Patent ID: 8638677

Claim:
A data transferring method, wherein, a data transmitting wireless terminal validates an Acknowledgement (Ack) request data provided within a wireless data frame and transmits the wireless data frame; a data receiving wireless terminal determines whether or not a frame identifier data indicating a sequence of each Ack request data provided in the wireless data frame received from the data transmitting wireless terminal is an expected one and whether or not a present Ack request data receiving interval is longer than a last Ack request data receiving interval, and decreases a redundant predetermined number of transmission frequency of each Ack data in response to each Ack request data in case that the frame identifier data is found to be an expected one and the present Ack request data receiving interval is found to be longer than the last Ack request data receiving interval, or increases the redundant predetermined number of transmission frequency either in case that the frame identifier data is found to be not an expected one or in case that the present Ack request data receiving interval is found to be not longer than the last Ack request data receiving interval while updating the Ack request data receiving interval to the present interval in either case; and the data transmitting wireless terminal extends or shortens a cycle for transmitting the Ack request data respectively depending on whether or not the Ack data in response to the Ack request data has been received within a fixed time during the cycle.