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IEEE Vehicular Technology Conference

作者： Johannes Pillmann Daniel Behnke Benjamin Sliwa Matthias Priebe Christian Wietfeld Communication Networks Institute (CNI) TU Dortmund University Otto-Hahn-Str. 6 Dortmund 44227 Germany

ISBN: (纸本)9781538663592;9781538663585

Nowadays, vehicles are not only merely used as a transportation medium, but also as a highly mobile Internet of Things (IoT) node, collecting data from all types of sources. The delivery of aggregated vehicle sensor data into the cloud for further analysis is very fragile, as vehicles move fast in their environment and channel conditions vary heavily. Next to mastering possible packet loss, communication protocols need to quickly adapt to the frequent data rate changes. Random Linear network coding (RLNC) has been proven as an efficient and robust mechanism for reliable data transfer especially on lossy channels. In this paper, the authors extend the Scalable network coding (ScalaNC) framework with the novel congestion control Bottleneck, Bandwidth and Round-Trip Time (BBR) in order to quickly adapt to the frequent changes in data rate and allow effective transfer of high amounts of data from vehicles and into the cloud. ScalaNC is validated in a Hardware-in-the-Loop field test consisting of a Long Term Evolution (LTE) base station and channel emulator.

关键词： channel coding cloud computing Long Term Evolution network coding telecommunication congestion control telecommunication network reliability vehicular ad hoc networks wireless channels wireless sensor networks Long Term Evolution network coding telecommunication congestion control telecommunication network reliability wireless channels Channel coding Cloud Computing Wireless sensor networks V2V vehicle

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Multicomponent Subspace Codes in network coding

Multicomponent Subspace Codes in Network Coding

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Engineering and Telecommunication (EnT-MIPT)

作者： E.M. Gabidulin N.I. Pilipchuk Dept. of Radio Engineering and Control System Moscow Institute of Physics and Technology (State University) Moscow Russia

ISBN: (纸本)9781728104331

This paper is devoted to multicomponent subspace codes with zero prefix (MZP) and their role in network coding. In fact, it is a collection of our results about multicomponent codes for last years. The MZP construction is described. The cardinality for different parameters is calculated. The efficiency as a ratio cardinality to the upper bound is estimated. It is shown that MZP additional components can increase cardinality up to 30 percents. The iterative decoding algorithm is presented. At the first stage of decoding it is necessary to obtain a MZP component and then, at the next stage to apply the decoding algorithm of Silva-Koetter-Kschischang (SKK) codes.

关键词： Upper bound network coding Measurement Iterative decoding Encoding Error correction codes Decoding

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IFIP networking Conference

作者： Jonnahtan Saltarin Torsten Braun Eirina Bourtsoulatze Nikolaos Thomos University of Bern Bern Switzerland Imperial College London London United Kingdom University of Essex Colchester United Kingdom

ISBN: (纸本)9781538662809;9783903176089

In this paper, we propose PopNetCod, a popularity-based caching policy for network coding enabled Named Data networking. PopNetCod is a distributed caching policy, in which each router measures the local popularity of the content objects by analyzing the requests that it receives. It then uses this information to decide which Data packets to cache or evict from its content store. Since network coding is used, partial caching of content objects is supported, which facilitates the management of the content store. The routers decide the Data packets that they cache or evict in an online manner when they receive requests for Data packets. This allows the most popular Data packets to be cached closer to the network edges. The evaluation of PopNetCod shows an improved cache-hit rate compared to the widely used Leave Copy Everywhere placement policy and the Least Recently Used eviction policy. The improved cache-hit rate helps the clients to achieve higher goodput, while it also reduces the load on the source servers.

关键词： network coding Computer architecture Internet Data models Streaming media Delays Diversity reception

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Hierarchical Layer Selection with Low Overhead in Prioritized network coding

Hierarchical Layer Selection with Low Overhead in Prioritize...

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IFIP networking Conference

作者： Marie Schaeffer Roman Naumann Stefan Dietzel Björn Scheuermann Humboldt-Universität zu Berlin Germany

ISBN: (纸本)9781538662809;9783903176089

network coding simplifies routing decisions, improves throughput, and increases tolerance against packet loss. A fundamental limitation, however, is delay: decoding requires as many independent linear combinations as data blocks. Prioritized network coding reduces this delay problem by introducing a hierarchy of prioritization layers. What remains is the problem of choosing a layer to approach two often-contradicting goals: reduce delay until prioritized layers can be decoded and keep the total number of transmissions low. In this paper, we propose an algorithm for this problem that - based on limited feedback - primarily minimizes per-layer delay but identifies opportunities to reduce the required transmissions when per-layer delay is unaffected. Our evaluation shows that our algorithm improves per-layer delay compared to hierarchical network coding and is close to the theoretical optimum number of total transmissions.

关键词： Delays Decoding network coding Encoding Receivers Protocols Throughput

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When Analog Meets Digital: Source-Encoded Physical-Layer network coding

When Analog Meets Digital: Source-Encoded Physical-Layer Net...

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IEEE International Symposium on World of Wireless Mobile and Multimedia networks (WoWMoM)

作者： Raphael Naves Gentian Jakllari Hicham Khalife Vania Conant Andre-Luc Beylot Thales Communications & Security-France

ISBN: (纸本)9781538647264

We revisit Physical-Layer network coding (PLNC) and the reasons preventing it from becoming a staple in wireless networks. We identify its strong coupling to the Two-Way Relay Channel (TWRC) as key among them due to its requiring crossing traffic flows and two-hop node coordination. We introduce SE-PLNC, a Source-Encoded PLNC scheme that is traffic pattern independent and involves coordination only among one-hop neighbors, making it significantly more practical to adopt PLNC in multi-hop wireless networks. To accomplish this, SE-PLNC introduces three innovations: it combines bit-level with physical-level network coding, it shifts most of the coding burden from the relay to the source of the PLNC scheme, and it leverages multi-path relaying opportunities available to a particular traffic flow. We evaluate SE-PLNC using theoretical analysis, proof-of-concept implementation on a Universal Software Radio Peripherals (USRP) testbed, and simulations. The theoretical analysis shows the scalability of SE-PLNC and its efficiency in large ad-hoc networks while the testbed experiments its real-life feasibility. Large-scale simulations show that TWRC PLNC barely boosts network throughput while SE-PLNC improves it by over 30%.

关键词： Topology Relays network coding network topology Throughput Wireless networks Spread spectrum communication

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Energy efficiency of network-coding enabled mobile small cells

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COMPUTER COMMUNICATIONS 2018年 121卷 50-58页

作者： Koudouridis, Georgios P. Lundqvist, Henrik Li, Hong Gelabert, Xavier Huawei Technol Sweden AB Stockholm Sweden Huawei Technol Co Ltd Shanghai Peoples R China

Energy efficiency becomes increasingly important due to the limited battery capacity in wireless devices while at the same time user throughput requirements are relentlessly increasing. In this paper, we study an energy efficient cooperation scheme which employs network coding to enhance the energy efficiency for mobile devices. Herein we propose that the mobile devices are clustered into mobile small cells with one of the mobile devices acting as a group head with basic transceiver, coding and relaying functionalities. Group heads coordinate the transmissions from the mobile devices in the mobile small cell to the networks base stations. The objective function of the cooperative scheme is to minimize mobile devices' energy consumption subject to a certain bit error probability. The proposed network-coding based scheme has been evaluated by means of numerical simulations and compared to both a conventional direct transmit scheme, with no cooperation groups, and a cooperative relaying scheme. Results show that, with network-coded cooperation, energy efficiency may significantly increase provided the density of base stations and mobile devices is below a certain value. Above this value none of the compared cooperation schemes may improve energy efficiency, but rather power consumption is reduced only when mobile devices transmit via base stations in their close proximity.

关键词： Energy efficiency network coding Cooperative transmission Mobile small cells

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Research on Efficient Routing Algorithm Based on Dynamic Segmentation network coding

Research on Efficient Routing Algorithm Based on Dynamic Seg...

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作者： Li Cong Wu Yonghao City College Wuhan University of Science Technology Wuhan University

In order to solve the problem of existing routing algorithms,an efficient routing algorithm based on dynamic segmentation network coding(ERBNC) is *** compressing the header of the encoded packet,deleting the redundant ACK packet and setting the priority of sending the encoded packet,the proposed algorithm reduces the network overhead and packet average end-to-end *** simulation experiments of ERBNC algorithm,dynamic segmented network coding(DSNC) algorithm and segmented network coding(SNC) algorithm were completed by using OPNET simulation *** performance of various algorithms is compared and *** simulation results show that the ERBNC algorithm can effectively reduce the network overhead and reduce the average end-to-end delay of data packets.

关键词： Delay Tolerant networks Routing Algorithms network coding Decoding Predictions Redundant Control

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Noncoherent LDPC-coded physical-layer network coding using multitone FSK

arXiv

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arXiv 2018年

作者： Ferrett, Terry Valenti, Matthew C. Lane Department of Computer Science and Electrical Engineering West Virginia University MorgantownWV26506 United States

A noncoherent two-way relaying system is developed using physical-layer network coding for improved throughput over conventional relaying in a fading channel. Energy-efficient noncoherent operation is achieved using multitone frequency shift keying (FSK). A novel soft-output demodulator is developed for the relay, and corresponding achievable exchange rates are found for Rayleigh fading and AWGN channels. Biterror rate performance approaching the achievable rate is realized using a capacity-approaching channel code and a receiver architecture that iterates between demodulation and channel decoding. Iterative decoding is performed feeding information back from the channel decoder to the demodulator. Additionally, error-rate performance is made to approach the achievable rate more closely by optimizing LDPC codes for this system. The energy efficiency improvement obtained by increasing the modulation order is more dramatic for the proposed physical-layer network coding scheme than it is for a conventional point-to-point system. Using optimized LDPC codes, the bit-error rate performance is improved by as much as 1.1 dB over a widely known standardized LDPC code, and comes to within 0.7 dB of the limit corresponding to the achievable rate. Throughout this work, performance for physical-layer network coding is compared to conventional network coding. When noncoherent FSK is used, physical-layer network coding enables higher achievable rates, and conventional network coding exhibits better energy efficiency at low rates. Copyright © 2018, The Authors. All rights reserved.

关键词： network coding

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Performance analysis of network coding with IEEE 802.11 DCF in multi-hop wireless networks

arXiv

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arXiv 2018年

作者： Kafaie, Somayeh Ahmed, Mohamed Hossam Chen, Yuanzhu Dobre, Octavia A. Department of Electrical and Computer Engineering Faculty of Engineering and Applied Science Memorial University St. John'sNLA1B 3X5 Canada Department of Computer Science Memorial University St. John'sNLA1B 3X5 Canada

network coding is an effective idea to boost the capacity of wireless networks, and a variety of studies have explored its advantages in different scenarios. However, there is not much analytical study on throughput and end-to-end delay of network coding in multi-hop wireless networks considering the specifications of IEEE 802.11 Distributed Coordination Function. In this paper, we utilize queuing theory to propose an analytical framework for bidirectional unicast flows in multi-hop wireless mesh networks. We study the throughput and end-to-end delay of inter-flow network coding under the IEEE 802.11 standard with CSMA/CA random access and exponential back-off time considering clock freezing and virtual carrier sensing, and formulate several parameters such as the probability of successful transmission in terms of bit error rate and collision probability, waiting time of packets at nodes, and retransmission mechanism. Our model uses a multi-class queuing network with stable queues, where coded packets have a non-preemptive higher priority over native packets, and forwarding of native packets is not delayed if no coding opportunities are available. Finally, we use computer simulations to verify the accuracy of our analytical model. Copyright © 2018, The Authors. All rights reserved.

关键词： network coding

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Secure physical layer network coding versus secure network coding

arXiv

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arXiv 2018年

作者： Hayashi, Masahito Graduate School of Mathematics Nagoya University Nagoya Japan Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Centre for Quantum Technologies National University of Singapore Singapore Singapore

Secure network coding realizes the secrecy of the message when the message is transmitted via noiseless network and a part of edges or a part of intermediate nodes are eavesdropped. In this framework, if the channels of the network has noise, we apply the error correction to noisy channel before applying the secure network coding. In contrast, secure physical layer network coding is a method to securely transmit a message by a combination of coding operation on nodes when the network is given as a set of noisy channels. In this paper, we give several examples of network, in which, secure physical layer network coding has advantage over secure network coding. Copyright © 2018, The Authors. All rights reserved.

关键词： network coding

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