Abstract
A wireless sensor-actuator network (WSAN) is composed of sensor and actuator nodes interconnected in a wireless channel. Sensor nodes can deliver messages to only nearer nodes due to weak radio and messages are forwarded by sensor nodes to an actuator node. Messages sent by nodes might be lost due to collision and noise. We discuss the redundant data transmission (RT) protocol to reduce the loss of sensed values sent to an actuator node even if messages are lost. In the RT protocol, a sensor node sends a message with not only its sensed value but also sensed values received from other sensor nodes. Even if a message with a sensed value v from a sensor node is lost, an actuator node can take the value v from other messages. We evaluate the RT protocol compared with the CSMA protocol in terms of how much sensed values an actuator node can receive in presence of message loss.
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