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检索条件"主题词=User Datagram Protocol/Internet Protocol"

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A New Mobile Spatial Information Service Grid Computing Model Based on Mobile Agent

A New Mobile Spatial Information Service Grid Computing Mode...

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WRI International Conference on Communications and Mobile Computing

作者： Tian Gen Li jin-fang Henan Polytech Univ Dept Geoinformat Jiaozuo 454003 Henan Peoples R China Guangdong Univ Technol Fac Electro Mech Engn Guangzhou 510090 Guangdong Peoples R China

ISBN: (纸本)9780769535012

A new mobile computing model of spatial information service is studied based on grid computing environment. Key technologies are presented in the model, including mobile agent (MA) mobile computing, grid computing, location based service (LBS) global positioning system (GPS), and wireless communication technologies, such as, general packet radio service (GPRS), transfer control protocol/internet protocol (TCP/IP), and user datagram protocol (UDP). In order to deal with the narrow bandwidth and instability of the wireless internet, distributed of organization of tremendous spatial data, limited processing speed and low memory of mobile devices, a new mobile agent based computing model of mobile spatial information service grid (MSISG) is further proposed that has good load balance, high processing efficiency, less network communication and thus suitable for mobile computing environment. A field test is carried out through this model, and the results show that the Proposed model is adaptable for mobile spatial information service.

关键词： Information Services Mobile agents wireless internet Grid computing Computational modeling Packet radio networks narrow bandwidth Load balancing user datagram protocol/internet protocol Mobile Computing PROCESSING SPEED field experimentation Wireless Communication Technique Mobile

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Comparative Performance Analysis of High-speed Transfer protocols for Big Data

Comparative Performance Analysis of High-speed Transfer Prot...

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38th Annual IEEE Conference on Local Computer Networks (LCN)

作者： Yu, Se-young Brownlee, Nevil Mahanti, Aniket Univ Auckland Dept Comp Sci Auckland 1 New Zealand

ISBN: (纸本)9781479905379

Researchers working in diverse fields such as astronomy, experimental physics, genomics, and meteorology have to frequently deal with analyzing voluminous amounts of complex data. Such data is often referred to as big data. These researchers work in teams and have to transfer this data over long distances. Efficiently transferring big data over long distances requires the use of appropriate transfer protocols. Several TCP-based and UDP-based protocols have been proposed in the literature, however, a comparative analysis of such protocols is lacking in the literature. This paper presents a comparative performance analysis of four well-known high-speed data transfer protocols for long fat networks, namely, GridFTP, FDT, UDT, and Tsunami. We performed extensive experiments to measure the effectiveness of each protocol in terms of its throughput for various round-trip times, and against increasing levels of congestion inducing TCP or UDP background traffic on a 10 Gb/s network. Our results show that without much tuning, TCP based protocols are able to achieve throughputs of more than 2 Gb/s. In presence of background traffic, UDP protocols perform better.

关键词： big data transfer protocol protocols Task Performance and Analysis system performance analysis Suppliers files Throughput Remote high speed data tsunamis Meteorology user datagram protocol/internet protocol Uridine Diphosphate

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Field Evaluation on Mobile WiMAX Network and Network Services in Azumino City

Field Evaluation on Mobile WiMAX Network and Network Service...

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IEEE Region 10 Conference (TENCON) - Sustainable Development through Humanitarian Technology

作者： Ota, Kenko Matsue, Hideaki Miyazawa, Satoru Nanamatsu, Satoshi Hirata, Yukihiro Hasui, Akio Yamazaki, Masahiro Namera, Takakazu Fukui, Hiroshi Harvey, Matthew Miyajima, Hajime Yazawa, Yoshiaki Miyasaka, Kohei Kainuma, Yoshihiro Tokyo Univ Sci Dept Elect Syst Engn 5000-1 Toyohira Chino Nagano 3910292 Japan Azumino City Nagano 3998101 Japan Commuture Corp SIA Toyosu Primesquare 9th F Koto Ku Tokyo 1358113 Japan Azumino Networks Community TV Nagano 3998303 Japan

ISBN: (纸本)9781467348232;9781467348225

This paper describes field evaluation results on a mobile WiMAX network and network services in Azumino city. An experimental mobile WiMAX network has been deployed in Azumino city so as to improve the sophistication of public services. Overview of the deployed network and field experimental results on both throughput in UDP (user datagram protocol) layer and received power are denoted in this paper. Following network services have been realized so as to provide safety and relief to local community on the deployed network: high speed internet access service, VoIP (Voice over IP) telephonic service, live camera system, life recording and management system and digital community wireless system for disaster prevention and safety confirmation. This paper shows field evaluation results on above-mentioned services and discusses the feasibility of providing safety and relief.

关键词： field evaluation WiMax relief Legal Services mobile networking High speed access Network city user datagram protocol/internet protocol disaster prevention received power Mobile Voice over internet protocol safety

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internet delays and packet losses sensor/actuator for UDP based Networked Control Systems

Internet delays and packet losses sensor/actuator for UDP ba...

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Mediterranean Conference on Control & Automation

作者： Miguel Diaz-Cacho Emma Delgado Antonio Barreiro School of Computer Engineering University of Vigo School of Industrial Engineering University of Vigo

ISBN: (纸本)9781479909964

The performance of networked control systems (NCS) in non-deterministic networks, such as the internet depends largely on the network delays and packet losses. The reproduction of these delays and packet losses in a NCS implies the use of network simulators and emulators. In this paper, a system that performs as a sensor and as an actuator of internet delays and packet losses is presented. It collects these parameters from the internet and reproduces them into a local network data flow. The paper presents some comparative results and makes a performance analysis of the whole system.

关键词： Packet loss Networked control systems internets network delay user datagram protocol/internet protocol Uridine Diphosphate Emulators control systems delay network simulator actuators

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Performance of TCP and UDP over Narrowband internet of Things (NB-IoT)

Performance of TCP and UDP over Narrowband Internet of Thing...

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IEEE International Conference on internet of Things and Intelligence System (IOTAIS)

作者： Joschka Wirges Uwe Dettmar Faculty of Information Media and Electrical Engineering TH Köln Cologne Germany

ISBN: (纸本)9781728125176

NB-IoT extends LTE by low power WAN functionality for IoT applications. Strengths of the standard lie in the already existing infrastructure, an ubiquitous availability, and the low power consumption and costs. NB-IoT supports both TCP and UDP as transport protocols. However, TCP is sensitive to delays and packet losses during data transmission. This affects the commonly used messaging protocol MQTT, as it uses TCP as its underlying transport protocol. In this paper the role of UDP as a possible transport layer protocol for NB-IoT in conjunction with MQTT-SN is discussed and compared to TCP with standard MQTT. Using TCP for a typical NB-IoT application resulted in a packet loss of about 90%, whereas UDP achieved a packet loss of only around 3%. Additionally, the current state of NB-IoT installations in Germany and their functionality are evaluated. Coverage, signal quality and power saving functionality are monitored and analyzed as well.

关键词： internet of Things queueing theory telemetry transport protocols wide area networks transport protocols Tritolyl Phosphates tactical command post user datagram protocol/internet protocol Uridine Diphosphate Wide area networks internet of things queueing theory Packet loss telemetry transport layer protocol

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A comparative study of mixed traffic scenarios for different scheduling algorithms in WiMAX

A comparative study of mixed traffic scenarios for different...

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IEEE Vehicular Technology Conference

作者： Milad Alizadeh Rudzidatul Akmam Dziyauddin Dritan Kaleshi Angela Doufexi Centre of Communication Research Department of Electronics and Electrical Engineering University of Bristol UK

ISBN: (纸本)9781467309899

WiMAX promises an advanced framework to support Quality-of-Service (QoS) requirements of different types of applications and scheduling is a key part in its QoS provisioning. The scheduling algorithms used in this paper are based on our proposed Greedy-Latency scheduler, a modified form of Greedy algorithm which can guarantee delay requirements of real-time applications while optimising the system throughput. Our study of TCP performance in WiMAX shows that unlike UDP traffic, there are fluctuations in TCP throughput even for low traffic loads. It is seen that employing Automatic Repeat reQuest (ARQ) and setting the right TCP window size are crucial for a stable optimal TCP performance. WiMAX QoS mechanism can successfully maintain the inter-class priority between TCP traffic in Best Effort (BE) class and UDP in higher priority Real- Time Polling Service (rtPS) class. For intra-class scenarios, it is observed that TCP flows in general need a protection mechanism as the UDP traffic tend to seize the channel. The proposed Greedy-Scheduler can provide better intra-class protection for TCP flows due to its packet dropping policy.

关键词： IEEE 802.16 WiMAX QoS Scheduling TCP Greedy Packet Dropping WiMax Tritolyl Phosphates tactical command post Scheduling algorithms user datagram protocol/internet protocol Uridine Diphosphate protection mechanism Quality of service low traffic Mixed traffic greedy algorithm Window Size Automatic repeat request

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Software-Defined Mobility in IP based Wi-Fi Networks: Design Proposal and Future Directions

Software-Defined Mobility in IP based Wi-Fi Networks: Design...

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IEEE International Conference on Advanced Networks and Telecommuncations Systems

作者： Krishna Vijay Kumar Singh Mayank Pandey Department of Computer Science & Engineering Motilal Nehru National Institute of Technology Allahabad

ISBN: (纸本)9781509021949

Current networking devices are limited in their capabilities to dynamically adjust their behaviour with respect to the location changes induced by the mobility of communicating partners. This adversely affects the performance of applications running on top of IP-based wireless networks. Software Defined Networks (SDN) provide the strength of network programability which facilitates on-demand customization of underlying network according to the application context. In this paper, we propose our methodology for seamless mobility in IP-based Wi-Fi networks using SDN. Our solution works for both layer-2 and layer-3 mobility scenarios and is able to cater the needs of Wi-Fi networks. We have evaluated our approach with respect to handover delay, route establishment delay, data loss and throughput both for UDP and TCP traffic. Emulation results obtained establish the applicability of our approach.

关键词： Software Defined Networks OpenFlow IP mobility Wi-Fi Network design EIS IMPLEMENTATION PLANS mobility user datagram protocol/internet protocol Uridine Diphosphate COMMUNICATING Network

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Performance Evaluation of Wireless Mesh Networks using IEEE 802.11s and IEEE 802.11n

Performance Evaluation of Wireless Mesh Networks using IEEE ...

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IEEE International Conference on Communications

作者： Tom Imboden Kemal Akkaya Zach Moore School of Inf. Sys. & App. Tech. Southern Illinois University Department of Computer Science Southern Illinois University School of Info. Sys. & App. Tech. Southern Illinois University

ISBN: (纸本)9781457720529

With the recent approval of IEEE 802.11n standard and progress on IEEE 802.11s mesh standardization efforts, performance evaluation of such standards has gained acceleration. In particular, several wireless testbeds have been created to form wireless mesh networks (WMNs) in order to test various aspects of these new standards. However, none of these considered multi-hop performance of WMNs when 802.11n based nodes are employed. While IEEE 802.11s is geared for implementing multi-hopping capability among the nodes, current studies still assume IEEE 802.11a/g based nodes. This paper presents a performance evaluation of WMNs using both 802.11s (in conjunction with 802.11a/g) and 802.11n on a real academic testbed. While a draft version of 802.11s has been used for creating a linear WMN using 802.11a/g based routers, the same linear WMN using 802.11n has been created using virtualized interfaces at the IP layer. Using such WMNs, throughput performance of TCP and UDP at both the 2.4 GHz and 5 GHz spectrums with different number of hops has been examined. The experiment results have shown that multi-hopping significantly degrades the expected performance of IEEE 802.11n.

关键词： Performance Evaluation INSTITUTE OF ELECTRICAL AND ELECTRONIC ENGINEERS Spread spectrum communication Wireless mesh networks user datagram protocol/internet protocol Uridine Diphosphate Humulus

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Design of embedded voice communication system

Design of embedded voice communication system

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IET International Conference on Smart and Sustainable City 2013 (ICSSC 2013)

作者： Xuzhi Wang Wenzhen Zhang Xiangfei Li Shanghai University Shanghai Shanghai CN

ISBN: (纸本)9781629938219

Voice communication is the most basic and important means to people directly exchange. Meanwhile, with the development of embedded systems, where the mobile phones, televisions, set-top boxes and other home electronics and communication products and even electric transport control core are all closely related to embedded systems. This paper describes the design and implementation of a multi-way voice communication system with the internet protocol of UDP, using S3C2440A as the control core and other Peripheral Circuits realize the voice processing and transition functions. Experiments show that the system not only can meet the fast processing, but also meet the requirements of small and portable.

关键词： Embedded System PCM Coded UDP protocol Voice Communication Embedded systems voice communication system Voice communication Speech processing internet protocol user datagram protocol/internet protocol Uridine Diphosphate

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Delay Bound Analysis Using Martingale for Multimedia DTN under Heterogeneous Network for High-Speed Trains

Delay Bound Analysis Using Martingale for Multimedia DTN und...

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IEEE Global Communications Conference

作者： Yun Hu Hongyan Li Zhu Han State Key Laboratory of Integrated Service Networks Xidian University Electrical and Computer Engineering Department University of Houston Houston

ISBN: (纸本)9781479959532

Recently, high-speed train is rapidly developed as a popular public transportation. How to provide passengers's broadband mobile communication services efficiently, such as voice over IP (VoIP) or other multimedia services, is receiving more and more attention. To fulfill the passenger's demand, we consider a heterogeneous network (HetNet) structure consisting track-side access points (TAPs) and cellular networks for the high-speed rail communication system (HRCS). End-to-end delay is one of the most important quality of service (QoS) indicators to evaluate the HetNet performance. Therefore, this paper investigates the joint end-to-end delay of VoIP and multimedia services in this HetNet architecture. Intermittent connectivity of TAPs and scheduling of multiple on-demand services are considered. In order to obtain the theoretic value of queueing delay bounds, we utilize the martingale theory by analyzing the Markov arrival processes. By combing the arrival-martingale and service-martingale concepts, the theoretic delay bounds under the first in first out (FIFO) scheduling scenario are obtained. For the simulation, we use three kinds of real wireless data traces, VoIP, gaming and UDP to evaluate our algorithm by using Nakagami fading channel and LTE fading channel. From the results we can see that the martingale end-to-end delay bounds are tight to the real data trace simulation results.

关键词： Heterogeneous networks Voice over internet protocol Multimedia services wireless data high-speed train first-in first-out theoretical value demand service End-to-end delay Bound queueing delay martingales Fading channels DTNA gene user datagram protocol/internet protocol

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