ATSC Receiver Dispatch Channel Wake-Sleep Control
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Solution Overview
Problem
Existing ATSC broadcast systems lack efficient mechanisms for processing and delivering targeted dispatch messages, such as emergency notifications, while conserving battery life in mobile devices and ensuring robust transmission in challenging environments.
Innovation Solution
An ATSC receiver with a controller that analyzes a low-level signaling table to determine the mode of operation, entering a sleep mode when no changes are detected and activating an emergency mode upon detecting a change, thereby ignoring non-targeted messages and conserving battery life while processing intended dispatch messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ATSC receiver continuously monitors and processes all dispatch messages in the broadcast signal, then no dispatch messages are missed, but battery life is rapidly depleted
Solution Approach 1:
The receiver dynamically adjusts its operational state based on LLS table version changes. When the version changes, the receiver transitions to an active state to process dispatch messages. When the version remains unchanged, the receiver transitions to a sleep mode to conserve battery power. This dynamic state adjustment resolves the contradiction between maintaining reliable message reception and reducing energy consumption.
Solution Approach 2:
The receiver periodically checks the LLS table version number at predetermined intervals rather than continuously monitoring all dispatch messages. This periodic checking mechanism allows the receiver to stay informed about potential message updates while spending most time in a low-power state, thus resolving the contradiction between reliable message reception and battery conservation.
2Reliability
If the ATSC receiver processes all dispatch messages regardless of targeting, then no intended messages are missed, but processing time and computational resources are wasted on non-targeted messages
Solution Approach 1:
The receiver extracts and processes only the essential LLS table version information from the broadcast signal, rather than processing all dispatch message content. By taking out only the version number for comparison, the receiver can efficiently determine whether to activate full message processing, thus reducing time loss while maintaining reliable detection of intended messages.
Solution Approach 2:
The receiver performs preliminary checking of the LLS table version number before committing to full dispatch message processing. This preliminary action allows the receiver to quickly filter out periods when no new messages are present, saving computational time and resources while ensuring that intended messages are promptly detected when they do appear.
3Use of energy by moving object
If the ATSC receiver enters sleep mode to conserve battery, then energy consumption is reduced, but the receiver may miss dispatch messages
Solution Approach 1:
The receiver uses the LLS table version number as a feedback mechanism to determine when to wake from sleep mode. By continuously monitoring this version indicator, the receiver can reliably detect when new dispatch messages are present and activate only when necessary, thus maintaining reception reliability while maximizing battery conservation during idle periods.
Solution Approach 2:
The broadcast system performs preliminary action by embedding the LLS table version information in the broadcast signal before the receiver needs to check for messages. This allows the receiver to efficiently wake up, check the version number, and determine message presence without needing to continuously process the full broadcast signal, thereby maintaining reliability while conserving energy.
Data Source
AI summary
Operations of an Advanced Television Systems Committee (ATSC) receiver include receiving an ATSC broadcast signal, the ATSC broadcast signal including signaling characterizing content of a plurality of channels, wherein a dispatch channel includes dispatch messages. The operations include analyzing a low level signaling (LLS) table for the dispatch channel to determine whether a dispatch message has been added to the ATSC broadcast signal and selecting a mode of operation based on the analyzing. The modes of operation include a sleep mode if a version of the LLS table for the dispatch channel has not changed and a dispatch mode in response to detecting a change in the version of the LLS table. In the dispatch mode, dispatch messages not destined for the ATSC receiver are ignored and an emergency operation is actuated in response determining that a particular dispatch message is destined for the ATSC receiver.