4 Functional Overview

29.1713GPPLCS Application Protocol (LCS-AP) between the Mobile Management Entity (MME) and Evolved Serving Mobile Location Centre (E-SMLC)Location Services (LCS)Release 17SLs interfaceTS

4.1 General

Figure 4.1-1 below shows the architecture applicable to the positioning of a UE with E-UTRAN access. The SLs interface is used to convey LCS-AP messages and parameters between the MME to the E-SMLC. It is also used for tunnelling LTE Positioning Protocols (LPP between the E-SMLC and the target UE, LPPa between the E-SMLC and the eNB), which are transparent to the MME as described in 3GPP TS 36.305 [2].

Figure 4.1-1 Positioning Interfaces in E-UTRAN