Digital Transport Stream Layout for Robust Mobile Broadcast Data
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Solution Overview
Problem
The existing digital broadcast standards, such as the ATSC-MH standard, face limitations in transmitting mobile data due to inefficient stream configuration, which affects transmission efficiency and reception performance, especially in mobile devices where error robustness is crucial.
Innovation Solution
A digital broadcast transmitter and receiver system that configures a transport stream by placing mobile data in part of the packets allocated to normal data, allowing for diverse transmission efficiency and improved reception performance through encoding, interleaving, trellis encoding, and multiplexing with a sync signal, while also inserting known data for error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile data is placed only in packets allocated to mobile data according to ATSC-MH standard, then error robustness is improved, but transmission efficiency deteriorates due to inability to utilize normal data packets
Solution Approach 1:
The patent applies universality by enabling normal data packets to serve dual purposes: carrying both normal data and mobile data. The transport stream configuration allows normal data packets to be utilized for mobile data transmission in addition to their original function, thereby improving transmission efficiency without compromising error robustness through proper packet allocation and known data insertion.
Solution Approach 2:
The patent segments the transport stream into different packet types (normal data packets and mobile data packets) and assigns specific functions to each. By dividing the data stream and using segmentation indicators, the system can efficiently manage which packets carry mobile data versus normal data, optimizing both reliability and transmission efficiency.
2Device complexity
If known data is not placed in area B of interleaved mobile data, then mobile data transmission is simplified, but area B becomes susceptible to errors
Solution Approach 1:
The patent applies preliminary action by inserting known data into area B of the interleaved mobile data stream before transmission. This pre-insertion of known data sequences enables the receiver to perform accurate synchronization, equalization, and error correction, thereby improving reliability in the previously vulnerable area B without significantly increasing system complexity.
3Reliability
If packets allocated to normal data are not used for mobile data, then normal data transmission is ensured, but mobile data transmission efficiency is limited
Solution Approach 1:
The patent applies dynamics by implementing flexible and adaptive packet allocation where normal data packets can dynamically serve mobile data transmission needs when appropriate. The system can adaptively assign normal data packets to carry mobile data based on traffic conditions and requirements, allowing the transport stream configuration to be dynamic rather than static, thereby improving mobile data transmission efficiency while maintaining normal data reliability.
Data Source
AI summary
A method for processing a stream of a digital broadcast receiver is provided. The method which processes a stream that is divided into a first area allocated to first mobile data and a second area allocated to normal data, includes: receiving a transport stream including second mobile data in at least a part of the second area separately from the first mobile data, demodulating the transport stream, equalizing the demodulated transport stream, and decoding at least one of the first mobile data and the second mobile data from the equalized transport stream. Accordingly, mobile data services may be provided in various ways.