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Wireless blockchain networks have played an important role in many networkscenarios, among which wireless Practical Byzantine Fault Tolerance (PBFT)consensus is regarded as one of the most important consensus mechanisms. Itenables nodes in wireless networks to reach consistency without any trustedentity. However, due to the instability of wireless communication links, thereliability of the PBFT consensus will be seriously affected. Meanwhile, it isdifficult for nodes in wireless scenarios to obtain a timely energy supply. Thehigh-energy-consumption blockchain functions will quickly consume the power ofnodes, thus, affecting consensus performance. Fortunately, the symbiotic radio(SR) system enabled by cognitive backscatter communications can provide asolution to the above problems. In SR, the secondary transmitter (STx)transmits messages by modulating its information over the radio frequency (RF)signal of the primary transmitter (PTx) with extremely low energy consumption,and the STx can provide multipath gain to the PTx in return. In our paper, wepropose the symbiotic PBFT (S-PBFT) consensus benefited from the mutualistictransmission in SR, which can increase the consensus security by 54.82%, andsave energy consumption by about 10%.

Symbiotic PBFT Consensus: Cognitive Backscatter Communications-enabled Wireless PBFT Consensus