Дорожная карта для Cisco Cisco Packet Data Gateway (PDG)
New In This 8.0 Release
▀ SGSN Features
▄ Cisco ASR 5000 Series Product Overview
OL-22937-01
Gb-Flex - SGSN Pooling
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.
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:
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.
Ensures geographical redundancy, as a pool can be distributed across sites.
Minimizes subscriber impact during service, maintenance, or node additions or replacements.
Increases overall capacity via load sharing across the SGSNs in a pool.
Reduces the need/frequency for inter-SGSN RAUs. This substantially reduces signaling load and data transfer
delays.
Supports load redistribution with the SGSN offloading procedure.
Gs Interface to the MSC/VLR
In Release 8.0, the SGSN now supports the Gs interface to the MSC/VLR.
This interface is vital in the call-setup process as these databases provide authentication information about MS/UEs
attempting to attach.
attempting to attach.
The Gs Service Configuration Mode has been added to configure and manage the Gs interface between the SGSN and
the MSC/VLR. This new mode includes the following commands:
the MSC/VLR. This new mode includes the following commands:
associate-sccp-network
bssap+
default
end
exit
max-retransmission
non-pool-area
pool-area
timeout
vlr
The new commands will be found the chapter titled Gs Service Configuration Mode Commands in the Command Line
Interface Reference.
Interface Reference.