【Author】
Xu, Yueqiang; Zhang, Heli; Ji, Hong; Yang, Lichao; Li, Xi; Leung, Victor C. M.
【Source】IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
【Abstract】The integration of blockchain and mobile edge computing (MEC), as a secure, efficient, and reliable edge computing paradigm, has been widely applied in many applications, such as large-scale Internet of Things (IoT), Internet of Vehicles (IoV), and smart grid. However, due to the restricted transaction throughput of blockchain, the combination of blockchain and MEC in most existing works cannot support applications with frequent transaction requirements. In this paper, we propose an integrated blockchain and MEC (IBM) framework based on a space-structured ledger to meet the transaction demands for IoT applications. In the framework, a collaborative mining process is designed, where we consider the cooperation between mobile devices (MDs) and MEC servers. To promote mining efficiency, we further develop a high-performance consensus mechanism called reputation-based proof of work (Re-PoW), in which differentiated mining targets are assigned according to the reputation of MDs. In the Re-PoW consensus mechanism, heterogeneous capabilities and historical behaviors of MDs are all considered for accurately evaluating their reputation. In addition, we present an alternating optimization algorithm by jointly optimizing bandwidth allocation and computation resource allocation to further enhance the performance of the proposed scheme. Simulation results show that the proposed approach can achieve significant throughput improvement.
【Keywords】Blockchains; Throughput; Wireless communication; Servers; Optimization; Security; Resource management; Internet of Things; mobile edge computing; blockchain; transaction throughput
【标题】物联网中集成区块链和MEC系统的交易吞吐量优化
【摘要】区块链与移动边缘计算（MEC）的融合作为一种安全、高效、可靠的边缘计算范式，已广泛应用于大规模物联网（IoT）、车联网（IoV）等众多领域。和智能电网。但是，由于区块链的交易吞吐量受限，现有大部分作品中区块链与MEC的结合无法支持交易需求频繁的应用。在本文中，我们提出了一种基于空间结构账本的集成区块链和 MEC (IBM) 框架，以满足物联网应用的交易需求。在该框架中，设计了一个协作挖掘过程，我们考虑了移动设备（MD）和 MEC 服务器之间的协作。为了提高挖矿效率，我们进一步开发了一种称为基于信誉的工作量证明（Re-PoW）的高性能共识机制，其中根据 MD 的信誉分配不同的挖矿目标。在 Re-PoW 共识机制中，MD 的异构能力和历史行为都被考虑在内，以准确评估其声誉。此外，我们提出了一种交替优化算法，通过联合优化带宽分配和计算资源分配来进一步提高所提出方案的性能。仿真结果表明，所提出的方法可以显着提高吞吐量。
【关键词】区块链；吞吐量；无线通信;服务器；优化;安全;资源管理;物联网;移动边缘计算；区块链；交易吞吐量
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