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In order to manage Quality of Service (QoS) and energy efficiency in the optical access network, an online Dynamic Bandwidth Allocation (DBA) algorithm with adaptive sleep cycle is presented. This DBA algorithm has the ability to allocate an additional bandwidth to the end user within a single sleep cycle whose duration changes depending on the current buffers occupancy. The purpose of this DBA algorithm...
The IEEE 802.3az standard, known as Energy Efficient Ethernet (EEE), is one of recent efforts to improve energy efficiency in communications. However, EEE may not achieve good energy efficiency on some traffic patterns. Coalescing techniques were proposed to solve this problem, but their implementations typically employ a simple polity and need further optimization. Adaptive interrupt coalescing (AIC)...
Modern on-chip networks (NoCs) rely on virtual channel (VC) flow control to allow effective utilization of link bandwidth at the cost of more power and longer per-hop latency. Despite many existing optimization techniques for NoCs under VC flow control, we take a further step on questioning its necessity. Our finding is, when the network is not busy, circuit-switching (CS) may already satisfy the...
In recent years, many studies on optimization of energy consumption have focused on heterogeneous processor architectures. Heterogeneous computing model composed of CPU and GPU has developed from co-processing between the chips to CPU and GPU integration on the same die. On the one hand, because GPU can work under low voltage and ultra-low frequency, heterogeneous multi-core processors exhibit better...
Dynamic optical interconnects using fast Optical Circuit Switches (OCS) are emerging as a scalable and energy efficient alternative to increasing network demands. Initial concerns regarding slow switching speeds of OCSs were recently overcome, with prototypes enabling circuit setup in a few microseconds. This can potentially broaden the classes of traffic patterns that can be carried efficiently by...
This paper proposes an advanced sleep-aware dynamic bandwidth allocation (ASDBA) scheme for 10G-EPONs that aims to maximize ONU energy efficiency with sleep mode. In the proposed ASDBA scheme, both upstream (US) and downstream (DS) transmissions are scheduled in the same transmission slot whose duration is minimized based on both DS and US bandwidth requests and the ONU transceiver is switched off...
This paper strives to improve the energy efficiency (EE) of wireless systems by resource allocation for delay sensitive traffic with the statistical quality of service (QoS) requirement, where a delay bound and a small violation probability is ensured. To avoid wasting energy when serving random traffic, we turn the QoS exponent, a key parameter to characterize statistical QoS guarantee under the...
With the proliferation of advanced and interactive services together with the high demand for premium quality of experience, upstream traffic in passive optical networks is growing fast in recent times. Motivated by this, a new power saving mechanism called the sleep-transmit mode (STM) is proposed, which enables the optical network units (ONUs) at customer premises to transmit upstream data during...
IEEE 802.11ah enables new use cases such as smart grid and smart metering for 802.11 with an increased transmission range that reaches up to 1 km at 150 kbps. However, such a large outdoor network creates more hidden nodes due to a much higher path loss between stations than between a station to an access point (AP). 802.11ah has adopted a slotted medium access scheme and an AP assisted medium access...
A channel-sharing method was proposed to improve the bandwidth and energy efficiency per detection task in wireless sensor network. The sensor nodes transmitted their log-likelihood ratios (LLR) to the fusion center in approximately descending order of the absolute value of their LLRs by modifying the value of backoff timer and frame interval according to the values of their LLRs. Simulation results...
A dynamic wavelength and bandwidth allocation algorithm using tunable 10G-SC-VCSEL ONUs is proposed for TWDM-PONs. The algorithm optimizes the number of active wavelengths under a given delay constraint and incorporates sleep and doze operations for improved energy-efficiency.
For the first time, an energy-efficient dynamic bandwidth allocation scheme for long reach PONs is proposed. Results show that the proposed scheme significantly saves ONU energy whilst incurring acceptable frame queuing delays.
Cloud computing is an emerging paradigm that provides computing resources as a service over a network. Communication resources often become a bottleneck in service provisioning for many cloud applications. Therefore, data replication, which brings data (e.g., databases) closer to data consumers (e.g., cloud applications), is seen as a promising solution. It allows minimizing network delays and bandwidth...
Power saving for mobile stations (MSs) is one of the most critical issues in IEEE 802.16j relay networks. To reduce power consumption of MSs, IEEE 802.16j borrows the sleep mode of 802.16e, but new parameters are introduced. Up to now, no previous work has addressed the sleep scheduling problem in IEEE 802.16j networks. Therefore, this paper proposes an energy-efficient, standard-compliant sleep scheduling...
This paper explores the feasibility of Exascale Cloud Computing over the Nobel-EU (European Union) IP backbone network. The EU represents an attractive environment for Exascale Cloud Computing, due to its well-established IP infrastructure with relatively low edge distances. An Exascale Cloud Computing system linking hundreds of data-centers can interconnect potentially millions of servers, considerably...
This paper presents the design and implementation of impulse distributed waveform generator which generates Ultra Wide Band pulses. The generated Ultra Wide Band pulses are in the frequency range of 1GHz to 8GHz. It uses time-interleaved impulse generators to generate the impulses. The trigger signal is supplied to the time-interleaved impulse generators with a specified delay. Frequency variation...
Data gathering applications constitute the main class of applications supported by wireless sensor networks. However, these networks have resources of limited capacity. In this paper, we show how to use the resources more efficiently by reducing the energy required and improving both the throughput and end-to-end delays that can be provided to such applications. The proposed solution is based on graph...
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