Patent ID: 9271233
Filing Date: 2016-02-23
CPC Classification: H04J,H04L,H04Q,H04W,Y02D

Claim Text:
1. A communication system including a parent station and one or a plurality of child stations, said parent station comprising: a parent station communication unit that has a reference time and communicates with said plurality of child stations; one or a plurality of parent station power control units each of which determines whether said child station should be in a power saving mode in which an apparatus is periodically partially or wholly stopped or in a normal mode in which the apparatus is operated without being partially or wholly stopped, and instructs said child station to change a mode; and one or a plurality of parent station period measurement units each of which measures a stop period in which the apparatus of the child station is partially or wholly stopped and a non-stop period in which the apparatus of the child station is not stopped in the power saving mode, and said child station comprising: a child station communication unit that performs communication while synchronizing the reference time of said parent station with a local time of said child station; a child station power control unit that changes the mode between the power saving mode and the normal mode of the child station in accordance with the mode change instruction from said parent station; and a child station period measurement unit that measures the stop period and the non-stop period of said child station, and performs a correction for one or both of the stop period and the non-stop period in the power saving mode using an error obtained by calculating a difference generated during the power saving mode between the reference time of said parent station and the local time of the child station.