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A Software Defined Open Wi-Fi Platform

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China Communications 2017年第7期14卷 137-151页

作者： Kai Kang Zhenghang Zhu Dehua Liu Wuxiong Zhang Hua Qian Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai Research Center for Wireless Communications

Wireless local area network(WLAN) is an indivisible part of the next generation wireless system. In this paper, an open Wi-Fi platform is designed and developed with special consideration of real-time signal processing. Such system can help accelerate research and development of future wireless network, especially in the case of cellular/Wi-Fi co-existing networks. This platform is based on the Intel general-purpose processor and the universal software radio peripheral(USRP) radio front end. The design including the physical layer implementations is purely software and is optimized for real-time signal processing on the general purpose processor. In the lab experiment, this platform supports baseband rate up to 700 Mbps with 2 transmitters in 80 MHz bandwidth. A cellular-Wi-Fi signaling interface between the Wi-Fi access point(AP) and the 5G core network is also developed and validated as an example for wireless resource allocation.

关键词： Wi-Fi IEEE 802.11 5G network convergence software defined radio (SDR)

Present Status and Future Development of Mobile Internet

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China Communications 2009年第1期6卷 113-118页

作者： Wang Jian1, Bi Houjie2 1Nanjing University, Nanjing 210093, China 2Nanjing University of Posts and Telecommunications, Nanjing 210003, China Nanjing University Nanjing 210093 China Nanjing University of Posts and Telecommunications Nanjing 210003 China

With the integration of telecommunications network and Internet, mobile Internet is bound to rise. Mobile Internet brings not only high-quality business experience; but also enormous challenges to telecommunications. The current status and hierarchical structure of the mobile Internet are presented. Technological advances and market demand are promoting development of mobile Internet, and terminals, networks and businesses are three elements of the development of the mobile Internet. Mobile IP technique and related protocols are described systematically, which are designed to allow mobile terminal and the mobile sub-network to roam within the Internet. Then the IP Multimedia Subsystem (IMS) and its architectural framework are expounded, which are designed by (3GPP). The credible and reliable IP network architecture with Quality of Service (QoS) based on IMS is discussed to meet the needs of the next generation of mobile Internet. Finally, the hotspots such as P2P/ Multicast/ Security are pointed out within the mobile Internet.

关键词： Mobile Internet mobile IP IMS network convergence

Enhancement network: confining deep convolutional features based on hand-crafted rules

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The Journal of China Universities of Posts and Telecommunications 2020年第4期27卷 34-42页

作者： Li Yanhua Xiao Wenguang School of Application Engineering Anhui Business and Technology CollegeHefei 231131China No.38 Research Institute of China Electronics Technology Group Corporation Hefei 230088China

Despite convolutional neural network(CNN) is mature in many domains, the understanding of the directions where the parameters of the CNNs are learned towards, falls behind, and researches on the functions that the convolutional networks(ConvNets) learns are difficult to be explored. A method is proposed to guide ConvNets to learn towards the expected direction. First, for the sake of facilitating network converging, a novel feature enhancement framework, namely enhancement network(EN), is devised to learn parameters according to certain rules. Second, two types of hand-crafted rules, namely feature-sharpening(FS) and feature-amplifying(FA) are proposed to enable effective ENs, meanwhile are embedded into the CNN for the end-to-end learning. Specifically, the former is a tool sharpening convolutional features and the latter is the one amplifying convolutional features linearly. Both tools aim at the same spot achieving a stronger inductive bias and more straightforward loss functions. Finally, the experiments are conducted on the mixed National Institute of Standards and Technology(MNIST) and cooperative institute for Alaska research 10(CIFAR10) dataset. Experimental results demonstrate that ENs make a faster convergence by formulating hand-crafted rules.

关键词： convolutional neural network network convergence hand-crafted rules

Satellite Communications Integration with Terrestrial networks

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China Communications 2018年第8期15卷 22-38页

作者： Adam Kapovits Marius-lulian Corici Ilie-Daniel Gheorghe-Pop Anastasius Gavras Frank Burkhardt Thomas Schlichter Stefan Covaci Eurescom GmbH Heidelberg 69123Germany Fraunhofer Institute for Open Communication Systems FOKUS Berlin 10589Germany Fraunhofer Institute for Integrated Circuits IIS Erlangen 91058Germany Technische Universitat Berlin Berlin 10623Germany

In this paper we evaluate the feasibility of seamless and efficient integration of terrestrial communication systems with satellite networks. This aspect is considered by standardisation bodies such as ETSI [1], 5 G-PPP [2] and 3 GPP [3]. A comprehensive system is designed and implemented in an emulation prototype, including standard 3 GPP LTE core network functionality [4] with its different layers: networking, data forwarding, control, management and monitoring and is validated through performance measurements. This work is a technical feasibility study of extending terrestrial communication systems with satellite networks as backhaul, increasing the energy efficiency, network robustness during natural disasters as well as being an alternative for peak-time data forwarding of the terrestrial communication services. Due to its global coverage property, terrestrial-satellite integration provides an obvious extension of communication services towards isolated and remote areas and an alternative for rural or highly distributed/highly mobile enterprise networks.

关键词： network convergence application sector requirements experimental validation

Providing personalized converged services based on flexible network reconfiguration

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Science China(Information Sciences) 2011年第2期54卷 334-347页

作者： HU YuXiang, LAN JuLong & WU JiangXing National Digital Switching System Engineering and Technological Research Center, Zhengzhou 450002, China National Digital Switching System Engineering and Technological Research Center

Recent developments show a progressing convergence of networks, services, and applications, which results in the necessity for new approaches to provide a ubiquitous experience on converged networks for specialized high data-rate services. A fundamental diversifying attribute for the future physical network convergence paradigm is pressing. In this paper, we make researches on converged resource reconfiguration model of substrate physical network based on hardware virtualization and provide a service oriented network architecture as a network convergence primitive. Based on the idea of hardware virtualization which is performed by platform deformation and component processing with reconfiguration (here, they are realized as reconfigurable routers (RR)), the substrate converged network, which inter-connects various access networks by reconfigurable routers, could be mapped into multiplex service oriented logical networks, supports dynamic reconfiguration due to diversified quality of services under heterogeneous environment, and therefore provides more flexible and high- speed multiple services. In addition, to demonstrate the generality of our model, we provide a prototype of reconfigurable router. The design, implementation and task scheduling as well as both hardware and software reconfiguration process of reconfigurable router are discussed in detail. Our evaluation shows that reconfigurable router is transparent for upper service-providing networks and results in little performance impact on the service delivery when both hardware and software reconfiguration are used.

关键词： network convergence hardware virtualization resource reconfiguration reconfigurable router

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