Tele-Sentient is trying to maximize the communication distance in order to make wireless communication suitable for outdoor sensing systems.<\/p>\n\n\n\n
It is possible to set up a relay node and use a node as a relay node to extend the communication distance by multi-hop, but in order to relay at any time, the relay node must be awake at all times.<\/p>\n\n\n\n
This causes problems such as cost and power consumption, variation in data transfer time, and unpredictable delay. <\/p>\n\n\n\n
Therefore, Tele-Sentient does not use a relay node.<\/p>\n\n\n\n
Sensor node (Sensor-Mate) communicates directly to collection node (Sensor-Gateway).<\/p>\n\n\n\n
Therefore, maximizing the communication distance of the sensor node is the key to determining the range of application of the sensing system.<\/p>\n\n\n\n
The wireless interface built into the Sensor-Mate uses the carrier frequency of the UHF band (920MHz band, 400MHz band, or lower).<\/p>\n\n\n\n
In Tele-Sentient, in order to increase the communication distance, it is possible to secure the communication distance by lowering the data transfer rate according to the installation distance of Sensor-Mate and Sensor-Gateway.<\/p>\n\n\n\n
By using the Sub-GHz band and changing the transfer rate, it is possible to build a wide area network outdoors.<\/p>\n\n\n\n
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