MHP Middleware SDP Event Information Table IP Video Access
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Solution Overview
Problem
Current Digital Video Broadcasting (DVB) systems limit users to accessing event information only from terrestrial, satellite, or cable signals, preventing seamless integration and access to IP-streamed video content.
Innovation Solution
The system simulates an Event Information Table using SDP messages to link DVB services with IP-streamed services, enabling access by adding specific fields like locator, start and end times, IP address, and port to SDP messages, and introducing a switching mechanism within the MHP middleware to merge data from primary and secondary sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system uses traditional DVB SI Event Information Table structure, then compliance with DVB standard is maintained, but access to IP-streamed video content is prevented
Solution Approach 1:
The patent embeds SDP/SAP protocol data structures within the DVB SI Event Information Table framework. The SDP message parameters (session description, IP address, port information) are nested as additional descriptors within the EIT structure, allowing IP-streamed content to be accessed through the standard DVB interface while maintaining compliance with the DVB SI specification.
Solution Approach 2:
The patent introduces an intermediary layer that translates and merges SDP/SAP protocol data with DVB SI Event Information. This intermediary mechanism bridges the gap between IP-based video distribution and traditional DVB systems, allowing seamless integration without compromising either standard's integrity.
2Adaptability or versatility
If the system merges SDP/SAP information with DVB SI Event data, then access to multiple video sources is enabled, but system complexity increases
Solution Approach 1:
The patent creates a universal Event Information structure that can represent both traditional DVB broadcast content and IP-streamed content through a unified interface. The enhanced EIT structure serves multiple functions: it maintains compatibility with existing DVB clients while simultaneously supporting SDP/SAP-based IP video sources, eliminating the need for separate handling mechanisms.
3Adaptability or versatility
If the system adds multiple data sources (DVB stream and IP stream), then content availability improves, but information management complexity increases
Solution Approach 1:
The patent merges DVB Event Information Table data with SDP/SAP session description data into a unified Event structure. This combination consolidates information from multiple sources (broadcast stream parameters, IP address, port, session timing) into a single integrated data representation, improving content availability while simplifying information management through unified access.
Data Source
AI summary
The invention relates to a set-top box receiver allowing access to interactive digital TV coming from any IP-network. It makes use of the SAP/SDP protocols as a logic link between “classic” DVB services (satellite, terrestrial, cable) and IP services. The invention allows providing TV services relying on existing Internet architecture. Simulation means are provided, in the MHP middleware, for building an Event Information Table upon the SDP messages. Specific preview information is added to the SDP messages so that they can be linked to a DVB service.