From the course: NB-IoT (Narrowband IoT) Engineering: Deployment, Configuration, Call Flow Analysis

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Coverage enhancement (CE) levels explained

Coverage enhancement (CE) levels explained

From the course: NB-IoT (Narrowband IoT) Engineering: Deployment, Configuration, Call Flow Analysis

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Coverage enhancement (CE) levels explained

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Imagine a smart sensor on a city lamppost with a very good signal and a votometer in the basement with a very weak signal. How does the network talk reliably to both? It uses a smart strategy called coverage enhancement or CE levels. It is like knowing when to talk normally and when you need to repeat yourself in a noisy room. The system constantly checks the signal strength of a device and assigns it one of the three CE levels. Let's see what each level does. First is CE level 0. This is for devices with a strong signal. Think of that smart sensor on an urban lamppost. It has a clear direct line of sight with the cell tower. Because the signal is already great, the network uses minimal repetitions and this saves the device battery life. Now what about the device that is in a trickier spot like deep inside a building that's where CE level 1 comes in. It's for moderate signals here the connection is okay but it needs a slight boost. The network provides that boost by increasing the…

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