Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
New In This 8.0 Release
▀ SGSN Features
▄ Cisco ASR 5000 Series Product Overview
OL-22937-01
For more information, see the SGSN Overview in the Product Overview and the Traffic Policing and Shaping and
Dynamic QoS Renegotiation chapter in System Enhanced Feature Configuration Guide.
Dynamic QoS Renegotiation chapter in System Enhanced Feature Configuration Guide.
Session Recovery Support
The session recovery feature, now available for both 2G and 3G SGSNs, handles SGSN services for all attached and/or
activated subscribers.
activated subscribers.
When enabled, session recovery provides seamless failover and reconstruction of subscriber session information in the
event of a hardware or software fault within the system preventing a fully connected user session from being
disconnected.
event of a hardware or software fault within the system preventing a fully connected user session from being
disconnected.
This is an enhanced feature and requires a separate license key to be enabled with the SGSN service. For more
information on session recovery, refer to the System Enhanced Feature Configuration Guide.
information on session recovery, refer to the System Enhanced Feature Configuration Guide.
Short Message Service - SMS
The SGSN implements a configurable Short Message Service (SMS) to send and receive text messages up to 140 octets
in length.
in length.
The SGSN handles multiple, simultaneous messages of both types: those sent from the MS/UE (SMS-MO: mobile
originating) and those sent to the MS/UE (SMS-MT: mobile terminating).
originating) and those sent to the MS/UE (SMS-MT: mobile terminating).
After verifying a subscription for the PLMN‘s SMS service, the SGSN connects with the SMSC (Short Message Service
Center), via a Gd interface, to relay received messages (from a mobile) using MAP-MO-FORWARD-REQUESTs for
store-and-forward. In the reverse, the SGSN awaits messages from the SMSC via MAP-MT-FORWARD-REQUESTs
and checks the subscriber state before relaying them to the target MS/UE. The SGSN will employ both the Page
procedure and MNRG (mobile not reachable for GPRS) flags in an attempt to deliver messages to subscribers that are
absent.
Center), via a Gd interface, to relay received messages (from a mobile) using MAP-MO-FORWARD-REQUESTs for
store-and-forward. In the reverse, the SGSN awaits messages from the SMSC via MAP-MT-FORWARD-REQUESTs
and checks the subscriber state before relaying them to the target MS/UE. The SGSN will employ both the Page
procedure and MNRG (mobile not reachable for GPRS) flags in an attempt to deliver messages to subscribers that are
absent.
The SGSN supports both charging for SMS messages (MO - mobile originating and MT - mobile terminating) and
lawful intercept of SMS-MO and SMS-MT messages.
lawful intercept of SMS-MO and SMS-MT messages.
Configuration for the service is explained in the SGSN Administration Guide. The various CLI used to enable and
configure the SMS service are defined in the Command Line Interface Reference.
configure the SMS service are defined in the Command Line Interface Reference.
Traffic Handling - QoS Provisioning with ARP
The SGSN now enables setting the priority of service via the configuration of the Allocation/Retention Priority (ARP)
IE. By including this IE in the RANAP message during the RAB assignment procedure it is possible to specify the
relative importance of the radio access bearers for the allocation and retention of traffic. When there is a resource
crunch, the IE is used by the RNC to allocate or deallocate resources according to the defined priority. This IE also tells
whether queuing of packets is allowed or not.
IE. By including this IE in the RANAP message during the RAB assignment procedure it is possible to specify the
relative importance of the radio access bearers for the allocation and retention of traffic. When there is a resource
crunch, the IE is used by the RNC to allocate or deallocate resources according to the defined priority. This IE also tells
whether queuing of packets is allowed or not.