Design And Implementation Of Key Technologies Of Dynamic Spectrum Sharing Based On Blockchain

Due to the growth of wireless communication equipment and the development of network technology,the demand for frequency continues to grow.In order to effectively share frequencies in a limited frequency resource environment,research should be conducted to develop spectrum sharing technologies.The traditional spectrum sharing research relies on the central authority to verify the authenticity of each spectrum sharing transaction.The lack of a secure spectrum sharing mechanism makes it vulnerable to numerous security threats.Secondly,the efficiency of the traditional spectrum sharing mechanism through spectrum sensing or spectrum database is not very high.Finally,due to co-channel interference and other interference,selfish and rational spectrum owners are unwilling to share spectrum resources without proper financial compensation.In order to solve the problem of the traditional spectrum sharing relying on the central agency to authenticate and verify each spectrum sharing transaction,and the lack of a secure spectrum sharing incentive mechanism,the paper uses the blockchain's distributed accounting function technology for spectrum management.The unique functions of the blockchain can not only ensure the security of access and data transmission,but also can ensure the effectiveness of the transaction process by writing applications to exchange data through smart contracts.Therefore,this paper studies the key technology of spectrum sharing based on blockchain,and proposes a dynamic spectrum sharing incentive algorithm based on game theory in blockchain network.On top of this,the dynamic spectrum trading system based on alliance chain is designed and implemented.(1)In the 5G heterogeneous network,various devices will be connected to the Internet to realize the Internet of Things(IoT)and the Internet of Everything(IoE).Aiming at the problems of insufficient utilization of spectrum resources and lack of incentive strategies among primary users(PUs).The thesis studies the spectrum pricing of primary users coexisting with secondary users(SUs)among multiple PUs in the blockchain Internet network.A spectrum sharing algorithm designed by Bertrand game is proposed.The purpose is to analyze the spectrum price game process among multiple PUs.Firstly,the spectrum sharing network model and transaction model are designed to study the bidding game between the main systems.Construct a Bertrand game model in which PUs act as game competitors.The purpose of this model is to maximize its profit.Secondly,by designing a reasonable utility function the Bertrand competition model is proved to be a supermodel game.And then prove the existence of Nash equilibrium solution.Then,according to the spectrum requirements of SUs the game model is divided into static game and dynamic game and the Nash equilibrium is solved respectively.Finally,an adaptive mutation mechanism is added to improve the particle swarm algorithm's optimal fast-searching strategy for Nash equilibrium.The simulation results of the game theory model show that when the algorithm proposed in the paper finally converges to the Nash equilibrium after iteration.The price is the most effective strategy for PUs.(2)On the basis of the design and research of the incentive algorithm,the problems of the lack of security in traditional spectrum sharing networks and the opaque spectrum trading process and the inability to guarantee the right of use are solved.Based on demand analysis and the architecture and core modules of the Fabric project.A spectrum sharing system architecture based on the alliance chain is designed.The spectrum trading process,spectrum management and transaction list are written into the spectrum general ledger to form a spectrum trading platform and form a distributed spectrum status database.In addition,in the spectrum trading rules,smart contract chain codes are used instead of contracts to realize on-chain payment,monitoring and traceability of transaction data and forming a complete spectrum sharing process.In turn,efficient sharing and security control of spectrum resources are realized and spectrum utilization is improved.