Cisco Cisco ASR 5000
Serving GPRS Support Node (SGSN) Overview
Features and Functionality ▀
SGSN Administration Guide, StarOS Release 18 ▄
works along similar lines providing further flexibility to the operator in allowing activations when the MS requested
APN is incorrect, misspelled, or not present in the subscription.
APN is incorrect, misspelled, or not present in the subscription.
The SGSN's APN selection procedure is based on 3GPP 23.060 Annex A, which this feature extends based on CLI
controls under the APN Remap Table configuration mode.
controls under the APN Remap Table configuration mode.
APN Resolution with SCHAR or RNC-ID
It is now possible to append charging characteristic information to the DNS string. The SGSN includes the profile index
value portion of the CC as binary/decimal/hexadecimal digits (type based on the configuration) after the APN network
identification. The charging characteristic value is taken from the subscription record selected for the subscriber during
APN selection. This enables the SGSN to select a GGSN based on the charging characteristics information.
value portion of the CC as binary/decimal/hexadecimal digits (type based on the configuration) after the APN network
identification. The charging characteristic value is taken from the subscription record selected for the subscriber during
APN selection. This enables the SGSN to select a GGSN based on the charging characteristics information.
After appending the charging characteristic the DNS string will take the following form:
<apn_network_id>.<profile_index>.<apn_operator_id >
. The profile index in the following example has a
value 10:
quicknet.com.uk.1010.mnc234.mcc027.gprs
.
If the RNC_ID information is configured to be a part of the APN name, and if inclusion of the profile index of the
charging characteristics information is enabled before the DNS query is sent, then the profile index is included after the
included RNC_ID and the DNS APN name will appear in the following form:
charging characteristics information is enabled before the DNS query is sent, then the profile index is included after the
included RNC_ID and the DNS APN name will appear in the following form:
<apn_network_id>.<rnc_id>.<profile_index>.<apn_operator_id>.
In the following example, the DNS
query for a subscriber using RNC 0321 with the profile index of value 8 would appear as:
quicknet.com.uk.0321.1000.mnc234.mcc027.gprs.
APN Restriction
The reception, storage, and transfer of APN Restriction values is used to determine whether a UE is allowed to establish
PDP Context or EPS bearers with other APNs. This feature is supported by both the Gn/Gp-SGSN and the S4-SGSN.
PDP Context or EPS bearers with other APNs. This feature is supported by both the Gn/Gp-SGSN and the S4-SGSN.
During default bearer activation, the SGSN sends the current maximum APN restriction value for the UE to the
GGSN/P-GW in a Create Session Request (CSR). The GGSN/P-GW retains an APN restriction value for each APN.
The UE’s APN Restriction value determines the type of application data the subscriber is allowed to send. If the
maximum APN restriction of the UE (received in the CSR) and the APN Restriction value of the APN (for which
activation is being request) do not concur, then the GGSN/P-GW rejects activation. The maximum APN restriction for a
UE is the most restrictive based on all already active default EPS bearers.
GGSN/P-GW in a Create Session Request (CSR). The GGSN/P-GW retains an APN restriction value for each APN.
The UE’s APN Restriction value determines the type of application data the subscriber is allowed to send. If the
maximum APN restriction of the UE (received in the CSR) and the APN Restriction value of the APN (for which
activation is being request) do not concur, then the GGSN/P-GW rejects activation. The maximum APN restriction for a
UE is the most restrictive based on all already active default EPS bearers.
This feature provides the operator with increased control to restrict certain APNs to UEs based on the type of APN. This
feature requires no special license.
feature requires no special license.
APN Restriction for SGSN is enabled/disabled in the
call-control-profile
configuration mode using the
apn-
restriction
command. Refer to the Command Line Interface Reference for usage details.
Automatic Protection Switching (APS)
Automatic protection switching (APS is now available on an inter-card basis for SONET configured CLC2 (Frame
Relay) and OLC2 (ATM) optical line cards. Multiple switching protection (MSP) version of is also available for SDH
configured for the CLC2 and OLC2 (ATM) line cards.
Relay) and OLC2 (ATM) optical line cards. Multiple switching protection (MSP) version of is also available for SDH
configured for the CLC2 and OLC2 (ATM) line cards.
APS/MSP offers superior redundancy for SONET/SDH equipment and supports recovery from card failures and fiber
cuts. APS allows an operator to configure a pair of SONET/SDH lines for line redundancy. In the event of a line
problem, the active line switches automatically to the standby line within 60 milliseconds (10 millisecond initiation and
50 millisecond switchover).
cuts. APS allows an operator to configure a pair of SONET/SDH lines for line redundancy. In the event of a line
problem, the active line switches automatically to the standby line within 60 milliseconds (10 millisecond initiation and
50 millisecond switchover).