Broadcast Signal Data Pipe Interleaving for Emergency Alert 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 need to support future hybrid broadcasting technologies using terrestrial networks and the Internet.
Innovation Solution
A system that processes data based on service characteristics to control quality of service (QoS) and enables flexible transmission of broadcast services through a single radio frequency (RF) signal bandwidth, using protocols like MMTP, ROUTE, and DASH for efficient transmission and reception of digital broadcast signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signals transmit large amounts of video/audio data and additional data, then service quality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The broadcast data stream is segmented into multiple transport packets with structured formatting. Each packet contains specific fields (sync byte, transport error indicator, adaptation field, payload) that enable efficient processing and error handling, allowing large amounts of data to be transmitted systematically without overwhelming the transmission channel.
Solution Approach 2:
The system employs variable parameter structures in the data packets, including optional adaptation fields and configurable payload types. This allows the transmission format to be dynamically adjusted based on service requirements, optimizing transmission efficiency while accommodating different amounts of video/audio data and additional services.
2Adaptability or versatility
If digital broadcast signals include various types of additional data, then service functionality is improved, but transmission robustness deteriorates
Solution Approach 1:
The patent introduces intermediary structures including adaptation fields and transport error indicators that mediate between the diverse additional data and the transmission channel. These intermediaries provide error detection, synchronization, and structured formatting that protect the integrity of various data types during transmission, maintaining robustness while supporting service functionality.
Solution Approach 2:
The system incorporates error protection mechanisms in advance within the packet structure. Transport error indicators and adaptation fields are built into each packet before transmission, providing preemptive error detection and handling capabilities that protect against data corruption when transmitting vulnerable additional service data.
3Adaptability or versatility
If the system supports mobile reception equipment, then network flexibility is improved, but reception reliability deteriorates
Solution Approach 1:
The patent implements dynamic packet structures with configurable fields that can adapt to different reception conditions. The adaptation fields and variable payload structures allow the system to adjust transmission parameters based on mobile reception conditions, providing flexibility for different devices while maintaining reliability through error indicators and structured formatting that work across varying channel conditions.
Data Source
AI summary
A method of processing a broadcast signal includes physical layer processing a plurality of packets into a plurality of data pipes to form a signal frame of the broadcast signal. Further, a packet includes an emergency alert message for an emergency alert service so that a data pipe carries the emergency alert massage, the emergency alert message including a message identifier (ID) for identifying the emergency alert message and a service ID identifying a service related to the emergency alert message. The physical layer processing further includes encoding data in each data pipe; bit interleaving the encoded data in each data pipe; and time interleaving the bit interleaved data in each data pipe according to a first mode or a second mode, the first mode represents that the time interleaving is performed based on convolutional interleaving operation, the second mode represents that the time interleaving is performed based on a combination of block interleaving operation and convolutional interleaving operation; and transmitting the broadcast signal. In addition, the broadcast signal further includes physical layer signaling information, the physical layer signaling information including a signaling information representing that the data pipe carries the emergency alert message and time interleaving signaling information related to the first mode and the second mode.