JP6810664B2 - Communication systems, base stations, control devices and control methods - Google Patents

Description

The present invention relates to communication systems, base stations, control devices and control methods.

As a communication system, for example, a technique of a municipal digital disaster prevention broadcast communication system has been proposed (see, for example, Non-Patent Document 1).

By the way, when a new communication system for wireless communication in a nearby frequency band is installed in the vicinity of an existing communication system such as a municipal digital disaster prevention broadcast communication system, the influence of interference or the like on the communication of the existing communication system is affected. In addition, the communication quality of the existing communication system is deteriorated.

Therefore, the newly installed communication system reduces the transmission power of the communication at the timing when the existing communication system communicates, thereby reducing the interference with the existing communication system, and the existing communication system and the new communication system. A technique for dynamic transmission power control that suppresses deterioration of communication quality of a communication system has been proposed (see, for example, Non-Patent Document 2).

"Municipal Digital Disaster Prevention Broadcast Communication System Standard ARIB STD-T86 3.0 Version", Association of Radio Industries and Businesses (2007) C. Gandarillas, et al., "Dynamic transmit-power control for WiFi access points based on wireless link occupancy", in Proc. IEEE WCNC 2014, pp.1093-1098, 2014.

In order to execute dynamic transmission power control and the like, it is necessary to know in advance the position of the base station, the communication frequency, the transmission timing, etc. in the existing communication system. However, it is difficult to obtain system information such as the position of a base station of an existing communication system in advance.

An object of the present invention is to provide a communication system, a base station, a control device, and a control method capable of suppressing the occurrence of interference with an existing communication system without obtaining information on the existing communication system in advance. ..

The first invention includes a plurality of pair of base stations for transmitting and receiving a first signal including data facing each other, and a control device for controlling each of the plurality of pair of base stations, and the plurality of pair of base stations. Each of the transmitters transmitting the first signal to the opposing base station, the first signal from the opposing base station, and the first in at least one other system different from the plurality of pairs of base stations. Based on the receiving unit that receives the second signal, the notification unit that notifies the control device of the reception information indicating the second signal in the other received system, and the control information from the control device, the first signal The control device includes a control unit that controls transmission power, and the control device includes a reception unit that receives reception information of another system from each of a plurality of pairs of base stations, and another system uses the reception information to receive a second signal. A calculation unit that calculates the position and timing of the antenna that transmits the first signal, a determination unit that determines the frequency band in which each of the plurality of pairs of base stations transmits the first signal using the received information, and other calculated systems. A communication system including a notification unit for notifying each of a plurality of pair of base stations of control information indicating a position and timing of an antenna in the above and a frequency band in each of the determined pair of base stations. Is.

According to the second invention, in the first invention, when the second signal is not transmitted at the timing of transmitting the first signal, the control unit sends the first signal to the transmission unit with the first transmission power. When the second signal is transmitted at the timing of transmitting and transmitting the first signal, the transmission unit is made to transmit the first signal with a second transmission power smaller than the first transmission power. To do.

According to a third aspect of the invention, in the first invention, when the first signal includes a plurality of subcarriers and the second signal is transmitted at the timing of transmitting the first signal, a plurality of control units are used. It is characterized in that the transmission power of the subcarrier adjacent to the second signal among the subcarriers is made smaller than the transmission power of the other subcarriers so that the transmission unit transmits the first signal.

A fourth aspect of the present invention is, in any one of the first invention to the third aspect, the calculation unit selects three base stations from a plurality of pair of base stations, and another base station from the selected three base stations. It is characterized in that the position and timing of the antenna in another system are calculated using the received information of the system.

A fifth invention comprises a transmitting unit that transmits a first signal containing data to an opposing base station, a first signal from the opposing base station, and at least one other signal that is different from the opposing base station. Based on the receiving unit that receives the second signal in the system, the notification unit that notifies the external control device of the received information indicating the second signal in the other received system, and the control information from the control device. It is a base station characterized by including a control unit for controlling the transmission power of the first signal.

A sixth invention is a control device that controls each of a plurality of pairs of base stations that transmit and receive a first signal containing data so as to face each other, and the plurality of pairs received by each of the plurality of pairs of base stations. A receiver that receives reception information indicating a second signal in at least one other system different from the base station of the above from each of a plurality of pairs of base stations, and another system using the reception information to receive the second signal. A calculation unit that calculates the position and timing of the antenna that transmits the first signal, a determination unit that determines the frequency band in which each of the plurality of pairs of base stations transmits the first signal using the received information, and other calculated systems. A control device including a notification unit for notifying each of a plurality of pair of base stations of control information indicating the position and timing of the antenna in the above and the frequency band in each of the determined pair of base stations. Is.

A seventh invention is a control method for a communication system including a plurality of pair of base stations for transmitting and receiving a first signal including data facing each other and a control device for controlling each of the plurality of pair of base stations. , Each of the plurality of pairs of base stations transmits a first signal to the opposing base stations, and each of the plurality of pairs of base stations includes a first signal from the opposing base stations and a plurality of. A second signal in at least one other system different from the pair of base stations is received, and each of the plurality of pairs of base stations receives received information indicating the second signal in the other received system to the control device. Notifying, the controller receives the received information of the other system from each of the pair of base stations, and the controller uses the received information to position the antenna and the position of the antenna to which the other system transmits the second signal. The timing is calculated, the control device uses the received information to determine the frequency band in which each of the pair of base stations transmits the first signal, and the control device determines the position of the antenna and the calculated position of the antenna in the other system. Control information indicating the timing and the frequency band in each of the determined pair of base stations is notified to each of the pair of base stations, and each of the pair of base stations has control information from the control device. This is a control method characterized in that the transmission power of the first signal is controlled based on the above.

INDUSTRIAL APPLICABILITY The present invention can suppress the occurrence of interference with an existing communication system without obtaining information on the existing communication system in advance.

It is a figure which shows one Embodiment of a communication system. It is a figure which shows an example of the base station and the control device shown in FIG. It is a figure which shows an example of the frequency band between the communication system shown in FIG. 1 and another system. It is a figure which shows an example of the control process of the transmission power in the base station shown in FIG. It is a figure which shows an example of the control process in the communication system shown in FIG.

Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 shows an embodiment of a communication system.

The communication system SYS shown in FIG. 1 has four base stations BS (BS (1) -BS (4)) and a control device CL. The base station BS (1) and the base station BS (2), and the base station BS (3) and the base station BS (4) are installed facing each other. Then, the base stations BS (1) and BS (2) are transmission targets including voice and the like based on a communication standard such as LTE (Long Term Evolution) instead of a physical line such as a telephone line. Signal sig1 having a plurality of subcarriers to which data is assigned is transmitted to and received from each other in the same frequency band. Further, the base stations BS (3) and BS (4) provide signal sig3 having a plurality of subcarriers to which data to be transmitted including voice and the like is assigned based on a communication standard such as LTE. Send and receive to each other in the same frequency band different from. That is, the base stations BS (1) -BS (4) are used in rural areas and areas where it is difficult for telecommunications carriers to accommodate subscriber communication devices such as fixed telephones by wire from the station building. Arranged to realize extended wireless access. The signals sig1 and sig3 are examples of the first signal.

The base station BS may be, for example, an access point, a cellular base station, or the like, and may wirelessly communicate with a plurality of mobile communication terminals such as smartphones in cells under each base station BS. Further, the communication system SYS may have three or more pairs of base station BSs that communicate wirelessly with each other. The operation of the base station BS will be described with reference to FIG.

The control device CL is, for example, a computer device having an arithmetic processing device such as a processor and a storage device such as a hard disk device. The control device CL is connected to the base station BS (1) and the base station BS (3) via, for example, a network NW, and controls the operation of the base stations BS (1) -BS (4). The operation of the control device CL will be described with reference to FIGS. 2 to 5.

The control device CL has a wireless communication function, and operates the base stations BS (1) -BS (4) by directly communicating with each of the base stations BS (1) -BS (4). You may control it.

Further, as shown in FIG. 1, the communication system SYS is installed in an area where an existing communication system (hereinafter, also referred to as “other system”) such as a municipal digital disaster prevention broadcast communication system is installed. That is, in FIG. 1, the communication system SYS is installed in an area in which three other systems OSY (OSY (1) -OSY (3)) are installed, each of which has a circular area indicated by a broken line as a range of wireless communication. To. Each of the other systems OSY has a base station OB (OB (1) -OB (3)), and wirelessly communicates in a frequency band different from each other and in a frequency band different from the signals sig1 and sig3.

In addition, one or more other system OSYs may be arranged. Further, the wireless communication ranges of the other systems OSY shown by the broken lines do not have to overlap each other.

FIG. 2 shows an example of the base station BS (1) and the control device CL shown in FIG. The base station BS (2) -BS (4) has the same elements as the base station BS (1), and detailed description thereof will be omitted.

The base station BS (1) has an IF (Interface) unit 10, a modulation unit 20, a transmission / reception unit 30, an antenna AT1, a demodulation unit 40, and a control unit 50.

The IF unit 10 is, for example, an input / output interface or a network interface, and when connected to the network NW, the IF unit 10 transmits / receives data to / from the network NW. Further, when the IF unit 10 is connected to a subscriber's communication device such as one or a plurality of fixed telephones using a line such as a telephone line, the IF unit 10 transmits / receives data such as voice to / from the communication device. Then, the IF unit 10 outputs the data received from the network NW or the communication device to the modulation unit 20.

The IF unit 10 of the base stations BS (1) and BS (3) transmits / receives data to / from the control device CL via the network NW. In this case, the IF unit 10 outputs the received data from the control device CL to the control unit 50.

Further, the IF unit 10 may have an error correction coding function and an interleaving function for the data transmitted to the base station BS (2). Further, the IF unit 10 may have an error correction / decoding function or a deinterleave function for the data received from the base station BS (2).

For example, the modulation unit 20 performs modulation processing such as QPSK (Quadrature Phase Shift Keying) or 64QAM (Quadrature Amplitude Modulation) on the data assigned to each of the N subcarriers based on the control instruction of the control unit 50. Execute.

Further, the modulation unit 20 sets the transmission power of N subcarriers based on the control instruction of the control unit 50 in order to suppress the influence of interference or the like on the wireless communication of the other system OSY. For example, when the other system OSY does not transmit the communication signal at the timing of transmitting the signal sig1, the modulation unit 20 sets the transmission power of N subcarriers to a predetermined power based on the control instruction of the control unit 50. Set. On the other hand, when another system OSY is transmitting a communication signal at the timing of transmitting the signal sig1, the modulation unit 20 sets the transmission power of N subcarriers from a predetermined power based on the control instruction of the control unit 50. Set to low power. Alternatively, the modulation unit 20 transmits the transmission power of the subcarrier closest to the frequency band of the other system OSY adjacent to the frequency band of the signal sig1 transmitted by the base station BS (1) among the N subcarriers. It may be smaller than the transmission power of the subcarrier.

Then, the modulation unit 20 executes the secondary modulation of OFDM (Orthogonal Frequency Division Multiplex) for each subcarrier including the primary modulated data to generate a data signal. The modulation unit 20 outputs the generated data signal to the transmission / reception unit 30.

It is preferable that the modulation unit 20 adds modulation information indicating the content of primary modulation to the data assigned to each subcarrier to each subcarrier. As a result, the base station BS (1) can notify the base station BS (2) of the primary modulation executed for the data of each subcarrier. Then, the base station BS (2) can demodulate the data assigned to each subcarrier based on the added modulation information.

The transmission / reception unit 30 executes a process such as frequency conversion on the data signal received from the modulation unit 20 for transmission from the antenna AT1 and the like to generate the signal sig1. The transmission / reception unit 30 transmits the generated signal sig1 to the base station BS (2). On the other hand, the transmission / reception unit 30 receives the signal sig1 from the base station BS (2), executes processing such as frequency conversion on the received signal sig1, and transmits the data signal subjected to frequency conversion or the like to the demodulation unit 40. Output.

Further, the transmission / reception unit 30 has a function of sweeping the frequency of the received signal, receiving the communication signal of another system OSY, and measuring the frequency band of the received communication signal, for example, based on the control instruction from the control device CL. Has. Further, the transmission / reception unit 30 has a function of measuring the reception time of receiving the communication signal of the other system OSY, for example, based on the time output from the clock circuit included in the base station BS1. The transmission / reception unit 30 outputs the frequency band and reception time of the measured communication signal of each other system OSY to the control unit 50. The process of measuring the frequency band and reception time of the communication signal of the other system OSY by the transmission / reception unit 30 may be executed before the start of operation of the communication system SYS, and may be executed at a predetermined time interval (for example, half a year or one year, etc.). ) May be executed every time. The communication signal of the other system OSY is an example of the second signal.

The demodulation unit 40 executes OFDM demodulation processing on the data signal received from the transmission / reception unit 30, and acquires modulation information added to each demodulated subcarrier. The demodulation unit 40 executes demodulation processing on the data included in each subcarrier based on the acquired modulation information, and acquires the data. Then, the demodulation unit 40 outputs the acquired data to the IF unit 10 or the control unit 50.

The control unit 50 is a processor or the like, and controls each element of the base station BS1 by executing a program stored in a storage device such as a memory included in the base station BS1. For example, the control unit 50 executes dynamic transmission power control or the like based on a control instruction from the control device CL to control the transmission power of the signal sig1. The operation of the control unit 50 will be described with reference to FIGS. 4 and 5.

Further, the control unit 50 operates as the notification unit 60 by executing the program. For example, the notification unit 60 receives from the transmission / reception unit 30 a signal indicating the frequency band and reception time of the communication signal in each of the other system OSYs measured by the transmission / reception unit 30. Then, the notification unit 60 notifies the control device CL via the IF unit 10 of the frequency band and the reception time of the communication signal in each of the received other system OSYs as reception information.

The notification unit 60 of the base station BS (2) and the base station BS (4) receives the reception information including the frequency band and the reception time of the communication signal in each of the other system OSYs in the base station BS (1) or the base station. Notify the control device CL via the BS (3). In this case, in the base station BS (2) and the base station BS (4), the notification unit 60 outputs the received information to the modulation unit 20 as data, and the transmission / reception unit 30 outputs the signal sig1 including the received information to the base station BS. (1) and the signal sig3 are transmitted to the base station BS (3).

Further, in the base station BS (1) and the base station BS (3), the notification unit 60 outputs the control instruction from the control device CL as data to the modulation unit 20, and the transmission / reception unit 30 outputs the control instruction of the control device CL. The signal sig1 including the above is transmitted to the base station BS (2), and the signal sig3 is transmitted to the base station BS (4).

The base station BS (2) and the base station BS (4) may be connected to the network NW via the IF unit 10. In this case, the notification unit 60 of the base station BS (2) and the base station BS (4) directly notifies the control device CL of the reception information including the frequency band and the reception time of the measured communication signal of the other system OSY.

The control device CL is a computer device or the like, and has an IF unit 110 and a control unit 120.

The IF unit 110 is, for example, a network interface or the like, and is connected to the network NW. For example, the IF unit 110 transmits data such as reception information including the frequency band and reception time of the communication signal in the other system OSY measured by each base station BS to the base station BS (1) and the base via the network NW. Received from station BS (3). Then, the IF unit 110 outputs the received data to the control unit 120. Further, the IF unit 110 outputs data such as a control instruction by the control unit 120 to the base station BS (1) or the base station BS (3) via the network NW.

The control unit 120 is a processor or the like, and controls each element of the control device CL by executing a program stored in the storage device of the control device CL. Further, the control unit 120 functions as the calculation unit 130 and the determination unit 140 by executing the program.

The calculation unit 130 calculates the position and transmission timing of the base station OB that transmits the communication signal in the other system OSY by using the reception information of each of the other system OSYs received from each base station BS. For example, the calculation unit 130 uses the principle of triangulation to calculate at least three of the base station BSs that have measured the reception information of the other system OSY in order to calculate the position and transmission timing of the base station OB of the other system OSY. Select the base station BS. Then, the calculation unit 130 uses the reception time included in the reception information of the three selected base station BSs and the equations (1) to (3) to display the position and communication signal of the base station OB of the other system OSY. The transmission timing of is calculated.

Here, c indicates the speed of light. (X _n , y _n ) indicates the position of the base station OB (n) of the other system OSY (n), and t _n is the communication signal transmitted by the base station OB (n) of the other system OSY (n). Indicates the transmission timing (n is an integer from 1 to 3). _{(X A, Y A),} (X B, Y B), (X C, Y C) indicates the position of the three base stations BS _{selected, T A, T B, T} C was selected 3 Indicates the reception time when the communication signal of the other system OSY (n) is received in one base station BS. That is, it is preferable that the control device CL stores the position data of each base station BS in advance in the storage device of the control device CL. The position of the base station OB is an example of the position of the antenna.

The determination unit 140 determines the frequency bands of the signal sig1 and the signal sig3 by using the received information. The operation of the determination unit 140 will be described with reference to FIG.

Then, the control unit 120 networks the control information including the calculated position (x _n , y _n ) of the base station OB of the other system OSY (n), the transmission timing t _{n of the} communication signal, and the determined frequency band. Notify each base station BS via the NW. Further, the control unit 120 manages the calculated position (x _n , y _n ) of the base station OB of each other system OSY, the transmission timing t _{n of the} communication signal, and the frequency band acquired from each base station BS. Is stored in the storage device of the control device CL. The control unit 120 is an example of a notification unit.

FIG. 3 shows an example of the frequency band between the communication system SYS shown in FIG. 1 and the other system OSY. FIG. 3A shows an example of the distribution of the frequency band of the other system OSY. FIG. 3B shows an example of the frequency band of each base station BS set by the control device CL shown in FIG. The horizontal axis of FIG. 3 indicates the frequency, and the vertical axis indicates the electric power. Further, in FIG. 3B, each of the signals sig1 and sig3 is shown by N subcarriers SC1-SCN.

As shown in FIG. 3A, the other system OSY (1) has a frequency band from frequency f1 to frequency f2, and the other system OSY (2) has a frequency band from frequency f3 to frequency f4. The other system OSY (3) has a frequency band from frequency f5 to frequency f6. Then, the control device CL acquires the distribution of the frequency band of the other system OSY shown in FIG. 3A based on the received information from each base station BS.

As shown in FIG. 3B, the determination unit 140 of the control device CL determines, for example, the signal sig1 among the frequency bands not used for wireless communication based on the acquired frequency band distribution of the other system OSY. The frequency band is determined from the frequency f21 to the frequency f22. Further, the determination unit 140 determines the frequency band of the signal sig3 from the frequency f41 to the frequency f42. The frequency bands from frequency f2 to frequency f21, frequency f22 to frequency f3, frequency f4 to frequency f41, and frequency f42 to frequency f5 indicate guard bands.

In FIG. 3B, the determination unit 140 is provided with a guard band, but the guard band may not be provided depending on the control processing of the transmission power by the base station BS.

FIG. 4 shows an example of transmission power control processing in the base station BS (1) shown in FIG. FIG. 4A shows an example of the transmission power of the signal sig1 when another system OSY having an adjacent frequency band does not transmit the communication signal. FIG. 4B shows an example of the transmission power of the signal sig1 when at least one other system OSY having adjacent frequency bands is transmitting the communication signal. FIG. 4C shows another example of the transmission power of the signal sig1 when at least one other system OSY having adjacent frequency bands is transmitting the communication signal.

Further, in FIG. 4, in order to show the case where the base station BS (1) controls the transmission power of the signal sig1, among the frequency bands shown in FIG. 3, the other system OSY (1), the signal sig1 and the other system OSY ( The frequency band of 2) is shown. Note that the base station BS (2) controls the transmission power of the signal sig1 as in the case of the base station BS (1), and detailed description thereof will be omitted. Further, the base stations BS (3) and BS (4) control the transmission power of the signal sig3 as in the case of the signal sig1, and detailed description thereof will be omitted.

For example, the control unit 50 of the base station BS (1) refers to the transmission timing of the other system OSY included in the control information from the control device CL, and at the timing of transmitting the signal sig1, the other system OSY having adjacent frequency bands. It is determined whether or not (1) and the other system OSY (2) are transmitting the communication signal. As shown by the broken line in FIG. 4A, the control unit 50 determines the preset transmission power α when the other systems OSY (1) and OSY (2) are not transmitting the communication signal. That is, since the signal sig1 does not affect the other systems OSY (1) and OSY (2) by interference or the like, the control unit 50 determines the transmission power α that can optimize the communication quality of the communication system SYS. Then, the control unit 50 outputs a control instruction for setting the transmission power of the subcarrier SC1-SCN of the signal sig1 to the determined transmission power α to the modulation unit 20 and the transmission / reception unit 30.

On the other hand, when the control unit 50 determines that the other systems OSY (1) and OSY (2) are transmitting the communication signal, as shown by the solid line in FIG. 4B, the control unit 50 performs dynamic transmission power control and the like. Execute and determine the transmission power β that is smaller than the transmission power α. Then, the control unit 50 outputs a control instruction for setting the transmission power of the subcarrier SC1-SCN of the signal sig1 to the determined transmission power β to the modulation unit 20 and the transmission / reception unit 30. As a result, even if the base station BS (1) transmits the signal sig1, the influence of interference or the like on the other systems OSY (1) and OSY (2) can be suppressed, and the communication system SYS and the other system OSY (1) can be suppressed. , Deterioration of communication quality of OSY (2) can be suppressed.

When the control unit 50 determines that the other systems OSY (1) and OSY (2) are transmitting the communication signal, the control unit 50 transmits the transmission power of each of the subcarriers SC1-SCN included in the signal sig1. It is not necessary to control to β. For example, as shown in FIG. 4C, the control unit 50 transmits the transmission power of the subcarriers SC1 and SCN indicated by the broken lines adjacent to the frequency band of the other system OSY (1) or the other system OSY (2). The transmission power γ may be controlled to be smaller than the transmission power α of the subcarrier SC2-SC (N-1). Then, the control unit 50 outputs a control instruction to be set to the transmission power γ of the subcarrier SC1, the SCN, and the transmission power α of the subcarrier SC2-SC (N-1) to the modulation unit 20 and the transmission / reception unit 30.

In this case, by controlling the transmission power of the subcarriers SC1 and SCN to be smaller than that of the subcarrier SC2-SC (N-1), the communication system SYS can suppress interference with another system OSY, and the frequency of the guard band. The band can be set narrower than before. That is, the communication system SYS can improve the frequency utilization efficiency.

Further, when the transmission power of the subcarriers SC1 and SCN is changed from the transmission power α to the transmission power γ, the control unit 50 uses the surplus power obtained by reducing the power consumption of the subcarriers SC1 and SCN in the time domain of the transmission power. You may evenly distribute to the transmission power of the subcarrier SC2-SC (N-1) within the range where the maximum value in is equal to or less than the regulation value. As a result, the communication system SYS can suppress quality deterioration due to the reduction in power consumption of the subcarriers SC1 and SCN.

It is preferable that the values of the transmission powers α, β, and γ are appropriately determined according to the distance between the communication system SYS and the other system OSY, the width of the guard band, and the like. Further, the values of the transmission power β and the transmission power γ may be the same or different from each other. The transmission power α is an example of the first transmission power, and the transmission powers β and γ are examples of the second transmission power.

FIG. 5 shows an example of the control process in the communication system SYS shown in FIG. In the process shown in FIG. 5, the processes from step S100 to step S140 are executed by the base station BS (1). Further, the processes of steps S200 to S230 are executed by the base station BS (2). Further, the processes of steps S300 to S330 are executed by the control device CL. That is, the process shown in FIG. 5 shows an embodiment of the control method.

Of the processes shown in FIG. 5, the processes of steps S100 to S130, steps S200 to S220, and steps S300 to S330 are executed before the start of operation of the communication system SYS. Further, the base stations BS (3) and BS (4) operate in the same manner as the base stations BS (1) and BS (2) shown in FIG. 5, and detailed description thereof will be omitted.

In step S100, the control unit 50 of the base station BS (1) sweeps the frequency and causes the transmission / reception unit 30 to receive the communication signal of the other system OSY, for example, based on the control instruction from the control device CL. The transmission / reception unit 30 measures the frequency band of the received communication signal of the other system OSY. Further, the transmission / reception unit 30 measures the reception time at which the communication signal of the other system OSY is received, based on the time output from the clock circuit of the base station BS (1). The transmission / reception unit 30 outputs a signal including the frequency band and reception time of the measured communication signal of each other system OSY to the control unit 50.

When the notification unit 60 receives the control instruction from the control device CL, it is preferable that the notification unit 60 outputs the received control instruction to the base station BS (2) via the modulation unit 20 and the transmission / reception unit 30.

Next, in step S110, the notification unit 60 receives the reception information including the frequency band and the reception time of the communication signal of the other system OSY measured in step S100 via the IF unit 10 and the network NW, and the control device CL. Notify to. Further, when the notification unit 60 receives the received information from the base station BS (2), the notification unit 60 also notifies the control device CL of the received information from the received base station BS (2).

Next, in step S120, the control unit 50 provides the network NW with control information including the position of the base station OB of each other system OSY calculated by the control device CL, the transmission timing of the communication signal, and the determined frequency band. Received from the control device CL via. The control unit 50 stores the received control information in the storage device of the base station BS (1).

Next, in step S130, the notification unit 60 outputs the control information received in step S120 as data to the modulation unit 20, and transmits the signal sig1 including the control information via the transmission / reception unit 30 and the antenna AT1 to the base station BS (2). ). As a result, the notification unit 60 notifies the base station BS (2) of the control information.

Next, in step S140, the control unit 50 executes dynamic transmission power control or the like based on the control information received in step S120, and the modulation unit 20 and transmission / reception are performed according to the transmission timing of the communication signal in the other system OSY. The transmission power of the signal sig1 in the unit 30 is controlled.

Then, each time the base station BS (1) receives data from the network NW or the communication device of the subscriber, the base station BS (1) controls the transmission power of the signal sig1 and transmits the signal sig1 including the data to the base station BS (2). ..

On the other hand, in step S200, the control unit 50 of the base station BS (2) sweeps the frequency based on the control instruction from the control device CL as in the process of step S100 in the base station BS (1). The transmission / reception unit 30 receives the communication signal of the system OSY. The transmission / reception unit 30 measures the frequency band of the received communication signal of the other system OSY. Further, the transmission / reception unit 30 measures the reception time at which the communication signal of the other system OSY is received, based on the time output from the clock circuit of the base station BS (2). The transmission / reception unit 30 outputs a signal including the frequency band and reception time of the measured communication signal of each other system OSY to the control unit 50.

Next, in step S210, the notification unit 60 informs the modulation unit 20 of the reception information including the frequency band and the reception time of the communication signal of the other system OSY measured in step S200 to the control device CL. Output as data. Then, the transmission / reception unit 30 transmits the signal sig1 including the reception information to the base station BS (1).

Next, in step S220, the transmission / reception unit 30 receives the signal sig1 transmitted by the base station BS (1) in step S130, and outputs the received signal sig1 to the demodulation unit 40. Then, the demodulation unit 40 executes demodulation processing on the received signal sig1 and outputs the control information included in the signal sig1 to the control unit 50. The control unit 50 stores the received control information in the storage device of the base station BS (2).

Next, in step S230, the control unit 50 executes dynamic transmission power control or the like based on the control information received in step S220, and the modulation unit 20 and transmission / reception are performed according to the transmission timing of the communication signal in the other system OSY. The transmission power of the signal sig1 in the unit 30 is controlled.

Then, each time the base station BS (2) receives data from the subscriber's communication device via the IF unit 10, the base station BS (2) controls the transmission power of the signal sig1 and transmits the signal sig1 including the data to the base station BS (1). Send to.

On the other hand, in step S300, the control unit 120 of the control device CL receives the reception information of the other system OSY measured by each of the base station BSs via the network NW and the IF unit 110.

Next, in step S310, the calculation unit 130 calculates the position and transmission timing of the base station OB that transmits the communication signal in the other system OSY by using the reception information of the other system OSY received in step S300. For example, the calculation unit 130 selects at least three base station BSs for which reception information of the other system OSY has been measured in order to calculate the position and transmission timing of the base station OB of the other system OSY. Then, the calculation unit 130 uses the reception time included in the reception information of the three selected base station BSs and the equations (1) to (3) to display the position and communication signal of the base station OB of the other system OSY. The transmission timing of is calculated.

Next, in step S320, the determination unit 140 determines the frequency bands of the signal sig1 and the signal sig3 transmitted by the base station BS using the received information.

Next, in step S330, the control unit 120 networks the control information including the position of the base station OB of each other system OSY calculated in step S310, the transmission timing of the communication signal, and the frequency band determined in step S320. Notify the base station BS (1) and the base station BS (3) via the NW. Further, the control unit 120 stores the calculated position of the base station OB of each other system OSY, the transmission timing of the communication signal, and the received information measured by each base station BS in the storage device of the control device CL as management information. To do. Then, the control device CL ends the process.

Of the processes shown in FIG. 5, the processes of steps S100 to S130, steps S200 to S220, and steps S300 to S330 are executed at predetermined time intervals (for example, half a year or one year). May be good. In this case, the processes of steps S100 to S130, steps S200 to S220, and steps S300 to S330 are preferably executed in parallel with the processes of steps S140 and S230.

As described above, in the embodiment shown in FIGS. 1 to 5, when transmitting data, the communication system SYS causes each of the base station BSs of the communication system SYS to receive the communication signal of the other system OSY, and communicates with the other system OSY. Have the signal frequency band and reception time measured. The communication system SYS causes the control device CL to calculate the position of the base station OB and the transmission timing of the communication signal in the other system OSY by using the reception information including the frequency band and the reception time measured by each base station BS. Further, the communication system SYS causes the control device CL to determine the frequency band in which each base station BS transmits signals sig1 and sig3 by using the received information from each base station BS. As a result, the communication system SYS can acquire information on the other system OSY, and can send and receive signals sig1 and sig3 between the base station BS while suppressing the occurrence of interference with the other system OSY. That is, the communication system SYS can improve the frequency utilization efficiency.

The above detailed description will clarify the features and advantages of the embodiments. It is intended that the claims extend to the features and advantages of the embodiments as described above, without departing from their spirit and scope of rights. Also, anyone with ordinary knowledge in the art should be able to easily come up with any improvements or changes. Therefore, there is no intention to limit the scope of the embodiments having invention to those described above, and it is possible to rely on suitable improvements and equivalents included in the scope disclosed in the embodiments.

10,110 ... IF unit; 20 ... Modulation unit; 30 ... Transmission / reception unit; 40 ... Demodulation unit; 50,120 ... Control unit; 60 ... Notification unit; 130 ... Calculation unit; 140 ... Determination unit; AT1 ... Antenna; BS ( 1) -BS (4), OB (1) -OB (3) ... Base station; sig1, sig3 ... Signal; OSY ... Other system; SC1-SCN ... Subcarrier; SYS ... Communication system

Claims (9)

A pair of base stations that transmit and receive a first signal containing data facing each other,
A control device for controlling each of the plurality of pairs of base stations is provided.
Each of the plurality of pairs of base stations
A transmission unit that transmits the first signal to the opposing base station,
A receiver that receives the first signal from the opposing base station and a second signal in at least one other system that is different from the pair of base stations.
A notification unit that notifies the control device of received information indicating the second signal in the other system that has been received.
A control unit that controls the transmission power of the first signal based on the control information from the control device is provided.
The control device is
A receiving unit that receives the received information of the other system from each of the pair of base stations.
A calculation unit for calculating an timing of the other system using the received information to send the second signal,
A determination unit that determines a frequency band in which each of the plurality of pairs of base stations transmits the first signal using the received information.
Before Symbol timing of the another system calculated, and a notification unit for the determined control information indicating the said frequency band in each of the plurality of pairs of base stations to notify each of the plurality of pairs of base station Prepare ,
When the second signal is not transmitted at the timing of transmitting the first signal, the control unit causes the transmission unit to transmit the first signal with the first transmission power, and the first signal is transmitted. When the second signal is transmitted at the timing of transmitting the signal, the communication is characterized in that the transmitting unit transmits the first signal with a second transmission power smaller than the first transmission power. system. A pair of base stations that transmit and receive a first signal having a plurality of subcarriers including data facing each other,
A control device for controlling each of the plurality of pairs of base stations is provided.
Each of the plurality of pairs of base stations
A transmission unit that transmits the first signal to the opposing base station,
A receiver that receives the first signal from the opposing base station and a second signal in at least one other system that is different from the pair of base stations.
A notification unit that notifies the control device of received information indicating the second signal in the other system that has been received.
A control unit that controls the transmission power of the first signal based on the control information from the control device is provided.
The control device is
A receiving unit that receives the received information of the other system from each of the pair of base stations.
A calculation unit that calculates the timing at which the other system transmits the second signal using the received information, and
A determination unit that determines a frequency band in which each of the plurality of pairs of base stations transmits the first signal using the received information.
It is provided with a notification unit for notifying each of the pair of base stations of the control information indicating the calculated timing in the other system and the frequency band in each of the determined pair of base stations. ,
Wherein, if the previous SL said second signal at a timing of transmitting the first signal is being transmitted, other transmission power of a sub-carrier adjacent to the second signal of the plurality of sub-carriers A communication system characterized in that the transmission unit transmits the first signal to be smaller than the transmission power of the subcarrier. A pair of base stations that transmit and receive a first signal containing data facing each other,
A control device for controlling each of the plurality of pairs of base stations is provided.
Each of the plurality of pairs of base stations
A transmission unit that transmits the first signal to the opposing base station,
A receiver that receives the first signal from the opposing base station and a second signal in at least one other system that is different from the pair of base stations.
A notification unit that notifies the control device of received information indicating the second signal in the other system that has been received.
A control unit that controls the transmission power of the first signal based on the control information from the control device is provided.
The control device is
A receiving unit that receives the received information of the other system from each of the pair of base stations.
A calculation unit that calculates the timing at which the other system transmits the second signal using the received information, and
A determination unit that determines a frequency band in which each of the plurality of pairs of base stations transmits the first signal using the received information.
It is provided with a notification unit for notifying each of the pair of base stations of the control information indicating the calculated timing in the other system and the frequency band in each of the determined pair of base stations. ,
The calculating unit selects the three base stations among the plurality of pairs of base station, before Symbol timing in the other systems using the said received information of another system from the selected the three base stations A communication system characterized by calculating. A transmitter that transmits a first signal containing data to an opposing base station,
A receiving unit that receives the first signal from the opposing base station and a second signal in at least one other system different from the opposing base station.
A notification unit that notifies an external control device of received information indicating the second signal in the other system that has been received.
A control unit that controls the transmission power of the first signal based on the control information from the control device.
With
When the second signal is not transmitted at the timing of transmitting the first signal, the control unit causes the transmission unit to transmit the first signal with the first transmission power, and the first signal is transmitted. When the second signal is transmitted at the timing of transmitting the signal, the transmitting unit is made to transmit the first signal with a second transmission power smaller than the first transmission power.
A base station characterized by that. A transmitter that transmits a first signal having a plurality of subcarriers including data to an opposing base station, and a transmitter.
A receiving unit that receives the first signal from the opposing base station and a second signal in at least one other system different from the opposing base station.
A notification unit that notifies an external control device of received information indicating the second signal in the other system that has been received.
A control unit that controls the transmission power of the first signal based on the control information from the control device is provided .
When the second signal is transmitted at the timing of transmitting the first signal, the control unit transfers the transmission power of the subcarrier adjacent to the second signal among the plurality of subcarriers to another. A base station characterized in that the transmission unit transmits the first signal to be smaller than the transmission power of the subcarrier . A control device that controls each of a plurality of pairs of base stations that transmit and receive a first signal containing data so as to face each other.
Received information indicating a second signal in at least one other system different from the pair of base stations received by each of the pair of base stations is received from each of the pair of base stations. With the receiver
A calculation unit for calculating an timing of the other system using the received information to send the second signal,
A determination unit that determines a frequency band in which each of the plurality of pairs of base stations transmits the first signal using the received information.
Comprising a front Symbol timing of the another system calculated, and a notification unit for the determined control information indicating said frequency bands in each of the plurality of pairs of base stations to notify each of the plurality of pairs of base station ,
The calculation unit selects three base stations from the plurality of pair of base stations, and uses the received information of the other system from the selected three base stations to perform the timing in the other system. A control device characterized by calculating . A control method for a communication system including a plurality of pairs of base stations that transmit and receive a first signal containing data facing each other and a control device that controls each of the plurality of pairs of base stations.
Each of the plurality of pairs of base stations transmits the first signal to the opposing base stations.
Each of the pair of base stations receives the first signal from the opposing base station and a second signal in at least one other system different from the pair of base stations.
Each of the plurality of pairs of base stations notifies the control device of received information indicating the second signal in the other system that has been received.
The control device receives the received information of the other system from each of the pair of base stations.
The control device calculates the timing of the other system using the received information to send the second signal,
The control device uses the received information to determine a frequency band in which each of the plurality of pairs of base stations transmits the first signal.
The control unit may notify the previous SL timing of calculating the other system, the determined control information indicating said frequency bands in each of the plurality of pairs of base stations to each of the plurality of pairs of base station ,
Each of the plurality of pairs of base stations has a first transmission power when the second signal is not transmitted at the timing of transmitting the first signal based on the control information from the control device. When the first signal is transmitted to the transmission unit and the second signal is transmitted at the timing of transmitting the first signal, the second transmission power smaller than the first transmission power is used. control method, characterized in that the said first signal so as to transmit the transmission unit, controls the transmission power of said first signal. A control method for a communication system having a plurality of pairs of base stations for transmitting and receiving first signals having a plurality of subcarriers including data facing each other and a control device for controlling each of the plurality of pairs of base stations. hand,
Each of the plurality of pairs of base stations transmits the first signal to the opposing base stations.
Each of the pair of base stations receives the first signal from the opposing base station and a second signal in at least one other system different from the pair of base stations.
Each of the plurality of pairs of base stations notifies the control device of received information indicating the second signal in the other system that has been received.
The control device receives the received information of the other system from each of the pair of base stations.
The control device calculates the timing at which the other system transmits the second signal using the received information.
The control device uses the received information to determine a frequency band in which each of the plurality of pairs of base stations transmits the first signal.
The control device notifies each of the pair of base stations of the calculated control information indicating the timing in the other system and the frequency band in each of the determined pair of base stations.
When the second signal is transmitted at the timing of transmitting the first signal, each of the pair of base stations has the plurality of subcarriers based on the control information from the control device. Of these, the transmission power of the first signal is such that the transmission power of the subcarrier adjacent to the second signal is made smaller than the transmission power of the other subcarriers so that the transmission unit transmits the first signal. To control
A control method characterized by that. A control method for a communication system including a plurality of pairs of base stations that transmit and receive a first signal containing data facing each other and a control device that controls each of the plurality of pairs of base stations.
Each of the plurality of pairs of base stations transmits the first signal to the opposing base stations.
Each of the pair of base stations receives the first signal from the opposing base station and a second signal in at least one other system different from the pair of base stations.
Each of the plurality of pairs of base stations notifies the control device of received information indicating the second signal in the other system that has been received.
The control device receives the received information of the other system from each of the pair of base stations.
The control device selects three base stations from the plurality of pair of base stations, and the other system uses the received information of the other system from the selected three base stations to perform the second system. Calculate the timing to send the signal of
The control device uses the received information to determine a frequency band in which each of the plurality of pairs of base stations transmits the first signal.
The control device notifies each of the pair of base stations of the calculated control information indicating the timing in the other system and the frequency band in each of the determined pair of base stations.
Each of the plurality of pairs of base stations controls the transmission power of the first signal based on the control information from the control device.
A control method characterized by that.

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