of VANETs and the strict delay requirements...
The network-centric future force must support a large and diverse group of communication nodes. While much network design in networks such as future combat systems (FCS) and warfighter information network- tactical (WIN-T) can be done using existing TCP/IP protocols, there are important performance limits when the network conditions become more extreme (e.g., highly mobile or dense). A solution for...
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