5GC Basic Self-study Series | 5GC Basics: Decoupling of Computing and Storage Resources

Video source: 51 Learning Communication "5G Core Network Foundation, Protocol and Signaling Process"

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Attached a summary post: 5GC Basic Self-study Series | Summary- Zhihu (zhihu.com) https://zhuanlan.zhihu.com/p/484677694

main content

Introduce the benefits and concepts of decoupling compute and storage

Introduce the functions of UDSF network elements

Introduces the concepts of structured and unstructured data

Example to illustrate the AMF disaster recovery process when there are UDSF network elements

Basic Concepts: Provenance in the Specification

The prototype of computing and storage decoupling: diskless workstations

Background: Troubles in 4G - Disaster Recovery of MME

Fix: MME Cluster

5GC Solutions: UDSF

AMF's disaster recovery solution (with UDSF deployed)

AMF's disaster recovery solution (specification source)

In the case that an AMF fails and the 5G-AN/peer CP NFs detect that the AMF has failed, or the 5G-AN/peer CP NFs receives notification from another AMF in the same AMF set that this AMF has failed, following actions are taken:

The OAM deregister the AMF from NRF indicating due to AMF failure.
5G-AN marks this AMF as failed and not consider the AMF for selection until explicitly notified.
When the 5G-AN or CP NFs need to select a different AMF from the same AMF set.
For deployments with UDSF, and AMF from the same AMF set can be selected.

Following actions should be taken by the newly selected AMF:

For deployments with UDSF, when there is a transaction with the UE the newly selected AMF retrieves the UE context from the UDSF using SUPI, 5G-GUTI or AMF UE NGAP ID and it processes the UE message accordingly and updates the 5G-GUTI towards the UE, if necessary.

Unstructured data vs structured data

Structured data in this specification refers to data for which the structure is defined in 3GPP specifications. Unstructured data refers to data for which the structure is not defined in 3GPP specifications. -- 23.501

[Structured data specifically refers to data whose structure is clearly defined in the 3GPP specification, while unstructured data is not clearly defined]