METHOD AND SYSTEM FOR CONTROLLING LOCATION UPDATE AND PAGING, CONSIDERING LOCATION CHARACTERISTICS OF MOBILE STATION IN A COMMUNICATION SYSTEM

• US 20090227265A1
• Filed: 02/27/2009
• Published: 09/10/2009
• Est. Priority Date: 03/04/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: JUNG, Jin-Kwan, KANG, Hyon-Goo
• Granted Patent: US 8,280,399 B2
• Time in Patent Office: Days
• US Class Current: 455/456.100
• CPC Class Codes: H04W 60/04 using triggered events

Abstract

A method and system for controlling a location update of a Mobile Station (MS) and paging the MS, taking into account location characteristics of the MS in a communication system are provided. The system for controlling the location update includes the MS for receiving a broadcasting message from a preferred BS during a PLI, for determining whether a paging group is changed, for verifying lazy location update information in the broadcasting message to delay a location update of the MS, if the paging group is changed and for updating a location of the MS according to the lazy location update information.

Claims

1. A location update method of a Mobile Station (MS) operating in an idle mode in a communication system, the method comprising:

receiving a broadcasting message from a preferred Base Station (BS) during a Paging Listening Interval (PLI);

determining whether a paging group is changed and, if the paging group is changed, verifying lazy location update information in the broadcasting message to delay a location update of the MS; and

updating a location of the MS according to the lazy location update information.

2. The method of claim 1, wherein the determining of whether the paging group is changed comprises comparing a last paging group Identifier (ID), that the MS is aware of, with a paging group ID included in the broadcasting message.

3. The method of claim 1, wherein the location updating comprises:

comparing the number of location update attempts of the MS with a threshold set in the lazy location update information, if the lazy location update information indicates a threshold-based location update; and

updating the location of the MS, if the number of location update attempts of the MS is equal to or greater than the threshold.

4. The method of claim 1, wherein the location updating comprises:

determining whether a predetermined time of a timer of the MS is expired, if the lazy location update information indicates a timer-based location update; and

updating the location of the MS, if the predetermined time is expired.

5. The method of claim 1, wherein the location updating comprises updating the location of the MS, if one of the lazy location update information is not included in the broadcasting message and the lazy location update information indicates that a lazy location update is not allowed to the MS.

6. A method for controlling a location update of a Mobile Station (MS) in a paging controller that manages at least one MS operating in an idle mode in a communication system, the method comprising:

determining a type of downlink data traffic for the MS, upon generation of the downlink data traffic during a Paging Listening Interval (PLI) of the MS operating in the idle mode;

generating lazy location update information for controlling a lazy location update of the MS, if the type of downlink data traffic is not real-time traffic; and

transmitting a broadcasting message including the lazy location update information to the MS through a preferred Base Station (BS) of the MS and paging the MS in accordance with the lazy location update information.

7. The method of claim 6, wherein the generating of the lazy location update information comprises determining if location characteristics of the MS comprise inertia in mobility.

8. The method of claim 6, wherein the lazy location update information comprises a first threshold and information indicating a location update when the number of location update attempts of the MS is greater than the first threshold.

9. The method of claim 6, wherein if the type of downlink data traffic is Best Effort (BE), the lazy location update information comprises information indicating a predetermined time and information indicating a location update when the predetermined time of a timer of the MS is expired.

10. The method of claim 6, wherein the paging of the MS comprises:

paging the MS during the PLI and determining whether the paging is successful;

determining a next PLI, if the paging failed and the number of paging re-attempts is equal to or greater than a second threshold; and

transmitting the next PLI to the MS through the preferred BS and re-attempting paging to the MS during the next PLI.

11. The method of claim 10, wherein the determining of the next PLI comprises:

selecting one of natural numbers equal to or less than a product between the number of paging re-attempts and the first threshold; and

determining the next PLI by adding a product between a cycle of the PLI and the selected natural number to a current frame.

12. The method of claim 10, wherein the determining of the next PLI comprises:

selecting one of natural numbers equal to or less than a product between 2^{the number of paging re-attempts} and the first threshold; and

determining the next PLI by adding a product between a cycle of the PLI and the selected natural number to a current frame.

13. The method of claim 6, wherein the lazy location update information comprises information indicating that a lazy location update is not allowed to the MS, if the type of downlink data traffic is real-time traffic.

14. A location update controlling system in a communication system, the location update controlling system comprising:

a Mobile Station (MS) for operating in an idle mode, for receiving a broadcasting message from a preferred Base Station (BS) during a Paging Listening Interval (PLI), for determining whether a paging group is changed, for verifying lazy location update information in the broadcasting message to delay a location update of the MS, if the paging group is changed and for updating a location of the MS according to the lazy location update information.

15. The location update controlling system of claim 14, wherein the MS determines whether the paging group is changed by comparing a last paging group Identifier (ID), that the MS is aware of, with a paging group ID included in the broadcasting message.

16. The location update controlling system of claim 14, wherein the MS compares a number of location update attempts of the MS with a threshold set in the lazy location update information, if the lazy location update information indicates a threshold-based location update and updates the location of the MS, if the number of location update attempts of the MS is equal to or greater than the threshold.

17. The location update controlling system of claim 14, wherein the MS determines whether a predetermined time of a timer of the MS is expired, if the lazy location update information indicates a timer-based location update and updates the location of the MS, if the a predetermined time is expired.

18. The location update controlling system of claim 14, wherein the MS updates the location of the MS, if one of the lazy location update information is not included in the broadcasting message and the lazy location update information indicates that a lazy location update is not allowed to the MS.

19. A location update controlling system in a communication system, the location update controlling system comprising a paging controller for controlling a location update of a Mobile Station (MS) operating in an idle mode,

wherein the paging controller comprises:

a call controller for determining a type of downlink data traffic for the MS, upon generation of the downlink data traffic during a Paging Listening Interval (PLI) of the MS;

a message generator for generating lazy location update information for controlling a lazy location update of the MS, if the type of downlink data traffic is not real-time traffic; and

a transmitter for transmitting a broadcasting message comprising the lazy location update information to the MS through a preferred Base Station (BS) of the MS and paging the MS in accordance with the lazy location update information.

20. The location update controlling system of claim 19, wherein the call controller controls the message generator to generate the lazy location update information, if location characteristics of the MS comprises inertia in mobility.

21. The location update controlling system of claim 19, wherein the call controller controls the message generator so that lazy location update information comprises a first threshold and information indicating a location update when a number of location update attempts of the MS is greater than the first threshold.

22. The location update controlling system of claim 19, wherein if the type of downlink data traffic is Best Effort (BE), the call controller controls the message generator so that the lazy location update information comprises information indicating a predetermined time and information indicating a location update when the predetermined time period of a timer of the MS is expired.

23. The location update controlling system of claim 19, wherein the call controller pages the MS during the PLI, determines whether the paging is successful, determines a next PLI if the paging failed and a number of paging re-attempts is equal to or greater than a second threshold, and controls the transmitter to transmit the next PLI to the MS through the preferred BS and to re-attempt paging to the MS during the next PLI.

24. The location update controlling system of claim 23, wherein the call controller selects one of natural numbers equal to or less than a product between the number of paging re-attempts and the first threshold, and determines the next PLI by adding a product between a cycle of the PLI and the selected natural number to a current frame.

25. The location update controlling system of claim 23, wherein the call controller selects one of natural numbers equal to or less than a product between 2^{the number of paging re-attempts} and the first threshold, and determines the next PLI by adding a product between a cycle of the PLI and the selected natural number to a current frame.

26. The location update controlling system of claim 19, wherein the call controller controls the message generator so that the lazy location update information comprises information indicating that a lazy location update is not allowed to the MS, if the type of downlink data traffic is real-time traffic.