KR101478260B1 - Apparatus and method for self coexistence window determining in wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for determining a self coexistence window for transmitting a coexistence beacon protocol packet in a wireless communication system, The method comprising the steps of: confirming SCWs occupied by neighbor base stations using CBP packets provided from at least one neighbor base stations through self-coexistence areas allocated in a first interval; Receiving a CBP packet of the neighbor BSs through at least one SCW among the SCWs occupied by the neighbor BSs during the second interval; A process of transmitting data through at least one SCW that does not transmit / receive a CBP packet with base stations And there is an advantage that can transmit a coexistence beacon protocol packets without errors.

Cognitive radio, coexistence beacon protocol, self-coexistence window, announcement interval,

Description

[0001] APPARATUS AND METHOD FOR SELF COEXISTENCE WINDOW DETERMINING IN WIRELESS COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wireless communication system using a cognitive radio function, and more particularly, to an apparatus and method for smoothly exchanging information between base stations using a wireless cognitive function in the wireless communication system.

With the development of wireless communication technology, systems using various communication methods coexist. For example, a system that uses a code division multiple access scheme called a second generation technology, a system that uses an IMT (International Mobile Telecommunication) -2000 scheme called a third generation technology, and an orthogonal system called a fourth generation technology Systems using an Orthogonal Frequency Division Multiplexing scheme coexist. At this time, the coexistent systems using different communication methods provide services using different frequency bands.

However, the frequency resource for wireless communication is limited. Therefore, there arises a problem that the frequency resources are insufficient for systems using various types of communication methods to coexist.

Therefore, a wireless cognitive technology for sensing and using a frequency band or channel that is not actually used among frequency bands already allocated and in use is being studied. For example, frequency bands allocated to transmit TV signals of 1 GHz or less exist in frequency bands that are not partially used. Accordingly, the wireless communication system using the wireless cognitive intelligence detects a partially unused channel in a frequency band allocated for transmitting a TV signal, and provides a service to terminals located in a service area.

The base stations of the wireless communication system using the wireless cognitive function do not share the communication information through the backbone. Therefore, the base stations using the wireless cognitive function share the communication information using the CBP packet. At this time, the BSs transmit and receive CBP packets through the SCW slots allocated to the latter half or the end of each frame.

As described above, the base stations using the wireless cognitive function share the communication information through the CBP packet transmitted / received through the SCW slot. Therefore, when a base station is initialized or a base station using the same frequency band as neighboring base stations is added, the base station to be initialized and the base station to be added must determine the SCW slot to transmit its CBP packet by monitoring the channels of the neighbor base stations .

However, in the wireless communication system, a specific scheme for occupying the SCW slot between the base stations and transmitting the CBP packet is not presented, so communication information between the base stations can not be shared. For example, when two base stations using the same frequency occupy the same SCW slot, there is a problem that CBP packets transmitted by the base stations collide and the BSs can not share the communication information. Also, when the CBP packet collides, a problem arises that the base station to be initialized and the base station to be added can not identify the SCW slot occupied by the neighbor base stations.

Accordingly, it is an object of the present invention to provide an apparatus and method for controlling efficient information exchange between base stations using a cognitive radio function in a wireless communication system.

It is another object of the present invention to provide an apparatus and a method for reducing interference of Coexistence Beacon Protocol packets between adjacent base stations in a wireless communication system using a wireless cognitive function

It is another object of the present invention to provide an apparatus and method for determining a self-coexistence window for transmitting a coexistence beacon protocol in a base station of a wireless communication system using a wireless cognitive function

It is another object of the present invention to provide an apparatus and method for base stations of a wireless communication system using a wireless cognitive function to share self-coexistence region information transmitting a coexistence beacon protocol packet.

According to a first aspect of the present invention, there is provided a method for transmitting a coexistence beacon protocol packet in a wireless communication system, the method comprising the steps of: The method comprising the steps of: checking SCWs occupied by the neighbor BSs using CBP packets provided from at least one neighbor BS through coexistence zones; and transmitting CBP packets through the SCW occupied by the neighbor BSs during a second interval of the transmission interval Receiving a CBP packet of the neighbor BSs through at least one SCW among the SCWs occupied by the neighbor BSs during the second interval, and transmitting the CBP packet to the neighbor BSs during the second interval, And transmitting data through at least one SCW that does not transmit or receive data.

According to a second aspect of the present invention, there is provided a method for transmitting a coexistence beacon protocol packet in a wireless communication system, the method comprising the steps of: Determining SCWs occupied by the neighbor BSs using the CBP packets provided from the BSs; determining a SCW to transmit the CBP packets considering the SCWs occupied by the neighbor BSs; Receiving a CBP packet of the neighbor BSs through at least one SCW among the SCWs occupied by the neighbor BSs during the second interval; Data is transmitted through at least one SCW that does not transmit / receive a CBP packet with the neighbor base stations In that it comprises a static features.

According to a third aspect of the present invention, there is provided an apparatus for transmitting a coexistence beacon protocol packet in a wireless communication system, the apparatus comprising: self-coexistence areas allocated in a first period of a transmission period for transmitting CBP packet transmission information; A receiving unit for receiving a CBP packet through at least one SCW among the SCWs occupied by the neighbor BSs; and a SCW for checking the SCWs occupied by the neighboring BSs using the CBP packet received through the receiving unit during the first interval A control unit for controlling transmission and reception of CBP packets and transmission and reception of CBP packets and transmission of data during a second interval according to the SCW information occupied by the neighbor base stations; A CBP packet is transmitted through the SCW occupied by the neighbor BSs during the second interval, Also it characterized in that comprises a transmitter for transmitting data through one of SCW.

According to a fourth aspect of the present invention, an apparatus for transmitting a coexistence beacon protocol packet in a wireless communication system includes self-coexistence areas allocated in a first period of a transmission period for transmitting CBP packet transmission information, A receiving unit for receiving a CBP packet through at least one SCW among the SCWs occupied by the neighbor BSs; and a SCW for checking the SCWs occupied by the neighboring BSs using the CBP packet received through the receiving unit during the first interval An SCW determining unit for determining an SCW to transmit a CBP packet according to the SCW information occupied by the neighbor base stations; a transmission / reception unit for transmitting / receiving a CBP packet during the first interval and a second interval A controller for controlling the transmission and reception of CBP packets and the transmission of data during the first and second intervals, Transfer the kit, and the second is characterized in that comprises a transmitter for transmitting data on at least one SCW does not transmit and receive the neighbor base stations and CBP packet for two intervals.

As described above, in a wireless communication system using a wireless cognitive function, neighbor base stations share self-coexistence region information for transmitting their coexistence beacon protocol packets during a known interval, thereby advantageously transmitting coexistence beacon protocol packets without errors .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a technique for exchanging Coexistence Beacon Protocol (CBP) packets between base stations using a cognitive radio function in a wireless communication system will be described. That is, a technique for reducing interference of CBP packets between base stations using the same frequency band in the wireless communication system will be described.

The wireless communication system allocates a self-coexistence window (hereinafter referred to as SCW) slot for transmitting CBP packets to each frame. However, if it is determined that there is no need to exchange information with neighbor base stations through the CBP packet, the base station may transmit data through the SCW slot as shown in FIG.

1 illustrates an SCW slot for transmitting a CBP packet in a wireless communication system according to an embodiment of the present invention.

As shown in FIG. 1, the wireless communication system controls the base stations 100 and 110 using the same frequency band to transmit CBP packets through different SCW slots to reduce collision of CBP packets. For example, the first base station 100 transmits the CBP packet through the SCW slot allocated to the first frame. In addition, the second base station 110 transmits the CBP packet through the SCW slot allocated to the second frame. At this time, the first base station 100 and the second base station 110 transmit the CBP packet once in the SCW activation period 140.

If it is determined that the first base station 100 and the second base station 110 do not need to exchange information with the neighbor base station through the CBP packet, the first base station 100 and the second base station 110 transmit data through the SCW slot.

If the third BS 120 using the same frequency band as that of the BSs 100 and 110 is added, the BS 120 monitors the channels of the BSs 100 and 110, (SCW) slot not occupied by the MSs 100 and 110 (150). Then, the third BS 120 determines one of the SCW slots not occupied by the BSs 100 and 110 as an SCW slot for transmitting its CBP packet. At this time, the third BS 120 transmits the CBP packet once every SCW active period 140 using the determined SCW slot.

As described above, when data is transmitted through the SCW slot determined to be unnecessary to exchange information with the neighbor base stations through the CBP packet, data transmitted from the neighbor base station may interfere with the CBP packet.

Therefore, in the wireless communication system, base stations using the same frequency band share SCW slot information occupied by themselves in order to reduce interference of CBP packets. Accordingly, as shown in FIG. 2, the wireless communication system sets a part of the CBP packet transmission interval as a notification period (Announcement Period) in which base stations using the same frequency band share the SCW slot information occupied by the base stations.

2 illustrates a configuration for sharing occupied SCW slot information in a wireless communication system according to an embodiment of the present invention.

As shown in FIG. 2, the wireless communication system divides a transmission interval into a notification interval 231 and a normal operation interval 233. Here, the known interval may be set to the same length as the SCW activation period 235.

During the announcement period 231, the base stations transmit and receive only the CBP packet through the SCW interval allocated to each frame in order to identify the SCW slot occupied by the neighbor BSs through the CBP packet received from the neighbor BSs. For example, the first base station 200 transmits the CBP packet through the SCW slot of the first frame during the announcement period 231, and checks whether CBP packets of neighboring base stations are received through the SCW slot of the remaining frame. At this time, the second BS 210 may recognize that the first BS 200 occupies the SCW slot of the first frame through the CBP packet received through the SCW slot of the first frame. In addition, the second base station 210 transmits the CBP packet through the SCW slot of the second frame during the announcement period 231, and checks whether CBP packets of neighboring base stations are received through the SCW slot of the remaining frame. At this time, the first base station 200 can recognize that the second base station 210 occupies the SCW slot of the second frame through the CBP packet received through the SCW slot of the second frame.

The CBP packet transmitted from the first base station 200 and the second base station 210 during the announcement interval 231 includes an SCW map 240 including usage information of SCW slots allocated to the announcement interval 231 . For example, the SCW map 240 indicates that the SCW slots allocated to the first frame and the second frame of the known interval 231 are occupied by the first and second base stations 200 and 210.

As described above, the BSs 200 and 210 share the SCW slot information occupied by the BSs 200 during the announcement period 231. Accordingly, the newly added base station determines the SCW slot occupied by the BSs 200 and 210 in consideration of the SCW slot information occupied by the BSs 200 and 210 during the known interval. For example, when the base station 3 220 is added, the base station 220 transmits the CBP packet received during the announcement period 231 to the SCW You can see the slot. The BS 220 may transmit the CBP packet 240 to the BS 200 and the BS 210 through the SCW map 240 of the CBP packet received from the BS 200 or the BS 210, The SCW slot occupied by the SCW can be checked.

In addition, the third BS 220 determines one of the SCW slots not occupied by the BSs 200 and 210 as a SCW slot for transmitting the CBP packet. Then, the BS 3 220 informs the BS 1 200 and the BS 2 210 of the SCW slot information occupied by the BS 220. For example, the BS 3 220 transmits a CBP packet through the SCW slot occupied by the BS 230 during the announcement period 231. At this time, the first and second base stations 200 and 210 recognize the SCW slot in which the CBP packet transmitted by the third BS 220 is received as the SCW slot occupied by the third BS 220. In another embodiment, the Node B 3 220 adds the SCW map 250 including the SCW slot information occupied by itself to the CBP packet and transmits the same. The SCW map 250 includes SCW slot information occupied by the first and second base stations 200 and 210 as well as the SCW slot information occupied by the third BS 220. For example, the SCW map 250 indicates that the SCW slots allocated to the first frame, the second frame, and the third frame of the known interval 231 are transmitted to the BS 1 200, the BS 2 210, (220). ≪ / RTI >

During the active period 233, the BSs 200, 210 and 220 transmit and receive CBP packets for the occupied SCW slots and data for the unoccupied SCW slots. For example, the first base station 200 transmits a CBP packet through the SCW slot of the first frame during the active period 233 and transmits the CBP packet through the SCW slot of the second frame and the third frame to the neighbor BSs 210 and 220 And receives the CBP packet. Also, the BS 210 transmits a CBP packet through the SCW slot of the second frame during the active period 233 and transmits the CBP packet through the SCW slot of the first frame and the third frame to the neighbor BSs 200 and 220 Receives a CBP packet. In addition, the BS 220 transmits a CBP packet through the SCW slot of the third frame during the operation interval 233 and transmits the CBP packet through the SCW slot of the first frame and the second frame to the neighbor BSs 200 and 210 Receives a CBP packet. In addition, the BSs 200, 210, and 220 transmit data through the SCW slots that are not occupied in the active period 233. At this time, if the CBP packet is not received through the SCW slot occupied by another base station, the corresponding base station may transmit data through the SCW slot occupied by the other base station.

As described above, in the wireless communication system, base stations using the same frequency band divide a transmission interval into an announcement interval and an operation interval to share the SCW slot information occupied by the base stations in order to reduce interference of CBP packets. At this time, as the SCW occupation pattern of the base station changes over time, the wireless communication system configures a transmission interval so as to have a notification interval periodically.

Hereinafter, an operation method of a base station for sharing SCW slot information occupied by the wireless communication system will be described.

3 illustrates a procedure for sharing occupancy information for neighboring BSs with SCW slots in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 3, in step 301, the BS checks a transmission interval of the CBP packet. For example, the BS determines whether the transmission interval is a known interval or an active interval.

If the transmission interval is not a known interval, the BS proceeds to step 311 and checks whether the transmission interval is an operation interval.

On the other hand, if the transmission interval is the announcement interval, the BS proceeds to step 303 and checks whether the SCW slot occupied by the BS arrives. At this time, since the BS determines the SCW slot in which the BS has transmitted the CBP packet through the SCW slot information occupied by the neighbor BSs during the previous announcement period, it can identify the SCW slot occupied by the neighbor BSs

If the occupied SCW slot arrives, the BS proceeds to step 305 and transmits a CBP packet through the SCW slot. At this time, the BS constitutes a CBP packet including SCW slot information occupied by itself and SCW slot information occupied by neighbor BSs among SCW slots allocated to the known period.

On the other hand, if the SCW slot of the current frame is not the SCW slot occupied by the current SCW slot, the BS proceeds to step 307 to switch to the CBP packet reception mode and receive the CBP packet transmitted by the neighbor BSs.

If the CBP packet transmitted by the neighbor BSs is received through the SCW slot, the BS proceeds to step 309 and checks the SCW slot occupied by the neighbor BSs through the CBP packet. For example, when the CBP packet is received, the BS recognizes that the SCW slot received by the CBP packet is occupied by the neighbor BS. In another embodiment, the BS may check the SCW slot occupied by the neighbor BSs through the SCW map included in the CBP packet received from the neighbor BS.

Thereafter, the BS proceeds to step 311 and checks the transmission interval of the CBP packet. For example, the BS determines whether the transmission interval is a known interval or an active interval.

If the transmission interval is not an operation interval, the BS proceeds to step 301 and checks whether the transmission interval is a notification interval.

On the other hand, if the transmission interval is the operation interval, the BS proceeds to step 313 and checks whether the SCW slot occupied by the BS is present.

If the occupied SCW slot arrives, the BS proceeds to step 315 and transmits a CBP packet through the SCW slot.

On the other hand, if the SCW slot of the current frame is not the SCW slot occupied by the current SCW slot, the BS proceeds to step 317 and checks whether the CBP packet of the neighbor BSs should be received through the SCW slot. That is, the BS determines whether the SCW slot is an SCW slot occupied by neighbor BSs.

If the neighboring BSs occupy the SCW slot, the BS proceeds to step 319 to switch to the CBP packet reception mode and receive the CBP packet transmitted by the neighbor BSs through the SCW slot.

On the other hand, if neighboring BSs do not occupy the SCW slot, the BS proceeds to step 321 and transmits data through the SCW slot.

Thereafter, the base station terminates the present algorithm.

Hereinafter, an operation method of a base station for determining its own SCW slot according to SCW slot information occupied by neighbor base stations in the wireless communication system will be described.

FIG. 4 illustrates a procedure for determining a SCW slot according to an SCW slot occupied by neighbor BSs in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 4, in step 401, the BS checks a transmission interval of a CBP packet. For example, the BS determines whether the transmission interval is an announcement interval or an operation interval.

If the transmission interval is the announcement period, the BS proceeds to step 403 and checks the SCW slot occupied by the neighbor BSs through the CBP packet received from the neighbor BSs. For example, when the CBP packet is received, the BS recognizes that the SCW slot received by the CBP packet is occupied by the neighbor BS. In another embodiment, the BS may check the SCW slot occupied by the neighbor BSs through the SCW map included in the CBP packet received from the neighbor BS.

After confirming the SCW slot occupied by the neighbor BSs, the BS proceeds to step 405 and determines that one of the SCW slots not occupied by the neighbor BSs is a SCW slot for transmitting the CBP packet.

After determining the SCW slot occupied by itself, the BS proceeds to step 407 and informs the neighbor BSs of the SCW slot information occupied by the SCW slot. For example, the BS transmits a CBP packet through an SCW slot that it has decided to occupy. At this time, the neighbor BSs can identify the SCW slot occupied by the BS, which has received the CBP packet transmitted from the BS. In another embodiment, the base station adds a SCW map including the SCW slot information occupied by the base station to the CBP packet, and transmits the SCW map.

Thereafter, the BS proceeds to step 409 and checks the transmission interval of the CBP packet. For example, the BS determines whether the transmission interval is a known interval or an active interval.

If the transmission interval is not an operation interval, the BS proceeds to step 401 to check whether the transmission interval is a notification interval.

On the other hand, if the transmission interval is an operation interval, the BS proceeds to step 411 and determines whether the SCW slot occupied by the BS is present.

If the occupied SCW slot arrives, the BS proceeds to step 413 and transmits a CBP packet through the SCW slot.

On the other hand, if the SCW slot of the current frame is not the SCW slot occupied by the current SCW slot, the BS proceeds to step 415 and checks whether the CBP packet of the neighbor BSs should be received through the SCW slot. That is, the BS determines whether the SCW slot is an SCW slot occupied by neighbor BSs.

If the neighbor BSs occupy the SCW slot, the BS proceeds to step 417 to switch to the CBP packet reception mode and receive the CBP packet transmitted by the neighbor BSs through the SCW slot.

On the other hand, if neighbor BSs do not occupy the SCW slot, the BS proceeds to step 419 and transmits data through the SCW slot.

Thereafter, the base station terminates the present algorithm.

Hereinafter, a configuration of a base station for sharing SCW slot information occupied by the wireless communication system will be described.

5 illustrates a block diagram of a BS for sharing occupancy information with neighbor BSs in an SCW slot in a wireless communication system according to the present invention.

5, the base station includes a duplexer 500, a receiver 510, a controller 520, an SCW slot identifying unit 521, a transmitter 530, and a frequency controller 540.

The duplexer 500 transmits a transmission signal provided from the transmitter 530 through the antenna according to a duplexing scheme and provides a reception signal from the antenna to the receiver 510. [

The receiver 510 includes an RF (Radio Frequency) processor 511, an analog / digital converter (ADC) 513, an Orthogonal Frequency Division Multiplexing (OFDM) demodulator 515, a decoder 517, And a message processor 519.

The RF processor 511 converts a radio frequency signal received through the set operation channel into a baseband analog signal under the control of the frequency controller 540. The analog-to-digital converter 513 converts the analog signal supplied from the RF processor 511 into digital sample data and outputs the digital sample data. The OFDM demodulator 515 converts the time-domain sample data provided from the A / D converter 513 to a frequency domain data through a Fourier transform. Here, the OFDM demodulator 515 performs Fourier transform using an FFT (Fast Fourier Transform) operator.

The decoder 517 selects data of subcarriers to be actually received from the frequency-domain data provided from the OFDM demodulator 515. Thereafter, the decoder 517 demodulates and decodes the selected data according to a predetermined modulation level (Modulation and Coding Scheme) level and outputs the demodulated and decoded data.

The message processor 519 disassembles the control message provided from the decoder 517 and provides the result to the controller 520. For example, the message processor 519 provides the control unit 520 with the CBP packet provided from the neighbor base stations.

The controller 520 controls the overall operation so that the wireless cognitive function can be performed. In addition, the controller 520 controls to share the SCW slot information occupied by the neighbor base stations using the same frequency band to reduce interference with CBP packets. Accordingly, in order to check the SCW slot occupied by the neighbor BSs through the CBP packet received from the neighbor BSs, the controller 520 transmits the CBP packet through the SCW interval allocated to each frame of the known interval, And a transmitter 530. [0050]

In addition, the control unit 520 can check the SCW slot occupied by the neighbor BSs according to the SCW slot information provided from the SCW slot identifying unit 521. Accordingly, the controller 520 controls the receiver 510 to receive the CBP packet through the SCW packet occupied by the neighbor BSs during the operation interval.

In addition, the controller 520 controls the data to be transmitted through the SCW slot that is not occupied by the neighbor BSs but occupied by the neighbor BSs during the operation period.

Also, the controller 520 controls the frequency controller 540 to switch the operation channel according to the wireless recognition function.

The SCW slot identifying unit 521 identifies the SCW slot occupied by the neighbor BSs through the CBP packet of the neighbor BSs provided from the message processor 519 during the known interval. For example, when the CBP packet of the neighbor BSs is received from the message processor 519, the SCW slot identifying unit 521 recognizes that the SCW slot received by the CBP packet is occupied by the neighbor BSs. For example, the SCW slot identifying unit 521 may check the SCW slot occupied by the neighbor BSs through the SCW map included in the CBP packet received from the neighbor BSs.

The frequency controller 540 controls a channel for transmitting a signal in the transmitter 530 and a channel for receiving a signal in the receiver 510 under the control of the controller 520.

The transmitter 530 includes a message generator 531, an encoder 533, an OFDM modulator 535, a digital / analog converter (DAC) 537, and an RF processor 539.

The message generator 531 generates a CBP packet transmitted from the spectrum controller to the neighbor BSs through the SCW slot occupied by the message generator 531 during the announcement interval and the operation interval according to the control of the controller 520. [ When generating the CBP packet transmitted during the announcement period, the message generator 531 generates the SCW slot information occupied by the SCW slots allocated to the known interval and the SCW slot information occupied by the neighbor BSs, And generates a CBP packet to include the map.

The encoder 533 codes and modulates the message and the transmission data provided from the message generator 531 according to the modulation level (MCS level). The OFDM modulator 535 converts the frequency domain data provided from the encoder 533 into an OFDM symbol in a time domain through an inverse Fourier transform. Here, the OFDM modulator 535 performs inverse Fourier transform using an IFFT (Inverse Fast Fourier Transform) operator.

The digital-to-analog converter 537 converts the sample data supplied from the OFDM modulator 535 into an analog signal and outputs the analog signal. The RF processor 539 converts the analog signal received from the digital-to-analog converter 537 into a high frequency signal of the corresponding channel under the control of the frequency controller 550 and outputs the converted high frequency signal.

The following description explains a configuration of a base station for determining its SCW slot according to SCW slot information occupied by neighbor BSs in the wireless communication system.

6 shows a block configuration of a base station for determining its own SCW slot according to a SCW slot occupied by neighbor base stations in the wireless communication system according to the present invention.

6, the base station includes a duplexer 600, a receiver 610, a controller 620, an SCW slot identifying unit 621, an SCW slot determining unit 623, a transmitter 630, and a frequency controller 640).

The duplexer 600 transmits the transmission signal provided from the transmitter 630 through the antenna according to the duplexing scheme and provides the reception signal from the antenna to the receiver 610.

The receiver 610 includes an RF processor 611, an A / D converter 613, an OFDM demodulator 615, a decoder 617, and a message processor 619.

The RF processor 611 converts the high frequency signal received through the set operation channel into a baseband analog signal under the control of the frequency controller 640. The analog-to-digital converter 613 converts the analog signal supplied from the RF processor 611 into digital sample data and outputs the digital sample data. The OFDM demodulator 615 converts the time-domain sample data provided from the A / D converter 613 into frequency-domain data through the Fourier transform. Here, the OFDM demodulator 615 performs Fourier transform using an FFT operator.

The decoder 617 selects data of subcarriers to be actually received from the frequency-domain data provided from the OFDM demodulator 615. Thereafter, the decoder 617 demodulates and decodes the selected data according to a predetermined modulation level (MCS level) and outputs the demodulated data.

The message processor 619 disassembles the control message provided from the decoder 617 and provides the control message to the controller 620. For example, the message processor 619 provides the CBP packet provided from the neighbor BSs to the controller 620.

The controller 620 controls the overall operation so that the wireless cognitive function can be performed.

The controller 620 determines an SCW slot for transmitting the CBP packet to the neighboring stations using the same frequency band using the SCW slot identifying unit 621 and the SCW slot determining unit 623. [ Then, the control unit 620 controls to share the SCW slot information occupied by the neighbor BSs in order to reduce interference with the neighbor BSs.

In addition, the controller 620 may check the SCW slot occupied by the neighbor BSs according to the SCW slot information provided from the SCW slot identifier 621. [ Therefore, the controller 620 controls the receiver 610 to receive the CBP packet through the SCW packet occupied by the neighbor BSs during the operation interval.

In addition, the controller 620 controls the data to be transmitted through the SCW slot that is not occupied by the neighbor BSs but occupied by the neighbor BSs during the operation period.

Also, the controller 620 controls the frequency controller 640 to switch the operation channel according to the wireless cognitive function.

The SCW slot identifying unit 621 identifies the SCW slot occupied by the neighbor BSs through the CBP packet of the neighbor BSs provided from the message processor 619 during a known interval. For example, when the CBP packet of the neighbor BSs is received from the message processor 619, the SCW slot identifying unit 621 recognizes that the SCW slot received by the CBP packet is occupied by the neighbor BSs. In another embodiment, the SCW slot identifying unit 621 may check the SCW slot occupied by the neighbor BSs through the SCW map included in the CBP packet received from the neighbor BSs.

The SCW slot determining unit 623 determines whether or not to transmit its CBP packet among the SCW slots not occupied by the neighbor BSs according to the SCW slot information occupied by the neighboring base stations provided from the SCW slot identifying unit 621 Select the SCW slot.

The frequency controller 640 controls a channel for transmitting a signal in the transmitter 630 and a channel for receiving a signal in the receiver 610 under the control of the controller 620.

The transmitter 630 includes a message generator 631, an encoder 633, an OFDM modulator 635, a digital-to-analog converter 637, and an RF processor 639.

Under the control of the controller 620, the message generator 631 generates a CBP packet transmitted from the spectrum controller to the neighbor BSs through the SCW slot occupied by the message generator 631 during the announcement interval and the operation interval. When generating the CBP packet transmitted during the announcement period, the message generator 631 generates SCW slot information occupied by itself and SCW slot information occupied by neighbor BSs among the SCW slots allocated to the known interval, And generates a CBP packet to include the map.

The encoder 633 codes and modulates the message and transmission data provided from the message generator 631 according to the modulation level (MCS level). The OFDM modulator 635 converts the frequency domain data provided from the encoder 633 into in-time sample data (OFDM symbol) through inverse Fourier transform and outputs the transformed data. Here, the OFDM modulator 635 performs an inverse Fourier transform using an IFFT operator.

The digital-to-analog converter 637 converts the sample data supplied from the OFDM modulator 635 into an analog signal and outputs the analog signal. The RF processor 639 converts the analog signal supplied from the digital-to-analog converter 637 into a high frequency signal of the corresponding channel under the control of the frequency controller 660 and outputs the converted high frequency signal.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 is a diagram illustrating a SCW slot for transmitting a CBP packet in a wireless communication system according to an embodiment of the present invention;

2 illustrates a configuration for sharing occupied SCW slot information in a wireless communication system according to an embodiment of the present invention;

3 is a diagram illustrating a procedure for sharing SCW slot information with neighbor BSs in a wireless communication system according to an embodiment of the present invention;

4 is a diagram illustrating a procedure for determining an SCW slot according to SCW slot information occupied by neighbor BSs in a wireless communication system according to an embodiment of the present invention;

5 is a block diagram of a BS for sharing SCW slot information with neighbor BSs in a wireless communication system according to the present invention, and FIG.

6 is a block diagram of a base station for determining its own SCW slot according to SCW slot information occupied by neighbor BSs in a wireless communication system according to the present invention.

Claims (22)

A method for transmitting a coexistence beacon protocol (CBP) packet in a wireless communication system, The at least one neighboring base station occupies at least one neighboring base station using a CBP packet provided from at least one neighboring base station through Self Coexistence Window (SCW) allocated in a first period of a transmission period for transmitting CBP packet transmission information The process of identifying one SCW, Transmitting a CBP packet through a SCW occupied by the UE during a second period of the transmission period; Receiving CBP packets of the at least one neighbor BS through at least one SCW among SCWs occupied by the at least one neighbor BS during the second interval; And transmitting data through at least one SCW that does not transmit / receive a CBP packet to / from the at least one neighbor base station during the second interval. The method according to claim 1, Wherein the step of checking the SCWs occupied by the at least one neighbor base station comprises: And confirming that the at least one neighbor BS occupies the SCWs from which the CBP packet is received from the at least one neighbor BS. The method according to claim 1, Wherein the step of checking the SCWs occupied by the at least one neighbor base station comprises: And checking the SCW information occupied by the at least one neighbor base station through the SCW map information included in the CBP packet provided from the at least one neighbor base station. The method according to claim 1, Further comprising the step of transmitting a CBP packet through the SCW occupied by the UE during the first period. 5. The method of claim 4, Wherein the CBP packet includes SCW information for transmitting and receiving a CBP packet among the SCWs allocated in the first period. 6. The method of claim 5, Wherein the CBP packet includes SCW information for transmitting and receiving the CBP packet in the form of a bitmap. A method for transmitting a coexistence beacon protocol (CBP) packet in a wireless communication system, The at least one neighboring base station occupies at least one neighboring base station using a CBP packet provided from at least one neighboring base station through Self Coexistence Window (SCW) allocated in a first period of a transmission period for transmitting CBP packet transmission information The process of identifying one SCW, Determining a SCW to transmit a CBP packet considering the SCWs occupied by the at least one neighbor base station; Transmitting a CBP packet through the determined SCW during a second period of the transmission period; Receiving CBP packets of the at least one neighbor BS through at least one SCW among SCWs occupied by the at least one neighbor BS during the second interval; And transmitting data through at least one SCW that does not transmit / receive a CBP packet to / from the at least one neighbor base station during the second interval. 8. The method of claim 7, Wherein the step of checking the SCWs occupied by the at least one neighbor base station comprises: And confirming that the at least one neighbor BS occupies the SCWs from which the CBP packet is received from the at least one neighbor BS. 8. The method of claim 7, Wherein the step of checking the SCWs occupied by the at least one neighbor base station comprises: And checking the SCW information occupied by the at least one neighbor base station through the SCW map information included in the CBP packet provided from the at least one neighbor base station. 8. The method of claim 7, And transmitting the CBP packet through the determined SCW during the first interval. 11. The method of claim 10, Wherein the CBP packet includes SCW information for transmitting and receiving a CBP packet among the SCWs allocated in the first period. 12. The method of claim 11, Wherein the CBP packet includes SCW information for transmitting and receiving the CBP packet in the form of a bitmap. An apparatus for transmitting a coexistence beacon protocol (CBP) packet in a wireless communication system, (SCW) allocated to a first period of a transmission period for transmitting CBP packet transmission information and at least one SCW among SCWs occupied by at least one neighbor base station during a second interval A receiving unit for receiving a CBP packet, An SCW checking unit for checking the SCWs occupied by the at least one neighboring BS using the CBP packet provided through the receiver during the first interval; A controller for controlling transmission / reception of CBP packets and transmission / reception of CBP packets and transmission of data during a second interval according to the SCW information occupied by the at least one neighbor BS; Transmits the CBP packet through the SCW occupied by the BS during the first interval and the second interval and transmits data through at least one SCW that does not transmit and receive the CBP packet to the at least one neighbor BS during the second interval And a transmitting unit. 14. The method of claim 13, Wherein the SCW checking unit determines that the at least one neighbor BS occupies the SCWs from which the CBP packet is received from the at least one neighbor BS during the first interval. 14. The method of claim 13, Wherein the SCW checking unit checks the SCW information occupied by the at least one neighbor base station through the SCW map information included in the CBP packet provided from the at least one neighbor base station during the first interval. 14. The method of claim 13, Wherein the transmission unit constructs a CBP packet including SCW information for transmitting and receiving a CBP packet among the SCWs allocated to the first period, and transmits the CBP packet during the first interval. 17. The method of claim 16, Wherein the transmitting unit forms a CBP packet including SCW information for transmitting and receiving the CBP packet in the form of a bitmap. An apparatus for transmitting a coexistence beacon protocol (CBP) packet in a wireless communication system, (SCW) allocated to a first period of a transmission period for transmitting CBP packet transmission information and at least one SCW among SCWs occupied by at least one neighbor base station during a second interval A receiving unit for receiving a CBP packet, An SCW checking unit for checking SCWs occupied by at least one neighboring BS using the CBP packet provided through the receiver during the first interval; An SCW determination unit for determining an SCW to transmit a CBP packet according to SCW information occupied by at least one neighbor base station, A controller for controlling transmission / reception of CBP packets and transmission / reception of CBP packets and transmission of data during a second interval according to SCW information occupied by at least one neighbor BS; A transmitter for transmitting a CBP packet through the SCW occupied by the BS during the first interval and the second interval and transmitting data through at least one SCW that does not transmit and receive CBP packets for the second interval during the second interval; ≪ / RTI > 19. The method of claim 18, Wherein the SCW checking unit determines that the at least one neighbor BS occupies the SCWs from which the CBP packet is received from the at least one neighbor BS during the first interval. 19. The method of claim 18, Wherein the SCW checking unit checks the SCW information occupied by the at least one neighbor base station through the SCW map information included in the CBP packet provided from the at least one neighbor base station during the first interval. 19. The method of claim 18, Wherein the transmission unit constructs a CBP packet including SCW information for transmitting and receiving a CBP packet among the SCWs allocated to the first period, and transmits the CBP packet during the first interval. 22. The method of claim 21, Wherein the transmitting unit forms a CBP packet including SCW information for transmitting and receiving the CBP packet in the form of a bitmap.

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