煤矿井下无线传感器网络MAC协议设计与改进

here are no network protocols and network equipments that apply to underground large-scale application in coal mine monitoring field, the reason for that is there is no such kind of standards that suitable for the underground special circumstances. In order to find the bottleneck which has limited WSN’s application in coal mine, we establish the normative mathematical model of IEEE802.15.4, simulate IEEE802.15.4 standard in underground application performance, find some existing weaknesses of IEEE802.15.4, improve the CSMA-CA protocol and put forward a Distinguish Backoff Algorithm and Relay Data Priority Strategy suitable for multiple hop transmission. We also simulate the improved MAC protocol, in contrast with the original protocol, we find the network performance of improved MAC protocol such as the throughput, delay and packet loss rate is better than the original one.