DVB-T2 Receiver L1-Pre Signaling for Emergency Alert Processing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing Emergency Warning System in the DVB-T2 standard requires longer processing times and higher power consumption to disseminate emergency alert information, as it relies on system-on-chip activation for signal analysis, which is inefficient and power-intensive.
Innovation Solution
The implementation of L1-pre signaling and P1 signaling transmission methods, where emergency warning notification information is placed in reserved bits within the T2 frame, allowing the receiver to monitor and activate the system only when necessary, reducing power consumption and accelerating processing speed by demodulating P1 and P2 symbols before the system-on-chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the system-on-chip is activated continuously to monitor emergency warning information in the DVB-T2 standard, then the processing speed of emergency alert information is improved, but the power consumption increases significantly
Solution Approach 1:
The emergency warning notification information is embedded in the L1-pre signaling, which is transmitted and processed before the main data reception. This allows the receiver to detect emergency warnings in advance and activate the system-on-chip only when necessary, rather than keeping it continuously activated. The L1-pre signaling contains a specific field that can indicate emergency warning presence, enabling preliminary detection and selective activation.
Solution Approach 2:
The system transitions from a static state of continuous system-on-chip activation to a dynamic state where activation is adjusted based on detected emergency warning conditions. The receiver can switch between low-power mode (when no emergency is detected) and high-performance mode (when emergency warning is detected in L1-pre signaling), optimizing the balance between processing speed and power consumption.
2Reliability
If the system-on-chip is activated continuously to ensure reliable emergency warning detection, then the reliability of emergency alert reception is improved, but the power consumption increases
Solution Approach 1:
The L1-pre signaling acts as an intermediary layer between the transmitted emergency warning data and the system-on-chip processing. This intermediate signaling mechanism allows the receiver to screen for emergency conditions before engaging the power-intensive system-on-chip, maintaining reliable detection capability while reducing unnecessary activation. The L1-pre signaling contains sufficient information to indicate emergency presence without requiring full system-on-chip processing.
3Loss of information
If emergency warning information is transmitted using the conventional DVB-T2 method, then the information can be delivered, but the processing time is extended due to system-on-chip activation requirements
Solution Approach 1:
The emergency warning transmission is segmented into two parts: (1) L1-pre signaling containing emergency warning notification information that can be processed quickly by the receiver, and (2) the full emergency warning data that requires system-on-chip processing. This segmentation allows the receiver to detect and respond to emergency warnings faster by first processing the lightweight L1-pre signaling, reducing overall processing time while ensuring complete information delivery.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present technology relates to a transmission device, a transmission method, a reception device, and a reception method that realize a process related to emergency warning information in DVB-T2 standard more promptly at a low power consumption. There is provided a transmission device including an emergency warning information acquisition unit configured to acquire emergency warning information, a content acquisition unit configured to acquire content, a transmission frame generation unit configured to generate a T2 frame including emergency warning notification information indicating that emergency warning information is being transmitted in P1 signaling or L1-pre signaling as a T2 frame, according to DVB-T2 standard, composed of a P1 symbol including P1 signaling, a P2 symbol including L1-pre signaling, and a symbol of data, and a transmission unit configured to transmit the T2 frame as a digital broadcast signal. The present technology can be applied to a transmitter that is capable of transmitting the digital broadcast signal according to the DVB-T2 standard for example.