From the course: NB-IoT (Narrowband IoT) Engineering: Deployment, Configuration, Call Flow Analysis
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Radio bearers: SRB and DRB explained
From the course: NB-IoT (Narrowband IoT) Engineering: Deployment, Configuration, Call Flow Analysis
Radio bearers: SRB and DRB explained
We have delved into the core of how NB-IT devices communicate so efficiently. Let's explore the NB-IT bearer architecture, a streamlined system of data pipes that maintain full compatibility with LTE. Now, before any data can flow, the device must be in a connected state. First, the device achieves EMM-registered, which is the mobility management registration, meaning it is successfully authenticated and recognized by the core network's mobility management entity. MME holds valid location routing information for this particular device. Next, it establishes the ECM-connected state, which is the connection management, creating a control plane signaling connection between the device and the MME. Finally, there is a RRC connected state which is established, securing the radio link between the device and the base station. And once RRC connection is built, that's where the bearer comes into picture. So bearer refers to the logical connection established between a user device and the evolved…
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