Cisco Cisco ASR 5000
Serving GPRS Support Node (SGSN) Overview
▀ Network Deployments and Interfaces
▄ SGSN Administration Guide, StarOS Release 18
Figure 2.
GSN Combo Architecture
S4-SGSN Deployments
An S4-SGSN is an SGSN that is configured for S4 interface support to enable the soft handover of 2G and 3G
subscribers to the EPC S-GW via the EPC S4 interface. Comprehensive S4-SGSN support includes interfaces to the
following network elements and gateways:
subscribers to the EPC S-GW via the EPC S4 interface. Comprehensive S4-SGSN support includes interfaces to the
following network elements and gateways:
EPC serving gateway (S-GW) via the S4 interface
Equipment identity registry (EIR) via the S13’ interface
Home subscriber server (HSS) via the S6d interface
EPC mobility management entity (MME) via the S3 interface
Peer S4-SGSN via the S16 interface
The S4, S13’ and S6d interfaces are license-enabled features. Support for the S16 and S3 interfaces are included as part
of the S4 license.
of the S4 license.