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2013 5th International Conference on Intelligent Human-Machine systems and Cybernetics, IHMSC 2013

作者： Wang, Ying Liu, Feng Lei, Zhenming Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9780769550114

A good quality of experience (QoE) is a critical factor to the success of mobile Internet business for Internet Service Providers (ISPs) and Internet Content Providers (ICPs). Based on the analysis of social applications' communication mechanism on smart phone, we proposed a group of QoE indicators to evaluate the QoE of social business from the user's experience perception perspective. Then, we analyzed the influencing factors further and brought forward the calculation method of these indicators. And on this basis, we discussed how to differentiate social applications' traffic and identify the user's specific behaviors from those traffic. After that, we adopted passive measurement technique to measure this group of indicators on iPhone platform in the actual network environments. The experiments' results show that, this group of indicators can reflect the user's real experience accurately when they use social business. © 2013 IEEE.

关键词： Smartphones

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Fragmentation-based dynamic multicast routing and spectrum assignment algorithm in spectrum-sliced elastic optical path networks

Fragmentation-based dynamic multicast routing and spectrum a...

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Asia Communications and Photonics Conference, ACP 2013

作者： Liu, Xiaoxu Gu, Rentao Ji, Yuefeng Bai, Lin Huang, Zhitong Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781557529893

We define the fragmentation based on the blocking probability and propose a fragmentation-based dynamic multicast routing and spectrum assignment (FBDM-RSA) algorithm in spectrum-sliced elastic optical path (SLICE) networks. Simulation results indicated that the proposed FBDM-RSA algorithm outperforms some existing ones in both multicast network coding and spectrum fragmentation. © OSA 2013.

关键词： network coding

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Component analysis of GPRS traffic based on LLC frames from a live network

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9th International Symposium on Linear Drives for Industry Applications, LDIA 2013

作者： Wang, Huan Lei, Zhen Ming Gui, Xiao Lin Wu, Xiao Long Beijing Key Laboratory of Network System Architecture Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9783037858639

GPRS is the dominant mobile Internet access in China. However, the nature of GPRS traffic characteristics remains unexamined for many reasons. In this paper, we present observations at both LLC-level and cell-level from passive monitoring of more than 2700 GPRS/EGPRS cell sites connected to the same SGSN at Gb interface. The traffic traces are from a major China ISP in one urban area of Northern Province during an ongoing 24 h period in August 2012. We found that user traffic averages at about 95% of overall traffic in both directions. Furthermore, we defined a cell-time record to measure the dynamic utility of radio resource and found that most cell sites have low traffic at most time, with the growth of total traffic load, the proportion of signal traffic declined correspondingly. All the conclusions in the paper are meaningful for researchers, network operators, and other members of the GPRS community. © (2013) Trans Tech Publications, Switzerland.

关键词： Cells

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Structural analysis of complex networks from the Mobile Internet

Structural analysis of complex networks from the Mobile Inte...

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National Doctoral Academic Forum on Information and Communications Technology 2013

作者： Qiao, Yuan-Yuan Yang, Jie Lei, Zhen-Ming Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunication Beijing 100876 China

ISBN: (纸本)9781849198196

Mobile Internet is one of the most popular networks in the world. Constructing the physical structure of mobile Internet is the key to modeling the network. The existing studies of fixed Internet are not suitable for mobile Internet and a deep understanding of traffic graph in mobile Internet is required. In this paper, we construct a user-server network graphs from the complete flow records of mobile Internet collected from our self-developed equipment deployed in southern China. We investigate the characteristics of the properties of Web, IM and overall traffic as the complex network point of view. Different types of traffic have different characteristics. In addition, node degree and node strength distribution of servers show that mobile network follow the power law, however, node degree and node strength distribution of users do not possess the power law property. We further study the distributions of average strength for each edge of node which follow the power law, and find the regular pattern of exponents for different applications. These discoveries could be used by the ISPs and researchers to optimize the deployment of network resources and enhance the security of the network and the Quality of Services(QoS).

关键词： Complex networks

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Resource allocation scheme based on weighted power control in cognitive radio systems

Resource allocation scheme based on weighted power control i...

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2013 International Conference on Communications, Circuits and systems, ICCCAS 2013

作者： Li, Jingye Luo, Tao Yue, Guangxin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Integrated Services Networks Xidian University Xi'an China

ISBN: (纸本)9781479930517

Opportunistic spectrum access (OSA) is a promising method to improve the spectrum utilization. In this paper, we propose a weighted power control approach to further exploit the flexibility of OSA. We first give the definition and basic idea of confidence level of sub-channel idle (CLSI), then two schemes are raised to enhance the system performance considering the time-variance of channels, the accuracy of spectrum sensing and mutual interference (MI) in power-constrained cognitive radio systems. The first scheme is to maximize the system capacity, and the second one is a multi-objective optimization model for maximizing both the system capacity and the user satisfaction. Both theoretical analysis and simulation results demonstrate that scheme 1 can achieve optimal system capacity, and scheme 2 can obtain sub-optimal system capacity with optimal user satisfaction compared to the conventional algorithm. © 2013 IEEE.

关键词： Optimal systems

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A novel blocking probability balance scheme to improve network performance for SLICE network

A novel blocking probability balance scheme to improve netwo...

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Asia Communications and Photonics Conference, ACP 2013

作者： Wang, Jinyu Guo, Junhu Cao, Bei Li, Hui Ji, Yuefeng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications No.10 Xi Tu Cheng Road 100876 Beijing China

We proposed a novel blocking probability (BP) balance scheme called BPB to improve SLICE network performance under dynamic traffic, by not only considering network's average BP value but also balancing each node&#... 详细信息

ISBN: (纸本)9781557529893

关键词： Blocking probability

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Large-Scale Traffic Characterization of Chinese Multimedia Messaging Service Using Hadoop

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China Communications 2013年第9期10卷 143-154页

作者：董超彭栋黄博伦雷振明杨洁 Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Texas A&M University

Recently, there have been many mo- bile value-added services in the Chinese mo- bile telecommunication market nowadays. Am- ong them, the characteristics of Multimedia Mes- saging Service （MMS） have not yet been fully understood. In this paper, with the help of a cloud computing platform, we investigated the flow-level charactefistcs of Chinese MMS. All of the experimental data were collected by the TMS equipment deployed in a major node in Sou- them China. The collection time spanned six mo- nths. We performed high-level analysis to show the basic distributions of MMS characteristics. Then, by analysing the detailed MMS features, we determined the distribution of personal MMS, and made a comprehensive comparison between 2G and 3G MMS. Finally, we tried to build a model on the personal MMS inter-arrival time, and we found that the Weibull distribution was optimum.

关键词： traffic monitoring MMS cloud co-mputing mobile telecommunication network

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Neighbour Peer Selection Scheme Based on Effective Capacity for Mobile Peer-to-Peer Streaming

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China Communications 2013年第5期10卷 89-98页

作者：夏海轮王宁曾志民 Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications

For Peer-to-Peer (P2P) streaming services in mobile networks, the selection of appropriate neighbour peers from candidate peers with demanding data is an important approach to improve Quality-of-Service (QoS). This paper proposes a novel Effective Capacity Peer Selection (ECPS) scheme based on effective capacity. In the ECPS scheme, the neighbour peer selection problem was modeled using the Multiple Attribute Decision Making (MADM) theory, which considered multiple factors of candidate peers, including Signal to Interference and Noise Ratio (SINR), residency time, power level, security, moving speed, and effective capacity. This model could increase the suitability of ECPS for wireless mobile environments. Then, the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) was used to solve the MADM problem and identify the preferred neighbour peers. Simulation results show that the ECPS scheme can improve the network throughput, reduce packet delay by about 82%, and almost double the packet delivery ratio of the mobile P2P streaming service.

关键词： P2P mobile P2P streaming peer selection effective capacity MADM QoS

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Lotka-Volterra model based virtual network resource allocation for improving revenue-cost ratio

Lotka-Volterra model based virtual network resource allocati...

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IET International Conference on Information and Communications Technologies, IETICT 2013

作者： Hu, Lijuan Shou, Guochu Hu, Yihong Guo, Zhigang Beijing Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781849196536

network virtualization has been pushed forward as an important potential solution to the gradual ossification problem faced by the existing Internet, allowing multiple heterogeneous network architectures to cohabit on a shared physical network. Efficient allocating the sacred physical resources among multiple virtual networks requests is a major challenge. Current resource allocation studies mainly focus on developing mapping algorithm with the model of one physical network and one virtual network. In this paper, we introduce a Lotka-Volterra model based resource allocation algorithm, consisting of multiple virtual networks. We apply the Lotka- Volterra model, which is a mathematical population model of bio-inspired species competition approach, to implement distributing resources for virtual networks. And Simulation results show that the proposed algorithm enhances the performance of the revenue-cost ratio and revenue of the embedding problem.

关键词： Costs

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Improved RETE algorithm in context reasoning for web of things environments

Improved RETE algorithm in context reasoning for web of thin...

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2013 IEEE International Conference on Green Computing and Communications and IEEE Internet of Things and IEEE Cyber, Physical and Social Computing, GreenCom-iThings-CPSCom 2013

作者： Gao, Teng Qiu, Xiaofeng He, Lijuan Mobile Life and New Media Laboratory Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9780769550466

RETE is the most efficient forward inference algorithm for the development of context-aware rule-based systems. The performance of context reasoning engines in context-aware systems depends mainly on the efficiency of the pattern matching in "Cognition-Execution Loop". Nowadays many real-world contexts from WoT (Web of Things) environments have data characteristics such as large amount, quick change and lots of constant operation, imposing a trade-off between the cost of time and space of RETE algorithm. Thus, in this paper RETE+ - an improved RETE network is proposed, capable of handling context from WoT environment, which actually includes different types of data for reasoning with new characteristics. RETE+ algorithm applies shortcut memory using LRU (Least-Recently-Used) algorithm to the matching process of alpha network and solves the problems of intensive computation with all the alpha nodes. This approach takes advantage of the LRU algorithm to select alpha nodes with the highest possibility to be executed, which considerably reduces the computation overhead. The proposed approach is applied to context reasoning engine and evaluated through contrast experiments using real-world WoT data. The case study and experimental analysis demonstrate the capability of the proposed algorithm. © 2013 IEEE.

关键词： Internet of things

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