DMB Receiver Return Channel for Missing Data
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Solution Overview
Problem
In terrestrial DMB systems, the lack of a return channel for error correction leads to repeated data transmission, significantly reducing data receiving speed, especially when users are in motion and errors occur during data reception.
Innovation Solution
A DMB data reception apparatus and method that establishes a return channel between the DMB reception terminal and the broadcasting station to request and receive missing or erroneous primary DMB data, allowing for immediate retransmission and reducing the need for waiting until the next data transmission period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated data transmission is used to correct errors in terrestrial DMB systems, then data reception reliability is improved, but data receiving speed deteriorates
Solution Approach 1:
The patent establishes a return channel in advance before data transmission begins. This return channel is prepared preliminarily so that when data errors occur during transmission, the receiving terminal can immediately request retransmission through the pre-established channel rather than waiting for the next transmission period, thus resolving the contradiction between reliability and speed
Solution Approach 2:
The patent implements a feedback mechanism where the receiving terminal detects errors in received data and sends requests through the return channel for retransmission of specific erroneous data. The broadcasting station receives these feedback requests and retransmits the needed data. This feedback loop enables error correction without waiting for periodic retransmission, improving both reliability and maintaining speed
2Reliability
If data is broadcast repeatedly at predetermined intervals, then error correction capability is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent segments the error correction process into targeted retransmission of only erroneous data portions rather than repeating entire data sets. The return channel enables identification and request of specific failed data segments, allowing the broadcasting station to retransmit only those segments that need correction, thus improving transmission efficiency while maintaining error correction capability
Solution Approach 2:
Instead of performing full repeated transmission of all data at predetermined intervals, the patent applies partial action by retransmitting only the specific data portions that were received with errors. This partial retransmission approach maintains error correction capability while significantly improving transmission efficiency by avoiding redundant transmission of correctly received data
Data Source
AI summary
Disclosed is a DMB data receiving apparatus and method for improving a DMB data receiving speed. According to the DMB data receiving apparatus and method, if there are predetermined MSC data, which have not been received or received with an error when receiving MSC data by a DMB reception terminal, the DMB reception terminal can receive the predetermined MSC data through a return channel established between the DMB reception terminal and a broadcasting station. In detail, if there are predetermined MSC data, which have not been received or received with an error, the DMB reception terminal request the broadcasting station to transmit the predetermined MSC data and to allow establishment of a return channel, and then receives the predetermined MSC data through a return channel established based on the request. Therefore, when some MOT content data have not been received or received with an error, the DMB reception terminal can immediately receive the corresponding MOT content data without waiting until the next MOT data transmission period begins, thereby greatly improving the DMB data receiving speed.