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The wireless sensors deployed at the highway can ensure the safety of the traveling vehicles. However, the ribbon deployed wireless sensor network in the roadside infrastructure can easily to generate energy hole. Cooperative communication between sensors and vehicles is an effective way to improve this situation and reduce the energy consumption of the sensors. A cooperative relay selection algorithm...
In a conventional wireless transmission system, studies are usually focus on increasing transmission rate instead of energy efficiency (EE). In this paper, we propose a hybrid transmission strategy to investigate the EE in a wireless transmission system. In this hybrid transmission strategy, the transmission mode is switched between the direct transmission (DT) mode and the amplify-and-forward relay...
Advancement of medical science brings together new trend of proactive health care which gives rise to the era of Wireless Body Area Networks (WBAN). A number of issues including energy efficiency, reliability, optimal use of network bandwidth need to be considered for designing any multi-hop communication protocol for WBANs. Energy consumption depends on many factors like amount and frequency of forwarding...
Energy harvesting (EH) enabled relaying has attracted lots of interests recently, as the network energy consumption can be reduced and the coverage range can be extended simultaneously. In most existing literatures, the Harvest-Store-Use (HSU) model is utilized to describe the energy flow behavior of the EH system. However, the half-duplex (HD) constraint of HSU that harvested energy can only be used...
Energy harvesting (EH) enabled relaying has attracted considerable attentions as an effective way to prolong the operation time of energy-constrained networks and extend coverage beside desired survivability and rate of transmission. In most existing literatures, the Harvest-Store-Use (HSU) model is utilized to describe the energy flow behavior of the EH system. However, the half-duplex (HD) constraint...
As the rapid growth of the data traffic, the mobile cellular network is under unprecedented operation pressure. Various of small cells with relay technologies have been proposed to bypass increased data with the status of the limited base station so far. Therefore, vehicular small cell gradually are attracting the attention of the researchers. In this paper, we discuss the communication model of the...
In this paper, we aim to minimize in-body sensor node energy consumption and to prolong the network lifetime by utilizing a relay strategy based on our proposed flexible quality of service (QoS) radio frequency communication module and advanced In-to-out body path loss (PL) model. A selection algorithm is derived and investigated in which the relay nodes with lower energy consumption and minimum distance...
Battery-operated mobile devices may lose their freedom of mobility because of their dependence on being in close proximity to a power outlet as applications with higher computation and processing capabilities consume more energy and drain battery life faster. One of the techniques used to minimize energy consumption in battery-operated mobile devices is user cooperation at the time of wireless transmission...
In Wireless Sensor Network cluster making techniques is proved as energy efficient as compare to normal WSN mechanism. WSN contain small sensor nodes power by battery and do the work of sensing and processing of that senses signal. These tiny sensor node consume lots of energy in sensing and then transmission of signal. By the used of clustering method where each individual node not to direct communicate...
In two-phase cooperative multicast communications, the unbalanced outage probabilities of the cell-center and cell-edge users are the main reason that caps the energy-efficiency of the system. In this paper, we consider the unbalanced outage probability and propose a probability-based relay selection and power control method to improve the energy-efficiency, in which each user can autonomously decide...
In this paper, we investigate the throughput maximizing problem for a classic three-node relay communication system with a receive-and-forward relay node, which is able to harvest energy from the nature using a rechargeable battery. Besides of the energy consumption for reforwarding the received data, the energy for receiving data at the relay node is also considered. The objective is to maximize...
This work is devoted to the error rate and energy-efficiency analysis of regenerative cooperative networks in the presence of multipath fading and spatial correlation. To this end, exact analytic expressions are firstly derived for the symbol-error-rate of M-ary quadrature amplitude modulation in a dual-hop decode-and-forward relay system under spatially correlated Nakagami-m fading channels and maximum...
This work addresses problems related to interference mitigation in a single wireless body area network (WBAN). In this paper, We propose a distributed Combined carrier sense multiple access with collision avoidance (CSMA/CA) with Flexible time division multiple access (TDMA) scheme for Interference Mitigation in relay-assisted intra-WBAN, namely, CFTIM. In CFTIM scheme, non interfering sources (transmitters)...
Monitoring systems using Wireless Body Area Networks (WBANs) are becoming more and more popular and widely used to respond to the increasing demand in real time healthcare applications. When operating in group, the WBANed people could form an ad-hoc network remotely monitored via Internet, help each other to relay their data and thus prolong their lifetime. In fact, if a BAN coordinator reaches critical...
In the present scenario WBAN is an evolving and developing area which is mostly used in medical applications to keep an eye on patients. This paper explains an energy harvesting adaptive protocol used for node connectivity which results in minimum power consumption, increased network lifetime, and high throughput. Peer to peer topology is used, where all nodes have both uplink and downlink. That means...
In Wireless Sensor Network (WSN), due to limited battery energy, reduction of energy consumption is a challenging issue. In a typical clustered WSN, decisions can be taken locally at (cluster level) as well as globally at a central Sink. Local decision making requires information exchange among neighbor clusters. In this work, a network coding based opportunistic relaying strategy has been proposed...
There is an emergent concern in green wireless communication, to decrease the energy consumption in cellular uplink networks. In this paper, network cooperation (NC) is investigated as a method of energy saving. Now-a-days, user terminals, i.e., smart phones are usually furnished with various network access interfaces like cellular networks (CN), Bluetooth and Wi-Fi. This paper examines the cooperative...
A Wireless Sensor Network (WSN) is a set of self-powered sensor nodes. These nodes are deployed in infrastructure less mode to collect the useful information from the environment and transmit it to the sink node. The significance of Wireless Sensor Networks has been evidenced in many applications like military areas, health monitoring and observation of earthquake etc. However, WSN has also some limitations...
Wireless sensor network is a diverse network. One of the important limitation of the wireless sensor network is limited life-time, wireless nodes typically operates with small batteries for which replacement, when possible, is very difficult and expensive. Therefore nodes must operate without battery replacement for long time. Consequently, minimizing the energy consumption is a very important design...
In recent decades, due to limitation of radio spectrum and increasing users in wireless networks, spectral efficiency has been a considerable issue in literatures. In addition, energy consumption is rapidly increasing in wireless communications due to growing demand for wireless technologies especially cellular networks. Therefore, energy efficiency has become an important issue in such networks....
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