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2009 International Conference on Machine Learning and Cybernetics(2009机器学习与控制论国际会议)

作者： SHAO-YONG GUO XING GAO LAN-LAN RUI LUO-MING MENG National Key Lab.of Networking and Switching Technology Beijing Univ.of Posts and Telecomm.Beijing 100876 China

With the growth of network technologies, abundance of network resources, and increase of various services, mobile devices have gained much functionality and intelligence. At the same time, mobile devices are becoming complicated and many software related problems appear. The traditional remote repair method needs the software providers to supply fault information with corresponding repair strategy. It is inconvenient for users when the sold mobile devices have software faults. However, it is impossible for the manufacturers to supply all the fault information and repair-strategy before selling them. So far, no method has been given to collect repair-strategy from the sold mobile device and optimize the self-repair strategy. In this paper, we propose a self-optimization method to learn the software repair strategy from the sold mobile devices and to optimize self-repair strategy based on the Open Mobile Alliance (OMA) Device Management (DM) standard. The managed objects (MOs) are defined for collecting the strategy data and the self-optimization algorithm is proposed and implemented at the central server.

关键词： Device Management Self-optimization Repair strategy

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Query-based data collection in wireless sensor networks with mobile sinks 09

Query-based data collection in wireless sensor networks with...

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2009 ACM International Wireless Communications and Mobile Computing Conference, IWCMC 2009

作者： Cheng, Long Chen, Yimin Chen, Canfeng Ma, Jian State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Department of Electrical Engineering Stanford University Stanford CA 94305-9505 United States Nokia Research Center Beijing 100176 China

ISBN: (纸本)9781605585697

Considering sensor nodes deployed densely and uniformly in the sensing field, we focus on a scenario that a mobile sink moving through the sensing field queries a specific area or a point of interest for data collection. A Query packet is injected by the mobile sink and routed to the specific area, then the corresponding Response packet is returned to the mobile sink via multi-hop communication. Due to the mobility of the sink, the Query and Response should have different routes. We analyze such a network model to address the problem of efficient data collection in wireless sensor networks and propose an efficient Query-Based Data Collection Scheme (QBDCS). In order to minimize the energy consumption and packet delivery latency, QBDCS chooses the optimal time to send the Query packet and tailors the routing mechanism for partial sensor nodes forwarding packets. Simulation results demonstrate that QBDCS completes a query-based data collection cycle with minimum energy consumption and delivery latency. Copyright 2009 ACM.

关键词： Sensor nodes

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Optimizing the QoS Performance of Fast Rerouting

Optimizing the QoS Performance of Fast Rerouting

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2009 Ninth International Conference on Hybrid Intelligent Systems(第九届混合智能系统国际会议 HIS 2009)

作者： Tao Yu Xin Li Zhen QIN State Key Lab of Switching and Networking Technology Beijing University of Posts and Telecommunicati Institute of China Electronic System Engineering Corp Beijing China

A fast rerouting scheme is proposed to guarantee the QoS performance of rerouted path when handling link and node failures. The new scheme is based on deflection routing mechanism and improves on two aspects: first, it can promptly handle single node failure as well as single link failure, second, QoS metric is taken into accounted when calculating recovery routes. Simulation results show that the proposed scheme could achieve as optimal performance as constrained Bellman-Ford algorithm.

关键词： Deflection routing QoS fast reroute IP resilience

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Cloud Score for Feature Selection

Cloud Score for Feature Selection

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Zhang Guangwei Xu Jianpeng Yang Fangchun Huang Zhen State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Shenzhen Graduate School Harbin Institute of Technology Shenzhen Guangdong China

Feature selection has been studied widely in literatures in supervised learning scenarios. Feature selection methods are categorized into two classes: ¿wrapper¿ and ¿filter¿ approaches. In this paper, we propose a filter method called cloud score based on membership cloud model in fuzzy field. We determine the discrimination power of a certain feature by cloud score to evaluate the feature's importance. This method is compared with variance and Fisher score methods on UCI iris dataset. The results of the experiments demonstrate the feasibility of our algorithm.

关键词： Clouds Filters Helium Position measurement Entropy Fuzzy systems Telecommunication switching Supervised learning Iris Scalability

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Using 'word of mouth' to find community structure in an online IMS system

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Journal of China Universities of Posts and Telecommunications 2008年第SUPPL.期15卷 88-93页

作者： LIN, Rong-heng ZOU, Hua YANG, Fang-chun State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

Presence is a feature that is used widely in lots of system, especially in IMS. The presence system in IMS also provides application developer and end user with a chance to new style applications. But the presence system in IMS has some problems. Previous researches show that the traffic increases rapidly with the presentity number grows. In this study, we would treat the system in a different way by introducing some social networking concepts to the architecture. Moreover, we would focus on how to apply and generate community in the dynamic and online environment. A word of mouth marketing principle would be used to model the community generating procedure. The presence system would works like a marketing environment. Experiment with simple math analysis show this approach is effective for distributed community generating. © 2008 The Journal of China Universities of Posts and Telecommunications.

关键词： Marketing

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An enhanced location service with social feature

An enhanced location service with social feature

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2008 International Conference on Wireless Communications, networking and Mobile Computing, WiCOM 2008

作者： Rongheng, Lin Yao, Zhao Hua, Zou Fangchun, Yang State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781424421084

Location based service can easily locate mobile station's position, which becomes a tool for connecting the virtual world and real environment. But current location service can notify user only bases on the location or time period. In real world, when people use location service, they always need some kind of help more than just know the position. So a traditional location based service can't fit user's demand very well. As it is well known, people are in some kind of relationships, which can help people when they are in difficulty. So in this study, the author will add some social features in the location based service. Some efforts will be taken to do some social functions in pure location service. An enhance location service with Web2.0 feature in it will be proposed. The architecture, key function principle and the privacy issue will also be presented. Moreover, a demo of the idea will be presented in the paper, using an ISG Parlay Simulator to implement a enhance location based service. © 2008 IEEE.

关键词： Location based services

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Web services based interoperation mechanism between network management business process management systems

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Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information technology 2008年第6期30卷 1470-1474页

作者： Zhang, Yue Qiu, Xue-Song Meng, Luo-Ming State Key Lab. of Switching and Networking Technology Beijing University of Posts and Telecommunications Beijing 100876 China

This paper analyzes Wf-XML based interoperation mechanism between workflow management systems and the characteristics of Web Services based description methods for network management services. Making use of the description methods for network management services given by MUWS, the deficiencies of Wf-XML are improved and interoperation interfaces between network management business process management systems are defined. The implementation and application scenarios of the interoperation interfaces are also illustrated. The functionalities of the interoperation interfaces are clearly defined with good extensibilities.

关键词： Web services

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Format-compliant entropy coding encryption algorithms for wireless video system

Format-compliant entropy coding encryption algorithms for wi...

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2008 International Conference on Wireless Communications, networking and Mobile Computing, WiCOM 2008

作者： Li-Feng, Wang Jian, Ma Wen-Dong, Wang Kong-Qiao, Wang Chen, Xiao State Key Lab. of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Department of Electronic and Information Engineering Beijing Electronic Science and Technology Institute Beijing China Nokia Research Center Beijing China School of Computer Science and Technology Bei Hang University Beijing China

ISBN: (纸本)9781424421084

Wireless video security becomes an important challenge for commercial applications. Two efficient encryption algorithms for video system, Signed Integer Exponential-Golomb Coded (SE) Encryption Algorithm and Context-Adaptive Variable Length Coding (CAVLC) Encryption Algorithm are proposed during the process of the entropy coding. In order to maintain the format compliance, the signs of motion vector difference (MVD), delta quantity parameter (QP) in SE are confused, as well as the levels of nonzero transform coefficients in CAVLC are encrypted by stream cipher. Experimental results demonstrate that the proposed algorithms that encrypt much less important data can achieve high security and low complexity, while still maintain compliance to the compression format. The proposed algorithms are especially suitable for wireless multimedia application. © 2008 IEEE.

关键词： Codes (symbols)

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A Route Flap Suppression Mechanism Based on Dynamic Timers in OSPF Network

A Route Flap Suppression Mechanism Based on Dynamic Timers i...

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The 9th International Conference for Young Computer Scientists(第九届国际青年计算机大会)

作者： Fang Wang Xin Li Yuhong Li Shanzhi Chen State key Lab of Networking & Switching Beijing University of Posts and Telecommunications Beijin State key Lab of Wireless Mobile Communication China Academy of Telecommunication Technology Beiji

Route flap caused by link flap in OSPF always leads to network instability and unreliability. Most of the prevailing solutions are network-wide and require all routers to participate in the route flap suppressing process, which not only lack flexibility and scalability but also occupy additional computation resources across the network. In this paper, a localized approach is proposed to suppress the routing flap through dynamically tuning the hello interval of OSPF. To support the real-time adjustment of the hello timer, an analytical model is also established to investigate the relationship between link flap and route flap. Simulation results show that our approach can achieve better performance in eliminating routing flap and at the same time consume much less computation resources than the network-wide method.

关键词： Fast failure detection route flap hello timer network stability

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A Lightweight Video Encryption Algorithm for Wireless Application

A Lightweight Video Encryption Algorithm for Wireless Applic...

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The Fifth IEEE International Symposium on Embedded Computing(SEC 2008)(第五届IEEE国际嵌入式系统计算会议)

作者： WANG Li-feng NIU Jian-wei XIAO Chen MA Jian WANG Wen-dong Beijing Electronic Science and Technology Institute Beijing 100070China State Key Lab of Networking School of Computer Science and Technology Beihang UniversityBeijing 100083China Nokia Research Center Beijing 100013China State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunicati

Protecting the confidentiality and integrity of video information is one of the crucial security elements for many wireless video applications. Taking limited power,processor resource and bandwidth of mobile device into account,a lightweight luminance transform coefficients encryption (LTCE) algorithm,is proposed based on the special feature of the H.264 video coding standard. In LTCE algorithm,the luminance transform coefficients of residual data before entropy coding are adjustably partially encrypted by stream cipher,and it is discussed when ciphertext value are equal to zero in detail. Experimental results demonstrate the proposed algorithm that encrypts much less important data can achieve good security and high efficiency,as well as obtain low complexity and time cost. LTCE algorithm is suitable for security multimedia services for wireless application.

关键词： Cryptography Communication system security Data security Streaming media Protection Information security Bandwidth Video coding Entropy coding Costs

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