JP6041312B2 - Control device, control method therefor, and program - Google Patents

Description

  The present invention relates to a technique for improving frequency use efficiency in wireless communication.

  In mobile communication, communication is usually performed by transmitting and receiving radio signals between a base station and a mobile terminal using a predetermined frequency band. Therefore, communication is possible when the mobile terminal can receive the radio wave transmitted by the base station and the base station can receive the radio wave transmitted by the mobile terminal. Here, radio waves are attenuated by the propagation distance and shielding objects, and considering that there is a physical or legal limit in the transmission power of signals from base stations and mobile terminals, the radiated signals can be received normally. There may be a geographical area where the received signal power drops to an inadequate power level. Similarly, there may be geographical areas where the radiated power is not normally received at the counterpart device.

JP 2011-142596 A

  In conventional mobile communication using a frequency band having a relatively low center frequency, many base stations are installed so that such a geographical area becomes as narrow as possible. However, in recent years when the demand for high-speed communication is increasing, it is necessary to use a frequency band having a relatively high center frequency, and the coverage area may be narrowed due to the attenuation characteristics and straightness of the radio waves ( Patent Document 1). As a result, in such a frequency band, an area where surface coverage is difficult occurs, and there is a problem that a sufficiently high frequency utilization efficiency cannot be obtained as the entire system.

  The present invention has been made in view of the above problems, and an object of the present invention is to substantially expand a coverage area in a frequency band having a high center frequency and improve frequency utilization efficiency.

  In order to achieve the above object, a control device according to the present invention includes a first mobile communication device that performs communication using a first frequency band, and at least one of the first frequency band and the second frequency band. In a wireless communication system including a second mobile communication device that performs communication using and a base station that performs communication using the second frequency band, the first mobile communication device and the second mobile communication And a control device for controlling communication of the base station, which are geographically distributed, and in the first frequency band, the signal is detected based on detection of received signal power or signal feature detection. Transmission of a signal using the first frequency band determined according to a geographical position of a plurality of detection means to be detected and a detection means that has not detected a signal among the plurality of detection means is permitted. In the first area When the first mobile communication device is included in the first area, the first mobile communication device is configured to determine whether the first mobile communication device is included, and when the position of the first mobile communication device is included in the first area. A signal is transmitted to the second mobile communication device in the second frequency band, and the second mobile communication device receives the signal received from the first mobile communication device in the second frequency band. Notification means for notifying the first mobile communication device and the second mobile communication device of an instruction indicating transfer to a station.

  In order to achieve the above object, another control device according to the present invention includes a first mobile communication device that performs communication using a first frequency band, the first frequency band, and the second frequency band. In a wireless communication system including a second mobile communication device that performs communication using at least one and a base station that performs communication using the second frequency band, the first mobile communication device, the first mobile communication device, 2 and a control device for controlling communication of the base station, which are geographically distributed and based on detection of received signal power or detection of signal characteristics in a first frequency band. A plurality of detection means for detecting the signal and a signal using the first frequency band determined according to a geographical position of the detection means that did not detect the signal among the plurality of detection means. First to allow transmission A determination means for determining whether the second mobile communication device is included in an area; and when the position of the second mobile communication device is included in the first area, the second mobile communication device A notification for notifying the second mobile communication device of an instruction indicating that a signal received from the base station in the second frequency band is transferred to the first mobile communication device in the first frequency band; Means.

  ADVANTAGE OF THE INVENTION According to this invention, the frequency utilization efficiency in radio | wireless communication can be improved.

The figure which shows the structural example of a radio | wireless communications system. The figure which shows the hardware structural example of a control apparatus. The figure which shows the function structural example of a control apparatus. Schematic which shows the concept of determination of a transmission permission area | region. The flowchart which shows the communication control of the downlink which a control apparatus performs. The flowchart which shows the communication control of the uplink performed by a control apparatus.

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

(System configuration)
FIG. 1 shows a configuration example of a wireless communication system according to this embodiment. In FIG. 1, the base station 151 transmits a signal to or receives a signal from the mobile communication device (hereinafter referred to as a terminal) 152 using the first frequency band. Similarly, the base station 101 transmits a signal to the terminal 102 or receives a signal from the terminal using the second frequency band. Here, it is assumed that the first frequency band is, for example, a frequency band of 3.5 GHz band, and the second frequency band is, for example, a frequency band of 2 GHz band.

  Here, the coverage area obtained by developing a plurality of base stations using the first frequency band and the coverage area obtained by developing a plurality of base stations using the second frequency band are independent from each other, Generally does not match. That is, for example, there is a region where communication is possible in the second frequency band but communication is not possible in the first frequency band. At this time, the coverage area of the first frequency band is more likely to be out of the communication range due to the greater attenuation of the radio wave and higher straightness of the radio wave than the coverage area of the second frequency band. . Here, the region outside the communication range is, for example, a region where a signal from the base station cannot be received with a power of a predetermined value or higher, or a signal transmitted from the terminal cannot be received with a power of a predetermined value or higher. is there.

  On the other hand, for example, in a region where radio waves from the base station do not reach, even if a terminal transmits radio waves, it does not reach the base station, that is, the transmission signal of the terminal does not interfere with the base station. Similarly, in a region where radio waves from other terminals do not reach, it is considered that the other terminals do not interfere. In such a region, it can be considered that the frequency band and time resources that radio waves do not reach are not used (that is, “free”). Therefore, a terminal in such a region can directly transmit and receive a signal to and from another terminal using at least one of a frequency band and a time resource used for communication with the base station. Conceivable.

  Thus, in the wireless communication system of the present embodiment, when the terminal 102 does not interfere with the base station 151 and the terminal 152 in the first frequency band, the signal transmission in the first frequency band is permitted. Then, the signal received from the base station 101 by the terminal 102 in the second frequency band is transferred to another terminal 103 using the first frequency band. Similarly, when the terminal 103 does not interfere with the base station 151 and the terminal 152 in the first frequency band, the terminal 103 is permitted to transmit signals to the terminal 102 using the first frequency band. In this case, when the terminal 102 receives a signal in the first frequency band, the terminal 102 transfers the signal to the base station 101 in the second frequency band.

  Here, these communications are controlled by the control device 110. The control device 110 is connected to a plurality of signal detectors 111 arranged geographically dispersed by, for example, a wired line or a wireless line (not shown). For example, each of the plurality of signal detectors 111 detects a signal in the first frequency band having a reception power equal to or higher than a predetermined value, and notifies the control device 110 of the detection result. The control device 110 is permitted to transmit a signal in the first frequency band based on the geographical position of the signal detector 111 that has not detected a signal in the first frequency band having a reception power equal to or greater than a predetermined value. Specify the transmission permission area. The plurality of signal detectors 111 detect whether or not a signal exists in the first frequency band as a result of feature detection based on characteristics of the signal in the first frequency band, such as a synchronization signal or a reference signal. The result may be notified to the control device 110. In this case, according to the detection result, the control device 110 determines the first frequency band based on the geographical position of the signal detector 111 that did not detect the signal by feature detection in the first frequency band. You may identify the transmission permission area | region where transmission of a signal is permitted. Details of specifying the transmission permission area will be described later.

  For example, when the terminal 102 exists in the transmission permission region, the control device 110 notifies the terminal 102 of an instruction to transfer a signal to the terminal 103 using the first frequency band. In addition, for example, when the terminal 103 exists in the transmission permission region, the control device 110 receives a signal transmission instruction to the terminal 102 using the first frequency band to the terminal 103 in the first frequency band. The transfer instruction to the base station 101 is notified to the terminal 102, respectively.

  By the operation as described above, for example, the terminal 103 can perform communication using the first frequency band even though the terminal 103 does not actually exist in the coverage area 150 of the first frequency band. As a result, the coverage area of the first frequency band is substantially expanded, and the frequency utilization efficiency of the entire system can be improved.

  Below, the structure and process of the control apparatus 110 which concern on this embodiment are demonstrated in detail.

(Configuration of control device)
FIG. 2 shows a hardware configuration example of the control device 110. As illustrated in FIG. 2, the control device 110 includes, for example, a CPU 201, a ROM 202, a RAM 203, an external storage device 204, and a communication device 205. In the control device 110, for example, the CPU 201 executes a program that realizes each function of the control device 110 shown below, which is recorded in any of the ROM 202, the RAM 203, and the external storage device 204. Then, the control device 110 uses the communication device 205 to collect information on detection results from the signal detector 111 or notify an instruction to a terminal or the like for performing communication control. In FIG. 2, the control device 110 has one communication device 205, but may have a plurality of communication devices such as a communication device for information collection and a communication device for instruction notification.

  Note that the control device 110 may include dedicated hardware that executes each function described below, or may execute a part of the hardware and execute the other part using a computer that runs the program. Good. Further, all the following functions may be executed by a computer and a program.

  FIG. 3 is a block diagram illustrating a functional configuration of the control device 110. The control device 110 includes, as functions, a signal detection information acquisition unit 301, a transmission permission area determination unit 302, a terminal location information acquisition unit 303, a relay determination unit 304, and an instruction notification unit 305. The control device 110 may include a relay device selection unit 306.

  The signal detection information acquisition unit 301 acquires, from the signal detector 111, information on a detection result as to whether a signal having a received power equal to or greater than a predetermined value has been detected. Note that the signal detector 111 passes the detection result of the detection method for detecting the characteristic portion included in the signal, such as a synchronization signal or a reference signal, and estimating the presence or intensity of the signal, to the signal detection information acquisition unit 301. May be. At this time, the signal detector 111 may detect not only the signal in the first frequency band but also the signal in the second frequency band. The signal detector 111 may have a function of determining whether the received signal is related to communication between the base station and the terminal or communication between terminals. In this case, even if a signal related to communication between terminals is detected, the signal detector 111 may determine that the signal is not detected if a signal related to communication between the base station and the terminal is not detected. .

  Further, the signal detector 111 is configured by an antenna, and the signal detection information acquisition unit 301 receives the received signal itself from the signal detector 111, and based on the received signal, the signal detection information acquisition unit 301 receives a received power equal to or higher than a predetermined value. It may be determined whether or not the signal is detected. Similarly, the signal detection information acquisition unit 301 may perform signal feature detection based on the received signal received from the signal detection unit and determine whether the signal is detected.

  Even if a signal is transmitted based on the signal detection result acquired by the signal detection information acquisition unit 301, the transmission permission region determination unit 302 determines a transmission permission region that does not interfere with other devices. Details of the determination method will be described later. The determination result is input to the relay determination unit 304.

  The terminal position information acquisition unit 303 acquires information on the position of a terminal that is a communication target. For example, the terminal position information acquisition unit 303 acquires position information of at least one of the terminal 102, the terminal 103, and the terminal 152 in FIG. Note that, for example, when communicating with a certain terminal, the terminal position information acquiring unit 303 may acquire only the position information of the terminal related to the communication with the terminal. That is, for example, in the communication with the terminal 103, since the terminal 102 is related to the communication between the base station 101 and the terminal 103, only the location information of the terminal 102 and the terminal 103 may be acquired. . Further, for example, when the relay device selection unit 306 selects a terminal capable of inter-terminal communication with the terminal 103 as a candidate for a relay device, in this case, all the position information of the candidate terminal of this relay device is acquired. You may make it do. The acquired position information is input to the relay determination unit 304.

  The relay determination unit 304 determines whether signal relay transmission is possible based on the positional relationship between the terminal position information and the transmission-permitted area. Specifically, in the downlink example of FIG. 1, the relay determination unit 304 determines whether the terminal 102 is located in the transmission permitted area in the first frequency band, and enters the transmission permitted area. It is determined that relay transmission can be permitted. Further, in the uplink example of FIG. 1, it is determined whether the terminal 103 is located in the transmission permitted area. If the terminal 103 is in the transmission permitted area, the signal using the first frequency band by the terminal 103 is determined. Transmission and transfer of a signal using the second frequency band by the terminal 102 are permitted. Note that the relay determination unit 304 relays only when it is determined that both uplink and downlink relay transmissions are possible, that is, only when both the terminal 102 and the terminal 103 exist in the transmission permitted area. You may determine to permit transmission. The result of the determination is input to the instruction notification unit 305.

  Note that the relay determination unit 304 may not permit relay transmission when the terminal 103 can communicate with the base station 101 using the second frequency band. In this case, the base station 101 can directly communicate with the terminal 103 by using the second frequency band without relay transmission. At this time, for example, when the signal detector 111 detects a signal from the base station 101 in the second frequency band, the relay determination unit 304 sets the terminal 103 in an area where the base station 101 develops according to the detection result. May be specified. Further, the relay determination unit 304 may directly inquire of the base station 101 whether the terminal 103 exists in the area. In this case, the relay determination unit 304 may acquire information on whether the terminal 103 can transmit and receive signals in the second frequency band from a database (not shown). If the terminal 103 cannot transmit / receive a signal in the second frequency band, whether or not the terminal 102 or the terminal 103 exists in the transmission permitted area, regardless of whether or not the terminal 103 exists in the area where the base station 101 develops. Whether or not relay transmission is possible is determined according to the above.

  In addition, when there are a plurality of terminals that can perform terminal-to-terminal communication with the terminal 103, that is, when there are a plurality of relay device candidates, the relay determination unit 304 determines whether or not relay transmission is permitted for each of these candidates. You may judge. And the relay determination part 304 may select one relay apparatus according to the determination result. For example, the relay determination unit 304 may select a candidate that is sufficiently close to the terminal 103 among the candidates that exist in the transmission-permitted area as a relay device. In addition, the relay determination unit 304 may select different relay apparatuses for uplink and downlink.

  The instruction notification unit 305 notifies an instruction indicating that a signal should be transmitted or transferred to at least one of a terminal serving as a relay device and a terminal serving as a destination of data transmitted by the base station 101. For example, this instruction is notified to the terminal 102 via the base station 101, and is notified to the terminal 103 by being transferred from the terminal 102. Alternatively, this instruction may be notified to each terminal via a wireless communication system having a sufficiently wide coverage area for control signals. The terminal that has received the instruction transmits a signal or transfers the received signal according to the content of the instruction.

  In the instruction, for example, in the downlink transmission of FIG. 1, a signal received in the second frequency band from the base station 101 to the terminal 102 is transferred to the terminal 103 using the first frequency band. Instructions are included. Further, for example, in the uplink transmission of FIG. 1, the transmission permission of the signal using the first frequency band to the terminal 103 and the second frequency of the signal received from the terminal 103 in the first frequency band to the terminal 102 are provided. A transfer instruction to the base station 101 using the band is included.

(Transmission permission area judgment method)
Next, a transmission permission area determination method will be described. First, as a premise, it is assumed that the signal detectors 111 are geographically distributed as shown in FIG. 4 and that the transmission permission area determination unit 302 knows the positional relationship between them. That is, for example, it is assumed that the transmission permission region determination unit 302 knows that the signal detector 111-1 exists at a position adjacent to the signal detectors 111-2 and 111-5.

  At this time, in FIG. 4, the signal detectors 111-4, 111-6 to 111-8, 111-10 to 111-12, and 111-14 to 111-16 detect a signal with a received power that is a predetermined value or more. Suppose you did not. On the other hand, it is assumed that the signal detectors 111-1 to 111-3, 111-5, 111-9, and 111-13 detect a signal having a reception power equal to or higher than a predetermined value. In the following, processing based on whether or not a signal having a reception power equal to or greater than a predetermined value has been detected will be described. However, feature detection such as whether or not a feature amount of a signal is detected at a level equal to or greater than a predetermined level. A similar process is executed even if it is a process based on whether or not a signal has been detected. In other words, the following description is valid even if the point that “a signal is received with a reception power of a predetermined value or more” is replaced with “a signal is detected by feature detection”.

  At this time, the transmission permission region determination unit 302 detects a signal having a reception power of a predetermined value or more in a signal detection unit in an adjacent position among signal detection units in which a signal of a reception power of a predetermined value or more is not detected. Extract what was done. That is, in the example of FIG. 4, signal detectors 111-4, 111-6 to 111-8, 111-10, and 111-14 are extracted.

  At this time, since these extracted signal detectors detect signals with a reception power of a predetermined value or more in adjacent signal detectors, regions where such signals are detected and regions where they are not detected It is thought that it is located near the boundary. Therefore, sending signals in the vicinity of these extracted signal detectors may unintentionally cause interference to other devices. For this reason, the transmission permission area | region determination part 302 determines the position away from these extracted signal detectors more than predetermined distance as an area | region which permits transmission of a signal, for example. At this time, the area extending in the direction of the signal detector that has detected the signal with the received power equal to or higher than the predetermined value is an area that does not permit signal transmission. In this way, for example, an area such as the area painted with the vertical line in FIG. 4 is determined as the transmission permitted area. That is, among signal detectors that did not detect a signal, a predetermined distance from the signal detector in the direction where the signal detector that detected the signal does not exist with reference to the signal detector adjacent to the signal detector that detected the signal. The area away from the above is determined as the transmission permitted area. As a result, a signal is not erroneously transmitted near the boundary between a region where a signal is detected and a region where a signal is not detected, and the probability of interference with other devices can be reduced.

  In the example of FIG. 4, among the signal detectors near the boundary between the region where the signal is detected and the region where the signal is not detected, a region that is more than a predetermined distance away from the signal detector on the side where the signal is not detected is defined as a transmission permission region. However, it is not limited to this. For example, if a signal detector that has not detected a signal in any of the adjacent signal detectors and the signal detector has also detected no signal, an area within a predetermined distance from the signal detector is set as a transmission permission area. Also good.

(Control device processing)
Subsequently, processing executed by the control device 110 will be described with reference to FIGS. 5 and 6. FIG. 5 is a flowchart showing the flow of communication control processing in downlink transmission (from the base station 101 to the terminal 103), and FIG. 6 shows communication control processing in uplink transmission (from the terminal 103 to the base station 101). It is a flowchart which shows the flow.

  In FIG. 5, first, the control device 110 identifies a signal detector that has not detected a signal (S501), and identifies a transmission-permitted area based on the geographical location of the signal detector (S502). The specific method of specifying the transmission permission area is as described above. Then, the control device 110 can transmit a terminal that relays data, that is, a terminal that can directly communicate with the base station in the second frequency band and can directly communicate with the data destination terminal in the first frequency band. It is determined whether it exists in (S503). When the relay terminal exists in the transmission permission area (YES in S504), the control device 110 transmits the first downlink data received from the base station in the second frequency band to the relay terminal. The transfer using the frequency band is instructed (S505). On the other hand, if the terminal that relays data does not exist in the transmission permission area (NO in S504), if that terminal actually performs the relay process, it will interfere with other devices, so relaying is permitted. The process is terminated without doing so.

  Note that the control device 110 may confirm whether or not the data destination terminal exists in the area where the base station is deployed before starting this processing. When the terminal exists in the area where the base station is deployed, it is not necessary to perform the relay process, and thus the control device 110 does not have to perform the process of FIG. As a result, unnecessary relay processing can be omitted, and opportunities for communication with other terminals that need to relay in the first frequency band can be increased, and the frequency utilization efficiency of the entire system can be improved. It becomes.

  In S503 and S504, if there are a plurality of relay terminal candidates, it is determined whether each candidate exists in the transmission permission area, and a terminal that actually performs relaying is selected from the candidates present in the transmission permission area. May be. As a result, it is possible to increase the probability that the relay can be permitted as compared to the case where only one terminal is determined as a relay terminal in advance and it is determined whether the terminal exists within the transmission permission region. Therefore, it is possible to secure more opportunities for transmitting data to the destination terminal.

  On the other hand, also in uplink communication control (FIG. 6), control device 110 first identifies a signal detector that has not detected a signal (S501), and transmits based on the geographical location of the signal detector. The permitted area is specified (S502). Subsequently, the control device 110 determines whether the terminal that is the data transmission source, not the relay terminal, exists in the transmission permission area (S601). When the data transmission source terminal exists in the transmission permission area (YES in S602), the control device 110 permits the transmission source terminal to transmit uplink data using the first frequency band. (S603). In this case, the control device instructs the relay terminal to perform relay using the second frequency band of the data received in the first frequency band. On the other hand, when the data transmission source terminal does not exist within the transmission permission area (NO in S602), if this terminal transmits a signal, there is a possibility that interference with other devices may occur. Therefore, in this case, the control device 110 does not allow the signal transmission and ends the process.

  As described above, the control device 110 according to the present embodiment confirms that the relay terminal or the data transmission source terminal exists in the transmittable area of the system using the first frequency band, and then transmits the data. Or instruct relay. Accordingly, it is possible to effectively use the first frequency band while avoiding interference with other devices using the first frequency band, and it is possible to improve the frequency use efficiency of the entire system. .

  In the above description, the control device 110 actively executes processing for determining whether or not the terminal 103 is allowed to communicate. However, the above processing is executed only when there is a communication request from the terminal 103. May be. That is, when there is a request for communication with the base station 101 from the terminal 103, the control device 110 executes the process shown in at least one of FIG. 5 and FIG. May be notified to at least one of the terminal 103 and the terminal 102. At this time, the request signal may be relayed to the base station 101, for example, by the terminal 102 and notified to the control device 110 from the base station 101. At this time, at least one of the first frequency band and the second frequency band may be used as the frequency band for transmitting the request at this time, or another frequency band may be used.

Claims (9)

A first mobile communication device that performs communication using a first frequency band; a second mobile communication device that performs communication using at least one of the first frequency band and the second frequency band; and In a wireless communication system including a base station that performs communication using a second frequency band, a control device that controls communication of the first mobile communication device, the second mobile communication device, and the base station There,
A plurality of detection means that are geographically distributed and detect the signal based on detection of received signal power or signal feature detection in the first frequency band;
The first region where transmission of the signal using the first frequency band is permitted, which is determined according to a geographical position of the detection unit that did not detect the signal among the plurality of detection units, Determining means for determining whether one mobile communication device is included;
When the position of the first mobile communication device is included in the first region, the first mobile communication device transmits a signal to the second mobile communication device in the first frequency band, and An instruction indicating that the second mobile communication device transfers a signal received from the first mobile communication device to the base station in the second frequency band, with the first mobile communication device. Notification means for notifying to the second mobile communication device;
A control device comprising: A first mobile communication device that performs communication using a first frequency band; a second mobile communication device that performs communication using at least one of the first frequency band and the second frequency band; and In a wireless communication system including a base station that performs communication using a second frequency band, a control device that controls communication of the first mobile communication device, the second mobile communication device, and the base station There,
A plurality of detection means that are geographically distributed and detect the signal based on detection of received signal power or signal feature detection in the first frequency band;
The first region where transmission of the signal using the first frequency band is permitted, which is determined according to a geographical position of the detection unit that did not detect the signal among the plurality of detection units, Determining means for determining whether two mobile communication devices are included;
When the position of the second mobile communication device is included in the first region, the second mobile communication device receives a signal received from the base station in the second frequency band in the first region. Notification means for notifying the second mobile communication device of an instruction indicating transfer to the first mobile communication device in a frequency band;
A control device comprising: The first region is a region that does not interfere with other communication devices that perform communication using the first frequency band when a signal is transmitted in the first frequency band.
The control device according to claim 1 or 2, wherein Selection means for selecting the second mobile communication device from among the mobile communication devices capable of communicating with the first mobile communication device in the first frequency band and communicating with the base station in the second frequency band. Further having
The control device according to claim 1, wherein the control device is a control device. The first mobile communication device further has a function of communicating in the second frequency band,
Further comprising specifying means for specifying whether the first mobile communication device exists in a second area where communication with the base station is possible;
The notification means notifies the instruction only when the first mobile communication device does not exist in the second area.
The control device according to claim 1, wherein the control device is a control device. A first mobile communication device that performs communication using a first frequency band; a second mobile communication device that performs communication using at least one of the first frequency band and the second frequency band; and In a wireless communication system including a base station that performs communication using the second frequency band, the terminals are geographically distributed, and in the first frequency band, detection of received signal power or detection of signal characteristics is performed. A control method for controlling the first mobile communication device, the second mobile communication device, and a control device for controlling communication of the base station, having a plurality of detection means for detecting the signal based on the first mobile communication device;
A first area where transmission of the signal using the first frequency band is permitted, wherein the determination means is determined according to a geographical position of the detection means that did not detect the signal among the plurality of detection means. A determination step of determining whether or not the first mobile communication device is included,
The notifying means sends a signal to the second mobile communication device in the first frequency band when the position of the first mobile communication device is included in the first region. An instruction indicating that the second mobile communication device transmits a signal received from the first mobile communication device to the base station in the second frequency band. A notification step of notifying the mobile communication device and the second mobile communication device;
A control method characterized by comprising: A first mobile communication device that performs communication using a first frequency band; a second mobile communication device that performs communication using at least one of the first frequency band and the second frequency band; and In a wireless communication system including a base station that performs communication using the second frequency band, the terminals are geographically distributed, and in the first frequency band, detection of received signal power or detection of signal characteristics is performed. A control method for controlling the first mobile communication device, the second mobile communication device, and a control device for controlling communication of the base station, having a plurality of detection means for detecting the signal based on the first mobile communication device;
A first area where transmission of the signal using the first frequency band is permitted, wherein the determination means is determined according to a geographical position of the detection means that did not detect the signal among the plurality of detection means. A determination step of determining whether or not the second mobile communication device is included,
When the notification means includes a position of the second mobile communication device included in the first area, the second mobile communication device receives a signal received from the base station in the second frequency band. A notification step of notifying the second mobile communication device of an instruction indicating transfer to the first mobile communication device in the first frequency band;
A control method characterized by comprising: A first mobile communication device that performs communication using a first frequency band; a second mobile communication device that performs communication using at least one of the first frequency band and the second frequency band; and In a wireless communication system including a base station that performs communication using the second frequency band, the terminals are geographically distributed, and in the first frequency band, detection of received signal power or detection of signal characteristics is performed. A computer having a plurality of detection means for detecting the signal based on the first mobile communication device, the second mobile communication device, and a control device for controlling communication of the base station,
The first region where transmission of the signal using the first frequency band is permitted, which is determined according to a geographical position of the detection unit that did not detect the signal among the plurality of detection units, A determination step of determining whether one mobile communication device is included;
When the position of the first mobile communication device is included in the first region, the first mobile communication device transmits a signal to the second mobile communication device in the first frequency band, and An instruction indicating that the second mobile communication device transfers a signal received from the first mobile communication device to the base station in the second frequency band, with the first mobile communication device. A notification step of notifying the second mobile communication device;
A program for running A first mobile communication device that performs communication using a first frequency band; a second mobile communication device that performs communication using at least one of the first frequency band and the second frequency band; and In a wireless communication system including a base station that performs communication using the second frequency band, the terminals are geographically distributed, and in the first frequency band, detection of received signal power or detection of signal characteristics is performed. A computer having a plurality of detection means for detecting the signal based on the first mobile communication device, the second mobile communication device, and a control device for controlling communication of the base station,
A first area where transmission of the signal using the first frequency band is permitted, wherein the determination means is determined according to a geographical position of the detection means that did not detect the signal among the plurality of detection means. A determination step of determining whether or not the second mobile communication device is included,
When the notification means includes a position of the second mobile communication device included in the first area, the second mobile communication device receives a signal received from the base station in the second frequency band. A notification step of notifying the second mobile communication device of an instruction indicating transfer to the first mobile communication device in the first frequency band;
A program for running

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