Dynamic MPDU Dispatching Across Multiple Links for Video Recovery
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Solution Overview
Problem
Video streaming over wireless networks faces challenges due to unpredictable radio channels, leading to high data rate and low latency requirements, and conventional video packet transmission methods fail to effectively handle packet loss, resulting in degraded video quality.
Innovation Solution
A method for dynamic dispatching of MAC protocol data units (MPDUs) across multiple links, where the sequence numbers of MPDUs within each physical protocol data unit (PPDU) are non-sequential, allowing for adaptive transmission scheduling based on link conditions, and prioritizing MPDUs based on video slice importance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video data is transmitted through wireless networks using conventional packet transmission methods, then the transmission process is simple, but packet loss occurs leading to degraded video quality
Solution Approach 1:
The patent segments video data into different priority levels (high priority and low priority video data) and transmits them through different links. High priority video data is transmitted through a first link while low priority video data is transmitted through a second link, allowing selective recovery of critical video blocks even when some packets are lost
Solution Approach 2:
The patent changes the transmission parameter by using non-sequential sequence numbers for MPDUs within each PPDU. This allows the receiver to identify and recover high priority video data without requiring consecutive packets, improving reliability under packet loss conditions
2Reliability
If consecutive video blocks are lost, then video transmission simplicity is maintained, but video blocks cannot be successfully decoded or recovered
Solution Approach 1:
The patent divides video data into high priority and low priority segments, where high priority video data is transmitted in a first link and low priority video data in a second link. This segmentation ensures that critical video blocks can be recovered even when consecutive packets are lost, as the high priority segments can be retrieved from the first link
Solution Approach 2:
The patent introduces an intermediary mechanism where the transmitter sends video data through multiple links with different priority levels. The receiver uses this multi-link structure as an intermediary to recover lost video blocks by selecting high priority data from the first link, avoiding the need for complex retransmission protocols
3Manufacturing precision
If video data is transmitted without priority-based dispatching, then transmission protocol simplicity is maintained, but video quality degrades due to packet loss
Solution Approach 1:
The patent applies local quality by assigning different priorities to different parts of video data. High priority video data (critical for video quality) is transmitted through a dedicated first link, while low priority video data is transmitted through a second link, ensuring that the most important video blocks receive preferential treatment in terms of transmission reliability
Solution Approach 2:
The patent implements a dynamic dispatching mechanism where the transmitter can adaptively assign video data to different links based on current transmission conditions. The dispatching is not static but can respond to link quality variations, allowing the system to maintain high video quality even when transmission conditions change
Data Source
AI summary
A video transmission method for transmitting video data through a plurality of links includes when at least one predetermined condition related to the plurality of links is met, dispatching a plurality of MAC (Media Access Control) protocol data units (MPDUs) including video data to generate a plurality of physical protocol data units (PPDUs) to be transmitted through the plurality of links, the sequence numbers of a plurality of MPDUs in each PPDU are non-sequential, transmitting the plurality of PPDUs through the plurality of links.