Gateway V.21 Frame Packing Threshold Strategy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing IP facsimile systems experience delays and packet loss due to the caching and packing of V.21 frame data, leading to invalidity of facsimile signals and poor resistance to network delay and jitter, as the gateway caches complete frames, causing prolonged transmission times and potential timeouts.
Innovation Solution
A method and system where a gateway demodulates and caches V.21 frame data, packing and transmitting only when a frame end signal is detected or when the cached data reaches a threshold, thereby minimizing delay and optimizing data transmission speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the gateway caches complete V.21 frames before transmission, then the quantity of IFP packages is minimized, but the transmission delay increases and may cause frame invalidity or timeout
Solution Approach 1:
The patent segments the V.21 frame transmission process into two distinct paths: complete frame caching (for short frames) and threshold-based packing ( for long frames). This segmentation allows the system to optimize for different frame lengths, reducing overall transmission delay while maintaining package efficiency where applicable.
Solution Approach 2:
The patent introduces dynamic decision-making at the gateway level, where the transmission strategy (cache complete frame vs. pack at threshold) is dynamically selected based on frame characteristics and network conditions. This dynamic approach allows adaptation to varying frame lengths and network delays, preventing timeout issues while maintaining efficiency.
2Productivity
If the gateway waits for complete frame reception before packing, then packing efficiency is improved, but the system's resistance to network jitter and delay deteriorates
Solution Approach 1:
The patent applies partial action by packing frames at a threshold level rather than waiting for complete frame reception. This partial packing approach triggers transmission earlier in the reception process, reducing the waiting time and improving resistance to network jitter while still maintaining reasonable packing efficiency.
Solution Approach 2:
The patent performs preliminary packing action at the threshold point during frame reception, rather than waiting until the frame is completely received. This preliminary action initiates the packing and transmission process earlier, reducing overall delay and improving system reliability against network variations.
3Reliability
If V.21 frame data is packed into IFP packages with standard headers, then protocol compliance is maintained, but network bandwidth is consumed by extra header overhead
Solution Approach 1:
The patent changes the packaging parameters by introducing a threshold-based packing strategy that optimizes the balance between protocol compliance and bandwidth efficiency. By adjusting when packing occurs (at threshold vs. complete frame), the system can adapt to network conditions and minimize header overhead impact while maintaining T.38 protocol compliance.
Data Source
Figure 1~2
Figure 3~5
Figure 6
AI summary
The present invention discloses a system and a method for transmitting facsimile data over a network and an apparatus and a method for packing data so that cached data is packed and transmitted and the buffer is dumped when the amount of data received and cached by a gateway from a Public Switch Telephone Network (PSTN) reaches a threshold value. Then, the gateway continues receiving data from the PSTN and comparing the cached amount of data with the threshold. When the gateway detects a frame end signal, if there is already data cached in the buffer area, the gateway packs and transmits all data in the buffer and packs and transmits the frame end signal no matter whether the amount of data in the buffer has reached the threshold value; if there is no data cached in buffer area, the gateway directly packs and transmits the frame end signal. As the maximum amount of data that a data package can carry is limited, the delay due to packing and caching data by the uplink gateway is limited. This assures that V.21 frame signal data is transmitted to the correct receiving fax machine in time.