Method of paging using header

1. A method for efficiently paging a terminal of an idle mode, the method comprising:

allocating an identifier of a large paging group and an identifier of a specific one of small paging groups included in the large paging group to a broadcast channel region;

transmitting a header including the broadcast channel region to the terminal;

paging the terminal by using the identifier of the specific one of small paging groups; and

paging the terminal by using the identifier of a large paging group when the terminal has performed a pre-determined number of location updates.

2. The method of claim 1 , wherein the broadcast channel region includes a primary broadcast channel (PBCH) having network common information allocated thereto and a secondary broadcast channel (SBCH) having cell specific information allocated thereto.

3. The method of claim 2 , wherein the large paging group paging information is allocated to the primary broadcast channel and wherein the small paging group paging information is allocated to the secondary broadcast channel.

4. The method of claim 2 , wherein if a plurality of large paging groups exist on a prescribed network, at least one of the large paging group identifier and the small paging group identifier is allocated to the secondary broadcast channel.

5. The method of claim 4 , wherein at least one of a large paging indicator and a small paging indicator is further allocated to the secondary broadcast channel.

6. The method of claim 1 , wherein the broadcast channel region comprises a first region using a single frequency network (SFN) and a second region including cell specific information.

7. The method of claim 6 , wherein the first region includes the large paging group identifier and wherein the second region includes the small paging group identifier.

8. The method of claim 7 , wherein the second region further comprises a paging group change flag indicating a paging group change of the terminal.

9. The method of claim 1 , further comprising the step of receiving a ranging request message including an identifier of the specific small paging group from the terminal,

wherein the ranging request message is transmitted for a location update.

10. The method of claim 1 , wherein the header is a superframe header.

11. A method of efficiently paging for a mobile station in idle mode, the method comprising:

receiving a header including a broadcast channel region including an identifier of a large paging group and an identifier of a specific one of small paging groups included in the large paging group;

transmitting a message including the identifier of the specific small paging group; and

performing a location update when the mobile station is moved to a region corresponding to a different small paging group among the small paging groups from a region corresponding to the specific small paging group;

wherein if the mobile station has performed a pre-determined number of location updates within the large paging group, the mobile station performs a next location update when the large paging group changes.

12. The method of claim 11 , wherein the broadcast channel region includes a primary broadcast channel (PBCH) to which information used in common for the large paging group is allocated and a secondary broadcast channel (SBCH) to which information used for a prescribed cell in the large paging group is allocated.

13. The method of claim 12 , wherein the large paging group paging information is allocated to the primary broadcast channel and wherein the small paging group paging information is allocated to the secondary broadcast channel.

14. The method of claim 12 , wherein if a plurality of large paging groups exist on a prescribed network, at least one of the large paging group identifier and the small paging group identifier is allocated to the secondary broadcast channel.

15. The method of claim 14 , wherein at least one of a large paging indicator and a small paging indicator is further allocated to the secondary broadcast channel.

16. The method of claim 11 , wherein the broadcast channel region comprises a first region using a single frequency network (SFN) and a second region including cell specific information.

17. The method of claim 16 , wherein the first region includes the large paging group identifier and wherein the second region includes the small paging group identifier.

18. The method of claim 17 , wherein the second region further comprises a paging group change flag indicating a paging group change of a terminal.

19. The method of claim 11 , wherein the header is a superframe header.

20. The method of claim 11 , wherein the message is a ranging message and wherein the ranging message is transmitted for a terminal to perform a location update.