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Content for  TS 29.572  Word version:  17.6.0

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1  Scopep. 8

The present document specifies the stage 3 protocol and data model for the Nlmf Service Based Interface. It provides stage 3 protocol definitions and message flows, and specifies the API for each service offered by the LMF.
The 5G System stage 2 architecture and procedures are specified in TS 23.501 and TS 23.502.
The Technical Realization of the Service Based Architecture and the Principles and Guidelines for Services Definition are specified in TS 29.500 and TS 29.501.

2  Referencesp. 8

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 23.501: "System Architecture for the 5G System; Stage 2".
TS 23.502: "Procedures for the 5G System; Stage 2".
TS 29.500: "5G System; Technical Realization of Service Based Architecture; Stage 3".
TS 29.501: "5G System; Principles and Guidelines for Services Definition; Stage 3".
RFC 4776:  "Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6) Option for Civic Addresses Configuration Information".
RFC 5139:  "Revised Civic Location Format for Presence Information Data Format Location Object (PIDF-LO)".
TS 29.571: "5G System; Common Data Types for Service Based Interfaces; Stage 3".
TS 33.501: "Security architecture and procedures for 5G system".
RFC 6749:  "The OAuth 2.0 Authorization Framework".
TS 29.510: "Network Function Repository Services; Stage 3".
RFC 7540:  "Hypertext Transfer Protocol Version 2 (HTTP/2)".
RFC 8259:  "The JavaScript Object Notation (JSON) Data Interchange Format".
OpenAPI Initiative, "OpenAPI Specification Version 3.0.0",
RFC 7807:  "Problem Details for HTTP APIs".
TR 21.900: "Technical Specification Group working methods".
TS 22.071: "Location Services (LCS); Service description; Stage 1".
TS 29.002: "Mobile Application Part (MAP) specification".
TS 23.273: "5G System (5GS) Location Services (LCS); Stage 2".
TS 24.080: "Mobile radio interface layer 3 Supplementary services specification; Formats and coding".
TS 37.355: "LTE Positioning Protocol (LPP)".
TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
TS 29.518: "Access and Mobility Management Services".
TS 29.171: "Location Services (LCS); LCS Application Protocol (LCS-AP) between the Mobile Management Entity (MME) and Evolved Serving Mobile Location Centre (E-SMLC); SLs interface".
RFC 4119:  "A Presence-based GEOPRIV Location Object Format".
TS 33.256: "Security aspects of Uncrewed Aerial Systems (UAS)".

3  Definitions and abbreviationsp. 9

3.1  Definitionsp. 9

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Abbreviationsp. 9

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
Location Deferred Request
Location Management Function

4  Overviewp. 9

The Location Management Function (LMF) is the network entity in the 5G Core Network (5GC) supporting the following functionality:
  • Supports location determination for a UE.
  • Obtains downlink location measurements or a location estimate from the UE.
  • Obtains uplink location measurements from the NG RAN.
  • Obtains non-UE associated assistance data from the NG RAN.
  • Provides broadcast assistance data to UEs and forwards associated ciphering keys to an AMF.
Other functions of an LMF are listed in clause 4.3.8 of TS 23.273.
Figure 4-1 provides the reference model (in service based interface representation and in reference point representation), with focus on the LMF:
Copy of original 3GPP image for 3GPP TS 29.572, Fig. 4-1: Reference model - LMF
Figure 4-1: Reference model - LMF
(⇒ copy of original 3GPP image)

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