JP2015222929A - Communication control device, control method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine a connection destination cell of a terminal in a manner to increase the communication capacity of an overall system, while considering a communication capacity to be allocated to the terminal.SOLUTION: A communication control device determines which of a first base station device, which uses a first frequency band, and a second base station device, which uses a second frequency band, is to communicate with each of a plurality of terminals. The communication control device acquires information of a first communication capacity which each of the plurality of terminals requests, to calculate, for each of the plurality of terminals, a second communication capacity in a first cell and a third communication capacity in a second cell. Then, the communication control device determines, as a capacity to be achieved for each of the plurality of terminals, a smaller value between the first communication capacity and the second communication capacity for a terminal to be connected to a first base station device, and a smaller value between the first communication capacity and the third communication capacity for a terminal to be connected to a second base station device. Based on the total sum thereof, the communication control device determines a base station device of a connection destination.

Description

  The present invention relates to a technique for determining a base station apparatus to which a plurality of terminals are connected.

  In the third generation partnership project (3GPP), it is discussed to install a large number of small cells (small cells) that use different frequency bands within the coverage of a large cell (macro cell) (see Non-Patent Document 1). For example, as in the example of FIG. 1, a plurality of small cells using the 3.5 GHz band frequency band are placed in the coverage area of the macro cell using the 2 GHz band frequency band.

3GPP TR36.814 V9.0.0

  As shown in FIG. 1, when the macro cell and the small cell use different frequency bands, interference between these cells can be prevented, and the frequency utilization efficiency of the entire system can be improved. However, since the resources of each cell are limited, one or more terminals (UE) are appropriately determined in consideration of the UE's desire to be connected to which of the base station devices serving each cell. If it is not determined, the capacity of the entire system cannot be increased efficiently. For example, when there is a communication capacity that a certain UE desires, if this UE is ignored and this UE is accommodated in a cell that cannot satisfy the communication capacity, as a result, the communication capacity allocated to the UE becomes It may be wasted. In addition, even if an excessive communication capacity is allocated to a communication capacity desired by a certain UE, as a result, the UE uses only a necessary amount of communication capacity. It may be wasted.

  The present invention has been made in view of the above problems, and provides a technology for determining a connection destination cell of a terminal so as to increase the communication capacity of the entire system while considering the communication capacity to be allocated to the terminal.

  To achieve the above object, the communication control apparatus according to the present invention is arranged so that the first cell using the first frequency band and the second cell using the second frequency band have overlapping coverage areas. In each of the cell configurations, each of the plurality of terminals is any base station device with respect to the first base station device serving the first cell and the second base station device serving the second cell. A communication control device that determines whether to communicate with each other, the acquisition means for acquiring information on the first communication capacity requested by each of the plurality of terminals, and each of the plurality of terminals, Calculation means for calculating the second communication capacity in the first cell and the third communication capacity in the second cell, and the terminal connected to the first base station apparatus, the first communication capacity And the second communication capacity The smaller value of the first communication capacity and the third communication capacity of the terminal connected to the second base station apparatus is achieved for each of the plurality of terminals. When each of the plurality of terminals is based on the sum of the achieved capacities, the first base station apparatus and the second base station apparatus Determining means for determining whether to perform communication between each other.

  According to the present invention, it is possible to determine a connection destination cell of a terminal so as to increase the communication capacity of the entire system while considering the communication capacity to be allocated to the terminal.

The conceptual diagram which shows the example of arrangement | positioning of the macro cell and small cell which each use a different frequency band. The block diagram which shows the function structural example of a communication control apparatus. The block diagram which shows the hardware structural example of a communication control apparatus. The figure which shows the simulation result of the system capacity | capacitance when not having performed the process which concerns on embodiment.

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

(System configuration)
In the wireless communication system according to the present embodiment, the first cell (macro cell) using the first frequency band and the second cell (small cell, pico cell) using the second frequency band overlap with each other. The cell configuration is arranged as described above. For example, as illustrated in FIG. 1, each base station apparatus serving each cell is arranged so that a coverage area of a plurality of small cells is included in the coverage area of the macro cell. Further, a frequency band of 2 GHz is used in the macro cell, and a frequency band of 3.5 GHz or 60 GHz is used in the small cell. Although not shown in FIG. 1, there are a plurality of terminals in each coverage area, and communication is established by establishing a connection with either a macro station or a base station device that develops a small cell. Also, although only one macro cell is shown in FIG. 1, it is clear that there can be a plurality of macro cells.

  Hereinafter, a communication control apparatus that determines which base station apparatus each of a plurality of terminals communicates with in the above-described wireless communication system will be described. The communication control device may be included in, for example, a base station device that deploys a macro cell and a small cell, and a network node connected on the network side, or may be included in the base station device. Further, the communication control apparatus may be arranged in a BBU (BaseBand Unit) to which an RRH (Remote Radio Head) that performs processing of a radio frequency part such as an antenna that deploys each cell is connected, or at the same position as the BBU. . Note that the BBU is a device that commonly executes processing of baseband portions of a plurality of RRHs (base station devices) to be connected. In the following, although the arrangement of the communication control apparatus is not particularly limited, each base station apparatus and terminal perform control so as to establish a connection with the base station apparatus in which the terminal has been determined in accordance with an instruction from the communication control apparatus.

(Configuration of communication control device)
FIG. 2 shows a functional configuration example of the communication control apparatus. As illustrated in FIG. 2, the communication control apparatus includes, for example, a terminal desired capacity acquisition unit 201, a link capacity calculation unit 202, a connection destination determination unit 203, and a communication unit 204. The communication control apparatus can also include a determination process execution determination unit 205.

  The terminal desired capacity acquisition unit 201 acquires, for each of a plurality of terminals, a communication capacity requested (considered) by each terminal. The terminal desired capacity acquisition unit 201 acquires information indicating the communication capacity that is explicitly requested from a plurality of terminals via each base station device, for example. Note that the terminal desired capacity acquisition unit 201 may estimate the communication capacity requested by each terminal based on the amount of data to be transmitted to each terminal (for example, the amount of data stored in the buffer). In addition, the terminal desired capacity acquisition unit 201 may estimate the communication capacity requested by each terminal based on an application (such as a call, web browsing, or other application involving communication) executed by each terminal. .

・・・（１）
によって与えられる。ここで、Λ_i,jはチャネル行列から算出する固有値を要素とする対角行列であり、ｇ_i,jはパスゲイン、Ｎはｍｉｎ(Ｍ_t，Ｍ_r)で定まるＭＩＭＯ多重数、ｎ_iはセル間干渉である。また、η_B及びη_Sは修正シャノン容量の係数をそれぞれ示し、Ｉ_NはＮ次元の単位行列である。また、Ｅ{・}は期待値を表す。なお、各セルにおいてセル間干渉を低減するために、アンテナを用いて特定の指向性パターンで信号の送信を行う場合がある。この場合は、その指向性パターンによる影響を考慮して上述のリンク容量が算出される。なお、このリンク容量を計算するためのチャネルの状態などの各情報は、例えば通信部２０４を介して取得される。 Link capacity calculation section 202 calculates the link capacity obtained when each of a plurality of terminals is connected to each base station apparatus that deploys a macro cell or a small cell. The link capacity mentioned here is a communication capacity (for example, bps / Hz) with respect to a unit bandwidth. The link capacity is, for example, for cell (i) and UE (j)

... (1)
Given by. Here, Λ _{i, j} is a diagonal matrix whose elements are eigenvalues calculated from the channel matrix, g _{i, j} is the path gain, N is the MIMO multiplexing number determined by min (M _t , M _r ), and n _i is Inter-cell interference. Further, η _B and η _S indicate coefficients of the modified Shannon capacity, respectively, and I _N is an N-dimensional unit matrix. E {·} represents an expected value. In addition, in order to reduce inter-cell interference in each cell, a signal may be transmitted with a specific directivity pattern using an antenna. In this case, the above-described link capacity is calculated in consideration of the influence of the directivity pattern. Each information such as a channel state for calculating the link capacity is acquired via the communication unit 204, for example.

  The connection destination determination unit 203 connects each terminal to each base station obtained based on the communication capacity requested by each terminal acquired by the terminal desired capacity acquisition unit 201 and the link capacity calculated by the link capacity calculation unit 202. The connection destination of each terminal is determined based on the communication capacity obtained in this case. For example, the connection destination determination unit 203 achieves each terminal as a capacity that can be achieved by the smaller of the communication capacity requested by each terminal and the communication capacity obtained when each terminal is connected to each base station. Based on the sum of the capacities to be used, the connection destination base station apparatus of each terminal is determined. Here, this sum is the sum when it is assumed that each terminal is connected to any of the base station devices to which each terminal can be connected, and only for the base station device that is actually connected when determining the connection destination. Note that it is not considered. And the base station apparatus of the connection destination of each terminal is determined so that the sum total becomes the maximum or becomes a predetermined value or more. Details of the processing of the connection destination determination unit 203 will be described later.

  For example, the communication unit 204 is connected to each base station apparatus, transmits information on the connection destination of each terminal determined by the connection destination determination unit 203, and receives and acquires information for connection destination determination. The information on the connection destination of each terminal notified to each base station apparatus is sent to the terminal in the form of a control message for handing over from each base station apparatus to the determined connection destination base station apparatus, for example. Be notified. When the communication control device is included in the base station device, the communication unit 204 performs, for example, communication with another base station device and wireless communication with a terminal as the base station device. Can be configured as follows. Further, when the communication control device is arranged inside the BBU, the communication unit 204 performs radio communication with the terminal as a base station device through the RRH, and in some cases, between the BBUs corresponding to adjacent areas. It can be configured to communicate. That is, the communication unit 204 acquires information for determining the connection destination of the terminal, although the communication partner may vary depending on the position where the communication control device is arranged, etc. It is configured to be able to communicate information of the connection destination.

  The determination process execution determination unit 205 determines whether or not to perform connection destination determination processing for a plurality of terminals. For example, in the wireless communication system, the determination processing execution determination unit 205 is connected to a connection destination when a new base station device is added (when the power is turned on) or when the base station device is removed. It is determined that the determination process is executed. In addition, the determination process execution determination unit 205 may determine whether to perform the connection destination determination process based on, for example, the usage rate of radio resources (frequency resources) in each cell. In this case, for example, the variance of the usage rate of the radio resource in each cell is calculated, and the connection destination determination process is performed when the variance exceeds a predetermined size. That is, the usage rate of radio resources is biased from cell to cell, but if the bias is larger than a predetermined size, an excessive number of terminals are accommodated in some cells and a small number in other cells. Only terminals are considered to be accommodated. Therefore, in such a case, it is considered that base station apparatuses to which terminals are connected can be appropriately distributed by performing connection destination determination processing.

  The communication control apparatus as described above can be realized with a hardware configuration as shown in FIG. 3, for example. For example, the communication control device has a hardware configuration as shown in FIG. 3, and includes, for example, a CPU 301, a ROM 302, a RAM 303, an external storage device 304, and a communication device 305. In the communication control device, for example, a program that realizes each function of the communication control device, which is recorded in any of the ROM 302, the RAM 303, and the external storage device 304, is executed by the CPU 301. And a communication control apparatus controls the communication apparatus 305, for example by CPU301, and performs communication between a base station apparatus and another network node. Note that the communication control device may include dedicated hardware for executing each function, or may execute other portions by a computer that executes a part of the hardware and operates the program. Further, all functions may be executed by a computer and a program.

(Destination determination process)
Next, an example of connection destination determination processing executed by the connection destination determination unit 203 will be described. First, the connection destination determination unit 203 selects a macro cell and a small cell that are connection destination candidates for each of a plurality of terminals. That is, one macro cell and one small cell are selected for one terminal. For example, on the basis of the calculation result of the link capacity calculation unit 202 described above, for each terminal, one of the macro cells that can be connected has the maximum communication capacity (link capacity) with respect to the unit bandwidth, and the small cell that can be connected similarly. The one with the largest link capacity is selected. After that, when each terminal is connected to either the selected macro cell or small cell, the requested communication capacity of each terminal and the bandwidth that can be allocated according to the number of users in each cell are multiplied by the link capacity. Calculate whether the sum of the communication capacities with the smaller value is the maximum. Note that the connection destination determination unit 203 may determine the connection destination of each terminal so that the total sum is equal to or greater than a predetermined value.

・・・（２）
となる。ここで、Ｗ_Mはマクロセルの、Ｗ_Pはスモールセルの、それぞれ使用可能な帯域幅（Ｈｚ）を示す。なお、Ｗ_Pは、各スモールセルで異なる周波数帯域を用いる場合は、ｉの変数であるＷ_Pi（１≦ｉ≦Ｎ_P）で置き換えられてもよい。Ｃ_M,uは、マクロセルについての上述のリンク容量（ｂｐｓ／Ｈｚ）であり、Ｃ_Pi,uは、ｉ番目のスモールセルについてのリンク容量である。また、|Ｕ_M|はマクロセルに収容される端末の数であり、|Ｕ_Pi|はｉ番目のスモールセルに収容される端末の数である。なお、Ｕ_Mはマクロセルに収容される端末の集合を示し、Ｕ_Piはｉ番目のスモールセルに収容される端末の集合を示す。そして、Ｌ_uは、ｕ番目の端末の要求通信容量（ｂｐｓ）である。 Here, the total communication capacity is

... (2)
It becomes. Here, W _M is the macro cell, W _P is small cell, respectively available bandwidth (Hz). Note that W _P may be replaced with W _Pi (1 ≦ i ≦ N _P ), which is a variable of i, when different frequency bands are used in each small cell. C _{M, u} is the above-mentioned link capacity (bps / Hz) for the macro cell, and C _{Pi, u} is the link capacity for the i-th small cell. | U _M | is the number of terminals accommodated in the macro cell, and | U _Pi | is the number of terminals accommodated in the i-th small cell. U _M represents a set of terminals accommodated in the macro cell, and U _Pi represents a set of terminals accommodated in the i-th small cell. L _u is the requested communication capacity (bps) of the u th terminal.

Here, W _M / | U _M | is obtained by dividing the bandwidth usable in a macro cell by the number of terminals accommodated in the macro cell, which corresponds to the bandwidth that can be allocated to each terminal. . Accordingly, the communication capacity that can be actually achieved in a macro cell for a certain terminal u is (W _M / | U _M |) × C _{M, u} . That is, in the first term on the right side of Equation (2), the smaller of the communication capacity that can actually be achieved and the required communication capacity is selectively added as the communication capacity that is achieved for the terminal accommodated in the macro cell. ing. That is, if the requested communication capacity is less than or equal to the actually achievable communication capacity, the requested communication capacity is achieved, while if the requested communication capacity is larger than the actually achievable communication capacity, the requested communication capacity is Only the capacity that cannot be achieved and can be allocated to the maximum is allocated. Note that the small cell, as the second term on the right side of formula (2), as if N _P number of small cells are present, for each cell, calculating the same and the macrocell is performed, the result is added The

The connection destination determination unit 203 selects the connection destination of each terminal u from the macro cell and the small cell so that S shown in the equation (2) is maximized. That is, the connection destination determination unit 203 determines whether each u belongs to the set U _M or U _Pi (1 ≦ i ≦ N _P ) so that the above-described S is maximized.

・・・（３）
のように近似する。ここで、Ｕ_Miは、ｉ番目のスモールセルのエリアに存在し、マクロセルに接続するユーザの集合である。例えば、接続先の候補として、ｉ番目のスモールセルが選択されたユーザで、マクロセルに収容されたユーザｕが、この集合に含まれる。 Here, how to determine the connection destination of each terminal will be described from a mathematical viewpoint. In order to solve the above equation (2) as a linear programming problem,

... (3)
It approximates as follows. Here, U _Mi is a set of users existing in the area of the i-th small cell and connected to the macro cell. For example, the user u who is the user who has selected the i-th small cell as the connection destination candidate and is accommodated in the macro cell is included in this set.

・・・（４）
のように変形することができる。ここで、Ｕは、ｉ番目のスモールセルのエリアに存在する端末の総数である。また、ｘ_uは、端末ｕがマクロセルに収容される場合は１、スモールセルに収容される場合は０となる変数である。ここで、Ｘ＝[ｘ₁、…、ｘ_U]^Tとし、ψ_Uを要素が全て１で、要素数がＵの列ベクトルとすると、Σ_u=1 ^Uｘ_u＝ψ_U ^TＸと表される。なお、上付きのＴは行列（ベクトル）の転置を表し、Ｘψ_U ^T＝ｋ（１≦ｋ≦Ｕ−１）とする。ここで、式（４）について、右辺の中括弧で括られた２つの項の和をｆ_u,kと表し、第３項をａ_u,kとして表すと、

・・・（５）
となる。 In equation (3), the sum S _i of communication capacities in each small cell area is

... (4)
It can be deformed as follows. Here, U is the total number of terminals existing in the i-th small cell area. Further, x _u is a variable that becomes 1 when the terminal u is accommodated in the macro cell and becomes 0 when it is accommodated in the small cell. Here, if X = [x ₁ ,..., X _U ] ^T and ψ _U is a column vector with all elements being 1 and the number of elements is U, then Σ _{u = 1} ^U x _u = ψ _U ^T X Is done. The superscript T represents transposition of a matrix (vector), and Xψ _U ^T = k (1 ≦ k ≦ U−1). Here, regarding the expression (4), if the sum of two terms enclosed in braces on the right side is expressed as f _{u, k} and the third term is expressed as a _{u, k} ,

... (5)
It becomes.

を満たしながら、

を最大化するベクトルＸ、すなわち、Ｘ＝arg max_X（max_kν_k）を求める線型計画問題として解くことができる。このとき、接続先決定部２０３は、ベクトルＸにおいて、要素ｘ_uが１であれば端末ｕはマクロセルに収容されるべきであり、要素ｘ_uが０であれば端末ｕはスモールセルに収容されるべきであることを決定する。 Therefore, the connection destination determination unit 203 solves this problem with a constraint condition.

While satisfying

Can be solved as a linear programming problem for obtaining a vector X that maximizes X, that is, X = arg max _X (max _k ν _k ). At this time, in the vector X, the connection destination determination unit 203 should accommodate the terminal u in the macro cell if the element x _u is 1, and if the element x _u is 0, the terminal u is accommodated in the small cell. Decide what should be done.

  The above formula is for the area related to the i-th small cell. For this reason, this determination process is similarly performed also about the area regarding each small cell.

  FIG. 4 shows a result of comparing the communication capacity of the entire system by simulation with and without performing the above-described processing. In this simulation, the use frequency band in the macro cell is 2 GHz, and the bandwidth is 10 MHz. The antenna height at this time was 25 m, and the transmission power was 46 dBm. In addition, the frequency band and bandwidth used in the small cell are 100 MHz bandwidth of 3 GHz band and 2 GHz bandwidth of 60 GHz band. The antenna height at this time was 10 m for the 3 GHz band, 3 m for the 60 GHz band, and the transmission power was 30 dBm and 10 dBm, respectively. Further, the average required communication capacity of the terminal is 4.8 Gbps, and the distribution follows the gamma distribution.

  In FIG. 4, the solid line indicates the system capacity when the connection destination determination processing according to the present embodiment is performed, and the broken line indicates the system capacity when each terminal is connected to the base station apparatus having the strongest reception power. In addition, the graph with each point indicated by a circle is a characteristic when the small cell uses the 3 GHz band, and the graph with each point indicated by a square is the characteristic when the small cell uses the 60 GHz band. is there. FIG. 4 shows that the communication capacity of the entire system is increased when the connection destination determination process according to the present embodiment is performed regardless of the frequency band used by the small cell.

  As described above, the connection destination determination process according to the present embodiment makes it possible to sufficiently increase the communication capacity of the entire system while considering the required communication capacity of each terminal.

Claims (18)

In a cell configuration in which a first cell using a first frequency band and a second cell using a second frequency band are arranged so as to have overlapping coverage areas, the first cell serving the first cell A base station apparatus and a second base station apparatus serving the second cell, a communication control apparatus that determines which base station apparatus each of the plurality of terminals communicates with. There,
Obtaining means for obtaining information on a first communication capacity requested by each of the plurality of terminals;
Calculating means for calculating a second communication capacity in the first cell and a third communication capacity in the second cell of each of the plurality of terminals;
For a terminal connected to the first base station apparatus, the smaller value of the first communication capacity and the second communication capacity is used. For a terminal connected to the second base station apparatus, the first value is used. Based on the sum of the achieved capacities when the smaller one of the first communication capacity and the third communication capacity is the capacity achieved for each of the plurality of terminals, Determining means for determining which of each of the terminals performs communication between the first base station apparatus and the second base station apparatus;
A communication control device comprising: The determining means communicates between the first base station apparatus and the second base station apparatus so that each of the plurality of terminals has the maximum sum. To decide,
The communication control apparatus according to claim 1. The determining means communicates between each of the plurality of terminals between the first base station apparatus and the second base station apparatus so that the sum is equal to or greater than a predetermined value. Decide what to do,
The communication control apparatus according to claim 1. The calculation means determines a bandwidth that can be used by the first base station apparatus as a communication capacity for a unit bandwidth between a terminal connected to the first base station apparatus and the first base station apparatus. The second communication capacity is calculated as a value obtained by multiplying the result of dividing by the number of terminals connected to the first base station device,
The communication control device according to any one of claims 1 to 3, wherein The calculating means calculates a bandwidth that can be used by the second base station apparatus as a communication capacity for a unit bandwidth between a terminal connected to the second base station apparatus and the second base station apparatus. The third communication capacity is calculated as a value obtained by multiplying the result of dividing by the number of terminals connected to the second base station device,
The communication control apparatus according to any one of claims 1 to 4, wherein the communication control apparatus includes: The first cell is a cell with a wide coverage area, and the plurality of the second cells are included in the first cell.
The communication control apparatus according to any one of claims 1 to 5, wherein the communication control apparatus includes: For each of the plurality of terminals, the calculating means includes the second base station device having a maximum communication capacity with respect to a unit bandwidth among the plurality of second base station devices. 3 communication capacity is calculated,
The communication control apparatus according to claim 6. When at least one of the plurality of terminals can be connected to the plurality of first base station apparatuses, the calculating unit is configured to calculate a unit bandwidth of the plurality of first base station apparatuses. Calculating the second communication capacity for one first base station apparatus having the maximum communication capacity;
The communication control apparatus according to claim 7. The acquisition unit acquires the first communication capacity based on an amount of data to be transmitted to at least one terminal of the plurality of terminals.
The communication control apparatus according to any one of claims 1 to 8, wherein the communication control apparatus includes: The acquisition means acquires the first communication capacity for at least one terminal of the plurality of terminals based on an application executed by the at least one terminal.
The communication control device according to any one of claims 1 to 9, wherein A determination unit configured to determine whether to perform the determination based on a usage rate of radio resources in the first cell and the second cell;
The communication control apparatus according to any one of claims 1 to 10, wherein the communication control apparatus includes: The determination means determines to make the determination when the usage rate deviation exceeds a predetermined size;
The communication control apparatus according to claim 11. A determination unit that determines to perform the determination in response to addition or removal of a base station apparatus that can be connected to at least one of the plurality of terminals;
The communication control apparatus according to any one of claims 1 to 10, wherein the communication control apparatus includes: The first base station apparatus and the second base station apparatus are apparatuses that perform processing of a radio frequency part, and perform baseband processing of the first base station apparatus and the second base station apparatus. Connected in common to a device including the communication control device,
The communication control apparatus according to claim 1, wherein The communication control device is included in either the first base station device or the second base station device.
The communication control apparatus according to claim 1, wherein   A network node comprising the communication control device according to claim 1. In a cell configuration in which a first cell using a first frequency band and a second cell using a second frequency band are arranged so as to have overlapping coverage areas, the first cell serving the first cell A communication control apparatus that determines which base station apparatus each of a plurality of terminals communicates with the second base station apparatus that provides the second cell and the second base station apparatus that provides the second cell A control method,
An obtaining step for obtaining information on a first communication capacity requested by each of the plurality of terminals;
A calculating step of calculating a second communication capacity in the first cell and a third communication capacity in the second cell for each of the plurality of terminals;
A terminal for determining a value of the smaller one of the first communication capacity and the second communication capacity for the terminal connected to the first base station apparatus to the second base station apparatus. Is based on the sum of the achieved capacities when the smaller one of the first communication capacity and the third communication capacity is the capacity achieved for each of the plurality of terminals. Determining each of the plurality of terminals to determine which of the first base station apparatus and the second base station apparatus to communicate with;
A control method characterized by comprising: In a cell configuration in which a first cell using a first frequency band and a second cell using a second frequency band are arranged so as to have overlapping coverage areas, the first cell serving the first cell A communication control apparatus that determines which base station apparatus each of a plurality of terminals communicates with a base station apparatus and a second base station apparatus that provides the second cell On the computer provided,
An acquisition step of acquiring information on a first communication capacity requested by each of the plurality of terminals;
A calculation step of calculating a second communication capacity in the first cell and a third communication capacity in the second cell of each of the plurality of terminals;
For a terminal connected to the first base station apparatus, the smaller value of the first communication capacity and the second communication capacity is used. For a terminal connected to the second base station apparatus, the first value is used. Based on the sum of the achieved capacities when the smaller one of the first communication capacity and the third communication capacity is the capacity achieved for each of the plurality of terminals, A determination step in which each of the terminals determines which of the first base station apparatus and the second base station apparatus communicates;
A program for running

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