8 QoS Attribute Mapping

23.1073GPPQuality of Service (QoS) concept and architectureRelease 17TS

NOTE: This clause shall contain information of attribute mapping i.e. how attribute in different levels of QoS (from external world and within UMTS network) shall be mapped. Current clause division is based on an assumption that levels of QoS presented in clause 6, but they are open to discussions.

8.1 From Application Attributes to UMTS Bearer Service Attributes

NOTE: This is an operator and/or implementation issue.

8.2 From UMTS Bearer Service Attributes to Radio Access Bearer Service Attributes

When establishing a UMTS bearer and the underlying Radio Access Bearer for support of a service request, some attribute on UMTS level does typically not have the same value as corresponding attribute on Radio Access Bearer level. For example requested transfer delay for the UMTS bearer shall typically be larger that the requested transfer delay for the Radio Access Bearer, as the transport through the core network will use a part of the acceptable delay.

For the following attributes/settings the attribute value for the UMTS bearer will normally be the same as the corresponding attribute value for the Radio Access Bearer:

– maximum bitrate;

– delivery order;

– delivery of erroneous SDUs;

NOTE 1: If Delivery of erroneous SDUs is set to ‘Yes’ the handling of error indications on UMTS Bearer level and Radio Access Bearer level differs. Error indications can only be provided on the MT/TE side of the UMTS bearer. On the CN Gateway side error indications can not be signalled outside of UMTS network in release 1999. Error indications can be provided on both end-points of the Radio Access Bearer.

– guaranteed bit rate;

– traffic handling priority;

– maximum SDU size;

– SDU format information.

NOTE 2: List of exact sizes of SDU’s shall be the same, exact format of SDU payload does not exist on UMTS Bearer level.

For the following attributes the attribute value for the UMTS bearer will normally not be the same as the corresponding attribute value for the Radio Access Bearer. The relation between the attribute values for UMTS Bearer service and Radio Access Bearer service is implementation dependent and depends for example on network dimensioning.

– Residual BER for Radio Access Bearer service shall be reduced with the bit errors introduced in the core network, by Core Network Bearer service.

– SDU error ratio for Radio Access Bearer service shall be reduced with the errors introduced in the core network, by Core Network Bearer service.

– Transfer delay for Radio Access Bearer service shall be reduced with the delay introduced in the core network, e.g. on transmission links or in a codec resident in the Core Network.

For the following attribute the value range for the UMTS bearer is not the same as the corresponding attribute value ranges for the Radio Access Bearer. The value for the Radio Access Bearer service attribute shall be derived from the values of one or more UMTS bearer service attributes:

– For PS services the Allocation/Retention Priority shall be derived from the UMTS bearer service attributes Allocation/Retention Priority. Other attributes may be used in addition. For CS services the Allocation/Retention Priority shall be derived from the eMLPP priority level attribute and/or the CS Allocation/Retention Priority attribute and/or the Mobile Station Category attribute (TS 23.008 [8]) (which is only available for subscribers in their home PLMN). Other attributes may be used in addition.

NOTE 3: The usage of other attributes can ensure that e.g. emergency calls would receive an appropriate RAB Allocation/Retention Priority.

NOTE 4: To ensure backwards compatibility different values of an UMTS bearer service attribute can be mapped to the same value of the RAB Allocation/Retention Priority attribute if necessary.

NOTE 5: From Release 9 onwards, the UMTS bearer service attribute Evolved Allocation/Retention Priority can be mapped directly to the of the RAB Allocation/Retention Priority attribute.

The following attributes/settings only exist on the Radio Access Bearer level:

– SDU format information – exact format of SDU payload is retrieved from the codec integrated in the core network.

– Source statistics descriptor is set to speech if the Radio Access Bearer transports compressed speech generated by the codec integrated in the core network.

8.3 From UMTS Bearer Service Attributes to CN Bearer Service Attributes

NOTE: This is operator’s choice.