This paper presents two variants of an on-demand TDMA (Time Division Multiple Access) MAC protocol. These protocols are designed specifically for sensor networks. Thus, they attempt to reduce energy consumption while still providing efficient delivery of sensor data to the sinks. The two variants of the protocol presented in this paper are Busy Tone On-Demand Scheduling (BTODS) and On-Demand Scheduling (ODS). BTODS is designed for sensors capable of using non-interfering channels to transmit busy tones, while ODS is designed for single channel architectures. These protocols are designed to schedule slots for sensor-to-sink flows that do not interfere with existing flows.
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