KR20110092708A - Apparatus and method for reducing signal interference in a wireless communication system with hierarchycal cell structure - Google Patents

Abstract

PURPOSE: An apparatus and method for reducing signal interference in a wireless communication system are provided to remove signal interference due to a macro terminal which is adjacent to a small cell. CONSTITUTION: A receiver receives uplink signal of a macro terminal by scheduling information of the macro terminal. A transmitter(616) transmit the uplink signal to the macro base station by the scheduling information of the small base station. A controller(610) controls the transmitter in order to transmit the received signal to the macro base station by the existence of a macro terminal, the scheduling information of the macro terminal, and the scheduling information of the small base station.

Description

Apparatus and method for eliminating signal interference in a hierarchical cell communication system {APPARATUS AND METHOD FOR REDUCING SIGNAL INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM WITH HIERARCHYCAL CELL STRUCTURE}

The present invention relates to an apparatus and method for removing signal interference in a wireless communication system, and more particularly, to a signal interference by a macro terminal adjacent to a small cell in a hierarchical cell structure in which a macro cell and a small cell are mixed. It relates to an apparatus and a method for removing the.

In a wireless communication system, the communication between the terminal and the base station may be smooth due to a geographical requirement causing signal attenuation / dispersion in a cell, a distance between the terminal and the base station, and a channel change due to the movement of the terminal. For example, a radio wave shadow area may be formed inside a closed building in the service area of the macro base station. If the terminal is located in the radio shadow region, the base station and the terminal may not perform a smooth communication. For another example, when there are dense commercial districts or public facilities in the service area of the macro base station, the base station and the terminal may not be able to perform smooth communication due to insufficient service capacity.

The wireless communication system uses a small cell to solve the radio shadow area and the lack of service capacity of the macro cell. For example, a wireless communication system having a hierarchical cell structure in which small cells and macro cells are mixed may be configured as shown in FIG. 1. Here, the small cell represents a service area of a small base station installed indoors such as an office or a house and connected to a mobile communication core network through a broadband network. The small base station includes a micro base station, a self configurable base station, a compact base station, an indoor base station, a home base station, a femto base station, and the like.

1 illustrates a structure of a wireless communication system according to the prior art.

As shown in FIG. 1, the wireless communication system includes a macro cell 102 and small cells 110, 120, and 130. Here, the macro cell 102 represents the service area of the macro base station 100, and the small cells 110, 120, 130 represent the service area of each small base station.

When the macro cell and the small cell are mixed, the signal strengths of the macro cell and the small cell may be represented as shown in FIG. 2.

2 illustrates a signal strength graph in a wireless communication system having a conventional hierarchical cell structure. In the following description, the strength of a signal received by the terminal is represented by a signal-to-interference and noise ratio (CINR).

As shown in FIG. 2, the strengths of signals received from the macro base station 200 and the small base station 202 are different depending on the position of the terminal. That is, the closer the terminal is to the macro base station 200, the greater the signal-to-interference and noise ratio for the macro base station 200. In addition, the closer the terminal is to the small base station 202, the greater the signal-to-interference and noise ratio for the small base station 202. Accordingly, the terminal selects the serving base station using the signal-to-interference and noise ratio estimated through the received signal. For example, since the terminal 1 210 may receive only the signal of the macro base station 200, the terminal 1 210 selects the macro base station 200 as a serving base station. Terminal 2 (212) and terminal 3 (214) selects the small base station 210 as a serving base station because the signal-to-interference and noise ratio of the small base station 210 is larger than the signal-to-interference and noise ratio of the macro base station 200. . However, the terminal 3 214 may select the macro base station 200 as a serving base station. That is, when the terminal 3 214 is not authenticated by the small base station 210, the terminal 3 214 selects the macro base station 200 as a serving base station. In addition, when the moving speed of the terminal 3 (214) is fast, the terminal 3 (214) may maintain communication with the macro base station 200 to reduce the handover delay.

When the macro cell and the small cell are mixed, the small cell uses the same frequency band as the macro base station for efficient use of frequency resources. In this case, interference may occur at the boundary between the macro cell and the small cell. For example, when the terminal 3 214 of FIG. 2 selects the macro base station 200 as a serving base station, the terminal 3 214 is located at the edge of the macro cell and thus transmits a signal with a large transmission power. . Further, when the uplink subframe is configured in a frequency division multiplexing (FDM) scheme, the small base station 202 is a macro terminal as well as a signal of the terminal 2 212 providing a service, the terminal 3 214. Signal will be received at the same time. Accordingly, the small base station 202 may not perform a smooth communication with the terminal 2 (212) by the interference of the signal of the terminal 3 (214).

Accordingly, an object of the present invention is to provide an apparatus and method for canceling signal interference in a hierarchical cell structured wireless communication system.

Another object of the present invention is to provide an apparatus and method for removing signal interference by a macro terminal adjacent to a small cell in a hierarchical cell structure in which a macro cell and a small cell are mixed.

Another object of the present invention is to provide an apparatus and method for transmitting a UL signal to an adjacent small base station by a macro terminal in a hierarchical cell structure in which a macro cell and a small cell are mixed.

Another object of the present invention is to provide an apparatus and method for relaying an uplink signal of a macro terminal from a small base station to a macro base station in a hierarchical cell structure in which a macro cell and a small cell are mixed.

According to a first aspect of the present invention for achieving the objects of the present invention, a method for transmitting a signal in a small base station of a wireless communication system consisting of a hierarchical cell structure in which a macro cell and a small cell are mixed, the effect of interference When there is a macro terminal having a function, receiving the scheduling information of the macro terminal and the scheduling information of the small base station from the macro base station, and receiving the uplink signal of the macro terminal according to the scheduling information of the macro terminal And transmitting an uplink signal received from the macro terminal to the macro base station according to the scheduling information of the small base station, wherein the femto base station is located in a service area of the macro base station, and the macro terminal is located in the macro base station. Received service from base station It is characterized in that it represents.

According to a second aspect of the present invention, a method for transmitting a signal in a macro terminal provided with a service from a macro base station of a wireless communication system having a mixed hierarchical cell structure in which a macro cell and a small cell are mixed is provided to an adjacent small base station. If the interference is affected, receiving a downlink signal from the macro base station, checking uplink scheduling information in the signal received from the macro base station, and uplinking to the small base station according to the uplink scheduling information. And transmitting a link signal.

According to a third aspect of the present invention, an apparatus for transmitting a signal in a small base station of a wireless communication system having a hierarchical cell structure in which a macro cell and a small cell are mixed has a macro terminal influencing interference. A receiver receiving scheduling information of the macro terminal and scheduling information of the small base station from a macro base station, and receiving an uplink signal of the macro terminal according to scheduling information of the macro terminal, and according to scheduling information of the small base station; A transmitter for transmitting an uplink signal received from the macro terminal to the macro base station, and whether the macro terminal affects interference, and the scheduling information of the macro terminal and the scheduling information of the small base station are received from the macro terminal The signal received from the macro base And comprises a control unit for controlling to transmit, the femto base station is located within the service area of the macro base station, the macro terminal is characterized in that the receiving terminal is shown providing service from the macro base station.

According to a fourth aspect of the present invention, an apparatus for transmitting a signal in a macro terminal provided with a service from a macro base station of a wireless communication system composed of a hierarchical cell structure in which a macro cell and a small cell are mixed is provided to an adjacent small base station. In the case of the influence of interference, a receiver receiving a downlink signal from the macro base station, a controller for checking uplink scheduling information in the signal received from the macro base station, and uplinking to the small base station according to the uplink scheduling information. It characterized in that it comprises a transmitter for transmitting a link signal.

As described above, in a hierarchical cell communication system in which a macro cell and a small cell are mixed, a small base station relays an uplink signal of a macro terminal, which affects interference, to a macro base station, thereby reducing interference in the macro terminal. There is an advantage to this.

1 is a diagram showing the structure of a wireless communication system according to the prior art;
2 is a diagram illustrating a signal strength graph in a wireless communication system having a conventional hierarchical cell structure;
3 is a diagram showing a frame configuration of a wireless communication system according to the present invention;
4 is a diagram illustrating an operation procedure of a femto base station according to an embodiment of the present invention;
5 is a diagram illustrating an operation procedure of a macro terminal according to an embodiment of the present invention;
6 is a block diagram illustrating a femto base station according to the present invention; and
7 is a block diagram of a macro terminal according to the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The present invention provides a technique for eliminating interference of a macro terminal in a hierarchical cell structured wireless communication system in which a macro cell and a small cell are mixed. Here, the small cell refers to a service area of a small base station installed indoors such as an office or a house and connected to a mobile communication core network through a broadband network. The small base station includes a micro base station, a self configurable base station, a compact base station, an indoor base station, a home base station, a femto base station, and the like. The following description takes a femto base station among the small base stations as an example. In addition, the macro terminal represents a terminal receiving a service from the macro base station, the femto base station represents a terminal receiving a service from the femto base station.

The hierarchical cell communication system performs communication using a frame as shown in FIG. 3 to reduce interference of a macro terminal affecting interference to a femto base station. In the following description, a macro terminal affecting interference to the femto base station adjacent to the femto base station is referred to as a macro-femto terminal.

3 shows a frame structure of a wireless communication system according to the present invention.

As shown in FIG. 3, the frame 300 of the macro base station and the frame 330 of the femto base station include a downlink subframe 310 and an uplink subframe 320. In this case, the downlink subframe 310 and the uplink subframe 320 of the femto base station frame 330 are composed of first regions 312 and 322 and second regions 314 and 324.

The macro base station transmits a signal to the macro terminal during the downlink subframe 310. If there is a macro-femto terminal, the macro base station is an uplink map 340 of the macro-femto terminal and an uplink map 342 of the femto base station through the last section of the downlink subframe 310. ). Here, the uplink map 340 of the macro-femto terminal may include resource allocation information, transmission power, resource location, for transmitting the uplink signal to the femto base station through the macro-femto terminal 350 through the macro dedicated region 350. Includes at least one scheduling information of the resource permutation pattern. The uplink map 324 of the femto base station includes scheduling information for the femto base station to relay an uplink signal of the macro-femto terminal to the macro base station.

The macro base station receives a signal to the macro terminal during the uplink subframe 320. If the macro-femto terminal exists, the macro base station receives an uplink signal of the macro-femto terminal from the femto base station through the second region 324 of the uplink subframe 320.

The femto base station transmits a signal to the femto terminal during the first region 312 of the downlink subframe 310. If there is a macro-femto terminal, the femto base station receives the uplink map 342 of the femto base station from the macro base station during the second region 314 of the downlink subframe 310.

The femto base station receives a signal from a femto terminal during the first region 312 of the uplink subframe 320. If there is a macro-femto terminal, the femto base station sets some frequency resources of the first region 312 to the macro-dedicated region 350 for the macro-femto terminal. Accordingly, the femto base station receives a signal from the macro-femto terminal through the macro dedicated area 350. In addition, the femto base station transmits a signal provided from the macro-femto terminal to the macro base station during the second region 324 of the uplink subframe 320.

In the above-described embodiment, the downlink subframe 310 and the uplink subframe 320 of the femto base station frame 330 are composed of first regions 312 and 322 and second regions 314 and 324.

In another embodiment, when the macro-femto terminal does not exist, the downlink subframe 310 and the uplink subframe 320 of the femto base station frame 330 are the first region (312, 322) and the second region. (314, 324) may not be separated.

Hereinafter, a method of operating a femto base station for relaying a signal of a macro-femto terminal to a macro base station will be described.

4 illustrates an operation procedure of a femto base station according to an embodiment of the present invention.

Referring to FIG. 4, the femto base station determines whether there is a macro-femto terminal to relay an uplink signal in step 401. For example, the femto base station may determine whether there is a macro-femto terminal to relay an uplink signal from the macro base station through a backhaul network. For another example, the femto base station may determine whether there is a macro-femto terminal to relay an uplink signal from the macro base station through a separate control message.

If there is no macro-femto terminal for relaying the uplink signal, the femto base station proceeds to step 423 to release the protected resource interval for the macro-femto terminal. For example, the femto base station releases the macro dedicated area 350 shown in FIG. 3.

After releasing the protected resource interval, the femto base station proceeds to step 425 to transmit a signal to the femto terminal during the downlink subframe. For example, the femto base station transmits a signal to the femto terminal during the first region 312 of the downlink subframe 310 shown in FIG. For another example, the femto base station may transmit a signal to the femto terminal during the downlink subframe 310 shown in FIG.

In operation 427, the femto base station receives a signal from the femto terminal during the uplink subframe. For example, the femto base station receives a signal from the femto terminal during the first region 322 of the uplink subframe 320 shown in FIG. For another example, the femto base station may receive a signal from the femto terminal during the uplink subframe 320 shown in FIG.

If there is a macro-femto terminal to relay the uplink signal in step 401, the femto base station proceeds to step 403 to switch to the reception mode in the second region of the downlink subframe. For example, the femto base station transmits a signal to the femto terminal during the first region 312 of the downlink subframe 310 shown in FIG. Thereafter, the femto base station switches to a reception mode to receive a signal from the macro base station during the second region 314.

After switching to the reception mode, the femto base station proceeds to step 407 and receives an uplink map from the macro base station during the second region of the downlink subframe. Here, the uplink map includes an uplink map of a macro-femto terminal and an uplink map of a femto base station to relay an uplink signal.

After receiving the uplink map from the macro base station, the femto base station checks scheduling information of the macro-femto terminal to relay the uplink signal in the uplink map received from the macro base station in step 409. For example, the femto base station may include resource allocation information, transmission power, resource location, for transmitting the uplink signal to the femto base station through the macro-dedicated region by the macro-femto terminal in the uplink map of the macro-femto terminal; Confirm at least one information of the resource permutation pattern.

In operation 411, the femto base station confirms scheduling information for transmitting the signal of the macro-femto terminal to the macro base station. For example, the femto base station confirms scheduling information for the femto base station to relay the uplink signal of the macro-femto terminal to the macro base station in an uplink map of the femto base station.

In addition, the femto base station checks the transmission power for transmitting a signal of the macro-femto terminal to the macro base station in step 413. For example, the femto base station checks the macro base station and the predetermined transmission power. For another example, the femto base station may check the transmission power through the power control symbol provided from the macro base station. Here, the femto base station periodically controls the transmission power through the power control symbol.

In operation 415, the femto base station determines whether a signal is received from the macro-femto terminal based on the confirmed scheduling information of the macro-femto terminal. For example, the femto base station determines whether the signal of the macro-femto terminal is received through the macro dedicated region 350 included in the first region 322 of the uplink subframe 320 shown in FIG. 3. do.

When the signal is received from the macro-femto terminal, the femto base station proceeds to step 417 to restore the signal received from the macro-femto terminal. At this time, the femto base station restores the signal received from the macro-femto terminal to a symbol unit.

After restoring the signal of the macro-femto terminal, the femto base station proceeds to step 419 and switches to a transmission mode to transmit a signal to the macro base station through a second region of an uplink subframe. For example, the femto base station switches to a transmission mode to transmit a signal to the macro base station during the second region 324 of the uplink subframe 320 shown in FIG.

After switching to the transmission mode, the femto base station proceeds to step 421 and transmits the signal received from the macro-femto terminal to the macro base station based on the confirmed scheduling information of the femto base station. For example, the femto base station transmits a signal received from the macro-femto terminal to the macro base station during the second region 324 of the uplink subframe 320 shown in FIG. In this case, the femto base station transmits a signal received from the macro-femto terminal to the macro base station using the resource position and permutation pattern allocated from the macro base station.

Thereafter, the femto base station terminates the present algorithm.

As described above, the femto base station transmits a signal provided from the macro-femto terminal to the macro base station through the macro dedicated area. At this time, the femto base station transmits a signal in the same manner as the macro terminal provided with the service from the macro base station.

The following description describes a method for a macro terminal to transmit an uplink signal to a femto base station.

5 illustrates an operation procedure of a macro terminal according to an embodiment of the present invention.

Referring to FIG. 5, the macro terminal estimates a channel state with a macro base station serving as a serving base station in step 501.

After estimating the channel state with the macro base station, the macro terminal proceeds to step 503 and transmits the estimated channel state information to the macro base station through a control channel.

In step 505, the macro terminal determines whether it is a macro-femto terminal adjacent to the femto base station. For example, the macro terminal determines whether it is a macro-femto terminal through the control information provided from the macro base station. At this time, the macro base station may determine whether the macro-femto terminal based on the channel state information provided from the macro terminal. On the other hand, the macro base station may determine whether the macro-femto terminal based on the location information of the macro terminal.

If it is a macro-femto terminal, the macro terminal proceeds to step 507 and receives a downlink signal from the macro base station. For example, the macro terminal receives a downlink signal through the downlink subframe 310 illustrated in FIG. 3.

In step 509, the macro terminal checks uplink scheduling information through the uplink map provided from the macro base station. For example, the macro terminal checks scheduling information in an uplink map provided through the last section of the downlink subframe 310 illustrated in FIG. 3.

After checking the scheduling information for the uplink, the macro terminal proceeds to step 511 and transmits an uplink signal to the femto base station through the uplink guard resource band. For example, the macro terminal transmits an uplink signal to the femto base station through the macro dedicated region 350 included in the first region 322 of the uplink subframe 320 shown in FIG. 3.

If it is not the macro-femto terminal in step 505, the macro terminal proceeds to step 513 and receives a downlink signal from the macro base station. For example, the macro terminal receives a downlink signal through the downlink subframe 310 illustrated in FIG. 3.

In this case, the macro terminal proceeds to step 515 to check scheduling information on the uplink through the uplink map provided from the macro base station.

After checking the scheduling information for the uplink, the macro terminal proceeds to step 515 and transmits an uplink signal to the macro base station using the uplink scheduling information. For example, the macro terminal transmits an uplink signal to the macro base station through the uplink subframe 320 shown in FIG. 3.

Thereafter, the macro terminal terminates the present algorithm.

The following description describes the configuration of a femto base station for relaying a signal of a macro-femto terminal to a macro base station.

6 shows a block configuration of a femto base station according to the present invention.

As shown in FIG. 6, the femto base station includes a duplexer 600, a receiver 602, a message processor 604, a data recovery unit 606, a control unit 610, a message generator 612, and a data configuration unit ( 614 and transmitter 616.

The duplexer 600 transmits a transmission signal provided from the transmitter 616 through an antenna according to a duplexing scheme, and provides a reception signal from the antenna to the receiver 602.

The receiver 602 converts and demodulates a high frequency signal provided from the duplexer 600 to a baseband signal. For example, the receiver 602 receives a signal from a femto terminal during the uplink subframe 320 shown in FIG. 3 under the control of the controller 610. For another example, the receiver 602 receives a signal provided from a femto terminal during the first region 322 of the uplink subframe 320 shown in FIG. 3 under the control of the controller 610. It may be. For another example, the receiver 602 is a macro dedicated area 350 included in the first area 322 of the uplink subframe 320 shown in FIG. 3 under the control of the controller 610. While receiving a signal from the macro-femto terminal. For another example, the receiver 602 may receive an uplink map during the last period of the downlink subframe 310 shown in FIG. 3 under the control of the controller 610. Here, the uplink map includes an uplink map of the macro-femto terminal and an uplink map of the femto base station.

The receiver 602 may be configured to include an RF processing block, a demodulation block, a channel decoding block, and the like. Here, the RF processing block converts the high frequency signal provided from the duplexer 600 into a baseband signal under the control of the controller 610 and outputs the baseband signal. The demodulation block includes a fast fourier transform (FFT) operator for extracting data contained in each subcarrier from a signal provided from the RF processing block. The channel decoding block includes a demodulator, a deinterleaver, a channel decoder, and the like. .

The message processor 604 extracts control information from the signal provided from the receiver 602 and provides it to the controller 610. For example, the message processor 604 extracts the uplink map of the femto base station and the uplink map of the macro-femto terminal received from the macro base station during the last period of the downlink subframe 310 shown in FIG. 3. To the control unit 610.

The data recovery unit 606 restores data received from the receiver 602. For example, the data recovery unit 606 restores data received from the femto terminal during the uplink subframe 320 shown in FIG. 3. For another example, the data recovery unit 606 may restore data received from the femto terminal during the first region 322 of the uplink subframe 320 shown in FIG. 3. As another example, the data recovery unit 606 may be provided from the macro-femto terminal during the macro dedicated area 350 included in the first area 322 of the uplink subframe 320 shown in FIG. 3. You can also restore the received data. In this case, the data recovery unit 608 restores the data provided from the macro-femto terminal to symbol units.

The controller 610 controls the overall operation of the femto base station.

The controller 610 performs scheduling for femto terminals included in the service area.

When there is a macro-femto terminal to relay a signal to the macro base station, the controller 610 controls to receive scheduling information for relaying the signal of the macro-femto terminal from the macro base station. For example, the controller 610 controls to receive an uplink map during the second region 314 of the downlink subframe 310 illustrated in FIG. 3. In addition, the controller 610 controls to set a guard resource band for receiving a signal from the macro-femto terminal. For example, the controller 610 controls to set the macro dedicated area 350 in the first area 322 of the uplink subframe 320 shown in FIG. 3. In addition, the controller 610 controls to transmit a signal provided from the macro-femto terminal to the macro base station using a partial region of an uplink subframe. For example, the controller 610 controls to transmit the signal received from the macro-terminal to the macro base station through the second region 324 of the uplink subframe 320 shown in FIG. 3.

Although not shown, the controller 610 may be configured to include a power controller. In this case, the power control unit controls the transmission power for transmitting a signal of the macro-femto terminal from the femto base station to the macro base station. For example, the power control unit controls the transmission power based on the macro base station and the predetermined transmission power. For another example, the power control unit may periodically control the transmission power through a power control symbol provided from the macro base station.

The message generator 612 generates a control message to be transmitted to the femto terminal under the control of the controller 610.

The data configuration unit 614 configures data to be transmitted to the femto terminal or the macro base station. For example, the data configuration unit 614 configures data to be transmitted to the femto terminal during the downlink buffer frame 310 shown in FIG. 3 under the control of the controller 610. For another example, the data configuration unit 614 configures data to be transmitted to the femto terminal during the first area 312 of the downlink buffer frame 310 shown in FIG. 3 under the control of the controller 610. You may. For another example, the data constituent unit 614 may control the uplink bubbling frame 320 shown in FIG. 3 by using data provided from the macro-femto terminal under the control of the controller 610. Data to be transmitted to the macro base station during the two regions 324 may be configured. In this case, the data constructing unit 614 configures data to be transmitted to the macro base station according to the permutation pattern provided from the macro base station.

The transmitter 616 converts the control message provided from the message generator 612 and the data provided from the data configurator 614 into encoded and high frequency signals and transmits the converted and high frequency signals to the duplexer 600. For example, the transmitter 616 transmits a signal to the femto terminal during the downlink subframe 310 shown in FIG. 3 under the control of the controller 610. For another example, the transmitter 616 may transmit a signal to the femto terminal during the first area 312 of the downlink subframe 310 illustrated in FIG. 3 under the control of the controller 610. For another example, the transmitter 616 may transmit a signal to the macro base station during the second region 324 of the uplink subframe 320 shown in FIG. 3 under the control of the controller 610. .

The following description describes the configuration of a macro terminal for transmitting a signal to a macro base station or a femto base station.

7 shows a block configuration of a macro terminal according to the present invention.

As illustrated in FIG. 7, the macro terminal includes a duplexer 700, a receiver 702, a message processor 704, a controller 710, a message generator 712, and a transmitter 714.

The duplexer 700 transmits a transmission signal provided from the transmitter 714 through an antenna according to a duplexing scheme, and provides a reception signal from the antenna to the receiver 702.

The receiver 702 converts and demodulates a high frequency signal provided from the duplexer 700 to a baseband signal. For example, the receiver 702 receives a signal from the macro base station during the downlink subframe 310 shown in FIG. 3 under the control of the controller 710. For another example, the receiver 702 may receive a signal from the macro base station during the first region 312 of the downlink subframe 310 shown in FIG. 3 under the control of the controller 710. .

The receiver 702 may include an RF processing block, a demodulation block, a channel decoding block, and the like. Here, the RF processing block converts the high frequency signal provided from the duplexer 700 into a baseband signal under the control of the controller 710 and outputs the baseband signal. The demodulation block includes a fast fourier transform (FFT) operator for extracting data contained in each subcarrier from a signal provided from the RF processing block. The channel decoding block includes a demodulator, a deinterleaver, a channel decoder, and the like. .

The message processor 704 extracts the control information from the signal provided from the receiver 702 and provides it to the controller 710. For example, the message processor 704 extracts an uplink map of the macro-femto terminal received from the macro base station during the last section of the downlink subframe 310 shown in FIG. 3, and transmits the uplink map to the controller 710. to provide.

The controller 710 controls the overall operation of the macro terminal.

The controller 710 controls to receive a signal from the macro base station according to the scheduling information provided from the macro base station.

In addition, the controller 710 controls to transmit a signal to the macro base station or an adjacent femto base station according to the scheduling information provided from the macro base station. In this case, the controller 710 determines a base station to transmit an uplink signal according to the control information provided from the macro base station. For example, when the macro base station is designated as a macro terminal, the controller 710 recognizes that there is no femto base station to which the macro terminal affects interference. Accordingly, the controller 710 controls to transmit an uplink signal to the macro base station according to the scheduling information provided from the macro base station. For another example, when the macro base station is designated as a macro-femto terminal, the controller 710 recognizes that there is a femto base station in which the macro terminal affects interference. Accordingly, the controller 710 may control to transmit an uplink signal to the femto base station that affects the interference according to the scheduling information provided from the macro base station.

Although the controller 710 is not illustrated, the controller 710 may include a power controller. In this case, the power control unit controls the transmission power for transmitting a signal to the macro base station or the femto base station.

The message generator 712 generates a control message to be transmitted to the macro base station or the femto base station under the control of the controller 710.

The transmitter 714 converts the data to be transmitted to the macro base station or the femto base station and the control message provided from the message generator 712 into an encoding and high frequency signal and transmits the converted and high frequency signal to the duplexer 700. For example, the transmitter 714 transmits a signal to the macro base station during the uplink subframe 320 shown in FIG. 3 under the control of the controller 710. For another example, the transmitter 714 may control the macro dedicated area 350 included in the first area 322 of the uplink subframe 320 shown in FIG. 3 under the control of the controller 710. A signal may be transmitted to the femto base station through the terminal.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (24)

A method for transmitting a signal in a small base station of a wireless communication system having a hierarchical cell structure in which a macro cell and a small cell are mixed,
Receiving a scheduling information of the macro terminal and scheduling information of the small base station from the macro base station when the macro terminal affects interference;
Receiving an uplink signal of the macro terminal according to scheduling information of the macro terminal;
Transmitting an uplink signal received from the macro terminal to the macro base station according to the scheduling information of the small base station,
The femto base station is located in the service area of the macro base station,
The macro terminal indicates a terminal receiving a service from the macro base station.
The method of claim 1,
The small base station is any one of a micro base station, a self configurable base station, a compact base station, an indoor base station, a home base station, and a femto base station. How to.
The method of claim 1,
Receiving the scheduling information,
Transmitting a downlink signal to a femto terminal through a first region of a downlink subframe,
Receiving scheduling information of the macro terminal and scheduling information of the small base station from the macro base station through a second region of the downlink subframe,
The femto terminal is characterized in that the terminal receiving a service from the femto base station.
The method of claim 1,
Receiving an uplink signal of the macro terminal,
And receiving an uplink signal of the macro terminal through a guard resource band included in an uplink subframe according to the scheduling information of the macro terminal.
The method of claim 4, wherein
The guard resource band is set to a part of a resource of a first region of an uplink subframe.
The method of claim 1,
The process of transmitting to the macro base station,
Transmitting a signal received from the macro terminal to the macro terminal through a second region of an uplink subframe according to scheduling information of the femto base station;
And receiving a signal from a femto terminal or a macro terminal through a first region of the uplink subframe.
A method for transmitting a signal in a macro terminal provided with a service from a macro base station of a wireless communication system composed of a hierarchical cell structure in which a macro cell and a small cell are mixed,
Receiving a downlink signal from the macro base station when interference is affected by an adjacent small base station;
Checking uplink scheduling information in the signal received from the macro base station;
And transmitting an uplink signal to the small base station according to the uplink scheduling information.
The method of claim 7, wherein
The process of confirming the uplink scheduling information,
Receiving scheduling information for transmitting an uplink signal from the macro base station to the small base station through a second region of a downlink subframe.
The method of claim 7, wherein
The small base station is any one of a micro base station, a self configurable base station, a compact base station, an indoor base station, a home base station, and a femto base station. How to.
The method of claim 7, wherein
The process of transmitting the uplink signal,
And transmitting an uplink signal to the small base station through a guard resource band included in an uplink subframe according to the scheduling information.
The method of claim 10,
The guard resource band is set to a part of a resource of a first region of an uplink subframe.
The method of claim 7, wherein
Receiving a downlink signal from the macro base station if the adjacent small base station does not affect interference;
Checking uplink scheduling information in the signal received from the macro base station;
And transmitting an uplink signal to the macro base station according to the uplink scheduling information.
An apparatus for transmitting a signal in a small base station of a wireless communication system having a hierarchical cell structure in which a macro cell and a small cell are mixed,
When there is a macro terminal influencing interference, the scheduling information of the macro terminal and the scheduling information of the small base station are received from the macro base station, and the uplink signal of the macro terminal is received according to the scheduling information of the macro terminal. With receiver,
A transmitter for transmitting an uplink signal received from the macro terminal to the macro base station according to the scheduling information of the small base station;
It includes a control unit for controlling to transmit the signal received from the macro terminal to the macro base station according to the presence of the macro terminal affecting the interference, the scheduling information of the macro terminal and the scheduling information of the small base station,
The femto base station is located in the service area of the macro base station,
The macro terminal indicates a terminal receiving a service from the macro base station.
The method of claim 13,
The small base station is any one of a micro base station, a self configurable base station, a compact base station, an indoor base station, a home base station, and a femto base station. Device.
The method of claim 13,
The transmitter transmits a downlink signal to a femto terminal through a first region of a downlink subframe,
The receiver receives scheduling information of the macro terminal and scheduling information of the small base station from the macro base station through a second region of a downlink subframe,
The femto terminal is characterized in that the terminal receiving the service from the femto base station.
The method of claim 13,
And the receiver receives an uplink signal of the macro terminal through a guard resource band included in an uplink subframe according to scheduling information of the macro terminal.
17. The method of claim 16,
The guard resource band is set to a part of a resource of a first region of an uplink subframe.
The method of claim 13,
The receiver receives a signal from a femto terminal or a macro terminal through a first region of an uplink subframe,
The transmitter is characterized in that for transmitting the signal received from the macro terminal to the macro terminal through the second region of the uplink subframe according to the scheduling information of the femto base station.
An apparatus for transmitting a signal in a macro terminal provided with a service from a macro base station of a wireless communication system having a hierarchical cell structure in which a macro cell and a small cell are mixed,
A receiver receiving a downlink signal from the macro base station when interference is caused to an adjacent small base station;
A controller for checking uplink scheduling information in the signal received from the macro base station;
And a transmitter for transmitting an uplink signal to the small base station according to the uplink scheduling information.
The method of claim 19,
And the receiver receives scheduling information for transmitting an uplink signal from the macro base station to the small base station through a second region of a downlink subframe.
The method of claim 19,
The small base station is any one of a micro base station, a self configurable base station, a compact base station, an indoor base station, a home base station, and a femto base station. Device.
The method of claim 19,
And the transmitter transmits an uplink signal to the small base station through a guard resource band included in an uplink subframe according to the scheduling information.
The method of claim 22,
The guard resource band is set to a part of a resource of a first region of an uplink subframe.
The method of claim 19,
And the transmitter transmits an uplink signal to the macro base station according to the uplink scheduling information when the interference is not affected to an adjacent small base station.

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