Cell Broadcast System (CBS):

Why in news? the Government of India has recently officially launched and tested its nationwide Cell Broadcast System. Millions of citizens received a loud, siren-like “Extremely Severe Alert” on their mobile devices as part of a trial to ensure the system can instantly warn the public during actual disasters like earthquakes, tsunamis, or flash floods.

 What is the Cell Broadcast System (CBS)?

CBS is a high-speed, location-based communication technology that allows the government to send emergency messages to every mobile phone within a specific geographic area simultaneously.

• Indigenous Development: It has been developed by C-DOT (Centre for Development of Telematics) under the Department of Telecommunications (DoT), in collaboration with the NDMA (National Disaster Management Authority).
• Evolution: It supplements the existing SACHET platform, which primarily used SMS-based alerts. CBS is a “one-to-many” broadcast, whereas SMS is a “one-to-one” message.

How It Works?

Unlike a standard SMS, which requires your phone number and is sent through a queue, Cell Broadcast works via a radio signal broadcast:

• Geo-Fencing: Authorities select a specific area on a map (e.g., a coastal district during a cyclone).
• Tower-to-Handset: The message is sent to all cell towers in that “fenced” area. The towers then broadcast the message to every handset connected to them.
• No “Number” Required: The system does not need a database of phone numbers. It hits every device—including those of tourists or people “roaming” in the area.
• Zero Congestion: Standard networks often crash during disasters due to high call volume. CBS uses a dedicated channel on the cellular network that remains unaffected by traffic jams.

Why is it a “Game-Changer” for India?

• Last-Mile Connectivity: It ensures that even a fisherman in a remote coastal village or a trekker in the Himalayas receives a warning if they have cellular signal.
• Common Alerting Protocol (CAP): It follows global standards (ITU-recommended), making it interoperable with various telecom providers (Jio, Airtel, BSNL, etc.).
• Safety Overrides: The “Extremely Severe” alerts are designed to bypass “Do Not Disturb” (DND) modes to ensure the user is woken up or alerted in life-threatening scenarios.

Action Required by Citizens:

While the recent alert was a test, users should ensure their settings are ready for a real emergency:

1. Go to Settings > Safety & Emergency.
2. Select Wireless Emergency Alerts.
3. Ensure Allow Alerts and Test Alerts are turned ON.