Apparatus for high speed communication on asymmetric line

• US 6,587,435 B1
• Filed: 03/05/1999
• Issued: 07/01/2003
• Est. Priority Date: 03/05/1998
• Status: Expired due to Term

• Current Assignee: KDD Corporation (KDDI Corporation)
• Original Assignee: KDD Corporation (KDDI Corporation)
• Inventors: Hasegawa, Teruyuki, Miyake, Yutaka, Kato, Toshihiko, Hasegawa, Toru
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): Elallam, Ahmed
• Application Number:
  US09/263,792
• Time in Patent Office: 1,579 Days
• Field of Search: 370/229, 370/230, 370/235, 370/236, 370/252, 370/316, 370/352, 370/355, 370/389, 370/392, 370/412, 370/463, 370/466, 370/468, 370/473, 370/477
• US Class Current: 370/236
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/193 at the transport layer, e.g. TCP related
• CPC Class Codes: H04L 47/27 Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
• CPC Class Codes: H04L 47/283 in response to processing delays, e.g. caused by jitter or round trip time [RTT]
• CPC Class Codes: H04L 47/323 Discarding or blocking control packets, e.g. ACK packets
• CPC Class Codes: H04W 28/10 Flow control between communication endpoints
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

The apparatus 10 is set on the line between the first and second computers 1,2 which respectively communicates by a protocol, such as TCP, having a flow control. The delay between the first computer 1 and a position, at which the apparatus 10 is set, is less than the delay between the position and the second computer 2. The apparatus 10 sends and receives a packet to/from the computers 1,2. The apparatus 10 transfers to the second computer 2, a data packet sent from the first computer 1 and being larger than a maximum data amount notified by the second computer 2. The apparatus 10 transfers, to the first computer 1, a data packet sent from the second computer 2, but does not transfer, to the first computer 1, an ACK packet sent from the second computer 2. The apparatus 10 generates, instead of the second computer 2, an ACK packet for a data packet sent from the first computer 1 and then sends the ACK packet to the first computer 1. Therefore, in a case that a large delay section having exists in the line between the computers 1 and 2, it is possible to perform a high speed communication on one way by only setting one apparatus 10.

Claims

1. An apparatus for high speed communication on an asymmetric line, wherein said apparatus is set at a position on a communication line between first and second computers which respectively communicates by a communication protocol having a flow control and a transmission delay between said position and said first computer which is less than a transmission delay between said position and said second computer, further wherein said apparatus sends and receives a packet to/from said first and second computers, said apparatus comprising;

means for generating, instead of said second computer, an ACK packet in response to a data packet sent from said first computer,

means for managing information regarding a connection between said first and second computers and a SYN packet and a SYN+ACK packet by obtaining and recording said information,

means for storing a FIN packet,

buffer means for storing said data packet sent from said first computer,

means for transferring to said second computer a data packet which is sent from said first computer and of which the data amount is larger than an amount which notified by said second computer as a maximum amount of TCP window size by which said second computer can receive, for transferring to said first computer a data packet sent from said second computer, and for not transferring to said first computer an ACK packet sent from said second computer,

wherein a high speed communication from said first computer to said secon computer is performed.

2. The apparatus claimed in claim 1, said communication protocol being the TCP protocol.

3. The apparatus of claim 1, wherein said information management means deletes said recorded information after disconnecting said connection.

4. The apparatus claimed in claim 1, wherein said FIN packet storing means transfers said stored FIN packet after a termination of data transfer.

5. The apparatus claimed in claim 1, 2, 3, or 4, said first computer being connected with the Internet, a satellite communication line being included in a line from said first computer to said second computer, and a transmission delay of a line from said second computer to said first computer being less than a transmission delay of said satellite communication line.