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

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

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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

引用

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...

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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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A Novel Load Balancing Algorithm in IEEE 802.11 Wireless LANs with Cell Breathing

A Novel Load Balancing Algorithm in IEEE 802.11 Wireless LAN...

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

作者： Yun Li Hong Ji Xi Li Daojin Cai Key Lab. of Universal Wireless Commun. Beijing Univ. of Posts & Telecommun. Beijing China

Many mechanisms have been studied aimed at resolving load imbalance among access points (APs), which is a key issue in Wireless LANs (WLANs); meanwhile, cell breathing (CB), first appearing in cellular networks, provides another method in controlling coverage scale to realize load balance. In this paper, we present a new load balancing algorithm through power management based on cell breathing. Through establishing a centralized operation agent (COA), the load status of all the APs is monitored and power management is implemented accordingly, thus it avoids repetitive operations and extra management message consumption between APs in the distributive manner. Simulation results show that our algorithm can find a near optimal solution and improve the fairness as well as the performance of the whole network effectively.

关键词： Load management Wireless LAN Energy management Land mobile radio cellular systems Size control Wireless communication Telecommunication control Monitoring Power control Centralized control

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A Study of Transmission control Protocol for Satellite Network

A Study of Transmission Control Protocol for Satellite Netwo...

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

作者： Liang Yu Ji-liu Zhou School of Electronics and Information Engineering Sichuan University Chengdu P. R. China

According to technical statistics, current TCP protocols with approximately 80% Internet applications run on perform very well on wired networks. However, due to the effects of long propagation delay, great bandwidth asymmetry, high sporadic bit error rate (BER) and etc., TCP performance degrades obviously on the satellite communication networks. To avoid the problems, TP-S, a novel transport control protocol, is introduced for satellite IP networks. Firstly, in order to increase the increment speed of Congestion Window (cwnd) at the beginning of data transmission, the traditional slow start strategy is replaced by a new strategy, known as super start. Secondly, a new packet lost discriminated scheme based on IP packets alternately sending with different priority is used in the protocol to decouple congestion decision from errors. Thirdly, bandwidth asymmetry problem is avoided by adopting modified NACK (M-NACK) in receiving ends, which is sent periodically. In addition, the sending strategy in routers is also modified along with other's changes to support the protocol. Finally, the simulation experiments show that the new protocol can not only significantly enhance throughput performance, but also reduce sharply bandwidth used in the reverse path as compared with traditional TCP protocols and those protocols, which are recently proposed for satellite IP networks.

关键词： Protocols IP networks Bandwidth Bit error rate TCPIP Statistics Propagation delay Degradation Satellite communication communication system control

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Minimize the Effect of IGMP Leave Latency in Layered Multicast

Minimize the Effect of IGMP Leave Latency in Layered Multica...

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

作者： Karan Singh Rama Shankar Yadav Girish Kumar Gupta Department of Computer Science & Engineering Motilal Nehru National Institute of Technology Allahabad Uttar Pradesh India

Many receivers driven cumulative layered multicast congestion control protocol such as RLM, RLC and FLID-DL used for multimedia application. However, these protocols are suffering with problem of congestion during IGMP leave latency leading to switching between overloading and under loading network state which can't utilize bandwidth so that quality of service gets degraded. To overcome of these problems, we propose an adaptive algorithm that judicially utilizing the concept of deaf period and dynamic layer which is based on a threshold value of Leave latency. Our propose algorithm perform better in term of QoS and proper bandwidth utilization by effective congestion control during leave latency period.

关键词： Delay Multicast protocols Deafness Bandwidth Streaming media communication system traffic control Traffic control Telecommunication control Quality of service Digital multimedia broadcasting

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