8.4 Mapping of Parameters for the Purge Procedure

29.3053GPPInterWorking Function (IWF) between MAP based and Diameter based interfacesRelease 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

8.4.1 PUR mapping to PurgeMS-Arg

When the IWF needs to construct a MAP-PurgeMS message as a result of receiving an PUR command (see sections 7.4.1 step 2 and 7.4.2. step 2), the IWF shall open a MAP dialogue in application context version 3 and populate sub-parameters of PurgeMS-Arg as described below:

imsi in PurgeMS-Arg shall be populated with the imsi value of the User-Name AVP received within PUR.

vlr-Number in PurgeMS-Arg shall be absent.

sgsn-Number in PurgeMS-Arg shall be populated with a value locally assigned to the IWF and consistent with SS7 routing principles.

extensionContainer in PurgeMS-Arg shall be absent.

8.4.2 PurgeMS-Res / Error mapping to PUA

When the IWF needs to construct an PUA command as a result of receiving a PurgeMS Ack/Error message (see sections 7.4.1 step 4 and 7.4.2. step 6), the IWF shall populate AVPs of PUA as described below:

Result-Code / Experimental-Result AVP shall be set to:

– DIAMETER_SUCCESS if a PurgeMS-Res parameter was received in a TCAP ResultLast component;

– DIAMETER_ERROR_USER_UNKNOWN if an error of unknownSubscriber without a diagnostic parameter or with a diagnostic parameter of imsiUnknown or gprs-eps-SubscriptionUnknown was received;

– an appropriate DIAMETER base protocol result code otherwise.

Auth-Session-State AVP shall be set to the value NO_STATE_MAINTAINED (1).

PUA-Flags AVP: Flags shall be set as follows:

– Freeze M-TMSI shall be set to 1 if the freezeM-TMSI parameter was present within PurgeMS-Res; otherwise shall be set to 0.

– Freeze P-TMSI shall be set to 1 if the freezeP-TMSI parameter was present within PurgeMS-Res; otherwise shall be set to 0.

8.4.3 PurgeMS-Arg mapping to PUR

When the IWF needs to construct a PUR command as a result of receiving a MAP-PurgeMS message (see section 7.4.2 step 3), the the IWF shall populate AVPs of PUR as described below:

Auth-Session-State AVP shall be set to the value NO_STATE_MAINTAINED (1).

User-Name AVP shall be populated with the value received within the imsi parameter of PurgeMS-Arg.

Supported-Features AVP shall be absent.

8.4.4 PUA mapping to PurgeMS-Res/Error

When the IWF needs to construct MAP-PurgeMS Ack message as a result of receiving a PUA command (see section 7.4.2.step 5), the IWF shall populate sub-parameters of PurgeMS-Res/Error as described below:

PurgeMS-Res:

freezeTMSI in PurgeMS-Res shall be absent.

freezeP-TMSI in PurgeMS-Res shall be present if a Freeze-P-TMSI indication was received within the PUA-Flags AVP within PUA.

extensionContainer in PurgeMS-Res shall be absent.

freezeM-TMSI in PurgeMS-Res shall be present if a Freeze-M-TMSI indication was received within the PUA-Flags AVP within PUA.

PurgeMS Error:

An error of unknownSubscriber with unknownSubscriberParam containing a unknownSubscriberDiagnostic of "imsiUnknown" shall be sent if the received AIA command contains an Experimental-Result AVP with a value of "User Unknown".

Values other than SUCCESS within the Result-Code / Experimental-Result AVP shall be mapped onto an appropriate MAP error.