Video Encoder Scheduler for Wireless Latency Reduction
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Solution Overview
Problem
Real-time video communication in wireless networks is hindered by latency issues, particularly due to fading and I-frame collisions, which degrade the quality of experience (QoE) by causing delays in transmitting I-frames and P-frames.
Innovation Solution
A system and method that aligns the scheduler of a communications controller with a video encoder to prioritize current data transmission, coordinates multiple sources and sinks to reduce delays, and uses fractal encoding to generate P-frames and I-frames on the fly, avoiding collisions and optimizing traffic flow by selecting the appropriate frame type based on a determined video transmission schedule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If I-frames are transmitted periodically in real-time video, then random access and scene change handling are improved, but latency and I-frame collisions increase
Solution Approach 1:
The system dynamically adjusts frame transmission scheduling based on channel conditions and collision detection. The scheduler modifies I-frame transmission timing adaptively rather than using fixed periodic intervals, allowing the system to maintain random access capability while avoiding latency peaks and collisions during fading periods.
Solution Approach 2:
The system implements feedback mechanisms where the scheduler monitors channel state information and collision patterns, then adjusts subsequent I-frame transmission schedules accordingly. This feedback loop enables the system to respond to actual channel conditions and prevent I-frame collisions while maintaining reliable random access points.
2Loss of time
If I-frames are pushed quickly to reduce latency, then quality of experience is improved, but I-frame collisions and fading-related delays increase
Solution Approach 1:
The scheduler performs preliminary actions by predicting favorable channel periods for I-frame transmission based on historical channel state information. By proactively scheduling I-frames during predicted good channel conditions rather than reacting to collisions after they occur, the system reduces latency while maintaining reliable collision-free transmission.
Solution Approach 2:
The system implements mechanisms to skip unfavorable transmission periods and rush I-frame transmission through favorable channel windows. When channel conditions deteriorate or collisions are detected, the scheduler skips those periods and accelerates I-frame transmission during identified favorable windows, reducing overall latency while avoiding collisions.
3Productivity
If a communications controller handles both uplink and downlink I-frames simultaneously, then resource utilization is improved, but scheduling complexity and collisions increase
Solution Approach 1:
The system segments the scheduling of uplink and downlink I-frames into separate handling mechanisms while maintaining overall coordination. By dividing the complex simultaneous scheduling task into manageable segments with dedicated scheduling logic for each direction, the controller maintains high resource utilization while reducing scheduling complexity and preventing collisions through structured separation.
Data Source
AI summary
In one embodiment, method for transmitting video includes determining a first video transmission schedule and selecting one frame type of a plurality of frame types to produce a selected encoded frame in accordance with the first video transmission schedule. The method also includes transmitting, by a first device to a second device, the selected encoded.