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IEEE Conference on Wireless Communications and networking

作者： Ping-Heng Kuo Joonil Choi Junghoon Suh Sungjin Kim Department of Electrical and Computer Engineering University of Canterbury Christchurch New Zealand Communication and Networking Laboratory Samsung Advanced Institute of Technology Suwon South Korea

Zero-forcing beamforming (ZFBF) is a promising technique for multiuser MIMO systems. However, such method requires all the users to feed their channel information back to the base station (BS), so the BS can select the users and receive antennas as well as computing the transmit beamforming matrix. The quality of feedback information is crucial to the resultant system throughput. In order to reduce the power expenditure of the mobile stations (MS) while preserving the feedback quality, we propose a new feedback scheme based on the use of infrastructure relay stations (RS). The simulation results show that the scheme generally gives a better average throughput with lower SNR value requirements.

关键词： Feedback MIMO Broadcasting Relays Array signal processing Throughput Feeds Base stations Receiving antennas Power system relaying

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Non-Linear Predictor-Based Dynamic Bandwidth Allocation over TDM-PONs: Stability Analysis and Controller Design

Non-Linear Predictor-Based Dynamic Bandwidth Allocation over...

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IEEE International Conference on Communications (ICC)

作者： S. Yin Y. Luo N. Ansari T. Wang Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA NEC Laboratories of America Inc. Princeton NJ USA

Non-linear predictor-based dynamic bandwidth allocation (NLPDBA) schemes for improving the time division multiplexed passive optical networks (TDM-PONs) upstream transmission efficiency have been investigated in an ad hoc manner. In this paper, we establish a general state space model to analyze the stability of the NLPDBA schemes from the TDM-PON system's point of view, and propose controller design guidelines to maintain the system stability under different scenarios. We prove that a TDM-PON system with NLPDBA is stable by proper pole placements as the traffic changes. Our analysis suggests a straightforward framework for designing and applying the NLPDBA scheme for TDM-PONs that ensures stability.

关键词： Channel allocation Stability analysis Passive optical networks Optical network units Traffic control State-space methods Nonlinear optics Time division multiplexing Guidelines EPON

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Detecting Pulsing Denial-of-Service Attacks Based on the Bandwidth Usage Condition

Detecting Pulsing Denial-of-Service Attacks Based on the Ban...

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2008 IEEE International Conference on Communications(ICC 2008)

作者： Hiroshi TSUNODA Kenjirou ARAI Yuji Waizumi Nirwan Ansari Yoshiaki NEMOTO Graduate School of Information Sciences TOHOKU UniversitySendaiJapan 980-8579 Advanced Networking Laboratory Department of Electrical and Computer EngineeringNew Jersey Institute of Technology NewarkNJ 07102-1982 USA

Pulsing Denial-of-Service (PDoS) attacks seriously degrade the throughput of TCP flows and consequently pose a grave detrimental effect on network *** fact that they generate less traffic than traditional flood-based attacks makes PDoS detection more *** of the conventional PDoS detection shemes focus on the periodical pattern of the pulse ***,attackers can easily escape the detection system by merely controlling the timing of pulse *** this paper,we propose a novel and robust PDoS detection method which capitalizes on the bandwidth usage condition of network traffic in distinguishing the congestion due to normal traffic from that due to PDoS *** experiments have demonstrated the effectiveness of the proposed scheme in detecting PDoS attacks.

关键词： Detecting Pulsing Denial-of-Service Attacks Based on the Bandwidth Usage Condition Service

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The performance of a watchdog protocol for wireless network security

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International Journal of Wireless and Mobile Computing 2007年第1期2卷 28-36页

作者： Lee, Jin Wook Lee, Yann-Hang Syrotiuk, Violet R. Communication and Networking Lab. Samsung Advanced Institute of Technology P.O. Box 111 Suwon 440-600 Korea Republic of Department of Computer Science and Engineering Arizona State University Tempe AZ 85287-8809 United States

In wireless networks, a watchdog mechanism can be a part of the security architecture used to identify nodes that fail to forward the packets they agree to forward. In this paper, we propose two protocols to address the ambiguous collision limitation of watchdogs. The Watchdog Alert (WA) and Watchdog Confirmation (WC) protocols are variants of the Carrier Sense Multiple Access with Collision Avoidance Protocol (CSMA/CA). We analyse the trade-offs between throughput and watchdog success probability of each protocol, comparing it to CSMA/CA. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Intrusion detection

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GeoPPRA: An energy-efficient geocasting protocol in mobile ad hoc networks

GeoPPRA: An energy-efficient geocasting protocol in mobile a...

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6th International Conference on networking, ICN'07

作者： Jeon, Paul Barom Kesidis, George Networking Technology Lab. Samsung Advanced Institute of Technology Yongin Gyeonggi 446-712 Korea Republic of Department of Computer Science and Engineering Electrical Engineering Pennsylvania State University University Park PA 16802 United States

ISBN: (纸本)0769528058

In this paper, a variant of the conventional multicasting called geocasting, or location-based multicasting, is presented. The proposed scheme combines any casting, restricted broadcasting, and heal broadcasting to deliver packets to a group of nodes presented in a specific geographic region called geocast region. Also, the proposed scheme utilizes a pheromone-aided multipath algorithm (PPRA) to perform energy-efficient load balancing that increases the network lifetime. We compare the performance of GeoPPRA with well-known geocasting protocol GAMER via simulation. The simulation results show significant reductions of energy consumption, while maintaining comparable delivery ratio defined as the ratio of successfully delivered data packets to the total data packets sent from the source to one of the geocast group members. © 2007 IEEE.

关键词： Geographic information systems

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On Modeling VoIP Traffic in Broadband Networks

On Modeling VoIP Traffic in Broadband Networks

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IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Ehsan Haghani Swades De Nirwan Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

With the general trend towards ubiquitous access to networks, more users will prefer to make voice calls through the Internet. Voice over IP (VoIP) as the application which facilitates voice calls through the Internet will increasingly occupy more traffic. The growth of delay sensitive traffic that requires special quality of service from the network will impose new constraints on network designers who should wisely allocate the limited resources to users based on their required quality of service. An efficient resource allocation depends upon gaining accurate information about the traffic profile of user applications. In this paper, we have studied the access level traffic profile of VoIP applications and proposed a realistic distribution model for VoIP traffic. Based on our model, we have introduced an algorithm for resource allocation in networks. It is shown that using our algorithm will enhance the delay and utilization performance of the network.

关键词： Telecommunication traffic Traffic control Broadband communication Resource management Internet telephony Quality of service Web and internet services IP networks Application software Monitoring

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Elliptic Curve Cryptosystem-Based Group Key Management for Secure Group Communications

Elliptic Curve Cryptosystem-Based Group Key Management for S...

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MILCOM, Military Communications Conference

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

Group key management (GKM) prevents all non-membership users from acquiring the group key to decrypt the encrypted messages broadcasted among group members. In this paper, we incorporate elliptic curve cryptosystem (ECC) into GKM to decrease the key length while providing securities at the same level as that of other cryptosystems, and propose the cluster scheme to make the key management more efficient.

关键词： Elliptic curves Elliptic curve cryptography Public key cryptography Broadcasting Security computer network management Technology management engineering management Laboratories computer networks

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A Proactive Test Based Differentiation Technique to Mitigate Low Rate DoS Attacks

A Proactive Test Based Differentiation Technique to Mitigate...

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International Conference on computer Communications and Networks (ICCCN)

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

Low rate DoS attacks are emerging threats to the TCP traffic, and the VoIP traffic in the Internet. They are hard to detect as they intelligently send attack traffic inside the network to evade current router based congestion control mechanisms. We propose a practical attack model in which botnets that can pose a serious threat to the Internet are considered. Under this model, an attacker can scatter bots across the Internet to launch the low rate DoS attack, thus essentially orchestrating the low rate DoS attack that uses random and continuous IP address spoofing, but with valid legitimate IP addresses. It is difficult to detect and mitigate such an attack. We propose a low rate DoS attack detection algorithm, which relies on the core characteristic of the low rate DoS attack in introducing high rate traffic for short periods, and then uses a proactive test based differentiation technique to filter the attack packets. The proactive test was originally proposed to defend DDoS attacks and low rate DoS attacks which tend to ignore the normal operation of network protocols, but it is tailored here to differentiate the legitimate traffic from the low rate DoS attack traffic instigated by botnets. It leverages on the conformity of legitimate flows, which obey the network protocols. It mainly differentiates legitimate connections by checking their responses to the proactive tests which include puzzles for distinguishing botnets from human users. We finally evaluate and demonstrate the performance of the proposed low rate DoS attack detection and mitigation algorithm on the real Internet traces.

关键词： Testing computer crime Internet Communication system traffic control Traffic control Telecommunication traffic Protocols Intelligent networks Scattering Detection algorithms

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GeoPPRA: An Energy-Efficient Geocasting Protocol in Mobile Ad Hoc Networks

GeoPPRA: An Energy-Efficient Geocasting Protocol in Mobile A...

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International Conference on networking (ICN)

作者： Paul Barom Jeon George Kesidis Networking Technology Laboratory Samsung Advanced Institute of Technology Yongin si Gyeonggi South Korea Department of Computer Science & Engineering and Electrical Engineering Pennsylvania State University University Park PA USA

In this paper, a variant of the conventional multicasting called geocasting, or location-based multicasting, is presented. The proposed scheme combines anycasting, restricted broadcasting, and local broadcasting to deliver packets to a group of nodes presented in a specific geographic region called geocast region. Also, the proposed scheme utilizes a pheromone-aided multipath algorithm (PPRA) to perform energy-efficient load balancing that increases the network lifetime. We compare the performance of GeoPPRA with well-known geocasting protocol GAMER via simulation. The simulation results show significant reductions of energy consumption, while maintaining comparable delivery ratio defined as the ratio of successfully delivered data packets to the total data packets sent from the source to one of the geocast group members.

关键词： Energy efficiency Mobile ad hoc networks Broadcasting Multicast protocols Load management Unicast Topology Energy consumption Routing protocols Global Positioning System

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Controllability of Non-Linear Predictor-Based Dynamic Bandwidth Allocation Over EPONs

Controllability of Non-Linear Predictor-Based Dynamic Bandwi...

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IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Si Yin Yuanqiu Luo Nirwan Ansari Ting Wang Advanced Networking Laboratory Department of Elec. and Computer Engineering New Jersey Institute of Technology Newark NJ USA NEC Laboratories of America Inc. Princeton NJ USA

We analyze the dynamic bandwidth allocation (DBA) scheme over Ethernet passive optical networks (EPONs). Our focus is on the non-linear predictor-based DBA (NLPDBA), which outperforms other existing schemes with higher bandwidth utilization and shorter packet delay. We establish a system model to evaluate the controllability of NLPDBA. Analytical results show that NLPDBA maintains the EPON system controllability even when the loaded network traffic changes drastically. Our analysis suggests a straightforward framework to design the DBA scheme that would enable a completely controllable access network.

关键词： Controllability Channel allocation Optical network units Bandwidth Nonlinear dynamical systems EPON Passive optical networks Traffic control High speed optical techniques Nonlinear optics

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