Research On Blockchain Consensus Mechanism For Wireless Network

Mobile communication is an important infrastructure that reflects national strategic planning and supports the operation of the whole society.However,in recent years,with the continuous deepening of wireless network densification,isomerization,scale and openness,the development of mobile communication systems faces many crises and challenges in trust and security.Existing mobile communication systems often use a centralized scheme to control and schedule multiple types of wireless network resources,which causes network managers to suffer from network attacks and single-point failures,and the high trust barriers in the network also lead to the inability to efficiently share and utilize wireless network resources.As a kind of natural distributed trust mechanism maintained by multi-party cooperation,blockchain can establish mutual trust between peer-to-peer network entities by virtue of its endogenous properties,which provides a solution to the trust and security problems of wireless networks.As the core part of the blockchain,the consensus mechanism directly affects the performance and security of the wireless blockchain network.In order to promote the in-depth integration of wireless networks and blockchain,and provide technical support for trust and security in mobile communications,this thesis will conduct research on the blockchain consensus mechanism for wireless networks,and analyze the impact of message propagation on the performance of the consensus mechanism.Firstly,this thesis discusses the relevant research basis of blockchain,and introduces the basic principle,layered structure and type division of blockchain.Then the thesis introduces the related cryptography technology of blockchain.Finally,the thesis introduces the smart contract of the blockchain and analyzes the basic principles and processes of various types of blockchain consensus mechanisms.Secondly,this thesis studies and improves the Proof of Communication(PoC)consensus mechanism.The thesis first introduces the message receiving model in PoC consensus mechanism.Then,based on this model,this thesis introduces the PoC consensus mechanism framework and technical solutions.Afterwards,the thesis proposes a Byzantine Fault Tolerance Proof of Communication(BFTPoC)consensus mechanism for PoC’s inability to tolerate Byzantine faults,and provides a mechanism framework and detailed technical solutions.Finally,the thesis analyzes the impact of different network scales and wake-up ratios on PoC consensus time and normalized throughput through simulation,and proves that BFTPoC can tolerate Byzantine faults,thus enhancing the security and scalability of PoC.Thirdly,in view of the dilemma that the traditional consensus mechanism is not suitable for wireless networks,this thesis designs a wide-area wireless network blockchain consensus mechanism based on random oracles,and analyzes the evolution mode and rules of the blockchain based on this consensus mechanism in many types of situations.Subsequently,the thesis studies and analyzes the throughput and security of the consensus mechanism of wide-area wireless networks,gives the maximum throughput under the limitation of network capacity and preliminarily discusses the impact of message propagation on blockchain consensus,and analyzes the important factors that affect the throughput and security of the blockchain.Finally,the simulation proves that the wide area wireless network consensus mechanism can achieve higher throughput with the same security as the proof of work consensus mechanism.At the same time,the thesis compares the throughput performance of PoC and wide-area wireless network consensus,and the results show that the throughput performance of the latter is better than that of the former,and the throughput performance of the latter is not constrained or affected by the size of the network,and has stronger scalability.Finally,this thesis studies the impact of message propagation on the blockchain consensus mechanism.The thesis first analyzes several mainstream blockchain network models,and extends the synchronous network model.Then,based on the extended synchronous network model,the thesis designs a blockchain state representation method,and studies the evolution law of the blockchain affected by message propagation based on the state representation method.Then,the thesis carries out steady-state analysis and performance characterization of the blockchain based on the Markov chain model.Finally,in the simulation and analysis,the thesis verifies the validity of the proposed model and characterization method,and analyzes the core factors affecting the normalized throughput and fork rate of the blockchain in message propagation,and provide technical means to improve the normalized throughput of the blockchain and reduce the fork rate of the blockchain.