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检索条件"机构=Key Lab of Network Communication System and Control"

共 188 条记录，以下是71-80 订阅

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Indexing of constrained moving objects for current and near future positions in GIS

Indexing of constrained moving objects for current and near ...

引用

First International Multi- Symposiums on Computer and Computational Sciences, IMSCCS'06

作者： Jing, Guo Wei, Guo Dongru, Zhou School of Computer Science Wuhan University Wuhan 430072 China State Key Lab. of Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai 200030 China

ISBN: (纸本)0769525814

In Geographic Information system (GIS), fast and efficiently indexing moving objects are a crucial issue in several application domains, such as LBS, Intelligence Transportation and Digital Battle. In this paper, a new index structure, PQR-tree, is proposed to fast update and efficiently index the present or near future positions of constrained moving objects based on the characters of moving objects. PQR-tree is an integrated tree structure which combined PMR Quadtree, Quadtree and R*-tree together. Firstly, QR-tree which combined Quadtree and R*-tree is used to carry out rough level partition for index space based on range region. Next, an R*-tree is used to index quasi-static objects for each subspace. Then, using a splitting rule of PMR Quadtree to carry further level partition for index space based on road networks and all fast moving objects are related to the road networks. The experimental results show that PQR-tree achieves better performance for index updating and query evaluation than TPR-tree. © 2006 IEEE.

关键词： Geographic information systems

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A distributed inter-cell interference coordination scheme between femtocells in LTE-advanced networks

A distributed inter-cell interference coordination scheme be...

引用

2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring

作者： Hu, Fanglong Zheng, Kan Lei, Lei Wang, Wenbo Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing 100876 China Wireless System Lab China Mobile Research Institute Beijing 100053 China

ISBN: (纸本)9781424483310

Due to the dense and self-deployment of home eNodeBs (HeNBs) in femtocells, serious inter-cell interference may arise without good coordination. To deal with it, a distributed interference coordination scheme for femtocells networks with carrier aggregation (CA) is proposed in this paper. Firstly, each femtocell operates on all the component carriers (CCs) of the network and gathers the information needed via local measurements. Then, based on the measurements, decisions of maintaining or releasing the component carrier are individually made by each femtocell on each component carrier. Simulation results validate the effectiveness of our proposed scheme in term of the signal to interference and noise ratio (SINR) and throughput. © 2011 IEEE.

关键词： Femtocell

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Step-size optimization EASI algorithm for blind source separation

Step-size optimization EASI algorithm for blind source separ...

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2007 International Conference on Computational Intelligence and Security, CIS'07

作者： Weihong, Fu Xiaoniu, Yang Naian, Liu State Key Lab. of Integrated Service Networks Xidian University Xi'an 710071 China National Laboratory of Information Control Technology for Communication System Jiaxing Zhejiang 31403 China

ISBN: (纸本)0769530729

Aiming at the problem of blind source separation of the communication signals, we propose a step size optimization equivariant adaptive source separation via independence (SO-EASI) algorithm basing on the EASI block based algorithm. This algorithm adjusts the step-size by the steepest descent method and thereby greatly increases its convergence speed whatever value the step-size is initialized. Simulation results show that SO-EASI algorithm can effectively blindly separate the communication signals and these results also support the expected improvement in convergence speed of the approach. © 2007 IEEE.

关键词： Blind source separation

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Interference coordination between femtocells in LTE-advanced networks with carrier aggregation

Interference coordination between femtocells in LTE-advanced...

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作者： Zheng, Kan Hu, Fanglong Lei, Lei Wang, Wenbo Wireless Signal Processing and Network Lab. Key Laboratory of Universal Wireless Communication Beijing University of PostsandTelecommunications Beijing 100088 China Wireless System Lab. China Mobile Research Institute Beijing 100053 China

ISBN: (纸本)9780984589333

Femtocells technology has emerged as a promising solution to provide the indoor coverage in the 3rd generation (3G) long-term evolution (LTE) and its advanced (LTE-Advanced) networks. In this paper, we propose a two-step interference coordination scheme to deal with the interference between femtocells in LTE-Advanced networks with carrier aggregation. Each femtocell is assigned a carrier that is non-overlapping with its interfering femtocells or has the least interference in the first step. Then, in the second step, more carriers are attempted to be used by a femtocell in order to improve the system spectrum efficiency based on the specified utility functions. Our simulation results demonstrate the effectiveness of the proposed interference coordination scheme in terms of throughput.

关键词： Femtocell

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Dynamic space-covered broadcast algorithm based on neighbor-degree in mobile ad hoc wireless networks

Dynamic space-covered broadcast algorithm based on neighbor-...

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2020 International Conference on Machine Learning and Intelligent systems, MLIS 2020

作者： Lou, Qiaoqiao Zhao, Zhijin School of Telecommunication Engineering Hangzhou Dianzi University China State Key Lab of Information Control Technology in Communication System of No.36 Research Institute China Electronic Technology Corporation China

ISBN: (纸本)9781643681368

Broadcast is an important link in mobile ad hoc wireless networks (MANETs). In order to improve broadcast coverage, reduce forwarding probability and broadcast collision, a dynamic space-covered broadcast algorithm based on neighbor-degree in MANETs is proposed. The concepts of neighbor-degree, available-angel and available-distance are introduced. The neighbor-degree is used to generate the initial forwarding probability of a node. Based on the available-angle and available-distance, the node weight is proposed to calculate the final forwarding probability, thereby realizing the dynamic selection of forwarding node and reflecting the dynamic space-covered of node. The forwarding strategy is proposed to reduce broadcast collision. Simulation results show that, compared with dynamic probability broadcast and node location based space-covered broadcast, proposed broadcast algorithm reduces the broadcast collision, improves the broadcast coverage, and reduces the forwarding probability when the number of nodes is large. © 2020 The authors and IOS Press.

关键词： Probability

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Common Caching Replacement Algorithm for Video-on-Demand system

Common Caching Replacement Algorithm for Video-on-Demand Sys...

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International Conference on Web Information systems and Mining (WISM)

作者： Fengbin Li Jun Li Zhong Hu Jun Zhou Key Laboratory of Network Communication System and Control CAS University of Science and Technology Hefei Anhui China

As the streaming media files growing larger and larger in size, it inevitably aggravates the network congestion and user perceive latency, to settle problem lots of caching algorithms have been applied in video-on-demand (VOD)system. However, different algorithm is correspondence to an unique caching replacement policy, which limits its applications and the effects are not very satisfied, so in VOD aspect it is necessary to find a common replacement algorithm. In this paper, we propose a Common Caching Replacement Algorithm (CCRA). As a unification replacement algorithm, it sufficiently considers the recent visit and segment size, effectively solves the disk I/O bandwidth bottleneck limitation and improves byte hit rate. We respectively replace the previous caching replacement policy in Uniform segmentation algorithm and Exponential segmentation algorithm with CCRA. From the experimental comparison, Uniform segmentation with CCRA improves almost 5\% in disk reduce ratio, and exponential segmentation with CCRA increases near 8\% in byte hit ratio.

关键词： Streaming media Bandwidth Delay Spine Information systems laboratories Size control communication system control control systems IP networks

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VCR Functionalities with Adaptive Rate Adjustment in Streaming Media Server

VCR Functionalities with Adaptive Rate Adjustment in Streami...

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International Conference on Computer and Information Technology (CIT)

作者： Zhou Jun Li Jun Zhu Ming Key Laboratory of Network Communication System and Control CAS University of Science and Technology Hefei Anhui China

Due to the decoding dependency of MPEG coded frames, lots of dependent frames are transmitted at video cassette recording (VCR) operations, thus more computation resource, hard disk and network bandwidth are consumed on streaming media server, and higher decoding complexity on Set-Top Box (STB). To tackle this problem, our scheme of supporting VCR functionalities with adaptive rate adjustment in streaming media server is proposed. The scheme includes a general VCR functionalities supporting method called GVFR which selects frames based on Group of Pictures (GOP) and uses Variable Frame Rate (VFR). Selecting frames based on GOP can efficiently eliminate the transmission of dependent frames, and the realization of VFR leads to optional transmission rate. Then an intelligent decision mode is introduced which automatically picks the appropriate GVFR strategies with suitable transmission rate based on the congestion status of the link. The experimental results demonstrate that GVFR can greatly decrease the transmission rate of fast forward/backward, to 22% of that of normal playback at least, and by varying GVFR strategies, VCR with optional transmission rate is achieved.

关键词： Video recording Streaming media Decoding network servers Bandwidth Videoconference Video on demand Computer networks US Department of Transportation Information technology

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A Design of Decision Engine for 5G Auto-driving Based on Ontology Slice 5

A Design of Decision Engine for 5G Auto-driving Based on Ont...

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5th IEEE International Conference on Computer and communications, ICCC 2019

作者： Zhang, Chenyu Wen, Xiangming Zheng, Wei Lu, Zhaoming Wang, Luhan Beijing Laboratory of Advanced Information Networks China Beijing Key Lab of Network System Architecture and Convergence China School of Information and Communication Engineering Beijing Univ. of Posts and Telecom Beijing100876 China

ISBN: (纸本)9781728147437

With the access to 5G network, auto-driving vehicles can upload their sensors' information to Mobile Edge Computing (MEC) and get driving decision results relaying on the powerful computing ability of MEC. This article presents an architecture of intelligent decision engine running on MEC for 5G auto-driving (IDEA) by adopting the concept of ontology slice. IDEA constructs an ontoligy slice for every vehicle including sensor information, vehicle status, rule bases, etc. and provides logical isolated resources to prevent interference between ontologies. This paper gives out the method of implementing and managing of the ontology slices and method of scheduling reasoner. Besides, to make better and safer decisions, this paper also proposes an algorithm, combining an analytic strategy algorithm (WADD) and a heuristic strategy algorithm (TTB), considering both vehicle's velocity and sensors' refresh rate, to deal with incomplete information before making decesions. With simulation, it is shown that IDEA can provide efficient and reliable auto-driving decision service with low processing time. © 2019 IEEE.

关键词： Ontology

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A Tabu Search Approach for Optimizing Server Placement in Distributed systems

A Tabu Search Approach for Optimizing Server Placement in Di...

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International Conference on networking and Distributed Computing (ICNDC)

作者： Biyao Wang JinLin Wang Xue Liu National Network New Media Engineering Research Center Institute of Acoustics Chinese Academy of Sciences (CAS) Beijing China Key Laboratory of Network Communication System and Control Key Laboratory of Anhui Network Communication System and Control University of Science and Technology of China Hefei China

In distributed systems, the server placement problem in which a new server has to compete with existing servers for user requests is important in planning of constructing new business service sites. In addition to minimizing cost, competition-aware server placement also needs to maximize the benefit of building a new server. This paper proposes a Tabu Search approach to optimize the problem in general graphs. Results from the simulation experiments show that it do has a better performance than both of the Greedy Add and Greedy Remove algorithms.

关键词： Servers Search problems Buildings Business Planning Algorithm design and analysis Routing

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Design and implementation for the industrial wireless gateway of smart tunneling

Design and implementation for the industrial wireless gatewa...

引用

International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2010

作者： Wang, Quan Chen, Xuhui Wang, Ping Liu, Chao Ministry of Education Key Lab of Network Control and Intelligent Instrument Chongqing University of Posts and Telecommunications Chongqing 400065 China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

ISBN: (纸本)9780769539621

By means of comprehensive analysis of the traits and demands of industrial wireless networks, interconnection issues between WIA-PA wireless industry network wireless networks and Ethernet for Plant Automation (EPA) are researched and concluded. Aim to solve those issues, the system model and architecture of the smart tunneling gateway is proposed in this paper. Furthermore, design and implementation of this smart tunneling gateway is introduced in detail. Finally, experiment testing results show that the proposed industrial wireless gateway of smart tunneling can efficiently improve the data transmission performance and extend the life of wireless field devices. © 2010 IEEE.

关键词： Wireless networks

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