Data Transfer Method

• US 20130044584A1
• Filed: 10/18/2012
• Published: 02/21/2013
• Est. Priority Date: 10/04/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: HASHIMOTO, Masanori
• Granted Patent: US 8,898,534 B2
• Time in Patent Office: Days
• US Class Current: 370/216
• CPC Class Codes: H04L 1/1642 Formats specially adapted for sequence numbers
• CPC Class Codes: H04L 1/1848 Time-out mechanisms
• CPC Class Codes: H04L 1/187 Details of sliding window management
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 2001/125 Arrangements for preventing errors in the return channel
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 36/00 Hand-off or reselection arrangements

Abstract

A data transfer method having a data retransmission function, in which a sending side saves data that was sent in memory, a receiving side uses a transmission confirmation signal to request the sending side to retransmit the data when the data was not properly received, then monitors the elapsed time, and when the data is not retransmitted after the elapsed time has exceeded a set time, uses a transmission confirmation signal again to request that the data be retransmitted, and where in response to that transmission confirmation signal, the sending side retransmits the saved data to the receiving side.

Claims

1. A data retransmit method of a data communication system in which a receiving side, after receiving data, sends a transmission confirmation signal to a sending side indicating whether or not the data was received properly, and the sending side makes reference to the transmission confirmation signal to identify that the receiving side did not proper receive the data and retransmits that data, the data retransmit method comprising:

saving at the sending side, the data sent to the receiving side;

continuing to save the data even though the sending side confirms that the data is received properly by a transmission confirmation signal corresponding to the data; and

retransmitting the saved data to the receiving side when retransmission of the data is requested from the receiving side.