JP2009159452A - Interference suppression system and method of suppressing interference between heterogeneous radio communication systems - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interference suppression system and an interference suppression method for restraining deterioration in the communication of a first radio communication system while suppressing interference imparted to a second radio communication system from the base station of a first radio communication system, when the first and second heterogeneous radio systems using the same frequency band coexist. <P>SOLUTION: A transmission control station 300 is provided near the radio station of the radio communication system 20. The transmission control station 300 generates an interference suppression control signal based on acquisition information from the radio station of the radio communication system 20, and transmits the interference suppression control signal to a base station 100 in the communication system of the radio communication system 10. More specifically, the transmission control station 300 functions as a different system monitoring device for monitoring a different system, and transmits the interference suppression control signal based on the monitored result to the base station 100, thus allowing the base station 100 to transmit data corresponding to the situation of the different system, and hence obtaining the interference suppression effect and communication deterioration prevention effect among differen systems. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an interference suppression system that suppresses interference between heterogeneous radio communication systems and an interference suppression method between heterogeneous radio communication systems.

  In a mobile communication system (for example, a mobile phone system) that performs high-speed transmission, a wide wireless communication frequency bandwidth is required. Therefore, when constructing such a mobile communication system, it is necessary to ensure a wide frequency band.

  In general, mobile communication is based on the premise that a terminal moves, and therefore a frequency band below the microwave band is a candidate. However, frequencies below the microwave band are generally already used in existing systems such as fixed microwave communication systems and satellite communication systems. Therefore, in order to ensure a wide frequency band, the system must be configured so as not to interfere with these existing wireless communication systems.

  An example of a frequency band in which a plurality of systems coexist is an ISM band represented by a 2.45 GHz band, for example. In this frequency band, carrier sense is generally used. If it is found by carrier sense that other coexisting radio communication systems do not use the desired frequency band, the system can perform radio communication using that frequency band.

  However, in the mobile phone system, since it is necessary to provide a service constantly and in a plane, it is not possible to share a frequency band in time like the ISM band. Also, since TDMA and CDMA are different systems, it is difficult to introduce them.

  Thus, transmission control considering interference with existing wireless communication systems is a promising candidate for frequency sharing technology between such different systems.

  For example, a case where a mobile communication system and a satellite communication system coexist in the same frequency band will be described. In the following description, the terminal of the mobile communication system is sometimes referred to as MS, and the satellite system ground station is sometimes referred to as ES.

  In the satellite system ground station ES, a high gain aperture antenna such as a parabolic antenna is directed to the satellite. In practice, a sharp beam (usually about a half-value angle of about 2 to 3 °) is directed toward the satellite. In the other direction, the reception level is attenuated by about 50 dB compared to the peak direction of the beam due to the side lobe or null directivity.

  Consider a case where a mobile communication system such as a mobile phone system, which is a system different from the satellite communication system, is operated at the same frequency as the satellite communication system. When using the current technology, a base station of a mobile communication system transmits, for example, omni directivity or sector directivity such as 120 ° or 90 °.

  However, even if directional transmission is performed in such a direction as to avoid the satellite system ground station ES using such directivity transmission technology, the received power from the satellite in the satellite system ground station ES is very small. Interference from a base station of a body communication system becomes a big problem. As described above, the satellite system ground station ES is designed to have a low gain except in the beam direction. However, since the received signal strength from the space station is very low, the mobile communication system in the side lobe direction is Even if there is a base station, the signal from this base station becomes interference.

  Therefore, in the base station of the mobile communication system, transmission control is performed for a predetermined frequency band used in the satellite system ground station ES, and the interference power to the band used by the satellite system earth station ES is set to a predetermined value. The following may be considered.

  In the description so far, a satellite communication system is given as an example of a radio communication system that coexists with a mobile communication system because it is a typical example in that there is no other communication system that can replace the satellite communication system. The same can be considered between other types of wireless communication systems.

As a conventional method for performing transmission control, for example, there is a method described in Patent Document 1. Patent Document 1 discloses a method of reducing interference with other systems by not performing transmission in the entire available band assigned to other systems (see FIG. 12).
Special Table 2000-509578

  However, the above-described conventional method does not use the entire bandwidth that can be used by other systems, and thus the communication of the own system deteriorates.

  The present invention has been made in view of this point, and when different first and second radio systems using the same frequency band coexist, the second radio is transmitted from the base station of the first radio communication system. An object of the present invention is to provide an interference suppression system and an interference suppression method that can suppress deterioration of communication in a first wireless communication system while suppressing interference applied to a wireless station of the communication system.

  The interference suppression system of the present invention includes a first radio communication system that uses a first frequency band, and a second radio communication system that uses a second frequency band that is a part of the first frequency band. An interference suppression system for suppressing interference from the first wireless communication system to the second wireless communication system, provided in the vicinity of a wireless station of the second wireless communication system, An inter-system monitor station that generates an interference suppression control signal based on acquired information from the two wireless communication systems, and transmits the interference suppression control signal using the communication method of the first wireless communication system, and the first wireless communication An interference suppression control signal is received by the communication method of the system, and based on the interference suppression control signal, data in the overlapping band between the usable band of the second wireless communication system and the use band of the own station is received. A configuration that includes a base station to adjust the data transmission, the.

  The interference suppression method of the present invention includes a first radio communication system that uses a first frequency band, and a second radio communication system that uses a second frequency band that is a part of the first frequency band. A method for suppressing interference between heterogeneous radio communication systems, which suppresses interference given to the second radio communication system from the first radio communication system in the vicinity of a radio station of the second radio communication system An interference suppression control signal is generated based on the acquired information from the second wireless communication system by a different system monitor station provided in the second wireless communication system, and the interference suppression control signal is transmitted by the transmission method of the first wireless communication system. Based on the interference suppression control signal, the base station of the first wireless communication system changes the usable bandwidth of the second wireless communication system to the overlapping bandwidth of the use bandwidth of the own station. Kick to adjust the data transmission.

  According to the present invention, when different types of first and second radio systems having overlapping use frequency bands coexist, a base station of the first radio communication system to a radio station of the second radio communication system It is possible to provide an interference suppression system and an interference suppression method that can suppress the deterioration of communication of the first wireless communication system while suppressing interference on the wireless communication system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment, the same components are denoted by the same reference numerals, and the description thereof will be omitted because it is duplicated.

(Embodiment 1)
FIG. 1 is a configuration example of a base station 100 and a transmission control station 300 and a radio station tuner 200 of the second radio communication system 20 in the first radio communication system 10 according to Embodiment 1 of the present invention. FIG. Here, a configuration example is shown in the case where an OFDM (Orthogonal Frequency Division Multiplex) scheme is applied. Here, the first radio communication system 10 will be described as a mobile communication system, and the second radio communication system 20 will be described as a satellite communication system.

  In FIG. 1, a base station 100 includes a transmission data generation unit 101, an error correction coding unit 102, a digital modulation unit 103, a power adjustment unit 104, a subcarrier mapping unit 105, and a fast inverse Fourier transform (IFFT). Unit 106, CP (Cyclic Prefix) insertion unit 107, RF unit 108, antenna 109, timing detection unit 110, CP removal unit 111, fast Fourier transform (FFT) unit 112, and subcarrier demapping unit 113, a transmission control information demodulator 114, and a received data demodulator 115.

  The transmission data generation unit 101 generates transmission data.

  The error correction coding unit 102 performs error correction coding on the transmission data. This error correction coding process is performed at a coding rate based on the setting information received from the transmission control information demodulator 114.

  The digital modulation unit 103 performs digital modulation such as QPSK or 16QAM on the data after error correction coding. The modulation scheme applied to the digital modulation processing is adaptively changed based on setting information received from the transmission control information demodulator 114.

  The power adjustment unit 104 adjusts the transmission power based on the setting information received from the transmission control information demodulation unit 114. The power adjustment is performed in an “available bandwidth” that is allocated to the wireless communication system 20 and can be used. Furthermore, transmission power adjustment of a band excluding the usable band in the “base station used band” used by the base station 100 may be performed in accordance with increase or decrease of the transmission power in the usable band.

  Subcarrier mapping section 105 maps the data whose power has been adjusted by power adjustment section 104 to subcarriers.

  IFFT section 106 performs inverse fast Fourier transform on the data formed by subcarrier mapping section 105 to form an OFDM signal.

  CP insertion section 107 inserts a CP (Cyclic Prefix) into the OFDM signal from IFFT section 106.

  The RF unit 108 performs radio transmission processing (digital / analog conversion processing, up-conversion processing to a radio frequency band, etc.) on the OFDM signal after the CP insertion of the CP insertion unit 107 and transmits it through the antenna 109. In addition, the RF unit 108 performs predetermined radio processing such as down-conversion processing to a baseband band and analog-digital conversion processing on the signal received by the antenna 109, and sends the processed signal to the timing detection unit 110. To do.

  The timing detection unit 110 detects a frame timing and an FFT timing using a received signal (for example, a pilot signal).

  CP removing section 111 removes the CP portion from the received signal based on the timing detected by timing detecting section 110 and sends the obtained signal to FFT section 112.

  The FFT unit 112 performs OFDM demodulation by performing fast Fourier transform on the received signal after the FFT processing. Thereby, a subcarrier signal is obtained.

  Subcarrier demapping section 113 obtains information carried on each subcarrier by demapping the subcarrier signal.

  The transmission control information demodulation unit 114 demodulates the control information transmitted from the transmission control information generation unit 308 of the transmission control station 300. The transmission control information demodulator 114 outputs setting information based on the demodulated control information to the error correction encoder 102, the digital modulator 103, and the power adjuster 104. The reception data demodulation unit 115 performs normal reception processing.

  In FIG. 3, the transmission control station 300 belonging to the same system as the base station 100 includes a base station transmission control unit 301, a subcarrier mapping unit 302, an IFFT unit 303, a CP insertion unit 304, an RF unit 305, An antenna 306. The transmission control station 300 is provided in the vicinity of a radio station belonging to a heterogeneous radio communication system, and monitors the radio communication system 20 that is a different system.

  The base station transmission control unit 301 acquires communication environment information including information indicating reception quality in the wireless communication system 20 from the tuner 200 of the wireless station belonging to the heterogeneous communication system, and based on the reception quality indicated by the information, An interference suppression control signal is generated. That is, the acquired information from the tuner 200 is converted into a signal that can be demodulated by the wireless communication system 10. Based on the interference suppression control signal described above, the base station 100 controls data transmission in the same band as the usable band of the radio communication system 20 among the base station use bands used by the base station 100.

  Specifically, the base station transmission control unit 301 includes a threshold value comparison unit 307 and a transmission control information generation unit 308.

  The threshold comparison unit 307 acquires reception quality information from the tuner 200, and compares the reception quality indicated by the information with a predetermined threshold. The comparison result is output to the transmission control information generation unit 308.

  The transmission control information generation unit 308 generates control information based on the comparison result of the threshold value comparison unit 307. This control information is an instruction to decrease the transmission power when the reception quality (for example, BER) is larger than a predetermined value, and an instruction to increase the transmission power when the reception quality is smaller than the predetermined value (FIG. 2). reference).

  Subcarrier mapping section 302 maps the control information generated by transmission control information generation section 308 to subcarriers.

  IFFT section 303 performs an inverse fast Fourier transform on the data formed by subcarrier mapping section 302 to form an OFDM signal.

  CP insertion section 304 inserts a CP into the OFDM signal from IFFT section 303.

  RF section 305 transmits a radio signal obtained by subjecting the OFDM signal after CP insertion of CP insertion section 304 to radio transmission processing (digital / analog conversion processing, up-conversion processing to a radio frequency band, etc.) via antenna 306. To do.

  In FIG. 1, a radio station tuner 200 of the radio communication system 20 includes an RF unit 201, a demodulation processing unit 202, a reception quality measurement processing unit 203, and a reception quality notification unit 204. In the figure, portions not directly related to the present invention are omitted.

  The RF unit 201 performs predetermined RF processing on the signal from the antenna and sends it to the demodulation processing unit 202.

  The demodulation processing unit 202 performs a predetermined demodulation process on the signal from the RF unit 201 and sends the signal to the tuner using device and the reception quality measurement processing unit 203.

  The reception quality measurement processing unit 203 obtains reception quality such as BER (Bit Error Rate) and PER (Packet Error Rate) in the wireless communication system 20 and notifies the reception quality notification unit 204 of the reception quality.

  The reception quality notification unit 204 notifies the transmission control station 300 of the wireless communication system 10 of the reception quality obtained by the reception quality measurement processing unit 203.

  An operation of the wireless communication system 10 having the above configuration will be described.

  As shown in FIG. 3, in a transmission control station 300 provided in the vicinity of a radio station belonging to a different type of radio communication system, a base station transmission control unit 301 acquires reception quality information from the radio station.

  First, the base station transmission control unit 301 compares the acquired reception quality with a threshold value for determining whether or not interference from other systems received by the wireless station is within an allowable range. .

  Next, the base station transmission control unit 301 generates an interference suppression control signal according to the comparison result. That is, the base station transmission control unit 301 generates a control signal indicating a transmission power down command when the reception quality is lower than the threshold value. By using this control signal to reduce the transmission power of the base station 100 of the own system, it is possible to reduce interference that the own system gives to the radio communication system 20.

  On the other hand, when the reception quality is equal to or higher than the threshold value, the base station transmission control unit 301 determines that the radio communication system 20 has room to receive interference from other systems, and sends a control signal indicating a transmission power up command. Generate. By using this control signal, the transmission power of the base station 100 is excessively increased by increasing the transmission power in the same band as the usable band of the wireless communication system 20 among the base station use bands used by the base station 100. It is possible to prevent the decrease.

  By performing such control, it is possible to prevent deterioration in communication of the wireless communication system 10 due to excessively reducing transmission power while suppressing interference with the wireless communication system 20.

  The interference suppression control signal generated by the base station transmission control unit 301 as described above is transmitted to the base station 100 by the method in the radio communication system 10. In this way, the transmission control station 300 installed in the vicinity of the radio station of the different radio communication system acquires the communication environment information from the radio station, and transmits the interference suppression control signal determined based on the communication environment information to the system of the own system. To the base station 200. As a result, it is possible to perform processing for reducing the influence of the own system on different types of wireless communication systems. In this embodiment, the transmission control station 300 feeds back the interference suppression control signal to the base station 100 wirelessly, but it may be fed back by a wired system such as a telephone or the Internet.

  This interference suppression control signal is demodulated by the transmission control information demodulator 114. The transmission control information demodulator 114 determines a transmission power setting value based on the interference suppression control signal. That is, the transmission control information demodulating unit 114 first sets the transmission power value in the same band as the usable band of the wireless communication system 20 among the base station use bands used by the base station 100 based on the interference suppression control signal. decide. Further, the transmission control information demodulator 114 determines a transmission power value in a band that does not overlap with the available band among the base station use bands used by the base station 100.

  Specifically, the transmission control information demodulation unit 114 increases the transmission power setting value of the base station use band excluding the overlap band when the transmission power in the overlap band of the available band and the base station use band is reduced. (See FIG. 4). Conversely, when the transmission power in the overlapping band between the available band and the base station use band is increased, the transmission power setting value of the base station use band excluding the overlap band is decreased. With these actions, the total power can be kept constant.

  Also, the transmission control information demodulating unit 114 determines the coding rate of the error correction coding unit 102 and the modulation scheme of the digital modulation unit 103 according to the transmission power setting value of the base station use band (see FIG. 5). Specifically, the transmission control information demodulating unit 114 sets a coding rate and a modulation scheme with high error resistance in a band with low transmission power, and a transmission rate with low error resistance in a band with high transmission power. The coding rate and the modulation method that increase the value are set.

  As described above, according to the present embodiment, transmission control station 300 is provided in the vicinity of a radio station of radio communication system 20 that is a different system. The transmission control station 300 generates an interference suppression control signal based on information acquired from the radio station, and transmits the interference suppression control signal to the base station 100 using the communication scheme of the first radio communication system 10. That is, the transmission control station 300 functions as a different system monitor device that monitors a different system, and transmits an interference suppression control signal based on the monitoring result to the base station 100.

  In this way, the base station 100 can perform data transmission according to the situation of the different system, can suppress interference from the radio communication system 10 to the radio communication system 20, and Communication degradation can also be prevented. Thus, the transmission control station 300 and the base station 100 can realize an interference suppression system capable of preventing communication degradation in the wireless communication system 10 while suppressing interference from the wireless communication system 10 to the wireless communication system 20. it can.

  More specifically, the transmission control station 300 acquires information indicating reception quality in the second radio communication system 20. Then, the transmission control station 300 generates a transmission power control signal corresponding to the reception quality level in the overlapping band of the usable band of the radio communication system 20 and the use band of the base station 100.

  By doing so, since the base station 100 can receive the transmission power control signal, data transmission can be performed with transmission power according to the situation of the different system. Thereby, interference from the radio communication system 10 to the radio communication system 20 can be suppressed, and communication deterioration in the radio communication system 10 can be prevented.

  By using the interference suppression system realized in this way, the first radio is transmitted when different first and second radio systems using the same frequency band coexist, such as a mobile communication system and a satellite communication system. It is possible to reduce deterioration of communication between the base station and the terminal of the first radio communication system while suppressing interference given from the base station of the communication system to the radio station of the second radio communication system. Therefore, for example, even in an area where a radio station of a satellite communication system is already installed, it is possible to newly install a mobile communication system using the same frequency band as the satellite communication system.

(Embodiment 2)
In the first embodiment, a case where an OFDM communication method is adopted as a communication method in the wireless communication system 10 is shown. In contrast, in the second embodiment, a case where single carrier communication is employed will be described.

  FIG. 6 is a block diagram showing a configuration example of the base station 400 and the transmission control station 300A of the first radio communication system 10 according to Embodiment 2 of the present invention.

  In FIG. 6, since transmission control station 300A performs single carrier transmission, it does not have a function part required for OFDM transmission which transmission control station 300 of Embodiment 1 has.

  Similarly, the base station 400 does not have a functional unit necessary for OFDM transmission. The base station 400 includes a band pass filter (BPF) unit 401, a power adjustment unit 402, and an addition unit 403 in order to perform single carrier transmission.

  The BPF unit 401 includes filter groups (BPF1 to NPF) having different passbands. The passbands of the filters are set without overlapping each other. The entire pass band of the filter group covers the entire use band of the base station 400. The modulation signal output from the digital modulation unit 103 is separated into a plurality of frequency bands by the BPF unit 401 and input to the power adjustment unit 402 as shown in FIG.

  The power adjustment unit 402 includes power adjustment units 1 to N corresponding to the separated signals separated for each frequency by the BPF unit 401. The power adjustment unit 402 receives the setting information from the transmission control information demodulation unit 114, and adjusts the power value of the output signals of the power adjustment units 1 to N based on the setting information.

  Here, the power adjustment method is performed in the same manner as in the first embodiment. That is, the transmission power information demodulator 114 outputs setting information in the usable band of the wireless communication system 20 and setting information of a portion excluding the usable band in the used band of the base station 300A. Therefore, the power adjustment units 1 to N amplify the input signal based on the setting information corresponding to each pass band.

  Adder 403 adds the signals adjusted in power by power adjuster 402.

  As described above, even when the first wireless communication system 10 is a system that performs single carrier communication, the base station 400 and the transmission control station 300A can suppress interference from the wireless communication system 10 to the wireless communication system 20. Thus, an interference suppression system that can prevent communication degradation in the wireless communication system 10 can be realized. In the present embodiment, transmission control station 300A feeds back an interference suppression control signal to base station 400 wirelessly, but it may be fed back by a wired system such as a telephone or the Internet.

(Embodiment 3)
In the third embodiment, the transmission control station of the first radio communication system 10 acquires communication environment information including information indicating the channel used in the radio station from the radio station of the second radio communication system 20. At the same time, control is performed to stop data transmission only in the same band as the used channel among the used frequency bands of the base stations belonging to the same system.

  FIG. 8 shows a configuration example of base station 600 and transmission control station 800 of first radio communication system 10 and radio station tuner 700 of second radio communication system 20 according to Embodiment 3 of the present invention. FIG.

  Base station 600 has subcarrier mapping section 601 and transmission control information demodulation section 602. Base station 600 is different from base station 100 of Embodiment 1 in that power adjustment unit 104 is not provided.

  Similar to the subcarrier mapping unit 105, the subcarrier mapping unit 601 maps the data generated by the digital modulation unit 103 to subcarriers. However, the subcarrier mapping unit 601 does not perform mapping for a predetermined band based on the setting information from the transmission control information demodulation unit 602, but performs mapping in a band other than that band. That is, data transmission is not performed in the predetermined band.

  The transmission control information demodulation unit 602 demodulates the control information transmitted from the transmission control information generation unit 802 of the transmission control station 800 described later. Transmission control information demodulation section 602 outputs setting information based on the demodulated control signal to subcarrier mapping section 601.

  In FIG. 8, the transmission control station 800 includes a base station transmission control unit 801. This base station transmission control unit 801 has a transmission control information generation unit 802.

  The base station transmission control unit 801 acquires communication environment information including information indicating a used channel being used in the wireless station from the tuner 700 of the wireless station belonging to the heterogeneous communication system, and based on the used channel indicated by the information. To generate an interference suppression control signal. That is, the acquired information from the tuner 700 is converted into a signal that can be demodulated by the wireless communication system 10. With the above-described interference suppression control signal, base station 600 controls data transmission in the same band as the channel used by radio communication system 20 among the base station use bands used by base station 600.

  Specifically, the transmission control information generation unit 802 generates a control signal indicating a transmission stop command in the same band as the used channel.

  In FIG. 8, the radio station tuner 700 of the radio communication system 20 includes a used channel acquisition unit 701 and a used channel notification unit 702.

  The used channel acquisition unit 701 acquires the used channel (band) information used by the tuner 700 from the signal from the demodulation processing unit 202.

  The used channel notification unit 702 notifies the transmission control station 800 of the wireless communication system 10 of the used channel information acquired by the used channel acquisition unit 701.

  As described above, according to the present embodiment, the transmission control station 800 acquires communication environment information including information indicating a channel used in the radio station from the radio station of the second radio communication system 20. Then, control is performed to stop data transmission only in the same band as the used channel among the used frequency bands of the base stations belonging to the same system.

  As a result, data transmission is not stopped in the entire band used by the radio communication system 20, but data transmission is stopped only in the band overlapping with the used channel, so that it is possible to prevent the base station use band from being excessively narrowed. it can. Therefore, it is possible to prevent deterioration of communication of the wireless communication system 10 while suppressing interference with the wireless communication system 20. In this embodiment, transmission control station 800 feeds back the interference suppression control signal to base station 600 wirelessly, but it may be fed back by a wired system such as a telephone or the Internet.

(Embodiment 4)
In the third embodiment, a case where an OFDM communication system is adopted as a communication system in the wireless communication system 10 is shown. On the other hand, in the fourth embodiment, a case where single carrier communication is employed will be described.

  FIG. 9 is a block diagram showing a configuration example of the base station 900 and the transmission control station 800A of the first radio communication system 10 according to Embodiment 4 of the present invention.

  In FIG. 9, since transmission control station 800A performs single carrier transmission, it does not have a functional unit necessary for OFDM transmission that transmission control station 800 of Embodiment 3 has.

  Similarly, the base station 900 does not have a functional unit necessary for OFDM transmission. The base station 900 includes a band pass filter (BPF) unit 401, a switch unit 901, and an addition unit 403 for performing single carrier transmission.

  The switch unit 901 includes a switch group corresponding to each of the separated signals separated for each frequency by the BPF unit 401. The switch unit 901 receives the setting information from the transmission control information demodulating unit 114, and turns on and off the switch group based on the setting information.

  Here, as in the third embodiment, since data transmission is stopped in the same band as the channel used by the wireless station in the frequency band used by the base station, the switch corresponding to that band is turned OFF.

  Even when single carrier communication is applied as described above, data transmission is not stopped in the entire band used by the wireless communication system 20, but data transmission is stopped only in a band overlapping with the used channel. It is possible to prevent the station use band from being narrowed. In this embodiment, transmission control station 800A feeds back the interference suppression control signal to base station 900 wirelessly, but it may be fed back by a wired system such as a telephone or the Internet.

(Embodiment 5)
In the fifth embodiment, the transmission control station of the first radio communication system 10 communicates from the radio station of the second radio communication system 20 with information indicating the used channel being used in the radio station and communication quality information. While acquiring environmental information, it controls transmission power in the same band as the used channel among the used frequency bands of the base stations belonging to the same system.

  FIG. 10 is a block diagram showing a configuration example of the transmission control station 1100 of the first radio communication system 10 and the radio station tuner 1000 of the second radio communication system 20 according to Embodiment 5 of the present invention. is there.

  In FIG. 10, the tuner 1000 includes a reception quality measurement processing unit 203, a reception quality notification unit 204, a use channel acquisition unit 701, and a use channel notification unit 702. In other words, tuner 1000 is used by tuner 200 of the radio station of the second radio communication system according to Embodiment 1 and used channel acquisition section 701 of transmission control station 700 of second radio communication system 20 according to Embodiment 3. And a used channel notification unit 702 are added.

  In FIG. 10, the transmission control station 1100 includes a base station transmission control unit 1101.

  The base station transmission control unit 1101 acquires communication environment information including information indicating the used channel being used in the wireless station and communication quality information from the tuner 1000 of the wireless station belonging to the heterogeneous communication system, and the information indicates An interference suppression control signal is generated based on the channel used and the communication quality. That is, the acquired information from the tuner 1000 is converted into a signal that can be demodulated by the wireless communication system 10. With the above-described interference suppression control signal, the base station 100 controls data transmission in the same band as the channel used by the radio communication system 20 among the band used by the base station 100. That is, base station transmission control section 1101 controls transmission power in the same band as the used channel.

  Specifically, the base station transmission control unit 1101 includes a transmission control information generation unit 1102.

  The transmission control information generation unit 1102 generates control information based on the comparison result of the threshold value comparison unit 307. This control information is an instruction to reduce the transmission power in the used band when the reception quality (for example, BER) is larger than a predetermined value, and increases the transmission power in the used band when the reception quality is smaller than the predetermined value. Instructions.

  As described above, according to the present embodiment, communication environment information including information indicating the channel used by the transmission control station 1100 from the radio station of the second radio communication system 20 and the communication quality information. And the transmission power in the same band as the used channel in the used frequency band of the base stations belonging to the same system is controlled.

  In this way, it is possible to perform power control in accordance with the actual use band overlap situation by adjusting the transmission power in the band overlapping with the used channel, instead of stopping the data transmission in the entire use band of the wireless communication system 20. it can. Therefore, it is possible to more effectively suppress interference with the radio communication system 20 and prevent communication degradation of the radio communication system 10. In the present embodiment, the transmission control station 1100 feeds back the interference suppression control signal to the base station 100 wirelessly, but it may be fed back by a wired system such as a telephone or the Internet.

(Embodiment 6)
In the fifth embodiment, a case where an OFDM communication method is adopted as a communication method in the wireless communication system 10 is shown. In contrast, in the sixth embodiment, a case where single carrier communication is employed will be described.

  FIG. 11 is a block diagram showing a configuration example of a transmission control station 1100A of the first radio communication system 10 according to Embodiment 6 of the present invention.

  In FIG. 11, since transmission control station 1100A performs single carrier transmission, it does not have a functional unit necessary for OFDM transmission included in transmission control station 1100 of the fifth embodiment.

  Also in the present embodiment, as in the fifth embodiment, the transmission power information demodulating unit 114 uses the setting information in the same band as the channel used by the radio station of the radio communication system 20 and the use band out of the band used by the base station 400A. The setting information of the part excluding the channel band is output. Therefore, the power adjustment units 1 to N amplify the input signal based on the setting information corresponding to each pass band.

  Even when single carrier communication is applied as described above, the actual use is not performed by adjusting the transmission power in the band overlapping with the used channel, instead of stopping the data transmission in the entire use band of the line communication system 20. It is possible to perform power control in accordance with the band overlap situation. Therefore, it is possible to more effectively suppress interference with the radio communication system 20 and prevent communication degradation of the radio communication system 10. In the present embodiment, transmission control station 1100A feeds back the interference suppression control signal to base station 400 wirelessly, but it may be fed back by a wired system such as a telephone or the Internet.

  The interference suppression system and the interference suppression method according to the present invention allow the base station of the first wireless communication system to transmit the second wireless communication system when different first and second wireless systems using the same frequency band coexist. It has the effect of suppressing the deterioration of the communication of the first wireless communication system while suppressing the interference to the wireless station, and the wireless station of the satellite communication system has already been installed and is newly the same as the satellite communication system This is useful in an area where a mobile communication system using a frequency band is installed.

The block diagram which shows the structure of the tuner of the base station of the 1st radio | wireless communications system which concerns on Embodiment 1 of this invention, a transmission control station, and the radio station of a 2nd radio | wireless communications system The figure where it uses for description of the process in the transmission control information generation part of the transmission control station of FIG. The figure which shows typically a 1st radio | wireless communications system and a 2nd radio | wireless communications system. The figure where it uses for process description in the transmission control information demodulation part of the base station of FIG. The figure where it uses for process description in the transmission control information demodulation part of the base station of FIG. The block diagram which shows the structure of the tuner of the base station of the 1st radio | wireless communications system which concerns on Embodiment 2 of this invention, a transmission control station, and the radio station of a 2nd radio | wireless communications system The figure which uses for the process description of the band pass filter part of the base station of FIG. The block diagram which shows the structure of the tuner of the base station and transmission control station of a 1st radio | wireless communications system which concern on Embodiment 3 of this invention, and the radio station of a 2nd radio | wireless communications system. The block diagram which shows the structure of the tuner of the base station and transmission control station of a 1st radio | wireless communications system which concern on Embodiment 4 of this invention, and the radio station of a 2nd radio | wireless communications system. The block diagram which shows the structure of the tuner of the base station and transmission control station of a 1st radio | wireless communications system which concerns on Embodiment 5 of this invention, and the radio station of a 2nd radio | wireless communications system. The block diagram which shows the structure of the tuner of the base station and transmission control station of the 1st radio | wireless communications system which concern on Embodiment 6 of this invention, and the radio station of a 2nd radio | wireless communications system. Diagram for explaining a conventional method for reducing interference with other systems

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,20 Wireless communication system 100,400,600,900 Base station 101 Transmission data generation part 102 Error correction encoding part 103 Digital modulation part 104 Power adjustment part 105,302,601 Subcarrier mapping part 106,303 Fast inverse Fourier transform (IFFT) unit 107,304 CP insertion unit 108,201,305 RF unit 109,306 antenna 110 timing detection unit 111 CP removal unit 112 fast Fourier transform (FFT) unit 113 subcarrier demapping unit 114,602 transmission control information demodulation Unit 115 reception data demodulation unit 200,700,1000 tuner 202 demodulation processing unit 203 reception quality measurement processing unit 204 reception quality notification unit 300,800,1100 transmission control station 301,801,1101 base station transmission control unit 30 7 threshold comparison unit 308, 802, 1102 transmission control information generation unit 401 band pass filter (BPF) unit 402 power adjustment unit 403 addition unit 701 used channel acquisition unit 702 used channel notification unit 901 switch unit

Claims (13)

The first wireless communication system that uses a first frequency band and the second wireless communication system that uses a second frequency band that is a part of the first frequency band. An interference suppression system that suppresses interference from a wireless communication system to the second wireless communication system,
Provided in the vicinity of a radio station of the second radio communication system, generates an interference suppression control signal based on acquired information from the second radio communication system, and uses the interference suppression control signal as the first radio communication system A different system monitor station transmitting with the communication method of
An interference suppression control signal is received by the communication method of the first wireless communication system, and data in an overlapping band between an available band of the second wireless communication system and a use band of the own station based on the interference suppression control signal A base station to adjust the transmission;
An interference suppression system comprising: The acquisition information includes information indicating reception quality in the second wireless communication system,
The different system monitor station generates a transmission power control signal corresponding to the reception quality level in the overlapping band, and transmits the transmission power control signal as the interference suppression control signal.
The interference suppression system according to claim 1. The acquisition information includes information indicating a channel used by the wireless station,
The different system monitor station generates a data transmission stop signal in the same band as the used channel and transmits the data transmission stop signal as the interference suppression control signal.
The interference suppression system according to claim 1. The acquired information includes information indicating reception quality in the second wireless communication system and information indicating a channel used by the wireless station,
The different system monitor station generates a transmission power control signal corresponding to the reception quality level in the same band as the channel used by the wireless station, and transmits the transmission power control signal as the interference suppression control signal.
The interference suppression system according to claim 1. The base station of the first wireless communication system is a base station of a mobile communication system;
The radio station of the second radio communication system is a satellite communication system ground station;
The interference suppression system according to any one of claims 1 to 4. The first wireless communication system that uses a first frequency band and the second wireless communication system that uses a second frequency band that is a part of the first frequency band. An interference suppression method between heterogeneous wireless communication systems for suppressing interference from a wireless communication system to the second wireless communication system,
An interference suppression control signal is generated based on the acquired information from the second wireless communication system by a different system monitor station provided in the vicinity of the wireless station of the second wireless communication system, and the interference suppression control signal is Transmitting by the transmission method of the first wireless communication system,
The base station of the first wireless communication system adjusts data transmission in an overlapping band of an available band of the second wireless communication system and a use band of the local station based on the interference suppression control signal.
A method for suppressing interference between different types of wireless communication systems. The acquisition information includes information indicating reception quality in the second wireless communication system,
The different system monitor station generates a transmission power control signal corresponding to the reception quality level in the overlapping band, and transmits the transmission power control signal as the interference suppression control signal.
The interference suppression method between the heterogeneous radio | wireless communications systems of Claim 6. The acquisition information includes information indicating a channel used by the wireless station,
In the different system monitor station, generating a data transmission stop signal in the same band as the used channel, and transmitting the data transmission stop signal as the interference suppression control signal,
The interference suppression method between the heterogeneous radio | wireless communications systems of Claim 6. The acquired information includes information indicating reception quality in the second wireless communication system and information indicating a channel used by the wireless station,
The different system monitor station generates a transmission power control signal according to the reception quality level in the same band as the channel used by the wireless station, and transmits the transmission power control signal as the interference suppression control signal.
The interference suppression method between the heterogeneous radio | wireless communications systems of Claim 6. The base station of the first wireless communication system is a base station of a mobile communication system;
The radio station of the second radio communication system is a satellite communication system ground station;
The method for suppressing interference between heterogeneous wireless communication systems according to any one of claims 6 to 9. A heterogeneous radio communication system that suppresses interference from the first radio communication system to the second radio communication system between first and second radio communication systems, which are heterogeneous radio communication systems that use the same frequency band. Interference suppression method between
Obtaining communication environment information including at least one of information indicating reception quality and information indicating a used channel in use from the radio station of the second radio communication system;
Based on the communication environment information, control data transmission in the same band as the used channel among the base station used bands used by the base station of the first wireless communication system,
A method for suppressing interference between different types of wireless communication systems. The first wireless communication system that uses a first frequency band and the second wireless communication system that uses a second frequency band that is a part of the first frequency band. An interference suppression system that suppresses interference from a wireless communication system to the second wireless communication system,
A tuner included in a radio station of the second radio communication system;
A base station control station that is connected to the tuner, acquires reception environment information from the tuner, converts the reception environment information into a signal that can be demodulated by the first wireless communication system, and transmits the signal;
A base station that coordinates data transmission based on reception environment information transmitted from the base station control station;
An interference suppression system comprising: The base station of the first wireless communication system is a base station of a mobile communication system;
The radio station of the second radio communication system is a satellite communication system ground station;
The interference suppression system according to claim 12.

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