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IEEE International Symposium on Electromagnetic Compatibility (EMC-beijing)

作者： Feng Zhou Zhen Ma Hai-Man Zhang Feng Gao Xiu-Hua Yuan Xiang-Yang Zhang China Academy of Information and Communication Technology Beijing China Network Optimization Center China Mobile Communications Group Shan-xi Co. Ltd. Xi-an China School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing Beijing CN Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing Beijing CN

Diffraction loss exists in the corner of L-corridor in buildings. Both measurement and simulation show that conventional diffraction propagation model does not fit L-corridor. The diffraction loss increases linearly w... 详细信息

关键词： Diffraction Loss measurement Propagation losses Frequency measurement Transmitting antennas Mathematical model Receiving antennas

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A modified Matérn hard core point process for modeling and analysis of dense IEEE 802.11 networks 13

A modified Matérn hard core point process for modeling and ...

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13th International Symposium on Wireless Communication systems, ISWCS 2016

作者： Tao, Lei Wen, Xiangming Lu, Zhaoming Jing, Wenpeng Chen, Kun Zhao, Xiaoguang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Beijing Laboratory of Advanced Information Networks Beijing China Beijing Advanced Innovation Center for Future Internet Technology China

ISBN: (纸本)9781509020614

Stochastic geometry is a powerful tool for modeling wireless networks employing various MAC protocols with random topologies. For wireless networks operating carrier sense multiple access/collision avoidance (CSMA/CA) protocol, there are distance constraints between simultaneous transmitters, and only one node is allowed to transmit within its carrier sensing range. Matérn hard core point process is generally used to model and analyze the performance of this type of networks, because it is a repulsive point process that also defines a minimum distance between any two points. However, the traditional Matérn HCPP has the defect of underestimating the intensity of concurrent transmission nodes, which will affect the accuracy of analysis results, when wireless nodes are densely deployed. In this paper, we propose a modified Matérn HCPP called TM-HCPP which can mitigate the intensity underestimation problem to model dense IEEE 802.11 networks. Then, we simulate the network coverage probability using the traditional Matérn HCPP and the proposed TM-HCPP, and compare the simulated results with the theoretical analyzed results. Simulation results validate the accuracy of the proposed TM-HCPP. © 2016 IEEE.

关键词： Wireless networks

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Handoff management scheme based on frame loss rate and RSSI prediction for IEEE 802.11 networks 13

Handoff management scheme based on frame loss rate and RSSI ...

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13th International Symposium on Wireless Communication systems, ISWCS 2016

作者： Tao, Lei Wen, Xiangming Lu, Zhaoming Wenpeng, Jing Biao, Zhang Gang, Cao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Beijing Laboratory of Advanced Information Networks Beijing China Beijing Advanced Innovation Center for Future Internet Technology China

ISBN: (纸本)9781509020614

This paper proposes a frame loss rate (FLR) and received signal strength indicator (RSSI) prediction based handoff management scheme to reduce the ping-pong effect caused by the purely RSSI based handoff decision schemes in IEEE 802.11 networks. The proposed scheme is performed by each mobile station (MS) in a decentralized manner. In the proposed scheme, the FLR information is used as handoff trigger criterion. To perceive the change trends of wireless link thus reducing the target AP selection time, the proposed scheme adopts polynomial regression-based RSSI prediction approach. The predicted RSSI together with FLR information is used for target access point (AP) selection. Moreover, we construct neighboring AP information list (NAIL) for MSs to store the above information. Therefore, the proposed scheme can also be called NAIL-based handoff management scheme. The results indicate that the proposed scheme can effectively reduce the invalid handoffs and avoid the ping-pong effect. © 2016 IEEE.

关键词： Forecasting

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A Terahertz RF Selective Switch Based on Graphene

A Terahertz RF Selective Switch Based on Graphene

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IEEE International Conference on Internet of Things

作者： Xiaoyuan Ma Weijun Hong Li Deng Shufang Li Liang Yin Beijing Key Laboratory of Network System Architecture and Convergence

ISBN: (纸本)9781509058815

According to the variable conductivity of the graphene and the principle of surface acoustic wave, a new type of 30THz three billing graphene frequency selective switch is proposed in this paper. The selection switch has 3 selection paths. By controlling the conductivity of graphene, we can change the refractive index of the intermediate graphene lens, then change the direction of the plane wave and choose signal pathway flexibly. There is a good isolation between the output ports, the minimum value can reach -30dB. And the attenuation of signal input and output is about -10dB. On the whole, the selection switch has the characteristics of scalable, tunable, and high isolation,has a greater inspiration for graphene device design in the future.

关键词： terahertz graphene conductivity frequency selective switch

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Echo state transfer learning for data correlation aware resource allocation in wireless virtual reality

arXiv

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arXiv 2017年

作者： Chen, Mingzhe Saad, Walid Yin, Changchuan Debbah, Mérouane Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China Wireless-VT Bradley Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA United States Mathematical and Algorithmic Sciences Lab Huawei France R & D Paris France

In this paper, the problem of data correlation-aware resource management is studied for a network of wireless virtual reality (VR) users communicating over cloud-based small cell networks (SCNs). In the studied model, small base stations (SBSs) with limited computational resources act as VR control centers that collect the tracking information from VR users over the cellular uplink and send them to the VR users over the downlink. In such a setting, VR users may send or request correlated or similar data (panoramic images and tracking data). This potential spatial data correlation can be factored into the resource allocation problem to reduce the traffic load in both uplink and downlink. This VR resource allocation problem is formulated as a noncooperative game that allows jointly optimizing the computational and spectrum resources, while being cognizant of the data correlation. To solve this game, a transfer learning algorithm based on the machine learning framework of echo state networks (ESNs) is proposed. Unlike conventional reinforcement learning algorithms that must be executed each time the environment changes, the proposed algorithm can intelligently transfer information on the learned utility, across time, to rapidly adapt to environmental dynamics due to factors such as changes in the users' content or data correlation. Simulation results show that the proposed algorithm achieves up to 16.7% and 18.2% gains in terms of delay compared to the Q-learning with data correlation and Q-learning without data correlation. The results also show that the proposed algorithm has a faster convergence time than Q-learning and can guarantee low delays. Copyright © 2017, The Authors. All rights reserved.

关键词： Virtual reality

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Research and Comparative Analysis of Performance Test on SDN Controller

Research and Comparative Analysis of Performance Test on SDN...

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2016 First IEEE International Conference on Computer Communication and the Internet

作者： Fan Yamei Liao Qing He Qi School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence China Telecom Corporation Limited Beijing Research Institute

ISBN: (纸本)9781467385169

The emergence of Software Defined network(SDN)gives the demand of big data and network management a *** separates the control and forwarding in traditional network through OpenF low *** the software-defined network,SDN controller is an important integral part that is the core of *** this paper,firstly we summarize the common SDN controller,and choose two popular,wider using open-source controllers(OpenD aylight and ONOS),analyze the implementation architecture and model framework of the two *** build the controller platform,simulate the underlying topology using IXIA test instruments,Cbench and Mininet to get the performance parameters and furthermore analyze the data.

关键词： SDN Test OpenDaylight ONOS

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Research and comparative analysis of performance test on SDN controller 1

Research and comparative analysis of performance test on SDN...

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1st IEEE International Conference on Computer Communication and the Internet, ICCCI 2016

作者： Fan, Yamei Qing, Liao Qi, He School of Information and Communication Engineering Beijing University of Posts and Telecommunications 100876 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing100876 China China Telecom Corporation Limited Beijing Research Institute Beijing102209 China

ISBN: (纸本)9781467385145

The emergence of Software Defined network(SDN) gives the demand of big data and network management a chance. SDN separates the control and forwarding in traditional network through OpenFlow protocol. In the software-defined network, SDN controller is an important integral part that is the core of SDN. In this paper, firstly we summarize the common SDN controller, and choose two popular, wider using open-source controllers(OpenDaylight and ONOS), analyze the implementation architecture and model framework of the two controllers. Then build the controller platform, simulate the underlying topology using IXIA test instruments, Cbench and Mininet to get the performance parameters and furthermore analyze the data. © 2016 IEEE.

关键词： Controllers

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Link Maintenance Scheme for OFDM-Based Cognitive Radio Ad Hoc networks

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China Communications 2015年第10期12卷 42-51页

作者： LI Jingye LUO Tao LIU Xuelian YUE Guangxin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Transmission among the cognitive users(CUs)' is always interrupted by the primary users(PUs)' reclaim of the spectrum and the fading effect of wireless *** maintain reliable continuous communication among CUs,an efficient scheme for link maintenance in OFDM-based cognitive radio Ad Hoc networks is proposed in this *** the scheme,redundant sub-channels(RSC) are employed by CUs to tackle the outage problem caused by the PUs' reclaim of the spectrum and wireless fading effect in the ***,backup sub-channels(BSC) are arranged to help select sub-channels with better channel ***,to lower the overhead and improve the accuracy of the spectrum sensing,a partial sensing module is designed to enable the CUs to inherit and update the original idle spectrum list until it *** results show that the proposed scheme can realize higher throughput and lower sensing overhead with slight reduction of the forced termination probability(FTP) performance compared to the existing approaches.

关键词： cognitive radio link maintenance sensing overhead

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Group Controller-based Authentication for Machine Type Communication Under LTE network

Group Controller-based Authentication for Machine Type Commu...

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2016 2nd International Conference on Mechanical,Electronic and Information Technology Engineering(ICMITE 2016)

作者： Qi Pan Xiangming Wen Zhaoming Lu Huan Wu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Machine Type Communication(MTC) in the cellular network with ubiquitous coverage and various applications has played an important role in our daily life. For security, MTC devices need to follow the Evolved Packet system-Authentication and key Agreement(EPS-AKA) protocol to guarantee the secure requirements in the machine-to-machine(M2M) communications. However, a huge number of terminal devices tried to complete the authentication procedure simultaneously, which would bring a severe congestion and overload for the network. In this paper, we proposed an efficient, available and scalable group controller-based authentication and key agreement(GC-AKA) protocol for devices to ensure the safety in the long term evolution(LTE) network. Through a design of group controller and simplicity of devices' work in the authentication process, it would be more secure and efficient for resource-constrained devices in the communications between device and the cellular network, while providing simultaneous authentications for a mass of devices without congestion and overload in the network.

关键词： MTC LTE Group authentication authentication and key agreement congestion control

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Tri-Sectoring and Power Allocation of Macro Base Stations in Heterogeneous Cellular networks with Matern Hard-Core Processes

Tri-Sectoring and Power Allocation of Macro Base Stations in...

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IEEE Vehicular Technology Conference

作者： Mingzhe Chen Ye Hu Changchuan Yin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781509016990

In the practical heterogeneous cellular networks, a macro base station (MBS) is usually not located at the center of the macrocell and the distances from the MBS to its edges are also different. For this reason, the tri-sectoring method defined by 3GPP which divides three equal sectors and allocates each sector the same power may severely degrade the communication performance of the edge users. In this paper, we propose a novel tri-sectoring method and a MBS sector power allocation scheme for orthogonal frequency division multiple access based downlink of MBSs under co-channel deployment in heterogeneous cellular networks. We first evaluate the performance of 3GPP tri-sectoring method by using a hexagonal grid model and a Matern hard-core process (MHP) model, respectively, to demonstrate the inapplicability of 3GPP tri-sectoring method to the practical MHP model. Then, we devise a novel tri-sectoring method which considers load balancing and the directional radiation pattern of antennas. At last, a MBS sector power allocation scheme is proposed to control their downlink transmit power according to the downlink outage probability of edge macrocell users. Simulation results show that the proposed methods can improve the throughput of femtocell users and area spectral efficiency.

关键词： Matern hard-core process Tri-sectoring method Power allocation power splitting Cellular networks PPP1R12A gene main bang suppression 3GPP antenna radiation patterns macrocells Orthogonal frequency division multiplexing OFDMA spectral efficiency Sectoring Downlink

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