JP7031827B2 - Communication arbitration device, terminal device, program to be executed by a computer, computer-readable recording medium and data structure in which the program is recorded. - Google Patents

Description

The present invention relates to a communication arbitration device, a terminal device, a program to be executed by a computer, a computer-readable recording medium on which the program is recorded, and a data structure.

Further frequency resources are needed to meet the various communication performance requirements of 5th generation mobile communication systems. Among them, the technology of sharing frequencies that are not used at time and place is attracting attention (Non-Patent Document 1). In order to share the frequency, it is necessary to sequentially grasp the usage status of the primary user so as not to interfere with the existing wireless system (primary user). On the other hand, a system for estimating the usage status (power distribution) of a primary user using a mobile device as a sensor terminal has been proposed (Non-Patent Document 2).

Ministry of Internal Affairs and Communications, "Radio Policy 2020 Roundtable Report", June 2016. Matsuno et al., "Efforts for frequency sharing between different wireless systems in 5th generation mobile communication systems," Academic Techniques, RCS116, Oct.2016.

However, when the shared frequency is used in the 5th generation mobile communication system, if the shared frequency is used in the communication of emitting radio waves from the terminal device to the base station, the radio waves from the terminal device reach the range of the radio waves from the base station. It extends to the outside. Then, when the primary user exists outside the reach of the radio wave from the base station, the base station cannot recognize the primary user. As a result, there is a problem of causing interference to the primary user.

Therefore, according to the embodiment of the present invention, there is provided a communication arbitration device that arbitrates the communication conditions of the secondary user so as to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user. do.

Further, according to the embodiment of the present invention, in order to cause the computer to arbitrate the communication conditions of the secondary user so as to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user. Program is provided.

Further, according to the embodiment of the present invention, in order to cause the computer to arbitrate the communication conditions of the secondary user so as to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user. Provide a computer-readable recording medium on which the program of the present invention is recorded.

Further, according to the embodiment of the present invention, there is provided a terminal device that performs wireless communication so as to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

Further, according to the embodiment of the present invention, a data structure for arbitrating the communication conditions of the secondary user so as to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user is provided. offer.

(Structure 1)
According to an embodiment of the present invention, the communication arbitration device includes an estimation means, a determination means, a generation means, and a transmission means. The estimation means determines a first radio wave reachable range, which is a range of radio waves transmitted from a primary user based on a plurality of position information indicating the positions of a plurality of terminal devices and a plurality of received powers of the plurality of terminal devices. In addition to estimating, the second radio wave reachable range, which is the reachable range of the radio wave transmitted from the base station, is estimated based on the transmission power of the base station which is the secondary user. As a determining means, based on a plurality of transmission powers and a plurality of position information in the plurality of terminal devices, the range of the radio wave transmitted from the terminal device includes the position of the base station and is out of the range of the first radio wave or the first. A terminal transmission permission area is determined, which is an area within the radio wave reachable range of 2 and is an area in which the terminal device is permitted to transmit radio waves on a shared frequency shared by the primary user and the base station. The generation means generates communication conditions of a plurality of terminal devices that do not interfere with the primary user based on the terminal transmission permission area determined by the determination means. The transmission means transmits the communication conditions generated by the generation means to a plurality of terminal devices.

According to the configuration 1, the determination means determines the terminal transmission permission area, and the generation means generates communication conditions of a plurality of terminal devices that do not interfere with the primary user based on the terminal transmission permission area. Then, the transmission means transmits the communication condition to a plurality of terminal devices. As a result, the plurality of terminal devices perform wireless communication according to the communication conditions received from the communication arbitration device, so that the radio wave transmitted from the terminal device does not reach the first radio wave reach range.

Therefore, it is possible to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 2)
In the configuration 1, when the primary user is not detected, the determination means determines the terminal transmission permission area so that the reach of the radio wave transmitted from the terminal device is within the second radio wave reach range.

According to the configuration 2, the terminal transmission permission area is determined so that the reach of the radio wave transmitted from the terminal device is within the second radio wave reach range. As a result, even if the first radio wave reachable range exists near the second radio wave reachable range, the radio wave transmitted from the terminal device does not reach the first radio wave reachable range.

Therefore, it is possible to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 3)
In configuration 1, the determining means is transmitted from the terminal device when a primary user existing outside the reach of the second radio wave is detected, or when the radio wave transmitted from the base station interferes with the primary user. The terminal transmission permission area is determined so that the reach of the radio wave to be received is outside the reach of the first radio wave.

According to the configuration 3, the terminal transmission permission area is determined so that the reach of the radio wave transmitted from the terminal device is outside the reach of the first radio wave.

Therefore, it is possible to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 4)
In any of configurations 1 to 3, the determining means is a radio wave in a radio wave propagation model transmitted from the terminal device using the radio wave propagation loss calculated based on the transmission power of the base station and the reception power of the terminal device. The first propagation characteristic, which is the propagation characteristic of the radio wave, is acquired, and the second propagation characteristic, which is the propagation characteristic of the radio wave when the frequency in the acquired first propagation characteristic is set to the shared frequency, is acquired. The terminal transmission permission area is determined using the propagation characteristics of.

According to the configuration 4, the determination means determines the terminal transmission permission region using the propagation characteristics suitable for the propagation model of the radio wave when the terminal device performs wireless communication. As a result, the terminal transmission permission area is determined according to the environment in which the terminal device performs wireless communication.

Therefore, it is possible to accurately avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 5)
In the configuration 4, the determination means determines the transmission power of the terminal device used for determining the terminal transmission permission area as the transmission power of the terminal device in the terminal transmission permission area, and the generation means is the terminal device determined by the determination means. Generate communication conditions including transmission power.

According to the configuration 5, the radio wave transmitted from the terminal device does not reach within the first radio wave reach range because the terminal device transmits the radio wave with the transmission power included in the communication condition in the terminal transmission permission area.

Therefore, it is possible to reliably avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 6)
In configuration 5, when the radio wave transmitted by the terminal device with the determined transmission power does not reach the base station, the determining means stops the transmission of the radio wave from the terminal device, and the generating means stops the transmission of the radio wave. Generate communication conditions including the stop signal.

According to the configuration 6, the terminal device other than the terminal device for which the transmission of the radio wave is stopped can surely transmit and receive the radio wave to and from the base station in the terminal transmission permission area.

(Structure 7)
Further, according to the embodiment of the present invention, the terminal device includes a receiving means and a communication means. The receiving means receives communication conditions from the communication arbitration device according to any one of configurations 1 to 6. When the communication condition does not include the stop signal, the communication means transmits and / or receives radio waves to and / or to the base station and / or other terminal device at a shared frequency according to the communication permission content.

According to the configuration 7, the radio wave transmitted from the terminal device does not reach within the first radio wave reachable range.

Therefore, it is possible to reliably avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 8)
In configuration 7, the communication means stops the transmission of radio waves when the communication conditions include a stop signal.

According to the configuration 8, the terminal device other than the terminal device for which the transmission of the radio wave is stopped can surely transmit and receive the radio wave to and from the base station in the terminal transmission permission area.

(Structure 9)
Further, according to an embodiment of the present invention, the program is transmitted from a primary user by an estimation means based on a plurality of position information indicating the positions of a plurality of terminal devices and a plurality of received power waves in the plurality of terminal devices. The second radio wave reach, which is the reach of the radio wave transmitted from the base station, is estimated based on the transmission power of the base station, which is the secondary user, while estimating the first radio wave reach range, which is the reach of the radio wave. The reach of the radio wave transmitted from the terminal device includes the position of the base station based on the first step of estimating the range and the determination means based on the plurality of transmission powers and the plurality of position information in the plurality of terminal devices. At the same time, it is an area outside the first radio wave reach or within the second radio wave reach, and the terminal device is permitted to transmit radio waves at a shared frequency shared by the primary user and a plurality of terminal devices. The second step of determining the terminal transmission permission area, which is the area, within the second radio wave reach range, and the generation means interfere with the primary user based on the terminal transmission permission area determined in the second step. To cause the computer to perform a third step of generating communication conditions for a plurality of terminal devices and a fourth step in which the transmitting means transmits the communication conditions generated in the third step to the plurality of terminal devices. It is a program of.

According to the configuration 9, when the computer executes the program, the determining means determines the terminal transmission permission area, and the generation means is a plurality of terminal devices that do not interfere with the primary user based on the terminal transmission permission area. Generate communication conditions. Then, the transmission means transmits the communication condition to a plurality of terminal devices. As a result, the plurality of terminal devices perform wireless communication according to the communication conditions received from the communication arbitration device, so that the radio wave transmitted from the terminal device does not reach the first radio wave reach range.

Therefore, it is possible to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 10)
In the configuration 9, when the primary user is not detected in the second step, the determination means sets the terminal transmission permission area so that the reach of the radio wave transmitted from the terminal device is within the second radio wave reach range. decide.

According to the configuration 10, when the computer executes the program, the terminal transmission permission area is determined so that the reach of the radio wave transmitted from the terminal device is within the second radio wave reach range. As a result, even if the first radio wave reachable range exists near the second radio wave reachable range, the radio wave transmitted from the terminal device does not reach the first radio wave reachable range.

Therefore, it is possible to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 11)
In the configuration 9, the determining means determines in the second step when a primary user existing outside the reach of the second radio wave is detected, or the radio wave transmitted from the base station interferes with the primary user. In this case, the terminal transmission permission area is determined so that the reach of the radio wave transmitted from the terminal device is outside the first radio wave reach range.

According to the configuration 11, when the computer executes the program, the terminal transmission permission area is determined so that the reach of the radio wave transmitted from the terminal device is outside the first radio wave reach range.

Therefore, it is possible to avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 12)
In any of configurations 9 through 11, the determination means is transmitted from the terminal device using the radio wave propagation loss calculated based on the transmission power of the base station and the reception power of the terminal device in the second step. The first propagation characteristic, which is the propagation characteristic of the radio wave in the radio wave propagation model, is acquired, and the second propagation characteristic, which is the propagation characteristic of the radio wave when the frequency in the acquired first propagation characteristic is set to the shared frequency. Is acquired, and the terminal transmission permission area is determined using the second propagation characteristic.

According to the configuration 12, when the computer executes the program, the determining means determines the terminal transmission permission region using the propagation characteristics suitable for the propagation model of the radio wave when the terminal device performs wireless communication. As a result, the terminal transmission permission area is determined according to the environment in which the terminal device performs wireless communication.

Therefore, it is possible to accurately avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 13)
In the configuration 12, the determination means determines the transmission power of the terminal device used for determining the terminal transmission permission area as the transmission power of the terminal device in the terminal transmission permission area in the second step, and the generation means is the third. In the step, the communication condition is generated including the transmission power of the terminal device determined in the second step.

According to the configuration 13, the radio wave transmitted from the terminal device is the first, because the computer executes the program and the terminal device transmits the radio wave with the transmission power included in the communication condition in the terminal transmission permission area. It does not reach within the range of radio waves.

Therefore, it is possible to reliably avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 14)
In the configuration 13, when the radio wave transmitted by the terminal device with the determined transmission power does not reach the base station in the second step, the determination means stops the transmission of the radio wave from the terminal device, and the generation means: In the third step, a communication condition is generated including a stop signal for stopping the transmission of radio waves.

According to the configuration 14, when the computer executes the program, the terminal device other than the terminal device whose transmission of the radio wave is stopped can surely transmit and receive the radio wave to and from the base station in the terminal transmission permission area.

(Structure 15)
Further, according to an embodiment of the present invention, the program comprises a first step in which the receiving means receives communication conditions from the communication arbitration device according to any one of configurations 1 to 6, and the communication means communicates with the first step. A program for causing a computer to perform a second step of transmitting and / or receiving radio waves to and / or receiving radio waves with a base station and / or other terminal device at a shared frequency according to the communication permission content when the condition does not include a stop signal. ..

According to the configuration 15, the radio wave transmitted from the terminal device does not reach within the first radio wave reach range when the computer executes the program.

Therefore, it is possible to reliably avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 16)
In configuration 15, the communication means stops the transmission of radio waves in the second step when the communication condition includes a stop signal.

According to the configuration 16, when the computer executes the program, the terminal device other than the terminal device whose transmission of the radio wave is stopped can surely transmit and receive the radio wave to and from the base station in the terminal transmission permission area.

(Structure 17)
Further, according to an embodiment of the present invention, the recording medium is a computer-readable recording medium on which the program according to any one of configurations 9 to 16 is recorded.

(Structure 18)
Further, according to the embodiment of the present invention, the data structure includes the position information of the base station of the secondary user, the transmission antenna gain of the base station, the transmission power of the base station, and the position information of the terminal device. It is a data structure including the received power of the terminal device and the transmitted power of the terminal device, and the position information of the terminal device and the received power of the terminal device are used by the estimation means to estimate the position of the primary user. , The received power below the set value of the received power of the terminal device, and the position information indicating the position of the primary user are the first radio wave reachable range in which the estimation means is the range of the radio wave of the primary user. Used for estimation, the transmission power of the base station, the transmission antenna gain of the base station, and the reception power of the terminal device are used by the estimation means to estimate the second radio wave reach range, which is the range of the radio wave of the base station. The transmitted power of the terminal device and the received power used to estimate the second radio wave reach range are used by the determining means to determine the reach of the radio wave transmitted from the terminal device, and the terminal device is used. The position information and the position information of the base station are used for the determination means to obtain the first distance which is the distance between the base station and the terminal device, and the position information indicating the position of the primary user and the position of the base station are used. The information is used for the determination means to obtain the second distance, which is the distance between the primary user and the base station, and the first radio wave reach range, the second radio wave reach range, the radio wave reach range, and the first. The distance and the second distance are determined by means in a region where the range of the radio wave transmitted from the terminal device includes the position of the base station and is outside the range of the first radio wave or within the range of the second radio wave. The terminal transmission permission area is used to determine the terminal transmission permission area, which is an area in which the terminal device is permitted to transmit radio waves on a shared frequency shared by the primary user and the base station. The generation means is used to generate communication conditions for the terminal device that does not interfere with the primary user.

According to the configuration 18, the terminal transmission permission area can be determined using the data structure, and the communication condition of the terminal device that does not interfere with the primary user is generated based on the determined terminal transmission permission area.

Therefore, it is possible to reliably avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

(Structure 19)
Further, according to the embodiment of the present invention, the data structure includes the transmission power of the primary user, the position information of the base station of the secondary user, the transmission antenna gain of the base station, and the transmission power of the base station. A data structure including the position information of the terminal device, the reception power of the terminal device, and the transmission power of the terminal device, and the position information of the terminal device and the reception power of the terminal device are estimated by the primary user. The transmission power of the primary user and the reception power of the terminal device are used to estimate the position of the primary user, and the estimation means estimates the range of the first radio wave, which is the range of the radio wave of the primary user. Used, the transmission power of the base station, the transmission antenna gain of the base station, and the reception power of the terminal device are used by the estimation means to estimate the second radio wave reach range, which is the range of the radio wave of the base station, and the terminal. The transmitted power of the device and the received power used to estimate the second radio wave reach range are used by the determining means to determine the reach of the radio wave transmitted from the terminal device, and the position information of the terminal device and the received power are used. The position information of the base station is used for the determination means to obtain the first distance which is the distance between the base station and the terminal device, and the position information indicating the position of the primary user and the position information of the base station are determined. Means are used to determine the second distance, which is the distance between the primary user and the base station, the first radio wave reach, the second radio wave reach, the radio wave reach, the first distance and the first. The distance 2 is a region in which the range of the radio wave transmitted from the terminal device includes the position of the base station and is outside the range of the first radio wave or within the range of the second radio wave. It is used to determine the terminal transmission permission area, which is the area where the terminal device is permitted to transmit radio waves on the shared frequency shared by the primary user and the base station, and the terminal transmission permission area is generated by the generation means 1. Next Used to generate communication conditions for the terminal device that does not interfere with the user.

According to the configuration 19, the terminal transmission permission area can be determined using the data structure, and the communication condition of the terminal device that does not interfere with the primary user is generated based on the determined terminal transmission permission area.

Therefore, it is possible to reliably avoid interference between the wireless communication of the primary user and the wireless communication of the secondary user.

Interference between the wireless communication of the primary user and the wireless communication of the secondary user can be avoided.

It is a schematic diagram of the wireless communication system by embodiment of this invention. It is a schematic diagram of the communication arbitration device arranged in the base station shown in FIG. It is a schematic diagram of the terminal apparatus shown in FIG. It is a figure which shows the relationship between the received power and the distance from a wave source. It is a conceptual diagram of the table which shows the estimation result of the radio wave reach range of a primary user. It is the schematic of the table which shows the estimation result of the radio wave reach range of a secondary user (base station 1). It is a figure for demonstrating the method of determining the terminal transmission permission area. It is a figure which shows the propagation characteristic. It is another figure for demonstrating the method of determining the terminal transmission permission area. It is a figure for demonstrating another method of determining a terminal transmission permission area. It is a figure for demonstrating still another method of determining a terminal transmission permission area. It is a figure which shows the correspondence relationship between the communication permission content of a terminal apparatus, and a code. It is a figure which shows the communication condition of a terminal apparatus. It is a flowchart for demonstrating operation of a communication arbitration apparatus. It is a flowchart for demonstrating the detailed operation of step S3 shown in FIG. It is a flowchart for demonstrating the detailed operation of step S34 shown in FIG. It is a flowchart for demonstrating the detailed operation of step S35 shown in FIG. It is a flowchart for demonstrating operation of a terminal apparatus. It is a schematic diagram which shows the data structure by embodiment of this invention. It is a schematic diagram which shows another data structure by embodiment of this invention.

Embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated.

FIG. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present invention. With reference to FIG. 1, the wireless communication system 10 according to the embodiment of the present invention includes a base station 1 and a plurality of terminal devices 2.

The base station 1 and the plurality of terminal devices 2 are arranged in the wireless communication space. In FIG. 1, the wave source S is a primary user to which a frequency band has already been allocated, and includes, for example, a radar and a broadcasting station. The base station 1 and the plurality of terminal devices 2 are secondary users. The terminal device 2 is, for example, a mobile terminal such as a smartphone.

The base station 1 receives a Measurement Report (referred to as “terminal information”) including position information, frequency band, transmission power, and reception power in each of the plurality of terminal devices 2 from each terminal device 2.

The base station 1 detects its own position by GPS (Global Positioning System). Further, the base station 1 detects the transmission power Pt _b and the transmission antenna gain g _b when the radio wave is transmitted. Further, the base station 1 detects the received power R _b when the radio wave is received. Then, the base station 1 is based on the position information (x _b , y _b ) indicating its own position, the transmission power Pt _b , the transmission antenna gain g _b , the reception power R _b , and a plurality of terminal information by a method described later. The communication conditions of the secondary user's wireless communication are arbitrated so as to avoid interference between the primary user's wireless communication and the secondary user's wireless communication, and the arbitrated wireless communication communication conditions are set to multiple terminals. Send to device 2.

Each of the plurality of terminal devices 2 periodically detects the position information [xi _i , y _i ] (i is a positive integer) indicating its own position by GPS, and receives the received power RSSI when the radio wave is received. The transmission power Pt _i when _i and the radio wave are transmitted are detected, and the received power RSSI _i and the time _ti when the transmission power Pt _i is detected are detected. Further, each of the plurality of terminal devices 2 detects the frequency band BW _i shared with the primary user.

In the position information [x _i , y _i ], x _i represents longitude and y _i represents latitude. The time ti is represented by _YYYY / MM / DD / h / m / s.

Each of the plurality of terminal devices 2 has its own identification information ID _i , position information [ _xi , y _i ], received power RSSI _i , transmission power Pt _i , frequency band BW _i , and terminal information INFORMATION including time ti ₌ . Generate [ID _i / [x _i , y _i ] / RSSI _i / Pt _i / BW _i / ti], and the generated terminal information INFO_i = [ID _i / [x _i , y _{i ] / RSSI i /} Pt _i / BW _i / ti _] is transmitted to the base station 1.

Each of the plurality of terminal devices 2 receives the communication conditions arbitrated by the base station 1 from the base station 1. Then, each of the plurality of terminal devices 2 performs wireless communication with the base station 1 or another terminal device based on the received communication conditions.

FIG. 2 is a schematic diagram of a communication arbitration device arranged in the base station 1 shown in FIG. The base station 1 includes the communication arbitration device 11 shown in FIG. With reference to FIG. 2, the communication arbitration device 11 includes a receiving means 111, a storage means 112, an estimating means 113, a determining means 114, and a transmitting means 115.

The receiving means 111 has a built-in timer. The receiving means 111 receives terminal information INFORMATION_i, identification information ID _b of base station 1, transmission power Pt _b , transmission antenna gain g _b , reception power R _b , and position information (x _b , y _b ) from the host system of base station 1. Is received, and the time t _b at the time of receiving these is detected.

Then, the receiving means 111 stores the received terminal information INFORMATION_i in the storage means 112. Further, the receiving means 111 associates the identification information ID _b of the base station 1, the transmission power Pt _b , the transmission antenna gain g _b , the reception power R _b , the position information (x _b , y _b ), and the time t _b with each other. The base station information INFORMATION_b = [ID _b / [x _b , y _b ] / Pt _b / g _b / R _b / t _b ] is stored in the storage means 112.

The storage means 112 stores the terminal information INFO_i and the base station information INFO_b received from the receiving means 111.

The estimation means 113 is transmitted from the reach range COVG1 and the base station 1 of the radio waves transmitted from the primary user by the method described later based on the terminal information INFO_i and the base station information INFO_b stored in the storage means 112. The range of radio waves _COVG2 and the position information (xG, _yG ) indicating the position of the primary user are estimated. Then, the estimation means 113 outputs the estimated reach range COVG1 and COVG2 of the radio wave to the determination means 114, and stores the position information (x _G , y _G ) in the storage means 112.

The determination means 114 receives the radio wave reach COVG1 and COVG2 from the estimation means 113. Then, the determination means 114 is a method described later based on the range COVG1, COVG2 of the radio wave, the terminal information INFORMATION_i stored in the storage means 112, and the position information (x _b , y _b ), (x _G , y _G ). Determines the terminal transmission permission area TALWRG. This terminal transmission permission area TALWRG is an area in which the range of the radio wave transmitted from the terminal device 2 includes the position of the base station 1 and is outside the range COVG1 of the radio wave or within the range COVG2 of the radio wave, and is a terminal. This is an area where the device 2 is permitted to transmit radio waves on a shared frequency shared by the primary user and the secondary user (base station 1 and a plurality of terminal devices 2).

When the terminal transmission permission area TALWRG is determined, the determination means 114 generates communication conditions of the plurality of terminal devices 2 based on the determined terminal transmission permission area TALWRG and outputs the communication conditions to the transmission means 115.

The transmission means 115 receives the communication conditions of the plurality of terminal devices 2 from the determination means 114, and transmits the received communication conditions to the plurality of terminal devices 2.

FIG. 3 is a schematic view of the terminal device 2 shown in FIG. With reference to FIG. 3, the terminal device 2 includes an antenna 21, a receiving means 22, a storage means 23, a GPS receiver 24, a control means 25, and a transmitting means 26.

The receiving means 22 receives radio waves via the antenna 21 and detects the received power RSSI _i when the radio waves are received. Further, the receiving means 22 detects the frequency band BW _i . Further, the receiving means 22 has a built-in timer, and detects the received power RSSI _i and the time _ti when the frequency band BW _i is detected. Then, the receiving means 22 stores the time ti, the received power RSSI _i , and the frequency band BW _i in the storage means 23 in association with each _other .

The receiving means 22 receives the communication condition via the antenna 21, and stores the received communication condition in the storage means 23.

The storage means 23 receives the time ti, the received power RSSI _i , and the frequency band BW _i from the receiving means 22, and _{stores the received time ti, the received power RSSI i ,} and the frequency band BW _i in association with _each other. Further, the storage means 23 receives the communication condition from the receiving means 22, and stores the received communication condition.

The GPS receiver 24 receives a GPS signal and detects longitude and latitude based on the received GPS signal. Then, the GPS receiver 24 stores the detected longitude and latitude as position information ( _xi , y _{i )} in the storage means 23 in association with the time ti, the received power RSSI _i , and the frequency band BW _i .

The control means 25 holds the identification information ID _i of the terminal device 2. Further, the control means 25 determines a transmission power Pt _i when the terminal device 2 transmits a radio wave, and outputs the determined transmission power Pt _i to the transmission means 26. Then, when the control means 25 outputs the transmission power Pt _i to the transmission means 26, the control means 25 associates the transmission power Pt _i with the time ti, the position information ( _xi , _{y i} ), the reception power RSSI _i , and the frequency band BW _i . And store it in the storage means 23.

The control means 25 has a built-in timer, and when it detects that a certain period of time has elapsed with reference to the timer, it detects time ti, position information ( _xi , _{y i} ), transmission power Pt _i , and reception power RSSI _i . And the frequency band BW _i is read from the storage means 23. Then, the control means 25 includes terminal information INFORMATION including time ti, position information ( _xi , y _i ), transmission power Pt _i , reception power RSSI _i , frequency band BW _i , and identification information ID _i = [ID _] . _i / [x _i , y _i ] / RSSI _i / Pt _i / BW _i / ti _] is generated. Then, the control means 25 outputs the generated terminal device INFORMATION_i to the transmission means 26.

Further, when the control means 25 receives the transmission signal from the application, the control means 25 reads out the communication condition from the storage means 23. Then, the control means 25 determines whether or not the transmission of the radio wave by the terminal device 2 on which the user is mounted is stopped based on the communication conditions.

When it is determined that the transmission of the radio wave by the terminal device 2 on which the user is mounted has not been stopped, the control means 25 controls the wireless communication of the terminal device 2 according to the communication permission contents included in the communication conditions.

On the other hand, when it is determined that the transmission of the radio wave by the terminal device 2 on which the self is mounted is stopped, the control means 25 stops the transmission of the transmission signal received from the application.

The transmission means 26 receives the transmission power Pt _i and the transmission signal from the control means 25. When the transmission means 26 receives the transmission signal from the control means 25, the transmission means 26 transmits the transmission signal to the base station 1 (or another terminal device) via the antenna 21 with the transmission power Pt _i .

Further, when the transmission means 26 receives the terminal information INFO_i from the control means 25, the transmission means 26 transmits the received terminal information INFO_i to the base station 1 via the antenna 21 with the transmission power Pt _i .

A method of estimating the range COVG1 of the radio wave of the primary user and the range COVG2 of the radio wave of the base station 1 in the communication arbitration device 11 will be described. The estimation means 113 reads a plurality of terminal information INFO_i from the storage means 112, and the wave source is based on a plurality of position information [ _xi , y _i ] and a plurality of received power RSSI _i included in the read plurality of terminal information INFO_i. Estimate the position.

The method of estimating the wave source position will be described.

The estimation means 113 calculates the center of gravity [x _G , y _G ] of the plurality of terminal devices 2 by the following equation.

In the formula (1), wi represents the weight of the _i -th terminal device (any of the plurality of terminal devices 2), and is composed of the received power RSSI _i in the i-th terminal device.

Then, the estimation means 113 estimates the center of gravity (x _G , y _G ) calculated by the equation (1) as the wave source position. That is, the estimation means 113 estimates the center of gravity [x _G , y _G ] of the plurality of terminal devices 2 weighted by the received power RSSI _i as the wave source position (position of the primary user S).

FIG. 4 is a diagram showing the relationship between the received power and the distance from the wave source. In FIG. 4, the vertical axis represents the received power, and the horizontal axis represents the distance from the wave source S.

With reference to FIG. 4, the received power RSSI _i is attenuated in inverse proportion to the distance from the wave source S. As a result, the received power RSSI _i becomes larger as it approaches the wave source S, so that the effect of weighting by the received power RSSI _i is greater in the vicinity of the wave source S. Therefore, the estimated value estimated by the estimation method with the center of gravity [x _G , y _G ] as the wave source position approaches the vicinity of the wave source.

When the estimation means 113 estimates the wave source position [x _G , y _G ], the estimation means 113 estimates the range COVG 1 of the radio wave of the primary user by using the estimated wave source position [x _G , y _G ]. More specifically, the estimation means 113 estimates the maximum radius at which the received power of the radio wave transmitted from the primary user is equal to or less than a certain value (set value) as the reach range COVG1 of the radio wave of the primary user. The set value is set in consideration of the allowable interference power, the interference margin, and the like. The estimation means 113 detects the received power RSSI _{i_low} that is equal to or less than the set value among the plurality of received power RSSI _i included in the plurality of terminal information INFO_i stored in the storage means 112, and the detected received power RSSI _i . The distance between the position of the terminal device having _low (at least one of the plurality of terminal devices 2) and the wave source position [x _G , y _G ] is calculated, and the maximum value of the calculated distance is used as the primary user. It is estimated as the range COVG1 of the radio wave of S.

Further, when the transmission power of the primary user is known, the estimation means 113 estimates the range COVG1 of the radio wave of the primary user by using the radio wave propagation model. For example, when the estimation means 113 uses a free space propagation model as a radio wave propagation model, the distance d- _primary is calculated based on the following equation, and the calculated distance d- _primary is set as the range COVG1 of the radio wave of the primary user. presume.

In equation (2), _PT is the transmission power of the primary user, PR is the reception power _{RSSI i} of the terminal device (any of the plurality of terminal devices 2), and λ is the wavelength of the radio wave. Is. The equation (2) is a relational equation when an isotropic antenna is used.

The estimation means 113 substitutes the plurality of received power RSSI _i included in the plurality of terminal information _{INFO_i} , the transmission power of the primary user, and the wavelength into PR, P _T , and λ of the equation (2), respectively, and a plurality of. The distance d- _primary is calculated, and the maximum distance among the plurality of calculated distances d- _primary is estimated as the range COVG1 of the radio wave of the primary user.

FIG. 5 is a conceptual diagram of a table showing the estimation results of the radio wave reachable range COVG1 of the primary user. With reference to FIG. 5, Table TBL-1 includes a primary user ID, a time, a bandwidth, a longitude, a latitude, and a radius. The primary user ID, time, bandwidth, longitude, latitude and radius are associated with each other.

The estimation means 113 is the terminal information INFORMATION_i = [ID _i / [x _i , y _i ] / RSSI of the terminal device (any of a plurality of terminal devices 2) used for estimating the range COVG1 of the radio wave of the primary user. _i / Pt _i / BW _i / ti] is read from the storage means 112, and the read terminal information INFORMATION_i = [ID _i / [x _i , _{y i} ] / RSSI _i / Pt _i / BW _i / ti _] The time ti and the bandwidth BW _i are detected, and the detected time _ti and the bandwidth BW _i are stored in the time and bandwidth in Table _TBL -1, respectively.

Further, the estimation means 113 stores the primary user ID in the primary user ID of the table TBL-1, and stores the estimated wave source position [x _G , y _G ] in the longitude and latitude of the table TBL-1. , The estimated range of radio waves of the primary user COVG1 (maximum distance among a plurality of distances d- _primary ) is stored in the radius of Table TBL-1.

The estimation means 113 performs the above processing for all the primary users, creates a table TBL-1, and stores the created table TBL-1 in the storage means 112.

The estimation means 113 reads the base station information INFORMATION_b = [ID _b / [x _b , y _b ] / Pt _b / g _b / R _b / t _b ] from the storage means 112, and the read base station information INFORMATION_b = [ From ID _b / [x _b , y _b ] / Pt _b / g _b / R _b / t _b ] transmission power Pt _b , transmission antenna gain g _b and position information [x _b , y _b ] (= longitude, latitude) Is detected. Further, the estimation means 113 reads the terminal information INFORMATION_i = [ID _i / [x _i , y _i ] / RSSI _i / Pt _i / BW _i / ti _] from the storage means 112, and the read terminal information INFORMATION_i = [ The received power RSSI _i is detected from the ID _i / [x _i , y _i ] / RSSI _i / Pt _i / BW _i / ti _] .

Then, the estimation means 113 substitutes the transmission power Pt _b , the transmission antenna gain g _b , and the reception power RSSI _i (= _Ri ) into the following equation, and sets the reception power RSSI _i of the radio wave transmitted from the base station 1. Calculate the distance r that becomes a value.

In equation (3), Pt _b represents the transmission power of the base station 1, g _b represents the transmission antenna gain of the base station 1, r represents the distance from the base station 1, and λ represents the radio wave. Represents a wavelength.

Then, the estimation means 113 uses the calculated distance r as a radius representing the range COVG2 of the radio wave of the secondary user (base station 1).

FIG. 6 is a schematic diagram of a table showing the estimation results of the radio wave reachable range COVG2 of the secondary user (base station 1). With reference to FIG. 6, Table TBL-2 includes base station information and terminal device information. Base station information and terminal device information are associated with each other.

The base station information includes identification information, a radius, a longitude, and a latitude. Radius, longitude and latitude are associated with each other.

The terminal device information includes identification information, bandwidth, transmission power, longitude, and latitude. Identification information, bandwidth, transmit power, longitude and latitude are associated with each other.

The estimation means 113 reads the base station information INFORMATION_b = [ID _b / [x _b , y _b ] / Pt _b / g _b / R _b / t _b ] from the storage means 112, and the read base station information INFORMATION_b = [ The identification information ID _b and the position information [x _b , y _b ] are detected from the ID _b / [x _b , y _b ] / Pt _b / g _b / R _b / t _b ]. Then, the estimation means 113 stores the identification information ID _b in the identification information of the base station information, and stores x _b and y _b of the position information [x _b , y _b ] in the longitude and latitude of the base station information, respectively. Further, the estimation means 113 reads the radio wave reachable range COVG2 from the storage means 112, and stores the read radio wave reachable range COVG2 in the radius of the base station information.

Further, the estimation means 113 reads the terminal information INFORMATION_i = [ID _i / [x _i , y _i ] / RSSI _i / Pt _i / BW _i / ti _] from the storage means 112, and the read terminal information INFORMATION_i = [ Detects identification information ID _i , bandwidth BW _i , transmission power Pt _i , and location information [x _i , y _i ] from ID _i / [x _i , y _i ] / RSSI _i / Pt _i / BW _i / ti _] . do. Then, the estimation means 113 stores the identification information ID _i , the bandwidth BW _i , and the transmission power Pt _i in the identification information, the bandwidth, and the transmission power of the terminal device information, respectively, and x of the position information [x _i , y _i ]. _i and y _i are stored in the longitude and latitude of the terminal device information, respectively.

In Table TBL-2, a plurality of terminal devices 2 having identification information ID _i = 11, 12, ... Are associated with a base station having identification information ID _b = 2, and identification information ID _i = 21. , 22, ... A plurality of terminal devices 2 are associated with a base station having identification information ID _b = 3. Then, the plurality of terminal devices 2 associated with the base station having the identification information ID _b = 2 (the plurality of terminal devices having the identification information ID _i = 11, 12, ...) Have the identification information ID _b = 2. It is a terminal device existing in the range COVG2 of the radio wave of the base station having the identification information ID _b = 3, and a plurality of terminal devices 2 associated with the base station having the identification information ID b = 3 (identification information ID _i = 21, 22, ... The plurality of terminal devices having (.) Are terminal devices existing within the range COVG2 of the radio wave of the base station having the identification information ID _b = 3.

Thus, in Table TBL-2, at least one terminal device 2 is associated with one base station.

Note that Table TBL-2 includes a plurality of base station information when the base station 1 receives the terminal information INFORMATION_i from another base station, and the base station 1 receives the terminal information INFORMATION_i from the other base station. If not, Table TBL-2 contains one base station information.

The estimation means 113 creates a table TBL-2 by the method described above, and stores the created table TBL-2 in the storage means 112.

A method of determining the terminal transmission permission area TALWRG will be described. FIG. 7 is a diagram for explaining a method of determining the terminal transmission permission area TALWRG.

With reference to FIG. 7, the radio wave reachable range COVG1 of the primary user S and the radio wave reachable range COVG2 of the secondary user (base station 1) have, for example, a circular shape. The range COVG1 of the radio wave of the primary user S is separated from the range COVG2 of the radio wave of the secondary user (base station 1). That is, the sum R _COVG1 + R _COVG2 of the radius R _{COVG1 of the radio wave reachable range COVG1 and the radius R COVG2 of} the radio wave reachable range COVG2 of the secondary user (base station 1) is the position of the primary user S and the secondary user S. The distance to the position of the user (base station 1) is smaller than _dSb .

In such a situation, the terminal devices 2 (2a) and 2 (2b) existing in the range COVG2 of the radio wave of the secondary user (base station 1) receive the radio wave transmitted from the primary user S. Since reception is not possible, the secondary user base station 1 cannot acquire information about the primary user S. That is, the base station 1 of the secondary user cannot recognize the primary user S.

Therefore, the determination means 114 of the communication arbitration device 1 so that the range of the radio waves transmitted by the terminal devices 2 (2a) and 2 (2b) existing in the range COVG2 of the radio wave is within the range COVG2 of the radio wave. The terminal transmission permission area TALWRG is determined.

More specifically, the determination means 114 determines the terminal transmission permission area TALWRG by the following method. FIG. 8 is a diagram showing propagation characteristics. In FIG. 8, the vertical axis represents the propagation loss and the horizontal axis represents the distance from the source of the radio wave.

The determining means 114 reads the transmission power Pt _b and the position information [x _b , y _b ] of the base station 1 and the received power RSSI _i and the position information [xi _i , y _i ] of the terminal device 2 from the storage means 112. ..

Then, the determining means 14 obtains the propagation loss L _LOS by calculating Pt _b -RSSI _i = L _LOS . After that, the determining means 114 determines a propagation model suitable for the obtained propagation loss L _LOS . More specifically, the determining means 114 includes the transmission power Pt _b and the position information [x _b , y _b ] of the base station 1, the plurality of received power RSSI _i of the plurality of terminal devices 2, and the plurality of position information [x]. _i , y _i ], a plurality of propagation losses L _LOS and a plurality of distances between the base station 1 and a plurality of terminal devices 2 are obtained, and a plurality of propagation losses L _LOS and a plurality of distances are propagated. And plot as the relationship with the distance. Then, the determining means 114 obtains the propagation characteristic k1 (characteristic indicating the relationship between the propagation loss and the distance) fitted to the plotted points (see the white circle in FIG. 8). Then, the determining means 114 determines the propagation model corresponding to the propagation characteristic k1 as the propagation model suitable for the propagation loss L _LOS .

Here, the determining means 114 determines, for example, a short range propagation model within 1000 m from the source as a propagation model suitable for the propagation loss L _LOS .

In the short range propagation model, the propagation loss L _LOS is expressed by the following equation.

In the equation (4), f is a frequency and d is a distance [m] from the source.

After that, the determination means 114 substitutes the shared frequency shared with the primary user S into the frequency f of the equation (4) to obtain the propagation characteristic k2.

Subsequently, the determination means 114 obtains the difference Pt _i -RSSI i between the transmission power Pt _i of the terminal device 2 and the reception power RSSI _i when the range _COVG2 of the radio wave is determined as the propagation loss L _LOS , and obtains the difference. The distance d _{ARV_j} (j is an integer of 1 to J and J is the total number of transmission powers) corresponding to the propagation loss L _LOS is obtained based on the propagation characteristic k2. This distance d _{ARV_j} is the reachable distance of the radio wave transmitted from the terminal device 2.

By using any of 14 [dBm], 17 [dBm], 20 [dBm], and 23 [dBm] as the transmission power Pt _i of the terminal device 2, the four distances d _{ARV_1} to d _{ARV_4} are 14 [d], respectively. It is obtained corresponding to the transmission power Pt _i of [dBm], 17 [dBm], 20 [dBm] and 23 [dBm].

FIG. 9 is another diagram for explaining a method of determining the terminal transmission permission area TALWRG. With reference to FIG. 9, the determining means 114 determines the distance d _bt = {(x) between the base station 1 and the terminal device 2 based on the position information [x _b , y _b ], [x _i , y _i ]. _b -x _i ) ² + (y _b -y _i ) ² } ^1/2 is obtained, and the point P whose distance from the terminal device 2 is the distance d _{ARV_j} in the direction from the base station 1 to the terminal device 2 is obtained. .. The circle CIR shown in FIG. 9 is a circle centered on the position of the terminal device 2 (the position represented by the position information [ _xi , y _i ]) and has the distance d _{ARV_j} as the radius, and is transmitted from the terminal device 2. Represents the reach of radio waves.

Then, the determining means 114 determines whether or not d _{bt ≦ d ARV_j is} satisfied. When d _{bt ≤ d ARV_j does} not hold, the determining means 114 discards the distance d _{ARV_j} . On the other hand, when d _{bt ≤ d ARV_j is} satisfied, the determining means 114 further determines whether or not d _{bt + d ARV_j ≤} (radius R _COVG 2 of the radio wave reachable range COVG 2) is satisfied.

When d _{bt + d ARV_j ≦} (radius R _COVG 2 of the radio wave reachable range COVG 2) is established, the determining means 114 determines the position of the terminal device 2 (the position represented by the position information [x _i , y _i ]). The distance d _{ARV_j} is held as a position for determining the terminal transmission permission area TALWRG. On the other hand, when d _{bt + d ARV_j ≤} (radius R _COVG 2 of the radio wave reachable range COVG2) is not established, the determining means 114 is the position represented by the position of the terminal device 2 (position information [x _i , y _i ]). ) Is not a position for determining the terminal transmission permission area TALWRG, and the distance d _{ARV_j} is discarded.

The condition that _dbt ≤ _{d ARV_j} is satisfied is that the radio wave transmitted from the terminal device 2 does not reach the base station 1 unless dbt ≤ d _{ARV_j} is satisfied.

The determining means 114 executes the above processing for all of the transmission power Pt _i , and both _{dbt ≦ d ARV_j and dbt} + d _{ARV_j} ≦ (radius R _COVG2 of the radio wave reachable range COVG2) are satisfied. The distance d _{ARV_j'} (j'is an integer satisfying 1 ≦ j'≦ J) is held. Then, the determining means 114 obtains the maximum distance d _{ARV_j'_max} of the held distance d _{ARV_j'} .

Assuming that the total number of terminal devices 2 is I (I is an integer), the determining means 114 has a maximum distance d _{ARV_j'_max_2_1} for all of the I terminal devices 2_1 to 2_I existing in the range COVG2 of the radio wave. _~ D _{ARV_j'_max_2_I} is obtained, and the maximum value d _{ARV_j'_MAX} of the maximum distance d _{ARV_j'_max_2_1 to} d _{ARV_j'_max_2_I} is obtained.

Then, the determination means 114 transmits the area surrounded by the circle centered on the position of the base station 1 and the distance between the terminal device 2 having the obtained maximum value d _{ARV_j'_MAX} and the base station 1 as the radius. Determined as the allowed area TALWRG (see FIG. 7).

As described above, when the information regarding the primary user S cannot be acquired, the determination means 114 has a range of radio waves transmitted by the terminal devices 2 (2a) and 2 (2b) existing in the range COVG2 of the radio waves. The terminal transmission permission area TALWRG is determined so as to be within the range of radio waves COVG2.

Then, the terminal device 2 (2b) existing in the terminal transmission permission area TALWRG can transmit and receive radio waves to and from the base station 1 at a shared frequency.

On the other hand, the terminal device 2 (2a) existing in the range of the radio wave COVG 2 and outside the terminal transmission permission area TALWRG can receive the radio wave from the base station 1 at the shared frequency, but the radio wave to the base station 1 at the shared frequency. Cannot be sent. This is because if the terminal device 2 (2a) transmits a radio wave at a shared frequency, the base station 1 may interfere with an unrecognizable primary user S.

Therefore, the terminal transmission permission area TALWRG is determined from the area where the terminal device 2 can transmit and receive radio waves to and from the base station 1 at the shared frequency (= terminal transmission permission area TALWRG) and the area where the terminal device 2 can transmit and receive radio waves from the base station 1 at the shared frequency. Corresponds to the determination of the area (the area within the range COVG2 of the radio wave, which is outside the terminal transmission permission area TALWRG), which can receive the radio wave of the above but cannot transmit the radio wave to the base station 1.

FIG. 10 is a diagram for explaining another method for determining the terminal transmission permission area TALWRG. With reference to FIG. 10, the base station 1 recognizes the primary user S in cooperation with another base station. That is, the base station 1 recognizes the position of the primary user S (the position represented by the position information [x _G , y _G ]) and the range COVG 1 of the radio wave. The area REG1 is the reach of the radio wave transmitted from the terminal device 2. Further, since the circle defining the radio wave reach range COVG1 does not intersect or touch the circle defining the radio wave reach range COVG2, the primary user S and the secondary user (base station 1) Does not interfere with.

In such a situation, the determination means 114 determines the terminal transmission distance permission area TALWRG so that the range of the radio wave transmitted from the terminal device 2 is outside the range COVG1 of the radio wave of the primary user S.

The determining means 114 obtains the distance d _{ARV_j} by the method described with reference to FIGS. 7 to 9. Then, the determination means 114 obtains the distance dS _-b between the primary user S and the base station 1.

Then, the determining means 114 determines whether or not _{dbt ≦ d ARV_j is} satisfied as described with reference to FIGS. 7 to 9.

When d _{bt ≤ d ARV_j does} not hold, the determining means 114 discards the distance d _ARV . On the other hand, when d _{bt ≦ d ARV_j is} satisfied, the determining means 114 further determines whether or not d Sb −R _COVG1 > _dbt + _{d ARV_j} > R _COVG2 is satisfied.

On the straight line connecting the primary user S and the base station 1, the radius R _COVG1 represents the distance between the position of the primary user S and the circle defining the range COVG1 of the radio wave, and is d _{bt + d ARV_j .} Represents the distance between the position of the base station 1 and the circle defining the reach range REG1 of the radio wave transmitted from the terminal device 2. As a result, if the subtraction result (= dSb _- R _COVG1 ) obtained by subtracting the radius R _COVG1 from the distance dSb is larger than _dbt + d _{ARV_j} (that is, _{dSb- R COVG1} > d). ₍ If bt + d _{ARV_j} is established), the circle defining the range COVG1 of the radio wave does not touch or intersect the circle defining the reach range REG1 of the radio wave. Further, when the primary user S and the secondary user (base station 1) do not interfere with each other, dS _-b- R _COVG1 > R _COVG2 is established. As a result, the reach range REG1 of the radio wave transmitted from the terminal device 2 is outside the reach range COVG1 of the radio wave of the primary user S. Therefore, the determining means 114 determines whether or not dSb _- R _COVG1 > _dbt + d _{ARV_j} > R _COVG2 is established.

When dSb _- R _COVG1 > _dbt + d _{ARV_j} > R _COVG2 is established, the determining means 114 determines the position of the terminal device 2 (the position represented by the position information [x _i , y _i ]). The distance d _{ARV_j} is held as a position for determining the transmission permission area TALWRG. On the other hand, when dSb _- R _COVG1 > _dbt + d _{ARV_j} > R _COVG2 is not established, the determination means 114 is the position of the terminal device 2 (the position represented by the position information [x _i , y _i ]). Is not the position for determining the terminal transmission permission area TALWRG, and the distance d _{ARV_j} is discarded.

The determining means 114 executes the above processing for all of the transmission power Pt _i , and the distance at which both dbt ≤ d _{ARV_j} and _{dSb- R COVG1} > _dbt + d _{ARV_j} > R _COVG2 are established. d _{Holds ARV_j'} . Then, the determining means 114 obtains the maximum distance d _{ARV_j'_max} of the held distance d _{ARV_j'} .

After that, the determining means 114 obtains the maximum distance d _{ARV_j'_max_2-1 to} d _{ARV_j'_max_2_I} for all of the I terminal devices 2_1 to 2_I existing in the range COVG2 of the radio wave, and the determined maximum distance d _{ARV_j.} The maximum value d _{ARV_j'_MAX among'_max_2_1 to} d _{ARV_j'_max_2_I} is obtained.

Then, the determination means 114 transmits the area surrounded by the circle centered on the position of the base station 1 and the distance between the terminal device 2 having the obtained maximum value d _{ARV_j'_MAX} and the base station 1 as the radius. Determined as the allowed area TALWRG (see FIG. 10).

In this way, when the primary user S can be recognized, the determination means 114 determines the terminal transmission distance so that the range of the radio wave transmitted from the terminal device 2 is outside the range COVG1 of the radio wave of the primary user S. Determine the allowed area TALWRG.

Within the terminal transmission permission area TALWRG, the terminal device 2 can transmit and receive radio waves to and from the base station 1 at a shared frequency.

On the other hand, the terminal device 2 existing in the area outside the terminal transmission permission area TALWRG (shaded portion in FIG. 10) within the range of the radio wave COVG2 can receive the radio wave from the base station 1 at the shared frequency, but the shared frequency. Cannot transmit radio waves to base station 1. This is because if the terminal device 2 transmits radio waves at a shared frequency, it may interfere with the primary user S.

Therefore, determining the terminal transmission permission area TALWRG by the method shown in FIG. 10 is shared by the terminal device 2 and the area where the terminal device 2 can transmit and receive radio waves at a frequency shared with the base station 1 (= terminal transmission permission area TALWRG). This corresponds to determining a region in which radio waves from the base station 1 can be received but cannot be transmitted to the base station 1 at a frequency (a region within the range COVG 2 of the radio waves, which is outside the terminal transmission permitted region TALWRG).

Even if the terminal device 2 existing in the area outside the terminal transmission permission area TALWRG (shaded portion in FIG. 10) within the range of the radio wave COVG2 transmits the radio wave to the base station 1 at a frequency other than the shared frequency. Often, radio waves having directivity in the direction of base station 1 may be transmitted to base station 1 at a shared frequency.

FIG. 11 is a diagram for explaining still another method for determining the terminal transmission permission area TALWRG. With reference to FIG. 11, the base station 1 determines the position of the primary user S (the position represented by the position information [x _G , y _G ]) and the range COVG 1 of the radio wave in cooperation with other base stations. It has recognized. A part of the range COVG2 of the radio wave overlaps with a part of the range COVG1 of the radio wave, and the primary user S and the secondary user (base station 1) interfere with each other.

In such a situation, the determination means 114 determines the terminal transmission distance permission area TALWRG so that the range of the radio wave transmitted from the terminal device 2 is outside the range COVG1 of the radio wave of the primary user S.

More specifically, the determining means 114 obtains the distance d _{ARV_j} by the method described with reference to FIGS. 7 to 9. Then, the determination means 114 obtains the distance dS _-b between the primary user S and the base station 1.

Then, in order for the range of the radio wave transmitted from the terminal device 2 to be outside the range of the radio wave COVG1, it is necessary that dSb _- R _COVG1 > _dbt + d _{ARV_j} is established as described above. Further, when the primary user S and the secondary user (base station 1) interfere with each other, dS _-b- R _COVG1 ≤ R _COVG2 is established.

Therefore, the determining means 114 determines whether or not both d bt + d _{ARV_j} <d _{S-b- R COVG1 ≤} R _COVG2 and dbt ≤ d _{ARV_j} are satisfied.

When the determination means 114 determines that both d bt + d _{ARV_j} <d _{S-b- R COVG1 ≤} R _COVG2 and dbt ≤ d _{ARV_j} are satisfied, the position of the terminal device 2 (position information [x]). The distance d _{ARV_j} is held with the position represented by _i , y _i ] as the position for determining the terminal transmission permission area TALWRG.

On the other hand, when the determination means 114 determines that at least one of d bt + d _{ARV_j} <d _{S-b- R COVG1 ≤} R _COVG2 and dbt ≤ d _{ARV_j} does not hold, the terminal device 2 The distance d _{ARV_j} is discarded because the position (the position represented by the position information [ _xi , y _i ]) is not the position for determining the terminal transmission permission area TALWRG.

The determining means 114 executes this process for all of the transmission powers Pt _i (14 [dBm], 17 [dBm], 20 [dBm] and 23 [dBm]), and dbt + d _{ARV_j} <dS _{- b} . The maximum distance d _{ARV_j'_max} at which both -R _COVG1 ≤ R _COVG2 and _dbt ≤ d _{ARV_j} are satisfied is obtained.

After that, the determining means 114 obtains the maximum distance d _{ARV_j'_max_2-1 to} d _{ARV_j'_max_2_I} for the I terminal devices 2 existing in the range COVG2 of the radio wave, and the obtained maximum distance d _{ARV_j'_max_2-1 to} d. The maximum value d _{ARV_j'_MAX} of _{ARV_j'_max_2_I} is obtained.

Then, the determination means 114 transmits the area surrounded by the circle centered on the position of the base station 1 and the distance between the terminal device 2 having the obtained maximum value d _{ARV_j'_MAX} and the base station 1 as the radius. Determined as the allowed area TALWRG (see FIG. 11).

In this way, when the primary user S can be recognized and the primary user S and the secondary user (base station 1) interfere with each other, the determination means 114 has a range of radio waves transmitted from the terminal device 2. The terminal transmission distance permission area TALWRG is determined so as to be outside the range COVG1 of the radio wave of the primary user S.

Within the terminal transmission permission area TALWRG, the terminal device 2 can transmit radio waves to the base station 1 and / or another terminal device 2 at a shared frequency (see (a) and (b) in FIG. 11). , The radio wave from the base station 1 cannot be received at the shared frequency. This is because the radio wave from the base station 1 may reach the outside of the terminal transmission permission area TALWRG and interfere with the primary user S.

On the other hand, the terminal device 2 existing outside the terminal transmission permission area TALWRG within the range of the radio wave COVG2 cannot transmit and receive radio waves to and from the base station 1 and other terminal devices 2 at a shared frequency. This is because there is a risk of interfering with the primary user S.

Therefore, determining the terminal transmission permission area TALWRG by the method shown in FIG. 11 means that the terminal device 2 can transmit and receive radio waves to and from the base station 1 and / or another terminal device 2 at a shared frequency (= terminal transmission permission area TALWRG). ) And the area where the terminal device 2 cannot transmit and receive radio waves to and from the base station 1 and other terminal devices 2 on the shared frequency (the area within the radio wave reach range COVG2 but outside the terminal transmission permission area TALWRG). Equivalent to.

FIG. 12 is a diagram showing a correspondence relationship between the communication permission content of the terminal device 2 and the code. The communication permission content shown in FIG. 12 is the communication permission content when the shared frequency is used.

With reference to FIG. 12, Table TBL-3 includes reference numerals and communication permission contents. The code and the communication permission content are associated with each other. The code "00" is associated with the communication permission content of "sending and receiving radio waves with the base station", and the code "01" is associated with the communication permission content of "receiving radio waves from the base station". The code of "10" is associated with the communication permission content of "transmitting radio waves to the base station", and the code of "11" is associated with the communication permission content of "transmitting and receiving radio waves with other terminal devices". The storage means 23 of the terminal device 2 stores Table TBL-3.

FIG. 13 is a diagram showing communication conditions of the terminal device 2. With reference to FIG. 13, the communication condition CMCD includes an identification information ID, a stop signal, communication permission contents, and transmission power. The identification information ID, the stop signal, the communication permission content, and the transmission power are associated with each other. The identification information ID represents the identification information of the terminal device 2. The stop signal is represented by "1" when the transmission of radio waves is stopped, and is represented by "0" when the transmission of radio waves is not stopped. No communication permission content is stored when the stop signal consists of "1". Further, the communication permission content is composed of any of "00", "01", "10" and "11" when the stop signal is "0". No transmission power is stored when the stop signal consists of "1". Further, as the transmission power, when the stop signal is "0", the transmission power when the above-mentioned distance d _{ARV_j'_MAX} is obtained is stored. That is, the determination means 114 determines the transmission power of the terminal device 2 used for determining the terminal transmission permission area TALWRG as the transmission power of the terminal device 2 in the terminal transmission permission area TALWRG, and stores it in the transmission power of the communication condition CMCD.

In FIG. 13, the terminal device having the identification information ID = 1 has a stop signal of "1", and the transmission of radio waves is stopped. The terminal device having the identification information ID = 2 has a stop signal of "0", a communication permission content of "00", and a transmission power of 17 [dBm]. As a result, the terminal device having the identification information ID = 2 is permitted to transmit radio waves to the base station with a transmission power of 17 [dBm] and receive radio waves from the base station. The terminal device having the identification information ID = 3 has a stop signal of "0", a communication permission content of "10", and a transmission power of 23 [dBm]. As a result, the terminal device having the identification information ID = 3 is permitted to transmit radio waves to the base station with a transmission power of 23 [dBm].

When the determination means 114 of the communication arbitration device 11 determines the terminal transmission permission area TALWRG shown in FIG. 7, the terminal device 2 (2b) existing in the determined terminal transmission permission area TALWRG is referred to from “00”. Communication permission content consisting of "01" is given to the terminal device 2 (2a) existing in the terminal transmission permission area TALWRG within the range COVG2 of the radio wave.

Further, when the determination means 114 determines the terminal transmission permission area TALWRG shown in FIG. 10, the determination means 114 grants the communication permission content consisting of "00" to the terminal device 2 existing in the determined terminal transmission permission area TALWRG. Then, the communication permission content consisting of "01" is given to the terminal device 2 existing in the area outside the terminal transmission permission area TALWRG (the shaded area in FIG. 10) within the range COVG2 of the radio wave.

Further, when the determination means 114 determines the terminal transmission permission area TALWRG shown in FIG. 11, the communication permission consisting of "10" is given to the terminal device 2 (2b) existing in the determined terminal transmission permission area TALWRG. The contents are given, or the communication permission contents consisting of "11" are given to the two terminal devices 2 (2a) and 2 (2b) existing in the terminal transmission permission area TALWRG.

Further, when the determination means 114 determines the terminal transmission permission area TALWRG shown in FIGS. 7, 10 and 11, it is determined that _{dbt ≦ d ARV_j does} not hold for all the transmission powers. A stop signal consisting of "1" is given to the device 2.

As described above, the determination means 114 generates the communication condition CMCD of the plurality of terminal devices 2 based on the terminal transmission permission area TALWRG.

FIG. 14 is a flowchart for explaining the operation of the communication arbitration device 11. With reference to FIG. 14, when the operation of the communication arbitration device 11 is started, the communication arbitration device 11 collects a plurality of terminal information INFORMATION_i of the plurality of terminal devices 2 (step S1).

Then, the estimation means 113 of the communication arbitration device 11 estimates the range COVG1 of the radio wave of the primary user S and the range COVG2 of the radio wave of the secondary user (base station 1) by the method described above (step). S2).

After that, the determination means 114 determines the terminal transmission permission area TALWRG so as not to interfere with the primary user S based on the reach range COVG1 and COVG2 of the radio wave received from the estimation means 113 (step S3).

Then, the determination means 114 creates the communication condition CMCD of each terminal device 2 based on the determined terminal transmission permission area TALWRG (step S4).

Then, the transmission means 115 receives the communication condition CMCD from the determination means 114, and transmits the received communication condition CMCD to the plurality of terminal devices 2 (step S5). As a result, the operation of the communication arbitration device 11 ends.

FIG. 15 is a flowchart for explaining the detailed operation of step S3 shown in FIG. With reference to FIG. 15, after step S2 shown in FIG. 14, the determining means 114 uses the method described above to propagate radio wave characteristic 1 (propagation characteristic k1 shown in FIG. 8) between the base station 1 and the terminal device 2. ) Is acquired (step S31).

Then, the determining means 14 acquires the radio wave propagation characteristic 2 in which the frequency of the radio wave propagation characteristic 1 is changed to the shared frequency (step S32).

Then, the determination means 114 determines whether or not the primary user S is recognized (step S33). More specifically, when the determination means 114 refers to the table TBL-1 stored in the storage means 112 and the identification information of the primary user is stored in the column of the primary user ID, It is determined that the primary user S is recognized, and when the identification information of the primary user is not stored in the field of the primary user ID, it is determined that the primary user S is not recognized. When it is determined in step S33 that the primary user S is not recognized, the determination means 114 determines that the range d _{ARV_j'_MAX} of the radio wave from the terminal device 2 is the secondary user (base) by the method described above. The terminal transmission permission area TALWRG is determined so as to be within the range COVG2 of the radio wave of the station 1) (step S34).

On the other hand, when it is determined in step S33 that the primary user S is recognized, the determination means 114 determines that the range d _{ARV_j'_MAX} of the radio wave from the terminal device 2 is the primary user by the method described above. The terminal transmission permission area TALWRG is determined so as to be outside the range COVG1 of the radio wave of (step S35).

Then, after step S34 or step S35, the operation of the communication arbitration device 11 shifts to step S4 shown in FIG.

As described above, the determining means 114 acquires the radio wave propagation characteristic 1 in the radio wave propagation model suitable for the communication environment between the base station 1 and the terminal device 2, and the shared frequency is based on the acquired radio wave propagation characteristic 1. Acquires the radio wave propagation characteristic 2 in (see steps S31 and S32). Then, in the determining means 114, the range d _{ARV_j'_MAX} of the radio wave obtained based on the radio wave propagation characteristic 2 is within the range of the radio wave of the secondary user (base station 1) within the COVG2 or of the radio wave of the primary user. The terminal transmission permission area TALWRG is determined so as to be outside the reach range COVG1 (see steps S34 and S35). Therefore, the terminal transmission permission area TALWRG can be determined according to the communication environment between the base station 1 and the terminal device 2. That is, the terminal transmission permission area TALWRG can be accurately determined.

FIG. 16 is a flowchart for explaining the detailed operation of step S34 shown in FIG. With reference to FIG. 16, when it is determined in step S33 of FIG. 15 that the primary user S is not recognized, the determination means 114 sets i = 1 (step S341), and the terminal device i The position information [x _i , y _i ] and the transmission power Pt _i are read from the storage means 112. Further, the determination means 114 reads the position information [x _G , y _G ] of the base station 1 from the storage means 112.

Then, the determining means 114 uses the method described above to indicate the reachable distance d _{ARV_j} (j is an integer satisfying 1 to J) of the radio wave transmitted from the terminal device 2_i for all the transmission powers Pt _i , and J is the transmission. The total number of electric powers Pt _i ) is acquired (step S342). That is, the determining means 114 acquires the radio wave reach distance d _{ARV_j} by using the radio wave propagation characteristic 2.

After that, the determining means 114 calculates the distance _dbt between the base station 1 and the terminal device 2_i based on the position information [x _i , y _i ], [x _G , y _G ] (step S343).

Subsequently, the determining means 114 sets j = 1 (step S344), and whether or not _{d ARV_j} ≧ dbt (that is, whether or not the radio wave from the terminal device 2 reaches the base station 1). ) Is determined (step S345).

When it is determined in step S345 that _{d ARV_j} ≧ dbt, the determining means 14 discards the radio wave reach distance d _{ARV_j} (step S346) and determines whether or not j = J (step). S347).

When it is determined in step S347 that j = J, the determination means 114 stops the transmission of the terminal device 2_i (step S348) and generates the stop signal STOP_2_i. After that, the series of operations proceeds to step S354.

On the other hand, when it is determined in step S347 that j = J, the series of operations shifts to step S353.

On the other hand, when it is determined in step S345 that _{d ARV_j} ≧ d bt, the determining means 114 is whether or not d _{bt + d ARV_j ≦} R _COVG2 (that is, the radio wave from the terminal device 2_i). Whether or not the reach range is within the reach range R _COVG 2 of the radio wave of the base station 1) is further determined (step S349).

When it is determined in step S349 that d _{bt + d ARV_j ≤} R _COVG2 is not satisfied, the determining means 114 discards the radio wave reach distance d _{ARV_j} (step S350).

On the other hand, when it is determined in step S349 that _dbt + d _{ARV_j} ≤ R _COVG2 , the determining means 114 holds the radio wave reach distance d _{ARV_j} (step S351).

Then, after step S350 or step S351, the determining means 114 determines whether or not j = J (step S352).

When it is determined in step S347 or step S352 that j = J is not satisfied, the determining means 114 sets j = j + 1 (step S353).

After that, the series of operations proceeds to step S345, and steps S345 to S353 are repeatedly executed until it is determined in step S347 or step S352 that j = J.

Then, after step S348 or when it is determined in step S352 that j = J, the determining means 114 is i = I (i is an integer satisfying 1 to I, I is the total number of terminal devices 2). (Step S354).

When it is determined in step S354 that i = I, the determining means 114 sets i = i + 1 (step S355).

After that, the series of operations proceeds to step S342, and steps S342 to S355 are repeatedly executed until it is determined in step S354 that i = I.

Then, when it is determined in step S354 that i = I, the determining means 114 satisfies the maximum distance d _{ARV_j'_max} (j'is 1 ≦ j'≦ J among the held distances d _{ARV_j} . The process of detecting (integer) is executed for all of the I terminal devices 2_1 to 2_I, and the maximum value of the I distances d _{ARV_j'_max} _2_1 to d _{ARV_j'_max} _2_I with respect to the I terminal devices 2_1 to 2_I. d _{ARV_j'_MAX} is detected (step S356).

After that, the determination means 114 determines the terminal transmission permission area TALWRG centered on the position of the base station 1 and surrounded by a circle having the distance between the terminal device 2 having the maximum value d _{ARV_j'_MAX} and the base station 1 as a radius. (Step S357). Then, the series of operations proceeds to step S4 shown in FIG.

When it is determined in step S347 that j = J, the transmission of the terminal device 2_i is stopped (see step S348) because the radio wave from the terminal device 2_i is generated for all the transmission power Pt _i of the terminal device 2_i. This is because it is determined that the base station 1 is not reached.

FIG. 17 is a flowchart for explaining the detailed operation of step S35 shown in FIG. The flowchart shown in FIG. 17 is the same as the flowchart shown in FIG. 16 except that steps S349 to S351 of the flowchart shown in FIG. 16 are replaced with steps S371 to S376.

With reference to FIG. 17, when it is determined in step S33 shown in FIG. 15 that the primary user has been recognized, the above-mentioned steps S341 to S348 are sequentially executed.

Then, if it is determined in step S345 that _{d ARV_j} ≧ dbt, the determining means 114 determines whether or not there is interference with the primary user (step S371). More specifically, in the determination means 114, the distance dS _-b between the primary user S and the base station 1 is the radius R COVG1 of the radio wave reachable range _COVG1 and the radius R _COVG2 of the radio wave reachable range COVG2. When it is larger than the sum, it is determined that there is no interference with the primary user, and the distance dS _-b is less than or equal to the sum of the radius R _COVG1 of the radio wave reachable range COVG1 and the radius R _COVG2 of the radio wave reachable range COVG2. At one point, it is determined that there is interference with the primary user.

When it is determined in step S371 that there is no interference with the primary user, the determining means 114 establishes (dSb _- R _COVG1 )> ( _dbt + d _{ARV_j} )> R _COVG2 . (Step S372).

When it is determined in step S372 that (dSb _- R _COVG1 )> ( _dbt + d _{ARV_j} )> R _COVG2b does not hold, the determination means 114 discards the distance d _{ARV_j} (step S373).

On the other hand, when it is determined in step S372 that (dSb _- R _COVG1 )> ( _dbt + d _{ARV_j} )> R _COVG2 is established, the determination means 114 holds the distance d _{ARV_j} (step S374). ..

On the other hand, when it is determined in step S371 that there is interference with the primary user, the determining means 114 holds (dbt + d _{ARV_j} ) <( _{dSb- R COVG1} ) <R _COVG2 . Whether or not it is determined (step S375).

When it is determined in step S375 that (d bt + d _{ARV_j} ) <(d _{S-b- R COVG1} ) <R _COVG2 does not hold, the series of operations proceeds to step S373.

On the other hand, when it is determined in step S375 that (d bt + d _{ARV_j} ) <(d _{S-b- R COVG1} ) <R _COVG2 is established, the determination means 114 holds the distance d _{ARV_j} (step S376). ..

Then, after any one of step S373, step S374, and step S376, the series of operations shifts to step S352.

After that, in step S347 or step S352, steps S345 to S347, S371 to S376, S352 and S353 are repeatedly executed until it is determined that j = J.

Then, when it is determined in step S347 or step S352 that j = J, steps S342 to S348, S371 to S376, and S352 to S355 are repeatedly executed until it is determined in step S354 that i = I. Will be done.

After that, when it is determined in step S354 that i = I, the above-mentioned steps S356 and S357 are sequentially executed, and the series of operations shifts to step S4 shown in FIG.

FIG. 18 is a flowchart for explaining the operation of the terminal device 2. With reference to FIG. 18, when the operation of the terminal device 2 is started, the receiving means 22 of the terminal device 2 receives the communication condition CMCD from the base station 1 (communication arbitration device 11) via the antenna 21 (step). S21), the received communication condition CMCD is stored in the storage means 23.

The control means 25 reads the communication condition CMCD stored in the storage means 23, refers to the read communication condition CMCD, and whether or not the stop signal STOP is set for the terminal device 2 on which the control means 25 is mounted. Is determined (step S22).

When it is determined in step S22 that the stop signal STOP is set, the control means 25 stops the transmission of radio waves (step S23).

On the other hand, when it is determined in step S22 that the stop signal STOP is not set, the control means 25 radio waves with the base station 1 and / or another terminal device 2 at a shared frequency according to the communication permission content of the communication condition CMCD. And / or receive (step S24).

Then, after step S23 or step S24, the operation of the terminal device 2 ends.

In this way, the terminal device 2 receives the communication condition CMCD from the communication arbitration device 11. This communication condition CMCD is determined based on the terminal transmission permission area TALWRG (see step S4 in FIG. 14). Then, the terminal device 2 transmits and / or receives the radio wave according to the communication permission content of the received communication condition CMCD. This communication permission content is one of "00", "01", "10", "11" and "stop radio wave transmission" for the communication content of the terminal device 2 so as not to interfere with the primary user. (See FIGS. 12 and 13). Therefore, the terminal device 2 can transmit and / or receive radio waves while avoiding interference with the primary user S.

In the embodiment of the present invention, the operation of the communication arbitration device 11 may be executed by software. In this case, the communication arbitration device 11 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory).

The ROM stores a program Prog_A including the flowchart shown in FIG. 14 (including the flowchart shown in FIGS. 15 to 17). Then, the CPU reads the program Prog_A from the ROM, executes the read program Prog_A to determine the terminal transmission permission area TALWRG, and determines the communication condition CMCD generated based on the determined terminal transmission permission area TALWRG. Send to 2. The RAM temporarily stores the radii R _COVG1 , R _{COVG 2} , distances dS _{- b} , dbt, d _{ARV_j} , d _{ARV_j'} , d _{ARV_j'_max} , d _{ARV_j'_MAX} , received power RSSI _i , and the like.

Further, the program Prog_A may be recorded on a recording medium such as a CD or DVD and distributed. In this case, the CPU reads the program Prog_A from the mounted recording medium, executes the read program Prog_A to determine the terminal transmission permission area TALWRG, and the communication generated based on the determined terminal transmission permission area TALWRG. Condition CMCD is transmitted to the terminal device 2. Therefore, the recording medium such as a CD or DVD on which the program Prog_A is recorded is a recording medium that can be read by a computer (CPU).

Further, in the embodiment of the present invention, the operation of the terminal device 2 may be executed by software. In this case, the terminal device 2 includes a CPU, a ROM, and a RAM.

The ROM stores a program Prog_B consisting of the flowchart shown in FIG. Then, the CPU reads the program Prog_B from the ROM and executes it, and transmits and / or receives radio waves to and / or receives radio waves from the base station and / or other terminal devices at a shared frequency according to the communication permission content, or stops the transmission of radio waves.

Further, the program Prog_B may be recorded on a recording medium such as a CD or DVD and distributed. In this case, the CPU reads and executes the program Prog_B from the mounted recording medium, and transmits and / or receives radio waves to and / or receives radio waves with the base station and / or other terminal devices at a shared frequency according to the communication permission contents, or transmits radio waves. To stop. Therefore, the recording medium such as a CD or DVD on which the program Prog_B is recorded is a recording medium that can be read by a computer (CPU).

FIG. 19 is a schematic diagram showing a data structure according to an embodiment of the present invention. With reference to FIG. 19, the data structure D-STR1 according to the embodiment of the present invention includes the base station ID, the position information of the base station, the transmission antenna gain of the base station, the transmission power of the base station, and the terminal device. The ID, the position information of the terminal device, the received power of the terminal device, and the transmission power of the terminal device are included.

Base station ID, base station position information, base station transmission antenna gain, base station transmission power, terminal device ID, terminal device position information, terminal device reception power, and terminal device transmission power are associated with each other. Will be.

The base station ID consists of ID _b , the position information of the base station consists of [x _b , y _b ], the transmission antenna gain of the base station consists of g _b , and the transmission power of the base station consists of Pt _b . Become.

The terminal device ID consists of ID2_1 to ID2_I, and the position information of the terminal device is [x ₁ , y ₁ ], [x ₂ , y ₂ ], [x ₃ , y ₃ ], ..., [x _I , It consists of y _I ].

The received power of the terminal device is composed of RSSI ₁ to RSSI _I , and the transmitted power of the terminal device is composed of Pt ₁ to Pt _I. Each of Pt ₁ to Pt _I comprises at least one transmission power.

The determination means 114 of the communication arbitration device 11 creates a data structure D-STR1 based on the terminal information INFO_i and the base station information INFO_b, and stores the created data structure D-STR1 in the storage means 112.

In the data structure D-STR1, the position information [x _i , y _i ] of the terminal device and the received power RSSI _i of the terminal device are the positions of the primary user S (position information [x]) by the estimation means 113 according to the equation (1). It is used to estimate the position indicated by _G , _yG ]. Then, the received power RSSIi_low which is equal to or less than the set value of the received power RSSI _i of the terminal device and the position information [x _G , y _G ] are the range COVG 1 (= radius) of the radio wave of the primary user by the estimation means 113. It is used to estimate R _COVG1 ).

Further, the transmission power Pt _b of the base station, the transmission antenna gain g _b of the base station, and the reception power RSSI _i of the terminal device are such that the estimation means 113 reaches the radio wave range COVG2 (= radius) of the base station 1 (secondary user). It is used to estimate R _{COVG 2} ). Then, the transmitted power Pt _i of the terminal device and the received power RSSI _i used for estimating the range COVG 2 of the radio wave are the radio waves transmitted from the terminal device 2 by the determining means 114 using the equation (4). It is used to obtain the reach distance d _{ARV_j} of.

Further, in the position information [x _i , y _i ] of the terminal device and the position information [x _b , y _b ] of the base station, the determining means 114 obtains the distance _dbt between the base station 1 and the terminal device 2. Used for. Further, in the position information [x _G , y _G ] and the position information [x _b , y _b ] of the base station, the determination means 114 is the distance d between the primary user and the base station 1 (secondary user). It is used to obtain _Sb .

The range COVG1, COVG2 of the radio wave, the range _{d ARV_j} of the radio wave, and the distances dSb, _dbt are used by the determining means 114 to determine the terminal transmission permission area TALWRG, and the terminal transmission permission is permitted. The region TALWRG is used to generate communication conditions for the terminal device 2 in which the determination means 114 does not interfere with the primary user S.

FIG. 20 is a schematic diagram showing another data structure according to an embodiment of the present invention. The data structure according to the embodiment of the present invention may be the data structure D-STR2 shown in FIG. With reference to FIG. 20, the data structure D-STR2 has a primary user ID, a transmission power of the primary user, a base station ID, a base station position information, and a base station transmission antenna gain. It includes the transmission power of the base station, the terminal device ID, the position information of the terminal device, the reception power of the terminal device, and the transmission power of the terminal device.

Primary user ID, primary user transmission power, base station ID, base station position information, base station transmission antenna gain, base station transmission power, terminal device ID, terminal device position information, terminal device The received power and the transmitted power of the terminal device are associated with each other.

The primary user ID consists of ID1_1 to ID1_P (P is a positive integer). The transmission power of the primary user consists of _{PT 1-11 to PT 1_P} . PT 1-11 to _{PT 1_P} are associated with ID1-1_to ID1_P, respectively.

The base station ID, the position information of the base station, the transmission antenna gain of the base station, the transmission power of the base station, the terminal device ID, the position information of the terminal device, the reception power of the terminal device, and the transmission power of the terminal device are shown in FIG. As explained.

In the data structure D-STR2, the position information [x _i , y _i ] of the terminal device and the received power RSSI _i of the terminal device are the positions of the primary user S (position information [x]) by the estimation means 113 according to the equation (1). It is used to estimate the position indicated by _G , _yG ].

The transmission power _PT 1_p (p is an integer satisfying 1 ≦ p ≦ P) of the primary user and the reception power RSSI _i of the terminal device are the arrival of the radio wave of the primary user by the estimation means 113 according to the equation (2). It is used to estimate the range COVG1 (the range whose radius is _dprimary ).

Further, the transmission power Pt _b of the base station, the transmission antenna gain g _b of the base station, and the reception power RSSI _i of the terminal device are such that the estimation means 113 reaches the radio wave range COVG2 (= radius) of the base station 1 (secondary user). It is used to estimate R _{COVG 2} ). Then, the transmitted power Pt _i of the terminal device and the received power RSSI _i used for estimating the range COVG 2 of the radio wave are the radio waves transmitted from the terminal device 2 by the determining means 114 using the equation (4). It is used to obtain the reach distance d _{ARV_j} of.

Further, in the position information [x _i , y _i ] of the terminal device and the position information [x _b , y _b ] of the base station, the determining means 114 obtains the distance _dbt between the base station 1 and the terminal device 2. Used for. Further, in the position information [x _G , y _G ] and the position information [x _b , y _b ] of the base station, the determination means 114 is the distance d between the primary user and the base station 1 (secondary user). It is used to obtain _Sb .

The range COVG1, COVG2 of the radio wave, the range _{d ARV_j} of the radio wave, and the distances dSb, _dbt are used by the determining means 114 to determine the terminal transmission permission area TALWRG, and the terminal transmission permission is permitted. The region TALWRG is used to generate communication conditions for the terminal device 2 so that the determination means 114 does not interfere with the primary user S.

In the above, it has been described that the communication arbitration device 11 is arranged in the base station 1, but in the embodiment of the present invention, the communication arbitration device 11 is not limited to this, and the communication arbitration device 11 is located in a place other than the base station 1. It may be arranged. In this case, the communication arbitration device 11 receives the base station information INFO_b and the terminal information INFO_i via a wired cable, or receives the base station information INFO_b and the terminal information INFO_i by wireless communication. Further, the communication arbitration device 11 transmits the communication conditions generated by the above method to the plurality of terminal devices 2 via the wired cable and the base station 1, or by wireless communication via the base station 1 to the plurality of terminal devices. Send to 2.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the embodiments described above, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The present invention applies to communication arbitration devices, terminal devices, programs to be executed by computers, computer-readable recording media and data structures in which the programs are recorded.

1 base station, 2 terminal devices, 10 wireless communication systems, 11 communication arbitrators, 21 antennas, 22,111 receiving means, 23,112 storage means, 24 GPS receivers, 25 control means, 26,115 transmitting means, 113 estimation. Means, 114 Determining Means.

Claims (17)

Based on a plurality of position information indicating the positions of a plurality of terminal devices and a plurality of received powers of the plurality of terminal devices, the first radio wave reach range, which is the reach range of the radio wave transmitted from the primary user, is estimated. 2. An estimation means for estimating a second radio wave reachable range, which is a range of radio waves transmitted from the base station, based on the transmission power of the base station, which is a secondary user.
Based on the plurality of transmission powers in the plurality of terminal devices and the plurality of position information, the reach of the radio wave transmitted from the terminal device includes the position of the base station and is outside the reach of the first radio wave or. Terminal transmission permission, which is an area within the reach of the second radio wave and is an area where the terminal device is permitted to transmit radio waves on a shared frequency shared by the primary user and the base station. Determining means to determine the area and
A generation means for generating communication conditions of the plurality of terminal devices that do not interfere with the primary user based on the terminal transmission permission area determined by the determination means.
A communication arbitration device including a transmission means for transmitting communication conditions generated by the generation means to the plurality of terminal devices. The determination means determines the terminal transmission permission area so that the reach of the radio wave transmitted from the terminal device is within the reach of the second radio wave when the primary user is not detected. The communication arbitration device according to 1. The determination means is the terminal device when the primary user existing outside the reach of the second radio wave is detected, or when the radio wave transmitted from the base station interferes with the primary user. The communication arbitration device according to claim 1, wherein the terminal transmission permission area is determined so that the range of the radio wave transmitted from the radio wave is outside the range of the first radio wave. The determination means is a radio wave propagation characteristic in a radio wave propagation model transmitted from the terminal device using a radio wave propagation loss calculated based on the transmission power of the base station and the reception power of the terminal device. In addition to acquiring the propagation characteristic of 1, the second propagation characteristic which is the propagation characteristic of the radio wave when the frequency in the acquired first propagation characteristic is set to the shared frequency is acquired, and the second propagation characteristic is obtained. The communication arbitration device according to any one of claims 1 to 3, wherein the terminal transmission permission area is determined by using the communication arbitration device. The determination means determines the transmission power of the terminal device used for determining the terminal transmission permission area as the transmission power of the terminal device in the terminal transmission permission area.
The communication arbitration device according to claim 4, wherein the generation means generates the communication conditions including the transmission power of the terminal device determined by the determination means. When the radio wave transmitted by the terminal device with the determined transmission power does not reach the base station, the determination means stops the transmission of the radio wave from the terminal device.
The communication arbitration device according to claim 5, wherein the generation means generates the communication condition including a stop signal for stopping the transmission of the radio wave. A receiving means for receiving the communication condition from the communication arbitration device according to any one of claims 1 to 6.
A terminal device comprising a communication means for transmitting and / or receiving radio waves with the base station and / or other terminal device at the shared frequency according to the content of communication permission when the communication condition does not include a stop signal. The terminal device according to claim 7, wherein the communication means stops transmission of radio waves when the communication condition includes the stop signal. A first radio wave reachable range, which is a range of radio waves transmitted from a primary user based on a plurality of position information indicating the positions of a plurality of terminal devices and a plurality of received powers of the plurality of terminal devices. And the first step of estimating the second radio wave reachable range, which is the reachable range of the radio wave transmitted from the base station, based on the transmission power of the base station which is the secondary user.
The determination means includes the position of the base station and the first radio wave within the reach of the radio wave transmitted from the terminal device based on the plurality of transmission powers of the plurality of terminal devices and the plurality of position information. It is an area outside the reach or within the reach of the second radio wave, and the terminal device is permitted to transmit radio waves at a shared frequency shared by the primary user and the plurality of terminal devices. The second step of determining the terminal transmission permission area, which is an area, within the second radio wave reach range, and
A third step in which the generation means generates communication conditions of the plurality of terminal devices that do not interfere with the primary user based on the terminal transmission permission area determined in the second step.
A program for causing a computer to execute a fourth step in which a transmission means transmits the communication conditions generated in the third step to the plurality of terminal devices. When the primary user is not detected in the second step, the determination means permits the terminal transmission so that the reach of the radio wave transmitted from the terminal device is within the reach of the second radio wave. The program for causing the computer according to claim 9 to determine an area. In the second step, the determination means means that when the primary user existing outside the range of the second radio wave is detected, or the radio wave transmitted from the base station is detected with the primary user. The program for causing the computer according to claim 9, which determines the terminal transmission permission area so that the range of the radio wave transmitted from the terminal device is outside the range of the first radio wave in the case of interference. .. The determining means is used in a radio wave propagation model transmitted from the terminal device using the radio wave propagation loss calculated based on the transmission power of the base station and the reception power of the terminal device in the second step. The first propagation characteristic which is the propagation characteristic of the radio wave is acquired, and the second propagation characteristic which is the propagation characteristic of the radio wave when the frequency in the acquired first propagation characteristic is set to the shared frequency is acquired. The program for causing the computer according to any one of claims 9 to 11 to determine the terminal transmission permission area using the second propagation characteristic. In the second step, the determination means determines the transmission power of the terminal device used for determining the terminal transmission permission area as the transmission power of the terminal device in the terminal transmission permission area.
The program for causing the computer according to claim 12, wherein the generation means generates the communication conditions including the transmission power of the terminal device determined in the second step in the third step. .. In the second step, when the radio wave transmitted by the terminal device with the determined transmission power does not reach the base station, the determination means stops the transmission of the radio wave from the terminal device.
The program for causing the computer according to claim 13, wherein the generation means generates the communication conditions including a stop signal for stopping the transmission of the radio waves in the third step. The first step in which the receiving means receives the communication condition from the communication arbitration device according to any one of claims 1 to 6.
When the communication condition does not include a stop signal, the communication means performs a second step of transmitting and / or receiving radio waves with the base station and / or other terminal device at the shared frequency according to the communication permission content. Program to be executed by. The program for causing the computer according to claim 15, wherein the communication means stops the transmission of radio waves when the communication condition includes the stop signal in the second step. A computer-readable recording medium on which the program according to any one of claims 9 to 16 is recorded.

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