Cell Broadcast Emergency Alert Signal Conversion
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Solution Overview
Problem
Existing cell broadcast services face challenges in delivering emergency alert messages when the broadband network fails, particularly during disasters, as backbone networks can be damaged, preventing messages from being sent to base stations and received by mobile users.
Innovation Solution
A method and apparatus that convert cell broadcast service signals into public warning broadcast signals, including Advanced Emergency Alert Table (AEAT) signals, which can be transmitted over a broadcast network, allowing both ATSC 3.0 capable TVs and general mobile terminals to receive emergency alerts, and include rich-media information and Non-Real-Time (NRT) files with Uniform Resource Locator (URL) information, ensuring message delivery even in network failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If cell broadcast service uses broadband network for emergency alert delivery, then message delivery speed is improved, but system reliability deteriorates when backbone network fails
Solution Approach 1:
The patent introduces a broadcast network as an intermediary transmission path for emergency alert messages. The Cell Broadcast Center (CBC) transmits messages through both broadband network (original path) and broadcast network (alternative path). This intermediary broadcast network serves as a mediator that can deliver messages when the broadband backbone network fails, thus improving system reliability without sacrificing delivery speed in normal conditions.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the dual-path transmission system before network failures occur. The CBC is set up to simultaneously or alternatively transmit messages through broadcast network infrastructure in advance, so that when broadband network fails, the alternative path is already prepared and can immediately take over, ensuring continuous message delivery.
2Device complexity
If cell broadcast service transmits only through broadband network, then device complexity is reduced, but adaptability deteriorates for different receiver types
Solution Approach 1:
The patent applies universality by making the transmission system multi-functional to serve different types of receivers. The broadcast network transmission uses standardized broadcast protocols that can be received by both ATSC 3.0 capable TVs and general mobile terminals. This universal approach allows a single transmission infrastructure to serve multiple receiver types with different capabilities, enhancing adaptability without significantly increasing system complexity.
Solution Approach 2:
The patent segments the receiver population into different groups (ATSC 3.0 capable devices and general mobile terminals) and provides tailored message delivery for each segment through the broadcast network. The message format and transmission parameters can be adjusted to suit different receiver capabilities, ensuring that each segment receives appropriate information through the most suitable path.
3Reliability
If cell broadcast service uses broadcast network for redundancy, then message delivery reliability is improved, but communication cost increases
Solution Approach 1:
The patent implements partial action by not continuously transmitting through both broadband and broadcast networks simultaneously. Instead, the system transmits through the primary broadband network under normal conditions and only activates the broadcast network path when broadband network failure is detected or suspected. This partial utilization of the redundant path maintains reliability while minimizing the additional communication costs associated with dual-path transmission.
Data Source
AI summary
Disclosed herein is a method of operating an apparatus for providing a cell broadcast service. The operating method includes receiving, by a transmission device of a broadcaster, a cell broadcast service signal containing an emergency alert from a mobile carrier; converting, by the transmission device, the cell broadcast service signal into a public warning broadcast signal; and transmitting, by the transmission device, the public warning broadcast signal to a mobile switching center or a base station.