Functional stage 2 description of Location Services (LCS)
The present document specifies the stage 2 of the LoCation Services (LCS) feature in UMTS, GSM and EPS (for E-UTRAN), which provides the mechanisms to support mobile location services for operators, subscribers and third party service providers.
Location Services in 5GC are restricted to regulatory services and are specified in TS 23.501 [54] and TS 23.502 [55] in this release of the specification. The architecture and signalling procedures in NG-RAN are defined in TS 38.305 [56].
The present document replaces the specifications TS 23.171 (Release 1999) and the system and core network parts of GSM 03.71 (Release 1999). TS 43.059 [16] replaces the radio access network parts of GSM 03.71 (Release 1999).
Location Services may be considered as a network provided enabling technology consisting of standardised service capabilities, which enable the provision of location applications. The application(s) may be service provider specific. The description of the numerous and varied possible location applications which are enabled by this technology are outside the scope of the present document. However, clarifying examples of how the functionality being described may be used to provide specific location services may be included.
This stage 2 service description covers the LCS system functional model for the whole system, the LCS system architecture, state descriptions, message flows, etc.