Embedding Location Data in Media Packet Payloads
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Solution Overview
Problem
Existing methods for mobile devices to share real-time location information while transmitting media data are inefficient, as they often require excessive signaling, may not support all devices, and can compromise security, especially when using Real-time Transport Control Protocol (RTCP) or Compressed RTP (cRTP) with heavy location data.
Innovation Solution
Embedding real-time location information in the payload portion of media packets, specifically within the Packetized Elementary Stream (PES) headers, using secure RTP (sRTP) and Geography Markup Language (GML) for secure and efficient transmission without involving signaling paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If location information is embedded in RTCP packets, then location information can be transmitted with media data, but many mobile devices do not support RTCP and intermediate devices may block RTCP packets
Solution Approach 1:
The patent embeds location information directly into the media packet payload rather than using RTCP, making the solution universally compatible with all mobile devices and network infrastructure that support basic media transmission, eliminating RTCP support requirements while maintaining location information transmission capability
2Loss of time
If location information is transmitted using signaling messages, then location information can be provided during setup time, but excessive signaling is required when location changes rapidly and signaling paths differ from media paths
Solution Approach 1:
The patent merges location information transmission with media data transmission by embedding location data directly into the media packet payload, eliminating the need for separate signaling paths and reducing signaling overhead while ensuring location updates travel with the media stream itself
Solution Approach 2:
The media packets serve dual functionality by carrying both media data and location information, eliminating the need for dedicated signaling messages and reducing overall network traffic while maintaining real-time location tracking capability
3Loss of information
If location information is embedded in signaling paths, then location information can be transmitted, but intermediate nodes may inadvertently disclose information compromising secrecy
Solution Approach 1:
The patent extracts location information from the signaling path and embeds it directly into the media packet payload, removing it from intermediate signaling nodes that could potentially disclose information, while ensuring it travels securely with the encrypted media stream end-to-end
4Loss of energy
If Compressed RTP (cRTP) is used to pass RTP packets over slow links, then bandwidth is optimized, but it cannot work well with RTP header extensions for location information
Solution Approach 1:
The patent moves location information from the RTP header dimension to the media packet payload dimension, allowing cRTP to compress headers efficiently while location information remains embedded in the uncompressed payload portion where it can be freely included without interfering with header compression algorithms
Data Source
AI summary
One embodiment includes a method in a mobile device, including accepting real-time location information on the location of the mobile device, and ascertaining whether real-time information is to be included. In the case it is ascertained that real-time location information is to be embedded, the method includes embedding the accepted location in a payload portion of a media packet; and sending the packets to one or more recipients. At least some of the sent packets include location information embedded in the payload portion.