Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
Serving GPRS Support Node (SGSN) Overview
▀ Network Deployments and Interfaces
▄ Cisco ASR 5000 Series Product Overview
OL-22938-01
Figure 161. Co-located SGSN and GGSN
IP-based GPR/UMTS Public Land Mobile Network (PLMN)
UTRAN
Node-B
RNC
BTS
PCU
BSC
BSS
UE
UE
Gb
IuPS
Gs
SGSN
Gn
Gr
Gi
Gf
Ga
Gp
Gd
UDP
GGSN
in different
PLMN
PDN/
Internet
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.
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.
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:
Control plane based on M3UA/SCTP