KR20090092420A - Method of Resource Allocation in Mobile Communication System based on Cell - Google Patents

Abstract

A resource allocation method in a cell-based mobile communication system is provided to reduce the interference which may be generated from a cell boundary or sector boundary. The overall frequency band, which is allocated for the communication between a base station and a terminal inside a cell, is divided to a plurality of partial bands. One of the partial bands is allocated to the terminal. The cell is divided into a cell boundary which is interfered from an adjacent cell, plural sectors which are formed according as the inside of the cell is divided by plural section lines between the center of the cell and the cell boundary, and a sector boundary which are interfered by the plural sectors.

Description

Method of Resource Allocation in Mobile Communication System based on Cell}

The present invention relates to wireless communication, and more particularly, to a resource allocation method in a cell-based mobile communication system.

The wireless communication system has a cell structure for efficient system configuration. A cell is a subdivision of a large area into smaller areas in order to use frequency efficiently. Multiple access systems generally include multiple cells. In general, the base station is installed in the cell to relay the terminal.

The wireless communication system supports downlink and uplink for a plurality of terminals. Here, downlink means communication from the base station to the terminal, and uplink means communication from the terminal to the base station. A base station (eg Node-B) operates a cell, and a scheduler located at the base station determines which terminal for which data is to be transmitted in the cell. The terminal may be a mobile or fixed device that is walking or operated by a person in a vehicle.

When there are a plurality of terminals in a cell, the plurality of terminals may simultaneously receive downlink data or transmit uplink data. The problem that may arise at this time is interference. Interference mostly includes thermal noise, power transmitted from other cells, dedicated channel power transmitted within the cell, power for shared channels transmitted within the cell, and the like.

In the data transmission by the terminal in the same cell, intra-cell interference is prevented through multiplexing having orthogonality. However, data transmission by the terminal in different cells may not be orthogonal, and the terminal may experience inter-cell interference from other cells. Inter-cell interference using the same frequency is called inter-cell interference.

Orthogonal Frequency Division Multiplexing (OFDM) is one of a technique using a plurality of subcarriers. OFDM partitions the overall system bandwidth into a plurality of subcarriers with orthogonality and loads data on subcarriers for transmission. In a multi-cell environment, a system such as OFDM can effectively reduce interference within a cell because of orthogonality between subcarriers. However, an OFDM system also has a disadvantage in that the influence of intercell interference cannot be reduced. This is because adjacent cells may use the same subcarrier as a cause of interference to users.

In order to maximize the data rate, it is desirable to minimize the interference on the terminal. One technique for reducing inter-cell interference is to use different frequencies between cells. This is called a frequency reuse technique. For example, if the number of adjacent cells is 3, the frequency band is allocated by dividing the entire frequency band into three parts so as not to overlap each other, thereby preventing inter-cell interference. 3 is referred to as a frequency reuse factor (FRF). The closer the frequency reuse factor is to 1, the higher the system capacity can be achieved, while the interference caused by reusing the same frequency also increases.

Alternatively, a directional antenna may be arranged so that signals from one cell do not overlap with signals from other cells. Even if the inter-cell interference can be reduced by this method, the inter-sector interference that divides the cells can still be excluded.

Therefore, there is a need for a resource allocation method that can effectively reduce interference to improve communication quality.

An object of the present invention is to provide a resource allocation method in a cell-based mobile communication system.

According to an aspect of the present invention, there is provided a resource allocation method in a cell-based mobile communication system. The method includes dividing an entire frequency band allocated for communication between a base station and a terminal in a cell into a plurality of partial bands, and assigning one of the plurality of partial bands to the terminal. It includes. The cell includes a cell boundary affected by interference from adjacent cells, a plurality of sectors formed by dividing the inside of the cell by a plurality of partition lines between the center of the cell and the cell boundary, and the plurality of sectors A subband allocated to a terminal located at the cell boundary and a subband allocated to a terminal located at the sector boundary are different from each other.

According to another aspect of the present invention, there is provided a resource allocation method in a cell-based mobile communication system. The entire frequency band allocated for communication between the base station and the terminal in the cell is divided into a plurality of subbands, and any one of the plurality of subbands is allocated, and the base station and the base station through the allocated subbands. Performing data communication. The cell includes a cell boundary affected by interference from adjacent cells, a plurality of sectors formed by dividing the inside of the cell by a plurality of partition lines between the center of the cell and the cell boundary, and the plurality of sectors The subbands are divided into sector boundaries which affect interference, and the subbands allocated by the terminal located in the cell boundary and the subbands allocated by the terminal located in the sector boundary are different from each other.

It reduces interference that may occur in cell boundary or sector boundary, and improves performance and scheduling flexibility by using the most optimized partial frequency reuse method for the frequency band allocated to each position.

1 is a block diagram illustrating partial frequency reuse.

2 is a block diagram illustrating a cell structure according to an embodiment of the present invention.

3 is a block diagram illustrating a cell structure according to another example of the present invention.

4 is a block diagram illustrating a resource allocation method according to an embodiment of the present invention.

5 is a block diagram illustrating a resource allocation method according to another embodiment of the present invention.

6 is a block diagram illustrating a resource allocation method in the cell structure of FIG. 2 according to an embodiment of the present invention.

7 is a block diagram illustrating a resource allocation method in the cell structure of FIG. 2 according to another example of the present invention.

8 is a block diagram illustrating a resource allocation method in the cell structure of FIG. 2 according to another embodiment of the present invention.

9 is a block diagram illustrating a resource allocation method in the cell structure of FIG. 2 according to another embodiment of the present invention.

10 is a block diagram illustrating a method of classifying frequency bands allocated for each cell position according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like numbers refer to like elements throughout.

The following techniques can be used in various communication systems. Communication systems are widely deployed to provide various communication services such as voice, packet data, and the like. This technique can be used for downlink or uplink. Downlink means communication from a base station (BS) to a mobile station (MS), and uplink means communication from a terminal to a base station. A base station generally refers to a fixed station for communicating with a terminal and may be referred to as other terminology such as a node-B, a base transceiver system (BTS), an access point, or the like. The terminal may be fixed or mobile and may be called in other terms such as user equipment (UE), user terminal (UT), subscriber station (SS), wireless device (wireless device), and the like.

The present invention can be applied to any multiple access scheme that requires frequency division for multiple access. Multiple access schemes include frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), multi-carrier code division multiple access (MC-CDMA), and combinations thereof.

More specifically with regard to OFDM / OFDMA based systems, OFDM uses multiple orthogonal subcarriers. OFDM uses orthogonality between an inverse fast Fourier Transform (IFFT) and a Fast Fourier Transform (FFT). At the transmitter, data is transmitted by performing an IFFT. The receiver performs FFT on the received signal to recover the original data. The transmitter uses an IFFT to combine multiple subcarriers, and the receiver uses a corresponding FFT to separate multiple subcarriers.

1 is a block diagram illustrating partial frequency reuse. Hereinafter, the cell boundary is defined as a concept encompassing an area near a cell boundary in which an interference signal affects an adjacent cell. In addition, the cell center area is defined as a concept encompassing an area near the cell center where the interference signal is not affected by the adjacent cell.

Referring to FIG. 1, partial frequency reuse (FFR) is a method of using various frequency reuse coefficients in one cell or sector using orthogonality of subcarriers in an OFDM system. When the total frequency band available to the base station in each cell is F, in order to prevent intercell interference, the base stations of each cell have different frequencies f1 (for cell A), f2 (for cell B), Use f3 (for cell C). That is, since the cell boundary is easily affected by interference from neighboring cells, the frequency reuse factor 3 is applied to the cell boundary so that the bands do not overlap with the neighboring cells.

On the other hand, in the cell center region, since the distance to the adjacent cell is secured to some extent and the strength of the interference signal is weak, the frequency reuse factor 1 is applied to the center of each cell.

As such, only a portion of the entire frequency band may be allocated to a terminal located at a cell boundary affected by interference from neighboring cells, and the entire frequency band may be allocated to a terminal located in a cell center region that is less affected by inter-cell interference from the neighboring cell. This effectively prevents intercell interference and increases the capacity of the system.

2 is a block diagram illustrating a cell structure according to an embodiment of the present invention.

Referring to FIG. 2, cell A is largely divided into a cell boundary, a plurality of sectors, and a sector boundary. The base station BS is located at the center of cell A. The cell boundary may literally mean a boundary formed by the cell A with other adjacent cells. Alternatively, the cell boundary may mean an area affected by interference from cells B and C, which are cells adjacent to the cell A. When the cell boundary is determined by the influence of the interference, the influence of the interference may be grasped based on a signal to interference noise ratio (SINR). The extent to which the influence of interference does not form a cell boundary is an implementation problem and is not a limitation in the present invention. Hereinafter, the cell boundary will be described on the assumption that it means an area affected by interference from another cell.

A sector is an area in which the inside of the cell is divided by a plurality of partition lines between the center of the cell A and the cell boundary. Three partition lines are drawn from the center of the cell A to the cell boundary, and the three partition lines divide the inside of the cell A into sectors a, sector b and sector c. The criteria for classifying sectors may be determined by characteristics of the antenna provided in the base station. In particular, when a beamforming antenna or a directional antenna is used, data may be efficiently transmitted when the inside of the cell is divided into sectors as described above.

The sector boundary is an area in which adjacent sectors of the plurality of sectors influence each other. One side of the sector a is adjacent to the sector b, the other side to the sector c. One side of the sector b is adjacent to sector a and the other side to sector c. One side of sector c is adjacent to sector a and the other side is adjacent to sector c. In other words, each sector may be affected by interference in adjacent sectors or may be affected by interference from adjacent sectors. The area affected by the interference from adjacent sectors is called a sector boundary.

The sector boundary of sector x affected by the interference by sector y will be referred to as sector boundary (x, y) for convenience. For example, sector boundary (b, c) is a sector boundary affected by interference by sector c as sector boundary of sector b, and sector boundary (b, a) is interference by sector a as sector boundary of sector b. Sector boundary affected by. As the cell boundary, the cell boundary of the portion adjacent to the sector x is called the cell boundary of the sector x.

As such, one cell is divided into a cell boundary, a sector boundary, and a plurality of sectors, and the terminal may be located at any one of them.

When a cell is divided into a plurality of sectors and the same frequency band is used for each sector, interference between the sectors may be affected. Accordingly, when the sector boundaries are separately divided in the cell and separately managed in the frequency region allocated to the terminal located in the sector boundary, interference between the sectors may be reduced, and the overall frequency use efficiency may be increased. In other words, allocating a separate subband to a cell boundary in a cell is to avoid interference with other adjacent cells, and allocating a separate subband to a sector boundary is to avoid interference with other sectors in the same cell. to be.

The benefits of distinguishing frequencies allocated to terminals located in cell boundaries and sector boundaries are as follows. First, the number of dominant interferers may vary according to a cell boundary and a terminal of a sector boundary. Second, terminals located in the sector boundary are related to the same base station (BS), while terminals located in the cell boundary are related to different serving BSs. Third, terminals located in the cell boundary may have different signal strengths with respect to the beam pattern of the directional antenna instead of showing similar path loss characteristics. On the other hand, the terminals located in the sector boundary may have different path loss characteristics instead of having similar signal strength with respect to the beam pattern of the directional antenna.

Although only the cell structure of cell A is illustrated in FIG. 2, the structure of cell A may be applied to cell structures of cells B, C, and D. In addition, the plurality of sectors may not necessarily be divided into three in the cell, but may be divided into three or less or more. Although the cell boundary and the area of the sector boundary are the same, this is merely an example, since the cell boundary and the area affecting the interference from the adjacent sector are arbitrarily shown.

3 is a block diagram illustrating a cell structure according to another example of the present invention.

Referring to FIG. 3, only one sector and a cell boundary adjacent to the one sector in FIG. 2 are partially shown. The cell structure of FIG. 3 is the same in that a cell boundary and a sector exist in a cell compared to FIG. 2, but there is a difference in that a sector boundary does not exist separately. That is, a cell is divided into a cell boundary and a plurality of sectors, and one sector is divided into a left sector and a right sector.

4 is a block diagram illustrating a resource allocation method according to an embodiment of the present invention.

Referring to FIG. 4, the entire frequency band is a frequency resource allocated to terminals located in one cell by scheduling. The entire frequency band may be a logical frequency band or a physical frequency band. The entire frequency band includes a continuous subcarrier. The entire frequency band is divided into two subbands, wherein a first subband is allocated to terminals located in a sector boundary (hereinafter referred to as sector boundary terminals), and a second subband is assigned to a terminal located in a cell boundary (hereinafter referred to as cell boundary). Terminals). Meanwhile, terminals located in sectors (hereinafter referred to as terminals in sectors) are allocated the remaining bands to the cell boundary terminals and the sector boundary terminals among the entire frequency bands. This is a resource allocation method that can be applied to all of the cell structure of FIG.

5 is a block diagram illustrating a resource allocation method according to another embodiment of the present invention.

Referring to FIG. 5, the entire frequency band is divided into three subbands, wherein a first subband is allocated to sector boundary terminals, a second subband is allocated to cell boundary terminals, and a third subband. Is assigned to terminals in the sector. That is, partial bands allocated in the entire frequency band may be different depending on where each terminal is located in the cell. The positions of the three subbands are not necessarily limited to those shown in the drawings, and may be interchanged with each other, and bandwidths may be different. This is a resource allocation method that can be applied to the cell structure of FIG.

As shown in FIG. 4 or 5, a structure in which the entire frequency band is divided into two or three subbands is commonly applied to all cells. For example, cell boundary terminals of each cell may be allocated the same partial band of all frequency bands. That is, the cell boundary terminal of cell A and the cell boundary terminal of cell B may use the same partial band. In this case, since the cell boundary terminal of the cell A may be affected by the interference by the cell boundary terminal of the cell B (or vice versa), an appropriate frequency reuse factor should be selected to control the interference.

On the other hand, the sector boundary terminals of each cell may also be allocated the same partial band of all frequency bands. However, since a sector has a small influence of interference on a sector of another cell and a large influence of interference between adjacent sectors in a cell, interference between adjacent sectors in a cell should be reduced. That is, in the case of the partial band allocated to the cell boundary terminal, resources are allocated in consideration of the partial band allocated to the cell boundary terminal of another cell, and the partial band allocated to the sector boundary terminal is considered in the sector of the same cell. It needs to be designed to allocate resources.

6 is a block diagram illustrating a resource allocation method in the cell structure of FIG. 2 according to an embodiment of the present invention. This is the case where the frequency band allocated to the cell boundary terminal and the frequency band allocated to the sector boundary terminal are the same for each cell.

Referring to FIG. 6, it can be seen that a partial band allocated in the entire frequency band may vary according to which position the UE is in one cell A. The first block diagram from the top shows the partial bands allocated to the terminal located in the sector boundary (a, b) or (a, c) and the terminal located in the cell boundary of sector a, and the second block diagram from the top shows the sector boundary (b, c) Or a partial band allocated to a terminal located at (b, a) and a terminal located at a cell boundary of sector b, and the third block diagram above shows a terminal and sector c located at sector boundary (c, b) or (c, a). Represents a partial band allocated to the terminal located at the cell boundary of.

The sector boundary terminal may be allocated any one of the first to third subbands, and the terminal located in the cell boundary may be allocated any one of the fourth to sixth subbands. However, as described above, the sector boundary terminal is regularly allocated partial bands in consideration of interference with other sector boundary terminals, and the cell boundary terminal in consideration of interference with cell boundary terminals of other cells.

The UE located in the sector boundary (a, b) may be allocated any one of the first to third subbands. If a second partial band is allocated to a terminal located at the sector boundary (a, b), the partial band should be allocated to the terminal located at another sector boundary to minimize interference. The sector boundaries (b, a) are adjacent to the sector boundaries (a, b) (see Fig. 2) and thus are affected by interference with each other. Therefore, a terminal located at sector boundary (b, a) must be allocated a different subband (first partial band or third partial band) from the terminal located at sector boundary (a, b).

According to the same rule, a terminal located in sector boundary (c, a) and a terminal located in sector boundary (a, c) should be allocated different subbands, and the terminal located in sector boundary (b, c) and the sector boundary ( Terminals located in c, b) should be allocated different subbands. That is, the frequency reuse factor 2/3 is applied to the sector boundary terminal. Under this rule, the partial band allocated to the terminal located in each sector boundary may be represented as shown in FIG. However, this is only an example, and any combination of partial bands satisfying the above rule may be included in the technical scope of the present invention.

Meanwhile, the frequency reuse factor 1/3 is applied to the terminals located in the cell boundary. That is, a fourth subband is allocated to the terminal located at the cell boundary of the sector a, a sixth subband is allocated to the terminal located at the cell boundary of the sector b, and a fifth subband is allocated to the terminal located at the cell boundary of the sector c.

After the partial bands are allocated to both the sector boundary terminal and the cell boundary terminal, the remaining partial bands (third, fifth and sixth subbands in the case of sector a) may be allocated to the terminals located in the sector (FIG. 4). Reference).

7 is a block diagram illustrating a resource allocation method in the cell structure of FIG. 2 according to another example of the present invention. This is the case where the frequency band allocated to the cell boundary terminal and the frequency band allocated to the sector boundary terminal are different for each cell.

Referring to FIG. 7, cells A, B, and C each allocate an exclusive partial band to a cell boundary terminal. That is, each cell uses the entire frequency band by applying a frequency reuse factor of 1/3 to the cell boundary terminal. Meanwhile, the cell A allocates the remaining frequency bands excluding the partial bands allocated to the cell boundary terminals to the sector boundary terminals to minimize interference by applying a frequency reuse factor of 2/3 (see FIG. 6). Similarly, cell B allocates the remaining frequency bands other than the partial bands allocated to the cell boundary terminals to the sector boundary terminals so that interference is minimized by applying a frequency reuse factor of 2/3, and cell C is a portion allocated to the cell boundary terminals. The remaining frequency bands other than the bands are allocated to the sector boundary terminals to minimize interference by applying a frequency reuse factor of 2/3.

Compared with the resource allocation method in FIG. 6, since the overall area classification is less, scheduling flexibility may be further increased. After the partial bands are allocated to both the sector boundary terminal and the cell boundary terminal, the remaining partial bands may be allocated to the terminal located in the sector (see FIG. 4). Of course, the remaining subbands may be allocated to other sector boundary terminals or other cell boundary terminals which are not affected by interference.

By distinguishing the frequency bands allocated to the cell boundary terminal and the sector boundary terminal from each other, the cell boundary terminal and the sector boundary terminal have different interference-limited environments (the number of different dominant interferences and the beam patterns of the directional antennas). Different signal strengths, different path losses, etc.) can be used efficiently. That is, the most optimized partial frequency reuse method and interference cancellation technique can be used for the frequency band allocated to each position in the cell. In addition, the frequency band allocated to each location may be matched between cells, or may not be matched, thereby improving performance and scheduler flexibility.

8 is a block diagram illustrating a resource allocation method in the cell structure of FIG. 2 according to another embodiment of the present invention. This is a case where a frequency band allocated to a cell boundary terminal and a frequency band allocated to a sector boundary terminal are different for each cell, and a frequency band allocated to a terminal located in a sector is separately provided.

Referring to FIG. 8, cells A, B, and C all allocate a first subband to a terminal in a sector. On the other hand, cells A, B, and C divide the remaining frequency bands other than the first partial band from the entire frequency band by three and allocate the mutually exclusive partial bands to cell boundary terminals. That is, each cell is used by applying a frequency reuse factor of 1/3 to the cell boundary terminal.

Meanwhile, the cell A allocates the third to fifth partial bands to the sector boundary terminals, and the allocation rule is to exclusively allocate the partial bands by applying a frequency reuse factor of 2/3 to prevent interference between adjacent sector boundaries. will be.

In case of using a resource allocation method for separately preparing a partial band allocated to an intra-sector terminal, an additional yield gain may be obtained in a partial band allocated to the intra-sector terminal by a technique such as uplink Collaborative Spatial Multiplexing (CSM).

9 is a block diagram illustrating a resource allocation method in the cell structure of FIG. 2 according to another embodiment of the present invention.

Referring to FIG. 9, a total frequency band used by cells A, B, and C is divided into a partial band allocated to a terminal within a sector, a partial band allocated to a sector boundary terminal, and a partial band allocated to a cell boundary terminal. 8 is the same as the resource allocation method in FIG. 8, but there is a difference in the combination of partial bands allocated to the sector boundary terminal. This is to achieve macro diversity in sector boundaries. Accordingly, the same subbands are allocated to sector boundary terminals adjacent to each other.

In cell A, the sector boundaries (a, c) and the sector boundaries (c, a) are adjacent to each other, and the terminals in these two positions are allocated the same subband. Similarly, the same partial band is allocated between sector boundaries (a, b) and (b, a), and the same partial band is allocated between sector boundaries (a, c) and (c, a), and the sector boundaries (b, c) And the same subband is allocated between (c, b).

If the traffic load is high, the resources are designed to be allocated according to the structure as shown in FIG. 8, and if the traffic load is low, the resources are designed to be allocated according to the structure as shown in FIG. Can be changed.

The various resource allocation methods presented in FIGS. 6 to 9 can be adaptively adjusted in association with traffic load in an actual system. For example, the resource allocation method of FIG. 7 in which a partial band for a terminal in a sector exists separately may be used in view of increasing throughput for a terminal in a sector, and the coverage of a cell boundary or a sector boundary terminal may be used. The resource allocation method of FIG. 5 or 6 may be used in view of coverage or even quality of service (QoS).

10 is a block diagram illustrating a method of classifying frequency bands allocated for each cell position according to an embodiment of the present invention.

Referring to FIG. 10, a start position of a partial band allocated to a cell boundary terminal, a start position of a partial band allocated to a sector boundary terminal, and a start position of a partial band allocated to a terminal in a sector are given for each cell in a given total frequency band. It can be determined differently. Only the start position of the partial band allocated to the terminal of the position in the cell may be given and the end position thereof may not be given.

When the start position and the end position of the partial band allocated to the terminal of each position are determined, since a clear frequency band is known according to each position, it is efficient to design to avoid the interference between cells or sectors in association with frequency reuse. However, in certain cases, depending on the traffic load, in some cases, an area may be left, and in some cases, an area may be insufficient. Therefore, in order to guarantee the flexibility of the traffic load, each subband is not divided into a start position and an end position.

The starting position of the partial band allocated to the cell boundary terminal in cell A is x, the starting position of the partial band allocated to the cell boundary terminal in cell B is y, and the starting position of the partial band allocated to the cell boundary terminal in cell C Is z. Resource allocation in each subband starts from the subband start position.

All of the above functions may be performed by a processor such as a microprocessor, a controller, a microcontroller, an application specific integrated circuit (ASIC), or the like according to software or program code coded to perform the function. The design, development and implementation of the code will be apparent to those skilled in the art based on the description of the present invention.

Although the present invention has been described above with reference to the embodiments, it will be apparent to those skilled in the art that the present invention may be modified and changed in various ways without departing from the spirit and scope of the present invention. I can understand. Therefore, the present invention is not limited to the above-described embodiment, and the present invention will include all embodiments within the scope of the following claims.

Claims (16)

Dividing an entire frequency band allocated for communication between a base station and a terminal in a cell into a plurality of partial bands; And Allocating one of the plurality of partial bands to the terminal; The cell includes a cell boundary affected by interference from adjacent cells, a plurality of sectors formed by dividing the inside of the cell by a plurality of partition lines between the center of the cell and the cell boundary, and the plurality of sectors And a partial band allocated to a terminal located at the cell boundary and a partial band allocated to a terminal located at the sector boundary, which are divided into sector boundaries affecting interference. The method of claim 1, And a partial band allocated to a terminal located at the cell boundary, a partial band allocated to a terminal located at the sector boundary, and a partial band allocated to the terminal located at the plurality of sectors. The method of claim 1, The entire frequency band is allocated to a terminal located in the plurality of sectors. The method of claim 1, And a partial band allocated to a terminal located in a portion adjacent to the first sector of the cell boundary and a partial band allocated to a terminal located in the portion adjacent to the second sector of the cell boundary. The method of claim 1, And the partial band allocated to the terminal located in the cell boundary adjacent to the first sector and the partial band allocated to the terminal located in the cell boundary adjacent to the second sector. The method of claim 1, The partial band allocated to the terminal located at the cell boundary and the partial band allocated to the terminal located at the cell boundary of a cell adjacent to the cell are different. The method of claim 1, Different subbands are allocated to a terminal located in a first sector boundary affected by interference from a sector adjacent to one side of the sector and a terminal located in a second sector boundary affected by interference from a sector adjacent to the other side of the sector. Assignment method. The method of claim 7, wherein A terminal located in the first sector boundary and a terminal located in a third sector boundary adjacent to one side of the sector and affected by interference by the sector are allocated different subbands. The method of claim 7, wherein A terminal located at the first sector boundary and a terminal located at a fourth sector boundary adjacent to the other side of the sector and affected by interference by the sector are allocated different subbands. A total frequency band allocated for communication between a base station and a terminal in a cell is divided into a plurality of subbands, and any one of the plurality of subbands is allocated; And Performing data communication with the base station through the allocated partial band, The cell includes a cell boundary affected by interference from adjacent cells, a plurality of sectors formed by dividing the inside of the cell by a plurality of partition lines between the center of the cell and the cell boundary, and the plurality of sectors And a subband allocated by a terminal located at the cell boundary and a subband allocated by a terminal located at the sector boundary are different from each other. The method of claim 10, The partial band allocated to the terminal located in the portion adjacent to the first sector of the cell boundary and the partial band allocated to the terminal located in the portion adjacent to the second sector of the cell boundary are different. The method of claim 10, The partial band allocated by the terminal located in the cell boundary adjacent to the first sector and the partial band allocated by the terminal located in the cell boundary adjacent to the second sector are the same. The method of claim 10, The partial band allocated to the terminal located in the cell boundary and the partial band allocated to the terminal located in the cell boundary of the cell adjacent to the cell are different. The method of claim 1, A terminal located in a first sector boundary affected by interference from a sector adjacent to one side of a sector and a terminal located in a second sector boundary affected by interference from a sector adjacent to another sector of the sector are allocated different subbands. Assignment method. The method of claim 14, And a terminal located in the first sector boundary and a terminal located in a third sector boundary adjacent to one side of the sector and affected by interference by the sector are allocated different subbands. The method of claim 14, And a terminal located at the first sector boundary and a terminal located at a fourth sector boundary adjacent to the other side of the sector and affected by interference by the sector are allocated different subbands.