Question about the SA and NSA options.
Haven’t read much about the 5GC, but when the EPC is able to serve to inter operate with the NR, why should an operator to decide to work with 5GC?
Sorry, to ask quite a basic one on the 5G.
EPC does not have all the components for 5G SA, so they upgrade it to 5GC.
Let me ask this way, what does an operator get in terms of features/services through 5GC?
In the 5G NSA case, the LTE EPC is able to work well with 5G NR and provide the 5G service.
It can provide basic services, but 5GC is mainly focused towards Edge Computing, Network Slicing and Low Latency.
An example of Edge Computing and Low Latency, typically for a 4G Core, operator will have S-GW deployed for every markets which are typically very far 100s of miles away.
And if a subscriber wants to connect to a Gaming server (Google Stadia for example) it has to go through operators network and then go to Google server which might be a 1000 miles away.
In case of 5GC, operators can open up network to Google to bring there server at multiple locations across the country closer to gNB.
When there is a connection request and after the authentication is done, gNB can connect directly to the Google Edge server which can be 100 miles away, this will dramatically improve latency.
Also 5GC is very advanced and there is a paradigm shift in the core architecture.
Not all 5G service NSA is able to provide mostly eMBB related service.
NSA mode does not use SDAP stack layer so new 5G QOS is not available here.
It is not possible to achieve URLLC and mMTC without 5GC.
Also Network Slicing and Edge Computing.
EPC can support only eMBB services, for URLLC and mMTC you need 5GC.
Among the advantage using 5GC:
- Slicing network
- QoS based on QFI