Study of SPDS-TDMA Time Slot Allocation Protocol Based on Multi-Channel Communication

To the limitations of LoRaWan protocol, this paper proposes a SPDS-TDMA time slot allocation protocol based on multi-channel communication. The protocol has self-adaption channel rate planning and differential service mechanism. The protocol combines the ideas of CSMA/CA mechanism and Frequency division multiplexing on the basis of classical polling protocol. This protocol enables differentiated services while ensuring communication reliability. Simulation results on OPNET show that the protocol has better network performance in terms of time-delay and the rate of package loss compared to the classical LoRaWan protocol. Based on the SPDS-TDMA protocol, this paper designs a cow activity data collection system, which is based on LoRa networking. And the design of hardware and software for corresponding IoT system is completed.