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Data center energy consumption has become one of the top concerns in designing and operating large-scale data centers as cloud service providers such as Amazon, Google, IBM and Microsoft have begun to establish more data centers in response to growing requests in clouds. In recent years, extensive efforts have been put into the research of reducing the energy consumption of servers. With the improvement...
Non-volatile memory express (NVMe) based SSDs and the NUMA platform are widely adopted in servers to achieve faster storage speed and more powerful processing capability. As of now, very little research has been conducted to investigate the performance and energy efficiency of the state-of-the-art NUMA architecture integrated with NVMe SSDs, an emerging technology used to host parallel I/O threads...
Densely-deployed heterogeneous networks (HetNets) with large number of small cell base stations (SBSs) will constitute one of the main pillars of emerging 5G wireless systems. While such dense deployments of HetNets can help in achieving capacity requirements of 5G networks, they can also result in a significant increase in energy consumption. Since there may not be many associated users in certain...
In wireless sensor networks (WSNs) energy balancing and energy efficiency are the key requirements to prolong the network lifetime. In this paper, we investigate the problem of energy hole, where sensor nodes located near the sink or in some other parts of the network die very early due to unbalanced load distribution. Moreover, there is a dire need to utilize the energy resource efficiently. For...
Several applications in machine learning and machine-to-human interactions tolerate small deviations in their computations. Digital systems can exploit this fault-tolerance to increase their energy-efficiency, which is crucial in embedded applications. Hence, this paper introduces a new means of Approximate Computing: Dynamic-Voltage-Accuracy-Frequency-Scaling (DVAFS), a circuit-level technique enabling...
In wireless sensor networks (WSNs) energy balancing and energy efficiency are the key requirements to prolong the network lifetime. In this paper, we investigate the problem of energy hole, where sensor nodes located near the sink or in some other parts of the network die very early due to unbalanced load distribution. Moreover, there is a dire need to utilize the energy resource efficiently. For...
Design of energy efficient underwater wireless sensor networks (UWSNs) routing protocol to prolong network lifetime is a challenging task because of limited battery life of sensor nodes. In this paper, we propose mobile energy efficient square routing protocol (MEES) to balance energy consumption of nodes in the network. Two mobile sinks are deployed at the farthest distance from each other. In order...
Network life time is a critical aspect of application in wireless sensor networks (WSN). Furthermore energy consumption and security has arisen as a major aspect in network design. In this article, a study of the backoff exponent (BE) management in the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) method under the Medium Access Control (MAC) is conducted. While BE parameter define...
In this paper, a routing protocol, Maximum Coverage in Square field region (MCS) for Underwater Wireless Sensor Networks (UWSNs) is introduced. The overall area of the network is divided into ten sub regions and two mobile sinks (MSs) are deployed. The data is transmitted to the MS directly and mobility pattern of MS is adjusted in such a way that it covers the whole area of the network. When MS and...
This paper studies the potential improvements in terms of energy efficiency and system throughput of a hybrid automatic retransmission request (HARQ) mechanism. The analysis includes both the physical (PHY) and medium access (MAC) layers. We investigate the trade-off provided by HARQ, which demands reduced transmit power for a given target outage probability at the cost of more accesses to the channel...
In 2013, U. S. data centers accounted for 2.2% of the country's total electricity consumption, a figure that is projected to increase rapidly over the next decade. Many important workloads are interactive, and they demand strict levels of quality-of-service (QoS) to meet user expectations, making it challenging to reduce power consumption due to increasing performance demands. This paper introduces...
A novel ordinary differential equation (ODE) solver is proposed by using a stochastic integrator to implement the accumulative function of the Euler method. We show that a stochastic integrator is an unbiased estimator for a Euler numerical solution. Unlike in conventional stochastic circuits, in which long stochastic bit streams are required to produce a result with a high accuracy, the proposed...
In this paper, we propose an energy efficient multipath congestion control protocol, called emReno. emRemo can shift traffic to the lower energy cost path without sacrificing the throughput and still guaranteeing the fairness and load balancing. The extensively simulations show the features of emReno as a common multipath congestion control protocol as well as its energy efficient characteristic.
In wireless ad hoc network the wireless sensor networks form a great part in the recent period. There are many challenging issues that have been faced in the wireless sensor networks. Data collection by improving the throughput performance forms a great issue. To increase the throughput performance over a dense area network with large number of sensor nodes energy consumption with pre-specified path...
Energy consumption becomes a very important performance indicator of manufacturing system. By turning non-bottleneck machines into sleep mode, energy saving system operation in real time will be indispensable strategy for modern information rich manufacturing system under Industry 4.0 environment. From the system perspective, a general energy saving operation strategy is proposed to utilize the transient...
The proposed work aims at designing routing method and data compression algorithm for WSN's. An ad-hoc network (WANET) is considered and based on certain criteria the data is forwarded dynamically. Various parameters such as Compression Ratio, Packet Delivery Rate, Energy consumption are considered to determine the efficiency of the network. One of the primary parameters to be considered in the configuration...
In this study, we address the problem of minimizing the energy consumption in future 5G networks by means of a joint optimization of radio access network (RAN) and multi-hop wireless backhaul network. The objective of the optimization is to operate the network with the smallest set of base stations while meeting the quality of service (QoS) requirements of users. We first pose the optimization problem...
The emerging 5G wireless networks will pose extreme requirements such as high throughput and low latency. Caching as a promising technology can effectively decrease latency and provide customized services based on group users behaviour (GUB). In this paper, we carry out the energy efficiency analysis in the cache-enabled hyper cellular networks (HCNs), where the macro cells and small cells (SCs) are...
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...
In virtualized datacenters (vDCs), dynamic consolidation of virtual machines (VMs) is used to achieve both energy-efficiency and load balancing among different physical machines (PMs). Using VM live migrations, we can consolidate VMs on a smaller number of hosts to power down unused PMs and save energy. Most migration schemes are however oblivious to the characteristics of services that run inside...
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