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10th International Conference on Wireless Communications, networking and Mobile Computing, WiCOM 2014

作者： Gao, Wenting Hao, Jianjun Guo, Yijun Beijing Key Laboratory of Network System Architecture and Convergence BUPT Beijing China

ISBN: (纸本)9781849198455

Recent years wireless networks have witnessed an explosive growth in enhanced multimedia broadcast and multicast service (eMBMS). Scalable video coding (SVC) streaming is a mainstream coding in eMBMS. In this paper we present a novel eMBMS user cooperative erasure recovery mechanism based on network coding where SVC streaming and layer network coding are broadcasted by source node. Local cooperative repair together with network coding is used to save total overhead of links and reduce the retransmission times, for purpose of improving Quality of Service (QoS) of video streaming. The simulation results show that the number of retransmissions declines a lot through our mechanism. Local user cooperation saves link overhead as much as 55% when sender disseminates SVC streaming. Combining with layer network coding, the overhead can also be reduced about 17%.

关键词： Recovery

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Interference-aware picocells coordination resource allocation in heterogeneous OFDMA networks

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Journal of Information and Computational Science 2015年第2期12卷 475-484页

作者： Zhao, Jun Lu, Zhaoming Wen, Xiangming Zheng, Wei Zhang, Zhicai Jing, Wenpeng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

Macrocells may suffer serious interference generated by the deployment of co-channel picocells. In this paper, a resource allocation algorithm based on base station coordination and pricing mechanism for downlink co-channel Orthogonal Frequency-division Multiple-access (OFDMA) picocells is proposed to increase capacity of picocells, and alleviate their interference to macrocells. The resource allocation problem is modeled as a potential game, and a distributed subchannel and power allocation algorithm are proposed to implement the resource allocation game. Simulation results show that the proposed algorithm not only improves the capacity of the picocells but also the total capacity of the macrocell, as compared with the unpriced resource allocation, constant step power allocation and Improved Iterative Water Filling (IIWF). Copyright © 2015 Binary Information Press.

关键词： Frequency division multiple access

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Design and Realization of Cognitive Routing Resources Using Big Data Analysis in SDN

Design and Realization of Cognitive Routing Resources Using ...

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IEEE International Conference on Services Economics (SE)

作者： Hongyan Cui Yuchen Zhang Chenhang Ma Wei Lai Norman C. Beaulieu Stanislav Sobolevsky Yunjie Liu Key Lab of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing P. R. China MIT SENSEable City Laboratory State Key Lab. of Networking and Switching Technology

Future networks need to get knowledge of users' requirements by analyzing big data to achieve intelligence. OpenFlow is the first standard communications interface defined between the control and forwarding layers of a SDN architecture. So as to enhance network flexibility and availability, this paper presents a network resource allocation scheme equipped with the ability of user preference awareness, by connecting a cloud platform of analyzing users' data. We use the Hadoop platform to predict the rate and type of the incoming flows and employ them to get the lightest burden link through the LARAC algorithm. It has been verified on the BUPT SDN test bed that this system is capable of allocating the network resources dynamically by predicting the network load in advance. The results show that the proposed methods achieve better load balance than previous networks.

关键词： Routing Resource management Prediction algorithms Databases Control systems network topology Algorithm design and analysis

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A QoE-Driven FEC Rate Adaptation Scheme for Scalable Video Transmissions over MIMO systems

A QoE-Driven FEC Rate Adaptation Scheme for Scalable Video T...

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IEEE International Conference on Communications

作者： Xiang Chen Haiqing Du Jenq-Neng Hwang James A. Ritcey Chung-Nan Lee Department of Electrical Engineering University of Washington Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Department of Computer Science and Engineering National Sun Yat-Sen University

ISBN: (纸本)9781467364300

We propose a forward error correction (FEC) coding rate adaptation scheme which maximizes the quality of experience (QoE), for scalable video coding (SVC) based video transmissions over multi-input multi-output (MIMO) systems. The proposed scheme adaptively selects the best set of spatial channels, number of video layers and their corresponding FEC coding rate according to channel state information (CSI) from the receiver. Unlike previous work, our proposed scheme distributes the FEC encoded bit streams to multiple spatial channels so that additional diversity gains can be obtained. Due to the complexity of the optimization, we decompose the original problem into several sub-problems, which can then be solved by a heuristic algorithm. The optimal solution can be found by choosing the best among all the candidate solutions obtained from the sub-problems. The effectiveness and superb performance of our proposed scheme can be demonstrated by many simulations with different videos and channel conditions.

关键词： FEC QoE SVC MIMO Rate adaptation

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Preparation and application on antenna of soft ferrite core for wireless sensor networks

Preparation and application on antenna of soft ferrite core ...

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International Conference on Magnetics (INTERMAG)

作者： L. Li Y. Fang Y. Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing Beijing Engineering Laboratory of Advanced Metallic Magnetic Materials and Preparation Techniques Beijing Functional Materials Research Institute Central Iron and Steel Research Institute Beijing

In this paper, high performance of soft Mn-Zn ferrites were prepared and further design of specific antenna of the nodes in particular embedded wireless sensor network was made using ferrite core to explore the influe... 详细信息

关键词： Antennas Ferrites Wireless sensor networks Magnetic field measurement Soft magnetic materials Sensors Antenna measurements

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Nash bargaining solution based multi-cell and multi-user interference alignment scheme for cellular networks

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The Journal of China Universities of Posts and Telecommunications 2014年第4期21卷 1-7,14页

作者： NIU Qin ZENG Zhi-min ZHANG Tian-kui GAO Qiu-bin SUN Shao-hui 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 State Key Laboratory of Wireless Mobile Communications China Academy of Telecommunication Technology

In wireless cellular networks, the interference alignment （IA） is a promising technique for interference management. A new IA scheme for downlink cellular network with multi-cell and multi-user was proposed, in the proposed scheme, the interference in the networks is divided into inter-cell interference （ICI） among cells and inter-user interference （IUI） in each cell. The ICI is aligned onto a multi-dimensional subspace by multiplying the ICI alignment precoding matrix which is designed by the singular value decomposition （SVD） scheme at the base station （BS） side. The aligned ICI is eliminated by timing the interference suppression matrix which is designed by zero-forcing （ZF） scheme at the user equipment （UE） side. Meanwhile, the IUI is aligned by multiplying the IUI alignment precoding matrix which is designed based on Nash bargaining solution （NBS） in game theory. The NBS is solved by the particle swarm optimization （PSO） method. Simulations show that, compared with the traditional ZF IA scheme, the proposed scheme can obtain higher data rate and guarantee the data rate fairness of UEs with little additional complexity.

关键词： cellular network interference alignment Nash bargaining solution data rate fairness particle swarm optimization

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Estimating the Upper Bound of Transmission Capacity in Linear VANET

Estimating the Upper Bound of Transmission Capacity in Linea...

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International Wireless Communications and Mobile Computing Conference

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

ISBN: (纸本)9781479953455

The IEEE 802.11p VANET has been studied by academia and industry for many years. In this paper the upper bound of transmission capacity in linear VANET is deduced and evaluated. The maximum of simultaneous transmitters within dedicated areas, which is widely accepted as the indicator of transmission capacity, is constrained by the CSMA/CA or EDCA mechanism in 802.11p. To estimate the upper bound, a linear road scenario is built and one determined uniform distribution of transmitting vehicles is proved to contain maximal number of simultaneous transmitters;then the upper bound of transmission capacity is proposed;finally simulation results show that the bound offers a good constraint for the transmission capacity in linear VANET.

关键词： VANET Transmission Capacity CSMA/CA Simultaneous Transmitters

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A novel ser and PAPR reduction scheme for complex field network coding 10

A novel ser and PAPR reduction scheme for complex field netw...

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10th International Conference on Wireless Communications, networking and Mobile Computing, WiCOM 2014

作者： Li, Pan Hao, Jianjun Guo, Yijun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781849198455

For multi-source relay-based cooperative communications, it is widely believed that Complex Field network Coding (CFNC) achieves better throughput performance than Physical-layer network Coding (PNC). However, traditional CFNC schemes suffer a considerable loss on the performance of symbol to error ratio (SER) and peak-toaverage power ratio (PAPR) as the number of source nodes increases. In this paper, to tackle this problem in some extent, a novel CFNC scheme, which comprises of two SER and PAPR reduction algorithms, is proposed and analyzed. Particularly, by optimizing the complex coefficient vector at the source nodes at first, the performance of SER is improved;while by shrinking the amplitude of some signals selectively, the PAPR at the destination nodes is reduced. Simulations are provided to validate our analytical results. From the simulation results, it is observed that the proposed CFNC scheme significantly improves the performance of SER and PAPR.

关键词： network coding

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Transmission mode selection for downlink transmission in LTE-A networks

Transmission mode selection for downlink transmission in LTE...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Jian Yu Geoffrey Ye Li Changchuan Yin Xiaolong Zhu Yusun Fu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia USA Huawei Shanghai Research Institute Shanghai China

In this paper, we investigate mode selection for coordinated multi-point (CoMP) transmission in downlink LTE-A networks, where inter-cluster interference exists. The proposed scheme selects the single-cell (SC) or coordinated beamforming (CB) transmission mode according to interference level to maximize the weighted sum rate with fairness consideration. To formulate the optimization problem, an approximated closed-form expression for the achievable rate is derived by modeling the probability distributions of signal and interference powers as Gamma distributions. Since the original optimization problem is a combinatorial and non-convex one with high complexity, a low-complexity and sub-optimal algorithm is proposed, which first performs coordinated cell selection and then transmission mode selection. Simulation results show that the closed-form approximation of the achievable rate is very tight and the proposed mode selection scheme can improve the average system throughput by 13% and the 10th percentile user throughput by 10% compared with the existing scheme.

关键词： Interference Optimization Approximation methods Closed-form solutions Downlink Signal to noise ratio Land mobile radio

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A Bi-direction hybrid routing algorithm in mobile hybrid wireless networks 10

A Bi-direction hybrid routing algorithm in mobile hybrid wir...

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10th International Conference on Wireless Communications, networking and Mobile Computing, WiCOM 2014

作者： Li, Xiaolong Hao, Jianjun Guo, Yijun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Post and Telecommunications Beijing China

ISBN: (纸本)9781849198455

In this paper, we propose an efficient routing algorithm based on AODV for the Mobile Hybrid Wireless networks (MHWNs), which consists of the mobile ad hoc networks (MANETs) and an infrastructure wireless networks (such as cellular networks). In MANETs, the performance of the networks has been greatly challenged by the mobility from nodes and link state changes, while the link in cellular networks remains stable link with the mobile stations. This algorithm for routing construction takes advantage of the features of MHWNs, such as hybrid radio channels and nodes heterogeneity, to accomplish the bi-direction routing discovery on demand. Our results show that the performance of MHWNs is improved in the time and overhead for route path discovery process the under our bi-direction route algorithm.

关键词： Routing algorithms

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