Control Message Insertion in DVB-H Data Bursts
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Solution Overview
Problem
DVB-H mobile equipment faces synchronization issues between bursts of different services due to unsynchronized control messages, leading to decryption failures during service transitions or interruptions.
Innovation Solution
A method where control messages are stored and inserted into each burst of service content, ensuring continuous decryption by associating bursts with relevant control messages, which are placed at the beginning of the burst, allowing immediate decryption upon receipt and storing additional control words for subsequent bursts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If control messages are transmitted independently without synchronization with content bursts, then transmission simplicity is maintained, but decryption reliability deteriorates during service transitions
Solution Approach 1:
The control message is inserted at the beginning of each content burst before the encrypted data, so that when the mobile equipment receives a burst, the control message is already available for immediate decryption. This preliminary placement ensures that control messages are synchronized with content bursts, solving the reliability issue during service transitions without complicating the transmission structure.
2Use of energy by moving object
If the receiver waits for control messages to arrive before decrypting content, then energy consumption is reduced by keeping receiver in standby, but decryption reliability deteriorates during rapid service changes
Solution Approach 1:
The control message is positioned at the beginning of each burst, allowing the receiver to decrypt content immediately upon receiving the burst without waiting for subsequent control messages. This enables the receiver to stay in standby mode between bursts (saving energy) while ensuring reliable decryption during rapid service changes because the control message is already prepared at the burst start.
3Reliability
If control messages are transmitted continuously to ensure synchronization, then decryption reliability is improved, but energy consumption increases due to continuous receiver activation
Solution Approach 1:
Instead of transmitting control messages continuously, the system inserts control messages at the beginning of each content burst. This allows the receiver to remain in standby mode between bursts (reducing energy consumption) while still ensuring reliable decryption, as the control message is already positioned at the burst start for immediate use.
Solution Approach 2:
The control message transmission is merged with the content burst transmission. Rather than sending control messages separately and continuously, the control message is combined with the content burst by placing it at the beginning of the burst, achieving both reliability and energy efficiency simultaneously.
Data Source
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AI summary
The invention concerns a method for transmitting a flow of digital data and of controlled messages associated with said flow addressed to mobile terminals. The flow comprises successive bursts of data of encrypted contents with control words included in the control messages transmitted in parallel with said flow. The method is characterized in that it consists in inserting a control message in each transmitted burst of contents, said message containing at least one control word designed to decrypt the contents of said burst.