异步区块链支持的安全频谱共享  

Secure Spectrum Sharing Supported by Asynchronous Blockchain

作　　者：梁燕[1,2] 洪文超 邵凯 LIANG Yan;HONG Wenchao;SHAO Kai(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Key Laboratory of Signal and Information Processing,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]信号与信息处理重庆市重点实验室,重庆400065

出　　处：《电讯技术》2023年第10期1464-1471,共8页Telecommunication Engineering

摘　　要：针对目前频谱稀缺的困境,一个经济有效的解决方案是将未充分利用的授权频谱以机会的方式分配给未授权用户。然而,实现大规模频谱共享面临激励缺失、隐私泄露、安全威胁和时延过大等挑战。利用区块联盟链技术的安全机制,设计了由频谱接入层、区块链网络层、区块链共识层构成的区块链动态频谱接入系统。该系统采用异步实时拜占庭容错(Practical Byzantine Fault Tolerance,PBFT)改善共识延时,设计基于最优匹配算法的匹配方案,提高频谱复用率。经仿真验证,该方案频谱复用率提升近6%。相比于实时拜占庭机制,所提方案减少了系统延时,提升吞吐量近129%。A cost-effective solution to the current spectrum scarcity dilemma is to opportunistically allocate underutilized licensed spectrum to unlicensed users.However,realizing large-scale spectrum sharing faces challenges such as lack of incentives,privacy leakage,security threats,and excessive delay.Using the security mechanism of blockchain consortium technology,a blockchain dynamic spectrum access system composed of spectrum access layer,blockchain network layer,and blockchain consensus layer is designed.The system adopts an asynchronous Practical Byzantine Fault Tolerance(PBFT)to improve the consensus delay,and designs a matching scheme based on an optimal matching algorithm to improve the spectrum reuse rate.It is verified by simulation that the spectrum reuse rate of this scheme is increased by nearly 6%.Compared with PBFT,the proposed scheme reduces the system delay and improves the throughput by nearly 129%.

关 键 词：频谱共享 动态频谱接入 区块联盟链 实时拜占庭机制(PBFT) 最优匹配 

分 类 号：TN929.5[电子电信—通信与信息系统] TP311.1[电子电信—信息与通信工程]