Cisco Cisco ASR 5000
Serving GPRS Support Node (SGSN) Overview
▀ Features and Functionality
▄ SGSN Administration Guide, StarOS Release 18
Equivalent PLMN
This feature is useful when an operator deploys both GPRS and UMTS access in the same radio area and each radio
system broadcasts different PLMN codes. It is also useful when operators have different PLMN codes in different
geographical areas, and the operators’ networks in the various geographical areas need to be treated as a single HPLMN.
system broadcasts different PLMN codes. It is also useful when operators have different PLMN codes in different
geographical areas, and the operators’ networks in the various geographical areas need to be treated as a single HPLMN.
This feature allows the operator to consider multiple PLMN codes for a single subscriber belonging to a single home
PLMN (HPLMN). This feature also allows operators to share infrastructure and it enables a UE with a subscription with
one operator to access the network of another operator.
PLMN (HPLMN). This feature also allows operators to share infrastructure and it enables a UE with a subscription with
one operator to access the network of another operator.
First Vector Configurable Start for MS Authentication
Previously, the SGSN would begin authentication towards the MS only after the SGSN received all requested vectors.
This could result in a radio network traffic problem when the end devices timed out and needed to re-send attach
requests.
This could result in a radio network traffic problem when the end devices timed out and needed to re-send attach
requests.
Now, the SGSN can be configured to start MS authentication as soon as it receives the first vector from the AuC/HLR
while the SAI continues in parallel. After an initial attach request, some end devices restart themselves after waiting for
the PDP to be established. In such cases, the SGSN restarts and a large number of end devices repeat their attempts to
attach. The attach requests flood the radio network, and if the devices timeout before the PDP is established then they
continue to retry, thus even more traffic is generated. This feature reduces the time needed to retrieve vectors over the
GR interface to avoid the high traffic levels during PDP establishment and to facilitate increased attach rates.
while the SAI continues in parallel. After an initial attach request, some end devices restart themselves after waiting for
the PDP to be established. In such cases, the SGSN restarts and a large number of end devices repeat their attempts to
attach. The attach requests flood the radio network, and if the devices timeout before the PDP is established then they
continue to retry, thus even more traffic is generated. This feature reduces the time needed to retrieve vectors over the
GR interface to avoid the high traffic levels during PDP establishment and to facilitate increased attach rates.
Format Encoding of MNC and MCC in DNS Queries Enhanced
In order to provide effective control on DNS queries for particular type of procedures, existing CLI commands in GPRS
and SGSN services have been deprecated and replaced with new enhanced commands. The command
and SGSN services have been deprecated and replaced with new enhanced commands. The command
dns israu-
mcc-mnc-encoding [hexadecimal | decimal]
has been deprecated and a new CLI command
dns mcc-mnc-
encoding { rai-fqdn | apn-fqdn | rnc-fqdn| mmec-fqdn| tai-fqdn}* {a-query | snaptr-query
}* { decimal | hexadecimal }
}* { decimal | hexadecimal }
. New keyword options
snaptr-query
and
a-Query
are provided to control
different types of queries.
To ensure backward compatibility:
1. If the command
dns israu-mcc-mnc-encoding decimal
is executed, it will be auto converted to d
ns
mcc-mnc-encoding rai-fqdn a-query snaptr-query decimal
.
2. If the command
dns israu-mcc-mnc-encoding hexadecimal
is executed, it will be auto converted to
dns
mcc-mnc-encoding rai-fqdn a-query snaptr-query hexadecimal
For more information see, Command Line Interface Reference.
Gb Manager
A new SGSN proclet has been developed. Now, all the link level procedures related to Gb -
protocol (GPRS-NS and BSSGP) hosting, handling, administration, message distribution,
keeping the other managers informed about the link/remote-node status,
handling functionality of the Gb interface (all 2G signaling)
are removed from the Link Manager and moved to the SGSN's new Gb Manager proclet.