【Author】
Liu, Wei; Zhang, Xuhao; Feng, Wenlong; Huang, Mengxing; Xu, Yun
【Abstract】In service-transaction scenarios, blockchain technology is widely used as an effective tool for establishing trust between service providers and consumers. The consensus algorithm is the core technology of blockchain. However, existing consensus algorithms, such as the practical Byzantine fault tolerance (PBFT) algorithm, still suffer from high resource consumption and latency. To solve this problem, in this study, we propose an improved PBFT blockchain consensus algorithm based on quality of service (QoS)-aware trust service evaluation for secure and efficient service transactions. The proposed algorithm, called the QoS-aware trust practical Byzantine fault tolerance (QTPBFT) algorithm, efficiently achieves consensus, significantly reduces resource consumption, and enhances consensus efficiency. QTPBFT incorporates a QoS-aware trust service global evaluation mechanism that implements service reliability ranking by conducting a dynamic evaluation according to the real-time performance of the services. To reduce the traffic of the blockchain, it uses a mechanism that selects nodes with higher values to form a consensus group that votes for consensus according to the global evaluation result of the trust service. A practical protocol is also constructed for the proposed algorithm. The results of extensive simulations and comparison with other schemes verify the efficacy and efficiency of the proposed scheme.
【Keywords】QoS-aware; blockchain; consensus mechanism; PBFT
【标题】基于QoS-Aware信任服务评估的PBFT算法优化
【摘要】在服务交易场景中，区块链技术被广泛用作在服务提供者和消费者之间建立信任的有效工具。共识算法是区块链的核心技术。然而，现有的共识算法，例如实用的拜占庭容错（PBFT）算法，仍然存在高资源消耗和延迟的问题。为了解决这个问题，在本研究中，我们提出了一种改进的基于服务质量（QoS）感知的信任服务评估的PBFT区块链共识算法，以实现安全高效的服务交易。该算法称为QoS感知信任实用拜占庭容错（QTPBFT）算法，高效达成共识，显着降低资源消耗，提高共识效率。 QTPBFT 引入了 QoS 感知的信任服务全局评估机制，通过根据服务的实时性能进行动态评估，实现服务可靠性排名。为了减少区块链的流量，它采用一种机制，选择价值较高的节点形成共识组，根据信任服务的全局评估结果投票支持共识。还为所提出的算法构建了一个实用的协议。广泛的模拟结果和与其他方案的比较验证了所提出方案的有效性和效率。
【关键词】QoS感知；区块链；共识机制； PBFT
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