Dynamic FEC Redundancy Control for Moving Image Transmission
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Solution Overview
Problem
Moving image transmission apparatuses face challenges in determining adequate packet redundancy based on the correlation between encoding bit rate and packet loss rate, leading to network congestion and degraded image quality, especially in unstable network conditions.
Innovation Solution
A quality control system that includes a state information receiving unit, a state information record storing apparatus, and a moving image quality control unit to estimate the correlation between encoding bit rate and packet loss rate, determining optimal packet loss rate and redundancy to maximize encoding bit rate, thereby adjusting transmission bit rate and FEC redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FEC redundancy is increased to compensate for packet loss, then packet loss compensation improves, but network bandwidth consumption increases excessively
Solution Approach 1:
The patent applies dynamics by making FEC redundancy variable rather than fixed. The redundancy level is dynamically adjusted based on real-time network conditions (packet loss rate, available bandwidth), allowing the system to optimize between reliability and bandwidth consumption. When network conditions are good, redundancy is reduced; when packet loss increases, redundancy is increased accordingly.
Solution Approach 2:
The patent changes the parameter of FEC redundancy from a static value to a dynamic value that adapts to network conditions. By monitoring packet loss rates and available bandwidth, the system adjusts the redundancy parameter in real-time, transforming a fixed-parameter system into one that optimizes performance based on actual network state.
2Reliability
If retransmission is used to improve immunity against packet loss, then packet loss compensation improves, but latency increases
Solution Approach 1:
The patent uses feedback mechanisms where the receiving apparatus reports packet loss rates and network conditions back to the transmitting apparatus. This feedback enables the transmitter to adjust FEC redundancy levels dynamically, allowing for more efficient packet loss compensation without relying on time-consuming retransmissions, thus reducing latency while maintaining reliability.
3Ease of manufacture
If fixed FEC redundancy is used, then implementation simplicity improves, but adaptability to network conditions deteriorates
Solution Approach 1:
The patent transitions from static to dynamic FEC redundancy, making the system adaptable to changing network conditions. The dynamic adjustment mechanism maintains relative implementation simplicity while significantly improving adaptability, as the system automatically responds to network changes without requiring complex manual configuration.
4Reliability
If excessive redundancy is assigned to data, then packet loss compensation improves, but network bandwidth utilization efficiency deteriorates
Solution Approach 1:
The patent optimizes the redundancy parameter by adjusting it based on actual network conditions rather than using excessive fixed redundancy. By monitoring packet loss rates and available bandwidth, the system changes the redundancy parameter to match actual needs, improving both reliability and bandwidth utilization efficiency simultaneously.
Solution Approach 2:
The patent applies partial action by using only the necessary amount of redundancy rather than excessive redundancy. The system calculates the minimum required redundancy based on observed packet loss rates and network conditions, avoiding the waste of bandwidth that would result from always using maximum redundancy levels.
Data Source
AI summary
A moving image transmission system determines adequate number of packets, which are corresponding to redundant portion, in accordance with a network state.The moving image transmission system estimates a correlation between a transmission bit rate and a packet loss rate based on both of information which indicates the packet loss rate and bit rate information, and determines the packet loss rate, which makes an encode bit rate of moving image data maximum, based on the correlation, and determines redundancy, which is applied to the moving image data, based on the determined packet loss.