TCP Selective Acknowledgment Bitmap Reduces Congestion
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Solution Overview
Problem
Current TCP/IP networks face catastrophic congestion and resource waste due to inefficient retransmission mechanisms, where a single lost packet can trigger the retransmission of an entire sequence of data, leading to non-linear expansion of traffic and packet loss.
Innovation Solution
Incorporating a bitmap in the TCP header to identify specific segments that need retransmission, allowing only lost data segments to be retransmitted, rather than the entire window, thereby regulating data flow at a granular level and reducing unnecessary retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cumulative acknowledgment mechanism is used in TCP, then reliability of data transmission is improved, but network congestion and resource waste worsen due to retransmission of entire sequence ranges
Solution Approach 1:
The patent segments the acknowledgment process by introducing selective acknowledgment (SACK) that individually acknowledges each received segment rather than acknowledging cumulative ranges. This allows the receiver to identify exactly which segments are missing, enabling the sender to retransmit only those specific segments rather than entire sequence ranges, thus reducing network resource waste while maintaining reliability
Solution Approach 2:
The patent enhances feedback mechanisms by incorporating detailed segment-level acknowledgment information in TCP packets. The SACK option provides feedback about specifically which segments have been received and which are missing, allowing the sender to make informed retransmission decisions. This granular feedback prevents unnecessary retransmissions of already-received data, reducing network congestion while preserving transmission reliability
2Reliability
If retransmission of entire sequence range is performed upon packet loss, then data completeness is improved, but network congestion expands non-linearly
Solution Approach 1:
The patent applies segmentation to the retransmission process by identifying and retransmitting only the specific missing segments rather than the entire sequence range. Using SACK information, the sender determines exactly which segments are lost and retransmits only those, preventing non-linear expansion of network traffic while ensuring data completeness is maintained
Solution Approach 2:
The patent implements partial action by performing retransmission only for the portion of data that is actually missing rather than the entire sequence range. This selective approach avoids the excessive action of retransmitting data that has already been successfully received, thereby controlling network traffic volume while maintaining data completeness
3Productivity
If TCP window size is increased to improve throughput, then data transfer rate is improved, but vulnerability to congestion collapse worsens
Solution Approach 1:
The patent segments the large TCP window into individually trackable segments with specific acknowledgment status. By using SACK to monitor each segment within the window, the system can identify exactly which segments are lost even in large windows, enabling precise retransmission decisions that prevent congestion collapse while maintaining high throughput
Solution Approach 2:
The patent enhances feedback mechanisms to provide detailed segment-level status information within large TCP windows. The SACK option allows the receiver to feedback information about specifically which segments within the window have been received, enabling the sender to adjust retransmission behavior appropriately and maintain congestion stability even with large window sizes
Data Source
AI summary
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 the retransmission of TCP window data. By reducing packet loss to a grid map and retransmitting only the lost pieces rather than the entire window, congestion can be eliminated. In a traditional TCP implementation, loss of packets within a specified window of data can cause the entire window of data to be retransmitted. This system and method improves this process by allowing only lost packets to be retransmitted and not properly received data that is merely part of a larger grouping that also contained lost data.