Cisco Cisco Packet Data Gateway (PDG) Wartungshandbuch

New Feature Summary

Generally Available    06-30-2010 

1-50

New CLI commands have been added to the Radio-Network-Controller configuration mode 
to govern the inclusion of the Signaling Indication IE in RANAP messages. Refer to the 
Command Line Interface Reference for information on enabling/disabling this feature.

The SGSN now supports the Ga interface to the CGF for accounting purposes. The SGSN 
uses the Ga interface to communicate with the charging gateway function (CGF) or the 
GTPP Storage Server (GSS) using GTP Prime (GTPP). The charging gateway is 
responsible for buffering and pre-processing billing records. One or more Ga interfaces can 
be configured per system context. This interface is supported through the following 
commands in the Context configuration Mode:

●

gtpp charging-agent address

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gtpp duplicate-hold-time minutes

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gtpp echo-interval

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gtpp max-cdrs

●

gtpp max-pdu-size

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gtpp max-retries

●

gtpp redirection-allowed

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gtpp server

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gtpp storage-server

●

gtpp timeout

The SGSN, with its high capacity, signaling performance, and peering capabilities 
combined with its level of fault tolerance, delivers many of the benefits of Flex functionary 
even without deploying SGSN pooling.

As defined by 3GPP TS 23.236, the SGSN implements Gb-Flex functionality to ensure 
SGSN pooling for 2.5G accesses as both separate pools and as dual-access pools. SGSN 
pooling enables the following:

●

Eliminates the single point of failure between a BSS and an SGSN.

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Ensures geographical redundancy, as a pool can be distributed across sites.

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Minimizes subscriber impact during service, maintenance, or node additions or 
replacements.

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Increases overall capacity via load sharing across the SGSNs in a pool.

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Reduces the need/frequency for inter-SGSN RAUs. This substantially reduces signaling 
load and data transfer delays.

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Supports load redistribution with the SGSN off loading procedure.