WFD Metadata Multiplexing for Wireless Display Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless display transmission technologies, such as Miracast, lack efficient methods for transmitting metadata, which limits user experience by not providing essential information like battery status, content details, and wireless quality during multimedia streaming.
Innovation Solution
A method and device for transmitting metadata in WFD (WiFi Display) using a WFD source that creates a packet stream with a WFD header including metadata structure and update indicators, allowing incremental updates, and multiplexing metadata with audio or video streams as a transport stream, enabling efficient delivery of metadata to a WFD sink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If wireless display transmission technology (Miracast) is used to transmit multimedia content, then content delivery is enabled, but metadata transmission is inefficient or absent
Solution Approach 1:
The patent merges metadata transmission with the existing multimedia stream transmission by multiplexing metadata packets with audio or video packets in the same transport stream. This combining approach enables simultaneous delivery of both content and metadata through a unified channel, resolving the issue of inefficient separate metadata transmission.
Solution Approach 2:
The transport stream is designed to serve multiple functions: it carries both multimedia content (audio/video) and metadata information simultaneously. By making the transmission system universal, it can handle different types of data (content and information) through the same protocol, improving overall information delivery efficiency.
2Loss of information
If metadata is transmitted separately from multimedia streams, then metadata can be delivered, but transmission overhead and complexity increase
Solution Approach 1:
By combining metadata and multimedia streams into a single multiplexed transport stream, the system eliminates the need for separate transmission channels. This merging reduces the number of independent transmission paths and associated control mechanisms, thereby reducing system complexity while ensuring reliable metadata delivery.
3Loss of information
If full metadata is transmitted in every update, then complete information is provided, but bandwidth consumption increases
Solution Approach 1:
The metadata transmission is segmented into selective updates rather than complete re-transmissions. The system divides metadata into essential updates that are transmitted only when changed, allowing the receiver to reconstruct complete metadata information from incremental updates, thereby reducing overall data transmission volume while maintaining information completeness.
Solution Approach 2:
The metadata update mechanism is made dynamic, adapting the transmission content based on what has actually changed. Rather than static full-transmission protocols, the system dynamically determines which metadata portions need updating, optimizing bandwidth usage while ensuring the receiver obtains complete and current metadata information.
Data Source
AI summary
A method and a device for transmitting metadata in a WFD are provided. Particularly, a WFD source forms a WFD frame including a WFD header and metadata. The WFD source transmits, to a WFD sink, a packet stream created by packetizing a metadata stream including the WFD frame. The WFD header includes a metadata structure field and a metadata update indicator. The metadata structure field indicates whether the metadata has a video metadata structure or an audio metadata structure. The metadata update indicator indicates that previous metadata is updated such that all of the previous metadata is replaced with new metadata, or that the previous metadata is incrementally updated together with updated metadata.