Enhanced large data transmissions and catastrophic congestion avoidance over IPv6 TCP/IP networks

• US 10,432,529 B2
• Filed: 05/23/2016
• Issued: 10/01/2019
• Est. Priority Date: 09/19/2013
• Status: Active Grant

• Current Assignee: Connectivity Systems Inc.
• Original Assignee: Connectivity Systems Inc.
• Inventors: Rankin, John
• Primary Examiner(s): Choudhry, Samina F
• Application Number:
  US15/162,611
• Publication Number:
  US 20160269294A1
• Time in Patent Office: 1,226 Days
• Field of Search: 370231
• CPC Class Codes: H04L 47/12 Avoiding congestion; Recovering from congestion
• CPC Class Codes: H04L 47/193 at the transport layer, e.g. TCP related

Abstract

A system and method of reducing network congestion whereby significant improvement can be gained by the elimination of catastrophic network congestion failure within a TCP/IP network. Exemplary embodiments are implemented by an improved process for dealing with data loss related to IPv6 fragmentation, in which a ICMPv6 error message is transmitted by a destination node containing a bitmap of the unreceived datagram fragments. The sending node receives the error message and prepares only those unreceived fragments for transmission.

Claims

1. A method for avoiding congestion in a packet switched network comprising the steps of:

initializing, at a destination host, a transmission timer;

receiving, at the destination host, a first received fragment of a fragmented datagram,

wherein the fragmented datagram is fragmented into a total number of fragments comprising the first received fragment and at least one lost fragment;

starting the transmission timer upon receipt of the first received fragment;

incrementing the transmission timer; and

if the incremented transmission time is less than a transmission timeout time;

generating a fragmentation data loss error message comprising;

an identification value identifying the fragmented datagram; and

a bitmap identifying the at least one lost fragment of the fragmented datagram;

transmitting the fragmentation data loss error message to a source host;

identifying, at said source host, said at least one lost fragment from said fragmentation data loss error message;

sending, from said source host, only said at least one lost fragment to said destination host; and

receiving, at said destination host, said at least one lost fragment such that all fragments of said fragmented datagram are received before said transmission timeout time.