Apparatus and method for transmitting coexistence beacon protocol in a cognitive radio system

1. An apparatus for Customer Premises Equipment (CPE) in a wireless communication system, the apparatus comprising:

a plurality of directional antennas;

a detector for scanning channels on which a plurality of neighboring Base Stations (BSs) operate, wherein the scanning uses the plurality of directional antennas;

a controller for linking one of the plurality of directional antennas with each of the plurality of neighboring BSs, respectively;

a transceiver for receiving a Coexistence Beacon Protocol (CBP) packet through one of the plurality of directional antennas linked with one of the respective neighboring BSs, and for transmitting the received CBP packet to at least one or more other of the plurality of neighboring BSs linked with at least one or more other of the plurality of directional antennas,

wherein the transceiver respectively transmits two or more received CBP packets to two or more of the plurality of the neighboring BSs, and

wherein the two or more CBP packets transmitted through the two or more of the plurality of directional antennas are synchronized using an independent system clock, if a distance between the apparatus and one of the neighboring BSs is different from a distance between the apparatus and another of the neighboring BSs.

2. The apparatus of claim 1 , wherein the controller controls transmission of information on the link between the one of the plurality of directional antennas and the one of the respective neighboring BSs, to other linked BSs.

3. The apparatus of claim 1 , wherein, when the link between the one of the plurality of directional antennas and the one of the respective neighboring BSs is interrupted, the controller reports the link interruption.

4. The apparatus of claim 1 , wherein the transceiver respectively transmits two or more received CBP packets to two or more of the plurality of the neighboring BSs and further wherein the two or more CBP packets transmitted through the two or more of the plurality of directional antennas are synchronized using a common system clock.

5. The apparatus of claim 1 , wherein the transceiver transmits a message to the plurality of neighboring BSs during at least one of initialization and after initialization to identify the apparatus.

6. A Base Station (BS) in a wireless communication system, the BS comprising:

a controller for permitting access of a Mobile Station (MS) according to a preset process, for determining if the MS includes a dedicated equipment transmitting a Coexistence Beacon Protocol (CBP) packet, and for gathering corresponding information from the dedicated equipment transmitting the CBP packet; and

a scheduler for scheduling CBP packet transmission depending on the corresponding information,

wherein, when there is a notification of a link with a neighboring BS from the dedicated equipment, link information is updated and a CBP packet is transmitted to a non-linked BS according to a preset process.

7. The BS of claim 6 , wherein the corresponding information comprises information on a link between the dedicated equipment, equipped with a plurality of directional antennas, and a neighboring BS.

8. The BS of claim 6 , wherein the determining of whether the MS includes the dedicated equipment transmitting the CBP packet comprises using one of a Media Access Control (MAC) address and a registration request/ranging request message and a dedicated ranging code.

9. A method for operating Customer Premises Equipment (CPE) comprising a plurality of directional antennas in a wireless communication system, the method comprising:

scanning channels on which a plurality of neighboring Base Stations (BSs) operate, using the plurality of directional antennas;

linking one of the plurality of directional antennas with each of the plurality of neighboring BSs, respectively; and

receiving at least one Coexistence Beacon Protocol (CBP) packet through one of the plurality of directional antennas respectively linked with one of the plurality of neighboring BSs, and transmitting the received at least one CBP packet to at least one or more other BSs linked with at least one or more other directional antennas,

wherein the receiving of the at least one CBP packet comprises receiving a plurality of CBP packets and the transmitting of the received at least one CBP packet comprises transmitting the plurality of received CBP packets through the plurality of directional antennas, and

wherein the transmitting of the plurality of received CBP packets comprises synchronizing the transmission of the plurality of received CBP packets using an independent system clock, if a distance between the CPE and one of the neighboring BSs is different from a distance between the CPE and another of the neighboring BSs.

10. The method of claim 9 , further comprising transmitting information on at least one of the plurality of links between the plurality of directional antennas and the corresponding plurality of BSs, to at least one of the other linked BSs.

11. The method of claim 9 , further comprising, when one or more of the respective links between the plurality of directional antennas and the plurality of neighboring BSs is interrupted, reporting the interruption.

12. The method of claim 9 , wherein the receiving of the at least one CBP packet comprises receiving a plurality of CBP packets, the transmitting of the received at least one CBP packet comprises transmitting the plurality of received CBP packets through the plurality of directional antennas, and further wherein the transmitting of the plurality of received CBP packets comprises synchronizing the transmission of the plurality of received CBP packets using a common system clock.

13. The method of claim 9 , further comprising transmitting a message to the plurality of neighboring BSs during at least one of initialization and after initialization.

14. An operation method of a Base Station (BS) in a wireless communication system, the method comprising:

permitting access of a Mobile Station (MS) according to a preset process;

identifying if the MS includes a dedicated equipment transmitting a Coexistence Beacon Protocol (CBP) packet;

if the MS is identified as the dedicated equipment, gathering corresponding information from the dedicated equipment transmitting the CBP packet;

scheduling CBP packet transmission according to the corresponding information;

when there is a notification of a link with a neighboring BS and the dedicated equipment transmitting the CBP packet, updating the link information; and

transmitting a CBP packet to a non-linked BS according to a preset process.

15. The method of claim 14 , wherein the corresponding information comprises information on a link between the dedicated equipment, equipped with a plurality of directional antennas, and a neighboring BS.

16. The method of claim 14 , wherein the identifying of the MS as the dedicated equipment transmitting the CBP packet comprises using one of a Media Access Control (MAC) address, and a registration request/ranging request message and a dedicated ranging code.