Adaptive Data Transmission Control for Long-Distance Optical Fiber Circuits
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Solution Overview
Problem
In long-distance communication systems, such as marine cable systems, existing protocols struggle to efficiently control data transmission due to large transmission line delays and low signal errors, leading to inefficient throughput and data integrity guarantees.
Innovation Solution
A communication data transmission system that monitors data loss occurrence probability and adjusts data size per send, allowing continuous data transmission without waiting for acknowledgement replies when probability is low, and restricts data size only when the probability exceeds a predetermined value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCP/IP protocol with congestion control is used in long-distance communication, then data integrity is guaranteed, but throughput declines due to large round trip latency
Solution Approach 1:
The patent applies dynamics by making the data transmission system adaptive to network conditions. The throughput improvement mechanism dynamically adjusts transmission parameters based on actual network state, allowing the system to optimize between reliability and throughput in real-time rather than using fixed conservative TCP parameters
Solution Approach 2:
The patent changes key transmission parameters including window size, timeout values, and data size per send based on measured network conditions such as round trip latency and data loss occurrence probability. This parameter adaptation allows the system to overcome the fixed parameter limitations of standard TCP/IP in long-distance scenarios
2Productivity
If TCP sends large amount of data continuously to improve throughput, then communication speed increases, but enormous amount of data must be stored temporarily in protocol stack
Solution Approach 1:
The patent uses dynamic adjustment of the transmission window size based on actual network feedback and measured conditions. Rather than pre-storing enormous amounts of data, the system dynamically determines how much data to have in flight, adjusting this window size based on round trip latency measurements and network stability, thereby reducing unnecessary buffer storage while maintaining high throughput
3Productivity
If protocol conversion is used to cope with different network characteristics, then system throughput can be held in good state, but it is impossible to perform communication control efficiently in marine cable systems
Solution Approach 1:
The patent implements self-service by enabling the transmission system to automatically monitor its own performance metrics (data loss occurrence, round trip latency) and autonomously adjust transmission parameters without requiring complex external protocol conversion or manual intervention. The system serves itself by detecting network conditions and adapting control strategies accordingly
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors network performance including data loss occurrence probability and round trip latency, then uses this feedback to adjust transmission parameters. This closed-loop control eliminates the need for complex protocol conversion by directly adapting to the actual network characteristics through measured feedback
4Reliability
If TCP performs congestion control in marine cable systems with dominant transmission line delay, then data loss protection is maintained, but throughput cannot be improved because data size is restricted
Solution Approach 1:
The patent applies dynamics by transitioning from static conservative TCP congestion control to a dynamic system that continuously measures actual data loss occurrence and adjusts transmission aggressiveness accordingly. In marine cable systems where transmission line delay dominates, the system dynamically determines that large data sizes can be sent without triggering unnecessary congestion control, thereby achieving high throughput while maintaining appropriate protection
Solution Approach 2:
The patent changes the congestion control parameters based on the specific characteristics of marine cable systems. By measuring that data loss occurrence probability is low and transmission line delay is dominant, the system adjusts parameters such as window size and data size per send to be much larger than standard TCP would allow, thereby overcoming the throughput limitation imposed by conventional congestion control in this specific medium
Data Source
AI summary
Even in a network system including a transmission line of which dominant cause of delay is a transmission line delay, controlling communication speed of the network system as a whole efficiently and suppressing the delay is made possible.A communication data transmission equipment which performs sending and receiving of data with opposite transmission equipment connected via a long-distance optical fiber circuit, includes a data sending and receiving unit which, after sending a connection establishment request to the opposite transmission equipment, sends data before arrival of an acknowledgement reply, a circuit state monitoring unit which estimates data loss occurrence probability from data loss occurrence state in sending and receiving of data with the opposite transmission equipment or acquires data loss occurrence probability which the opposite transmission equipment estimated and a unit performing controls which, until the data loss occurrence probability exceeds a predetermined value, do not restrict a data size per each sending of data, and in case the data loss occurrence probability exceeds the predetermined value, reduce the data size per each sending of data according to an increase of the data loss occurrence probability.