My 33.127 Notes

5.4 LI Interfaces

5.4.13 Lawful Interception Identity Query Function (LI_IQF) Interface

LI_IQF is an interface between Lawful Interception Control Function (LICF) and Identity Query Function (IQF) and is used by the LICF to send management information related to Identity Event Functions (IEFs) and Identity Caching Function (ICF), to the IQF.

Further details about this interface is outside the scope of 33.127 V18.0.0 (2022-06) document.

5.4.14 Lawful Interception Internal Query Response (LI_XQR)

The LI_XQR interface is used by the IQF to send identifier association queries to the ICF and from the ICF to return identities associations to the IQF in response.

The following are examples of some of the information that may be passed over LI_XQR from the IQF to the ICF:

• Information relating to the type of query.
• Temporary or permanent identifier provided by the LEA.
• Other information associated with identifier required for localisation provided by the LEA.
  • Cell identity.
  • Tracking area identifier.
• Time that identifier provided by the LEA was observed by the LEA.
• Location information request from the LEA for permanent to temporary identifier association.

The following are examples of some of the information that may be passed over LI_XQR from the ICF to the IQF:

• Information relating to the type of query being responded to.
• Temporary and permanent identifiers corresponding to identifier provided by LEA.
• Identifier association validity start and end times.
• Location information.

NOTE: The location information returned in the IQF response is the information associated at the time of the specific identifier association caching at the ICF.

5.4.15 Lawful Interception Handover Interface Query Response (LI_HIQR) Interface

The Lawful Interception Handover Interface Query Response (LI_HIQR) interface is used by the Law Enforcement Agency (LEA) to send identifier association queries to the IQF and from the IQF to return identities associations to the LEA in response.

The following are examples of some of the information that may be passed over LI_HIQR from LEA to the IQF:

• Information relating to the type of query.
• Warrant/authorization identifier.
• Temporary or permanent identifier provided by the LEA.
• Other information associated with identifier required for localisation provided by LEA.
  • Cell identity.
  • Tracking area identifier.
• Time that identifier provided by LEA was observed by the LEA.
• Location information request for permanent to temporary identifier association.

The following are examples of some of the information that may be passed over LI_HIQR from IQF to the LEA:

• Information relating to the type of query being responded to.
• Warrant/authorization identifier.
• Temporary and permanent identifiers corresponding to identifier provided by LEA.
• Identifier association validity start and end times.
• Location information.

5.4.16 Interface LI_XER

The Lawful Interception Internal Event Record (LI_XER) interface is used by the IEF to send identifier association events to the ICF.

The following are examples of some of the information that may be passed over LI_XER from the IEF to the ICF:

• Permanent identifier and temporary identifier association.
• Permanent identifier and temporary identifier excommunication / de-association.
• Time stamp of association observation.
• Location information.

5.4.17 Interface LI_XEM1

The LI_XEM1 interface is used by the LICF (proxied by the LIPF) to manage and control the activation state of the IEF(s) and ICF.

LI_XEM1 interfaces shall support the use of ETSI TS 103 221-1 for transport of XEM1 messages / information. However, the requirements specified in the present document shall apply regardless of generic default options specified in ETSI TS 103 221-1.

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