MDDI Packet Structure Flexible Sub-Frame Lengths
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Solution Overview
Problem
Current Mobile Display Digital Interface (MDDI) systems have limitations due to fixed sub-frame lengths, which lead to bandwidth wastage and increased latency when transmitting large packets, and repetitive retransmission of unchanged video packet data, necessitating improvements for more efficient data transfer and reduced power consumption.
Innovation Solution
The introduction of flexible sub-frame lengths, windowless video stream packets, and enhanced reverse encapsulation packets that combine functionality, allowing for variable packet sizes and eliminating redundant data transmission, thereby optimizing bandwidth usage and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed sub-frame length is used, then system timing is simplified, but bandwidth is wasted and latency increases for large packets
Solution Approach 1:
The patent applies dynamics by transitioning from fixed sub-frame length to variable sub-frame length. The sub-frame length is dynamically adjusted based on packet size and transmission requirements, allowing the system to optimize bandwidth usage and reduce latency for large packets while maintaining timing simplicity through controlled variability.
Solution Approach 2:
The patent changes the parameter of sub-frame length from a fixed value to a variable parameter that can be adjusted according to transmission needs. This parameter change enables the system to adapt to different packet sizes, preventing bandwidth waste and reducing latency without significantly complicating the timing mechanism.
2Device complexity
If fixed sub-frame length is used, then packet transmission is simplified, but latency increases when large packets must wait for next sub-frame
Solution Approach 1:
The system dynamically adjusts sub-frame length based on packet characteristics, allowing large packets to be transmitted within the same sub-frame without waiting for the next one. This dynamic adaptation eliminates unnecessary delays while maintaining manageable transmission complexity through algorithmic control.
Solution Approach 2:
The system performs preliminary assessment of packet size and transmission requirements before initiating data transfer. By evaluating packet characteristics in advance, the system can pre-adjust sub-frame length to accommodate large packets, preventing latency issues before they occur rather than reacting after delays happen.
3Reliability
If all video packet data is repeatedly transmitted, then data completeness is ensured, but bandwidth is wasted on unchanged fields
Solution Approach 1:
The patent extracts and transmits only the changed fields between video packets rather than repeating all fields. By identifying and extracting only the necessary changed data, the system maintains data completeness for modified parameters while significantly reducing bandwidth consumption on unchanged fields.
Solution Approach 2:
The system applies partial action by transmitting only the essential changed portions of video packet data rather than complete packets. This selective transmission approach ensures data completeness for modified fields while avoiding excessive transmission of unchanged data, optimizing the balance between reliability and bandwidth efficiency.
Data Source
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AI summary
A packet structure for a Mobile Display Digital Interface (MDDI) includes a flexible sub-frame length to efficiently transmit large packets. A windowless video stream packet avoids repetitive transmissions of video packets when some parameters are unchanged, saving bandwidth. An enhanced reverse encapsulation packet combines the feature of a separate round trip delay packet with a separate reverse encapsulation packet. A link freeze is used to halt a transmission of a data stream at any point in the transmission and resume the transmission by a host.