Hybrid Broadcast Signal Transmission via Websocket and PLP Segmentation
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, particularly in supporting high-definition images and additional services, especially in mobile reception and hybrid broadcasting environments.
Innovation Solution
A system is proposed that utilizes hybrid broadcasting methods combining terrestrial networks and the Internet, with app-based enhancements and specific architectures for efficient communication between devices, enabling effective delivery of information like ESG and EAS, and using protocols like MMTP and ROUTE/DASH for signaling and media transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital broadcast systems transmit large amounts of video/audio data and additional services, then service functionality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The broadcast signal is divided into multiple physical layer pipes (PLPs) that can be transmitted independently. Each PLP carries specific data streams (video, audio, or additional services), allowing selective transmission and reception. This segmentation enables efficient resource allocation and improves data transmission efficiency while maintaining service functionality.
Solution Approach 2:
The broadcast system is designed to universally support multiple service types (HD video, multichannel audio, additional data services) through a unified transmission framework. The system can adaptively allocate resources across different service types using the same infrastructure, improving overall data transmission efficiency.
2Manufacturing precision
If digital broadcast systems transmit HD images and additional services, then service quality is improved, but robustness of transmission/reception networks deteriorates
Solution Approach 1:
Different robustness levels are applied to different PLPs based on their content requirements. Critical services (audio, essential video data) use more robust modulation and coding schemes, while less critical additional services use less robust but more efficient schemes. This local quality approach maintains service quality while improving overall network robustness.
Solution Approach 2:
Forward error correction (FEC) codes are applied to protect against transmission errors before data reception. The system incorporates redundancy in the form of error correction codes that can recover from errors without requiring retransmission, thereby maintaining service quality and improving robustness simultaneously.
3Adaptability or versatility
If digital broadcast systems support mobile reception equipment, then network flexibility is improved, but robustness of transmission/reception networks deteriorates
Solution Approach 1:
The system dynamically adjusts transmission parameters (modulation order, coding rate, PLP configuration) based on channel conditions and receiver capabilities. Mobile reception equipment can request and receive appropriately configured PLPs that match its movement characteristics and antenna capabilities, improving network flexibility while maintaining robustness through adaptive parameter selection.
Data Source
AI summary
A method for providing a broadcast service by a primary device (PD) includes performing a discovery process with a companion device (CD) application executed in a CD, wherein the discovery process includes receiving a device description request from the CD application, transmitting a first response message, receiving, from the CD application, an application information request destined for a first URL and transmitting a second response message, wherein a header of the first response message includes the first URL, and the second response message includes a second URL used as a Websocket endpoint of the PD; establishing a Websocket connection between a Websocket server and the CD application using the second URL; receiving a request message for media timeline information from the CD through the Websocket connection; and delivering a notification message to the CD through the Websocket connection.