MAC Address in Decimal Format for P-GW

This feature enables the SaMOG Gateway to encode the User Equipment's MAC address in the IMEISV IE value in decimal format, in order to support inter-operability with P-GW from third party vendors.

The following sections provide more detailed information:

Feature Description

During call establishment, the SaMOG Gateway encodes the UE MAC address in the IMEISV IE value to decimal format and sends the Create Session Request message with the encoded value to P-GW. This ensures inter-operability between SaMOG and some third party vendor's P-GW that requires the UE MAC address in decimal format.

This feature can be configured by enabling the decimal keyword in the samog-gtpv1 and samog-s2a-gtpv2 commands under the Call Control Profile Configuration Mode. For more configuration information, refer Configuring MAC Address Encoding.

How it Works

Architecture

The IMEI is a 15 digit decimal number that consists of a 14 digit value and 1 check digit, while the IMEISV field is a 16 digit decimal number that consists of a 14 digit value and 2 digit software version. The User Equipment's (UE) MAC address is a 6 byte or a 48 bit hexa-decimal value. As the maximum value of 6 bytes exceeds the 15 digit value in the IMEI field, 2 bits of the UE MAC address are removed and the remaining bits are left shifted. The SaMOG Gateway converts this value into decimal format and sends it to P-GW.

The following figure displays the bit representation and conversion of the MAC address:



The b1 bit represents the MAC address as unicast or multicast, and the b2 bit represents the MAC address as globally unique or locally administered.

Examples:

  • UE MAC Address: 8AF9ABD5C613

    After bits 1 and 2 are removed: 22F9ABD5C613

    Decimal converted value: 38455725114899

    TBCD encoded value (sent to P-GW): 83547552118499F0

  • UE MAC Address: FFFFFFFFFFFF

    After bits 1 and 2 are removed: 3FFFFFFFFFFF

    Decimal converted value: 70368744177663

    TBCD encoded value (sent to P-GW): 07637844716736F0

  • UE MAC Address: 0034567890AB

    After bits 1 and 2 are removed: 0034567890AB

    Decimal converted value: 224789041323

    TBCD encoded value (sent to P-GW): 00227498403132F0

Standards Compliance

The interface between the SaMOG Gateway and P-GW complies with the following 3GPP standards:

  • 3GPP TS 23.002

  • 3GPP TS 29.060

  • 3GPP TS 29.274

Configuring MAC Address Encoding in Decimal Format

Configuring MAC Address Encoding

Use the decimal keyword in the samog-gtpv1 and samog-s2a-gtpv2 commands under the Call Control Profile Configuration mode to enable SaMOG Gateway to encode the IMEI attribute in decimal format to send to P-GW. 

configure 
     call-control-profile profile_name 
         samog-gtpv1 send imeisv value ue-mac decimal 
         samog-s2a-gtpv2 send imeisv value ue-mac decimal 
        end

  • By default, SaMOG sends the IMEISV value in hexa-decimal format.

  • Use the no samog-gtpv1 send imeisv and no samog-s2a-gtpv2 send imeisv commands to disable decimal encoding.

  • For further information on the other command keywords and the use of the command prefixes, refer to the Command Line Interface Reference for Release 20.0.

Verifying Configuration

Use the show call-control-profile command to verify the configuration of this feature.

show call-control-profile full name profile_name 

Samog-GTPv1: 
    Sending IMEI(SV) IE                                                : Enabled 
    IMEI(SV) IE Value Type                                             : UE MAC in Decimal 
Samog-S2a-GTPv2: 
    Sending IMEI(SV) IE                                                : Enabled 
    IMEI(SV) IE Value Type                                             : UE MAC in Decimal