Cisco Cisco ASR 5000
SGSN Service Configuration Procedures
▀ Configuring QoS Mapping for EPC-Capable UEs using the S4 Interface (S4 Only, Optional)
▄ SGSN Administration Guide, StarOS Release 18
Configuring QoS Mapping for EPC-Capable UEs using the S4
Interface (S4 Only, Optional)
An S4-SGSN communicates QoS parameters towards the SGW and PGW in EPC QoS. However, it sends QoS towards
the UE in the QoS format defined in the GMM/SM specification (TS 24.008). 3GPP defines a mapping for EPS QoS to
pre-release 8 QoS in TS 23.401, Annex E. On the S4-SGSN, operators can configure the quality of service (QoS)
parameters as Call Control Profiles that will ensure proper QoS mapping between the S4-SGSN and the EPC gateways
(PGW and SGW) and UEs. However, such configurations are optional. If no mapping is configured, then the S4-SGSN
uses the default mapping.
the UE in the QoS format defined in the GMM/SM specification (TS 24.008). 3GPP defines a mapping for EPS QoS to
pre-release 8 QoS in TS 23.401, Annex E. On the S4-SGSN, operators can configure the quality of service (QoS)
parameters as Call Control Profiles that will ensure proper QoS mapping between the S4-SGSN and the EPC gateways
(PGW and SGW) and UEs. However, such configurations are optional. If no mapping is configured, then the S4-SGSN
uses the default mapping.
The configured Call Control Profiles also will be used if the S4 interface is chosen for PDP activation, but the
subscription does not have an EPS subscription. Therefore, GPRS subscription data (which uses QoS in pre-release 8
format), will be mapped to EPS QoS behavior. The allocation and retention policy will be mapped to EPS ARP using
the configured Call Control Profiles. Specifically, the configuration provided in this section enables the S4-SGSN to:
subscription does not have an EPS subscription. Therefore, GPRS subscription data (which uses QoS in pre-release 8
format), will be mapped to EPS QoS behavior. The allocation and retention policy will be mapped to EPS ARP using
the configured Call Control Profiles. Specifically, the configuration provided in this section enables the S4-SGSN to:
Map EPC ARP (allocation and retention priority) parameters to pre-release 8 ARP (Gn/Gp ARP) parameters
during S4-SGSN to Gn SGSN call handovers.
Map ARP parameters received in a GPRS subscription from the HLR to EPC ARP parameters if the S4 interface
is selected for an EPC capable UE that has only a GPRS subscription (but no EPS subscription) in the HLR /
HSS.
HSS.
If the QoS mapping configuration is not used, the following default mappings are used:
Default ARP high-priority value = 5
Default ARP medium-priority value = 10
Default pre-emption capability =
shall-not-trigger-pre-emption
Default pre-emption vulnerability =
pre-emptable
Use this procedure to configure QoS mapping for EPC Gateways and UEs:
Step 1
Access Call Control Profile Configuration Mode and create a call-control-profile.
Step 2
Configure the QoS ARP settings.
Step 3
Exit back to the Local prompt.
Step 4
Access the call-control profile you just configured.
Step 5
Configure the QoS pre-emption or vulnerability capabilities.
Example Configuration
config
call-control-profile <cc_profile_name>
qos gn-gp arp high-priority <hi_prior_value> medium-priority <med_prior_value>
end