Safety Training Monitoring System of Ski Resort Based on Wireless Sensor Network

Table 1

Comparison table of the wireless communication technology.

	Wi-Fi	IrDA	Bluetooth	ZigBee
Frequency	2.4 GHz	Infrared	2.4 GHz	2.4 GHz
Bandwidth	11 Mbps	4 Mbps	1 Mbps	250 kbps
Transmission distance	0–100 m	Orientation 1-2 m	0–10 m	0–75 m
Cost	High	Low	Lower	Lowest
Number of linked devices	30	2	7	65000
Specific business	Image and voice data exchange	Small mobile device	Small data exchange, such as pictures and documents	Suitable for use in the field of automatic sensor control and various embedded devices