检索结果-内蒙古大学图书馆

Asia Communications and Photonics Conference, ACP 2013

作者： He, Shan Shou, Guochu Hu, Yihong Guo, Zhigang Beijing Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

We apply network virtualization to remove the differences between heterogeneous networks in Fiber-Wireless (FiWi) network to establish intelligent multipath access through the flexible use of virtual networks (VNs) de... 详细信息

ISBN: (纸本)9781557529893

关键词： Heterogeneous networks

来源：评论

学校读者我要写书评

暂无评论

Based on time-delay and bandwidth relay selection algorithm for radio and television services

Based on time-delay and bandwidth relay selection algorithm ...

引用

2013 4th International Conference on Material and Manufacturing Technology, ICMMT 2013

作者： Zhang, Chao Yi Wu, Mu Qing Luan, Lin Lin Xu, Chun Xiu School of Science and Technology Beijing Forestry University Beijing 100083 China Laboratory of Network System Architecture and Convergence Beijing University of Post and Telecommunications Beijing 100876 China

ISBN: (纸本)9783037857526

Proposed a relay routing method for Radio and TV services, the method through obtaining the node's time-delay and power information, obtained the value of the system interrupt decisions, and as a decision threshold to select the relay node. While in consideration of link priorities and fairness, designed a relay routing protocol that can dynamically change the route when the network changed. Simulation results show that this protocol can be expanded coverage, reduced communication blind spots, increase system throughput and enhance the quality of service. © (2013) Trans Tech Publications, Switzerland.

关键词： Bandwidth

来源：评论

学校读者我要写书评

暂无评论

Interference mitigation scheme for cognitive femtocell networks

Interference mitigation scheme for cognitive femtocell netwo...

引用

National Doctoral Academic Forum on Information and Communications Technology 2013

作者： Qing, Haobo Liu, Yuanan Xie, Gang Gao, Jinchun Beijing Key Laboratory of Work Safety Intelligent Monitoring School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781849198196

The interference problem is a bottleneck of femtocell development as more and more femtocells are deployed. This paper considers interference from macro-cell as well as femtocells and puts forward a novel interference avoidance scheme. The proposed scheme employs cognitive radio technology which can sniff the resources usage to obtain the real-time environment information, and then allocates the frequency resources to femtocell network. In this way, interference mitigation is fulfilled. Simulations verify that the proposed scheme is able to achieve higher capacity and lower interference than the classical dedicated channel and co-channel deployment schemes.

关键词： Femtocell

来源：评论

学校读者我要写书评

暂无评论

A novel parametric channel estimation approach for OFDM systems

A novel parametric channel estimation approach for OFDM syst...

引用

2013 International Conference on Information and network Security, ICINS 2013

作者： Qing, Haobo Liu, Yuanan Xie, Gang Liu, Kaiming Liu, Fang Beijing Key Laboratory of Work Safety Intelligent Monitoring School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunication Beijing China

ISBN: (纸本)9781849197298

This paper proposes a novel parametric channel estimation approach for orthogonal frequency-division multiplexing (OFDM) systems. The method is composed of two parts: estimation of channel parameters and estimation of channel coefficients. The exponentially embedded family (EEF) criterion is exploited to determine the number of channel paths as well as the multipath time delays. Based on these parameters, channel frequency responses are estimated. Additionally, our scheme is computational efficient due to the needless of eigenvalue decomposition (EVD) or the estimation of signal parameters by rotational invariance technique (ESPRIT). Simulations are provided to validate the performance of our algorithm from the perspectives of channel parameter error probability (CPEP) and mean square error (MSE).

关键词： Orthogonal frequency division multiplexing

来源：评论

学校读者我要写书评

暂无评论

A novel metric for cache size allocation scheme in Content Centric networking

A novel metric for cache size allocation scheme in Content C...

引用

National Doctoral Academic Forum on Information and Communications Technology 2013

作者： Cui, Xiandong Liu, Jiang Huang, Tao Chen, Jianya Liu, Yunjie Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China Future Network Industry Innovation Center of China Nanjing 211100 China

ISBN: (纸本)9781849198196

Caching scheme will change the original feature of the network in Content Centric networking (CCN). So it becomes a challenge to describe the caching node importance according to network traffic and user behavior. In this work, a new metric named Request Influence Degree (RID) is defined to reflect the degree of node importance. Then the caching performance of CCN has been addressed with specially focusing on the size of individual CCN router caches. Finally, a newly content store space heterogeneous allocation scheme based on the metric RID across the CCN network has been proposed. Numerical experiments reveal that the new scheme can decrease the routing stretch and the source server load contrasting that of the homogeneous assignment and several graph-related centrality metrics allocations.

关键词： Behavioral research

来源：评论

学校读者我要写书评

暂无评论

Secure cloud storage management method based on time stamp authority

Secure cloud storage management method based on time stamp a...

引用

National Doctoral Academic Forum on Information and Communications Technology 2013

作者： Lin, Wen-Hui Lei, Zhen-Ming Liu, Jun Yang, Jie Liu, Fang He, Gang Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunication Beijing 100876 China Technology Research Institute Aisino Corporation Beijing 100195 China

ISBN: (纸本)9781849198196

We present a fundamentally different approach to improve the security of cloud storage. In contrast to previous methods, our approach introduces third party trusted timestamp and certificate into Cloud storage framework. And user's request is multiply validated. There are three main aspects. (i) Certificate identifies the user's identity;(ii) Trusted timestamp is added to the user's operation request;(iii) Cloud storage system communicates with TSA and Directory server for user information verification. Furthermore, our approach has two important features. First, we use PKI technology to improve cloud storage system security, and through Directory server to authenticate the user certificate status. Second, Cloud storage vets user's operation requests based on trusted timestamps and stores user's operation records, which can provide security services including safety audit, electronic evidence and other services. Our results show that our mechanism can vet and monitor various types of data operations in cloud storage system under the premise of increasing a very small overhead, and the security of cloud storage has greatly enhanced.

关键词： Cloud storage

来源：评论

学校读者我要写书评

暂无评论

Multi-path interests routing scheme for Multi-path data transfer in Content Centric networking

Multi-path interests routing scheme for Multi-path data tran...

引用

National Doctoral Academic Forum on Information and Communications Technology 2013

作者： Zhang, Yan Liu, Jiang Huang, Tao Chen, Jianya Liu, Yunjie Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China Future Network Industry Innovation Center of China Nanjing 211100 China

ISBN: (纸本)9781849198196

Content Centric networking (CCN) is one of the most promising future network architectures. Current researches on CCN routing scheme mainly focus on finding the best single routing path and then transferring all the content chunks along this path. For an Interest packet who should have had opportunities to be routed along multiple paths to reach more repositories but only been routed along one single path due to the single path routing scheme, the problems of low utilization of the network resources and unbalance of the load of the faces and repositories are caused. This paper focuses on how to make best use of multiple paths to route the Interests, and further transfer different chunks of the content back along the paths. According to the different network-status parameters, a Multi-path Interests Routing (MIR) scheme is proposed for CCN routing, which is based on Analytical Hierarchy Process (AHP). AHP is a method for obtaining the optimized result of the Interest packets allocation. The simulation experiments have been performed to evaluate the proposed scheme in terms of a wide range of performance metrics. The results show that the proposed scheme significantly outperforms existing scheme.

关键词： network architecture

来源：评论

学校读者我要写书评

暂无评论

Parallelized Jaccard-Based Learning Method and MapReduce Implementation for Mobile Devices Recognition from Massive network Data

引用

China Communications 2013年第7期10卷 71-84页

作者：刘军李银周 Felix Cuadrado Steve Uhlig 雷振明 Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Department of Electronic Engineering and Computer Science Queen MaryUniversity of London

The ability of accurate and scalable mobile device recognition is critically important for mobile network operators and ISPs to understand their customers' behaviours and enhance their user *** this paper,we propose a novel method for mobile device model recognition by using statistical information derived from large amounts of mobile network traffic ***,we create a Jaccardbased coefficient measure method to identify a proper keyword representing each mobile device model from massive unstructured textual HTTP access *** handle the large amount of traffic data generated from large mobile networks,this method is designed as a set of parallel algorithms,and is implemented through the MapReduce framework which is a distributed parallel programming model with proven low-cost and high-efficiency *** using real data sets show that our method can accurately recognise mobile client models while meeting the scalability and producer-independency requirements of large mobile network *** show that a 91.5% accuracy rate is achieved for recognising mobile client models from 2 billion records,which is dramatically higher than existing solutions.

关键词： mobile device recognition data mining Jaccard coefficient measurement distributed computing MapReduce

来源：评论

学校读者我要写书评

暂无评论

An adaptive cross-layer optimization scheme for light compressed High-definition Video Transmission Based on 60 GHz system

An adaptive cross-layer optimization scheme for light compre...

引用

2013 15th IEEE International Conference on Communication Technology

作者： Wei Zhang Danpu Liu Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence

ISBN: (纸本)9781479900763

By using 60GHz spectrum in high frequency carrier,IEEE 802.11ad is widely used in the transmission of high-definition *** this paper,an adaptive cross-layer optimization scheme is proposed based on IEEE 802.11ad which involves modulation and coding at the physical layer,retransmission policy at the medium access control layer and source coding at the video coding *** scheme aims at minimize the video distortion between original video at sending end and reconstructed video at receiver under certain time *** results show that the proposed scheme can select a proper combination of parameters at each layer mentioned above for a given SNR and greatly improve the overall performance in minimizing the video distortion.

关键词： IEEE 802.11ad HD video cross-layer optimization source coding modulation and coding retransmission

来源：评论

学校读者我要写书评

暂无评论

Optimization of Handover Measurement Procedure for TD-LTE networks in Mountainous Scenario

Optimization of Handover Measurement Procedure for TD-LTE Ne...

引用

2013 15th IEEE International Conference on Communication Technology

作者： Jiansong Miao Ankang Zhang Yan Wang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479900763

Handover(HO) is a key procedure in long term evolution(LTE) *** paper makes a detailed introduction on two aspects in HO measurement procedure—Layer3 filtering theory and the radio link failure(RLF) *** the channel environment in mountainous scenario has a great effect on received signal,we have made researches and optimizations on user equipment(UE) measurement signal *** procedure based on Layer3(L3) filtering and optimized RLF procedure are designed and implemented in a dynamic system level simulation platform which models the mountainous *** UE measured Reference Signal Received Power(RSRP) of source and target eNodeB with different L3 filtering factor have been measured to make a comparison and select the best ***-pong HO rate and RLF rate are used to evaluate the influence of L3 filtering to HO *** results show that the best L3 filtering factor is 1/6 and the optimized RLF procedure is effective in mountainous *** paper presents a new fast interpolation method based on edge *** method extracts image edge by improved canny operator which has two specified thresholds *** for different areas,it chooses different *** can keep edge details while doing quick *** experimental results show that the effect of this method can hold the edge details very well,and it is obviously superior to the traditional *** method provides a better initial image for the super resolution reconstruction.

关键词： Layer3 filtering Radio link failure Mountainous scenario RSRP

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：