Cisco Cisco ASR 5000
Serving GPRS Support Node (SGSN) Overview
SGSN Core Functionality ▀
SGSN Administration Guide, StarOS Release 18 ▄
Intra-SGSN RAUs
Inter-SGSN RAUs.
The design of the SGSN allows for very high scalability of RAUs. In addition, the high capacity of the SGSN and Flex
functionality provides a great opportunity to convert high impact Inter-SGSN RAUs to lower impact Intra-SGSN RAUs.
The SGSN provides functionality to enforce the following RAU restrictions:
functionality provides a great opportunity to convert high impact Inter-SGSN RAUs to lower impact Intra-SGSN RAUs.
The SGSN provides functionality to enforce the following RAU restrictions:
Prohibition of GPRS services
Enforce identity request
Enforce IMEI check
PLMN restriction
Roaming restrictions
The SGSN also provides functionality to optionally supply the following information to the MN:
P-TMSI Signature and Allocated P-TMSI
List of received N-PDU numbers for loss less relocation
Negotiated READY timer value
Equivalent PLMNs
PDP context status
Network features supported
Session Management
Session management ensures proper PDP context setup and handling.
For session management, the SGSN supports four 3GPP-compliant procedures for processing PDP contexts:
Activation
Modification
Deactivation
Preservation
PDP Context Activation
The PDP context activation procedure establishes a PDP context with the required QoS from the MN to the GGSN.
These can be either primary or secondary contexts. The SGSN supports a minimum of 1 PDP primary context per
attached subscriber, and up to a maximum of 11 PDP contexts per attached subscriber.
These can be either primary or secondary contexts. The SGSN supports a minimum of 1 PDP primary context per
attached subscriber, and up to a maximum of 11 PDP contexts per attached subscriber.
The PDP context types supported are:
PDP type IPv4
PDP type IPv6
PDP type IPv4v6
PDP type PPP