TCP-over-TCP Tunneling with Dynamic RTO and Stream Redirection
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Solution Overview
Problem
TCP over TCP connections experience network congestion issues due to mismatched RTO timers and head of line blocking, leading to inefficient retransmissions and network traffic disruptions.
Innovation Solution
Establishing multiple tunneled network connections between devices and employing a reset flag or other mechanisms to manage congestion, allowing for the redirection of application data streams to alleviate congestion and maintain session continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TCP uses adaptive timeout for determining packet loss, then packet loss detection accuracy is improved, but network congestion increases due to inappropriate retransmissions
Solution Approach 1:
The patent implements dynamic RTO adjustment by allowing the receiving device to send RTO adjustment indicators to the sending device. The sending device then adjusts its retransmission timeout based on current network conditions and receiving device buffer status, making the timeout adaptive rather than fixed. This dynamic adjustment prevents both premature retransmissions (which cause congestion) and delayed retransmissions (which reduce throughput).
Solution Approach 2:
The patent introduces a feedback mechanism where the receiving device monitors its buffer status and sends RTO adjustment indicators back to the sending device. This feedback loop allows the sending device to adjust its retransmission timing based on real-time receiving conditions, optimizing the balance between packet loss detection accuracy and network congestion prevention.
2Object-affected harmful factors
If multiple TCP connections are established for TCP over TCP traffic, then network congestion is alleviated, but device complexity increases
Solution Approach 1:
The patent segments the single TCP over TCP connection into multiple independent TCP connections. Each connection handles a portion of the tunneling traffic, distributing the load and preventing any single connection from becoming a congestion bottleneck. The sending and receiving devices maintain multiple parallel TCP connections instead of relying on a single connection for all tunneled traffic.
Solution Approach 2:
The patent combines multiple TCP connections to handle TCP over TCP traffic simultaneously. By merging the capacity of multiple connections, the system achieves higher overall throughput and better congestion resistance than a single connection could provide, while the connections work together as a unified tunneling mechanism.
Data Source
AI summary
A system, apparatus, and method for managing TCP over TCP communications using multiple TCP network connections. A plurality of tunneled network connections may be established between network devices. The network devices may employ one of the tunneled network connections over which to establish a plurality of application sessions. If congestion is detected on the employed tunneled network connection that exceeds a threshold, then a reset flag may be sent to abort that tunneled network connection. At least some of the application sessions are also transferred to another one of plurality of tunneled network connections, without terminating the moved application sessions. In one embodiment, at least one more tunneled network connection may be established between the network devices.