Cisco Cisco ASR 5000
Support for SGSN QoS based on PLMN, RAT Type
How it Works ▀
SGSN Administration Guide, StarOS Release 18 ▄
How it Works
With the introduction of QoS selection based on RAT type, several QoS profiles can now be configured and associated
with the APN profile with the access type marked as either GPRS or UMTS.
with the APN profile with the access type marked as either GPRS or UMTS.
Listed below are the SGSN functions now supported for QoS selection:
1. Configuration of QoS based on RAT type
2. Configuration of QoS based on PLMN, this configuration automatically happens as the Operator policy is
PLMN based. The QoS Profile is configured on RAT basis.
3. SGSN provides support for configuring APN-AMBR and UE-AMBR per RAT Type.
The SGSN supports configuring all the R99 QoS parameter under the APN profile except for Traffic class. It also
supports configuring the R97 QoS parameters namely Delay Class, Reliability class, Peak throughput, Precedence class
and Mean Throughput. This configuration is used to over-ride the HLR provided Subscribed QoS value or the
configured values are used in combination with subscribed values.
supports configuring the R97 QoS parameters namely Delay Class, Reliability class, Peak throughput, Precedence class
and Mean Throughput. This configuration is used to over-ride the HLR provided Subscribed QoS value or the
configured values are used in combination with subscribed values.
QoS capping has to be performed at various levels like the RAT-Type and PLMN. To achieve QoS capping at different
levels, the Qos parameters under the APN profile are also made available under a new profile called the "Qos-profile".
The Qos-profile also provides support for over-riding the R97 QoS parameters, Traffic class, UE-AMBR and the APN-
AMBR (UE-AMBR and APN-AMBR applicable only for S4-SGSN). This feature enhancement supports backward
compatibility.
levels, the Qos parameters under the APN profile are also made available under a new profile called the "Qos-profile".
The Qos-profile also provides support for over-riding the R97 QoS parameters, Traffic class, UE-AMBR and the APN-
AMBR (UE-AMBR and APN-AMBR applicable only for S4-SGSN). This feature enhancement supports backward
compatibility.
The QoS Profile can be associated with the APN profile, for each access-type independently or as common to profile.
At the APN profile level, if QoS parameters (R99 parameters except traffic class) as well as a QoS profile are
configured, then the QoS profile takes precedence over the QoS parameters.
configured, then the QoS profile takes precedence over the QoS parameters.
QoS parameters in QoS profile and Apn profile are identical. The new QoS profile provides the modular approach in
configuring QoS parameters and associate it to APN Profile per RAT Type.
configuring QoS parameters and associate it to APN Profile per RAT Type.
QoS profile also provides an additional configuration (when compared to apn-profile) named "prefer-tc". This
configuration allows the operator to override the Traffic class received in Subscription. "prefer-tc" works closely with
"prefer-as-cap" configuration; either:
configuration allows the operator to override the Traffic class received in Subscription. "prefer-tc" works closely with
"prefer-as-cap" configuration; either:
1. If "prefer-as-cap" is set to both subscription and local then SGSN will negotiate the traffic class configured to
traffic class subscribed. Further QoS parameters under this traffic class will be negotiated.
2. If "prefer-as-cap" is set to local then QoS parameters under local configuration will be negotiated with requested
for QoS capping.
If operator configures "prefer-tc" then he is expected to configure all the QoS parameters of all traffic class under QoS
profile.
profile.