JP6029892B2 - Radio terminal, radio base station selection method, and radio base station selection program - Google Patents

Radio terminal, radio base station selection method, and radio base station selection program Download PDF

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JP6029892B2
JP6029892B2 JP2012186396A JP2012186396A JP6029892B2 JP 6029892 B2 JP6029892 B2 JP 6029892B2 JP 2012186396 A JP2012186396 A JP 2012186396A JP 2012186396 A JP2012186396 A JP 2012186396A JP 6029892 B2 JP6029892 B2 JP 6029892B2
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radio
base station
terminal
wireless
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JP2014045331A (en
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義三 佐藤
義三 佐藤
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京セラ株式会社
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  The present invention relates to a radio terminal, a radio base station selection method, and a radio base station selection program.

Conventionally, a method for selecting a radio base station to be connected is known.
For example, in the wireless terminal disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-4262), the control unit (100) controls the wireless communication unit (10) so that only the received power level can be obtained for connectable base station devices. In addition, the system bandwidth and DL-MAP (Down Link Mapping message) are received, and the degree of congestion is obtained based on these, and the CQI (Channel Quality Indicator) is measured, based on these information. Then, the predicted rate when the connection is made is obtained, and this information is notified to the user.

JP 2011-4262 A

  However, since the wireless terminal described in Patent Document 1 selects a wireless base station based only on the degree of congestion, there is a problem that a wireless base station that necessarily increases the throughput is not always selected.

  For example, wireless base station # 1, wireless terminal A, and wireless terminal B are connected, wireless terminal A uses 10% of all wireless resources, and wireless terminal B uses 90% of all wireless resources. If the wireless terminal B has the wireless resource required by the wireless terminal A, the wireless terminal B is considered to be using the remaining wireless resource. In such a case, a newly connected wireless terminal can be predicted to be assigned at least half of the 90% wireless resources used by wireless terminal B (and thus 45% of all wireless resources). .

  On the other hand, when the wireless base station # 2 is connected to the wireless terminal C and the wireless terminal D, and the wireless terminals C and D use 50% of the total wireless resources, the wireless terminal C and the wireless terminal It is considered that the usage request level of the radio resource of D is approximately the same. In such a case, the radio resource amount is equally divided between the newly connected radio terminal, radio terminal C, and radio terminal D, and each radio terminal is assigned 1/3 of the total radio resources. Predictable.

  Therefore, a wireless terminal that newly starts communication can communicate with a higher transmission throughput when connected to the wireless base station # 1, but in Patent Document 1, only the degree of congestion is used as an index. Station # 1 cannot always be selected.

  Therefore, an object of the present invention is to provide a radio terminal, a radio base station selection method, and a radio base station selection program that can select a radio base station that maximizes transmission throughput.

  In order to solve the above-described problems, the present invention provides a candidate base station specifying unit that specifies a plurality of radio base stations that can be connected to a radio terminal in order to execute radio communication, and each radio base station that can be connected to the radio terminal A resource allocation amount predicting unit that predicts an allocation amount of radio resources in an equilibrium state to the terminal, and an equilibrium state of the terminal based on the predicted allocation of radio resources for each connectable radio base station Select the wireless base station that has the highest predicted transmission throughput among the connectable wireless base stations as the wireless base station to be connected to execute wireless communication A selection unit.

  Preferably, the resource allocation amount prediction unit predicts an allocation amount of radio resources in an equilibrium state to the terminal based on proportional fairness.

  Preferably, the resource allocation amount prediction unit calculates priorities of K wireless terminals connected to the wireless base station, and the wireless terminal connecting all the wireless resource amounts of the wireless base station and the own terminal ( When the priority of the equilibrium state when shared by K + 1) wireless terminals is calculated, and there is no wireless terminal having a priority equal to or higher than the priority of the equilibrium state among the priorities of the K wireless terminals The value obtained by dividing the total radio resource amount of the radio base station by (K + 1) is predicted as the radio resource allocation amount of the own terminal.

  Preferably, the resource allocation amount prediction unit has a priority equal to or higher than the priority in the equilibrium state when there is a wireless terminal having a priority equal to or higher than the priority in the equilibrium state among the priorities of the K wireless terminals. A sum of the radio resource amounts allocated to the radio terminals, and a value obtained by subtracting the total radio resource amount of the radio base station by the sum is set as the residual radio resource amount, and among the priorities of the K radio terminals, When there is no wireless terminal having a priority that is less than the priority in the equilibrium state, the remaining wireless resource amount is predicted as the wireless resource allocation amount of the own terminal.

  Preferably, the resource allocation amount prediction unit may determine the remaining radio resource amount of the radio base station when there are M radio terminals having a priority less than the priority in the equilibrium state among the priorities of the K radio terminals. Is calculated by the (M + 1) wireless terminals of the M wireless terminals and the own terminal, and the priority of the equilibrium state is calculated, and among the priorities of the M wireless terminals, When there is no radio terminal having a certain priority, a value obtained by dividing the remaining radio resource amount of the radio base station by (M + 1) is predicted as the radio resource allocation amount of the own terminal.

  Preferably, the resource allocation amount prediction unit has a priority equal to or higher than the priority in the equilibrium state when there is a wireless terminal having a priority that is equal to or higher than the priority in the equilibrium state among the priorities of the M wireless terminals. The sum of the radio resource amounts allocated to the radio terminals becomes a new residual radio resource amount obtained by subtracting the residual radio resource amount of the radio base station by the sum, and the priority of the M radio terminals is calculated. Among these, when there is no wireless terminal having a priority that is lower than the priority in the equilibrium state, a new residual wireless resource amount is predicted as a wireless resource allocation amount of the own terminal.

  Preferably, the throughput prediction unit predicts the MCS of the transmission signal when connected to each radio base station based on the reception power of the signal from each connectable radio base station, and the transmission rate determined by the predicted MCS Based on the predicted allocation amount of the radio resource, the transmission throughput in the equilibrium state of the own terminal is predicted.

  Preferably, the candidate base station specifying unit specifies a plurality of radio base stations transmitting a signal having a reception power equal to or higher than a predetermined value as connectable radio base stations.

  The present invention is a method of selecting a radio base station by a radio terminal, the step of identifying a plurality of connectable radio base stations, and for each connectable radio base station, radio resource in an equilibrium state to the own terminal A step of predicting an allocation amount, a step of predicting transmission throughput in an equilibrium state of the own terminal based on the predicted allocation amount of radio resources for each connectable radio base station, and a plurality of connectable radio bases Selecting a radio base station having the maximum predicted transmission throughput among the stations as a radio base station to be connected to execute radio communication.

  The radio base station selection program according to the present invention includes a step of identifying a plurality of connectable radio base stations to a computer of a radio terminal, and for each connectable radio base station, radio resource in an equilibrium state to the own terminal. A step of predicting an allocation amount, a step of predicting transmission throughput in an equilibrium state of the own terminal based on the predicted allocation amount of radio resources for each connectable radio base station, and a plurality of connectable radio bases The step of selecting a radio base station having the maximum predicted transmission throughput among the stations as a radio base station to be connected to perform radio communication is executed.

  According to the present invention, it is possible to select a radio base station that maximizes the transmission throughput.

It is a figure showing the structure of the radio | wireless terminal of embodiment of this invention. It is a flowchart showing the selection procedure of the radio base station by a radio | wireless terminal. It is a flowchart showing the detailed procedure of step S106 of FIG. (A) is a figure for demonstrating an example of allocation of the radio | wireless resource to the radio | wireless terminal connected to a certain base station. (B) is a figure for demonstrating the prediction of the allocation amount of a radio | wireless resource when the own terminal is newly connected from the state of (a). (A) is a figure for demonstrating another example of allocation of the radio | wireless resource to the radio | wireless terminal connected to a certain base station. (B) is a figure for demonstrating the prediction of the allocation amount of a radio | wireless resource when the own terminal is newly connected from the state of (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Constitution)
FIG. 1 is a diagram showing a configuration of a wireless terminal according to an embodiment of the present invention.

  The wireless terminal 1 includes an antenna 2, a wireless communication unit 3, a received power measurement unit 4, and a communication control unit 5. The communication control unit 5 includes a candidate base station identification unit 6, a resource information acquisition unit 7, a resource allocation amount prediction unit 8, a transmission throughput prediction unit 9, and a base station selection unit 10. The wireless terminal 1 is configured by a computer, and each component in the wireless terminal 1 is realized by the CPU of the computer executing a program. The program is recorded on a computer hard disk or an external recording medium (DVD (Digital Versatile Disc), CD-ROM (Compact Disc Read Only Memory), etc.), and is loaded into the computer memory at the time of execution.

  The wireless terminal 1 corresponds to various communication methods, for example, LTE (Long Term Evolution) method, CDMA (Code Division Multiple Access) method, WiMAX (Worldwide Interoperability for Microwave Access), WiFi method (wireless fidelity) communication, etc. Communication with a wireless base station of the system is possible.

  The radio communication unit 3 transmits a signal to the radio base station using radio resources allocated based on proportional fairness in the radio base station. In addition, the wireless communication unit 3 encodes and modulates a transmission signal according to MCS (Modulation and Coding Scheme) instructed from the wireless base station.

The received power measuring unit 4 measures the received power of the signal from the radio base station.
Candidate base station specifying unit 6 specifies a plurality of radio base stations transmitting signals having received power equal to or higher than a predetermined value as candidate base stations.

  The resource information acquisition unit 7 acquires the total radio resource amount V of the candidate base station and information (including information necessary for calculation of priority below) that identifies the radio terminal communicating with the candidate base station.

  The resource allocation amount prediction unit 8 predicts the allocation amount of radio resources in an equilibrium state to the terminal based on proportional fairness which is a radio resource allocation method in the radio base station.

  In the distribution of radio resources by proportional fairness, a radio terminal having higher communication quality and lower past average communication speed is given higher priority, and more radio resources are allocated.

  Specifically, if the estimated value of the instantaneous throughput of the wireless terminal i at time t is R (i) and the past average throughput of the wireless terminal i at time t is T (i), the priority P at time t (I) is represented by the following equation.

P (i) = R (i) / T (i) (1)
Here, R (i) is an amount determined by the modulation method.

  When the priority P (i) is high, more radio resources are allocated. As a result, the average throughput T (i) increases and thereby the priority P (i) decreases. On the other hand, when the priority P (i) is low, fewer radio resources are allocated. As a result, the average throughput T (i) decreases, thereby increasing the priority P (i). Accordingly, in an equilibrium state in which a predetermined time has elapsed since radio resources are allocated, all radio terminals communicating with one radio base station have the same priority.

  In order to predict the radio resource amount when the own terminal newly connects to the base station, the priority when the radio resource amount is shared equally is calculated by the following equation.

Ps = R (i) / TT (i) (2)
TT (i) is the past average throughput of the wireless terminal i when all wireless terminals connected to the wireless base station use the wireless resource equally.

  When the total number of wireless terminals connected to the radio base station is K, the resource allocation amount prediction unit 8 determines that the resource allocation amount prediction unit 8 is connected to the radio base station according to Equation (1). The priority of the wireless terminal is calculated. Also, the resource allocation amount prediction unit 8 expresses the priority Ps in the equilibrium state when the wireless terminal connected to all the wireless resource amounts of the wireless base station and the (K + 1) wireless terminals of the own terminal are shared ( Calculate according to 2). The resource allocation amount prediction unit 8 determines the total radio resource amount of the radio base station when there is no radio terminal having a priority that is equal to or higher than the priority Ps in the equilibrium state among the priorities of the K radio terminals ( The value divided by K + 1) is predicted as the radio resource allocation amount of the terminal itself.

  When there is a wireless terminal having a priority that is equal to or higher than the priority Ps in the balanced state among the priorities of the K wireless terminals, the resource allocation prediction unit 8 has a priority equal to or higher than the priority Ps in the balanced state. A sum S of radio resource amounts allocated to one or more radio terminals is calculated, and a value (residual radio resource amount) obtained by subtracting the total radio resource amount of the radio base station by the above sum S (residual radio resource amount) can be allocated. Calculate as When there is no wireless terminal having a priority that is less than the priority Ps in the balanced state among the priorities of the K wireless terminals, the resource allocation amount prediction unit 8 is configured to allocate an allocatable radio resource amount (residual radio resource amount). ) As a radio resource allocation amount of the terminal itself.

  The resource allocation amount predicting unit 8 determines the amount of radio resources that can be allocated when there are M wireless terminals having a priority less than the equilibrium priority Ps among the priorities of the K wireless terminals. The priority Ps of the equilibrium state when (M + 1) wireless terminals of the wireless terminal and the own terminal are shared is calculated according to the equation (2). The resource allocation amount prediction unit 8 determines the radio resource amount that can be allocated to the radio base station when there is no radio terminal having a priority that is equal to or higher than the priority Ps in the equilibrium state among the priorities of the M radio terminals. The value divided by (M + 1) is predicted as the radio resource allocation amount of the terminal itself.

  When there is a wireless terminal having a priority that is equal to or higher than the priority Ps in the equilibrium state among the priorities of the M wireless terminals, the resource allocation prediction unit 8 has a priority equal to or higher than the priority Ps in the equilibrium state. A sum S of radio resource amounts allocated to one or more radio terminals is calculated, and a value obtained by subtracting the radio resource amount of the radio base station by the above sum S is calculated as a new allocatable radio resource amount (new Residual radio resource amount). The resource allocation amount prediction unit 8 determines a new allocatable radio resource amount of its own terminal when there is no radio terminal having a priority less than the priority in the equilibrium state among the priorities of the M radio terminals. Predicted as radio resource allocation.

  The transmission throughput prediction unit 9 predicts the MCS of the transmission signal when connected to each radio base station based on the received power of the signal from each radio base station that can be connected to the radio terminal 1, and is determined by the predicted MCS. Based on the transmission rate and the estimated amount of allocated radio resources, the transmission throughput in the equilibrium state of the terminal itself is predicted.

  The base station selection unit 10 sets a wireless base station that has the maximum predicted transmission throughput among a plurality of wireless base stations that can be connected to the wireless terminal 1 as a wireless base station to be connected to execute wireless communication. select.

(Operation)
FIG. 2 is a flowchart showing a procedure for selecting a radio base station by the radio terminal.

  First, the candidate base station specifying unit 6 specifies a plurality of radio base stations that are transmitting signals whose reception power is a predetermined value or more. The identified radio base stations are designated as radio base stations # 1 to #N (step S101).

Next, the selection variable n is set to 1 (step S102).
Radio base station #n is selected (step S103).

  The resource information acquisition unit 7 acquires the total radio resource amount V of the radio base station #n and information (including information necessary for calculating the priority) specifying the radio terminal communicating with the radio base station #n. . The identified wireless terminals are defined as wireless terminals # 1 to #K (step S104).

  Next, when the own terminal is connected to the radio base station #n, the resource allocation prediction unit 8 predicts the radio resource allocation in an equilibrium state with the own terminal (step S106).

  Next, the transmission throughput prediction unit 9 predicts the transmission throughput when the terminal itself is connected to the radio base station #n (step S107).

  If n = N is not satisfied (NO in step S108), n is incremented by 1 (step S109), and the process returns to step S103.

  When n = N (YES in step S108), the base station selection unit 10 connects a radio base station that maximizes the predicted transmission throughput to perform radio communication. And the wireless communication unit 3 is caused to perform communication processing for connecting to the selected wireless base station (step S110).

FIG. 3 is a flowchart showing the detailed procedure of step S106 in FIG.
First, the resource allocation amount prediction unit 8 sets the total radio resource amount V to the allocatable resource amount Q, and sets the radio terminals # 1 to #U to be studied to the radio terminals # 1 to #K (step S201). .

  Next, the resource allocation amount prediction unit 8 calculates priorities P (1) to P (U) of the wireless terminals # 1 to #U communicating with the wireless base station #i according to the equation (1) ( Step S202).

  Next, the resource allocation amount prediction unit 8 calculates the priority Ps when the allocatable resource amount Q is shared equally among (U + 1) people according to the equation (2) (step S203).

  If there is no i that satisfies P (i) ≧ Ps (NO in step S204), the resource allocation amount prediction unit 8 predicts Q / (U + 1) as the allocation amount of the radio resource to the terminal itself. (Step S205).

  When there is i such that P (i) ≧ Ps (YES in step S204), the resource allocation amount prediction unit 8 allocates the radio resource of the wireless terminal #i that satisfies P (i) ≧ Ps. Is calculated S (step S206).

  The resource allocation amount prediction unit 8 decreases the allocatable resource amount Q by S (step S207).

  Next, when there is no i that satisfies P (i) <Ps (NO in step S208), the resource allocation amount prediction unit 8 sets the allocatable resource amount Q as the radio resource allocation amount to the terminal itself. Prediction is made (step S209).

  Next, when there is i such that P (i) <Ps exists (YES in step S208), the resource allocation amount prediction unit 8 selects a wireless terminal that satisfies P (i) <Ps as a wireless to be examined. It resets to terminal # 1-#U (step S210), and returns to step S203.

(Example of radio resource allocation prediction)
Next, an example of radio resource allocation amount prediction according to the present embodiment will be described.

  FIG. 4A is a diagram for explaining an example of assignment of radio resources to radio terminals connected to a certain base station. FIG. 4B is a diagram for explaining prediction of the radio resource allocation amount when the own terminal is newly connected from the state of FIG.

  Wireless terminal # 1 to wireless terminal # 4 execute an application that receives a moving image stream. In the equilibrium state, the radio terminals # 1 to # 4 have the same priority and need as many radio resources as possible. Therefore, the radio resources are equally allocated by 25%.

  The own terminal also executes an application that receives a moving image stream. At the beginning of a new connection, a lot of radio resources are allocated to the own terminal, but in the equilibrium state, the radio terminals # 1 to # 4 have the same priority and need as many radio resources as possible. Therefore, 20% of radio resources are equally allocated. That is, in step S204 in the flowchart of FIG. 4, since there is no wireless terminal satisfying P (i) ≧ Ps, NO is selected, and the wireless resource obtained by dividing the total wireless resource amount V by 5 is wireless terminal # 1. ~ # 4 and assigned to own terminal.

  FIG. 5A is a diagram for explaining another example of assignment of radio resources to radio terminals connected to a certain base station. FIG. 5B is a diagram for explaining prediction of the radio resource allocation amount when the own terminal is newly connected from the state of FIG.

  The wireless terminals # 1 to # 3 execute an application that receives voice data by VoIP (Voice over Internet Protocol). The priority of the wireless terminals # 1 to # 3 is higher than that of the wireless terminal # 4, but the amount of data to be transmitted is small, and as a result, the allocation amount of the balanced wireless resources is small (10% each). The wireless terminal # 4 executes an application that receives a file by FTP (File Transfer Protocol). Although the priority of the wireless terminal # 4 is lower than that of the wireless terminals # 1 to # 3, since there are surplus available wireless resources, a large amount of wireless resources (70%) are allocated in an equilibrium state as a result. .

  As with the wireless terminal # 4, the own terminal also executes an application that receives a file by FTP. At the beginning of a new connection, a lot of radio resources (most of 70% allocated to the radio terminal # 4) are present in the own terminal as shown in FIG. In addition, the allocation amounts of radio resources of the radio terminal # 4 and the own terminal are 35% each.

  That is, in step S204 in the flowchart of FIG. 4, there is a wireless terminal satisfying P (i) ≧ Ps (wireless terminals # 1 to # 3), and YES is selected. In step S208, there is a wireless terminal satisfying P (i) <Ps (wireless terminal # 4), and YES is selected. Since there is no wireless terminal satisfying P (i) ≧ Ps in the second step S204, NO is selected, and the wireless resource obtained by dividing the allocable resource amount (70%) into two equal parts is the wireless terminal # 4. Assigned to own terminal.

  As described above, according to the present embodiment, a wireless terminal is connected to all candidate wireless base stations based on proportional fairness that is a wireless resource allocation method of the wireless base station. Predict the amount of radio resources allocated to Furthermore, the wireless terminal can select a wireless base station that maximizes the transmission throughput by predicting the transmission throughput based on the predicted amount.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 wireless terminal, 2 antenna, 3 wireless communication unit, 4 received power measurement unit, 5 communication control unit, 6 candidate base station identification unit, 7 resource information acquisition unit, 8 resource allocation amount prediction unit, 9 transmission throughput prediction unit, 10 Base station selector.

Claims (9)

  1. A candidate base station identification unit that identifies a plurality of radio base stations connectable to a radio terminal in order to perform radio communication;
    For each radio base station that can be connected to a radio terminal , based on proportional fairness, a resource allocation amount prediction unit that predicts an allocation amount of radio resources in an equilibrium state to the own terminal;
    For each connectable radio base station, based on the predicted allocation of radio resources, a throughput prediction unit that predicts transmission throughput in an equilibrium state of the terminal itself;
    A radio terminal comprising: a selection unit that selects a radio base station having the maximum predicted transmission throughput among a plurality of connectable radio base stations as a radio base station to be connected to perform radio communication.
  2. The resource allocation prediction unit
    Calculating priorities of K wireless terminals connected to the wireless base station;
    Calculate the priority of the equilibrium state when the amount of all radio resources of the radio base station is shared by the connected radio terminal and (K + 1) radio terminals of its own terminal,
    A value obtained by dividing the total radio resource amount of the radio base station by (K + 1) when there is no radio terminal having a priority that is equal to or higher than the priority in the equilibrium state among the priorities of the K radio terminals. The wireless terminal according to claim 1 , wherein the wireless terminal is predicted as a radio resource allocation amount of the terminal.
  3. The resource allocation prediction unit
    If there is a wireless terminal having a priority that is equal to or higher than the priority in the equilibrium state among the priorities of the K wireless terminals, the priority is assigned to the wireless terminal that is equal to or higher than the priority in the equilibrium state. Calculating the sum of the radio resource amounts, and subtracting the total radio resource amount of the radio base station by the sum as a residual radio resource amount,
    When there is no wireless terminal having a priority that is less than the priority in the equilibrium state among the priorities of the K wireless terminals, the remaining wireless resource amount is predicted as the wireless resource allocation amount of the own terminal The wireless terminal according to claim 2 .
  4. The resource allocation prediction unit
    When there are M wireless terminals having a priority less than the priority in the equilibrium state among the priorities of the K wireless terminals,
    Calculating the priority of the equilibrium state when the remaining radio resource amount of the radio base station is shared by (M + 1) radio terminals of the M radio terminals and the own terminal;
    A value obtained by dividing the remaining radio resource amount of the radio base station by (M + 1) when there is no radio terminal having a priority that is equal to or higher than the priority in the equilibrium state among the priorities of the M radio terminals. The wireless terminal according to claim 3 , wherein the wireless terminal is predicted as a radio resource allocation amount of the terminal itself.
  5. The resource allocation prediction unit
    If there is a wireless terminal having a priority that is equal to or higher than the priority in the equilibrium state among the priority levels of the M wireless terminals, the priority is assigned to the wireless terminal that is equal to or higher than the priority in the equilibrium state. Calculating the sum of the amount of radio resources that are present, and subtracting the residual radio resource amount of the radio base station by the sum as a new residual radio resource amount,
    When there is no wireless terminal having a priority that is less than the priority in the equilibrium state among the priorities of the M wireless terminals, the new residual wireless resource amount is set as the wireless resource allocation amount of the own terminal. The wireless terminal according to claim 4 , wherein prediction is performed.
  6.   The throughput prediction unit predicts MCS of a transmission signal when connected to each radio base station based on reception power of a signal from each connectable radio base station, and a transmission rate determined by the predicted MCS The wireless terminal according to claim 1, wherein transmission throughput in an equilibrium state of the terminal itself is predicted based on the predicted allocation amount of the wireless resource.
  7. The candidate base station specifying unit specifies a plurality of radio base stations that are transmitting signals whose reception power is a predetermined value or more, as the connectable radio base stations, according to any one of claims 1 to 6. The wireless terminal described.
  8. A wireless base station selection method by a wireless terminal,
    Identifying a plurality of connectable radio base stations;
    For each connectable radio base station , based on proportional fairness, predicting an allocation amount of radio resources in an equilibrium state to its own terminal;
    For each connectable radio base station, predicting transmission throughput in an equilibrium state of the own terminal based on the predicted allocation of radio resources;
    Selecting a radio base station having the maximum predicted transmission throughput among a plurality of connectable radio base stations as a radio base station to be connected to perform radio communication. Method.
  9. To the computer of the wireless terminal,
    Identifying a plurality of connectable radio base stations;
    For each connectable radio base station , based on proportional fairness, predicting an allocation amount of radio resources in an equilibrium state to its own terminal;
    For each connectable radio base station, predicting transmission throughput in an equilibrium state of the own terminal based on the predicted allocation of radio resources;
    A radio base for executing a step of selecting a radio base station having the maximum predicted transmission throughput as a radio base station to be connected to perform radio communication among a plurality of connectable radio base stations Station selection program.
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