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International Conference on Computer and Communications (ICCC)

作者： Lu Ma Zhaoming Lu Bangchao Yu Luhan Wang Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing Beijing CN

In this paper, a joint reducing energy consumption and improving quality of service scheme for the migration of virtual network resources is proposed. This migration algorithm reflects the state of the virtual network resources dynamically, and the algorithm consists of two parts: Energy-efficient Module and QoS Module. Each Module is responsible for a specific function. The Energy-efficient Module is responsible for the energy consumption of servers, and the QoS Module is responsible for the quality of network service, and it can optimize the target nodes with the relative cost of migration. The efficient and QoS-Aware migration algorithm take the energy consumption and the quality of service into account. The simulation results show that the proposed algorithm can reduce energy consumption to the servers, improve the quality of experience, reduce the latency and achieve the objectives of managing of virtual network quickly and easily.

关键词： Servers Algorithm design and analysis Quality of service Energy efficiency Energy consumption Heuristic algorithms Resource management

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Improved recommendation system using friend relationship in SNS 19th

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19th International Conference on Transactions on Computational Collective Intelligence, TCCI 2015

作者： Liao, Qing Wang, Bin Ling, Yanxiang Zhao, Jingling Qiu, Xinyue School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China School of Computer Science Beijing University of Posts and Telecommunications Beijing100876 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing100876 China

ISBN: (纸本)9783662490167

With the rapid development of the Internet, SNS services and 3G commercial mobile applications there have been tremendous opportunities although the development of SNS is very short in China, and the social web game is in the early stage of development. Because of massive users, the potential commercial value of Chinese SNS is still a great mining space. However, a relatively large defects is the precipitation and accumulation on content. The dynamic of friends will affect our own decisions largely, it is favorable for the activity of SNS to increase the number of friends. We have improved the existing models, and conduct experiments to validate it and compare it with previous methods. © Springer-Verlag Berlin Heidelberg 2015.

关键词： Social networking (online)

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An Efficient and QoS-Aware Virtual network Resource Migration Algorithm

An Efficient and QoS-Aware Virtual Network Resource Migratio...

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2015 IEEE International Conference on Computer and Communications(ICCC 2015)

作者： Lu Ma Zhaoming Lu Bangchao Yu Luhan Wang Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

In this paper, a joint reducing energy consumption and improving quality of service scheme for the migration of virtual network resources is proposed. This migration algorithm reflects the state of the virtual network resources dynamically, and the algorithm consists of two parts: Energyefficient Module and Qo S Module. Each Module is responsible for a specific function. The Energy-efficient Module is responsible for the energy consumption of servers, and the Qo S Module is responsible for the quality of network service, and it can optimize the target nodes with the relative cost of migration. The efficient and Qo S-Aware migration algorithm take the energy consumption and the quality of service into account. The simulation results show that the proposed algorithm can reduce energy consumption to the servers, improve the quality of experience, reduce the latency and achieve the objectives of managing of virtual network quickly and easily.

关键词： virtualization energy efficient virtual resourece QoS

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Broadcast Transmission Capacity of VANETs with Secrecy Outage Constraints under Multiple Frequency Bands

Broadcast Transmission Capacity of VANETs with Secrecy Outag...

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IEEE Vehicular Technology Conference

作者： Xinxin He Weisen Shi Tao Luo Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479980895

We study broadcast transmission capacity with secrecy outage constraints in a one-dimension vehicular ad hoc network model. We develop our model on the basis of a highway scenario and extend both ends of the highway to infinity, and vehicles are assumed to follow a homogeneous Poisson point process. We divide the fixed total bandwidth into a large number of sub-bands. In intuition, the increasing number of sub-bands theoretically can support more parallel communications simultaneously. However, the broadcast transmission capacity is not always increased with the increasing number of sun-bands. Hence, we study the relationship between broadcast transmission capacity and the number of sub-bands, and then deduce the optimum number of sub-bands. After that, we also derive the equation of the broadcast transmission capacity over Nakagami fading channels and the transmission capacity with the secrecy outage constraint, respectively. Finally, numerical results verify that there is an optimal number of sub-bands in different scenarios.

关键词： VANETs Transmission Capacity Secrecy Outage Multiplefrequency bands

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Nonlinear Joint Transceiver Design for Coordinated Multi-cell systems with Energy Cooperation

Nonlinear Joint Transceiver Design for Coordinated Multi-cel...

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IEEE International Conference on Communications

作者： Zhirui Hu Chunyan Feng Tiankui Zhang Qin Niu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781467364300

This paper studies the nonlinear transceiver design in downlink coordinated multi-cell system where base stations (BSs) are powered by hybrid sources, including conventional grid and renewable energy. Renewable energy is collected by energy harvesting equipment deployed at BS. However, the harvested energy from different BSs varies in space and time, and the system gain will be limited by the least energy of the coordinated BSs. One of the methods to settle this drawback is energy cooperation among BSs. The nonlinear joint transceiver is formulated as an optimization problem to maximize the minimum signal-to-interference noise ratio of streams under the transmit power constraint. The closed-form solutions are derived by the proposed two-step algorithm. The proposed algorithm guarantees the performance balancing among all users and all streams of each user. Simulation results illustrate the performance improvement of the proposed algorithm.

关键词： Coordinated multi-cell Nonlinear precoding Trancseiver design Energy harvesting Energy cooperation

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Coverage Characterization in Wireless Powered Communication networks with Energy Harvesting

Coverage Characterization in Wireless Powered Communication ...

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IEEE Conference on Vehicular Technology (VTC)

作者： Yuanyuan Yao Changchuan Yin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479980925

The performance of wireless powered communication networks (WPCNs) with transmitters (TEs) self-sustained by opportunistically harvesting radio-frequency (RF) energy from nearby power beacons (PBs) is investigated. A ``harvest-then-transmit'' protocol is considered, under which a TE first harvest the wireless energy from its nearest PB and then send information to its associated receiver (RE) with the energy stored in the battery. A variable power transmission mode is proposed that the TE is allowed to transmit as long as its harvested energy is larger than a predefined transmission threshold. The transmission probability of the TEs is derived. The coverage probability with the TEs non-fully charged and fully charged, respectively, are characterized. By using numerical analysis, we study the tradeoff between energy harvesting and data transmission for different system parameters, such as energy harvest-ratio, transmission threshold, and PB density. Simulation results are provided to validate our theoretical analysis.

关键词： Energy harvesting Wireless communication Wireless sensor networks Radio frequency Batteries Protocols Data communication

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LT-based multi-source transmission strategy for information-centric networking

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Journal of Information and Computational Science 2015年第3期12卷 927-934页

作者： Guo, Song Wu, Muqing Hu, Qian Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

Information-centric networking (ICN) is a promising network architecture that has attracted much attention in the area of future network. ICN supports multi-source communications innately because of the content-based routing mechanism. In this paper, we explore an LT-based (Luby Transform) multi-source transmission strategy applied to Named Data networking which is a widely-researched ICN paradigm. Each content stored in different provider is encoded into a stream of symbols by LT codes to be delivered to a consumer. A decoding algorithm different from belief propagation is presented and simulation results show that our algorithm is better at the aspect of decoding success rate. Furthermore, some necessary modification on forwarding process is conducted to make the process better compatible with our strategy. simulation results demonstrate that our LT based multi-source transmission strategy has a significant effect when the number of providers is increasing. ©, 2015, Binary Information Press. All right reserved.

关键词： Belief propagation

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Distributed Power Control for Two-Tier Femtocell networks with QoS Provisioning Based on Q-Learning

Distributed Power Control for Two-Tier Femtocell Networks wi...

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IEEE Conference on Vehicular Technology (VTC)

作者： Zhengfu Li Zhaoming Lu Xiangming Wen Wenpeng Jing Zhicai Zhang Fengchao Fu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

The explosive growth of mobile multimedia services has caused tremendous network traffic in wireless networks and a great part of the multimedia services are delay-sensitive. Therefore, it is important to design efficient radio resource allocation algorithms to increase network capacity and guarantee the delay QoS. In this paper, we study the power control problem in the downlink of two-tier femtocell networks with the consideration of the delay QoS provisioning. Specifically, we introduce the effective capacity (EC) as the network performance measure instead of the Shannon capacity to provide the statistical delay QoS provisioning. Then, the optimization problem is modeled as a non- cooperative game and the existence of Nash Equilibriums (NE) is investigated. However, in order to enhance the self-organization capacity of femtocells, based on non-cooperative game, we employ a Q-learning framework in which all of the femtocell base stations (FBSs) are considered as agents to achieve power allocation. Then a distributed Q-learning-based power control algorithm is proposed to make femtocell users (FUs) gain maximum EC. Numerical results show that the proposed algorithm can not only maintain the delay requirements of the delay-sensitive services, but also has a good convergence performance.

关键词： Delays Interference Quality of service Power control Femtocell networks Macrocell networks Resource management

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Wideband spectrum sensing based on coprime sampling

Wideband spectrum sensing based on coprime sampling

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International Conference on Telecommunications (ICT)

作者： Shiyu Ren Zhimin Zeng Caili Guo Xuekang Sun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

In wideband compressive spectrum sensing, when the number of occupied subbands in the monitored wideband increases, the existing compressive sensing approaches have to raise the sampling rate to maintain a desired sensing performance. What is worse, that will add computational complexity of the following signal reconstruction. To overcome this issue, this paper proposes a novel wideband spectrum sensing approach based on time-domain coprime sampling. Our approach first estimates the power spectrum of the wideband signal by employing the coprime sampling scheme, then performs detection via a subband-bin energy detector. The cornerstone of our approach is that we can generate a Nyquist space sampled autocorrelation from the sub-Nyquist samples by implementing the coprime sampling scheme. Demonstrated by the simulations, our proposed wideband sensing approach has a better performance under high compression ratio and a better robustness against noise compared with the orthogonal matching pursuit (OMP). Also it is illustrated that our approach has the advantage over computational complexity by analyzing. Considering the merits synthetically, the novel wideband sensing approach adapts better to a higher bandwidth by comparision.

关键词： Sensors Correlation Wideband Computational complexity Noise Estimation Time-domain analysis

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A bi-direction congestion control mechanism for CCN

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Journal of Computational Information systems 2015年第18期11卷 6853-6859页

作者： Guo, Song Wu, Muqing Hu, Qian Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

Content-centric networking (CCN) is a new promising network architecture which is a popular representative among many Information-centric networking (ICN). Since CCN has some transmission characteristics differing from those of TCP/IP network, traditional transport protocol may not be well suitable for CCN. It is necessary to propose a new congestion control mechanism for CCN. In this paper, we present a novel method to control the congestion that adapts two window of different grain at the consumer side and provider side. Then we introduce a dynamic factor on the consumer side that represents the capability of an interest packets to help improve the network efficiency. Simulation results demonstrate that the mechanism proposed in this paper is a practicable approach that can effectively deal with network congestion while keeping high efficiency. © 2015 by Binary Information Press.

关键词： network architecture

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