Sgsn Logical Network Interfaces - Cisco ASR 5000 series Product Overview

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▀ Network Deployments and Interfaces

Figure 162. Co-located SGSN and GGSN

SGSN Logical Network Interfaces

The SGSN provides IP-based transport on all RAN and Core Network interfaces, in addition to the standard IP-based

interfaces (Ga, Gn, Gp, Iu-PS). This means enhanced performance, future-proof scaling and reduction of inter-

connectivity complexity. The all-IP functionality is key to facilitating evolution to the next generation technology

requirements.

The SGSN provides the following functions over the logical network interfaces illustrated above:

IuPS: The SGSN provides an IP over ATM (IP over AAL5 over ATM) interface between the SGSN and the

RNCs in the 3G UMTS Radio Access Network (UTRAN). RANAP is the control protocol that sets up the data

plane (GTP-U) between these nodes. SIGTRAN (M3UA/SCTP) or QSAAL (MTP3B/QSAAL) handle IuPS-C

(control) for the RNCs.

Some of the procedures supported across this interface are:

▄ Cisco ASR 5000 Series Product Overview

IP-based GPR/UMTS Public Land Mobile Network (PLMN)

Control plane based on M3UA/SCTP

Serving GPRS Support Node (SGSN) Overview

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