The Service Communication Proxy (SCP) is a new HTTP/2-based network function enabling dynamic scaling and management of communication and services in the 5G network. The SCP has a role that in some ways can be compared with its predecessors, such as the Signaling Transfer Point (STP), the central signaling router used in 2G and 3G to route SS7signaling messages, as well as the Diameter Signaling Controller (DSC) doing the same for Diametermessages in 4G.
Service Communication Proxy (SCP), Source: Huawei
A key difference with these legacy routers is that the SCP can be responsible to resolve Network Function (NF) discovery requests via communication with the Network Repository Function (NRF), and can initiate Domain Name Server (DNS A-record) IP address lookups to a DNS to locate every live instance for every available Network Function.
IMS Support for SA Option 2 and Voice over NR When 3GPP defined 5G in 3GPP Release 15 (Rel-15), the impact on IMS was minimized to assist with 5G deployment. From an IMS point of view, Rel-15 5G Core looks similar to the 4G Evolved Packet Core (EPC): • The…
The latency of the idle-to-active procedure in NSA is larger than in SA. The different latencies come from signaling differences in the architecture. In NSA, to transition from idle to an active state, the UE first performs an idle-to-active procedure in LTE, which serves as the MN. Once connected, the UE…
5G Core adds new values as per below: Optimized interworking with 5G NR —Reduced signaling. — Lower control-plane latency. —Only a standardized solution for NR Standalone (SA). Enhanced service capabilities — Improved network slice isolation and security (NSSF). — One Core for all access types (including fixed). Service-Based Architecture (SBA)…
