Data collection system, data collection device, wireless communication device, and communication method for collecting data

摘要

A wireless communication device in a data collection system starts measuring a time when the wireless communication device receives a wireless signal from a data collection device. The wireless communication device changes the wireless channel, transmits a detection signal for detecting the data collection device, and starts measuring a time after transmitting the detection signal when the wireless communication device is unable to receive a next wireless signal from the data collection device even after passage of a predetermined time since the wireless communication device has previously received the wireless signal. The wireless communication device changes the wireless channel to be used, depending on whether the wireless communication device has received a response signal from the data collection device in response to the detection signal within a predetermined time.

主权项

1. A data collection system comprising:
a data collection device; and at least one wireless communication device configured to select one wireless channel from a plurality of wireless channels, and configured to hold a wireless communication between the data collection device and the wireless communication device, wherein the wireless communication device starts measuring a first time when the wireless communication device receives a wireless signal from the data collection device, when the wireless communication device receives another wireless signal from the data collection device before the first time exceeds a first predetermined time, the wireless communication device remains on the one wireless channel selected from the plurality of wireless channels, and when the wireless communication device does not receive another wireless signal from the data collection device before the first time exceeds the first predetermined time:
the wireless communication device changes to another wireless channel of the plurality of wireless channels, and transmits a detection signal for detecting the data collection device and starts measuring a second time after changing to the other wireless channel,the wireless communication device determines a new channel for communication with the data collection device as the other wireless channel when the wireless communication device receives a response signal from the data collection device in response to the detection signal before the second time exceeds a second predetermined time, andthe wireless communication device changes to a further wireless channel and transmits another detection signal when the wireless communication device does not receive the response signal from the data collection device in response to the detection signal before the second time exceeds the second predetermined time.