APPARATUS AND METHOD FOR PAGING IN WIRELESS COMMUNCATION SYSTEM

• US 20120157145A1
• Filed: 09/29/2011
• Published: 06/21/2012
• Est. Priority Date: 12/21/2010
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: LEE, Namsuk, Lee, Sook Jin
• Granted Patent: US 8,515,464 B2
• Time in Patent Office: Days
• US Class Current: 455/515
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 68/025 Indirect paging
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A base station adds a paging message indicator representing a position of a frame to receive a paging advertisement message and a paging subgroup indicator representing a paging subgroup to which the paging advertisement message is to be transmitted to a PGID-INFO message and transmits the PGID-INFO message to a terminal, and the terminal determines whether a paging advertising message is to be transmitted using a paging message indicator and a paging subgroup indicator of the PGID-INFO message and a position of a frame to receive a paging advertisement message.

Claims

1. A method in which a base station performs paging of a terminal that enters an idle mode, the method comprising:

setting a paging message indicator representing a position of a frame to transmit a paging advertisement message and a paging subgroup indicator representing a paging subgroup to which the paging advertisement message is to be transmitted;

adding the paging message indicator and the paging subgroup indicator to a paging information (PGID-INFO) message and transmitting the PGID-INFO message to each terminal; and

transmitting the paging advertising message at a position of a corresponding frame.

2. The method of claim 1, further comprising receiving a paging group identifier and a deregistration identifier (DID) of each terminal before the setting of a paging message indicator,

wherein the PGID-INFO message comprises the paging group identifier and the DID.

3. The method of claim 2, wherein the setting of a paging message indicator comprises:

determining the position of the frame to transmit the paging advertisement message using a DID of each terminal having the paging group identifier; and

forming the paging message indicator by setting a bit value corresponding to the position of the frame to transmit the paging advertisement message to 1,

wherein bits of the paging message indicator correspond to a plurality of frames, respectively, that are used for paging.

4. The method of claim 3, wherein the transmitting of the paging advertising message comprises transmitting the paging advertisement message at a frame corresponding to the bit value 1.

5. The method of claim 3, wherein the determining of a position of a frame comprises determining a frame corresponding to a value that performs a modular operation of a DID of the terminal with a frame parameter value representing the number of the plurality of frames as the frame to transmit the paging advertisement message.

6. The method of claim 3, wherein the setting of a paging message indicator comprises:

dividing terminals to receive a paging advertisement message at one frame position into a plurality of paging subgroups;

determining a paging subgroup to which a terminal to receive the paging advertisement message belongs; and

forming the paging subgroup indicator by setting a bit value corresponding to a paging subgroup to which a terminal to receive the paging advertisement message belongs to 1 and setting a bit value corresponding to a paging subgroup to which a terminal to receive the paging advertisement message does not belong to 0,

wherein bits of the paging message indicator correspond to the plurality of subgroups, respectively.

7. The method of claim 6, wherein the dividing of terminals comprises:

obtaining a quotient by dividing a DID of each terminal to receive a paging advertisement message at one frame position by a frame parameter value representing the number of the plurality of frames;

performing a modular operation of the quotient with the number of the plurality of paging subgroups; and

comprising each terminal to receive the paging advertisement message at the one frame position in a paging subgroup corresponding to a value of the modular operation.

8. A method of paging in a terminal, the method comprising:

entering an idle mode;

receiving a PGID-INFO message comprising PGID-INFO from a base station;

determining a position of a frame to receive a paging advertisement message and whether the terminal belongs to a paging subgroup to which the paging advertisement message is to be transmitted using the PGID-INFO; and

receiving, if the terminal belongs to the paging subgroup to which the paging advertisement message is to be transmitted, the paging advertisement message at the position of a frame to receive the paging advertisement message.

9. The method of claim 8, wherein the PGID-INFO comprises a paging message indicator representing a position of a frame to receive a paging advertisement message and a paging subgroup indicator representing a paging subgroup to which the paging advertisement message is to be transmitted at one frame position.

10. The method of claim 9, wherein the PGID-INFO further comprises a DID, and

the determining of a position comprises:

calculating a position of a frame in which the terminal should receive a paging advertising message using a DID thereof; and

entering a power saving mode if a value of a bit corresponding to the position of the frame in which the terminal should receive the paging advertising message is 0 in the paging message indicator.

11. The method of claim 10, wherein the determining of a position further comprises:

determining, if a value of the bit corresponding to the position of the frame in which the terminal should receive the paging advertisement message is 1 in the paging message indicator, a value of a bit corresponding to a paging subgroup to which the terminal belongs in the paging subgroup indicator; and

entering a power saving mode if the value of the bit corresponding to the paging subgroup to which the terminal belongs is 0.

12. The method of claim 11, wherein the determining of a position further comprises determining, if the value of the bit corresponding to the paging subgroup to which the terminal belongs is 1, that the terminal belongs to the paging subgroup to which the paging advertisement message is to be transmitted.

13. The method of claim 11, wherein the determining of a value comprises:

obtaining a quotient by dividing a DID of the terminal by the number of frames that is used for paging;

performing a modular operation of the quotient with the number of a plurality of paging subgroups; and

determining a paging subgroup corresponding to a value by a modular operation as a subgroup to which the terminal belongs.

14. The method of claim 8, further comprising receiving the paging advertisement message and determining whether paging of the terminal exists.

15. A paging apparatus of a base station, the paging apparatus comprising:

an idle operation control unit that transmits PGID-INFO comprising a DID and a paging group identifier of a terminal entering an idle mode to a terminal; and

a paging control unit that forms a paging message indicator representing a position of a frame to transmit a paging advertising message using a DID of a terminal belonging to the paging group identifier, that adds the paging message indicator to a PGID-INFO message, that transmits the PGID-INFO message to the terminal, and that transmits the paging advertising message at the position of a frame to transmit the paging advertising message.

16. The paging apparatus of claim 15, wherein the paging control unit forms a paging subgroup indicator representing a paging subgroup to which the paging advertisement message is to be transmitted at a position of each frame to transmit the paging advertising message, adds the paging subgroup indicator to the PGID-INFO message, and transmits the PGID-INFO message to the terminal.

17. A paging apparatus of a terminal, the paging apparatus comprising:

a paging reception determining unit that receives a PGID-INFO message comprising a paging message indicator and a paging subgroup indicator from a base station, and that determines a position of a frame to receive a paging advertisement message and whether the terminal belongs to a paging subgroup to which a paging advertisement message is to be transmitted among a plurality of paging subgroups; and

a paging determining unit that receives the paging advertisement message if the terminal belongs to the paging subgroup to which the paging advertisement message is to be transmitted at a position of a corresponding frame, and that determines whether paging of the terminal exists.

18. The paging apparatus of claim 17, further comprising a mode conversion unit that converts a mode of the terminal to a power saving mode if the paging advertisement message to transmit to the terminal does not exist at the position of the corresponding frame.

19. The paging apparatus of claim 17, further comprising a mode conversion unit that converts a mode of the terminal to a power saving mode if the terminal does not belong to the paging subgroup to which the paging advertisement message is to be transmitted at the position of the corresponding frame.

20. The paging apparatus of claim 17, wherein the paging message indicator and the paging subgroup indicator are formed with bitmaps,

bits of the paging message indicator correspond to a plurality of frames, respectively, that are used for paging, and

bits of the paging message indicator correspond to the plurality of subgroups, respectively.