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IEEE Vehicular Technology Conference

作者： Kai Zhang Jin Xu Changchuan Yin Chunyu Pan Weiqiang Tan Guixian Xu Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence Beijing 100876 P. R. China Zhengzhou University of Light Industry School of Computer and Communication Engineering Zhengzhou 450001 P. R. China Guangzhou University School of Computer Science and Educational Software Guangzhou 510006 P. R. China Aalborg University Department of Electronic Systems Aalborg 9400 Denmark

ISBN: (纸本)9781538663592;9781538663585

Non-orthogonal multiple access schemes with higher spectral efficiency and the capability of accessing more users than orthogonal multiple access (OMA) scheme is preferred for the fifth generation (5G) wireless networks. In this work, a non-orthogonal transmission scheme called pattern division multiple access (PDMA) is proposed for the 5G wireless communication systems. Two pattern matrices are proposed for 150% and 200% overloaded PDMA systems. Then, a low complexity symbol-wise belief propagation iterative detection and decoding (BPIDD) algorithm for multiple user detection is proposed. Numerical results and analysis provided by utilizing extrinsic information transfer chart show that the proposed scheme outperforms the traditional OMA systems significantly, and the performance of the proposed scheme is better than that of the existing schemes up to 1 dB. Finally, simulation results show that the proposed scheme is superior to the existing schemes and the proposed BPIDD algorithm is better than that of the BP algorithm over 0.5 dB.

关键词： 5G mobile communication iterative decoding matrix algebra multi-access systems multiuser detection Multi access systems matrix algebra Multiuser detection Iterative decoding multiple access Wireless communication systems Scheme iterative receiver spectral efficiency Information Transfer

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A NOVEL USER-CENTRIC COMP SCHEME FOR ENERGY EFFICIENCY OF DENSE HETEROGENEOUS network 5

A NOVEL USER-CENTRIC COMP SCHEME FOR ENERGY EFFICIENCY OF DE...

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2016 5th IEEE International Conference on network Infrastructure and Digital Content(IC-NIDC 2016)

作者： Xueying Li Hailun Xia Zhimin Zeng Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications

ISBN: (纸本)9781509012473

In this paper,we investigate a user-centric Coordinated Multiple Point(CoMP) transmission scheme to improve Energy Efficiency(EE) in dense Heterogeneous network(HetNet),which takes advantage of both Dynamic Point Reduced Power(DPRP) and Joint Transmission(JT).DPRP with a user voting method rather than Dynamic Point Blanking(DPB) is introduced to fully use the power while reducing energy consumption and mitigating inter-cell *** pattern of reducing power is decided in a user-centric ***,CoMP user equipments(CUEs) report to two base stations(BSs) to inform their urgency of CUEs to reduce *** the BSs reduce power on some resource blocks(RBs) which affect most UEs so as to get EE *** with overlapping cooperation set is applied only to the CUEs to improve their throughput,therefore not bringing too much pressure to *** cooperation set of JT is decided by CUEs instead of the location of BSs to better adapt to the requirement of *** results show that the scheme we proposed can improve EE obviously without leading to too much drop in user throughput.

关键词： CoMP Power allocation Dense heterogeneous network Energy efficiency

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Cognitive radio enabled channel access for public bus network 2nd

Cognitive radio enabled channel access for public bus networ...

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2nd International Conference on Human Centered Computing, HCC 2016

作者： Liu, Xia Zeng, Zhimin Guo, Caili Feng, Chunyan Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9783319318530

Public bus network plays a significant role to enable public vehicle communications and allow for the exchange of safety and other types of information. The wireless access in vehicular environments protocol has been standardized over the 5.9 GHz as dedicated short range communications spectrum. Under the wireless access in vehicular environments standard mechanism, public bus nodes are not allowed to use service channels during control channel interval. This causes half of the service channel intervals to remain idle, which makes not sufficient spectrum for reliable exchange of information in public bus network. To alleviate this problem, we propose a system that employs cognitive network principles to increase the spectrum allocated and it outperforms in channel utilization and robust delivery of data. Simulation results confirm that the proposed scheme raised the spectrum utilization by 50 % compared to the performance under the wireless access in vehicular environments standard, which improves reliability for data transmission. © Springer International Publishing Switzerland 2016.

关键词： Cognitive radio

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ADAPTIVE RESOURCE ALLOCATION BASED ON SATISFACTION FOR LTE 5

ADAPTIVE RESOURCE ALLOCATION BASED ON SATISFACTION FOR LTE

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2016 5th IEEE International Conference on network Infrastructure and Digital Content(IC-NIDC 2016)

作者： Xinyu Liang Jiansong Miao Beijing Key Laboratory of Network Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781509012473

ICIC(inter-cell interference coordination)techniques are effectively applied into dense frequency reuse networks such as LTE(long term evolution).While mitigating the interference produced by nearby cells,researches only concentrate on maximum SINR or proportional fairness,without a consideration of various throughput *** adaptive resource allocation based on satisfaction(ARAS) algorithm is proposed not only to mitigate interferences but also to satisfy throughput demands *** utilizes eNBs(evolved-NodeBs) communications via X2 interface to allocate resources between *** cell is divided into two zones:cell-edge and cell-center,of which a satisfaction is always *** scheduler adjusts the resources allocation in a distributed manner related to the zone satisfaction *** results show that the proposed algorithm achieves a better satisfaction,meets different throughput demands and increases throughput fairness compared with reuse-1 model,FFR(fractional frequency reuse) and SFR(soft frequency reuse).

关键词： Adaptive resource allocation Satisfaction Inter-cell interference coordination LTE SFR

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Federated Echo State Learning for Minimizing Breaks in Presence in Wireless Virtual Reality networks

arXiv

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arXiv 2018年

作者： Chen, Mingzhe Semiari, Omid Saad, Walid Liu, Xuanlin Yin, Changchuan Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China Chinese University of Hong Kong Shenzhen518172 China Department of Electrical Engineering Princeton University PrincetonNJ08544 United States Department of Electrical and Computer Engineering University of Colorado Colorado Springs Colorado SpringsCO80918 United States Wireless@VT Bradley Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA24060 United States

In this paper, the problem of enhancing the virtual reality (VR) experience for wireless users is investigated by minimizing the occurrence of breaks in presence (BIP) that can detach the users from their virtual world. To measure the BIP for wireless VR users, a novel model that jointly considers the VR application type, transmission delay, VR video quality, and users’ awareness of the virtual environment is proposed. In the developed model, the base stations (BSs) transmit VR videos to the wireless VR users using directional transmission links so as to provide high data rates for the VR users, thus, reducing the number of BIP for each user. Since the body movements of a VR user may result in a blockage of its wireless link, the location and orientation of VR users must also be considered when minimizing BIP. The BIP minimization problem is formulated as an optimization problem which jointly considers the predictions of users’ locations, orientations, and their BS association. To predict the orientation and locations of VR users, a distributed learning algorithm based on the machine learning framework of deep (ESNs) is proposed. The proposed algorithm uses concept from federated learning to enable multiple BSs to locally train their deep ESNs using their collected data and cooperatively build a learning model to predict the entire users’ locations and orientations. Using these predictions, the user association policy that minimizes BIP is derived. Simulation results demonstrate that the developed algorithm reduces the users’ BIP by up to 16% and 26%, respectively, compared to centralized ESN and deep learning algorithms. Copyright © 2018, The Authors. All rights reserved.

关键词： Virtual reality

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An in-network caching scheme based on betweenness and content popularity prediction in content-centric networking 27

An in-network caching scheme based on betweenness and conten...

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27th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2016

作者： Xiaoqiang, Zhou Min, Zhao Muqing, Wu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781509032549

Content-centric networking (CCN) is considered as a promising architecture to achieve reliable content distribution at large scale. One of the key research items of CCN is cache strategy, and most of the existing approaches consider little of the dynamicity of user interests. In this paper, we present a new cache policy, named as the betweenness and content popularity prediction (BEACON). Betweenness measures the importance of nodes in the whole network, and content popularity represents the user preference for service contents. By taking into account both network topology characteristics and flow distribution, the load of network and server is optimized. Moreover, we use the gray model to predict the content popularity, tracking the trend of user interest. The simulation results demonstrate that the BEACON scheme can effectively improve the cache hit rate, shorten access distance and reduce the delay of transmission. © 2016 IEEE.

关键词： network topology

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Fog computing for vehicular Ad-hoc networks: paradigms, scenarios, and issues

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The Journal of China Universities of Posts and Telecommunications 2016年第2期23卷 56-65,96页

作者： Kang Kai Wang Cong Luo Tao School of Software Engineering Beijing University of Posts and Telecommunications Key Laboratory of Trustworthy Distributed Computing and Service Beijing University of Posts Telecommunications 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 Telecommunications

Vehicular Ad-hoc networks（VANETs） are kinds of mobile Ad-hoc networks（MANETs）, which consist of mobile vehicles with on-board units（OBUs） and roadside units（RSUs）. With the rapid development of computation and communication technologies, peripheral or incremental changes in VANETs evolve into a revolution in process. Cloud computing as a solution has been deployed to satisfy vehicles in VANETs which are expected to require resources（such as computing, storage and networking）. Recently, with special requirements of mobility, location awareness, and low latency, there has been growing interest in research into the role of fog computing in VANETs. The merging of fog computing with VANETs opens an area of possibilities for applications and services on the edge of the cloud computing. Fog computing deploys highly virtualized computing and communication facilities at the proximity of mobile vehicles in VANET. Mobile vehicles in VANET can also demand services of low-latency and short-distance local connections via fog computing. This paper presents the current state of the research and future perspectives of fog computing in VANETs. Moreover, we discuss the characteristics of fog computing and services based on fog computing platform provided for VANETs. In this paper, some opportunities for challenges and issues are mentioned, related techniques that need to be considered have been discussed in the context of fog computing in VANETs. Finally, we discuss about research directions of potential future work for fog computing in VANETs. Within this article, readers can have a more thorough understanding of fog computing for VANETs and the trends in this domain.

关键词： VANET fog computing cloud computing application vehicular cloud computing

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A Study on The Multi-Antenna Geometrical Depolarization Channel Modeling

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China Communications 2016年第3期13卷 105-114页

作者： SUN Xuehong YANG Xiaoli ZENG Zhimin ZHANG Cheng BAI Bing Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory of Intelligent Sensing for Desert Information School of Physics Electrical EngineeringNingxia UniversityYinchuan750021China

The traditional geometrical depolarization model that single transmitter to single receiver provides a simple method of polarization channel modeling. It can obtain the geometrical depolarization effect of each path if known the antenna configuration, the polarization field radiation pattern and the spatial distribution of scatters. With the development of communication technology, information transmission spectrum is more and more scarce. The original model provides only a single channel polarization state, so the information will be limited that the polarization state carries in the polarization modulation. The research is so significance that how to carries polarization modulation information by using multi-antenna polarization state. However, the present study shows that have no depolarization effect model for multi-antenna systems. In this paper, we propose a multi-antenna geometrical depolarization model. On the basis of a single antenna to calculate the depolarization effect of the model, and through simulation to analysis the main factors that influence the depolarization effect. This article provides a multi-antenna geometrical depolarization channel modeling that can applied to large-scale array antenna, and to some extent increase the speed of information transmission.

关键词： large-scale array antenna multi-antenna channel modeling depolarization effect cross polarization discrimination

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COFFEE-CUP: A cost-efficient routing strategy for delay tolerant networks using time-varying community partitioning 13

COFFEE-CUP: A cost-efficient routing strategy for delay tole...

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13th International Symposium on Wireless Communication systems, ISWCS 2016

作者： Lin, Guoping Liao, Qing Can, Deng Tianyi, Wang Zhao, Jingling 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)9781509020614

Delay Tolerant networks are a special kind of ad hoc networks that consist of a number of mobile devices. In DTNs, network topology frequently changes and source-to-destination communication paths can hardly be sustained. However, some social features have been observed in DTNs by analyzing the real mobile trajectories of DTNs. To utilize these social features to facilitate data routing, we present a community-based routing protocol that efficiently detects the community structure by using proposed time-varying community partitioning algorithm. For intracommunity routing, according to the remaining time-to-live of the message, the minimum number of message copies necessary to achieve a given delivery probability is calculated, which is the number of message copies utilized to spray in the current community. To facilitate intercommunity routing, we choose the gateway node that connects the next community frequently as relay. The evaluation of our strategy is conducted by extensive traced-driven simulations. The results of simulations confirm the effectiveness of our routing strategy. © 2016 IEEE.

关键词： Delay tolerant networks

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Asymmetrical And Direct Current Biased Optical OFDM for Visible Light Communication With Dimming Control

Asymmetrical And Direct Current Biased Optical OFDM for Visi...

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International Conference on Communications Workshops

作者： Namei Yin Caili Guo Yang Yang Pengfei Luo Chunyan Feng Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications China Research Department of HiSilicon Huawei Technologies Co. Ltd Beijing China

ISBN: (纸本)9781509015269

In visible light communication (VLC) systems, optical orthogonal frequency division multiplexing (O-OFDM) is an appealing modulation. Among many proposed O-OFDM schemes, both direct current biased O-OFDM (DCO-OFDM) and asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) are widely used. Since VLC needs to take the dual requirements of illumination and communication into account, different dimming levels are often required. For high and low dimming level scenarios, system with ACO-OFDM normally has a better spectral efficiency performance than system with DCO-OFDM due to the smaller clipping noise. However, regarding the middle dimming level scenarios, the DCO-OFDM generally outperforms the ACO-OFDM. In order to improve system spectral efficiency within the wide dimming range, an asymmetrical and direct current biased optical orthogonal frequency division multiplexing (AAD-OFDM) is proposed in this paper. In AAD-OFDM based system, the modulation scheme is switched between ACO-OFDM and DCO-OFDM according to the required dimming level. Therefore, by adopting the proposed AAD-OFDM, the VLC system can fully utilize the dynamic range of LED at any dimming levels thus improving the performance. Simulation results show that the proposed scheme has high spectral efficiency within a wide dimming range.

关键词： Visible Light Communication

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