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Efficient Admission control Scheme to Support QoS in WLANs

Efficient Admission Control Scheme to Support QoS in WLANs

引用

international conference on Wireless communications, networking and Mobile computing (WiCom)

作者： Shi Yan Songgen Jin Zhiguo Chen Educ. Technol. & Network Inf. Center Mudanjiang Med. Univ. Mudanjiang China Technol. Sect. of Libr. Mudanjiang Med. Univ. Mudanjiang China

In order to support quality of service (QoS) for realtime traffic in wireless local area networks (WLANs), an efficient admission control scheme called EACS is proposed. According to the QoS requests of existing connections in access point's polling table, EACS decides the maximum contention resolution time which can meet the existing requirements. Then, EACS determines the maximum number of stations that system can support by searching resource management algorithm, which records the relation between the system load and contention resolution time. Finally, these stations with the contending permission employ the efficient contention control mechanism to contend the channel. Simulation results proved the proposed EACS makes the stations achieve lower transmission delay and better channel utilization.

关键词： Admission control Quality of service Wireless LAN communication system traffic control Resource management Delay Personal digital assistants Permission Portable computers Telecommunication traffic

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A High-Linearity, 60-dB Variable Gain Amplicier with Dual DC-Offset Cancellation for UWB Systems

A High-Linearity, 60-dB Variable Gain Amplicier with Dual DC...

引用

international conference on Wireless communications, networking and Mobile computing (WiCom)

作者： J. Cheng F. Y. Huang L. H. Wu Y. Tian N. Jiang RF&OEIC Research Institute South-East University Nanjing China S-TEK Research Center Shanghai China

A fully differential variable gain amplifier (VGA) for ultra-wideband (UWB) systems has been designed in a standard 0.18 mum CMOS process. The VGA is implemented using three variable gain stages followed by a fixed gain amplifier stage with a dual feedback DC-offset cancellation network to correct DC-offset. The proposed VGA shows a high linear gain range of 60 dB (0.7 dB-60.7 dB) at 650 MHz, drawing 8.9 mA with a 1.8 V power supply. The VGA chip occupies only 0.23 mm 2 (0.47 mmtimes0.47 mm) active area.

关键词： Gain Voltage Bandwidth Feedback circuits Differential amplifiers Hemorrhaging Computer architecture Negative feedback Wireless communication communication system control

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The Impact of Simulation Area Shape on the Performance of Ad Hoc Networks

The Impact of Simulation Area Shape on the Performance of Ad...

引用

international conference on Wireless communications, networking and Mobile computing (WiCom)

作者： Heng Luo David Laurenson Aihuang Guo Hui Li Institute of Digital Communication University of Edinburgh UK College of Electronics and Information Engineering University of Tongji China

The shape of the simulation area is critical in simulations because average hops of source to destination will change in different shapes. We measure one reliability metric (connectivity) and five efficiency metrics (round trip time, drop rate, energy cost, routing overhead and throughput goodput) in various shapes of simulation areas. Three routing protocols (DSDV, AODV and DSR) are carefully studied in different mobility patterns as well as speeds. Results show that DSDV performs the worst in most cases except in the case of round trip time. We prove that network efficiency metrics enhance when the reliability metric decreases. One exception is that the throughput descends when the horizon length increases. The key reason, we believe, is that the influence of network partitioning out-ranks the impact of network transmission condition improvement.

关键词： Ad hoc networks Routing protocols Shape measurement Throughput Telecommunication traffic Traffic control Gaussian processes Digital communication Area measurement Energy measurement

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DFMAC: DTN-friendly medium access control for wireless local area networks

DFMAC: DTN-friendly medium access control for wireless local...

引用

international conference on communications and networking in China (CHINACOM)

作者： Hao Liang Weihua Zhuang Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

In this paper, we consider a wireless communication network for both low-speed mobile nodes in densely populated hotspots and high-speed mobile nodes roaming in a large area. Wireless local area networks (WLANs) are deployed in the hotspots, while a delay/disruption tolerant network (DTN) provides services to roaming nodes in the large area with low node density. We investigate radio resource allocation for a DTN/WLAN integrated network, and propose a DTN-friendly medium access control (DFMAC) scheme for the hotspots. Analytical models are established to characterize the interactions between a DTN and WLANs under the proposed DFMAC. Numerical and simulation results demonstrate that our proposed MAC scheme can provide an effective and efficient way to balance the radio resource allocation between a DTN and WLANs.

关键词： Media Access Protocol Wireless LAN Disruption tolerant networking Resource management Mobile computing Roaming Routing Wireless communication Analytical models Numerical simulation

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Design and Implementation of Integer Transform and Quantization Processor for H.264 Encoder on FPGA

Design and Implementation of Integer Transform and Quantizat...

引用

international conference on advances in computing, control, & Telecommunication Technologies (ACT)

作者： N. Keshaveni S. Ramachandran K.S. Gurumurthy Electronics and Communication MGR University Chennai India National Academy of Excellence Bangalore India Electronics and communication UVCE Bangalore India

This paper proposes a novel implementation of the core processors, the integer transform and quantization for H.264 video encoder using an FPGA. It is capable of processing the picture frames with the desired compression controlled by the user input. The algorithm and architecture of the components of the video encoder namely, integer transformation, quantization were developed, designed and coded in Verilog. The complete H.264 video encoder was coded in Matlab in order to verify the results of the Verilog implementation. The processor is implemented on a Xilinx Vertex -II Pro XC2VP30 FPGA. The gate count of the implementation is approximately 1,057,000 working at a frequency of 208 MHz. It can process 1024×768 pixel color images in 4:2:0 format at 25 frames per second. The reconstructed picture quality is better than 35 dB.

关键词： Quantization Field programmable gate arrays Video compression Hardware design languages communication system control Parallel algorithms Transforms Application specific integrated circuits Quadratic programming Streaming media

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Load Balancing in Multi ECU Configuration

Load Balancing in Multi ECU Configuration

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international conference on advances in Recent Technologies in communication and computing, ARTCom

作者： Rajeshwari Hegde K.S. Gurumurthy Department of Telecommunication Engineering BMS College of Engineering Bangalore India Department of E & C UVCE Bangalore India

ISBN: (纸本)9781424451043

Electronic control units (ECUs) are widely used to improve the comfort and reliability of vehicles. It has become the fundamental building block of any automotive subsystem and is interfaced with electro mechanics counterpart. To meet the system wide requirements, these ECUs are interconnected using the communication infrastructure. Although the communication infrastructure in terms of, predominantly, the CAN based vehicle network took its birth to enable ECUs to work in a coordinated manner in order to support system wide requirements, during the past decade, this infrastructure was also viewed as a potential means to incorporate extensibility in terms of addition of newer ECUs which are built for implementing additional requirements. With this paradigm, the number of ECUs started growing in a steep manner, uncontrolled and as a result, today, it is not hard to see a high segment automotive housing ECUs as large as 75-80. Hence, load balancing mechanisms are needed to ease ECU integration and for efficient utilization of CPU power in ECUs. In this paper, we explain the mathematical approach for load balancing across ECUs on the basis of CPU utilization.

关键词： Load management Automotive engineering Vehicle safety Reliability engineering Cost function Wiring Technological innovation Standardization control systems communications technology

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Performance Analysis of a New Delay Enabled EDCF for Voice Transport over IEEE802.11e

Performance Analysis of a New Delay Enabled EDCF for Voice T...

引用

IEEE international conference on Wireless and Mobile computing, networking And communications (WiMob)

作者： Nasser-Eddine Rikli Mohamed A. Al-Rashed Department of Computer Engineering King Saud University Saudi Arabia

In this paper, a new delay-enabled EDCF for the transport of real-time traffic over an IEEE802.11e wireless LAN is proposed. The proposed technique will drop any packet belonging to a conversational class when a maximum queueing delay is reached. The packets belonging to an interactive or a background class are not dropped due to the queuing delay. The performance of this new technique is evaluated and compared to the the standard EDCF when serving various traffic classes. The effects of the backoff parameters and the traffic composition on the transmission probability, the dropping probability, the medium access delay, and the throughput is investigated. It is believed that such study is imperative for the design of a mapping function between an inherently QoS capable network such as UMTS, and an IEEE802.11 LAN.

关键词： Performance analysis Traffic control Wireless networks Wireless LAN Telecommunication traffic Throughput Delay effects 3G mobile communication Counting circuits Mobile computing

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Scenario Analysis and System Dynamics in New Emerging Technology Research: Case Mobile Peer-to-Peer Content Distribution

Scenario Analysis and System Dynamics in New Emerging Techno...

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international conference on advances in P2P Systems (AP2PS)

作者： Juuso Karikoski Mikko Heikkinen Heikki Hämmäinen Department of Communications and Networking Helsinki University of Technology Espoo Finland

This paper studies the use of scenario analysis and system dynamics in researching mobile peer-to-peer content distribution as a new emerging technology. Scenario analysis bounds the uncertainty related to the alternative futures of the technology by defining different scenarios. System dynamics is used to build a quantitative model based on the scenarios. During the research process four learning scenarios and a quantitative model depicting a dynamic mobile peer-to-peer file sharing ecosystem are constructed. As a result we conclude that the usage of scenario analysis is favorable in researching mobile peer-to-peer content distribution as a new emerging technology while the applicability of system dynamics can be questioned.

关键词： Peer to peer computing Mobile communication Uncertainty Telephone sets Portable computers Mobile ad hoc networks Ecosystems Distributed computing Cellular networks IP networks

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Research on Node Sleep/Wake-up Mechanism in WSN Based on Energy Threshold Setting

Research on Node Sleep/Wake-up Mechanism in WSN Based on Ene...

引用

international conference on Wireless communications, networking and Mobile computing (WiCom)

作者： Hongsheng Li Sumin Liu Bing Hu

Scheduling the nodes of wireless sensor network properly can effectively reduce the networks' energy consumption. The ordinary coverage algorithm is simply to identify redundant network nodes and let them go to sleep, without considering problem of power consumption of those continuing working nodes. This paper purpose a sleeping and wakening-up mechanism based on energy threshold setting, which can improve the nodes working efficiency by limit their energy consumption, balancing energy consumption of nodes, thus enhances the entire wireless sensor networks' life. The simulation results show that the sleep/wake-up mechanism based on energy threshold setting can be applied to wireless sensor networks very well with obvious energy-saving.

关键词： Sleep Wireless sensor networks Energy consumption Automation Computerized monitoring Protocols communication system control Change detection algorithms Computer networks Physics computing

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QoS Enhancements and Performance Analysis for Delay Sensitive Applications

QoS Enhancements and Performance Analysis for Delay Sensitiv...

引用

international conference on Advanced Information networking and Applications (AINA)

作者： J. Wang L. Guan X.G. Wang A. Grigg I. Awan I. Phillips X. Chi Department of Electronic and Electrical Engineering Loughborough University UK Department of Computer Science Loughborough University UK School of Computing Communication and Electronics University of Plymouth Plymouth UK Systems Engineering Innovation Centre (SEIC) Loughborough University UK Department of Computing University of Bradford Bradford UK Department of Communication Engineering Jilin University Changchun China

ISBN: (纸本)9781424440009

This paper presents a comprehensive system modeling and analysis approach for both predicting and controlling queuing delay at an expected value under multi-class traffic in a single buffer. This approach could effectively enhance QoS delivery for delay sensitive applications. Six major contributions are given in the paper: (1) a discrete-time analytical model is developed for capturing multi-class traffic with binomial distribution; (2) a control strategy with dynamic queue thresholds is used in simulation experiments to control the delay at a specified value within the buffer; (3) the feasibility of the system is validated by comparing theoretical analysis with simulation scenarios; (4) the arrival rate can be adjusted for each forthcoming time window during the simulation with multi-packet sources; (5) statistical evaluation is performed to show both efficiency and accuracy of the analytical and simulation results; (6) a graphical user interface is developed that can provide flexible configuration for the simulation and validate input values.

关键词： Performance analysis Modeling Analytical models Quality of service Propagation delay Traffic control Delay effects Application software Computer networks communication system traffic control

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