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Depending on whether bidirectional links or unidirectional links are used for communications, the network topology under a given range assignment is either an undirected graph referred to as the symmetric topology, or a directed graph referred to as the asymmetric topology. The Min-Power Symmetric (resp., Asymmetric) k-Node Connectivity problem seeks a range assignment of minimum total power subject...
In this paper we examine the combinatorial requirements of topology-transparent transmission schedules for channel access in mobile ad hoc networks. We formulate the problem as a combinatorial question and observe that its solution is a cover-free family. The mathematical properties of certain cover-free families have been studied extensively. Indeed, we show that both existing constructions for topology-transparent...
New technologies and the deployment of mobile and nomadic services are driving the emergence of complex communications networks, that have a highly dynamic behavior. This naturally engenders new route-discovery problems under changing conditions over these networks. Unfortunately, the temporal variations in the topology of dynamic networks are hard to be effectively captured in a classical graph model...
A mobile ad hoc network (MANET) is a dynamic wireless network that can be formed without the need for any pre-existing infrastructure in which each node can act as a router. One of the main challenges in ad hoc networks is the design of robust routing algorithms that adapt to the frequent and randomly changing network topology. Organizing mobile nodes into manageable clusters can reduce routing overhead...
Contrary to cellular networks, ad-hoc networks are a form of mobile networks that function without any fixed infrastructure. This paper proposes a method which improves routing success rates in mobile ad hoc networks. This method is based on the density of the nodes in the neighborhood of a route and on the availability of this neighborhood. The results obtained are encouraging: the data packet loss...
IVG is a GPS-based Inter-Vehicle Communication protocol used for alarm message dissemination among vehicles in a highway in risk situations. It is based on the principle of wireless ad hoc networks. In this paper, we propose an improvement to IVG towards supporting its interoperability in environments where vehicles “GPS-U” without GPS devices are present. It is also the case, because of obstacles,...
As ad hoc networks gain in popularity, some of their limitations are becoming apparent, notably power and bandwidth restrictions. Consequently, it is necessary to utilize protocols that reduce power consumption, reduce traffic, and restrict flooding. In this paper, two adaptive, connectionless protocols and their supporting subsystems are described. The protocols, when used with directional antennas,...
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