US 9,813,983 B2
Wireless communication system, and wireless communication method in wireless communication system
Katsuhiro Hirai, Fukuoka (JP); Shinji Fukuda, Fukuoka (JP); and Takashi Yamamoto, Fukuoka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed on Sep. 15, 2015, as Appl. No. 14/854,107.
Claims priority of application No. 2014-193266 (JP), filed on Sep. 24, 2014.
Prior Publication US 2016/0088553 A1, Mar. 24, 2016
Int. Cl. H04J 3/06 (2006.01); H04W 52/02 (2009.01); H04M 11/02 (2006.01); H04N 7/18 (2006.01); H04W 84/20 (2009.01)
CPC H04W 52/0203 (2013.01) [H04M 11/025 (2013.01); H04N 7/186 (2013.01); H04W 52/0212 (2013.01); H04W 52/0235 (2013.01); H04W 84/20 (2013.01); Y02B 60/50 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A door phone system comprising:
a camera as a slave device, and
a monitor as a master device wirelessly connected to the camera,
wherein the monitor includes
a monitor wireless communicator that performs wireless communication with the camera, including receiving a captured image from the camera;
a monitor power supply that supplies power to each component of the monitor;
a monitor interrupt detector that detects various interrupts; and
a monitor controller that controls the monitor,
wherein the monitor interrupt detector supplies power from the monitor power supply to each component of the monitor when detecting an interrupt, and
wherein the monitor controller performs
control to continuously transmit a capture signal, to establish synchronization with the camera, to the camera that waits for reception at a reception timing of a first predetermined interval, via the monitor wireless communicator for a time longer than the first predetermined interval when the detected interrupt is an interrupt that requests signal transmission to the camera, and
control to wait for a capture signal for establishing synchronization transmitted from the camera through the monitor wireless communicator when the detected interrupt is a timer interrupt occurring at a second predetermined interval.