KR20150092580A - Base station and control method thereof - Google Patents

Abstract

Disclosed in the present invention are a base station and an operation method of the base station. The base station has not only an effect of removing interference of a boundary between sections in an environment of forming two or more sectors separated by an antenna in one base station, but also an effect of improving impartiality of throughput of a terminal by efficiently distributing traffic between the sectors.

Description

TECHNICAL FIELD [0001] The present invention relates to a base station apparatus and a base station apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station apparatus and a base station apparatus, and more particularly to an apparatus and method for operating a base station apparatus and a base station apparatus in an environment of forming two or more sectors separated by an antenna at one base station, And more particularly, to a base station apparatus and an operation method of a base station apparatus capable of efficiently distributing traffic between sectors and enhancing fairness of throughput.

Recently, in the mobile communication environment, the growth of the LTE (Long Term Evolution) network has shifted the focus to the LTE network in the 3G service, WCDMA. In addition, introduction of various terminals capable of accessing the LTE network, The introduction of phones is accelerating.

In order to cope with the rapid increase of data traffic as the introduction of the smart phone accelerates, a sectorization system that separates one cell coverage into several sectors and operates the antenna through the antenna is required to be applied to the base station.

A base station employing a sectorization system scans a plurality of antenna beams for different directions for one cell coverage, thereby allowing sectors of multiple antenna beams to exist on one cell coverage.

For example, referring to FIG. 1, a base station 100 employing a sectoring system, in particular, a vertical sectoring system, includes two antennas (not shown) having mutually different vertical tilting angles, (S1, S2) of two antenna beams on one cell coverage C1 by scanning each of the antenna beams through two antennas (not shown) having different vertical tilting angles with respect to the cell coverage C1 of the cell coverage C1 ).

As described above, when a single cell coverage is divided into several sectors and operated in a base station to which the sectoring system is applied, a bandwidth allocation amount, that is, an allocable resource, increases for the same area, that is, one cell coverage. So that a higher data transmission rate can be obtained.

However, even when a sectoring system is applied, interference between sector boundaries within one cell coverage is still a problem to be solved.

1, when the sectors S1 and S2 are separated and operated in the vertical direction according to the application of the vertical sectoring system, the size of the sector S1 located in the center of the cell coverage C1, The number of terminals connected to the outer sector S2 is larger than that of the inner sector S1 due to the environmental characteristic that the size of the inner sector S1 is smaller than the size of the outer sector S2, There is a problem in that the traffic load of the outside sector S2 becomes larger than the load, and the traffic load imbalance between the sectors S1 and S2 becomes severe.

As a result, the gain in the inner sector S1, that is, the terminal throughput, can not be obtained in the outer sector S2 due to interference with the inner sector S1, traffic load imbalance, and environmental characteristics, The fairness of the terminal yield between S1 and S2 is also inferior.

Accordingly, in the present invention, in an environment in which two or more sectors separated by an antenna are formed in one base station, traffic between two or more sectors is effectively distributed while resolving interference between two or more sectors, This paper proposes a method to increase the fairness of

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the interference of two or more sector boundaries in an environment where two or more sectors are separated by an antenna at one base station And to provide an operation method of a base station apparatus and a base station apparatus capable of effectively distributing traffic between two or more sectors and improving fairness of throughput.

According to a first aspect of the present invention, there is provided a base station apparatus comprising: at least two antenna units forming two or more adjacent sectors; A candidate terminal confirmation unit for confirming a terminal located at a boundary between the at least two sectors as a candidate terminal; Based on a result of the resource allocation comparison in which resource allocation in the case of simultaneous transmission of data through the two or more sectors to the candidate terminal and resource allocation in the case of not performing simultaneous data transmission are compared, A target terminal determination unit for determining a candidate terminal as a target terminal; And a scheduling unit for scheduling the target terminal to simultaneously transmit data in each of the two or more sectors.

Preferably, the two or more antenna portions are two antenna portions having mutually different vertical tilting angles, and the two or more sectors include an outer sector formed vertically adjacent to the two antenna portions, And may be an inner sector.

The sector setting unit may set a sector having the largest traffic load among the two or more sectors as a reference sector and sets the remaining sectors excluding the reference sector as a neighboring sector among the two or more sectors.

Preferably, the target terminal determination unit determines all target terminals of the candidate sectors of the reference sector located in the reference sector among the candidate terminals, and determines, for the candidate terminals of the neighboring sectors located in the adjacent sectors, , And determine at least some candidate terminals as target terminals based on the resource allocation comparison result.

Preferably, the target terminal determination unit determines, in the case where the data concurrent transmission is performed using the number of candidate terminals in the adjacent sector, the number of candidate terminals in the reference sector, and the total number of terminals in the reference sector, Calculates a total amount of resources to be allocated to the candidate terminal, and if the simultaneous data transmission is not performed using the total amount of resources to be allocated to the candidate terminal, the number of candidate terminals in the adjacent sector, and the total number of terminals in the adjacent sector A first resource to be allocated to all terminals of the neighboring sector in the neighboring sector and a first resource to be allocated to each of the terminals in the neighboring sector excluding the candidate terminals of the neighboring sector in the neighboring sector, And if the first resource is larger than the second resource, determining all of the candidate terminals of the adjacent sector as an upper It can be determined to the destination terminal.

Preferably, when the first resource is smaller than the second resource, the target terminal determination unit subtracts the number of candidate terminals of the adjacent sector by a specified number and then subtracts the number of candidate terminals of the adjacent sectors subtracted by the specified number from And if the recalculated first resource is larger than the recalculated second resource, a part of candidate terminals of the candidate sector of the adjacent sector minus the specific number is re-calculated using the first resource and the second resource, As the target terminal.

The candidate candidate terminal may be a remaining candidate terminal obtained by subtracting the predetermined number of candidate terminals sequentially selected from the candidate terminals having the smallest interference from the candidate terminals having the smallest interference among the candidate terminals of the adjacent sector.

Preferably, the scheduling unit allocates resources to all of the reference sectors of the reference sector and each of the target sectors in the reference sector to schedule transmission of data, and allocates resources to each of the target sectors in the adjacent sector, Scheduling the same resource to allocate the same resource and transmit data simultaneously with the reference sector, and allocating remaining resources excluding the resources allocated to the target terminals by the reference sector to each of the remaining terminals, excluding the target terminal, among all terminals of the neighboring sector And scheduling to transmit data.

According to a second aspect of the present invention, there is provided a method of operating a base station apparatus, comprising: forming two or more sectors adjacent to each other in two or more antenna units; A candidate terminal identification step of identifying a terminal located at a boundary between the at least two sectors as a candidate terminal; Based on a result of the resource allocation comparison in which resource allocation in the case of simultaneous transmission of data through the two or more sectors to the candidate terminal and resource allocation in the case of not performing simultaneous data transmission are compared, Determining a candidate terminal as a target terminal; And a scheduling step of scheduling data to be transmitted simultaneously in each of the at least two sectors to the target terminal.

Preferably, the two or more antenna portions are two antenna portions having mutually different vertical tilting angles, and the two or more sectors include an outer sector formed vertically adjacent to the two antenna portions, And may be an inner sector.

Preferably, the method further comprises setting a sector having the largest traffic load among the two or more sectors as a reference sector, and setting the remaining sectors excluding the reference sector as a neighboring sector among the two or more sectors; Wherein the target terminal determination step includes a target terminal determination step of determining a target terminal of all candidate terminals of the reference sector located in the reference sector among the candidate terminals as a target terminal, The candidate terminal of the candidate sector may include a target terminal determination step of determining at least some candidate terminals as target terminals based on the resource allocation comparison result.

Preferably, the step of determining a target terminal of the neighbor sector may further comprise the steps of: when performing the simultaneous data transmission using the number of candidate terminals of the adjacent sector, the number of candidate terminals of the reference sector, Calculating a total amount of resources to be allocated to the candidate terminal in the reference sector, calculating a total amount of resources to be allocated to the candidate terminal, a number of candidate terminals in the adjacent sector, A first resource to be allocated to all terminals of the neighboring sector in the neighboring sector and a second resource to be allocated to the neighboring sector excluding the candidate terminal of the neighboring sector among all terminals of the neighboring sector A second resource to be allocated to each of the terminals, and when the first resource is larger than the second resource, It can be determined both by the end of the target terminal.

Preferably, when the first resource is smaller than the second resource, the target terminal determination step of the adjacent sector subtracts the number of candidate terminals of the adjacent sector by a predetermined number, Calculating a first resource and a second resource using the number of candidate terminals and, if the recalculated first resource is larger than the recalculated second resource, The candidate terminal can be determined as the target terminal.

Preferably, the scheduling step comprises: scheduling resources to be allocated to all the UEs of the reference sector and the target UEs in the reference sector to transmit data; and transmitting, to each of the target sectors, And allocating resources allocated to the target sectors by the reference sector to each of the other terminals except for the target terminal among all terminals of the neighboring sector excluding the resources allocated to the target terminals by the same sector And allocating remaining resources to schedule transmission of data.

According to the operation method of the base station apparatus and the base station apparatus of the present invention, not only the effect of solving the interference of the sector boundary in an environment of forming a sector separated by an antenna in one base station, And the effect of increasing the fairness of the throughput of the terminal can be achieved.

1 is a configuration diagram illustrating a communication system including a base station apparatus according to a preferred embodiment of the present invention.
2 is a block diagram illustrating a configuration of a base station apparatus according to a preferred embodiment of the present invention.
3 is a flowchart illustrating an operation method of a base station apparatus according to a preferred embodiment of the present invention.
FIG. 4 is a diagram illustrating an example of terminal scheduling for each sector formed in the base station apparatus according to the preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a communication system including a base station apparatus according to a preferred embodiment of the present invention.

The base station apparatus 100 of the present invention is a base station to which a sectoring system for separating and operating one cell coverage into a plurality of sectors is applied.

Prior to the detailed description, the base station apparatus 100 of the present invention can operate a plurality of cell coverage, and it is possible to operate separately in several sectors for some cell coverage or all cell coverage among a plurality of cell coverage.

Hereinafter, for convenience of explanation, only the cell coverage C1 of the base station apparatus 100 will be described as shown in FIG.

The base station apparatus 100 of the present invention employing the sectorization system scans several antenna beams for different directions for one cell coverage so that several sectors of multiple antenna beams exist on one cell coverage .

In particular, unlike the conventional horizontal sectoring, the base station apparatus 100 of the present invention includes two or more antenna units (not shown) having mutually different vertical tilting angles, It is desirable to support a vertical sectoring system that segregates and operates two or more sectors adjacent to each other.

Hereinafter, for convenience of explanation, as shown in FIG. 1, the base station apparatus 100 of the present invention includes two antenna units as two or more antenna units, and two or more sectors are vertically I will describe the sectorization system.

As shown in FIG. 1, the base station apparatus 100 of the present invention employing a vertical sectoring system includes two antenna units (not shown) having different vertical tilting angles, so that one cell coverage C1 The two sectors S1 and S2 can be separated and operated adjacent to each other in the vertical direction.

As described above, when the BS 100 separates one cell coverage C1 into a plurality of sectors S1 and S2, the BS 100 allocates a bandwidth allocation amount, that is, The resources that can be used are increased, so that a higher data transfer rate can be obtained.

However, the interference of the boundary between the sectors S1 and S2 in one cell coverage C1 is still a problem to be solved.

Further, due to the environmental characteristic that the size of the sector S1 located in the center of the cell coverage C1, that is, the inside of the cell coverage C1 is smaller than the size of the sector S2 located outside the cell coverage C1, The traffic load on the outer sector S2 becomes larger than the traffic load on the inner sector S1 because the number of terminals connected to the outer sector S2 is larger than the traffic load on the inner sector S1, This is a serious problem.

As a result, the gain in the inner sector S1, that is, the terminal throughput, can not be obtained in the outer sector S2 due to interference with the inner sector S1, traffic load imbalance, and environmental characteristics, The fairness of the terminal yield between S1 and S2 is also inferior.

Therefore, in the present invention, in an environment in which the vertical sectoring system is applied, not only the effect of resolving the interference of the boundary between the sectors S1 and S2, but also the efficiency of distributing the traffic between the sectors S1 and S2, And the effect of increasing the power of the base station apparatus.

Hereinafter, a configuration of a base station apparatus according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

The base station apparatus 100 according to the present invention includes two or more antenna units 110 forming two or more sectors adjacent to each other and a candidate terminal confirmation unit 120 Based on a result of resource allocation comparison in which resource allocation in the case of performing simultaneous data transmission through the two or more sectors to the candidate terminal and resource allocation in the case of not performing simultaneous data transmission is compared, And a scheduling unit 140 for scheduling the target terminal to simultaneously transmit data in each of the two or more sectors to the target terminal.

Two or more antenna units 110 form two or more sectors adjacent to each other.

That is, the two or more antenna units 110 can form two or more sectors adjacent to each other in the vertical direction with respect to the cell coverage C1, as different vertical tilting angles are set.

Of course, if two or more antenna units 110 are all set to the same vertical tilting angle, they will form two or more sectors overlapping each other for the cell coverage C1.

For example, as described with reference to FIG. 1, when two sectors S1 and S2 are used as two or more sectors, two or more antenna units 110 may include two antenna units, for example, 2, and two or more sectors may be divided into two sectors S1 and S2, which are vertically adjacently formed by the antenna units 1 and 2 with respect to the cell coverage C1, ) Sector S2 and an inner sector S2.

1, the size of the inner sector S1 near the center of the cell coverage C1 is smaller than the size of the outer sector S2 near the outer side of the cell coverage C1.

Hereinafter, for convenience of description, the two sectors S1 and S2 adjacent in the vertical direction as in Fig. 1 will be described as an example.

The candidate terminal confirmation unit 120 confirms a terminal located at a boundary between two or more sectors, for example, a boundary between the sectors S1 and S2 as a candidate terminal.

More specifically, the base station apparatus 100 can receive the interference information from all the terminals connected in the cell coverage C1, for example, the terminals 1, 2, 3, 4, 5, 6, .

On the basis of the interference information returned from the terminals 1, 2, 3, 4, 5, 6, and 7, the candidate terminal confirmation unit 120 determines that the terminal with the strong interference is located at the boundary between the sectors S1 and S2 It is recognized that the terminal is a terminal, and this terminal can be confirmed as a candidate terminal.

For example, when the signal-to-interference-plus-noise ratio (SINR) included in the interference information is used, the SINR threshold for finding a terminal with severe interference is set in the candidate terminal confirmation unit 120 .

Accordingly, the candidate terminal checking unit 120 may determine that the terminal whose SINR is less than the SINR threshold is a terminal with a strong interference, that is, a sector with a strong interference, based on the SINR in the interference information returned from the terminals 1, 2, It can be recognized that the terminal is located at the boundary between the terminals S1 and S2.

1, the terminals 6 and 7 are located at the boundary between the sectors S1 and S2 of all the terminals 5, 6 and 7 of the sector S1 located in the sector S1, If the terminal 2 is located at the boundary between the sectors S1 and S2 among the entire terminals 1, 2, 3 and 4 of the located sector S2, the candidate terminal confirmation unit 120 determines whether the terminal S1 2, and 7 as the terminals located at the boundary between the terminals 2, 6, and 6, and can identify the terminals 2, 6, and 7 as candidate terminals.

The target terminal determination unit 130 determines whether the candidate terminal identified by the candidate terminal verification unit 120 is a terminal that has not performed resource allocation and simultaneous data transmission in the case of performing simultaneous data transmission through two sectors S1 and S2 Based on the resource allocation comparison result obtained by comparing the resource allocation in the case where the resource allocation is compared.

Hereinafter, a process of determining a target terminal will be described in detail.

Prior to description, the base station apparatus 100 of the present invention may further include a sector setting unit 150, as shown in FIG.

The sector setting unit 150 sets a sector having the largest traffic load among two or more sectors formed by two or more antenna units 110, that is, two sectors S1 and S2 according to the above- And the remaining sectors excluding the reference sector out of the two sectors S1 and S2 can be set as adjacent sectors.

As described above, in the vertical sectoring system, since the size of the inner sector S1 is smaller than the size of the outer sector S2, the number of terminals connected in the outer sector S2 compared to the inner sector S1 It is general that the traffic load of the outer sector S2 is large.

Therefore, in the sector setting unit 150, the sector S2 outside the two sectors S1 and S2 is set as the reference sector, and the remaining sectors except for the sector S1 are set as the adjacent sectors It will be common.

From this point of view, the case where the sector S2 is set as the reference sector and the sector S1 is set as the adjacent sector will be described.

The sector setting unit 150 may be configured to reduce the interference between the at least two antenna units 110 and the at least two sectors S1 and S2 formed at different vertical tilting angles Each antenna variable can be set.

That is, the sector setting unit 150 can set an optimal antenna variable corresponding to a different vertical tilting angle for each of the two or more antenna units 110.

The candidate terminal determiner 130 determines candidate terminals of the reference sector located in the reference sector among the candidate terminals checked by the candidate terminal determiner 120, And determines it as a terminal.

For example, if the candidate terminal check unit 120 confirms the terminals 2, 6, and 7 to the candidate terminals, the target terminal determination unit 130 determines the target sectors S2, It is possible to determine the candidate terminal 2 of the reference sector S2 located in the target sector 2 as the target terminal.

On the other hand, the target terminal determination unit 130 determines at least some candidate terminals as target candidates based on the resource allocation comparison result, with respect to the candidate terminals of neighboring sectors located in the adjacent sectors among the candidate terminals checked by the candidate terminal verification unit 120 And determines it as a terminal.

For example, if the candidate terminal check unit 120 confirms the terminals 2, 6, and 7 as candidate terminals as described above, the target terminal determination unit 130 determines whether the candidate terminals 2, It is possible to determine at least some candidate terminals as candidate terminals based on the above-described resource allocation comparison result.

A process of determining the candidate terminals 6 and 7 of the adjacent sector S1 as target terminals will be described below.

The target terminal determination unit 130 performs the simultaneous data transmission using the number of candidate terminals in the adjacent sector S1, the number of candidate terminals in the reference sector S2, and the total number of terminals in the reference sector S2 The total resource amount to be allocated to the candidate terminal in the reference sector S2 is calculated.

For example, as described above, if the terminals 2, 6, and 7 are identified as candidate terminals in the environment shown in FIG. 1, the target terminal determination unit 130 determines whether the candidate terminals 6, The number of candidate terminals 2 of the reference sector S2 and the total number of terminals 1, 2, 3, and 4 of the reference sector S2, 6, and 7, the total resource amount to be allocated to the candidate terminals 2, 6, and 7 in the reference sector S2 is calculated when the simultaneous data transmission is performed through the two sectors S1 and S2 .

More specifically, the total resource amount Rcomp to be allocated to the candidate terminals 2, 6 and 7 in the reference sector S2 can be calculated according to the following equation (1).

Equation 1.

Here, Rcomp denotes a total resource amount to be allocated to a candidate terminal (target terminal) in the reference sector when all the candidate terminals are regarded as a target terminal.

Ninner, comp, Nouter, and comp in Equation 1 represent the number of candidate terminals of the adjacent sector S1 and the number of candidate terminals of the reference sector S2, and Nouter represents the total number of terminals of the reference sector S2 do.

Equation (1) means that the expected value (probability) of resources that can be allocated to each terminal including both the entire terminal of the reference sector S2 and the candidate terminal of the adjacent sector S1 is obtained, The sum of the number of candidate terminals in the adjacent sector S1 and the sum of the number of candidate terminals in the adjacent sector S1 is calculated to calculate the total resource amount Rcomp that can be allocated to all candidate terminals (target terminals) in the reference sector S2.

Therefore, if the terminals 2, 6, and 7 are identified as candidate terminals in the environment shown in FIG. 1, the target terminal determination unit 130 determines whether the candidate terminals 6, The number of candidate terminals 2 of the reference sector S2 and the total number of terminals 1, 2, 3 and 4 of the reference sector S2 are used to transmit data simultaneously The total resource amount (Rcomp = 0.5) to be allocated to the candidate terminals 2, 6 and 7 in the reference sector S2 can be calculated.

Then, the target terminal determination unit 130 uses the total resource amount Rcomp calculated in accordance with the above-described equation 1, the number of candidate terminals in the adjacent sector S1, and the total number of terminals in the adjacent sector S1, A first resource to be allocated to all the terminals of the adjacent sector S1 in the neighboring sector S1 when the simultaneous transmission is not performed and a second resource to be allocated to the neighboring sector S1 in the neighboring sector S1, And calculates a second resource to be allocated to each of the terminals except the candidate terminal of the neighboring sector S1 among all the terminals.

For example, as described above, if the terminals 2, 6, and 7 are confirmed as candidate terminals in the environment as shown in FIG. 1, the target terminal determination unit 130 determines that the calculated total resource amount (Rcomp = 0.5 Confirmed by the candidate terminal verification unit 120 using the candidate terminals 6 and 7 of the adjacent sector S1 and the total number of terminals 5,6 and 7 of the adjacent sector S1, 2, 6 and 7 are not simultaneously transmitted through the two sectors S1 and S2, the adjacent sectors S1 to S1 are allocated to all the terminals 5, 6 and 7 of the adjacent sector S1, 1 Calculate the resource.

Then, the target terminal determination unit 130 determines whether or not the calculated total resource amount Rcomp = 0.5, the number of candidate terminals 6 and 7 of the adjacent sector S1, 6 and 7 confirmed by the candidate terminal confirmation unit 120 using the seven numbers (3), the neighboring sector (S1) and the neighboring sector (S1) The second resource to be allocated to the terminal 5 excluding the candidate terminals 6 and 7 of the adjacent sectors S1 among all the terminals 5, 6 and 7 of the adjacent sector S1.

More specifically, the first resource and the second resource may be calculated according to the following Equation (2), and the sizes may be compared with each other.

Equation 2.

That is, the right side of Equation 2 corresponds to the first resource, and the left side of Equation 2 corresponds to the second resource.

Therefore, if the terminals 2, 6, and 7 are identified as candidate terminals in the environment as shown in FIG. 1, the target terminal determination unit 130 determines that the terminal 5, 6 and 7, if the simultaneous data transmission is not performed, 0.333 is allocated as the first resource to be allocated to all terminals 5, 6, and 7 of the adjacent sector S1 in the adjacent sector S1 Can be calculated.

The target terminal determination unit 130 determines whether or not the calculated total resource amount Rcomp = 0.5, the number of candidate terminals 6 and 7 of the adjacent sector S1, (7) and (7), the candidate terminals 6 and 7 of the adjacent sectors S1 of the adjacent sectors S1 to As a second resource to be allocated to the terminal 5, 0.5 can be calculated.

In this manner, when the first resource and the second resource are calculated, the target terminal determination unit 130 can determine all the candidate terminals of the adjacent sector S1 as target terminals when the calculated first resource is larger than the second resource have.

As described above, since the first resource (0.333) currently calculated is not larger than the second resource (0.5), i.e., the condition of Equation (2) is not satisfied, the target terminal determination unit (130) All the candidate terminals 6 and 7 of the sector S1 can not be determined as the target terminals.

Therefore, when the calculated first resource (0.333) is not larger than the second resource (0.5), i.e., the condition of Equation (2) is not satisfied, the target terminal determination unit (130) It is preferable that the maximum number of candidate terminals in the adjacent sector S1 is determined and only a part of candidate terminals corresponding to the maximum number of candidate terminals in the adjacent sector S1 determined in the candidate terminals in the adjacent sector S1 is determined as the target terminals.

More specifically, the target terminal determination unit 130 subtracts the number of candidate terminals in the adjacent sector by the specified number (X), and then subtracts the number of candidate terminals in the adjacent sector by the specified number (X) 1 resource and the second resource to determine whether or not the recalculated first resource is larger than the recalculated second resource, that is, whether or not the condition of Equation (2) is satisfied.

For example, in the above-described initial process of determining the candidate terminals 6 and 7 of the adjacent sector S1 as the target terminals, the target terminal determination unit 130 sets the specific number X to 0, 0.333) and the second resource (0.5).

Then, since the calculated first resource (0.333) is not larger than the second resource (0.5), i.e., the condition of Equation (2) is not satisfied, the target terminal determination unit (130) And the number of candidate terminals 1 of the adjacent sector S1 that is subtracted by a specified number (X = 1) after subtracting the number of candidate terminals 2 of the adjacent sector S1 by a specified number (X = 1) To recalculate the first resource and the second resource.

As a result, the target terminal determination unit 130 calculates the total resource amount (Rcomp = 0.4) in accordance with Equation 1 using the number of candidate terminals 1 of the adjacent sector S1 subtracted by the specified number (X = And recalculates the first resource (0.333) and the second resource (0.3) according to Equation (2).

As can be seen from the foregoing description, since the re-computed first resource (0.333) is larger than the recalculated second resource (0.3), i.e., the condition of Equation (2) is satisfied, the target terminal determination unit (130) S1) of the candidate terminals 6, 7 by subtracting a predetermined number (X = 1) that satisfies the condition of the expression (2) from the candidate terminals 6, 7 as the target terminals.

As a result, the maximum number of candidate terminals of the adjacent sector S1 that can satisfy the condition of Equation (2) is equal to the number of candidate terminals 6,7 of the adjacent sector S1 by a specified number (X = 1) And it is a boundary condition for maintaining the fairness of the terminal yield between the sectors S1 and S2 through the traffic distribution.

On the other hand, if the recalculated first resource is still not larger than the second resource recalculated and the condition of Equation 2 is not satisfied, the target terminal determination unit 130 increases the specific number X by +1 more, And recalculates the first resource and the second resource in the same manner as the first resource and the second resource.

Here, among the candidate terminals 6 and 7 of the adjacent sector S1, some candidate terminals obtained by subtracting a specific number (X = 1) that satisfies the condition of Equation 2 from the candidate terminals 6 and 7 of the adjacent sector S1, (X = 1) candidate terminals sequentially selected in order of increasing interference from the candidate terminal having the smallest interference.

That is, when the SINR of the candidate terminal is smaller than the SINR of the candidate terminal 7, that is, when the candidate terminal 7 is smaller in interference by the sector S2 than the candidate terminal 6, interference among the candidate terminals 6, 7 of the adjacent sector S1 The smallest candidate terminal would be candidate terminal 7. In this case, the target terminal determination unit 130 determines whether or not the candidates of the specific number (X = 1) sequentially selected in order of increasing interference from the candidate terminals with the smallest interference among the candidate terminals 6,7 of the adjacent sector S1 The candidate terminal 6 subtracting the terminal, that is, one candidate terminal 7, can be determined as the target terminal.

The scheduling unit 140 schedules the target terminal determined by the target terminal determination unit 130 to simultaneously transmit data in two or more sectors S1 and S2.

More specifically, the scheduling unit 140 performs scheduling for the reference sector S2 among the reference sector S2 and the neighboring sector S1, and performs scheduling for the reference sector S2 based on the scheduling information of the reference sector S2 And performs scheduling for the sector Sl.

That is, the scheduling unit 140 allocates resources to all the UEs and the target UEs of the reference sector S2 in the reference sector S2 to schedule data transmission.

The scheduling unit 140 allocates the same resource allocated by the reference sector S2 to each of the target terminals in the adjacent sector S1 and schedules the data to be simultaneously transmitted to the reference sector S2, The scheduling unit allocates the remaining resources except for the resources allocated to the target terminals by the reference sector S2 to transmit the data to all the remaining terminals except for the target terminal.

For example, referring to FIG. 4, if the terminals 2 and 6 are determined to be the target terminals, the scheduling unit 140 sets all terminals 1, 2, 3 and 4 of the reference sector S2 in the reference sector S2 And the target terminal 6 (except for the target terminal 2 belonging to all the terminals of the reference sector S2), a resource or an RB (Resource Block) is allocated and the data is scheduled to be transmitted.

The scheduling unit 140 then allocates the same resources allocated to the target sectors S2 to the target terminals 2 and 6 in the adjacent sector S1 based on the scheduling information of the reference sector S2, And transmits a resource allocated to each of the target sectors by the reference sector S2 to each of the remaining terminals 5 and 7 excluding the target terminal 6 among the entire terminals 5, 6 and 7 of the adjacent sector S1. And allocates remaining resources to transmit data.

4, in the reference sector S2, a reference sector S2 located at the boundary between the terminals 1, 3 and 4 and the sectors S1 and S2 located in the inner region of the reference sector S2 The terminal 2 of the reference sector S 2 located at the boundary between the sectors S 1 and S 2 and the adjacent sector S 1 of the adjacent sector S 1 The same resource as the reference sector S2 is allocated to each of the terminals 6 of the adjacent sectors S1 and S1 and the remaining resources are allocated to each of the terminals 5 and 7 located in the inner region of the adjacent sector S1.

As described above, the base station apparatus 100 according to the present invention is configured such that, in an environment in which two or more sectors (for example, S1 and S2) are separated and operated vertically adjacent to each other according to the application of the vertical sectoring system, (E.g., S1, S2) by performing simultaneous transmission of data by allocating identical resources simultaneously in two or more sectors (e.g., S1, S2) (Eg, terminals 2 and 6) to improve the SINR so that interferences between sectors (eg, S1 and S2) can be effectively resolved.

In addition, the base station apparatus 100 according to the present invention is capable of performing data concurrent transmission in a sector (e.g., S1 and S2) having a large traffic load among two or more sectors (e.g., S1 and S2) The candidate sector of the reference sector S2 having a large traffic load is subjected to simultaneous transmission of data and the adjacent sector S1 having a small traffic load is used as the target of simultaneous data transmission. Only the number of candidate terminals capable of maintaining the fairness of the terminal yield between the sectors S1 and S2 through the traffic distribution is targeted for simultaneous data transmission so that the fairness of the terminal yield between the sectors S1 and S2 is also effectively .

4, resources are allocated to the mobile stations in the sectors S1 and S2 using a round robin scheduling scheme, but this is only an example. In the present invention, any scheduling scheme other than round robin scheduling may be used .

As described above, the base station apparatus according to the present invention effectively solves interference between sector boundaries in an environment where two or more sectors are separated by antennas, throughput of the system can be achieved.

The present invention is not limited to the base station apparatus to which the vertical sectoring system is applied, and can be applied to any communication system environment in which two or more sectors are formed adjacent to each other.

Hereinafter, an operation method of the base station apparatus according to the preferred embodiment of the present invention will be described in detail with reference to FIG.

For convenience of explanation, the above-described FIG. 1, FIG. 2 and FIG. 4 will be described.

The operation method of the base station apparatus 100 according to the present invention is an operation method of vertically sectorizing a cell coverage (for example, cell coverage C1) divided into two or more sectors vertically adjacent to each other by two or more antenna units having different vertical tilt angles, System (S100).

Hereinafter, for the sake of convenience of description, the case of separating and operating the two sectors S1 and S2 as shown in FIG. 1 will be described.

In this case, the method of operating the base station 100 according to the present invention sets a sector with the largest traffic load among the two sectors S1 and S2 as a reference sector, Is set as a neighboring sector (S110).

As described above, in the vertical sectoring system, since the size of the inner sector S1 is smaller than the size of the outer sector S2, the number of terminals connected in the outer sector S2 compared to the inner sector S1 It is general that the traffic load of the outer sector S2 is large.

Therefore, in the method of operating the base station 100 according to the present invention, the sector S2 outside the two sectors S1 and S2 is set as a reference sector, and the remaining sectors except the sector S1, It is common to set it to the adjacent sector.

From this point of view, the case where the sector S2 is set as the reference sector and the sector S1 is set as the adjacent sector will be described.

Meanwhile, in the operation method of the base station apparatus 100 according to the present invention, a terminal located at the boundary between the sectors S1 and S2 is confirmed as a candidate terminal (S120).

More specifically, the method of operation of the base station apparatus 100 according to the present invention can be applied to all terminals connected in the cell coverage C1, such as terminals 1, 2, 3, 4, 5, The interference information can be returned.

The operation method of the base station apparatus 100 according to the present invention is a method of operating the sectors S1 and S2 with high interference based on the interference information returned from the terminals 1, 2, 3, 4, And recognizes the terminal as a candidate terminal.

1, the terminals 6 and 7 are located at the boundary between the sectors S1 and S2 of all the terminals 5, 6 and 7 of the sector S1 located in the sector S1, If the terminal 2 is located at the boundary between the sectors S1 and S2 among the entire terminals 1, 2, 3 and 4 of the located sector S2, the operation method of the base station 100 according to the present invention is a method It is possible to recognize the terminals 2, 6, and 7 as terminals located at the boundary between the terminals, that is, the sectors S1 and S2, and thus the terminals 2, 6 and 7 can be identified as candidate terminals.

Thereafter, the method of operating the base station 100 according to the present invention performs resource allocation and simultaneous data transmission in the case of simultaneous transmission of data through two sectors S1 and S2 to the candidate terminal identified in step S120 Based on the resource allocation comparison result obtained by comparing the resource allocation in the case where the resource allocation is not performed, the candidate terminal determined at step S120 as at least some of the candidate terminals.

Hereinafter, a process of determining a target terminal will be described in detail.

First, the method of operation of the base station 100 according to the present invention determines all the candidate terminals 2 of the reference sectors S2 among the candidate terminals 2, 6, 7 identified in step S120 as the target terminals (S130).

On the other hand, the operation method of the base station apparatus 100 according to the present invention is based on the above-described resource allocation comparison result for the candidate terminals 6 and 7 of the adjacent sectors S1 among the candidate terminals 2, At least some candidate terminals are determined as target terminals.

More specifically, the method of operation of the base station apparatus 100 according to the present invention is characterized in that, in an initial process of determining a candidate terminal 6,7 of a neighboring sector S1 as a target terminal, 0.

The method of operation of the base station apparatus 100 according to the present invention is a method of operating the base station apparatus 100 using the number of candidate terminals in the adjacent sector S1, the number of candidate terminals in the reference sector S2, In the case of simultaneous data transmission, the total resource amount to be allocated to the candidate terminal in the reference sector S2 is calculated (S140).

For example, as described above, if the terminals 2, 6, and 7 are identified as candidate terminals in the environment shown in FIG. 1, the operation method of the base station apparatus 100 according to the present invention is a method in which the adjacent sectors S1, By using the number of candidate terminals 6 and 7 of the reference sector S2 and the number of candidate terminals 2 of the reference sector S2 and the total number of terminals 1,2,3 and 4 of the reference sector S2, In the case of simultaneous data transmission according to Equation 1, the total resource amount (Rcomp = 0.5) to be allocated to the candidate terminals 2, 6 and 7 in the reference sector S2 can be calculated.

Thereafter, the method of operation of the base station apparatus 100 according to the present invention calculates the total resource amount Rcomp calculated according to Equation 1, the number of candidate terminals in the adjacent sector S1, the total number of terminals in the adjacent sector S1 A first resource to be allocated to all terminals of a neighboring sector S1 in a neighboring sector S1 when the data simultaneous transmission is not performed and a first resource to be allocated to all terminals of the neighboring sector S1 in a neighboring sector S1, A second resource to be allocated to each of the terminals except for the candidate terminal of the adjacent sector S1 among all terminals of the adjacent sector S1 is calculated S150.

For example, as described above, if the terminals 2, 6, and 7 are identified as candidate terminals in the environment as shown in FIG. 1, the operation method of the base station apparatus 100 according to the present invention is the same as the above- The number of candidate terminals 6 and 7 of the adjacent sector S1 and the total number of terminals 5,6 and 7 of the adjacent sector S1 are used in accordance with Equation 2 described above A first resource (0.333) to be allocated to all terminals 5, 6, and 7 of the adjacent sector S1 in the neighboring sector S1 when the simultaneous data transmission is not performed, The second resource 0.5 to be allocated to the terminal 5 excluding the candidate terminals 6 and 7 of the adjacent sectors S1 among the entire terminals 5, 6 and 7 of the adjacent sector S1 in the step S1).

If the first resource calculated in step S150 is larger than the second resource (Yes in S160), the method of operation of the base station apparatus 100 according to the present invention determines all the candidate terminals of the adjacent sector S1 as target terminals (S190). At this time, since the specific number X is 0, all the candidate terminals of the adjacent sector S1 can be determined as the target terminals.

However, since the currently calculated first resource (0.333) is not larger than the second resource (0.5), the base station apparatus (100) according to the present invention does not satisfy the condition of Equation (2) (S160 No), all the candidate terminals 6 and 7 of the adjacent sector S1 can not be determined as the target terminals.

If the calculated first resource (0.333) is not larger than the second resource (0.5) (S160 No), the base station apparatus 100 according to the present invention sets the specific number (X = 0) to +1 (S170), the number of candidate terminals (2) of the adjacent sector (S1) is subtracted by a specified number (X = 1) 1) to recalculate the first resource and the second resource (S140 to S150).

As a result, the method of operation of the base station apparatus 100 according to the present invention uses the number of candidate terminals 1 of the adjacent sector S1 subtracted by a specified number (X = 1) The first resource (0.333) and the second resource (0.3) will be recalculated in step S150 according to Equation (2) based on the resource amount (Rcomp = 0.4).

As can be seen from the foregoing description, the operation method of the base station apparatus 100 according to the present invention is such that the recalculated first resource (0.333) is larger than the recalculated second resource (0.3) (S160), it is possible to determine, as the target terminal, some candidate terminals obtained by subtracting a predetermined number (X = 1) from the candidate terminals 6 and 7 of the adjacent sector S1 so as to satisfy the condition of Equation (2).

Here, among the candidate terminals 6 and 7 of the adjacent sector S1, some candidate terminals obtained by subtracting a specific number (X = 1) that satisfies the condition of Equation 2 from the candidate terminals 6 and 7 of the adjacent sector S1, (X = 1) candidate terminals sequentially selected in order of increasing interference from the candidate terminal having the smallest interference.

That is, when the SINR of the candidate terminal is smaller than the SINR of the candidate terminal 7, that is, when the candidate terminal 7 is smaller in interference by the sector S2 than the candidate terminal 6, interference among the candidate terminals 6, 7 of the adjacent sector S1 The smallest candidate terminal would be candidate terminal 7. In this case, the method of operation of the base station apparatus 100 according to the present invention is a method of operating the candidate terminals 6,7 of the neighboring sector S1 by sequentially selecting a specific number X = 1), that is, the candidate terminal 6 subtracting one candidate terminal 7, as the target terminal.

Accordingly, the operation method of the base station apparatus 100 according to the present invention can determine the candidate terminals 2, 6 among the candidate terminals 2, 6, 7 as the target terminals.

The method of operation of the base station 100 according to the present invention further includes scheduling of the reference sector S2 among the reference sector S2 and adjacent sector S1 at step S200, And performs scheduling on the adjacent sector S1 based on the scheduling information (S210).

More specifically, the method of operation of the base station apparatus 100 according to the present invention is a method of operating all the terminals 1, 2, 3, 4 and the target terminal 6 (the target terminal 2 of the reference sector S2 in the reference sector S2) (Resource block) is allocated to each of the base stations (excluding the entire terminal of the reference sector S2) and scheduled to transmit data (S200).

The operation method of the base station apparatus 100 according to the present invention is the same as that of the first embodiment in which the reference sector S2 is allocated to each of the target terminals 2 and 6 in the adjacent sector S1 on the basis of the scheduling information of the reference sector S2 And the reference sector S2 is allocated to each of the remaining terminals 5 and 7 excluding the target terminal 6 among the entire terminals 5, 6 and 7 of the adjacent sector S1 Allocates remaining resources excluding the resource allocated to each of the target terminals, and schedules the data to be transmitted (S210).

4, in the reference sector S2, a reference sector S2 located at the boundary between the terminals 1, 3 and 4 and the sectors S1 and S2 located in the inner region of the reference sector S2 The terminal 2 of the reference sector S 2 located at the boundary between the sectors S 1 and S 2 and the adjacent sector S 1 of the adjacent sector S 1 The same resource as the reference sector S2 is allocated to each of the terminals 6 of the adjacent sectors S1 and S1 and the remaining resources are allocated to each of the terminals 5 and 7 located in the inner region of the adjacent sector S1.

INDUSTRIAL APPLICABILITY As described above, the method of operating the base station apparatus according to the present invention is advantageous in that, in an environment of forming two or more sectors separated by antennas, not only the effect of resolving interference between sectors, And the effect of increasing the fairness of the throughput of the terminal can all be achieved.

The method of operating the base station according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media 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 machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to the operation method of the base station apparatus and the base station apparatus according to the present invention, not only the effect of resolving the interference between the sectors in an environment of forming two or more sectors separated by the antennas, As it is possible to increase the fairness of throughput, it is possible to overcome the limitations of the existing technology, so that it is possible not only to use the related technology, This is an invention that is industrially applicable.

100: base station device
110: 2 or more antenna unit 120: candidate terminal confirmation unit
130: target terminal determination unit 140: scheduling unit
150: sector setting section

Claims (8)

Two or more antenna units forming two or more sectors adjacent to each other;
A candidate terminal confirmation unit for confirming a terminal located at a boundary between the at least two sectors as a candidate terminal;
Based on a result of the resource allocation comparison in which resource allocation in the case of simultaneous transmission of data through the two or more sectors to the candidate terminal and resource allocation in the case of not performing simultaneous data transmission are compared, A target terminal determination unit for determining a candidate terminal as a target terminal; And
And a scheduling unit for scheduling the target terminal to simultaneously transmit data in each of the two or more sectors. The method according to claim 1,
The two or more antenna units are two antenna units having mutually different vertical tilting angles,
Wherein the at least two sectors are an outer sector and an inner sector formed adjacent to each other in the vertical direction by the two antenna portions. The method according to claim 1,
Further comprising a sector setting unit setting a sector having the largest traffic load among the two or more sectors as a reference sector and setting a remaining sector excluding the reference sector as a neighboring sector among the two or more sectors. The method of claim 3,
Wherein the target-
All the candidate terminals of the reference sector located in the reference sector among the candidate terminals are determined to be the target terminals,
And determines at least some candidate terminals as candidate terminals based on the resource allocation comparison result for candidate terminals of neighboring sectors located in the neighboring sector among the candidate terminals. 5. The method of claim 4,
Wherein the target-
Calculating a total amount of resources to be allocated to the candidate terminal in the reference sector when performing the data concurrent transmission using the number of candidate terminals in the adjacent sector, the number of candidate terminals in the reference sector, and the total number of terminals in the reference sector and,
If simultaneous data transmission is not performed using the total amount of resources to be allocated to the candidate terminal, the number of candidate terminals in the adjacent sector, and the total number of terminals in the adjacent sector, And a second resource to be allocated to each of the terminals except for the candidate terminal of the adjacent sector among all terminals of the adjacent sector in the adjacent sector when performing the data concurrent transmission,
And determines all of the candidate terminals of the adjacent sector as the target terminal when the first resource is larger than the second resource. 6. The method of claim 5,
Wherein the target-
A first resource and a second resource using a number of candidate terminals of a neighboring sector that is subtracted by a specified number from the number of candidate terminals of the neighboring sector and subtracted by the specified number when the first resource is smaller than the second resource, Recalculate,
And determines a candidate terminal subtracting the predetermined number from the candidate terminals of the adjacent sector as the target terminal when the recalculated first resource is larger than the recalculated second resource. Forming two or more mutually adjacent sectors in two or more antenna portions with mutually different vertical tilting angles;
A candidate terminal identification step of identifying a terminal located at a boundary between the at least two sectors as a candidate terminal;
Based on a result of the resource allocation comparison in which resource allocation in the case of simultaneous transmission of data through the two or more sectors to the candidate terminal and resource allocation in the case of not performing simultaneous data transmission are compared, Determining a candidate terminal as a target terminal; And
And scheduling to simultaneously transmit data in each of the at least two sectors to the target terminal. 8. The method of claim 7,
Setting a sector having the largest traffic load among the two or more sectors as a reference sector and setting the remaining sectors of the two or more sectors as a neighboring sector except for the reference sector;
Wherein the target terminal determination step comprises:
Determining candidate terminals of a reference sector located in the reference sector among the candidate terminals,
And determining a candidate terminal of a neighboring sector located in the adjacent sector among the candidate terminals as a target terminal based on the resource allocation comparison result as a candidate terminal. Method of operation of the device.

Images