Cisco Cisco ASR 5000
Serving GPRS Support Node (SGSN) Overview
Network Deployments and Interfaces ▀
SGSN Administration Guide, StarOS Release 18 ▄
Frame Relay congestion handling
Traffic management per Frame Relay VC
NS load sharing
NS control procedures
BVC management procedures
Paging for circuit-switched services
Suspend/Resume
Flow control
Unacknowledged mode
Acknowledged mode
Gn/Gp: The Gn/Gp interfaces, comprised of GTP/UDP/IP-based protocol stacks, connect the SGSNs and
GGSNs to other SGSNs and GGSNs within the same public land mobile network (PLMN) - the Gn - or to
GGSNs in other PLMNs - the Gp.
GGSNs in other PLMNs - the Gp.
This implementation supports:
GTPv0 and GTPv1, with the capability to auto-negotiate the version to be used with any particular peer
GTP-C (control plane) and GTP-U (user plane)
Transport over ATM/STM-1Optical (only available with an ASR 5000 chassis), Fast Ethernet, and
Ethernet 1000 line cards/QGLCs)
One or more Gn/Gp interfaces configured per system context
As well, the SGSN can support the following IEs from later version standards:
IMEI-SV
RAT TYPE
User Location Information
Extended PDP Type (Release 9)
Extended RNC ID (Release 9)
Ge: This is the interface between the SGSN and the SCP that supports the CAMEL service. It supports both SS7
and SIGTRAN and uses the CAP protocol.
Gr: This is the interface to the HLR. It supports SIGTRAN (M3UA/SCTP/IP) over Ethernet.
Some of the procedures supported by the SGSN on this interface are:
Send Authentication Info
Update Location
Insert Subscriber Data
Delete Subscriber Data
Cancel Location
Purge
Reset