Time synchronization method and system using WiFi-direct

摘要

Disclosed are a time synchronization method and system using WiFi-direct. The method comprises: a master control device obtaining from a base station standard date and time information used for time synchronization; establishing a WiFi-Direct connection between the master control device and a slave device; in accordance with an active manner, the slave device obtaining a time synchronization manner or a passive reception time synchronization manner, and obtaining the standard date and time information from the master control device through the WiFi-Direct connection; and the slave device calculating an actual standard date and time with the influence of transmission time delay eliminated using the standard date and time information, and setting a system date and time thereof using the actual standard date and time. The master control device of the present invention transmits to each slave device standard date and time information obtained from a base station through Wi-Fi Direct to enable each slave device to achieve time synchronization.

主权项

1. A method for time synchronization by WiFi-direct, comprising steps of:
acquiring, by a master device, information on standard date and time from a base station for time synchronization; establishing a WiFi-direct connection between the master device and a slave device; acquiring, by the slave device, the information on the standard date and time actively or passively from the master device through the WiFi-direct connection; and acquiring, by the salve device, actual standard date and time by adding a transmission delay to the standard date and time, and setting local system date and time as the actual standard date and time, wherein information interaction between the master device and the slave device is based on a request-response mode, and the transmission delay is acquired by: calculating a difference between time of receiving a response to a request and time of sending the request; and then dividing the difference by 2.