TCP Congestion Controls

Paper Summary:

In this paper the author examines TCP (connection-oriented unicast protocol) congestion control techniques that can be used over connectionless IP networks. The paper starts with the author describing in detail why, the TCP is necessary. He states that it is because it maintains a congestion window that restraints the number of outstanding unacknowledged data packets on a network. The author points out that transmitting data devours slots in the window of the sender and the sender can send packets only as long as free slots are available. The author proceeds to discuss the different methods that can be used, their advantages and disadvantages in connectionless IP networks. The author concludes that there is still no real solution to the problem of getting the acknowledgment packets back to the sender without delay. This is why, he states, that prioritization in connectionless environments remains an open research problem in computer science.

Table of Contents:
Introduction
Thesis Statement
The Problem
The Issues with IP
Congestion Basics
TCP Congestion Control Protocols
The Multi-Rate Protocols
End-to-end Window Protocols
Partial Solutions
Conclusion

From the Paper:

"The RAP protocol machinery is mainly implemented at the source. A RAP source sends data packets with numbers and a RAP sink acknowledges each packet providing end-to-end feedback. Each acknowledgment packet contains the sequence number of the corresponding delivered data packet. Using the feed back the RAP source can detect losses and sample the round-trip-time (RTT). To design a rate adaptation mechanism, three issues must be addressed. These are the decision function, the increase/ decrease algorithm, and the decision frequency (Lynch and Rose, 1993)."

More papers on TCP Congestion Controls:

• Research Paper # 3127 : "TCP/IP Networks: Performance Improvement Issues"
• Analytical Essay # 144532 : "TCP/IP Security Vulnerabilities"
• Research Paper # 3128 : "TCP/IP Networks: Performance and Routing Issues"

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