9.1.11 Packet Switched Post Positioning Notification and Verification Procedure

23.2713GPPFunctional stage 2 description of Location Services (LCS)Release 17TS

Figure 9.11 illustrates the post positioning notification and verification procedure.

Figure 9.11: PS Post Positioning Notification and Verification Procedure

1) Common PS and CS MT-LR procedure as described in clause 9.1.1.

2) The GMLC sends a Provide Subscriber Location message to the SGSN with an indication of "notification only". This message carries the UE subscriber’s IMSI. For a session related location request, the message also carries the APN-NI to which the user has established the session. For a value added LCS client, the message shall carry the client name, the external identity of the LCS client and the Requestor Identity (if that is both supported and available), optionally the message may also carry the Service Type. Also the message may carry the type of the LCS client name and also the type of the Requestor identity if the requestor identity was included. If the result of the privacy check at H-GMLC/PPR indicated that the codeword shall be sent to the UE user, the message may carry also the codeword received from the LCS client. For a PLMN operator LCS client, the message shall carry the internal identity of the LCS client. If the Requestor Identity is provided, the GMLC shall send it as separate information. In addition, in order to display the requestor identity in case of pre Rel-5 network elements (i.e. SGSN and/or UE), the requestor identity may be also added to the LCS client name by the GMLC. When the Requestor identity is added to the LCS client name the practice described in the Annex D should be followed.

3) The SGSN determines a required privacy related action as described in Annex A.3 based on the indicators of privacy related action in the PSL message from the GMLC. If the UE is in idle mode, the SGSN performs paging. The paging procedure is defined in TS 23.060 [15].

4) Security functions may be executed. These procedures are defined in TS 23.060 [15].

5) A notification invoke message is sent to the target UE indicating a location type of notification and verification only, the identity of the LCS client and the Requestor Identity (if that is both supported and available), whether privacy verification is required. Also the message may indicate the type of the LCS client name and also the type of the Requestor identity if the requestor identity was included. Moreover, the message may carry also the service type and the codeword.

6) The target UE notifies the UE user of the location request and, if privacy verification was requested, waits for the user to grant or withhold permission. The UE then returns a notification result to the SGSN indicating, if privacy verification was requested, whether permission is granted or denied. If the UE user does not respond after a predetermined time period, the SGSN shall infer a "no response" condition. The SGSN shall return an error response to the GMLC if privacy verification was requested and either the UE user denies permission or there is no response with the UE subscription profile indicating barring of the location request.

7) The SGSN returns the indication of successful notification and verification result, if it has received a LCS Location Notification Return Result indicating that permission is granted. If a LCS Location Notification Return Result message indicating that permission is not granted is received, or there is no response, with the requested privacy action or the UE subscription profile indicating barring of location, the SGSN shall return an error response to the GMLC.

8) Common MT-LR procedure in PS and CS domain as described in clause 9.1.1.