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作者： Zelin Gong Ying Wang Tao Luo Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications

A shortage of licensed spectrum is a major hindrance to the capacity of Long Term Evolution for Metro(LTE-M) to carry urban rail transit services at *** by LTE-Unlicensed(LTE-U) offloading some of data traffic transmitted in licensed spectrum by accessing the unlicensed 5 GHz frequency band, we propose a queue-sensing-based Carrier Sensing Adaptive Transmission(CSAT) scheme for LTE-M in unlicensed spectrum based on *** scheme calculates the minimum amount of data that should be transmitted during current transmission duration by queue length at the beginning of each LTE-U cycle, according to which, LTE-U adjusts its duty cycle to meet the requirement of LTE-M *** paper focuses on the downlink transmission scheme for LTE-M in unlicensed spectrum, and verifies its performance by simulation, which tells that Queue-sensing-based CSAT will not only provide a reliable transmission for LTE-M services, but also maximize the fairness of channel occupancy in unlicensed spectrum.

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A Service-Based Intelligent Time-Domain and Spectral-Domain Flow Aggregation in IP-over-EON Based on SDON

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ZTE Communications 2019年第3期17卷 56-62页

作者： NI Dong LI Hui JI Yuefeng LI Hongbiao ZHU Yinan Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and TelecommunicationsBeijing 100876China Wireline Product Operation Division ZTE CorporationShenzhenGuangdong 518057China

The rapid growth of IP traffic has contributed to wide deployment of optical devices in elastic optical ***,the passband shape of wavelength selective switches(WSSs)that are used in reconfigurable optical add-drop multiplexer(ROADM)/optical cross connect(OXC)is not ideal,causing the narrowing of *** narrowing will lead to signal ***,guard-bands need to be inserted between adjacent paths which will cause the waste of *** this paper,we propose a service-based intelligent aggregation node selection and area division(ANS-AD)*** the rationality of the aggregation node selection,the ANS-AD algorithm chooses the aggregation nodes according to historical traffic information based on big data *** the ANS-AD algorithm divides the topology into areas according to the result of the aggregation node *** on the ANS-AD algorithm,we propose a time-domain and spectral-domain flow aggregation(TS-FA)*** the purpose of reducing resources'waste,the TS-FA algorithm attempts to reduce the insertion of guard-bands by time-domain and spectral-domain flow ***,we design a time-domain and spectral-domain flow aggregation module on software defined optical network(SDON)***,a simulation is designed to evaluate the performance of the proposed algorithms and the results show that our proposed algorithms can effectively reduce the resource waste.

关键词： IP-over-EON time-domain spectral-domain flow aggregation big data analysis SDON

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Inverse Design of Photonic Crystal Nanobeam Cavity Structure via Deep Neural network

Inverse Design of Photonic Crystal Nanobeam Cavity Structure...

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Asia Communications and Photonics Conference

作者： Jianjun Hao Lei Zheng Daquan Yang Yijun Guo Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 P. R. China

We propose a deep learning framework to solve the inverse design problem of one-dimensional photonic crystal nanobeam cavity structure. After training, we obtained an effective solution to the inverse design.

ISBN: (纸本)9781943580705

关键词： Genetic algorithms Inverse problems Nanophotonics Neural networks Photonic crystal cavities Quantum optics

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Cluster-Based Resource Selection Scheme for 5G V2X

Cluster-Based Resource Selection Scheme for 5G V2X

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IEEE Conference on Vehicular Technology (VTC)

作者： Jiaqi Zhao Xinxin He Huan Wang Xufei Zheng Jie Lv Tao Luo Xiaolin Hou Beijing Key Laboratory of Network System Architecture and Convergence Beijing China Beijing Laboratory of Advanced Information Network Beijing University of Posts and Telecommunications Beijing China NTT DOCOMO Beijing Labs Beijing China

The vehicle to everything communication in long term evolution (LTE V2X) supports vehicle-to-vehicle (V2V) communication directly via PC5 interface. In LTE V2X mode 4, vehicles autonomously select radio resources based on a distributed scheduling scheme. However, some researches show that this sensing based semi-persistent scheduling (SPS) scheme incurs low transmission reliability due to resource contention especially when the transmissions are aperiodic. Therefore, a cluster-based resource selection scheme is proposed to reduce the resource collision, where resources are divided into different resource sets and each cluster head selects its available resource set based on measurement. Simulation results show that, compared with LTE V2X mode 4, the proposed scheme has better performance for both periodic and aperiodic traffic.

关键词： Sensors Long Term Evolution Interference Vehicle-to-everything Energy measurement Indexes Vehicular ad hoc networks

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CSI-based device-free indoor localization using convolutional neural networks 4

CSI-based device-free indoor localization using convolutiona...

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4th IEEE International Conference on Computer and Communications, ICCC 2018

作者： Cai, Chenwei Deng, Li Li, Shufang Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781538683392

Device-free indoor localization is an emerging technology enabling the localization of a target without equipped any devices in an area of interest, which is widely applied in the field of security and home care. Interrupted by the multipath effect, previous Received Signal Strength (RSS) based localization systems often suffer from low accuracy when localization. Motivated by this, we explore the stability of channel state information (CSI) in IEEE 802.11n and propose a device-free indoor localization system based on CSI through convolutional neural networks (CNN), where we combine the space diversity, time diversity and frequency diversity of CSI to design the more abundant localization features. Moreover, we use a denoising method to improve the efficiency of extracting features from the human body's influence on the CSI and improve the accuracy of the localization. The experiment demonstrates that the average accuracy of the proposed method could reach more than 97% in a typical office. © 2018 IEEE.

关键词： Channel state information

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Geographic Routing Based on Social Dynamic Features Aware in Vehicle Social network 15

Geographic Routing Based on Social Dynamic Features Aware in...

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15th International Symposium on Wireless Communication systems, ISWCS 2018

作者： Liao, Qing Zhang, Jingyi Beijing Key Laboratory of Network System Architecture and Convergence Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781538650059

Vehicular ad-hoc network has the characteristics of Delay Tolerant network and social network. In this background, we take the social attributes of Delay Tolerant network as starting point and study the macroscopic dynamic features, micro dynamic features and dynamic contact features of vehicles. In this paper, we proposed a geographic multicast routing based on social dynamic features aware which solves messages transmission problems in vehicular ad hoc network. Different from the existing mobility-aware geocast algorithm, our algorithm takes into account not only the relationships between vehicles mobility and geographical location, but also the contact features between vehicles and destination areas. Finally, it is proved that our algorithm is superior to the existing mobilityaware geocast algorithm in term of delivery rate, network overhead and average delay by the real mobile data model simulation in large vehicular ad-hoc network. The results prove the effectiveness of our algorithm, and the routing protocol we proposed is suited for large urban vehicular ad hoc networks. © 2018 IEEE.

关键词： Vehicular ad hoc networks

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Proposal generation by learning visual relationship 4

Proposal generation by learning visual relationship

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4th IEEE International Conference on Computer and Communications, ICCC 2018

作者： Dong, Yahui Zhou, Wenli Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781538683392

Proposal generation aims to generate bounding box candidates that contain objects. The key for proposal generation is to produce very few bounding boxes that can achieve high recall. In this paper, we propose a novel proposal generation algorithm which introduces visual relationship into proposal generator. The intuition is that objects always exist in co-occurrence, which can be clues for generating proposals coherently. Specifically, it is achieved by concatenating a novel relationship network with region proposal network, and jointly training them end-to-end. Experimental results on Visual Relationship demonstrate that our method can achieve better performance compared with state-of-the-art, especially when evaluating at the top limited number of generated proposals. © 2018 IEEE.

关键词： Object detection

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Robustness analysis of interdependent PV grids and communication network based on complex network

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The Journal of China Universities of Posts and Telecommunications 2018年第5期25卷 60-66页

作者： Fan Xinwen Wen Xiangming Lu Zhaoming Sun Chunlei Han Xi School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications Electronic Information Engineering North China University of Technology

Currently,the photovoltaic（ PV） cloud network is an important research point in energy Internet. From the perspective of the robustness analysis of PV cloud network,traditional robustness index,the relative size of the giant connected component before and after the cascading,which is focused on the giant component,is not appropriate for the distributed PV network because of the big difference between PV generators and large power grid. In this paper,a new index is proposed,the minimum removed nodes number（ MRNN）,which can make the entire system collapse,to evaluate the robustness of PV cloud network system. Simulation results show that MRNN can clearly indicate the system robustness under different parameters.

关键词： cascading failure interdependent system minimum removed nodes number （MRNN）

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Optimized Polarization Filtering Based Self-Interference Cancellation Scheme for Full-Duplex Communication

Optimized Polarization Filtering Based Self-Interference Can...

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IEEE Global Conference on Signal and Information Processing (GlobalSIP)

作者： Fengqi Bai Fangfang Liu Chunyan Feng Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

In this paper, we propose an optimized polarization filtering based digital self-interference (SI) cancellation (OPC) scheme for full-duplex communication. The proposed OPC scheme utilizes polarization to increase the distinction between the desired signal and the SI and maximizes the signal to interference plus noise ratio (SINR) of the output signal. In order to achieve an optimal trade-off between the desired signal reception and the SI cancellation, an appropriate polarization state (PS) should be selected on the great circle polarization track, which is determined by the PSs of both the SI and the desired signal. Analysis and numerical results demonstrate that the proposed scheme can guarantee that the SINR gain is always positive in the case of any polarization dissimilarity coefficient. In addition, the performance of the OPC scheme can reach the theoretical upper limit in polarization SI cancellation schemes.

关键词： Signal to noise ratio Interference cancellation Receivers Phase change materials Gain Power dividers

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Segment-Based Joint Caching and Recommendation Optimization for Mobile Video Transmission

Segment-Based Joint Caching and Recommendation Optimization ...

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IEEE Globecom Workshops

作者： Hongzhang Wang Wenpeng Jing Xiangming Wen Zhaoming Lu Shuyue Zhao Beijing Key Laboratory of Network System Architecture and Convergence Beijing Laboratory of Advanced Information Networks School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9781728109602

ISBN: (纸本)9781728109619

Mobile edge caching is able to reduce transmission latency and relieve the traffic load of backhaul links in the delivery of mobile video contents. However, the content caching remains a challenging problem considering the relatively limited cache capacity and the heterogeneous user demand. Recommendation system, with the ability to shape users' demand, can be leveraged to improve the performance of mobile edge caching efficiency. In this paper, the caching policies and recommendation strategies are designed for the cache-enabled wireless networks. Considering popularity difference among segments in a single video content, a more fine-grained segment-based proactive caching policy is introduced, which is different from the existing works that focus on content-level caching. Besides, the impact of recommendation system on users' request patterns is taken into account. In order to effectively reduce the content transmission latency, a joint caching and recommendation optimization problem is formulated. Due to the NP-hard nature, the problem is divided into two convex subproblems and a heuristic iterative algorithm is proposed. Numerical simulation results show that the proposed algorithm outperforms the existing algorithms in terms of both average transmission latency and cache hit ratio.

关键词： Optimization Internet Shape Wireless networks Numerical models Numerical simulation Bandwidth

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