Digital Broadcasting Mobile Service Data Encoding
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Solution Overview
Problem
The Vestigial Sideband (VSB) transmission mode used in digital broadcasting in North America and Korea is prone to performance deterioration in poor channel environments, especially when using portable or mobile receivers, requiring enhanced resistance to channel changes and noise.
Innovation Solution
A digital broadcasting system and method that involves additional encoding of mobile service data, encapsulating non-transport-stream (TS) packet format data into TS packets, and multiplexing with main service data to maintain backward compatibility and improve receiving performance, especially in mobile scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If VSB transmission mode is used for digital broadcasting, then backward compatibility with conventional systems is maintained, but receiving performance deteriorates in poor channel environments and mobile scenarios
Solution Approach 1:
The patent segments the service data into different types (main service data and mobile service data) and applies different encoding schemes to each. Mobile service data receives enhanced encoding (RS and/or turbo coding) while main service data uses conventional encoding, allowing the system to maintain compatibility for main services while improving reliability for mobile data without requiring complete system redesign
Solution Approach 2:
The patent applies different error correction coding qualities to different data streams based on their specific requirements. Mobile service data, which is more susceptible to channel errors in portable devices, receives stronger error correction (RS code rate 1/2 or turbo code), while main service data uses standard encoding, optimizing resources where needed most
2Reliability
If additional encoding is applied to mobile service data, then resistance to channel changes and noise is enhanced, but data processing complexity increases
Solution Approach 1:
The patent divides the data processing path into separate streams: main service data processing and mobile service data processing. Additional encoding (RS and/or turbo coding) is applied only to mobile service data packets, not to all data uniformly. This segmentation allows enhanced error correction where needed while avoiding unnecessary processing complexity for main service data
Solution Approach 2:
The system performs error correction encoding in advance (forward error correction) before transmission. By pre-adding redundancy codes (RS and/or turbo codes) to mobile service data, the receiving system can correct errors without requiring complex real-time processing, simplifying the overall system architecture
3Adaptability or versatility
If non-TS packet format mobile service data is encapsulated to TS packet format, then backward compatibility is maintained, but data format conversion complexity increases
Solution Approach 1:
The patent uses TS packet format as an intermediary container that bridges different data formats. Non-TS packet format mobile service data (such as IP packets) is encapsulated within TS packet frames, which are then multiplexed with main service data. This intermediary TS packet format allows seamless integration of various data formats while maintaining compatibility with conventional TS-based receiving systems
Solution Approach 2:
The TS packet format serves multiple functions: it acts as the transport container for main service data, serves as the encapsulation format for mobile service data, and provides the common interface for multiplexing different data types. This universal format reduces the need for multiple proprietary protocols and simplifies system architecture
4Productivity
If mobile service data is multiplexed with main service data, then efficient use of transmission resources is achieved, but separation and processing of data types becomes more complex
Solution Approach 1:
The patent applies different error correction coding qualities to different data streams based on their specific requirements. Mobile service data, which is more susceptible to channel errors in portable devices, receives stronger error correction (RS code rate 1/2 or turbo code), while main service data uses standard encoding, optimizing resources where needed most
Solution Approach 2:
The patent uses distinct packet identifiers (PIDs) as visual/distinguishing markers to separate different data types within the multiplexed stream. Mobile service data packets carry specific PID values that allow receiving systems to easily identify and separate them from main service data, simplifying processing despite multiplexing
Data Source
AI summary
A digital broadcasting system and a method of processing data are disclosed. Herein, additional encoding is performed on mobile service data, which are then transmitted, thereby providing robustness in the processed mobile service data, so that the mobile service data can respond more strongly against fast and frequent channel changes. The method of processing data in a transmitting system includes receiving mobile service data, encapsulating the received mobile service data to a transport stream (TS) packet, and outputting the encapsulated mobile service data as a mobile service data packet, and multiplexing a main service data packet including main service data and the encapsulated mobile service data packet, thereby transmitting the multiplexed data packets to at least one transmitter located in a remote site.