Improvement strategy of S-MAC protocol for wireless sensors in IoT based on data and energy priorities

Wireless sensors are widely used in the Internet of things. In this paper, the S-MAC protocol is enhanced by extending IEEE802.11 data frame and combining data and energy priority, so as to solve the portability problem of priority data. The improved strategy enables the wireless sensor nodes to transmit data and energy according to the priority and network load in the process of data transmission competition window to reduce unnecessary conflicts. The improved protocol simulation test using NS2 simulation platform shows that the improved S-MAC protocol reduces the data transmission delay of sending different levels of priority information, achieves balanced network load, and prolongs the network life time