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The focus of this paper is to analyze and assess the performance of various optimization techniques in the effort to determine the maximum lifetime of the nodes and the throughput in a Wireless Sensor Network (WSN) environment while being able to meet the network's application specific design requirements. We formulated the initial objective of the optimization problem as a nonlinear function and...
Fast transmission of event-driven warning messages and energy conservation are primary concerns to design robust Hybrid Sensors and Vehicular Networks (HSVNs). In last few years, several protocols have been proposed to address these issues. However, the tradeoff between energy consumption and latency has not been carefully studied and sometimes it is given higher priority than event detection efficiency...
Wireless sensor networks (WNSs) are gradually evolving from a promising technology to a well-established reality in a large set of different domains. In order to fulfill the requirements of the specific scenario, a WSN must provide the right tradeoff between performance and lifetime, which is heavily determined by the network design. However, although the complexity of WSNs is increasing, the design...
Cloud computing and Virtualization has become the focus of tremendous amount of research in recent years. The advances in network bandwidth, the need for services that can be accessed anytime from anywhere and the change in ownership models are some of the factors responsible. As cloud services are intended to be ‘always on’, the energy costs to provision services are already significant with increase...
Energy awareness is the single most prominent factor of design in all the layers of the protocol stack for wireless sensor networks. A dynamic back-off procedure in which the size of the contention window is influenced by the real time traffic information of the network can be a good remedy to decrease the idle listening time in low loads and the probability of collisions in high loads. In this paper...
In this paper, an energy-efficient, distance-aware and QoS-guaranteed multi-path routing (EDQMR) protocol for WVSNs is proposed. The routing selecting and updating algorithm is designed under comprehensive consideration of the hop count, delay, the distance between hops and energy information. The path of the largest minimum residual node energy is used as an alternate path to increase the network...
Considering the necessity of reliability providing and lifetime prolonging in wireless sensor networks as Quality of Service requirements, it is necessary to present a new routing algorithm that can best provide these requirements in network layer. Multi-path is favorite alternative for sensor networks, as it provides an easy mechanism to distribute traffic and balance network's load, as well as considerate...
The power-saving class of type II (PSC II), a type of sleep mode operations in the IEEE 802.16e standard, is designed to reduce power consumption for a mobile station with unsolicited grant service and real-time variable-rate connections. However, the configuration of fixed-length listening windows in the PSC II incurs unnecessary energy consumption or packet loss for these types of connections. In...
Energy efficient and stable operation of the DSL broadband access infrastructure has become an essential part of the emerging trend towards green communications. One promising means to obtain energy savings is the use of low power "sleep modes", putting DSL modems to sleep when they are not used. Executing the optimal sleeping policies is, however, not straightforward since turning the modem...
With the tremendous increase in mobile data traffic, system capacity considerations are no longer the primary and only concern to optimize for in cellular networks. The step increase in utilization of cellular networks not only has shorten the recharging cycle of mobile terminals but has further caused a considerable rise in the operators' energy bill. It has therefore become imperative for the sustainable...
In this paper, we propose a minimum transmission energy consumption (MTEC) routing protocol that reduces energy consumption and prolongs network lifetime in user-centric wireless networks. MTEC is proposed for selecting the minimum transmission energy consumption path for data transmission based on the proportion of successful data transmissions, the number of channel events, the remaining node energy...
Carrier Ethernet exhibits an enormous potential to be a cost-effective and less complex replacement of SONET/SDH especially after the ratification of IEEE standard 802.1Qay Provider Backbone Bridge-Traffic Engineering (PBB-TE). The recent IEEE standard 802.3az Energy Efficient Ethernet (EEE) presents another opportunity for service providers to select Ethernet as a technology of choice in the backbone...
Strict delay performance guarantees are required by many applications in wireless sensor networks. Different from traditional approaches, the data aggregation and the stochastic characteristic need to be considered for the delay analysis in sensor networks. In this paper, the problem that how to calculate the stochastic delay bound under different aggregation schemes is solved with the stochastic...
In this paper we study the quality of service (QoS) and energy performance of the carrier sense multiple access with collision avoidance (CSMA/CA) based 802.11p scheme, and our previously proposed modified version of packet reservation multiple access (M- PRMA) scheme for a vehicle-to-roadside (V2R) network in a motorway environment. The simulation results illustrate the deficiency of the 802.11p...
Abstract-For multi-homed streaming service, it is important to enhance the throughput by efficient allocation of resources to the most appropriate interfaces of the User Terminal (UT). However, running multiple interfaces simultaneously can significantly contribute to rapid reduction of battery life. In this work, we propose a Power Minimized Rate Allocation Scheme (PMRAS) with optimal rate allocation...
The thesis also puts forward a fast handoff method based on RSSI and LQI, which makes improvements on preset parameters, subnet selection, decision standards and reparation of switching failure. The new method which confirmed by the simulation not only overcomes the traditional problems in switching technology successfully, but also reduces the scanning and handoff delays, packet loss rate, improves...
In wireless sensor network (WSN), the routing protocol is one of the most important aspects. LEACH (Low Energy Adaptive clustering Hierarchy) is the first routing protocol based on cluster structure. Though there are a lot of improvements on LEACH protocol at present, cluster heads still play the most important role in these routing protocols. Cluster heads are responsible for gathering information,...
Large data centers using high-end processors operating continuously around the clock are major energy consumers. Long periods of idling due to low workload will cause a waste in energy because the processors are active but not doing any useful work. A cluster of low-end embedded processors could continuously match its computational capacity with the workload at a much finer granularity than a server-grade...
Beaconless position-based forwarding protocols have recently evolved as a promising solution for packet forwarding in wireless sensor networks. However, as the network density grows, the overhead incurred grows significantly. As such, end-to-end energy and delay performance is adversely impacted. Motivated by the need for a forwarding mechanism that is more tolerant to growth in node density, an alternative...
We propose a novel synchronizer and design methodology which control the probability of metastability quantitatively by a tunable delay and relax the data rate constraint due to the conventional synchronizer. They improve system performance and reduce energy consumption. We applied our synchronizer and methodology for two types of designs, a digital signal processor and a microprocessor. The former...
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