Patent ID: 8121611

Claim:
A SUPL (Secure User Plane Location) Enabled Terminal (SET)-initiated area event triggered positioning method in a mobile communication system, the SET having a SUPL Agent, the method comprising: receiving, by a first server, a SUPL TRIGGERED START message from a SET to start a trigger session, the SUPL TRIGGERED START message including a session-id, SET capabilities, a trigger type indicator, a location identifier (lid), and trigger parameters, wherein the trigger type indicator indicates an area event, and wherein the trigger parameters include trigger conditions indicating a change area type and an event area related to an area event triggered positioning, the change area type indicating one of entering, leaving, or staying at the event area; verifying, by the first server, whether the SET is roaming; sending, by the first server, a RLP message that includes the SUPL TRIGGERED START message to a second server after the SET is verified to be roaming; receiving, by the first server, a RLP message that includes a SUPL TRIGGERED RESPONSE message from the second server, the SUPL TRIGGERED RESPONSE message including area ids that represent ids of cells that belong to an area that has been requested to be positioned by the SET; sending, by the first server, the SUPL TRIGGERED RESPONSE message to the SET, the SUPL TRIGGERED RESPONSE message including a session-id, a positioning method, and the received area ids; receiving, from the SET, a POS INIT message to allow the SET to start a positioning session with the second server when a current area-id and one of the area ids correspond to each other, wherein the POS INIT message includes a session-id, lid, and SET capabilities; sending, to the second server, a RLP SSRP message that includes the SUPL POS INIT message; receiving, from the second server, a RLP SSRP message that includes a SUPL REPORT message, wherein the SUPL REPORT message includes a positioning result; sending, to the SET, the SUPL REPORT message including a session-id and the positioning result, whereby the SET then checks whether at least one of the trigger conditions included in the trigger parameters has been satisfied, based on a result of comparing the positioning result with the at least one of the trigger conditions included in the trigger parameters for the area event triggered positioning with respect to the entering, leaving, or staying at the event area indicated by the change-area type; and receiving, from the SET, a SUPL END message, wherein the first server is a H-SLP (Home SUPL Location Platform) and the second server is a V-SLP (Visited SUPL Location Platform), and wherein the trigger parameters include the area ids that represent one of ids of cells that belong to mobile country codes (MCC) and primary scrambling code numbers.