Location positioning method in handover between networks

• US 8,019,355 B2
• Filed: 03/23/2007
• Issued: 09/13/2011
• Est. Priority Date: 03/24/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Shim, Dong-Hi
• Primary Examiner(s): DESIR, PIERRE LOUIS
• Application Number:
  US11/727,132
• Publication Number:
  US 20070243885A1
• Time in Patent Office: 1,635 Days
• Field of Search: 455/452.1, 455/452.2, 455/456.1, 455/456.2, 455/456.3, 455/456.5, 455/456.6, 340/539.13
• US Class Current: 455/456.1
• CPC Class Codes: H04L 67/52 specially adapted for the location of the user terminal
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/20 Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
• CPC Class Codes: H04W 60/04 using triggered events
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

Disclosed is a location information system based upon a SUPL (Secure User Plane Location) architecture, and more particularly, to a location positioning method based on an area event in handover between networks. The method comprises: if a network is changed or if a terminal is outside of the coverage area of a serving network while an area event is ongoing, requesting, by the terminal, new event trigger parameters to a home network through a first message; determining, by the home network, a serving network of the terminal by using location identifier included in the first message; receiving, the home network, the location identifier of a target area for which the positioning is requested from the determined serving network; and transmitting, the home network, the new event trigger parameters including the area identifier to the terminal through a second message.

Claims

1. A method of performing a location positioning service, the method comprising:

performing an area event session with a SUPL enabled terminal (SET);

receiving from the SET, a SUPL Triggered Start message that includes a cause for re-sending the SUPL Triggered Start message, a session-id, SET capabilities, and a location identifier;

finding a visited SUPL location platform (V-SLP) for a session establishment according to the cause for re-sending the SUPL Triggered Start message, using the location identifier included in the received SUPL Triggered Start message;

transmitting to the V-SLP, the SUPL Triggered Start message through use of a RLP request message;

receiving from the V-SLP, a SUPL Triggered Response message through use of a RLP answer message;

transmitting to the SET, the SUPL Triggered Response message that a session-id, a positioning method, and area event trigger parameters, the area event trigger parameters including one or more new cell ids of a specified area for the area event session;

continuing to perform the area event session with the SET using the one or more new cell ids of the specified area for the area event session included in the area event trigger parameters included in the sent SUPL Triggered Response message; and

receiving from the SET, a calculated positioning result when an area event occurs based on the one or more new cell ids of the specified area.

2. The method of claim 1, wherein the performing step comprises:

receiving from a SUPL Agent, a Mobile Location Protocol Triggered Location Reporting Request (MLP TLRR) message, that includes at least an MS-id, a client-id, and a TLRR event; and

sending to the SUPL Agent, the calculated positioning result received from the SET.

3. The method of claim 1, wherein the performing step comprises:

sending to the SET, a SUPL NIT message to initiate an area event trigger session, the SUPL INIT message including at least a session-id, a trigger type indicator, and a positioning method; and

receiving from the SET, a SUPL Triggered Start message to start the area event trigger session, the SUPL Triggered Start message including at least a session-id, lid, and SET capabilities.

4. The method of claim 1, further comprising:

receiving from the SET, a SUPL POS NIT message to allow the SET to start a positioning session with the V-SLP when a current cell-id and one of the one or more new cell ids correspond to each other, wherein the SUPL POS INIT message includes at least a session-id, lid, and SET capabilities.

5. The method of claim 4, further comprising:

calculating the positioning result in cooperation with the SET by exchanging positioning procedure messages.

6. The method of claim 1, wherein the SUPL Triggered Start message includes area event information.

7. The method of claim 1, further comprising:

sending to the SET, a SUPL END message when the area event session ends.

12. The method of claim 1, wherein in the step of receiving from the V-SLP, a SUPL Triggered Response message through use of a RLP answer message, the received SUPL Triggered Response message includes the one or more cell ids of the specified area for the area event session.

8. A method of performing a location positioning service by a SUPL enabled terminal (SET), the method comprising:

performing an area event session with a home SUPL location platform (H-SLP);

receiving from the H-SLP, a first SUPL Triggered Response message that includes a session-id, a positioning method, and trigger parameters;

comparing a current cell-id with a new cell-id forwarded from the H-SLP;

sending to the H-SLP, a SUPL Triggered Start message if a result of the comparing step indicates a network change, the SUPL Triggered Start message including a cause for re-sending the SUPL Triggered Start message, a session-id, SET capabilities, and a location identifier;

receiving from the H-SLP in response to the SUPL Triggered Start message, a second SUPL Triggered Response message that includes a session-id, a positioning method, and area event trigger parameters, the area event trigger parameters including one or more new cell ids of a specified area for the area event session;

continuing to perform the area event session with the H-SLP using the one or more new cell ids of the specified area for the area event session included in the area event trigger parameters included in the received second SUPL Triggered Response message;

calculating the positioning result in cooperation with the H-SLP by exchanging positioning procedure messages; and

reporting to the H-SLP, a calculated positioning result when an area event occurs based on the one or more new cell ids of the specified area.

9. The method of claim 8, wherein the performing step comprises:

receiving from the H-SLP, a SUPL INIT message to initiate an area event trigger session, the SUPL INIT message including at least a session-id, a trigger type indicator, and a positioning method; and

sending to the H-SLP, a SUPL Triggered Start message to start the area event trigger session, the SUPL Triggered Start message including at least a session-id, lid, and SET capabilities.

10. The method of claim 8, further comprising:

sending to the H-SLP, a SUPL POS INIT message to start a positioning session with a visited SUPL location platform (V-SLP), when a current cell-id and one of the one or more new cell ids correspond to each other, wherein the SUPL POS INIT message includes at least a session-id, lid, and SET capabilities.

11. The method of claim 10, wherein the area event occurs if the SET moves into a target area, moves out of the target area, or is within the target area.