METHOD FOR CONTROLLING THE SLEEP TIME OF MOBILE SENSOR NODES IN AN IEEE 802.15.4 -BASED SENSOR NETWORK

摘要

The present invention relates to a method for controlling the sleep time of a mobile sensor node in an IEEE 802.15.4-based sensor network. More specifically, the invention relates to a method for controlling the sleep time of a sensor node, which makes it possible to reduce the energy consumed by the sensor node by increasing the sleep time of the sensor node in stepped fashion depending on whether there is any data to be sent or received between the sensor node and a gateway instead of having the sensor node unconditionally wake up or receive beacon messages in every send cycle of beacon messages sent from a gateway, and by maintaining the sleep time of the sensor node even when the sensor node moves to a neighbouring gateway. The method for controlling the sleep time of a sensor node according to the present invention makes it possible to reduce the energy consumed by the sensor node by increasing the sleep time of the sensor node in stepped fashion depending on whether there is any data to be sent or received between the sensor nodes and a gateway. In addition, the method for controlling the sleep time of a sensor node according to the present invention makes it possible to reduce the energy consumed by sensor nodes in a sensor network in which sensor nodes frequently move, by maintaining the sleep times of the sensor nodes even when the sensor nodes move and gain access to neighbouring gateways.