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How to measure and maintain connectivity is an important issue in ad hoc networks. A special case of such network is Wireless Sensor Networks (WSN), which are often deployed in harsh environments and also susceptible to a number of problems that may negatively affect the connectivity among the nodes. An additional factor that increases the cost of connectivity maintenance in ad hoc networks is when...
This paper presents a multi-hop dynamic moving algorithm to repair the coverage holes, while maintaining the initial topology and connectivity, for the wireless sensor networks. In such environment, the movement of each sensor node is fully distributed and autonomous. The proposed algorithm takes the density measures into consideration for determining which node to move and to what direction and distance...
In recent years, improving network model and enhancing the network performance have received people's attention gradually. The peer-to-peer network model has been used in Ad Hoc networks to increase the data output rate, to reduce the transmission power, to increase network capacity and the better load balance. However, the network analysis topology computation, the routing and the energy supply have...
Energy costs for data centers are a significant part of the overall expenses for their operation. With a reduction of these and associated costs, huge savings can be achieved. This paper describes a way to reduce the energy costs for data centers. The general idea behind our solution is very simple. Instead of routing the information required for any service interaction to and from the data center...
Recently, the availability of numerous low-cost robotic units (e.g., Packbot, Robomote, and Khepera) has made it possible to massively deploy mobile sensors in a network and use them in a disposable manner. It has been shown that the controlled mobility offered by sensors can be exploited to improve the energy efficiency of a network. In this paper, we study a new problem called max-data mobile relay...
In this paper we present a full performance analysis of an energy conserving routing protocol in mobile ad hoc network, named EM-AODV (Energy Multi-path Ad-hoc On-demand Distance Vector routing). EM-AODV is a reactive routing protocol which combines two mechanisms used in the basic AODV protocol. AODV and most of the on demand ad hoc routing protocols use single route reply along reverse path. Rapid...
Energy consumption and network connectivity are two of the important research issues that are yet to be resolved in mobile ad hoc networks (MANETs). As taken advantage of in static networks, reliable topology control algorithms are also considered to be a good approach for mobile networks. However, a more adequate evaluation of these algorithms regarding mobility is still needed. In this paper, we...
Underwater sensor networks were recently proposed to support quite a few aquatic applications such as ocean exploration and harbor monitoring. Different from terrestrial WSNs, the underwater sensor networks have many unique characteristics, such as greater propagation delay, higher dynamic topology and sparse node density. These features bring many new challenges to the protocol design of underwater...
WiMAX is a technology based on IEEE 802.16 standard that enables the delivery of last mile wireless broadband access as an alternative to wired access such as cable or DSL. WiMAX can provide mobile wireless broadband connectivity without the requirement for direct line-of-sight with a base station. With the development of wireless network, WiMAX has the characteristics of long transmission distance,...
This paper proposes an Energy Efficient Clustering Scheme for mobile ad hoc networks. In the initial clustering stage, a node's residual energy, nearby topology, relative location and relative mobility are used for determining whether the node is suitable for being a cluster head. In the cluster maintaining stage, a strategy called Distance Estimation Broadcasting is designed to help a cluster member...
A mobile sink is widely considered to facilitate the data collection from energy constrained sensor fields, by having the sink come close to the sensors and conserving precious sensor node energy. The effectiveness of such a data collection approach can be measured in terms of the sensor energy conserved and the time required to collect the sensor data from the field (or, equivalently, the length...
In this paper, we propose an energy-balanced cross-layer multi-path routing algorithm for wireless Ad hoc networks. This algorithm utilizes cross-layer information of the network nodes and can balance the energy consumption of the network nodes in flow distribution under the situation that the network topology is maintained unchanged; moreover, the transmission power can be adjusted in routing process...
An energy efficient multi hop sensor network cannot avoid the energy hole problem, which is the rapid decrease in the energy of nodes around the sink. Also as a sensor network has a limited node resources and unexpected changes of external environment, its nodes should show energy efficiency, reliable data transmission, and topological adaptation to the change of external environment. This study proposes...
MANETs is mobile networks with no infrastructure. The main characteristic of MANETs is mobility, which causes dynamic changing of topology and link failure. Route repair mechanism, which is initiated after link failure occurred, broadcasts route request messages to the network to find a new route. Finally, there are only a few nodes selected to be the member of the new active route. That means most...
An inherent concern for a wireless sensor network (WSN) is the unbalanced energy consumption problem, where sensors closer to the sink are more likely to exhaust their energy faster than other nodes. To mitigate this problem, this paper considers including some resource-rich mobile nodes, called mobile data-pumps, to conduct data relaying from static sensors to the sink. The network thus becomes a...
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 propose energy efficient mobility adaptive distributed clustering algorithm for mobile ad hoc network. Node mobility in the dynamic network has a remarkable affect on cluster stability. In order to reduce the initial cluster setup time of the dynamic network with frequently changing topology, we consider a single node parameter as the cluster head selection criteria. That is the...
In wireless sensor networks, much research has focused on improving energy consumption and network lifetime due to limited power available on sensor nodes. The imbalance of node energy consumption results in the network partition blocking data transmission from sources to sinks. This paper proposes an efficient node deployment control protocol to achieve balanced energy consumption among sensor nodes...
This paper presents two novel mechanisms for the OLSR routing protocol, aiming to improve its energy performance in Mobile ah-hoc Networks. Routing protocols over MANET are an important issue and many proposals have been addressed to efficiently manage topology information, to offer network scalability and to prolong network lifetime. However, few papers consider a proactive protocol (like OLSR) to...
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...
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