Video QoS Flow Mapping for Reliable Key Frame Delivery
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Solution Overview
Problem
Existing video transmission methods fail to ensure reliable and on-time delivery of key frames, leading to decoding issues and reduced user experience due to loss or delay of key frames, which are crucial for video decoding.
Innovation Solution
A method and apparatus that distinguish key frames in the service flow, providing a high QoS guarantee for their transmission, ensuring reliable and on-time delivery through specific QoS flow mapping and differentiated QoS guarantees for different video frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all coded frames are transmitted in a same QoS flow, then transmission simplicity is maintained, but key frame delivery reliability deteriorates
Solution Approach 1:
The patent segments the video service flow into multiple QoS flows based on frame types. Key frames are transmitted in a first QoS flow with high reliability guarantees, while non-key frames are transmitted in a second QoS flow with different QoS parameters. This segmentation resolves the contradiction by differentiating transmission requirements for different frame types, ensuring key frame reliability without requiring all frames to use complex differentiated transmission from the outset.
Solution Approach 2:
The patent applies local quality by assigning different QoS characteristics to different parts of the video stream. Specifically, key frames receive enhanced QoS treatment (higher priority, reliability guarantees) while non-key frames use standard QoS. This localized differentiation ensures that only the critical key frames get the special treatment needed for reliable delivery, rather than applying complex QoS management to all frames uniformly.
2Device complexity
If all coded frames are transmitted in a same QoS flow, then system complexity is reduced, but decoding reliability deteriorates due to key frame loss
Solution Approach 1:
The patent divides the video traffic into separate QoS flows based on frame importance. By segmenting key frames into a dedicated high-reliability QoS flow, the system ensures decoding reliability without requiring complex QoS management for all frames. The segmentation allows the network to focus resources on protecting the critical key frames that are essential for decoding.
Solution Approach 2:
The patent performs preliminary classification of video frames into key and non-key categories before transmission. This preliminary action allows the network to pre-allocate appropriate QoS resources for each frame type, ensuring that key frames are protected with sufficient reliability guarantees before transmission begins, thereby preventing decoding failures.
3Reliability
If key frame transmission is guaranteed with high QoS, then decoding reliability is improved, but transmission system complexity increases
Solution Approach 1:
The patent segments video frames into key and non-key categories with distinct QoS requirements. This segmentation enables the network to implement differentiated QoS management only where necessary (for key frames) while using standard management for non-key frames, thus improving key frame delivery reliability without proportionally increasing overall system complexity.
Solution Approach 2:
The patent applies differentiated QoS management locally to key frames rather than universally to all frames. By confining the complex QoS management mechanisms (priority scheduling, reliability guarantees) to only the critical key frames, the system achieves high decoding reliability while minimizing the overall complexity burden on the transmission system.
Data Source
AI summary
A method and device for video transmission are disclosed. A session management function (SMF) receives a policy and charging control (PCC) rule sent by a policy control function (PCF). The PCC rule is generated by the PCF in response to determining that a transmission of a first video frame needs to be guaranteed. The PCC rule indicates that a quality of service (QoS) flow transmission with a first QoS guarantee is used for a first service flow. The first service flow includes a first video frame.