Section: 4.3.14 Location Service functions
Content: LCS procedures are described in the LCS stage 2 specification, see TS 23.271[ Functional stage 2 description of Location Services (LCS) ]  [57]. In addition, in the Detach and Bearer Deactivation procedures, the MME shall inform the S-GW of the last known location of the UE, and shall provide information to enable the determination of the time at which the UE was in that location. The S-GW shall (if necessary taking into account information from the SGSN) inform the PDN GW of the last known location of the UE, and shall provide information to enable the determination of the time at which the UE was in that location. If requested by the PCRF the PDN GW shall indicate this information to the PCRF as defined in TS 23.203[ Policy and charging control architecture ]  [6]. The information can also be made available on the SGi interface as specified in TS 29.061[ Interworking between the Public Land Mobile Network (PLMN) supporting packet based services and Packet Data Networks (PDN) ]  [38] and on the CDRs at network elements such as the S-GW and PDN GW as specified in TS 32.251[ Telecommunication management;Charging management;Packet Switched (PS) domain charging ]  [44].