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Admission control plays an important role in providing Quality of Service (QoS) guarantees for wireless mesh networks (WMNs). Multipath routing can improve network performance in reliability and load balancing. However, when the multipath routing are adopted in 802.11-based WMNs, the transmission with bandwidth assurance is facing rigorous challenges. In this paper, a novel joint design of multipath...
Disruption Tolerant Networks (DTNs) are characterized by frequent network partitioning. This causes network connectivity to be opportunistic. In recent years, many collaborative applications have been envisioned for DTNs. These applications rely on the availability of reliable group communication protocols. To address this challenge in DTNs, we propose a scalable multicasting scheme that deterministically...
Lifetime-maximization is the critical concern for wireless sensor networks (WSNs). We notice that two common issues in existing routing schemes for WSNs are that (1) a path may traverse through a fixed set of sensors, draining out their energy quickly, and (2) packet retransmissions over an unreliable link of any fixed-path may consume energy significantly. In this paper, we exploit two natural advantages...
Sensor networks are wireless networks with peculiar properties that require specific attention to be properly managed if their performance and dependability have to be taken care of. In fact, both the usually hard environmental conditions where sensors are deployed and the scarcity of node resources determine overall critical working conditions that dramatically impact on parameters such as reliability,...
Sensor networks are composed of many sensors usually far from the region is available. Routing in wireless sensor networks for the transfer of information from sensor nodes to base station is especially important. Optimum consumption of energy is important requirements in wireless sensor networks because sensor systems typically use battery power. In this paper with a routing algorithm to determine...
Trade-off between energy-efficiency and reliability in wireless sensor networks is application dependent. Without the reliability, the extended lifetime of a network is of limited use. Due to the inherent correlation between reliability and congestion, it is necessary to reduce congestion to improve reliability. Existing congestion control algorithms in wireless sensor networks are reactive. They...
Due to resource limitations in wireless sensor networks, prolonging the network lifetime has been of a great interest. An efficient routing technique is known as hierarchical routing based on clustering, in which finding the optimum cluster heads and number of them has been a challenge. In this paper, a two-level fuzzy logic is utilized to evaluate the qualification of sensors to become a cluster...
In wireless sensor networks (WSNs), gathering sensed information, transforming the information data to the base station in an energy efficient manner, and lengthening the network lifetime are important issues. Clustering is an energy efficient way that divides sensor nodes into many clusters, each of which has a cluster-head. The routing from cluster-head sensor nodes to the base station, however,...
The wireless sensor network is an autonomous collection of sensors which makes a simple, high speed and inexpensive network. These kinds of network are able to monitor a parameter where the coverage is impossible via wired networks. Since, the sensors in wireless networks are equipped with batteries, these networks are energy constrained and clustering approaches play an important role in energy efficiency...
This paper introduces a method for lifetime/real-time optimization of wireless ad hoc networks. The method utilizes a network simulator to model the network signature for actual deployments and routing paths. Since the transmit power is fixed, many nodes may not save energy from communication. At the same time, all nodes save energy from calculations and the number of hops may be controlled. The network...
A wireless sensor network consists of many low-power, low-cost nodes which can perform sensing, computing, and send short messages over short distance. In respect that sensor nodes are powered by batteries, energy would be very important for wireless sensor work. In this paper, we proposed an efficient relay node displacement mechanism which considers each node's energy consumption and analysis the...
In this paper, we propose a novel dynamic routing strategy called tunnel routing that enables efficient and resilient data forwarding from sensors to a destination in wireless sensor networks. Instead of establishing a single static path, tunnel routing identifies a set of trusted sensor nodes that form a tunnel between the source and the destination. Terminals in the tunnel cooperate with each other...
In wireless sensor networks, it is an important task to periodically collect data from an area of interest for time-sensitive applications. The sensed data must be gathered and transmitted to a base station for further processing to meet the end-user queries. Since the network consists of low-cost nodes with limited battery power, it is a challenging task to design an efficient routing scheme that...
In the distributed Cognitive Radio Networks, routing should consider how to dynamically select frequency band for either per flow throughput guarantee or global spectrum utilization. Since different second users may sense different spectrum availability, efficiently sharing this information in the dynamic spectrum environment still remains challenging, however, collaborative route and spectrum selection...
Self-protection in WSN (wireless sensor networks) has not been deeply studied because WSN has a high rate of failure. The major concern in WSN is to maximize the networkpsilas lifetime. In this work we propose and evaluate a WSN architecture consisting of nodes grouped in cell arrays. Sensors located in arrays of directional antennas may apply strategies of self-configuration and some mechanisms to...
Many anticipated deployment scenarios, in particular military, healthcare, and disaster-recovery applications, of Wireless Sensor Networks (WSNs) require reliable source to sink communication. Since transmission range of sensors is quite limited, to achieve higher end-to-end transmission reliability, WSNs generally employ intermediate backbone links (wired or wireless) that can deliver packets at...
We consider multi-resolution storage, a technique for providing scalable adaptive data fidelity, necessary for many applications of large wireless sensor networks (WSNs). Although the previously proposed design of multi-resolution storage, based on quad trees and geographic routing, is conceptually simple, it exhibits inherent problems if applied to real-world WSNs. To address these problems, we revisit...
This paper presents a robust, dynamic cross-layer wireless communication architecture for wireless networked control systems. Each layer in the proposed protocol architecture contributes to the overall goal of reliable, energy efficient communication. The protocol stack also features a broadcast-based link-layer that determines and recovers from route failures more rapidly than current wireless technology...
Facing the security threats and the energy shortage, a multi-angle trust mechanism for nodes in wireless sensor networks was proposed, which extended the previous trust model only base on communication trust. With adding the sensing data and the node's energy in the factors of trust assessment, and new trust models to calculate the trust values of the sensed data and the node's energy, a more reliable...
Wireless sensor networks (WSNs) are known to be highly energy-constrained and each networkpsilas lifetime has a strong dependence on the nodespsila battery capacity. As such, the network lifetime has been a critical concern in WSN research. While numerous energy-efficient protocols have been proposed to prolong the network lifetime, various definitions of network lifetime have also been used for the...
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