Patent ID: 8976810
Filing Date: 2015-03-10
Classification: H04B,H04W,Y02D

Abstract:
1. A wireless communication system in which wireless communication can be performed via a wireless communication network, the wireless communication system comprising: a wireless access point device configured to operate by using power supplied via a two-wire cable, to perform wireless communication with wireless field devices via the wireless communication network, and to perform communication via the two-wire cable; and a conversion device connected to the two-wire cable and to a control unit configured to control the wireless field devices, the conversion device being configured to supply power to the wireless access point device via the two-wire cable, and to perform conversions between signals, which are input and output from the control unit, and signals, which are transmitted and received via the two-wire cable, wherein: the conversion device is configured to transmit to the wireless access point device via the two-wire cable first time data that shows the time when a synchronization signal to the wireless access point device was delivered to the two-wire cable, and second time data that shows the time when the synchronization signal from the wireless access point device that was transmitted via the two-wire cable was received; and the wireless access point device is configured to correct times managed by itself by using the time when the synchronization signal from the conversion device that was transmitted via the two-wire cable was received, the time when the synchronization signal to the conversion device was delivered to the two-wire cable, and the times shown by the first time data and second time data.