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Wireless blockchain network is proposed to enable a decentralized and safewireless networks for various blockchain applications. To achieve blockchainconsensus in wireless network, one of the important steps is to broadcast newblock using wireless channel. Under wireless network protocols, the blocktransmitting will be affected significantly. In this work, we focus on theconsensus process in blockchain-based wireless local area network (B-WLAN) byinvestigating the impact of the media access control (MAC) protocol, CSMA/CA.With the randomness of the backoff counter in CSMA/CA, it is possible forlatter blocks to catch up or outpace the earlier one, which complicatesblockchain forking problem. In view of this, we propose mining strategies topause mining for reducing the forking probability, and a discard strategy toremove the forking blocks that already exist in CSMA/CA backoff procedure.Based on the proposed strategies, we design Block Access Control (BAC)approaches to effectively schedule block mining and transmitting for improvingthe performance of B-WLAN. Then, Markov chain models are presented to conductperformance analysis in B-WLAN. The results show that BAC approaches can helpthe network to achieve a high transaction throughput while improving blockutilization and saving computational power. Meanwhile, the trade-off betweentransaction throughput and block utilization is demonstrated, which can act asa guidance for practical deployment of blockchain.

Block Access Control in Wireless Blockchain Network: Design, Modeling and Analysis