On Feb. 22, 2022, AT&T is scheduled to turn off its 3G cellular network. T-Mobile is scheduled to turn its off on July 1, 2022, and Verizon is slated to follow suit on Dec. 31, 2022.
The vast majority of cellphones in service operate on 4G/LTE networks, and the world has begun the transition to 5G, but as many as 10 million phones in the U.S. still rely on 3G service. In addition, the cellular network functions of some older devices like Kindles, iPads and Chromebooks are tied to 3G networks. Similarly, some older internet-connected systems like home security, car navigation and entertainment systems, and solar panel modems are 3G-specific. Consumers will need to upgrade or replace these systems.
So why are the telecommunications carriers turning off their 3G networks? As an electrical engineer who studies wireless communications, I can explain. The answer begins with the difference between 3G and later technologies such as 4G/LTE and 5G.
Picture a family trip. Your spouse is on the phone arranging activities to do at the destination, your teenage daughter is streaming music and chatting with her friends on her phone, and her younger sibling is playing an online game with his friends. All those separate conversations and data streams are communicated over the cellular network, seemingly simultaneously. You probably take this for granted, but have you ever wondered how the cellular system can handle all those activities at the same time, from the same car?
How does it work when everyone in your car is using cellular voice and data service at the same time, and so are many of the people in the cars around you?
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Communicating all those messages
The answer is a technological trick called multiple access. Imagine using a sheet of paper to write messages to 100 different friends, one private message for each person. The multiple access technology used in 3G networks is like writing every message to each of your friends using the whole sheet of paper, so all the messages are written on top of each other. But you have a special set of pens with different colors that allows you to write each message in a unique color, and each of your friends has a special pair of glasses that reveals only the color intended for that person.
However, the number of colored pens is fixed, so if you want to send messages to more people than the number of colored pens you have, you will need to start mixing colors. Now when a friend applies their special lenses, they will see a little bit of the messages to other friends. They won’t see enough to read the other messages, but the overlap might be enough to blur the message intended for them, making it harder to read.
The multiple access technology used by 3G networks is called Code Division Multiple Access, or CDMA. It was invented by Qualcomm founder Irwin M. Jacobs with several other prominent electrical engineers. The…