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Nowadays in wireless network the energy consumption and sensor node energy renewable is major challenge. Which make sensor network weak and more critical. The problem of node reachability is considered and Amended Ant colony optimization technique is proposed for optimization. The proposed technique is used for the search of estimated solutions to distinct and endless optimization problems and for...
In this paper, we investigate the delay and delay-constrained throughput performance of a point-to-point wireless-powered communication system, where one node, e.g. a user equipment (UE), is powered by the wireless energy transferred from the other node, e.g. an access point (AP), and uses the harvested wireless energy to send data to the other node. Our focus is on the delay performance of sending...
Low Energy Adaptive Clustering Hierarchy (LEACH) protocol is considered as one of the most important protocols that are frequently used in the Wireless Sensor Network (WSN). Many protocols were developed to modify and improve the LEACH protocol. The multi-hop technique (MHT-LEACH) is one of these protocols, which appeared to improve the performance of the LEACH protocol. In this paper, an improved...
A Wireless Sensor Network (WSN) is a wireless network consisting of small sensor nodes. Sensors are used to monitor physical or environmental conditions. WSNs are particularly used in military and civilian applications. As WSNs are generally deployed in an unattended area, they are prone to various types of attacks. One of the harmful attacks is Sybil attack in which a node illegitimately claims multiple...
Event-driven based traffic consideration in Wireless Sensor network (WSN) is a new area of research in the field of WSN. A few media access control (MAC) protocol has been proposed to handle the variety of both light and heavy traffic load situation such as RC-MAC which allows switching of modes to handle different traffic loads. In RC-MAC, nodes consume extra energy to stay awake like Receiver Initiated...
This paper investigates the problem of maximizing uniform multicast throughput (MUMT) for multi-channel dense wireless sensor networks, where all nodes locate within one-hop transmission range and can communicate with each other on multiple orthogonal channels. This kind of networks show wide application in the real world, and maximizing uniform multicast throughput for these networks is worth deep...
Delay-Tolerant Sensor Networks (DTSN) experience long, unpredictable latency under fluctuating wireless networks with intermittent connectivity. Energy consumption and throughput improvement are essential in the design of MAC for DTSNs. However, when latency is relaxed in DTSN environments, traditional metrics such as throughput and energy consumption cannot express the transmission efficiency and...
In this paper, we focus on the issue of maximizing the data collected by a mobile sink with unlimited energy which traverses a given straight path in an energy harvesting wireless sensor network (EH-WSN). Sensors are assumed to harvest energy periodically from the solar resources in their surrounding. Due to limitations on energy replenished within different time intervals, the sensors can reduce...
In this paper, we propose a new Medium Access Control (MAC) protocol for Wireless Sensor Networks (WSNs) called MMSMAC (Multi-Mode Sensor MAC protocol), which can operate and switch among three modes: synchronous, asynchronous, and hybrid, according to the application requirements. In the synchronous mode, MMSMAC organizes the sensor nodes under even and odd clusters. Each sensor node has its own...
Spectrum sensing is used to detect spectrum holes and find active primary users, while randomly selecting channel for sensing leads to secondary user's lower throughput in high traffic cognitive radio networks. Spectrum prediction forecasts future channel states on the basis of historical information. A new frame structure is proposed in this paper for the imperfect spectrum prediction, improving...
Radio-frequency (RF) based recharging of sensor nodes is a promising way to reduce maintenance and extend the operational life of wireless sensor networks. However RF attenuation causes the network nodes with largest distance from the access point (master node) to dictate the rate of recharging which imposes unnecessary breaks in the operation of nodes closer to the master. This deteriorates the throughput...
Vehicular delay-tolerant networks (VDTN) experience high-speed mobility and volatile topology on a large scale. Therefore, VDTN may not guarantee end-to-end connections. This gives the MAC layer the opportunity to adapt its transmission strategy to the current unstable wireless connections in order to improve transmission efficiency. We propose an adaptive frame length aggregation scheme in VDTN in...
In a Wireless Sensor Network (WSN), Medium Access Control (MAC) protocol is a key component to extend the lifetime of the WSN consisting of sensor nodes. Receiver-Initiated MAC (RI-MAC) is designed to reduce the energy consumed in the idle listening. RI-MAC may not spend energy efficiently since the data frame may collide frequently in the heavy traffic condition. We have proposed the Receiver-initiated...
An underwater communication channel is a challenging medium for wireless data transmissions, so underwater acoustic networks often suffer from high packet loss. Implementing network coding in underwater environment is a promising technique to increase channel throughput and reduce data loss by transmitting packets that contain data from different source nodes. The purpose of the research is to increase...
This paper presents a cross-layer congestion control algorithm based on compressed sensing (CS) in wireless sensor networks (WSNs), in which node-congestion and link-congestion are occurred simultaneously. WSNs model is provided in the first group. The second group includes controller designing: sparse signal is projected compressively in bottleneck node, which reduces the data transmission; then...
This paper proposes an adaptive data aggregation for wireless sensor networks in the TD-SCDMA system. Our design explores a data transmission approach: the atomic MAC layer unit is sent through the TD-SCDMA radio channel by dynamically aggregating one or more sensor packets. A trade-off exists between the desire to reduce header and physical layer overhead by making frames larger, and the need to...
In a wireless delay-tolerant sensor network, the sensors must carry the data and wait for the delivery opportunity to forward the data. The probability of delivery largely depends on the current wireless channel connections. The sensors can optimally use the delivery opportunities to transmit the data while considering the data and nodes attributes. In this paper, we propose a transmission strategy...
Wireless sensor networks operating in 2.4 GHz ISM band are seriously affected by interference from coexisting radio systems such as IEEE 802.11× wireless local area networks. In this paper, we investigate the transmission performance of wireless sensor networks in the presence of co-channel interference. We first analyze the probability of transmission failure and data throughput associated with transmission...
Constant monitoring of patient's health is essential to provide appropriate healthcare. With advances in electronic circuit miniaturization and micro-electromechanical systems (MEMS), wearable sensor nodes can be used to acquire physiological signals from patient's body and transmit them to a remote location which can be accessed by the doctors. Wireless Sensor Networks (WSNs) are becoming an integral...
Dynamic spectrum access in the form of cognitive radio (CR) has gained traction in wireless sensor networks (WSN) because of a) scarcity caused by the proliferation of wireless devices and service and b) it provides spectrum efficient communication for the resource constrained WSNs. However, proper means have to be devised to satisfy the requirements of both WSNs and CRs and to enjoy the benefits...
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