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Author: Kanthakumar Mylsamy Pongaliur
Publisher:
ISBN:
Category : Computer network protocols
Languages : en
Pages : 158
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Book Description
Author: Kanthakumar Mylsamy Pongaliur
Publisher:
ISBN:
Category : Computer network protocols
Languages : en
Pages : 158
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Book Description
Author: Xuanming Dong
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
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Book Description
High speed data wireless networks in multipath environments suffer channel impairment from many sources such as thermal noise, path loss, shadowing, and fading. In particular, short-term fading caused by mobility imposes irreducible error floor bounds on system performance. We study the effect of fading on the performance of the widely used TCP/UDP protocol, and investigate how to improve TCP performance over fading channels. Our solutions target upcoming mobile wireless systems such as IEEE 802.16e wireless MANs "Metropolitan Area Networks" where adaptive modulation is enabled and the underlying medium access scheme is On-Demand Time Division Multiple Access "On-Demand TDMA". Adaptive modulation is used in the new generation of wireless systems to increase the system throughput and significantly improve spectral effciency by matching parameters of the physical layer to the time-varying fading channels. Most high-rate applications for such wireless systems rely on the reliable service provided by TCP protocol. The effect of adaptive modulation on TCP throughput is investigated. A semi-Markov chain model for TCP congestion/flow control behavior and a multi-state Markov chain model for Rayleigh fading channels are used together to derive the steady state throughput of TCP Tahoe and Reno. The theoretical prediction based on our analysis is consistent with simulation results using the network simulator NS2. The analytical and simulation results triggered the idea of cross-layer TCP protocol design for single-user scenarios. The fading parameters of wireless channels detected in the physical layer can be used to dynamically tune the parameters "such as packet length and advertised receiver window size" of the TCP protocol in the transport layer so that TCP throughput is improved. For multi-user scenarios, we study how multi-user diversity can be used to improve th.
Author: Xingang Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
It is well known that TCP performs poorly in wireless mesh networks. There has been intensive research in this area, but most work uses simulation as the only evaluation method; however, it is not clear whether the performance gains seen with simulation will translate into benefits on real networks. To explore this issue, we have implemented ATP (Ad-hoc Transport Protocol), a transport protocol designed specifically for wireless ad hoc networks. We have chosen ATP because it uses a radically different design from TCP and because reported results claim significant improvement over TCP. We show how ATP must be modified in order to be implemented in existing open-source wireless drivers, and we perform a comprehensive performance evaluation on mesh testbeds under different operating conditions. Our results show that the performance of ATP is highly sensitive to protocol parameters, especially the epoch timeout value. To improve its performance we design an adaptive version that utilizes a self-adjustable feedback mechanism instead of a fixed parameter. A comprehensive measurement study demonstrates the advantages of our adaptive ATP under various operating conditions. For networks with high bit-rate, low quality links, our adaptive version of ATP demonstrates an average of more than 50% gain in goodput over the default ATP for a single flow case. With respect to fairness, the adaptive ATP generally outperforms the default ATP by an order of magnitude in most results.
Author: Jia-Chin Lin
Publisher: BoD – Books on Demand
ISBN: 9533072741
Category : Computers
Languages : en
Pages : 470
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Book Description
This book focuses on the current hottest issues from the lowest layers to the upper layers of wireless communication networks and provides "real-time" research progress on these issues. The authors have made every effort to systematically organize the information on these topics to make it easily accessible to readers of any level. This book also maintains the balance between current research results and their theoretical support. In this book, a variety of novel techniques in wireless communications and networks are investigated. The authors attempt to present these topics in detail. Insightful and reader-friendly descriptions are presented to nourish readers of any level, from practicing and knowledgeable communication engineers to beginning or professional researchers. All interested readers can easily find noteworthy materials in much greater detail than in previous publications and in the references cited in these chapters.
Author:
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ISBN:
Category :
Languages : en
Pages : 5
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Book Description
Results are reported on research in adaptive transmission for mobile wireless frequency-hop communication networks. Adaptive protocols were devised and performance results were obtained tor frequency-hop transmission with Reed-Solomon coding and frequency-hop transmission with turbo coding. A method for generating side information from interleaving was developed, and the performance of Hermitian codes was evaluated. Adaptive transmission protocols were integrated with adaptive routing protocols to provide energy efficiency in mobile, tactical, frequency-hop, wireless ad hoc networks.
Author:
Publisher:
ISBN:
Category : Data transmission systems
Languages : en
Pages : 724
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Author: Onyekachi Acholem
Publisher:
ISBN:
Category :
Languages : en
Pages : 122
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ABSTRACT: Furthermore, results from this research will show that tuning the carrier sense threshold and contention window offers several advantages including delivering considerable aggregate throughput more than that obtained from a static carrier sense threshold network with no previous knowledge of the network topology. This will enable nodes sustain a high data rate, while maintaining the adverse effect of collision on other neighboring simultaneous communications at minimum. In the end, the communication protocol will be improved to achieve better utilization of the scarce wireless spectrum. The simulation and performance evaluation tools required for this work would be Network Simulator-2 (NS-2) simulator, AWK and PERL programming languages.
Author: Ilsun You
Publisher: Springer Nature
ISBN: 9811695768
Category : Computers
Languages : en
Pages : 428
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Book Description
This book constitutes the refereed proceedings of the 5th International Symposium on Mobile Internet Security, MobiSec 2021, held in Jeju Island, Republic of Korea, in October 2021. The 28 revised full papers presented were carefully reviewed and selected from 66 submissions. The papers are organized in the topical sections: IoT and cyber security; blockchain security; digital forensic and malware analysis; 5G virtual Infrastructure, cryptography and network security.
Author: Nurajlal Pradhan
Publisher:
ISBN:
Category :
Languages : en
Pages : 224
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Book Description
Author: Arun Baburam
Publisher:
ISBN:
Category :
Languages : en
Pages : 404
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Book Description
