From the course: 5G Architecture, Design, Protocols, Evolution, and Deployment

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NSA architecture (option three): EN-DC

NSA architecture (option three): EN-DC

From the course: 5G Architecture, Design, Protocols, Evolution, and Deployment

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NSA architecture (option three): EN-DC

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(gentle music) - [Instructor] Now, let's take a closer look at the another option, which is Option 3 for 5G deployment. And this is the EN-DC, which is E-UTRAN and not dual connectivity. So E-UTRAN mean the RAN, the radio access network, belongs to 4G, and NR is new radio, which belongs to 5G. So we have both 4G and 5G radio access network present in EN-DC or Option 3. And this architecture forms the basis of 5G non-standalone deployments and was most widely adopted initial approach during the early years of 5G rollout from 2019 to 2022. There's a dual connectivity, and it means that under EN-DC a user equipment, or UE, connects simultaneously to LTE eNodeB and 5G gNodeB. Now, it is an integrated architecture where the LTE eNodeB acts as a master node and the secondary node would be the NR gNodeB. We will have the control plane connected only through 4G RAN in this case. So defining characteristics of Option 3 is how the control and user planes are splitted. So control plane, which is…

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