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International Conference on Wireless Communications and Signal Processing

作者： Hao Wu Hailun Xia Chunyan Feng Sainan Li Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781467358309

The problem of interference mitigation in two-tier downlink orthogonal frequency division multiple access (OFDMA) femtocell networks is considered in this paper. We propose a potential game based distributed power control algorithm, aiming at maximizing the users' SINRs and improving the system capacity. With a penalty factor in system capacity as a utility function for macrocell and femtocell, a global optimization problem then turns into a local optimization problem with multi-iterations. Based on gradient projection response criterion, dynamically rational power allocation for each resource block is performed, achieving the coordination of interference between macrocell and femtocell and increasing system capacity. Simulation results show that the proposed scheme effectively reduces the system capacity loss and improves the throughput of macrocell users with minor performance degradation of the femtocell users. Moreover, the proposed scheme is easy to implement in a decentralized manner.

关键词： interference mitigation OFDMA femtocell potential game gradient projection power control

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A NEIGHBOR PEER SELECTION ALGORITHM BASED ON LOAD BALANCE IN MOBILE P2P STREAMING

A NEIGHBOR PEER SELECTION ALGORITHM BASED ON LOAD BALANCE IN...

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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： Hailun Xia Nana He Wu Hao Zhimin Zeng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

In mobile peer to peer streaming system,to solve the influence brought by the load difference among cells,a neighbor peer selection algorithm based on load balance is *** the strategy,the comprehensive evaluation value of the candidate peer is achieved through the use of gray relation analysis theory on multi-attribute decision matrix including load balance degree,and then the neighbor peer list is got through ranking the comprehensive evaluation *** results show that with the peer selection scheme in mobile p2p streaming system,the system's bandwidth utilization and the user's average throughput are improved.

关键词： Peer selection Mobile p2p streaming Multi-attribute decision Gray relation analysis

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Reversed and Bidirectional Irrigation Methods for Equal-Scale Virtual network Embedding Problem

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China Communications 2012年第11期9卷 127-136页

作者： Huang Tao Liu Jiang Chen Jianya Liu Yunjie Key Laboratory of Universal Wireless Communications of Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 P. R. China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 P. R. China

Previous Virtual network (VN) embedding researches mostly focus on developing heuristic algorithms to enhance the efficiency of a physical resource. However, in the equal-scale condition, where the scale of a VN is similar to that of a substrate network, the number of successfully mapped VNs decreases sharply since bottlenecks form easily in the substrate network and disturb the embedding process. In this paper, reversed and bidirectional irrigation methods are proposed for the equal-scale and all-scale conditions. The two proposed methods can be combined with most of the existing heuristic algorithms and map a relatively large number of VNs by reducing the potential substrate bottlenecks. The simulation results show that the reversed irrigation method almost doubles the successfully mapped Revenue than the traditional one in the equal-scale condition. Meanwhile, the bidirectional irrigation method achieves the synthetically best performance in almost all scale conditions.

关键词： VN embedding equal-scale reversed irrigation bidirectional irrigation

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RESEARCH ON CHARACTERIZING CHINESE MULTIMEDIA MESSAGING SERVICE (MMS)

RESEARCH ON CHARACTERIZING CHINESE MULTIMEDIA MESSAGING SERV...

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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： Chao Dong Bolun Huang Zheng Ma Zhenming Lei Jie Yang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beiiing 100876 China

Multimedia Messaging Service (MMS) is a standard way to send multimedia messages (MMs),is one of the most popular mobile data services in *** paper analyzed Chinese MMS based on a one-week MMS flow log collected from a commercial ISP covering an entire province in Southern *** the distribution of MMS transmission quantity each day,as well as the transmission speed and inter-arrival time ***,with the curve fitting approach,Weibull model was found to be the most appropriate for the distribution of inter-arrival time,which is able to apply to any further mobile network analyses related to the MMS inter-arrival time.

关键词： Mobile telecommunication network Multimedia messaging service MMs speed distribution Inter-arrival time

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Bandwidth-cost based QoS extension to OSPF

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International Journal of Advancements in Computing Technology 2012年第18期4卷 244-251页

作者： Li, Li Li, Yanjing Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications China International School Beijing University of Posts and Telecommunications China

The emerging of various applications in Internet leads to a technical challenge of quality of service (QoS) guarantee, which is much more critical in the coexisting multi-services scenarios especially. Traditional Open Shortest Path First (OSPF) protocol without QoS consideration has to be improved in order to be utilized efficiently in today's network. In this paper, an on-demand QoS routing mechanism is proposed, which has the main advantage of reaching the QoS demands of the upper layer services while keeping the minimum modification to the existing OSPF protocol. The core of this mechanism is a novel path selection algorithm, which aims to find the best route with minimum cost under the limits of bandwidth requirements. The function and performances of this BW-cost based QoS algorithm are simulated as well as compared to those of the standard Dijkstra algorithm, which is originally used in OSPF, and an existing on-demand QoS algorithm extended to OSPF. Simulation results validate the outstanding performance of the proposed algorithm on load balancing, network utilization and delay: it has the similar ability of load balancing to the existing on-demand QoS algorithm, a little better performance of network utility as well as a great better performance of delay than it, never mention that it exceeds the standard Dijkstra algorithm significantly on each performance parameters listed above.

关键词： Bandwidth

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An Overlapped Clustering Scheme of Coordinated Multi-Point Transmission for LTE-A systems

An Overlapped Clustering Scheme of Coordinated Multi-Point T...

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2012 IEEE 14th International Conference on Communication Technology

作者： Jingjing Zhao Tiankui Zhang Zhimin Zeng Qiubin Gao Shaohui Sun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications State Key Laboratory of Wireless Mobile Communications (CATT)

ISBN: (纸本)9781467321006

In this paper,we propose an overlapped clustering scheme to decide the cooperation cells for coordinated multi- point (CoMP) *** the scenario of joint processing of CoMP,the cooperated cells jointly transmit for users so the inter- cell interference among the cooperation cells are ***,the cluster-edge users suffer from the inter-cluster *** overlapping patterns are defined for the cluster-edge users to make sure that these users become the overlapping cluster-center *** the overlapping patterns and clusters are allocated orthogonal frequency resource,which can cancel inter-cluster interference and improve the performance of cell-edge *** results show that the proposed overlapped clustering scheme yields significant improvement to cell-edge users’ spectrum efficiency as well as increasing average cell throughput.

关键词： CoMP overlapped clustering pattern

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P2P Traffic Classification Based on Flow Features of Transport and Application Layer

P2P Traffic Classification Based on Flow Features of Transpo...

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2012年互联网技术与应用国际学术会议

作者： Gang He Shanshan Zhen Xiaochun Wu Dechen Yu Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications

The Internet has been undergoing development and changes continuously,with lots of new techniques and applications coming *** used P2P applications and Web 2.0 websites have gradually changed the Internet traffic in terms of traffic volume and flow duration,making the traditional classification methods *** analyzed TCP and UDP flows separately,thus proposed a P2P traffic classification method based on the flow features of transport layer and application layer,in order to evade the differences caused by the transport layer protocol,and find properties that help to describe the features of application *** applied a BP neural network in traffic monitoring program,and made timely classification of P2P flows in real network.

关键词： P2P traffic classification statistical characteristics machine learning neural network

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THE IDENTIFICATION FOR P2P THUNDER TRAFFIC BASED ON DEEP FLOW IDENTIFICATION

THE IDENTIFICATION FOR P2P THUNDER TRAFFIC BASED ON DEEP FLO...

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2012 IEEE 2nd International Conference on Cloud Computing and Intelligence systems

作者： Jie Liu Fang Liu Dazhong He Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication EngineeringBeijing University of Posts and Telecommunications

network traffic analysis and identification play important roles in network traffic monitoring. The network applications are the root causes to generate network traffic and network behavior. network traffic analysis and identification is the basis of other network problems, which provides ISP an effective basis to control and distinguish the network traffic. With the popularity of Internet, "download" has become one of the most important parts of the domestic Internet users. As more and more resources, there is more and more enthusiastic discussion of the download tools. This paper takes one of the most popular download applications Thunder （also called Xunlei） for example, indicating the significance of the flow-based statistical network traffic classification and identification. Through the characteristics extraction, we can identify the Thunder traffic with high accuracy, and at the same time, the time cost in the experiment is reduced a lot.

关键词： Characteristics extraction Deep flow inspection DFI Thunder Traffic identification

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An empirical investigation into CDMA network traffic classification based on feature selection

An empirical investigation into CDMA network traffic classif...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Jie Yang Zheng Ma Chao Dong Gang Cheng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Microsoft Corporation Redmond USA

With the rapid development of CDMA systems, mobile network based applications have been undergone a tremendous growth in the past several years. The ability to accurately classify network traffic is of critical importance to the network design, troubleshooting, performance evaluation, and optimization. In this paper, we explore the design of an accurate and scalable machine learning (ML) based traffic classification system upon correlation-based feature selection (CFS) methods. With extensive data collected from a Tier 1 production cellular network, we experimentally show that our proposal achieves a high classification accuracy and low computational complexity.

关键词： Accuracy IP networks Multiaccess communication Telecommunication traffic Machine learning Classification algorithms

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A Polarization-Amplitude-Phase Modulation scheme for the Power Amplifier energy efficiency enhancement

A Polarization-Amplitude-Phase Modulation scheme for the Pow...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Dong Wei Chunyan Feng Caili Guo Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

To improve the Power Amplifier (PA) energy efficiency, a Polarization-Amplitude-Phase Modulation (PAPM) scheme in wireless communication, which introduces the signal's Polarization State (PS), amplitude and phase as the information-bearing parameter, is proposed. Since that the transmitted signal's PS can be completely determined by a pair of orthogonal dual-polarized antennas and is unaffected by the PA, using the PS as the information-carrying parameter can further increase the data rate and allow PA to work in its non-linear region. Thus, the PA energy efficiency can be enhanced. On the basis of the above, to optimize the PA energy efficiency, an optimization problem regarding the output back off value and the ratio between the data carried by the PS and the amplitude-phase has been formulated, and the distribution of the optimum solutions is presented. The simulation results show that, with the same symbol error rate and channel state, PAPM can reduce the energy consumption per bit by 50% compared with QAM on average.

关键词： Quadrature amplitude modulation Nonlinear distortion Phase modulation Optimization Wireless communication

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