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Mobility of nodes is considered as the potential solution for improving Ad Hoc network performance, such as maintaining a specified network topology, improving the power efficiency, and enhancing signal-to-noise ratio at the receivers, etc. However, node movement consumes certain amount of energy, which is limited at nodes, and should be counted when optimizing the system performance. In this paper,...
The topology of a delay tolerant network (DTN) over time has been modeled by a space-time graph. However, the mobility of nodes, such as buses, may not be completely predictable due to factors such as traffic load, road condition, the number of passengers getting on and off the buses, and the operations of traffic lights. In this paper, we adapt the space-time graph by augmenting each horizontal edge...
In proactive routing protocols (such as OLSR) nodes flood their neighborhood information to the entire network. Every node then constructs a topology map which represents its view of the network. This map is taken as a basis to compute the ??best?? path to the destination. Inaccurate topology information may result in one of the following: a) packets may be sent in a path that no longer exists; b)...
This paper presents the implementation and evaluation of a distributed topology management algorithm for public safety networks (PSNs) to implement the CHORIST architecture. Topology management for this kind of network is a mission critical problem, for a mission critical network. PSNs are the networks installed by the authorities to coordinate relief/rescue efforts in case of disasters. The main...
The performance of mobile ad hoc networks (MANETs) is influenced by many factors including node mobility, node density, and wireless transmission range. The dynamics induced by these factors along the paths between MANET nodes affect node connectivity. Research efforts aiming at quantifying such path dynamics are limited (1) considering only the impact of a small number of factors, mostly node mobility;...
In this paper, an approach for topology control has been proposed which make use of distance estimation and angle of arrival (AoA) estimation techniques. Every node in the network tries to keep the number of its neighbors to 4 or 3. These neighbors have been selected from the nearest neighbors of each node and are located in different four quarters of axis. The angular difference between these neighbors...
In this paper we examine the behavior of ad hoc networks through simulations, using different routing protocols and various topologies. We examine the difference in performance, using a CBR application, with packets of different size through a variety of topologies, showing that the way nodes are placed in a network has an impact in networks performance. We show that the choice of routing protocol...
A mobile ad hoc network (MANET) is a collection of mobile hosts forming a temporary network on the fly, without using any fixed infrastructure. Characteristics of MANETs are thus a lack of central coordination, the mobility of hosts and a dynamically varying network topology. A multi-hop wireless ad hoc network is considered, where all nodes share a common channel and code division multiple access...
In wireless ad hoc networks, nodes are energy constrained. As they communicate far off destinations using intermediate relays, it may not be in interest of a node to expend its energy in relaying and consequently reducing its own lifetime. On the other hand, if all nodes decide not to always accept relay requests, the network throughput will drop dramatically i.e., the lifetime of the whole network...
A major problem with the on-demand routing protocols for MANETs is the high cost flooding associated with route discovery process. Amongst many different optimizations for the pure flooding, the simple epidemic algorithm that emulates the spread of an infection in a crowded population, is one of the promising approaches. Based on the observation that phase transition phenomenon occurs under the relatively...
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