From the course: Telecom Network Evolution: 2G-to-6G Technologies, Architecture, and Key Concepts
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4G call flow
From the course: Telecom Network Evolution: 2G-to-6G Technologies, Architecture, and Key Concepts
4G call flow
(light music) - [Instructor] We have discussed that registration can happen in various scenarios, like when the device first powers on, moves between different areas, or re-registers periodically. Now let's walk through what actually happens during the first time registration. There is a lot going on under the hood and it involves three key components. It is a user equipment, radio access network, and the core network. Here we are focusing on 4G. So what happens when the UE powers on? It first talk to the radio access network, and this involves the down link synchronization where UE tunes to the cell and reads System Information Blocks and Master Information Blocks. There are certain network related parameters like PLMN ID, bandwidth, and tracking area code, which are received in this case. Now, after the downlink synchronization, then comes the uplink synchronization, which allowing the UE to begin communication with the network. There is a RACH preamble, and then there is a RACH…
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