In order to make the IOT (Internet of Things) sensor network wireless access the Internet,data transmission and the protocol conversion between ZigBee and internet,an IOT gateway system based on ZigBee/3G is designed.The ZigBee sensor network collects sensor data,and all data are aggregated to IOT gateway and sent to the server through the 3G network.Monitoring personnel can check all the nodes data through mobile phone and computer,and also can send commands to the sensor node through the PC software to realize the control of sensor nodes.As an example,water tank temperature information and control relay are tested by using this ZigBee network.Test results show that this system has good real-time,the packet loss rate of 0.047％,lower than the Chinese Communications Standards Association (CCSA standard) maximum packet loss rate of 1％ provisions,the average time delay of 9.62 ms,the average time delay is far less than the limit specified in CCSA standard (IPTD) 100 ms.
NETL
NSTL
维普
万方数据
