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We explore the multicast lifetime capacity of energy-limited wireless ad hoc networks using directional multibeam antennas by formulating and solving the corresponding optimization problem. In such networks, each node is equipped with a practical smart antenna array that can be configured to support multiple beams with adjustable orientation and beamwidth. The special case of this optimization problem...
Supporting multimedia for Mobile ad hoc networks (MANETs) is an important issue. This paper presents two routing algorithms in MANETs inspired by the ant colony optimization routing algorithms. The first algorithm is a Hybrid Multi-Ant (HMAnt) routing algorithm. It is a hybrid since it combines reactive path establishment with proactive path maintenance. It supports multi-path while maintaining an...
In object tracking wireless sensor networks, communication overheads affect the accuracy of tracking localization seriously. Existing seminar works suffer from lacking of adaptively on various accuracy requirements, which lead to large amount of network traffic. In this paper, we propose a coordination mechanism based on joint mobility prediction method between sink node and sensor node, as to meet...
Conformance testing is crucial to the quality and reliability of routing protocols for pervasive communications. Most of the works are devoted to their simulations in order to study their performance in a simulated context without taking into account their formal requirements and specifications. Our work tackles the formal methods to test the conformance of a ad hoc routing protocol (i.e. OLSR) deployed...
In ubiquitous wireless environment, mobile devices need a more resilient and convenient network communication software. Mobile ad hoc network (MANET) routing protocols are favored in ubiquitous environments due to its self-organization and self-reconstruction characteristics. Routing protocols however, especially the MANET routing protocols, are suffering from the unexpected topology changes and unreliable...
Delay Tolerant Networks (DTNs), in which contacts between nodes come and go over time, is a promising approach to model communications in mobile ad-hoc networks, where scenarios of network partitioning and node disconnections are likely to happen. One of the most important challenges in such networks is how to route information and schedule transmissions, coping with the continuously changing network...
A cross-layer modification to the DSR protocol is presented in this work which is intended to enhance the global throughput performance of wireless mesh networks. This modification involves the use of an access efficiency factor (which is a measure of the local availability of bandwidth at a node) as an alternative metric to the hop-count metric in order to allow for improved routing selection. The...
The inexpensive tiny wireless sensor can be embedded in devices to enable any commercial application, but are prone to intruder attacks. Due to the limited resource constraint in wireless sensor network, security in protocols is sacrificed or kept minimal. The distributive and self-organizing nature of sensor based on environment requires protocol to be adaptive, energy efficient and secure. In this...
Routing, the act of moving information across an Internet work from a source to a destination is one of the major issues in computer network literature. When it comes to mobile ad hoc network, the complexity increases due to various characteristics like dynamic topology, absence of centralized authority, time varying QoS requirements etc. The biggest challenge in this kind of networks is to find a...
Energy saving and traffic load balancing are two important issues that affect the performance of wireless networks, especially MANET. In this work, a novel routing algorithm over MANETs called LBE-ARAMA has been proposed. It allows to discover minimum MDR paths preserving the energy and to balance the data traffic through the round trip time (RTT) delay evaluation on the path from source to destination...
Routing is a challenging task in mobile adhoc network due to nodal mobility, unstable links and limited resources. Swarm intelligence, as demonstrated by biological swarm, such as ant colony has found to be a attractive technique for routing in MANET. However existing swarm intelligence based routing protocols find an optimal path by considering only one or two route selection metrics, such as hop...
Directional antennas widely used in IEEE 802.11 series protocols can offer high gain and low interference to other stations. But they also cause some side effects like the hidden terminal and deafness problems, which will deteriorate the performance of the networks significantly. Therefore, omni-directional antennas have to be used in some cases to avoid these problems. So a station equipped with...
The rapid expansion of wireless sensor networks technology has created an unprecedented opportunity to gather and extract information from wireless sensor networks. How to gather sensed information in energy efficient way is critical problems recently. Clustering technique has been proven to be an effective approach for data-gathering in wireless sensor networks. However, in a mobile environment,...
Wireless ad hoc networks often require a method for estimating their nodes' locations. Typically this is achieved by the use of pair-wise measurements between nodes and their neighbours, where a number of nodes already accurately know their location and the remaining nodes must calculate theirs using these known locations. Often, a linear least squares solution, or a maximum likelihood estimate (MLE)...
A mobile ad-hoc network is a set of mobile nodes that communicate with each other through the airwave. These networks have a high flexibility and have no central infrastructure or supervisor. In this type of networks, the topology is in change always, and the important problem in them is finding the path between source and destination. In this paper, we introduce a multi path hybrid routing algorithm...
One particular challenging environment for multicast is a mobile ad-hoc network (MANET). Existing studies show that tree-based and mesh based on-demand protocols are not necessarily the best choice, since associated overhead will be more. Several algorithms based on the ant colony optimization (ACO) approach minimizes the cost of the tree under multiple constraints. These algorithms treat the traffic...
As a fundamental operation of wireless ad hoc networks (WANET), broadcast has been widely studied in the past ten years. However, most existing broadcasting strategies assumed non-sleeping wireless devices. Little attention has been paid to broadcast in WANETs with sleeping schedule, which is a promising power-saving method in wireless networks. In this paper we study the sleeping schedule aware minimum...
Normally, for an on-demand routing protocol in mobile ad hoc networks, the parameters that ought to be optimized include end-to-end delay and routing overhead. These parameters have a direct relationship with broken links and route discoveries, or in other words the staleness of the cache. In order to minimize the need for such a route discovery, the cache has to be constantly checked from time to...
According to special demand of energy control for the routing of wireless sensor networks and balancing the energy of nodes, this paper proposes multipath routing based on ant colony system (MACS). The algorithm utilizes the self-organization, self-adaptability and dynamic optimization capabilities of the ant colony to find the optimal routing and suboptimal routing from Sources to the Sink in order...
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