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Extending ONU lifetime beyond 72 hours in EPON for emergency communications

Extending ONU lifetime beyond 72 hours in EPON for emergency...

引用

2012 International Conference on Computing, networking and Communications, ICNC'12

作者： Zhang, Jingjing Ansari, Nirwan NEC Laboratories America Princeton NJ 08540 United States Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

ISBN: (纸本)9781467300094

The first 72 hours of any disaster relief are critical for saving lives, and are thus referred to as the "golden 72 hours". In order to extend the optical network unit (ONU) lifetime beyond 72 hours in Ethernet passive optical network (EPON) for emergency communications, this paper proposes proper MAC control, traffic scheduling, and admission control schemes to achieve extremely low energy consumptions of ONUs. Simulation results show that the proposed schemes can efficiently reduce the energy consumptions of ONUs by over 90%. Therefore, the lifetime of an ONU whose battery originally has 8-hour backup time is potentially able to be extended beyond 72 hours. © 2012 IEEE.

关键词： Energy efficiency

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Optimizing Cell Size for Energy Saving in Cellular Networks with Hybrid Energy Supplies

Optimizing Cell Size for Energy Saving in Cellular Networks ...

引用

IEEE Global Communications Conference

作者： Tao Han Nirwan Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology

ISBN: (纸本)9781467309202

Green communications has received much attention recently. For cellular networks, the base stations (BSs) account for more than 50 percent of the energy consumption of the networks. Therefore, reducing the power consumption of BSs is crucial to achieve green cellular networks. In this paper, we optimize the energy utilization in cellular networks whose BSs are powered with both regular energy from the grid and the renewable energy. We minimize the on-grid energy consumption of BSs by adapting their cell sizes. The cell size optimization problem is NP-hard. We divide the problem into two subproblems: the multi-stage energy allocation problem and energy consumption minimization problem. We propose an energy allocation policy and an approximation algorithm to solve these subproblems, respectively, and subsequently solve the cell size optimization problem. Simulation results demonstrate that the proposed solution achieves significant energy savings.

关键词： Cellular networks Cell Size energy consumption energy saving Power consumption energy utilisation Approximation algorithms Blind source separation Energy sources energy supply Energy conservation

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E-NOTE: An E-voting System That Ensures Voter Confidentiality and Voting Accuracy

E-NOTE: An E-voting System That Ensures Voter Confidentialit...

引用

IEEE International Conference on Communications

作者： Haijun Pan Edwin Hou Nirwan Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology

ISBN: (纸本)9781457720529

In this paper, we propose an E-voting system based on and improved from our previous work (Name and vOte separaTed E-voting system, NOTE). The proposed E-voting system, referred to as Enhanced NOTE (E-NOTE), is enhanced with a new protocol design and watchdog hardware device to ensure voter confidentiality and voting accuracy. In our improved scheme, other than the Election Committee (EC) and Vote Counting Committee (VCC), an impartial third party, Ballot Distribution Center (BDC), is proposed to take the responsibility of distributing ballots. The votes and the candidates' names are separated into two parts when the voters cast their votes. The watchdog device records all voting transactions to prevent voter frauds. Our proposed procedure addresses issues related to voter confidentiality, voter frauds, and voting accuracy, thus providing a framework for fair elections.

关键词： Watchdog device Vote tally results Cryptography Voter confidentiality Vote Electronic voting Confidentiality Distribute Responsibility Fraud

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HERO: Hierarchical Energy Optimization for Data Center Networks

HERO: Hierarchical Energy Optimization for Data Center Netwo...

引用

IEEE International Conference on Communications

作者： Yan Zhang Nirwan Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology

ISBN: (纸本)9781457720529

With the rapid growth of data center networks in providing a myriad of services and applications to store, access, and process data, the power consumption of data center networks has become critically important and must be efficiently managed. In this paper, we discuss the power optimization of data center networks in a hierarchical perspective. We establish a two-level power optimization model to reduce the power consumption of data center networks by switching off network switches and links while still guaranteeing full connectivity and maximum link utilization. After having shown that the addressed problem falls in the class of capacity constraint multi-commodity flow problems, we design several simple heuristic algorithms to solve the problem. Our simulations show that hierarchical energy optimization can effectively save power consumption in data center networks.

关键词： Power optimization Energy Efficiency Data Center Networks (DCNs) data center Network Power consumption Hierarchical Energy sources

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OPPORTUNISTIC CONTENT PUSHING VIA WIFI HOTSPOTS

OPPORTUNISTIC CONTENT PUSHING VIA WIFI HOTSPOTS

引用

2012 3rd IEEE International Conference on Network Infrastructure and Digital Content

作者： Nirwan Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102USA

Metro WiFi networks can be potentially leveraged to offload data traffic from congested cellular *** this paper,we design a content pushing system which pushes the content to mobile users through opportunistic WiFi *** system responds a user’s pending requests or predicted users’ future requests,codes these requested contents by using Fountain codes,predicts the user’s routes,and prelocates the coded content to the WiFi access points along the user’s *** content prelocation scheme is based on an order-2 Markov predictor and the connection duration *** simulations,we show that a significant amount of content can be delivered to mobile users through the proposed system.

关键词： WiFi Networks Content Delivery Networks Wireless networking.

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OPPORTUNISTIC CONTENT PUSHING VIA WIFI HOTSPOTS

OPPORTUNISTIC CONTENT PUSHING VIA WIFI HOTSPOTS

引用

The 3rd IEEE International Conference on Network Infrastructure and Digital Content (2012年第三届IEEE网络基础设施与数字内容国际会议(IEEE IC-NIDC2012))

作者： Tao Han Nirwan Ansari IEEE Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 USA

Metro WiFi networks can be potentially leveraged to offload data traffic from congested cellular *** this paper,we design a content pushing system which pushes the content to mobile users through opportunistic WiFi *** system responds a user's pending requests or predicted users' future requests,codes these requested contents by using Fountain codes,predicts the user's routes,and prelocates the coded content to the WiFi access points along the user's *** content prelocation scheme is based on an order-2 Markov predictor and the connection duration *** simulations,we show that a significant amount of content can be delivered to mobile users through the proposed system.

关键词： WiFi Networks Content Delivery Networks Wireless networking

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Standards-compliant EPON Sleep Control for Energy Efficiency: Design and Analysis

Standards-compliant EPON Sleep Control for Energy Efficiency...

引用

IEEE International Conference on Communications

作者： Jingjing Zhang Nirwan Ansari NEC Laboratories America Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology

ISBN: (纸本)9781457720529

This paper focuses on reducing energy consumptions of optical network units (ONUs) in Ethernet passive optical network (EPON). In EPON, optical line terminal (OLT) located at the central office broadcasts the downstream traffic to all ONUs, each of which checks all arrival downstream packets so as to obtain the downstream packets destined to itself. Thus, receivers at ONUs have to always stay in the awake status and consume a large amount of energy. To address the downstream challenge, we propose a novel sleep control scheme which can efficiently put ONU receivers into sleep without extending the standardized EPON MAC protocol. We also theoretically analyze the impacts of different parameters in the sleep control scheme on the delay and energy saving performances by using semi-Markov chains. It is shown that, with proper settings of sleep control parameters, the proposed scheme can save as high as 70% of the ONU receiver energy.

关键词： Ethernet passive optical networks EPON energy-efficient design Sleep Optical network units energy capacity Optical Line Terminal Downstream Central office Receivers autocovariance air adjustment scheme energy consumption control parameter

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Ensuring voters and candidates' confidentiality in E-voting systems

Ensuring voters and candidates' confidentiality in E-voting ...

引用

IEEE Sarnoff Symposium

作者： Pan, Haijun Hou, Edwin Ansari, Nirwan Advanced Networking Lab. Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ United States

ISBN: (纸本)9781612846811

A new method based on cryptography to ensure voters and candidates' confidentiality in the Internet E-Voting, referred to as the Name and vOte separaTed E-voting (NOTE) system, is proposed. In NOTE, an impartial party, the Election Commission (EC) will be responsible for part of the vote counting duties besides collecting and verifying the voter ID. The votes and the candidates' names are separated into two parts during the counting process. EC will hold the candidates' names secret before the tally comes up;the Vote Counting Committee (VCC) only counts the votes and is not involved in unveiling the vote tally by virtue of the anonymity of the candidates. Only EC can disclose the final tally after VCC has counted all votes without knowing who the votes are for during the vote counting procedure. This scheme will effectively ensure voters and candidates' confidentiality, and thus improving election security and fairness. © 2011 IEEE.

关键词： Cryptography

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Designing energy-efficient optical line terminal for TDM passive optical networks

Designing energy-efficient optical line terminal for TDM pas...

引用

IEEE Sarnoff Symposium

作者： Zhang, Jingjing Wang, Ting Ansari, Nirwan NEC Laboratories America Princeton NJ 08540 United States Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

ISBN: (纸本)9781612846811

This paper proposes a novel scheme which can efficiently reduce the energy consumption of Optical Line Terminals (OLTs) in Time Division Multiplexing (TDM) Passive Optical Networks (PONs) such as EPON and GPON. Currently, OLTs consume a significant amount of energy in PON, which is one of the major FTTx technologies. To be environmental friendly, it is desirable to reduce energy consumption of OLT as much as possible;such requirement becomes even more urgent as OLT keeps increasing its provisioning data rate, and higher data rate provisioning usually implies larger energy consumption. In this paper, we propose a novel energy-efficient OLT structure which guarantees services of end users with the smallest number of power-on OLT line cards. More specifically, we adapt the number of power-on OLT line cards to the real-time incoming traffic. Also, in order to avoid service disruption resulted by powering off OLT line cards, proper optical switches are equipped in OLT to dynamically configure the communications between OLT line cards and ONUs. © 2011 IEEE.

关键词： Passive optical networks

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On mitigating TCP Incast in Data Center Networks

On mitigating TCP Incast in Data Center Networks

引用

IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Yan Zhang Nirwan Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

TCP Incast, also known as TCP throughput collapse, is a term used to describe a link capacity under-utilization phenomenon in certain many-to-one communication patterns, typically in many datacenter applications. The main root cause of TCP Incast analyzed by prior works is attributed to packet drops at the congestion switch that result in TCP timeout. Congestion control algorithms have been developed to reduce or eliminate packet drops at the congestion switch. In this paper, the performance of Quantized Congestion Notification (QCN) with respect to the TCP incast problem during data access from clustered servers in datacenters are investigated. QCN can effectively control link rates very rapidly in a datacenter environment. However, it performs poorly when TCP Incast is observed. To explain this low link utilization, we examine the rate fluctuation of different flows within one synchronous reading request, and find that the poor performance of TCP throughput with QCN is due to the rate unfairness of different flows. Therefore, an enhanced QCN congestion control algorithm, called fair Quantized Congestion Notification (FQCN), is proposed to improve fairness of multiple flows sharing one bottleneck link. We evaluate the performance of FQCN as compared to that of QCN in terms of fairness and convergence with four simultaneous and eight staggered source flows. As compared to QCN, fairness is improved greatly and the queue length at the bottleneck link converges to the equilibrium queue length very fast. The effects of FQCN to TCP throughput collapse are also investigated. Simulation results show that FQCN significantly enhances TCP throughput performance in a TCP Incast setup.

关键词： Switches Throughput Servers Bandwidth Artificial intelligence Synchronization Convergence

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