Abstract: The transmissions of information in wireless multi-hop network with multiple relay nodes may easily cause inter- and intra-path interference and bit error accumulation. The reliability-guaranteed mechanism for multi-hop data transmission has been the keystone of research. In the light of the lack of recent research on the performance of reliability mechanism, in which mechanism parameters, business parameters and channel parameters are overall considered, the models of packet delivery ratio and overhead are established, and the influences of basic parameters on the performance of three multi-hop reliability mechanisms, including redundant transmission, retransmission and network coding, are analyzed. The applicable parameters and environment of network coding mechanism are modeled, simulated and analyzed. According to the wireless multi-hop network channel environment, the mechanism parameters of three reliability mechanisms are optimized, and their performances in different environments are compared. Simulated results show that the business parameters have greater impact on the network coding mechanism, and the network coding mechanism can achieve better performance in the case of large traffic. The mechanism parameters have the most significant impact on protocol performance. The target delivery rate performance with smaller overhead can be achieved by optimizing the mechanism parameters according to the channel parameters. Network coding, hybrid automatic repeat request and forward error correction coding schemes have better performances at lower, middle and higher bit error rates. Key

Key words: communicationtechnology, wirelesscommunication, multi-hop, reliability, networkcoding