Step 1) to 2.
If the UE is in idle mode, the UE requests a radio connection setup and sends a CM Service Request indicating a request for call independent supplementary service to the VMSC/MSC server via RAN (CS domain). If the UE is in dedicated mode, the UE sends a CM Service Request on the already established radio connection. The VMSC/MSC server instigates authentication and ciphering if the UE was in idle mode or returns a CM Service Accept if the UE was in dedicated mode.
For PS domain, in UMTS, if the UE is in idle mode, the UE requests a PS signalling connection and sends a Service Request indicating signalling to the SGSN via RAN. If the UE already has PS signalling connection, the UE does not need to send the Service Request. Security functions may be executed. These procedures are described in TS 23.060
. In GSM this signalling step is not needed.
The UE sends an LCS MO-LR Invoke for periodic transfer of location to a third party LCS client. The UE shall include the periodic location related parameters (reporting interval and total number of reports). The UE shall also include the identity of the LCS client and may include the address of the GMLC through which the LCS client can be accessed. The UE may include a request for use of MO-LR Short Circuit (e.g. if the UE supports UE based positioning). The absence of an H-GMLC assigned LDR reference number in this case indicates that the request has not yet been authorized.
Step 4) to 7.
The request to initiate periodic location shall be transferred in succession from the MSC/SGSN to the V GMLC, H-GMLC, R-GMLC serving the LCS client and finally may be transferred to the LCS client. The periodic location parameters (reporting interval and number of reports) are included as well as any request for use of MO-LR Short Circuit. Any entity (MSC/SGSN, V GMLC, H GMLC, R GMLC and, if notified, LCS Client) is enabled to accept or refuse the request. In addition, if the request was accepted, any entity is free to reject use of MO-LR Short Circuit. If the request is accepted, a LDR reference number is assigned by the H GMLC.
Step 8) to 11.
The response transferred back to the MSC/SGSN shall indicate acceptance or rejection and whether MO LR short circuit (if requested) has been accepted. The response also includes the LDR reference number assigned by the H-GMLC and the H-GMLC address. The H-GMLC may include in the response a list of PLMNs and possibly associated radio access technologies, either prioritized or non-prioritized, in which subsequent location estimates must be obtained and an indication for each PLMN (and possibly each associated radio access technology) of whether periodic location in the RAN is supported. If no list is included, subsequent locations are restricted to the current serving PLMN only
The MSC/SGSN returns the result of the request to the UE in a LCS MO-LR Return Result message including the LDR reference number, the H-GMLC address any reporting PLMN list and an indication whether MO-LR Short Circuit is allowed (if requested by the UE in step 3.
The UE may instigate release of the CM, MM/GMM and radio connections - e.g. if the request was rejected or if the MSC/SGSN provided a list of PLMNs that did not include the serving PLMN (or if the serving PLMN was included in a prioritized list with a lower priority). Assuming the request was accepted, the UE may then initiate reporting of the first location estimate using the procedure described in clause 18.104.22.168
and beginning at step 1.
If the request was accepted and the serving PLMN can be used for subsequent location, the UE may initiate reporting of the first location estimate by sending an MO-LR request indicating transfer of location to the LCS Client using the procedure described in clause 22.214.171.124
and beginning at step 3.