This feature enables the SaMOG Gateway to receive the last known LTE location of the subscriber in the 3GPP-User-Location-Info AVP from the Diameter-based AAA server over the STa interface. This information is then used by SaMOG in the Create Session Request (CSR) messages over the S2a interface. The 3GPP-User-Location-Info AVP is received by SaMOG when the aaa-custom23 dictionary is available.

With the 3GPP-User-Location-Info AVP, SaMOG can then:

• Use the PLMN values (MCC/MNC) in the Serving-Network IE in the CSR messages.

• Populate the User-Location-Information (ULI) IE in the CSR messages.

Important

The aaa-custom23 dictionary is customer specific. For more information, contact your Cisco account representative.

The AAA Server shares the last known LTE location of the subscriber through the Geographic Location Type field in the 3GPP-User-Location-Information AVP as specified in 3GPP TS 29.061:

• TAI – When the value of the Geographic Location Type field is 128, the Geographic Location field will contain the PLMN and Tracking Area Code (TAC) values.

• ECGI – When the value of the Geographic Location Type field is 129, the Geographic Location field will contain the PLMN and E-UTRAN Cell Identifier (ECI) values.

• TAI-ECGI – Value of the Geographic Location Type field is 130.

On receiving the 3GPP-User-Location-Info AVP from the AAA Server, SaMOG can do one or both of the following:

• When the samog-s2a-gtpv2 send uli command under the Call Control Profile Configuration mode is enabled,SaMOG populates the ULI IE in the Create Session Request message over the S2a interface.

• When the samog-s2a-gtpv2 send serving-network value uli command under the Call Control Profile Configuration Mode is enabled, SaMOG forwards the Serving-Network Information Element (IE) in the Create Session Request message over the S2a interface.

The structure of the ULI IE, and ECGI and TAI values are as specified in 3GPP TS 29.274.

The 3GPP-User-Location-Info AVP is non-standard over the STa interface, and ULI IE is non-standard over the S2a interface.

This feature complies with the following standards:

• 3GPP TS: 29.061 - “Interworking between the Public Land Mobile Network (PLMN) supporting packet based services and Packet Data Networks (PDN)”

• 3GPP TS: 29.274 - “3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3”

Use the following configuration to configure SaMOG to forward the User-Location-Information (ULI) Information Element (IE) in the CSR message over the S2a interface.

config 
    call-control-profile profile_name 
        samog-s2a-gtpv2 send uli 
        end 

Notes:

• Default: Disabled

• If previously configured, use the no samog-s2a-gtpv2 send uli command to disable the configuration.

Use the following configuration to configure SaMOG to forward the Serving-Network Information Element (IE) in the CSR message over the S2a interface.

config 
    call-control-profile profile_name 
        [ no ] samog-s2a-gtpv2 send serving-network value uli 
        end 

Notes:

• Default: Disabled

• If previously configured, use the no samog-s2a-gtpv2 send serving-network value uli command to disable the configuration.