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
Hard Disk Storage for CDR Files
A hard disk has been introduced in the ASR 5000 to add storage capability.
When storing CDR files on the SMC hard disk, first they are stored on RAMFS before they are moved to the hard disk
and then they can be off-loaded via ftp or sftp to an external server (such as the L-ESS or the GSS) or billing system.
For additional support information, see .
and then they can be off-loaded via ftp or sftp to an external server (such as the L-ESS or the GSS) or billing system.
For additional support information, see .
Use the new command
command in
GTPP Group Configuration Mode to configure and enable hard disk usage.
Use the new show/clear commands
in the Exec Mode to monitor/clear the file counters and statistics on the hard
disk.
Use the new
and
commands in the Global
Configuration Mode to allocate RAM for files and the number of compression process to support the hard disk
functionality.
functionality.
IuFlex / SGSN Pooling
The SGSN supports 2G Gb Flex with SGSN Pooling and now 3G Iu Flex with SGSN Pooling as an orderable feature.
Iu Flex and SGSN Pooling functionality has been implemented according to 3GPP TS23.236. The SGSN supports
pooling for both 3G and 2G accesses, both as separate pools and as dual-access pools.
pooling for both 3G and 2G accesses, both as separate pools and as dual-access pools.
IuFlex works by defining NRIs in the SGSN service and configuring RNCs as pooled. Pooled RNCs will be able to co-
exist with RNCs that are connected to only one SGSN.
exist with RNCs that are connected to only one SGSN.
Iu Flex offloading is also enabled via configuration. This implementation allows carriers to load balance sessions among
pooled SGSNs; where Iu Flex provides carriers deterministic failure recovery.
pooled SGSNs; where Iu Flex provides carriers deterministic failure recovery.
Additional benefits of Iu Flex include:
Enables geographical redundancy, as a pool can be distributed across sites.
Increases overall capacity, as load sharing across the SGSNs in a pool is possible.
Reduces signaling load as well as data transfer due to conversion of inter-SGSN RAUs to intra-SGSN RAUs for
moves between RAs controlled by the same pool.
Simplifies introduction of new nodes and replacement of old nodes as subscribers can be moved in a planned
manner to new nodes.
Eliminates single point of failure between an RNC/BSS and SGSN.
Enables service downtime for maintenance scheduling.
Multiple PLMN Support (2.5G only)
With this new feature, the 2.5G SGSN supports cell-sites with more than one PLMN-ID.