WO2018139714A1

WO2018139714A1 - Apparatus and method for uplink scheduling in tdd cellular network

Info

Publication number: WO2018139714A1
Application number: PCT/KR2017/005680
Authority: WO
Inventors: 반태원; 조문제
Original assignee: 경상대학교산학협력단
Priority date: 2017-01-25
Filing date: 2017-05-31
Publication date: 2018-08-02
Also published as: KR20180087640A; KR101906918B1

Abstract

Disclosed is an uplink scheduling scheme which calculates a signal to maximum interference ratio by using only one interference signal with the greatest strength from among interference signals transmitted to a plurality of base stations adjacent to a terminal, and performs uplink scheduling on the basis of the signal to maximum interference ratio. The disclosed uplink scheduling scheme accurately estimates the strength of an interference signal transmitted to a base station adjacent to a terminal by using symmetry between an uplink and a downlink, and performs uplink scheduling by using the same so that intercell interference may significantly be reduced from the uplink by performing effective scheduling only with a simple calculation.

Description

Uplink Scheduling Apparatus and Method in TDD Cellular Network

The following embodiments relate to an apparatus and method for performing uplink scheduling in a TDD cellular network, and more particularly, to an apparatus and method for performing uplink scheduling based on an amount of inter-cell interference transmitted from a terminal to another cell.

In a next-generation mobile communication network, a large number of base stations are arranged in a narrow space, thereby increasing space reuse rate, and thus, data transmission capacity may be significantly improved. However, as the space reuse rate increases in the wireless network, interference between users or base stations in the network increases rapidly, resulting in a decrease in frequency efficiency. In the downlink where the base station is the transmitter, the location of the base station is fixed and the transmitter directly performs various transmission control functions. Therefore, it is easy to cope with such an interference situation, while in the uplink where the terminal is the transmitter, the position of the transmitter is a cell. Not only does it change every moment, but since the terminal serving as a transmitter and the base station performing the transmission control function are separated, performance deterioration due to interference becomes apparent. In particular, the max signal-to-noise ratio (SNR) scheduling scheme, which considers only channel information with a base station to which a terminal is connected, does not consider any interference effect on a neighboring cell in uplink and performs the performance of the entire network due to interference. The degradation is more serious. In order to solve this interference problem, various uplink scheduling techniques have been studied.

The purpose of the following embodiments is to perform uplink scheduling with a small amount of computation.

The purpose of the following embodiments is to perform uplink scheduling for more terminals using limited computing resources.

According to an exemplary embodiment, in a scheduling apparatus for performing uplink scheduling for a plurality of terminals located in a cell, a strength of a signal transmitted by the plurality of terminals to a base station of the cell and a plurality of adjacent terminals Among the interference signals transmitted to the cell, the plurality of terminals based on the receiver and the received signal-to-interference ratios, respectively, for receiving signal-to-interference ratios calculated based on the largest interference signal having the greatest strength from the plurality of terminals. There is provided a scheduling apparatus including a scheduling unit configured to determine a time interval for performing uplink scheduling for the plurality of terminals to transmit the uplink data to the base station in the cell.

Here, the maximum interference signal may be estimated based on the strength of pilot signals received by the terminals from the plurality of adjacent cells.

The apparatus may further include a scheduling information transmitter configured to transmit the information about the determined time interval to the plurality of terminals.

In addition, the uplink data may be transmitted from the terminal to the base station in the cell during the determined time interval.

Here, the uplink and the downlink at which the terminals receive data from the base station may be divided in time-division duplex.

According to another exemplary embodiment, in a terminal located in a first cell, strength of uplink interference signals transmitted by the terminal to a second cell adjacent to the first cell and a third cell adjacent to the first cell is increased. An interference signal strength estimator for estimating the strength of the strongest interference signal, a calculator for calculating a signal-to-interference ratio based on the strength of the signal transmitted from the terminal to the first cell and the strength of the interference signal having the strongest intensity, Information about a time interval for transmitting the uplink data to the base station of the first cell, the terminal is determined based on the transmission unit for transmitting the calculated signal-to-interference ratio to the scheduling apparatus of the first cell and the transmitted signal-to-interference ratio And a scheduling information receiving unit for receiving the link information, wherein the transmitting unit stores the link data during a time interval for transmitting the uplink data. The terminal transmitting to the base station of the first cell is provided.

The apparatus may further include a pilot receiver configured to receive a first pilot signal from a second cell adjacent to the first cell and receive a second pilot signal from a third cell adjacent to the first cell.

In addition, the strength of the uplink interference signal transmitted to the second cell and the third cell may be estimated based on the strength of the first pilot signal and the strength of the second pilot signal.

According to another exemplary embodiment, in the scheduling method of performing uplink scheduling for a plurality of terminals located in a cell, the strength of a signal transmitted by the plurality of terminals to a base station of the cell and the terminals are adjacent to each other. Among the interference signals transmitted to a plurality of cells, receiving the signal-to-interference ratios calculated based on the largest interference signal having the largest intensity from the plurality of terminals, respectively, and the plurality of the plurality of signals based on the received signal-to-interference ratios. A scheduling method is provided including performing uplink scheduling for terminals to determine a time interval during which the plurality of terminals transmit uplink data to a base station in the cell.

The method may further include transmitting information on the determined time interval to the plurality of terminals.

According to the following embodiments, terminals in a TDD cellular network can perform uplink scheduling with less energy consumption.

According to the following embodiments, terminals in a TDD cellular network may perform uplink scheduling using limited computing resources.

1 is a diagram illustrating a concept in which a terminal located in a first cell transmits uplink interference to base stations of a second cell and a third cell adjacent to the first cell.

2 is a flowchart illustrating a method of performing uplink scheduling step by step according to an exemplary embodiment.

3 illustrates a concept in which a terminal located in each cell transmits uplink interference to a base station of an adjacent cell.

4 is a block diagram illustrating a structure of an uplink scheduling apparatus according to an exemplary embodiment.

Fig. 5 is a flowchart illustrating step by step an uplink scheduling method according to an exemplary embodiment.

Fig. 6 is a block diagram showing the structure of a terminal according to an exemplary embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a concept in which a terminal located in a first cell transmits uplink interference to base stations of a second cell and a third cell adjacent to the first cell. Although only three

base stations

111, 121, 131 and three

cells

110, 120, 130 are illustrated in FIG. 1, the exemplary embodiment may be applied to a large wireless network including K base stations and cells.

In FIG. 1, each

cell

110, 120, 130 includes a

base station

111, 121, 131, and each

base station

111, 121, 131 is a terminal located within the

cell

110, 120, 130. Only the transmission control of the

fields

112, 122, and 132 is performed. Time-division duplex distinguishes the downlink (downlink, forward link) and uplink (uplink, reverse link) in which each of the

base stations

111, 121, and 131 communicates with the

terminals

112, 122, and 132. do.

In FIG. 1, the first terminal 112 located in the first cell 110 may transmit uplink data to the first base station 111. The uplink data transmitted by the first terminal 112 is transmitted not only to the first base station 111 but also to the second base station 121 of the second cell 120. In addition, the uplink data transmitted by the first terminal 112 is also transmitted to the third base station 131 of the third cell 130.

Of the uplink data transmitted by the first terminal 112, the data transmitted to the second base station 121, the third base station 131 is in accordance with the uplink data received by each base station (121, 131) from other terminals Act as interference to If the uplink interference to the base station (121, 131) located in the other cell is increased, the efficiency and performance of the entire communication system is reduced, so preventing this is considered as an important technical issue.

According to one side, by controlling the data transmission time of each of the terminals (112, 122, 132), interference transmitted to the base stations (111, 121, 131) located in other terminals or other cells (110, 120, 130) The influence of the signal can be minimized.

Hereinafter, in the present specification, by controlling the data transmission time of each terminal (112, 122, 132), the influence of the interference signal transmitted to the base stations (111, 121, 131) located in the other cells (110, 120, 130) We propose a scheduling technique that minimizes

In FIG. 2, the cell in which the terminal 230 is located includes a serving base station, and the terminal 230 exchanges data and control information with the serving base station. The cell in which the terminal 230 is located is adjacent to the first neighbor cell including the first neighbor base station 210 and the second neighbor cell including the second neighbor base station 220. The uplink data transmitted by the terminal 230 acts as an interference to the first neighbor base station 210 and the second neighbor base station 220.

In step 250, the first neighbor base station 210 transmits a first pilot signal and the second neighbor base station 220 transmits a second pilot signal. The terminal 230 receives the first pilot signal and the second pilot signal.

In step 260, the terminal 230 calculates the strength of the first pilot signal and the second pilot signal, respectively.

In operation 261, the terminal 230 measures the strength of an interference signal transmitted by the terminal 230 to a plurality of

adjacent base stations

210 and 220 based on the strength of each pilot signal. According to one side, the power for transmitting the first pilot signal from the first neighboring base station 210 and the power for transmitting the second pilot signal from the second neighboring base station 220 may be known. The terminal 230 uses the strength of the first pilot signal received by the terminal 230 and the power of the first neighboring base station 210 to transmit the first pilot signal, and the first neighboring base station 210 and the terminal 230. Path loss between the channel and channel loss.

In the cellular communication system illustrated in FIG. 2, since the uplink and the downlink are distinguished in time (TDD), the uplink and the downlink are reciprocity, and thus, the terminal 230 uses the downlink state. The state of can be estimated accurately.

The terminal 230 transmits uplink data transmitted from the terminal 230 to the base station using the path loss between the first neighboring base station 210 and the terminal 230 and the loss according to the channel state. In the case of transmission through a Tx, the magnitude of inter-cell interference (first uplink interference signal) may be estimated.

In a similar manner, the terminal may estimate the magnitude of the inter-cell interference (second uplink interference signal) when the uplink data transmitted from the terminal 230 to the base station is transmitted to the second neighboring base station 220.

The terminal 230 may include a first uplink interference signal transmitted from the terminal 230 to the first neighbor base station 210 and second uplink interference signals transmitted from the terminal 230 to the second neighbor base station 220. The strength of the interference signal having the strongest strength can be estimated.

In step 262, the terminal 230 calculates a signal-to-max generating interference ratio (SmGIR). The signal-to-maximum occurrence interference ratio is defined as the ratio of the largest value among the signals transmitted by the terminal 230 to the serving base station and inter-cell interference transmitted by the terminal 230, and the strength of the signal transmitted by the terminal to the serving base station. And a signal-to-interference ratio calculated based on a maximum interference signal having the largest intensity among interference signals transmitted by the terminal to a plurality of adjacent cells.

The terminal 230 calculates the signal-to-maximum generation interference ratio by using only the largest interference amount among the plurality of inter-cell interferences generated by the terminal 230.

In step 270, the terminal 230 transmits the signal-to-maximum occurrence interference ratio to the scheduling apparatus of the cell where the terminal 230 is located. According to one side, the terminal 230 may transmit the signal-to-maximum occurrence interference rate to the scheduling device 240 via the serving base station.

In operation 280, the scheduling apparatus 240 performs scheduling for the terminal 230 based on the signal-to-maximum occurrence interference ratio received from the terminal 230. For example, the scheduling apparatus 240 may receive the signal-to-maximum interference rate from not only the terminal 230 but also other terminals located in the cell where the terminal 230 is located. The scheduling apparatus 240 selects a terminal having a maximum value of the signal-to-maximum interference rate in a specific time interval as a terminal to transmit data to the serving base station in the specific time interval, and transmits the data among the plurality of terminals. The time interval can be determined.

In operation 290, the scheduling apparatus 240 transmits scheduling information including information about the determined time interval to the selected terminal.

In step 291, the terminal that has received the scheduling information may transmit uplink data to the serving base station during the time interval in which the terminal is determined to transmit data.

According to the embodiment shown in Figure 2, it is possible to accurately estimate the strength of the interference signal transmitted by the terminal to the adjacent base station using the symmetry of the uplink and downlink. Also, among the interference signals transmitted by the terminal to a plurality of adjacent base stations, the signal-to-maximum generation interference ratio is calculated using only one interference signal having the largest intensity. Therefore, the calculation of the signal-to-maximum occurrence interference ratio is very simple. In addition, since the size of the interference signal transmitted by the terminal to a plurality of adjacent base stations is greatly affected by the path loss, the largest interference signal changes much slower than the channel change rate due to fading. Therefore, the calculation burden of the terminal is greatly reduced. In addition, according to the embodiment shown in Figure 2, since the terminals of the small strength of the interference signal transmitted to the adjacent cell is selected to transmit data, the inter-cell interference in the uplink is reduced, the performance and efficiency of the communication system is greatly improved .

3 illustrates a concept in which a terminal located in each cell transmits uplink interference to a base station of an adjacent cell. Although only three

base stations

311, 321, and 331 and three

cells

310, 320, and 330 are illustrated in FIG. 3, an exemplary embodiment may be applied to a large wireless network including K base stations and cells. The

base stations

311, 321, 331 of each

cell

310, 320, 330 perform transmission control of the

terminals

312, 313, 322, 323, 332, 333 located in the corresponding

cells

310, 320, 330. do.

In FIG. 3, assuming block fading, it is assumed that channel information remains constant during a transport block for transmitting data, and that fading is changed probabilistic independently between all transport blocks.

Denotes a channel vector between the i-th terminal and the j-th base station located in the k-th cell.

ego,

to be. All channel vectors follow a complex Gaussian distribution with mean '0', variance '1', and can be assumed to be independent of each other.

The transmit power of all terminals

Can be assumed to be the same. In addition, the white Gaussian noise density

when,

May be defined as a Signal to Noise Ratio (SNR).

In FIG. 3, the total amount of interference generated by the i-th terminal located in the k-th cell to the adjacent base station may be expressed by Equation 1 below.

[Equation 1]

here,

Is the total amount of inter-cell interference generated by the i-th terminal located in the k-th cell to the adjacent base station, and j represents the index of the adjacent base station. The total amount of interference according to Equation 1 above is complicated to calculate and adds to the computational burden on the terminal.

According to an exemplary embodiment, the terminal may estimate only one interference having the greatest intensity among inter-cell interferences generated by the terminal as its generated interference amount as follows.

[Equation 2]

here,

Denotes the maximum value among the inter-cell interferences generated by the i-th terminal located in the k-th cell to the adjacent base station.

According to an exemplary embodiment, the terminal may calculate a signal-to-max generating interference ratio (SmGIR) using its generated interference estimated according to Equation 2.

The terminal feeds back the signal-to-occurrence interference ratio to the scheduling apparatus via the base station, and the scheduling apparatus may perform scheduling for the N terminals by using the signal-to-occurrence interference ratio fed back by the N terminals.

For example, the scheduling apparatus may select a terminal having the largest value among the signal-to-maximum generation interference ratios fed back by each terminal to transmit data.

In this case, the terminal selected by the scheduling device k may be expressed by Equation 3 below.

[Equation 3]

4 is a block diagram illustrating a structure of an uplink scheduling apparatus according to an exemplary embodiment. The uplink scheduling apparatus 410 according to the exemplary embodiment includes a receiver 420, a scheduler 430, and a scheduling information transmitter 440.

The uplink scheduling apparatus 410 illustrated in FIG. 4 performs uplink scheduling on a plurality of terminals 450 and 460 located in a cell.

The receiver 420 receives a signal-to-maximum interference rate from the terminals 450 and 460 in the cell in which the uplink scheduling apparatus 410 is responsible for scheduling. The signal-to-maximum occurrence interference ratio is defined as the ratio of the largest value among signals transmitted by the terminals 450 and 460 to the base station (serving base station) of the corresponding cell and inter-cell interference transmitted by the terminals 450 and 460. Among the interference signals transmitted by the terminals 450 and 460 to the serving base station and interference signals transmitted by the terminals 450 and 460 to a plurality of adjacent cells, the signal-to-interference ratio is calculated based on the largest interference signal having the largest intensity. .

Here, the maximum interference signal may be estimated based on the strength of pilot signals received by the terminals 450 and 460 from a plurality of adjacent cells. For example, each of the terminals 450 and 460 may receive a pilot signal from a plurality of adjacent cells and calculate its strength. If transmission power for transmitting pilot signals by a plurality of neighboring base stations is already known, the terminals 450 and 460 may simply estimate the path loss and channel state from each adjacent cell to the terminals 450 and 460. .

Since the uplink scheduling apparatus shown in FIG. 4 assumes a time-division duplex (TDD) case, the uplink and the downlink are symmetrical (eciprocity). The terminal can accurately calculate the strength of the uplink interference signal caused by the corresponding terminals 450 and 460 in the adjacent cells by using the symmetry of the uplink and the downlink.

The terminals 450 and 460 may calculate the amount of inter-cell interference caused to a plurality of adjacent cells, respectively, and select a maximum value therefrom to calculate a signal-to-maximum interference rate.

The scheduling unit 430 performs uplink scheduling for a plurality of terminals based on the received signal to interference ratio (signal to maximum occurrence interference ratio). The scheduling unit 430 may determine a time interval during which the terminals 450 and 460 transmit uplink data to the base station in the cell.

For example, the scheduling unit 430 selects the terminal 450, 460 that transmits the signal-to-maximum interference rate having the largest value among the signal-to-maximum occurrence interference rates fed back by each terminal 450, 460 and selects data. Can be sent.

The scheduling information transmitter 440 may transmit scheduling information, including information about the determined time interval, to the terminals 450 and 460. According to one side, uplink data may be transmitted from the determined terminal to the base station of the cell during the time interval determined above.

In step 510, the uplink scheduling apparatus receives a signal-to-maximum occurrence interference ratio from terminals in a cell in which the uplink scheduling apparatus is responsible for scheduling. The signal-to-maximum occurrence interference ratio is defined as the ratio of the largest value of the signal transmitted by the terminal to the base station (serving base station) of the cell and the inter-cell interference transmitted by the terminal, and the strength of the signal transmitted by the terminal to the serving base station. And a signal-to-interference ratio calculated based on a maximum interference signal having the largest intensity among interference signals transmitted by the terminal to a plurality of adjacent cells.

The uplink scheduling method shown in FIG. 5 assumes a time-division duplex (TDD: Time-Division Duplex) case in which the uplink and the downlink are symmetrical. The terminal can accurately calculate the strength of the uplink interference signal caused by the terminal to the adjacent cell by using the symmetry of the uplink and the downlink.

In step 520, the uplink scheduling apparatus performs uplink scheduling for a plurality of terminals based on the received signal-to-interference ratio (signal-to-maximal generation interference ratio). The uplink scheduling apparatus may determine a time interval in which each terminal transmits uplink data to a base station in a cell.

For example, the uplink scheduling apparatus may select a terminal that transmits the signal-to-maximum interference occurrence ratio having the largest value among the signal-to-maximum interference interference ratios fed back by each terminal to transmit data.

In operation 530, the uplink scheduling apparatus may transmit scheduling information, including information about the determined time interval, to each terminal. According to one side, uplink data may be transmitted from the determined terminal to the base station of the cell during the time interval determined above.

Fig. 6 is a block diagram showing the structure of a terminal according to an exemplary embodiment. The terminal 610 according to an exemplary embodiment includes a pilot receiver 620, an interference signal strength estimator 630, a calculator 640, a transmitter 650, and a receiver 660.

The terminal 610 illustrated in FIG. 6 is located in a first cell where the uplink scheduling apparatus 690 performs uplink scheduling.

The pilot receiver 620 receives the first pilot signal from the second cell adjacent to the first cell, and receives the second pilot signal from the third cell adjacent to the first cell. According to one side, the pilot receiver 620 receives the first pilot signal from the first neighbor base station 670 responsible for transmission control of the second cell, the second neighbor base station 680 responsible for transmission control of the third cell. ) May receive a second pilot signal.

The interference signal strength estimator 630 may estimate the strength of the uplink interference signal transmitted from the terminal 610 to the second cell and the third cell based on the strength of the first pilot signal and the strength of the second pilot signal. .

Since the terminal described with reference to FIG. 6 assumes a time-division duplex (TDD) case, the uplink and the downlink are symmetrical. The terminal can accurately calculate the strength of the uplink interference signal caused by the terminal to the adjacent cell by using the symmetry of the uplink and the downlink.

The calculator 640 calculates a signal-to-interference ratio based on the interference signal having the strongest intensity and the strength of the signal transmitted from the terminal 610 to the first cell. The signal-to-interference ratio is defined as the ratio of the largest value among the signals transmitted by the terminal 610 to the base station (serving base station) of the cell and the inter-cell interference transmitted by the terminal 610 to the adjacent cell. It can be called an interference ratio.

The transmitter 650 transmits the calculated signal to maximum occurrence interference ratio to the scheduling apparatus 690 of the first cell.

The scheduling apparatus 690 of the first cell receives the signal-to-maximum occurrence interference ratios calculated from the plurality of terminals located in the first cell, respectively, and based on the signal-to-maximum occurrence interference ratios, Uplink scheduling is performed for the terminals.

For example, the uplink scheduling apparatus 690 may select a terminal that has transmitted the signal-to-maximum interference ratio having the largest value among the signal-to-maximum interference ratios fed back by each terminal to transmit data.

The receiver 660 receives scheduling information including information on a time interval in which the terminal 610 transmits uplink data from the uplink scheduling apparatus 690 to the serving base station.

The transmitter 650 may transmit uplink data to the base station during the time interval designated for the terminal 610.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Of the interference signals transmitted by the terminal to a plurality of adjacent base stations, the signal to the maximum occurrence interference ratio is calculated using only one interference signal having the largest intensity, and the uplink scheduling is performed based on the signal to maximum occurrence interference ratio. Link scheduling scheme is disclosed. The disclosed uplink scheduling technique accurately estimates the strength of an interference signal transmitted from a mobile station to an adjacent base station by using symmetry between uplink and downlink, and performs uplink scheduling by using the uplink scheduling. Inter-cell interference in the link can be greatly reduced.

Claims

A scheduling apparatus for performing uplink scheduling for a plurality of terminals located in a cell,

The signal-to-interference ratios calculated based on the maximum interference signal having the greatest strength among the signal strengths transmitted by the plurality of terminals to the base station of the cell and the interference signals transmitted by the terminals to a plurality of adjacent cells, the plurality of terminals. Receiving unit for receiving from each; And

A scheduling unit configured to determine a time interval during which the plurality of terminals transmit uplink data to a base station in the cell by performing uplink scheduling on the plurality of terminals based on the received signal-to-interference ratios

Scheduling apparatus comprising a.
The method of claim 1,

And the maximum interference signal is estimated based on the strength of pilot signals received by the terminals from the plurality of adjacent cells.
The method of claim 1,

Scheduling information transmitter for transmitting the information on the determined time interval to the plurality of terminals

The scheduling apparatus further comprises.
The method of claim 3,

And the uplink data is transmitted from the terminal to the base station in the cell during the determined time interval.
The method of claim 1,

And a time-division duplex between the uplink and the downlink at which the terminals receive data from the base station.
In the terminal located in the first cell,

An interference signal strength estimator estimating an intensity of an interference signal having the strongest strength among uplink interference signals transmitted from the terminal to a second cell adjacent to the first cell and a third cell adjacent to the first cell;

A calculator for calculating a signal-to-interference ratio based on the strength of the signal transmitted from the terminal to the first cell and the strength of the interference signal having the strongest intensity;

A transmitter for transmitting the calculated signal-to-interference ratio to the scheduling apparatus of the first cell;

A scheduling information receiver configured to receive information on a time interval in which the terminal transmits uplink data to a base station of the first cell, determined based on the transmitted signal to interference ratio

Including,

The transmitter is a terminal for transmitting the link data to the base station of the first cell during the time interval for transmitting the uplink data.
The method of claim 6,

And a time-division duplex between the uplink and the downlink at which the terminals receive data from the base station.
The method of claim 6,

A pilot receiver configured to receive a first pilot signal from a second cell adjacent to the first cell and receive a second pilot signal from a third cell adjacent to the first cell

The terminal further comprising.
The method of claim 6, wherein the interference signal strength estimator,

And estimating the strength of an uplink interference signal transmitted to the second cell and the third cell based on the strength of the first pilot signal and the strength of the second pilot signal.
A scheduling method for performing uplink scheduling on a plurality of terminals located in a cell, the scheduling method comprising:

The signal-to-interference ratios calculated based on the maximum interference signal having the greatest strength among the signal strengths transmitted by the plurality of terminals to the base station of the cell and the interference signals transmitted by the terminals to a plurality of adjacent cells, the plurality of terminals. Receiving from each of them; And

Determining a time interval during which the plurality of terminals transmit uplink data to the base station in the cell by performing uplink scheduling on the plurality of terminals based on the received signal-to-interference ratios;

Scheduling method comprising a.
The method of claim 10,

The maximum interference signal is estimated by the terminals based on the strength of the pilot signal received from the plurality of adjacent cells.
The method of claim 10,

Transmitting the information on the determined time interval to the plurality of terminals;

The scheduling method further comprises.
The method of claim 12,

The uplink data is transmitted from the terminal to the base station in the cell during the determined time interval.
The method of claim 10,

The uplink and the downlink in which the terminals receive data from the base station is time-division duplex scheduling method.
A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 10-14.