LOCATION POSITIONING METHOD IN HANDOVER BETWEEN NETWORKS

• US 20080200182A1
• Filed: 12/31/2007
• Published: 08/21/2008
• Est. Priority Date: 03/24/2006
• Status: Active Grant

• Current Assignee: Dong-Hi Shim
• Original Assignee: Dong-Hi Shim
• Inventors: SHIM, Dong-Hi
• Granted Patent: US 8,229,420 B2
• Time in Patent Office: Days
• 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 and terminal based on an area event in handover between networks. The method according to one embodiment includes: 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 mobile terminal for providing a location positioning service for a target area, comprising:

a controller configured to request a SUPL position initiation request message to a server of a first network during an on going periodic or area event session with a second network, to receive a SUPL end message from the first network server including a parameter indicating that a reason for sending the SUPL end message is no coverage, and to transmit a SUPL triggered start message to the first network server, the SUPL triggered start message including a parameter indicating a cause for sending the SUPL triggered start message is no coverage,

the controller configured to receive a SUPL triggered response message including at least one new trigger parameter associated with a third network from the first network server, and to continue to perform a periodic or area event session with the third network using the received at least one new trigger parameter.

2. The mobile terminal of claim 1, wherein the SUPL position initiation request message includes a session identifier and a location identifier associated with the mobile terminal.

3. The mobile terminal of claim 1, wherein the SUPL triggered start message further includes a session identifier, a location identifier, and capability information of the mobile terminal.

4. The mobile terminal of claim 1, wherein the at least one new trigger parameter includes new cell ids associated with the target area under the third network.

5. A SUPL server associated with a first network of a mobile terminal for providing a location positioning service, comprising:

a controller configured to receive a SUPL position initiation request message from the mobile terminal during an on going periodic or area event session between a second network and the mobile terminal, to transmit a SUPL end message including a parameter indicating that a reason for sending the SUPL end message is no coverage, and to receive a SUPL triggered start message from the mobile terminal, the SUPL triggered start message including a parameter indicating that a cause for sending the SUPL triggered start message is no coverage,

the controller configured to transmit a SUPL triggered response message including at least one new trigger parameter associated with a third network to the mobile terminal, wherein the at least one new trigger parameter is used to perform a periodic or area event session with the third network.

6. The SUPL server of claim 5, wherein the controller transmits a session initiation request message to a server of the second network in response to the SUPL position initiation request message, and receives a response message from the second network server, the response message including a parameter indicating that a reason for sending the response message is no coverage.

7. The SUPL server of claim 6, wherein in response to the SUPL triggered start message, the controller determines the third network based on location identification information associated with the mobile terminal.

8. The SUPL server of claim 7, wherein the controller transmits a triggered message including area information associated with a target area to a server of the third network, and receives the at least one new trigger parameter from the third network server, the received at least one new trigger parameter including new cell ids associated with the target area under the third network.

9. A mobile terminal for providing a location positioning service for a target area, comprising:

a controller configured to request a SUPL position initiation request message to a visited positioning center of a second network currently serving the mobile terminal during an on going periodic or area event session, and to receive a SUPL end message from the visited positioning center, the SUPL end message including a parameter indicating that a reason for sending the SUPL end message is no coverage,

the controller configured to transmit a SUPL triggered start message to a server of a first network of the mobile terminal, to receive a SUPL triggered response message including at least one new trigger parameter associated with a third network, and to continue to perform a periodic or area event session with the third network using the received at least one new trigger parameter.

10. The mobile terminal of claim 9, wherein the SUPL position initiation request message includes a session identifier and a location identifier associated with the mobile terminal.

11. The mobile terminal of claim 10, wherein the SUPL triggered start message further includes a session identifier, a location identifier, and capability information of the mobile terminal.

12. The mobile terminal of claim 11, wherein the at least one new trigger parameter included in the SUPL triggered response message includes new cell ids associated with the target area under the third network.

13. A SUPL server associated with a first network of a mobile terminal for providing a location positioning service, comprising:

a controller configured to receive a SUPL triggered start message from the mobile terminal when the mobile terminal is roaming in a second network, the SUPL triggered start message including a parameter indicating that a cause for sending the SUPL triggered start message is no coverage,

the controller configured to determine a third network based on location identification information of the mobile terminal, to obtain the at least one new trigger parameter from a location center of the third network, and to transmit a SUPL triggered response message including the obtained at least one new trigger parameter to the mobile terminal, wherein the at least one new trigger parameter is used to perform a periodic or area event session with the third network.

14. The SUPL server of claim 13, wherein to obtain the at least one new trigger parameter, the controller transmits a triggered message including area information associated with a target area to the location center of third network, and receives the at least one new trigger parameter from the location center of the third network, the received at least one new trigger parameter including new cell ids associated with the target area under the third network.

15. A method for providing an area event session with a mobile terminal capable of providing a SUPL service, comprising:

performing, by the mobile terminal, an ongoing periodic or area event session with a second network currently serving the mobile terminal;

transmitting, by the mobile terminal, a SUPL position initiation request message to a server of a first network during the ongoing periodic or area event session;

receiving, by the mobile terminal, a SUPL end message from the first network server, the SUPL end message including a parameter indicating that a reason for sending the SUPL end message is no coverage;

transmitting, by the mobile terminal, a SUPL triggered start message to the first network server, the SUPL triggered start message including a parameter indicating that a cause for sending the SUPL triggered start message is no coverage;

receiving, by the mobile terminal, a SUPL triggered response message from the first network server, the SUPL triggered response message including at least one new trigger parameter associated with a third network; and

performing a periodic or area event session with the third network using the received at least one new trigger parameter.

16. A method for providing an area event session with a mobile terminal capable of providing a SUPL service, comprising:

performing an ongoing periodic or area event session with a second network currently serving the mobile terminal;

receiving, by a server of a first network, a SUPL position initiation request message from the mobile terminal during the on going periodic or area event session;

transmitting, by the first network server, a SUPL end message to the mobile terminal, the SUPL end message including a parameter indicating that a reason for sending the SUPL end message is no coverage;

receiving, by the first network server, a SUPL triggered start message from the mobile terminal, the SUPL triggered start message including a parameter indicating that a cause for sending the SUPL triggered start message is no coverage;

in response to the SUPL triggered start message, determining, by the first network server, a third network to serve the mobile terminal based on location identification information associated with the mobile terminal;

transmitting, by the first network server, a SUPL triggered response message to the mobile terminal, the SUPL triggered response message including at least one new trigger parameter associated with the third network; and

performing a periodic or area event session with the third network using the at least one new trigger parameter.

17. The method of claim 16, further comprising:

transmitting, by the first network server, a session initiation request message to a server of the second network in response to the SUPL position initiation request message; and

receiving, by the first network server, a response message to the session initiation request message from the second network server, the response message including a parameter indicating that a reason for sending the response message is no coverage.

18. The method of claim 17, further comprising:

after the determining step, transmitting, by the first network server, a triggered message including area information associated with a target area to a server of the third network; and

receiving, by the first network server, the at least one new trigger parameter associated with the third network from the third network server.

19. A method for providing an area event session with a mobile terminal capable of providing a SUPL service, comprising:

performing, by the mobile terminal, an ongoing periodic or area event session with a second network currently serving the mobile terminal;

transmitting, by the mobile terminal, a SUPL position initiation request message to a positioning center of the second network during the on going periodic or area event session;

receiving, by the mobile terminal, a SUPL end message from the positioning center of the second network, the SUPL end message including a parameter indicating that a reason for sending the SUPL end message is no coverage;

transmitting, by the mobile terminal, a SUPL triggered start message to a server of a first network, the SUPL triggered start message including a parameter indicating that a cause for sending the SUPL triggered start message is no coverage;

receiving, by the mobile terminal, a SUPL triggered response message from the first network server, the SUPL triggered response message including at least one new trigger parameter associated with a third network; and

performing a periodic or area event session with the third network using the received at least one new trigger parameter.

20. A method for providing an area event session with a mobile terminal capable of providing a SUPL service, comprising:

performing an ongoing periodic or area event session with a second network currently serving the mobile terminal;

receiving, by a server of a first network, a SUPL triggered start message from the mobile terminal, the SUPL triggered start message including a parameter indicating that a cause for sending the SUPL triggered start message is no coverage;

in response to the SUPL triggered start message, determining, by the first network server, a third network to serve the mobile terminal based on location identification information associated with the mobile terminal;

transmitting, by the first network server, a SUPL triggered response message to the mobile terminal, the SUPL triggered response message including at least one new trigger parameter associated with the third network; and

performing a periodic or area event session with the third network using the at least one new trigger parameter.

21. The method of claim 20, further comprising:

after the determining step, transmitting, by the first network server, a triggered message to a location center of the third network, the triggered message including area information associated with a target area; and

receiving, by the first network server, the at least one new trigger parameter associated with the third network from the location center of the third network server.