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Next generation of wireless broadband network such as WiMAX MMR networks and LTE Advanced support high quality multimedia services with high data transmission rate. Most of the current broadband operates at high frequency and thus has limited transmission range. Multi-hop relaying technology is seen as an efficient solution that could enhance coverage and improves system capacity. However, overall...
High transfer rate between the nodes is the key to the high-speed mobile ad hoc networks, the factors as the node's transmit power control, the overall energy consumption, the network lifetime can be ignored. So firstly, analyzing the forward and backward packet receiving rate, then establish the required number of expected sending packets model ETX. Finally, comparing the flood routing and multi-hop...
In delay tolerant networks (DTNs), power management will likely play a critical role in the system design. Because these networks are partitioned in nature, mobility is typically required for data routing. Since nodes must physically move to create links, there can be significant routing delays, and the network must be alive for a long enough time to be of any practical use. Therefore, a power management...
Reciprocity-based cooperation on packet relaying in mobile ad hoc networks discourages nodes from behaving selfishly. Before passing on a packet to the next hop a node verifies whether the sender of the packet is trustworthy (cooperative) or not. The quality of the evaluation of the trustworthiness relies on types of data used for description of the behaviour of the sender. In the literature a distinction...
The concept of Ad-hoc mobile networks that support multi-hopping has been around for some time now. However, making sure that such decentralized networks are completely self-organizing is not a trivial task and raises various issues relating to network management, routing, interference, etc. We have built a software SONIR (Self-Organizing Network with Intelligent Relaying), in MATLAB, which implements...
An important problem in Wireless Sensor Networks (WSN) is the occurrence of failures that lead to the disconnection of parts of the network, compromising the final results achieved by the WSN operation. A way to overcome such problem is to provide a reliable connection to support the connectivity via other types of nodes that communicate with the sensor nodes. This paper proposes the usage of a network...
The analysis of temporal connectivity graphs associated to real mobility traces in structureless Delay Tolerant Networks (DTN) has revealed the existence of a portion of nodes, called hubs, appearing frequently in optimal paths connecting arbitrary node pairs. Based on these findings, hub-based routing has become one of the most promising strategies in order to successfully deliver messages in DTNs...
In this paper, we propose an incentive system to stimulate the nodes' cooperation in multi-hop wireless networks. Reducing the number and the size of the payment receipts is essential for practical implementation of an incentive system due to the high frequency of low-value transactions. First, the receipts' number is reduced by generating one fixed-size receipt per session instead of generating a...
In this study we propose two novel ABR extended Long Life Routing Methods called Alternative enhancement for Enhanced Associativity Based Routing (AEABR) and Associativity Tick Averaged ABR (ATAABR) methods which are also modifications of Associativity Based Routing (ABR). Comparison of these associativity based long Life routing algorithms in Mobile Networks are done for route speeds, life times...
The limited lifetime of batteries and the bandwidth limitation of channels are the major issues in Ad-hoc networks. The term Congestion is usually associated with the bandwidth issues. The bandwidth keeps varying and when there is insufficient bandwidth to satisfy the demand, we say we have a congestion problem. Congestion control methods are partially implemented in the network elements (e.g.: routers)...
Multi-Point Relaying (MPR) is a well-known relay pruning algorithm that has proved to be useful for efficient dissemination in Mobile Ad hoc Networks (MANETs). But this technique may be useful for other tasks in MANET link-state routing as well. In particular, the approach is attractive for the selection of topology information to be flooded across the network. Requirements for such topology selection...
We study the optimal control of propagation of packets in delay tolerant mobile ad-hoc networks. We consider a two-hop forwarding policy under which the expected number of nodes carrying copies of the packets obeys a linear dynamics. We exploit this property to formulate the problem in the framework of linear quadratic optimal control which allows us to obtain closed-form expressions for the optimal...
The term Organic Computing is that the system you used having the Self-X properties and autonomously. Self-organization and self-configuration will be automatically performing some mechanisms after system constructed. Self-healing when the mal-function operates or damaged the system. Self-optimization when system found a way that could be better than it is now. And context-aware is that when the working...
In partially connected ad hoc networks (PCANETs), the whole structure is partitioned into several unconnected regions. To address the communication problem between these regions, an on-demand routing technology based on task-relay (OR-TR) is proposed. Single or multiple task-relay nodes are adopted to act as the special communication medium in PCANETs. Simulations have been conducted to study the...
Recently, there are many researches about a trace-back method which specifies the source of transmitted packets in mobile ad-hoc network. In ad-hoc network, since there is no fixed infrastructure, each node has to record the traceback information and reconstruct the trace-path by itself. In conventional researches, since traceback is handled by each node, the variation of network topology by mobility...
A new routing mechanism for intermittently connected mobile networks is presented in this article. Due to high mobility, it is difficult to maintain a reliable path in intermittently connected mobile networks. In order for data transmission among nodes, the flooding-based routing methods were commonly used. Although the deliver ratio can be increased, it exhausts too much network resources. The proposed...
Higher-powered relay nodes have been proposed as cluster heads in hierarchical sensor networks to increase the network connectivity, coverage and lifetime. Determining an appropriate placement scheme of the relay nodes that ensures adequate coverage and connectivity, while using a minimum number of relay nodes, is an important design problem and a significant amount of work has been done in this area...
This paper studies optimal relay-based multicast routing to improve throughput in multirate-aware MANETs. The main idea is trying to replace a lower rate transmission of upstream node with some higher rate transmissions by relay nodes to minimize the total transmission time of the upstream node and relay nodes. Firstly, we formulate this problem as an optimization problem and prove that it is NP-hard...
We present an algorithm for data delivery to mobile sinks in wireless sensor networks. Our algorithm is based on information potentials, which we extend to account for mobility. We show that for local movement along edges in the communication graph, the information potentials can be adapted using a simple iterative distributed computation. However, for non-local movement, the potential field might...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
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