Patent ID: 8305946
Filing Date: 2012-11-06
Classification: H04L,H04W,Y02D

Abstract:
1. A communication system, comprising a plurality of intermittent operation communication devices for transmitting data to a receiving communication device, which periodically repeats an intermittent operation including sleep, transmission of a reception timing announcement beacon, and either of data reception and data reception wait, each of said plurality of intermittent operation communication devices as a first communication device comprising: a data transmitter for performing transmission when data traffic designating as a destination thereof the receiving communication device is generated in the first communication device and the first communication device receives the reception timing announcement beacon from the receiving communication device; a transmission announcer for intermittently transmitting a first transmission announcement beacon while waiting for reception of the reception timing announcement beacon from the receiving communication device when the data traffic is generated; and an adjuster for monitoring, when the data traffic is generated, reception of a second transmission announcement beacon from another intermittent operation communication device as a second communication device, and permitting the data transmitter to perform transmission, wherein said adjuster, when the second transmission announcement beacon is received, places the first communication device into a sleep mode for a predetermined period of time to cause said data transmitter to delay the transmission, said transmission announcer records in the first transmission announcement beacon a first number of repetitions of transmitting the first transmission announcement beacon in connection with the generated data traffic, and the second transmission announcement beacon includes a second number of repetitions of transmitting the second transmission announcement beacon.