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Harmonious Cross-Technology Coexistence With Heterogeneous Traffic in Unlicensed Bands: Analysis and Approximations

IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND networkING 2019年第3期5卷 690-701页

作者： Hirzallah, Mohammed Krunz, Marwan Xiao, Yong Univ Arizona Dept Elect & Comp Engn Tucson AZ 85721 USA Univ Technol Sydney Sch Elect & Data Engn Sydney NSW 2007 Australia Hauzhong Univ Sci & Technol Sch Elect Informat & Commun Wuhan 430074 Hubei Peoples R China

The dramatic growth in demand for mobile data has prompted mobile network operators (MNOs) to explore spectrum sharing in unlicensed bands. MNOs have been allowed recently to operate their LTE services over the 5 GHz Unlicensed National Information Infrastructure (U-NII) bands, currently occupied by Wi-Fi. The unlicensed LTE operation has been standardized by 3GPP under the name Licensed Assisted Access (LAA). Unlicensed 5G New radio (NR) operation over the U-NII bands, a.k.a., NR-Unlicensed (NR-U), is also being explored. To support applications with diverse Quality-of-Service (QoS) requirements, LAA, NR-U, and Wi-Fi technologies offer multiple priority classes with different contention parameters for accessing an unlicensed channel. How these different classes affect the interplay between coexisting MNOs and Wi-Fi systems is still a relatively under-explored topic. In this paper, we develop a simple yet efficient framework for fair coexistence between LTE MNOs and Wi-Fi systems, each with multiple priority classes. We derive approximated closed-form solutions for the probability of successful transmission (PST), average contention delay, and average throughput when coexisting LAA and Wi-Fi devices serve traffic with different priority classes. LTE and Wi-Fi operators can fit our solutions to estimate the performance of both systems in offline or online fashions, and use them to further optimize their system throughput and latency. Our results reveal that PSTs computed with our approximate models are within 5% difference with those obtained via close-to-real simulation under dense network deployments and high traffic loads.

关键词： Cross-technology coexistence licensed assisted access (LAA) 5G new radio unlicensed (NR-U) IEEE 802.11 Wi-Fi Markov analysis network modeling and simulation

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modeling Spatial Electrical Properties in Photovoltaic Modules Using PV-oriented Nodal Analysis

Modeling Spatial Electrical Properties in Photovoltaic Modul...

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39th Annual Conference of the IEEE Industrial-Electronics-Society (IECON)

作者： Wu, Xiaofeng Bliss, Martin Betts, Tom Gottschalg, Ralph Sinha, Archana Gupta, Rajesh Univ Loughborough CREST Loughborough Leics England Indian Inst Technol Dept Energy Sci & Engn Bombay Maharashtra India

ISBN: (纸本)9781479902248

Inhomogeneities in photovoltaic (PV) devices can cause spatially nonuniform performances and hence electrical mismatches which will reduce the overall power generation. A hierarchical distributed electrical network modeling technique is developed to investigate localized electrical properties and their impacts on the change of power generation of PV modules. A PV-oriented nodal analysis method is developed to enable the spatially-resolved quantitative analysis of electrical operating points by given localized properties. The simulation results show that the spatial electrical operating points and the overall electrical power output of the module can be calculated from distributed parameters. The possibility of combining this modeling approach with physical characterization techniques is discussed. This approach allows reconstructing PV modules utilizing material related parameters and acceleration over conventional methods, which may enable it to be a manufacturing relevant simulation tool.

关键词： photovoltaics network modeling and simulation PV-oriented nodal analysis spatially-resolved characterization

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modeling Spatial Electrical Properties in Photovoltaic Modules Using PV-oriented Nodal Analysis

Modeling Spatial Electrical Properties in Photovoltaic Modul...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Xiaofeng Wu Martin Bliss Tom Betts Ralph Gottschalg Archana Sinha Rajesh Gupta Centre for Renewable Energy Systems Technology (CREST) Loughborough University Department of Energy Science and Engineering Indian Institute of Technology Bombay

ISBN: (纸本)9781479902255

关键词： Photovoltaics network modeling and simulation PV-oriented nodal analysis Spatially-resolved characterization PHOTOVOLTAIC Solar Energy Power output Pv modules nodal analysis Power production Solar collectors electrical properties Electricity Inhomogeneities simulation tool modeling

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A Design of network simulation Environment using SSFNet

A Design of Network Simulation Environment using SSFNet

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1st International Conference on Advances in System simulation

作者： Yoon, Sunghyun Kim, Young Boo Elect & Telecommun Res Inst Ambient Commun Res Team Taejon 305606 South Korea

ISBN: (纸本)9781424448630

network simulation tool is needed to verify the functionalities and performance of networks. The SSFNet (Scalable simulation Framework network Models) is a network simulation tool using open source software with various network simulation applications. It has been designed for the expansion of network including topology, protocols, traffic, and etc, and is able to support simulation for the large-scale network like Internet. However it is not easy for general users to perform network simulation using SSFNet because the SSFNet does not provide users with any supplementary tools for designing of network elements and topology, and analyzing of simulation results. The network modeling and analysis process must be done manually by users themselves. This circumstance makes it difficult to perform reliable network simulation. In this paper, we design a network simulation environment available for SSFNet. Using this environment, users can build network simulation model effectually and analyze the simulation results without difficulty.

关键词： SSFNet network simulation Tool DML network modeling and simulation

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Comparing Trade-off Based Models of the Internet

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FUNDAMENTA INFORMATICAE 2009年第4期92卷 363-372页

作者： Spatharis, Anthony Foudalis, Ilias Sideri, Martha Papadimitriou, Christos Athens Univ Econ & Business Dept Comp Sci Athens 10434 Atiki Greece Univ Calif Berkeley Dept Comp Sci Berkeley CA 94720 USA

We introduce and evaluate several new models of network growth. Our models are extensions of the FKP model, modifying and improving it in various dimensions. In all these models nodes arrive one by one, and each node is connected to previous nodes by optimizing a trade-off between a geometric objective ("last mile cost") and a topological objective ("position in the network"). Our new models differ from the original FKP model in directions inspired by the real Internet: two or more edges are attached to each arriving node (while the FKP model produces a tree);these edges are chosen according to various criteria such as robustness;edges may be added to the network between old nodes;or only certain "fertile" nodes (an attribute that changes dynamically) are capable of attracting new edges. We evaluate these models, and compare them with the graph of the Internet's autonomous systems, with respect to a suite of many test parameters (such as average degree, power law exponent, and local clustering rank) proposed in the literature;to this end we have developed the network generation and measurement system Pandora.

关键词： Internet topology power law scale-free graphs network generators network modeling and simulation complex networks

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modeling Gene Regulatory networks by Incremental Evolution and System Decomposition

Modeling Gene Regulatory Networks by Incremental Evolution a...

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Asia simulation Conference/7th International Conference on System simulation and Scientific Computing

作者： Lee, Wei-Po Hsiao, Yu-Ting Natl Sun Yat Sen Univ Dept Informat Management Kaohsiung Taiwan

ISBN: (纸本)9781424417865

Constructing genetic regulatory networks from expression data is one of the most important issues In system biology research. However, building regulatory models manually Is it tedious task, especially when the number of genes involved increases with the complexity of regulation. To automate the procedure of network construction, we develop a methodology, to infers-systems as regulatory systems. Our work also deals with the scalability problem by an Incremental evolution strategy and a network decomposition method with several data analysis techniques. To verify the presented approaches, experiments have been conducted and the results show that they can he used to infer gene regulatory networks successfully.

关键词： Gene Regulatory network network modeling and simulation Incremental Evolution System Decomposition System Biology

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A generic solution to software-in-the-loop

A generic solution to software-in-the-loop

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IEEE Military Communications Conference (MILCOM 2007)

作者： Demers, Stephanie Gopalakrishnan, Praveen Kant, Latha Telcordia Technol Appl Res Red Bank NJ USA

ISBN: (纸本)9781424415120

The low fidelity and speed of traditional simulations have become unacceptable for the complex large-scale networks of today. In this paper we propose alternative techniques and focus on a software-in-the-loop implementation. Software-in-theloop provides us with the following two-fold advantages: (a) it helps solve traditional simulation problems of model validity and (b) it can be used in the design phase as well as in the testing phase of a project. However, software-in-the-loop brings its own set of challenges, as we discuss in this paper. We will present a generic end-to-end solution that mitigates the challenges of a software-in-the-loop configuration to bring it it to its full potential. The success of our solution will be exemplified by its use in two government funded projects where it was successfully used to analyze scalabitity performance in one case and to perform unit and integration testing in a second case. The focus of this paper will be on the use of software-in-the-loop versus traditional simulations, discussing the challenges, issues and decision processes involved with the use of software-in-the-loop.

关键词： software-in-the-loop real-time simulation network modeling and simulation event-driven simulation ad-hoc large-scale networks

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BUILDING A simulation TOOLKIT FOR WIRELESS MESH CLUSTERS AND EVALUATING THE SUITABILITY OF DIFFERENT FAMILIES OF AD HOC PROTOCOLS FOR THE TACTICAL network TOPOLOGY

BUILDING A SIMULATION TOOLKIT FOR WIRELESS MESH CLUSTERS AND...

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作者： Karapetsas, Konstantinos Naval Postgraduate School

学位级别：硕士

Wireless mesh networking has emerged as the successor of the traditional ad hoc networks. New technological advances, the standardization of protocols and interfaces and the maturity of key components have made it possible for current mesh research groups to set goals that are really close to the world's expectations. The objective of this research is to design and implement a simulation toolkit for wireless mesh clusters that can be used as an additional performance evaluation technique for the Tactical network Topology program of Naval Postgraduate School. This toolkit is implemented in the OPNET simulation environment and it incorporates various nodes running different ad hoc routing protocols. Furthermore, the investigation of a suitable combination of protocols for the Tactical network Topology is achieved by creating scenarios and running a number of simulations using the mesh toolkit.

关键词： Ad Hoc networking MANET Wireless Mesh networks OLSR DSR AODV Tactical network Topology OPNET IEEE 802.16 DOCSIS network modeling and simulation

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Agents: A solution for telecommunication network simulation

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1st International Conference on network Control and Engineering for Quality of Service, Security and Mobility (Net-Con 2002)

作者： Merghem, L Lecarpentier, H Univ Paris 06 LIP6 F-75252 Paris 05 France

ISBN: (纸本)1402072686

Since several years, telecommunication networks have steadily grown in size and complexity due to the continually growing of users requirements for dynamicity, security and services. Several approaches, such as policy-based networking, active and mobile networks have been proposed in order to satisfy these requirements. Existing approaches of modeling and simulation (like queuing systems for example) cannot represent, test and evaluate such a dynamic environment. This paper presents a behavior-based multi-agent solution to model and simulate dynamic telecommunication networks. Five elementary nodes' behaviors (basic, careful, selective, faithful and unfaithful) have been implemented and tested by using the multi-agent platform Swarm. Our aim was to measure the impact of introducing the behaviors on the node's performances (loss of packets, response time and standard deviation of important packets).

关键词： network modeling and simulation multi-agent simulation behavioral modeling dynamic networks

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Modelování a simulace BGP

Modelování a simulace BGP

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作者： Novák, Adrián Brno University of Technology

Práca sa zaoberá modelovaním a simuláciou BGP protokolu v rámci prostredia OMNeT++. V úvodnej časti je priblížený BGP protokol, jeho základné dátové štrukt&#... 详细信息

Práca sa zaoberá modelovaním a simuláciou BGP protokolu v rámci prostredia OMNeT++. V úvodnej časti je priblížený BGP protokol, jeho základné dátové štruktúry a konečný automat nadviazania susedstva. Ďalej je predstavený spôsob konfigurácie protokolu na Cisco zariadeniach. Následne je uvedený popis aktuálneho stavu implementácie BGP protokolu v rámci simulačného prostredia OMNeT++, jeho nedostatky a zistené problémy. Druhá časť práce sa zaoberá návrhom, implementáciou a testovaním danej funcionality BGP protokolu a simulačných modelov. Na záver sú uvedené celkové dosiahnute výsledky a zhodnotenie práce.

关键词： BGP Border gateway protocol OMNeT++ ANSAINET INET modelovanie a simulácia sietí BGP Border gateway protocol OMNeT++ ANSAINET INET network modeling and simulation Text

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