Broadcast Signal Link Layer Segmentation for Hybrid Transmission
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, especially in mobile and indoor environments, and are not well-suited for next-generation hybrid broadcasting that combines terrestrial networks with the Internet.
Innovation Solution
A system that processes data based on service characteristics to control quality of service (QoS) and supports next-generation hybrid broadcasting by transmitting various broadcast services through a single radio frequency (RF) signal bandwidth, using signaling schemes like Service List Table (SLT) and Service Layer Signaling (SLS) to enable error-free reception with mobile devices and in indoor environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital broadcast signals 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), each carrying different types of data (video, audio, additional services). This segmentation allows efficient transmission of large data volumes by organizing them into manageable, independently transmittable units, resolving the contradiction between comprehensive service functionality and transmission efficiency.
2Adaptability or versatility
If digital broadcast signals include various types of additional data, then service diversity is improved, but transmission robustness deteriorates
Solution Approach 1:
Different PLPs are assigned different error correction coding rates and modulation schemes according to their specific requirements. Critical data like video and audio use more robust coding, while additional services use less robust but more efficient coding. This localized optimization maintains transmission robustness for essential services while enabling diverse additional services.
3Adaptability or versatility
If the system supports mobile reception equipment, then network flexibility is improved, but reception reliability deteriorates
Solution Approach 1:
The system dynamically adjusts transmission parameters including modulation order, coding rate, and PLP configuration based on channel conditions detected from reference signals. This dynamic adaptation allows the system to maintain reliable reception for mobile devices by adjusting to varying channel quality while preserving network flexibility to support different mobility scenarios.
4Area of stationary object
If the system uses terrestrial broadcast network for hybrid broadcasting, then service coverage is improved, but transmission stability deteriorates
Solution Approach 1:
The system uses reference signals as intermediaries to characterize channel conditions between the terrestrial broadcast network and reception devices. These reference signals enable the system to detect and compensate for channel variations, maintaining transmission stability across the extended service coverage area provided by terrestrial broadcasting while preparing for hybrid operation with Internet delivery.
Data Source
AI summary
A method for transmitting a broadcast signal in a digital transmitter, includes generating transport packets of transport streams including service data; generating link layer packet including the transport packets; the link layer packet including a base header including configuration information indicating a configuration of a payload of the link layer packet, the link layer packet further including an additional header including information for segmentation or concatenation based on the configuration of the payload, and the additional header further including information representing that an optional header for a sub-stream identification identifier is present after the additional header, the link layer packet further including an optional header having the sub-stream identification identifier; generating signaling information including link mapping information between the sub-stream identifier and an IP address and an UDP port carrying a transport stream for the sub-stream identifier; generating a broadcast signal including the link layer packet and the signaling information; and transmitting the broadcast signal.