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Blockchain-Empowered Dynamic Spectrum Management for Space-Air-Ground Integrated Network

Chinese Journal of Electronics 2022年第3期31卷 456-466页

作者： LI Zuguang WANG Wei GUO Jia ZHU Youwen HAN Lu WU Qihui College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information Technology

Space-air-ground integrated network is capable of providing seamless and ubiquitous services to cater for the increasing wireless communication demands of emerging applications. However, how to efficiently manage the heterogeneous resources and protect the privacy of connected devices is a very challenging issue, especially under the highly dynamic network topology and multiple trustless network operators. In this paper, we investigate blockchain-empowered dynamic spectrum management by reaping the advantages of blockchain and software defined network(SDN), where operators are incentive to share their resources in a common resourced pool. We first propose a blockchain enabled spectrum management framework for space-air-ground integrated network, with inter-slice spectrum sharing and intra-slice spectrum allocation. Specifically, the inter-slice spectrum sharing is realized through a consortium blockchain formed by the upper-tier SDN controllers, and then a graph coloring based channel assignment algorithm is proposed to manage the intra-slice spectrum assignment. A bilateral confirmation protocol and a consensus mechanism are also proposed for the consortium blockchain. The simulation results prove that our proposed consensus algorithm takes less time than practical Byzantine fault tolerance algorithm to reach a consensus, and the proposed channel assignment algorithm significantly improves the spectrum utilization and outperforms the baseline algorithm in both simulation and real-world scenarios.

关键词： consensus mechanism space communication links blockchains blockchain-empowered dynamic spectrum management radio spectrum management multiple trustless network operators wireless communication demands graph coloring software defined networking inter-slice spectrum sharing graph colouring upper-tier SDN controllers fault tolerant computing protocols Byzantine fault tolerance algorithm spectrum utilization space-air-ground integrated network channel allocation software defined network channel assignment algorithm consortium blockchain intra-slice spectrum assignment intra-slice spectrum allocation telecommunication network topology highly dynamic network topology

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colouring of COVID-19 Affected Region Based on Fuzzy Directed graphs

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Computers, Materials & Continua 2021年第7期68卷 1219-1233页

作者： Rupkumar Mahapatra Sovan Samanta Madhumangal Pal Jeong-Gon Lee Shah Khalid Khan Usman Naseem Robin Singh Bhadoria Department of Applied Mathematics with Oceanology and Computer Programming Vidyasagar UniversityMidnapore721102India Department of Mathematics Tamralipta MahavidyalayaTamluk721636India Division of Applied Mathematics Wonkwang UniversityIksan-SiJeonbuk54538Korea School of Engineering RMIT UniversityMelbourne3001Australia School of Computer Science University of Sydney Sydney2006Australia Department of Computer Science&Engineering Birla Institute of Applied Sciences(BIAS)BhimtalUttarakhand263136India

graph colouring is the system of assigning a colour to each vertex of a *** is done in such a way that adjacent vertices do not have equal *** is fundamental in graph *** is often used to solve real-world problems like traffic light signalling,map colouring,scheduling,***,social networks are prevalent systems in our ***,the users are considered as vertices,and their connections/interactions are taken as *** users follow other popular users’profiles in these networks,and some don’t,but those non-followers are connected directly to the popular *** means,along with traditional relationship(information flowing),there is another relation among *** depends on the domination of the relationship between the *** type of situation can be modelled as a directed fuzzy *** the colouring of fuzzy graph theory,edge membership plays a vital *** membership is a representation of flowing information between end nodes of the *** from the communication relationship,there may be some other factors like domination in *** influence of power is captured *** this article,the colouring of directed fuzzy graphs is defined based on the influence of *** with this,the chromatic number and strong chromatic number are provided,and related properties are *** application regarding COVID-19 infection is presented using the colouring of directed fuzzy graphs.

关键词： graph colouring chromatic index directed fuzzy graphs

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A Com binatorial Approach for Topological Classification of graphlike M anifolds

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Chinese Quarterly Journal of Mathematics 1998年第3期13卷 1-11,页

作者：林诒勋王勤 Department of

The concept of graphlike manifolds was presented in [1] and the problem of counting the homeomorphic classes of graphlike manifolds has been studied in a series of articles, e.g., [1～8]. In this paper we suggest an a... 详细信息

关键词： graphlike manifold graph colouring equivalence classes enumeration

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On the Number of Solutions of Some Type Equations in Finite Fields

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Northeastern Mathematical Journal 2005年第1期21卷 18-24页

作者：林泓钱建国 Department of Mathematics Xiamen University Xiamen 361005

By establishing the connection between graph colouring and the solution of some equation systems in finite fields, we obtain some formulas to the number of solutions of some equation systems in finite fields, in terms... 详细信息

关键词： graph colouring equation finite field

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