7.12 Trace Management Messages

29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 16Stage 3TS

7.12.1 Trace Session Activation

The Trace Session Activation message shall be sent on S11/S4 by the MME/SGSN to the SGW, on S2a/S2b by the TWAN/ePDG to the PGW, and on S5/S8 by the SGW to the PGW when session trace is activated for a particular IMSI or IMEI for a UE that is attached and active or attached and idle.

Table 7.12.1-1 specifies the presence of the IEs in the message.

Table 7.12.1-1: Information Elements in a Trace Session Activation

Information elements

P

Condition / Comment

IE Type

Ins.

IMSI

C

The MME/SGSN shall include the IMSI in the message on the S11/S4 interface except for the case:

– If the UE is emergency or RLOS attached and the UE is UICCless.

The IMSI shall be included in the message on the S11/S4 interface but not used as an identifier

– if UE is emergency or RLOS attached but IMSI is not authenticated.

The SGW shall forward this IE to the PGW on S5/S8 if received on S11/S4.

The TWAN/ePDG shall include this IE on the S2a/S2b interface except for the case:

– If the UE is emergency attached and the UE is UICCless.

The IMSI shall be included in the message on the S2a/S2b interface if available, but not used as an identifier

– if UE is emergency attached but IMSI is not authenticated.

IMSI

0

Trace Information

M

Trace Information

0

ME Identity (MEI)

C

The MME/SGSN shall include the ME Identity (MEI) IE on the S11/S4 interface:

– If the UE is emergency attached and the UE is UICCless; or

– If the UE is emergency attached and the IMSI is not authenticated.

In other cases, the MME shall include the ME Identity (MEI) IE on the S11 interface, if available.

The SGW shall forward this IE to the PGW on S5/S8 if received on S11/S4.

MEI

0

CO

The MME/SGSN shall include the ME Identity (MEI) IE on the S11 interface:

– If the UE is RLOS attached and the UE is UICCless; or

– If the UE is RLOS attached and the IMSI is not authenticated.

CO

The TWAN/ePDG shall include the ME Identity (MEI) IE on the S2a/S2b interface:

– If the UE is emergency attached and the UE is UICCless

– If the UE is emergency attached and the IMSI is not authenticated

In other cases, the TWAN/ePDG shall include the ME Identity (MEI) IE on the S2a/S2b interface, if available.

7.12.2 Trace Session Deactivation

The Trace Session Deactivation message shall be sent on S11/S4 by the MME/SGSN to the SGW, on S2a/S2b by the TWAN/ePDG to the PGW, and on S5/S8 by the SGW to the PGW when session trace is deactivated for a particular IMSI or IMEI for a UE that is attached and active or attached and idle.

Table 7.12.2-1 specifies the presence of the IEs in the message.

Table 7.12.2-1: Information Elements in a Trace Session Deactivation

Information elements

P

Condition / Comment

IE Type

Ins.

Trace Reference

M

Trace Reference

0