Why in news?
India has introduced the SACHET Cell Broadcast system, an indigenous emergency messaging service designed to deliver instant alerts to citizens during crises such as natural disasters, wars, or other emergencies.
As part of testing, the government sent a nationwide notification with a siren sound, clarifying that no action was required as it was only a test message.
The initiative aims to strengthen India’s disaster response framework by ensuring timely alerts, thereby enhancing public safety and building a more resilient communication ecosystem.
What’s in Today’s Article?
- SACHET: India’s Integrated Emergency Alert System
- Cell Broadcast Technology: A Powerful Tool for Emergency Alerts
- How Cell Broadcast Technology Works?
- Cell Broadcast vs SMS: Key Differences
SACHET: India’s Integrated Emergency Alert System
- SACHET (meaning “alert”) is an Integrated Alert System designed to deliver disaster and emergency warnings directly to mobile users in geo-targeted areas via SMS.
- Institutional Framework
- Launched by the Department of Telecommunications (DoT)
- Developed in collaboration with the National Disaster Management Authority (NDMA)
- Aims to strengthen real-time disaster communication across India
- Purpose and Scope
- Provides timely alerts during:
- Natural disasters (cyclones, earthquakes, floods)
- Man-made emergencies (gas leaks, chemical hazards, wars)
- Ensures rapid dissemination of critical information to citizens
- How the System Works?
- Uses cellular network towers to broadcast alerts
- Works as a one-way communication system
- Does not require internet connectivity
- Can deliver messages to billions of users within seconds (if connected to network)
- Alerts can be nationwide or location-specific
- Coverage and Reach
- Operational across all 36 States and Union Territories
- Has delivered over 134 billion SMS alerts
- Supports communication in 19 Indian languages
- Test Use in India
- Around 11:40 AM on May 2, 2026, smartphones across India emitted a loud alert sound with vibrations and a pop-up message titled “extremely severe alert”, as part of a nationwide test of the cell broadcast system.
- Similar systems are already used in countries like Japan for tsunami and disaster warnings.
- India’s recent test marks one of the largest-scale implementations of this technology.
- Significance
- Enhances disaster preparedness and response
- Improves last-mile connectivity of emergency alerts
- Builds a more resilient and responsive public communication system in India
Cell Broadcast Technology: A Powerful Tool for Emergency Alerts
- Cell Broadcast is a communication method that enables authorities to send short messages simultaneously to multiple mobile phones within a specific geographic area.
- It can target either a large population or a limited set of users in a hazard-affected zone, ensuring precise and efficient dissemination of alerts.
- A major advantage of cell broadcast technology is its ability to bypass network congestion, allowing messages to be delivered instantly even during peak traffic conditions.
- It does not rely on internet connectivity and can be customised based on user preferences such as language, making it highly effective for mass communication.
- Origin and Global Adoption
- Developed in the early 1990s by the European Telecommunications Standards Institute and first demonstrated in Paris in 1997, the technology has since been adopted globally.
- Today, it is used by over 30 countries as a best practice for issuing timely warnings during natural disasters.
How Cell Broadcast Technology Works?
- Cell broadcast operates through the routine communication between mobile network towers and phones within their coverage area.
- These towers continuously transmit network-related information to connected devices, which usually remains invisible to users.
- Authorities utilise this existing one-way communication system to send emergency alerts.
- Instead of relying on individual messaging, the system enables a single alert to be transmitted from a cell tower to all connected devices simultaneously.
- By broadcasting one message to multiple users at once, cell broadcast ensures instant, wide-scale delivery without network congestion, making it highly effective for real-time alerts during disasters and emergencies.
Cell Broadcast vs SMS: Key Differences
- So far, India relied on an SMS-based disaster alert system operational across all 36 States and Union Territories.
- Over 134 billion sms alerts have been sent in 19+ Indian languages, ensuring broad reach.
- Now it has developed cell broadcast technology as a more advanced alert mechanism.
- It is not clear when the full rollout of this technology will take place.
- Cell Broadcast (CB) is a one-to-many system, allowing a single message to reach millions of devices simultaneously, whereas SMS operates on a one-to-one basis, sending messages individually to each recipient.
- CB sends alerts through specific cell towers, targeting users within a geographic area.
- Unlike SMS, it does not require phone numbers, enabling precise, location-specific messaging without tracking individuals.
- Cell Broadcast is more privacy-friendly, as it does not rely on user data. It can also reach visitors and foreign users in the area, often delivering messages in multiple languages.
- CB alerts are highly conspicuous, featuring loud sounds and pop-ups, making them difficult to ignore. In contrast, SMS messages can be missed or overlooked more easily.
