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arXiv 2020年

作者： Zhang, Jinglin Xu, Wenjun Gao, Hui Pan, Miao Han, Zhu Zhang, Ping Key Lab of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing100876 China Key Laboratory of Trustworthy Distributed Computing and Service Ministry of Education Beijing University of Posts and Telecommunications Beijing100876 China Department of Electrical and Computer Engineering University of Houston HoustonTX77204 United States University of Houston HoustonTX77004 United States Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing100876 China

Millimeter wave (mmWave) communications can potentially meet the high data-rate requirements of unmanned aerial vehicle (UAV) networks. However, as the prerequisite of mmWave communications, the narrow directional beam tracking is very challenging because of the three-dimensional (3D) mobility and attitude variation of UAVs. Aiming to address the beam tracking difficulties, we propose to integrate the conformal array (CA) with the surface of each UAV, which enables the full spatial coverage and the agile beam tracking in highly dynamic UAV mmWave networks. More specifically, the key contributions of our work are three-fold. 1) A new mmWave beam tracking framework is established for the CA-enabled UAV mmWave network. 2) A specialized hierarchical codebook is constructed to drive the directional radiating element (DRE)-covered cylindrical conformal array (CCA), which contains both the angular beam pattern and the subarray pattern to fully utilize the potential of the CA. 3) A codebook-based multiuser beam tracking scheme is proposed, where the Gaussian process machine learning enabled UAV position/attitude predication is developed to improve the beam tracking efficiency in conjunction with the tracking-error aware adaptive beamwidth control. Simulation results validate the effectiveness of the proposed codebook-based beam tracking scheme in the CA-enabled UAV mmWave network, and demonstrate the advantages of CA over the conventional planner array in terms of spectrum efficiency and outage probability in the highly dynamic scenarios. Copyright © 2020, The Authors. All rights reserved.

关键词： Millimeter waves

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Flexible triangular formation keeping of marine robotic vehicles using range measurements 19

Flexible triangular formation keeping of marine robotic vehi...

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19th IFAC World Congress on International Federation of Automatic Control, IFAC 2014

作者： Rego, Francisco Soares, Jorge M. Pascoal, António Aguiar, A. Pedro Jones, Colin Laboratory of Robotics and Systems in Engineering and Science Instituto Superior Técnico University of Lisbon Lisbon Portugal Department of Electrical and Computer Engineering Faculty of Engineering University of Porto Porto Portugal Institute of Mechanical Engineering School of Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland Distributed Intelligent Systems and Algorithms Laboratory School of Architecture Civil and Environmental Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland National Institute of Oceanography Dona Paula Goa India

ISBN: (纸本)9783902823625

This paper addresses the problem of keeping an autonomous marine vehicle in a moving triangular formation by regulating its position with respect to two leader vehicles. The follower vehicle has no prior knowledge of the path described by the leaders but has access to their heading angle and is able to measure inter-vehicle ranges. It is assumed that the distance between the leaders is constant and known. A control strategy is adopted that generates speed and heading commands so as to drive suitably defined along track and cross track errors to zero. The commands are used as input to local inner loops for yaw and speed control. The paper describes the algorithms derived for range-based control and assesses their performance in simulations using realistic models of the vehicles involved. Tests with three autonomous marine vehicles equipped with acoustic modems and ranging devices allow for the evaluation of the performance of the algorithms in a real-world situation. © IFAC.

关键词： Vehicle performance

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Flexible triangular formation keeping of marine robotic vehicles using range measurements 1

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IFAC Proceedings Volumes 2014年第3期47卷 5145-5150页

作者： Francisco Rego Jorge M. Soares António Pascoal A. Pedro Aguiar Colin Jones Laboratory of Robotics and Systems in Engineering and Science Instituto Superior Técnico University of Lisbon Lisbon Portugal Department of Electrical and Computer Engineering Faculty of Engineering University of Porto Porto Portugal Institute of Mechanical Engineering School of Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland Distributed Intelligent Systems and Algorithms Laboratory School of Architecture Civil and Environmental Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland National Institute of Oceanography Dona Paula Goa India

关键词： Autonomous Vehicles Marine Systems Control Laws Formation Control Station Keeping Triangular Formations

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Multi-agent programming contest 2013: The teams and the design of their systems

Multi-agent programming contest 2013: The teams and the desi...

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1st International Workshop on engineering Multi-Agent Systems, EMAS 2013

作者： Ahlbrecht, Tobias Bender-Saebelkampf, Christian De Brito, Maiquel Christensen, Nicolai Christian Dix, Jürgen Franco, Mariana Ramos Heller, Hendrik Hess, Andreas Viktor Heßler, Axel Hübner, Jomi Fred Jensen, Andreas Schmidt Johnsen, Jannick Boese Köster, Michael Li, Chengqian Liu, Lu Morato, Marcelo Menezes Ørum, Philip Bratt Schlesinger, Federico Schmitz, Tiago Luiz Sichman, Jaime Simão De Souza, Kaio Siqueira Uez, Daniela Maria Villadsen, Jørgen Werner, Sebastian Woller, Øyvind Grønland Zatelli, Maicon Rafael Department of Informatics Clausthal University of Technology Julius-Albert-Str. 4 38678 Clausthal-Zellerfeld Germany Dept. of Computer Science Sun Yat-sen University Guangzhou 510006 China Algorithms Logic and Graphs Section Department of Applied Mathematics and Computer Science Technical University of Denmark Matematiktorvet DK-2800 Kongens Lyngby Denmark Brazil Distributed Artificial Intelligence Laboratory Technische Universität Berlin Germany Department of Automation and Systems Engineering Federal University of Santa Catarina CP 476 88040-900 Florianópolis - SC Brazil

ISBN: (纸本)9783642453427

Five teams participated in the Multi-Agent Programming Contest in 2013: All of them gained experience in 2012 already. In order to better understand which paradigms they used, which techniques they considered important and how much work they invested, the organisers of the contest compiled together a detailed list of questions (circa 50). This paper collects all answers to these questions as given by the teams. © 2013 Springer-Verlag.

关键词： Multi agent systems

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Adaptive admission control of multimedia traffic in high-speed networks

Adaptive admission control of multimedia traffic in high-spe...

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IEEE International Symposium on Intelligent Control (ISIC)

作者： S. Jagannathan A. Tohmaz A. Chronopoulos H.G. Cheung Embedded Systems and Networking Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA Parallel and Distributed Systems Lab Department of Computer Science University of Texas-San Antonio TX USA

This paper proposes a novel real-time adaptive admission control (AAC) scheme with a desired quality of service (QoS) guarantee and high network utilization in high speed networks. The QoS is given in terms of service delay, which is defined as the time it takes for a source to get admitted into the network after it initiates its intended request, packet/cell losses, and transmission delay (time taken to complete transmission from its initiation). AAC uses the following information - the available capacity from a novel adaptive bandwidth estimation scheme, a congestion indicator derived from a congestion controller, peak cell rate estimate from new sources, along with the desired QoS metrics, and outputs an 'admit' or 'reject' decision signal to the new sources while guaranteeing QoS and network utilization. Simulation results are presented by streaming ON/OFF and video data into the network. Results show that the proposed AAC admits significantly more traffic compared to other available admission control schemes thereby guaranteeing high network utilization while maintaining the desired QoS.

关键词： Programmable control Adaptive control Admission control Communication system traffic control High-speed networks Quality of service Delay effects Propagation losses Bandwidth Streaming media

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Incremental, dynamic, virtual circuit connection (IVCC): a new paradigm for routing in future high-speed networks

Incremental, dynamic, virtual circuit connection (IVCC): a n...

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IEEE International Conference on Communications (ICC)

作者： Q. Razouqi T. Lee Seong-Soon Joo S. Ghosh Electrical Engineering Department Kuwait University Kuwait Networking and Distributed Algorithms Laboratory Department of Computer Science & Engineering Arizona State University Tempe AZ USA Electronics and Telecommunications Research Institute Daejeon South Korea

This paper presents a new routing strategy, termed incremental virtual circuit connection (IVCC), that is ideally suited for a class of call requests that promise to underlie future high-speed networks. IVCC aims to reduce the idling of reserved resources, thereby improving the sharing of network resources among users and increasing call success rate. Under IVCC, the subsequent subpaths, starting at the source node, are computed, reserved, and utilized incrementally. Initially, the source node (SN) computes the entire path all the way to the destination node (DN), but propagates the call admission control (CAC) to reserve network resources only for a subset of the entire path, where the choice of the subpath is based on the organization and topology of the network. This paper hypothesizes that the efficient use of resources in IVCC will significantly reduce the probability of failures. Thus, IVCC's uniqueness consists of two key elements. First, the actual route for a source traffic is successively and dynamically refined, utilizing up-to-date information on the state of the network, but always keeping an "eye" towards the destination. Second, traffic cells are launched from the source node or any of the intermediate nodes only after the network resources along the subsequent subpath have been reserved. IVCC has been modeled for two representative ATM networks, a 15-node network spread over the continental US and a 50-node network extending throughout the world, and extensively simulated for a large number of realistic input traffic stimuli utilizing an asynchronous distributed simulation algorithm running on a network of workstations. For a comparative analysis, ATM Forum's P-NNI is also modeled and simulated for identical networks and under identical traffic conditions.

关键词： Circuits Telecommunication traffic Traffic control Asynchronous transfer mode Routing High-speed networks Tin computer networks Call admission control Network topology

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Unifying the secure DoD network and public ATM network infrastructure

Unifying the secure DoD network and public ATM network infra...

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MILCOM, Military Communications Conference

作者： H.J. Schumacher S. Ghosh Networking and Distributed Algorithms Lab Department of Computer Science & Engineering Arizona State University Tempe AZ USA

The desire to transport classified traffic securely utilizing the current network security paradigm has led the US department of Defense (DoD) to maintain its own, isolated network, distinct from the public ATM network infrastructure. Internally, the DoD maintains four completely separate and isolated networks to carry top-secret, secret, confidential, and unclassified traffic, respectively. A public ATM network may be viewed as carrying unclassified or non-secure traffic. While the cost of maintaining four separate networks is becoming increasingly prohibitive to the DoD, the inability of the public and DoD to utilize each other's network resources runs counter to the current atmosphere of dual use and economies of scale. This paper introduces the concept of a "mixed use" network, wherein the four DoD networks and the public ATM network are coalesced into a single, unified network that transports all four types of traffic, efficiently and without compromising their respective security. In "mixed use", the ATM nodes and links that are common between the DoD and public networks are labeled "joint use" and fall under the jurisdiction of the military for obvious protection of the security assets. The concept of mixed use is the direct result of the user-level, security on demand principle that is enabled by the fundamental security framework and the basic characteristic of ATM networks. This paper models a representative 32-node public ATM network, a 40-node DoD network, and the coalesced 50-node "mixed use" network, and executes accurate simulations on a testbed that, in turn, executes on a network of Linux workstations configured as a loosely-coupled parallel processor.

关键词： US department of Defense Telecommunication traffic Information security Costs Testing Defense industry Government distributed algorithms computer science Maintenance engineering

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Scalable hardware priority queue architectures for high-speed packet switches

Scalable hardware priority queue architectures for high-spee...

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Real-Time Technology and Applications Symposium

作者： S.-W. Moon K.G. Shin J. Rexford Real-Time Computing Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Network Mathematics Research Networking and Distributed Systems AT and T Research Laboratories Murray Hill NJ USA

In packet-switched networks, queueing of packets at the switches can result when multiple connections share the same physical link. To accommodate a large number of connections, a switch can employ link-scheduling algorithms to prioritize the transmission of the queued packets. Due to the high-speed links and small packet sizes, a hardware solution is needed for the priority queue in order to make the link schedulers effective. But for good performance, the switch should also support a large number of priority levels (P) and be able to buffer a large number of packets (N). So a hardware priority queue design must be both fast and scalable (with respect to N and P) in order to be implemented effectively. In this paper we first compare four existing hardware priority queue architectures, and identify scalability limitations on implementing these existing architectures for large N and P. Based on our findings, we propose two new priority queue architectures, and evaluate them using simulation results from Verilog HDL and Epoch implementations.

关键词： Packet switching Switches Traffic control Scheduling algorithm Asynchronous transfer mode Hardware design languages Communication system traffic control computer architecture Moon Real time systems

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