JP5411608B2 - Radio relay apparatus, radio relay apparatus control method, and radio communication system - Google Patents

Description

  The present invention relates to a radio relay apparatus that relays radio communication between a base station and a terminal station, a control method thereof, and a radio communication system including the same, and more particularly, relays radio communication between an outdoor base station and an indoor terminal station. It relates to a regenerative indoor repeater.

  For example, in a wireless communication system using WiMAX, a communication state between a base station and a terminal station should be ensured even when the terminal station exists in an area where radio waves from the base station are difficult to reach (for example, indoors). A wireless relay device is used.

  The wireless relay device has an antenna for a base station for transmitting / receiving radio waves to / from a base station, and an antenna for a terminal station for transmitting / receiving radio waves to / from a terminal station. The regenerative wireless relay device once demodulates the radio wave from the base station received by the base station antenna, modulates only the necessary signal, amplifies the signal, and then directs the signal from the terminal antenna to the terminal station. Send. In addition, the regenerative wireless relay device once demodulates the radio wave from the terminal station received by the terminal antenna, modulates only the necessary signal, amplifies the signal, and then transmits the signal from the base station antenna to the base station. Send to. In this way, mutual communication between the base station and the terminal station is ensured by way of the wireless relay device.

  Patent Document 1 listed below discloses a PHS communication system including a wireless relay device. The radio relay apparatus includes a base station communication unit connected to the base station antenna and a terminal station communication unit connected to the mobile station antenna. Then, the reception timing of the base station communication unit is matched with the transmission timing of the terminal station communication unit, and the mutual interference between the communication radio wave of the base station communication unit and the communication radio wave of the terminal station communication unit is suppressed. Therefore, the base station communication unit and the terminal station communication unit are arranged apart from each other by wired connection using a cable.

JP 2000-78065 A

  In the wireless relay device corresponding to WiMAX, the transmission timing of the base station communication unit and the reception timing of the terminal station communication unit are matched, and the reception timing of the base station communication unit and the transmission timing of the terminal station communication unit are matched. Is generally a communication method (a normal rotation method described later).

  By the way, in an indoor repeater or the like installed in a general household, if an integrated configuration is to be realized by attaching an antenna for a base station and an antenna for a terminal station to an apparatus housing, the antenna for the base station is inevitably required. And the terminal station antenna approach. For this reason, inter-antenna isolation between the antenna for the base station and the antenna for the terminal station cannot be obtained.

  Therefore, in this case, the transmission radio wave from the antenna for the base station wraps around the antenna for the terminal station, thereby affecting the communication performance between the terminal station communication unit and the terminal station. When the transmitted radio wave wraps around the antenna for the base station, the communication performance between the base station communication unit and the base station is affected.

  By the way, in determining the communicable area of the wireless relay device, the influence of the transmission radio wave from the antenna for the base station on the communication performance between the terminal station communication unit and the terminal station is often dominant. First, it is necessary to take measures against this effect. Here, since the transmission power of the communication unit with respect to the base station is controlled by the base station, it cannot be set freely in the radio relay apparatus. Therefore, in order to suppress the influence of the transmission radio wave from the antenna for the base station on the communication performance between the communication unit for the terminal station and the terminal station, the reception of the communication unit for the terminal station caused by radio wave interference is particularly important. In order to suppress the decrease in sensitivity (in other words, the increase in the minimum reception sensitivity), it is necessary to increase the set value of the reception power of the radio wave transmitted from the terminal station in the terminal station communication unit. This leads to an increase in the transmission power of the terminal station.

  In general, the transmission power of the terminal station is set by the control of the base station. The base station sets the transmission power of the terminal station to an appropriate value in consideration of propagation loss between the base station and the terminal station. As a result, the influence of the transmission radio wave from the terminal station on the base station (peripheral base station) that is not the connection target is avoided.

  However, as described above, the transmission power of the terminal station connected to the radio relay apparatus adopting the normal rotation method is such that the transmission radio wave from the antenna for the base station is in communication performance between the terminal station communication unit and the terminal station. In order to suppress the influence, it is necessary to set a larger value than the appropriate value to be set according to the propagation loss. As a result, the power consumption of the terminal station increases, and there is a high possibility that the transmission radio waves from the terminal stations under the control of the wireless relay device will affect the neighboring base stations and the neighboring terminal stations.

  In addition, in order to suppress the influence of the transmission radio wave from the terminal station antenna on the communication performance between the base station communication unit and the base station, wrap around the radio wave from the terminal antenna to the base station antenna. In order to suppress this, it is necessary to reduce the transmission power of the communication unit with respect to the terminal station. This acts in the direction of narrowing the communicable area of the wireless relay device.

  On the other hand, according to the wireless relay device disclosed in Patent Document 1, the inter-antenna isolation is obtained by disposing the physical distance between the base station communication unit and the terminal station communication unit away from each other. Therefore, it is possible to suppress the above-described problem in the forward rotation method.

  However, according to the wireless relay device disclosed in Patent Document 1, the base station communication unit and the terminal station communication unit need to be spaced apart from each other by wired connection. Therefore, it is necessary to select each installation location of the communication unit with respect to the base station and the communication unit with respect to the terminal station while measuring the degree of mutual interference of the communication radio waves, and the cable is wired between the installation locations of both communication units. Since it is necessary, the installation work becomes complicated and the convenience for the user is low. Moreover, since the housing | casing for storing an anti-base station communication part and the housing | casing for storing an anti-terminal station communication part are needed separately, and a cable is also required, an increase in cost is caused.

  The present invention has been made to solve such a problem, and it is possible to suppress problems in the forward rotation system without arranging the base station communication unit and the terminal station communication unit apart from each other. Another object of the present invention is to obtain a wireless relay device, a control method thereof, and a wireless communication system including the wireless relay device.

The radio relay apparatus according to the first aspect of the present invention performs communication with a base station using a first frequency channel among a plurality of frequency channels, and also performs second communication among the plurality of frequency channels. A radio relay apparatus that relays communication between the base station and the terminal station by performing communication with the terminal station using a frequency channel of the base station, and transmits and receives radio waves to and from the base station A base station antenna for performing communication, a terminal antenna for transmitting and receiving radio waves to and from the terminal station, a base station communication unit connected to the base station antenna, and the terminal station The one or more terminal station communication unit connected to the antenna and the one or more base station antennas obtained by demodulating one or more radio waves received from one or more base stations by the base station communication unit Used by each of the radio waves A storage unit that stores information relating to the frequency channel being used in association with each of the one or more base stations, and a period during which the communication unit with the base station performs a transmission operation and a period during which a reception operation is performed. And a control unit that controls a period during which the terminal station communication unit performs a transmission operation and a period during which a reception operation is performed, and the control unit stores the information stored in the storage unit. On the basis of the period during which the communication with the base station communication unit performs the reception operation, the mobile communication with the terminal station communication unit performs the reception operation within the period in which the communication with the base station communication unit performs the transmission operation. Receiving the communication with the terminal station communication unit within a period during which the communication with the base station communication unit is performing a reception operation. To perform both operation and transmission operation, It is characterized in that for selecting one of the second communication method.

  Here, the concept of “frequency channel” includes a frequency band (the same applies hereinafter).

  According to the wireless relay device according to the first aspect, the storage unit can be obtained by demodulating one or more radio waves received by the base station antenna from one or more base stations by the base station communication unit. Information regarding the frequency channel used by each of the one or more radio waves is stored in association with each of the one or more base stations. Then, the control unit selects one of the first communication method and the second communication method based on the information stored in the storage unit. In the first communication method, the control unit causes the terminal station communication unit to perform a reception operation and the base station communication unit to perform a transmission operation during a period in which the base station communication unit performs a reception operation. The transmission operation to the terminal station communication unit is performed within the period. Further, in the second communication method, the control unit causes the terminal station communication unit to perform both the reception operation and the transmission operation during the period in which the base station communication unit is performing the reception operation. That is, in both the first communication method and the second communication method, the reception operation is not performed on the terminal station communication unit within the period in which the communication unit with the base station performs the transmission operation. Therefore, it is possible to avoid a situation in which the transmission radio wave from the base station communication unit becomes an interference wave with respect to the radio wave transmission from the terminal station that the terminal station antenna originally wants to receive. As a result, the communication between the antenna for the base station and the antenna for the terminal station is compared with the case where the communication unit for the terminal station performs the receiving operation during the period during which the communication unit for the base station performs the transmission operation. Since the influence of radio wave interference is reduced, the base station communication unit and the terminal station communication unit do not need to be spaced apart from each other. In addition, since the influence of radio wave interference from the base station communication unit to the terminal station communication unit is small, the minimum reception sensitivity of the terminal station communication unit does not increase, and there is no need to increase the transmission power of the terminal station . As a result, it is possible to reduce the power consumption of the terminal station and to suppress the influence of the transmission radio wave from the terminal station under the wireless relay device on the peripheral base station and the peripheral terminal station.

  Further, in both the first communication method and the second communication method, the terminal station communicates with the terminal station within a period during which the communication unit with the base station performs a transmission operation (that is, a period during which the base station performs a reception operation). On the other hand, the transmission operation is not performed. Therefore, it is possible to avoid a situation in which a transmission radio wave from a terminal station becomes an interference wave with respect to a peripheral base station that is not an original connection destination base station.

Further, in the second communication scheme, it is not necessary to cause the terminal station communication unit to perform the transmission operation within the period in which the base station communication unit is performing the transmission operation. Therefore, it is possible to avoid a situation where the transmission radio wave from the terminal station communication unit becomes an interference wave with respect to the transmission radio wave from the base station communication unit that the base station originally wants to receive. Further, unlike the first communication method, the transmission power of the terminal station communication unit does not need to be equal to the transmission power of the base station communication unit. Therefore, the effect of the transmission radio wave from the terminal station communication unit on the communication performance between the base station communication unit and the base station, the effect of the transmission radio wave from the terminal station communication unit on the surrounding base station, and wireless relay Considering the size of the communicable area required for the device, the transmission power of the terminal station communication unit can be arbitrarily set regardless of the transmission power of the base station communication unit.

  The radio relay apparatus according to the second aspect of the present invention is the radio relay apparatus according to the first aspect, in particular, the one or more frequency channels used by the one or more radio waves among the plurality of frequency channels. When there is a frequency channel other than the above, the control unit selects the first communication method.

  According to the wireless relay device according to the second aspect, a frequency channel other than one or more frequency channels used by one or more radio waves (hereinafter referred to as “unused frequency channel”) among a plurality of frequency channels. ) Exists, the control unit selects the first communication method. In this case, the terminal station communication unit performs communication with the terminal station using an unused frequency channel as the second frequency channel. Disadvantages of selecting the second communication method by selecting the first communication method (ie, the transmission operation period of the terminal station communication unit overlaps with a part of the reception operation period of the base station communication unit) For this reason, it is possible to avoid the demerit that it is necessary to suppress the transmission power of the terminal station communication unit. Further, by using an unused frequency channel as the second frequency channel, the influence of communication between the terminal station communication unit and the terminal station on the base station and the surrounding base station, and the base station communication unit It is possible to reduce the influence of communication with the base station on the terminal station.

  The radio relay apparatus according to the third aspect of the present invention is particularly the radio relay apparatus according to the second aspect, wherein the control unit has a maximum frequency interval between the first frequency channel and the second frequency channel. In combination, the first frequency channel is selected from the one or more frequency channels used by the one or more radio waves, and the one or more frequency channels used by the one or more radio waves The second frequency channel is selected from other frequency channels.

  According to the radio base station according to the third aspect, the control unit selects the second frequency channel from the unused frequency channels. This reduces the effect of communication between the terminal station communication unit and the terminal station on the base station and surrounding base stations, and the effect of communication between the base station communication unit and the base station on the terminal station. It becomes possible to do. Further, the control unit selects the first frequency channel and the second frequency channel in a combination that maximizes the frequency interval. Thereby, the effect of communication between the terminal station communication unit and the terminal station on the base station and the surrounding base station, and the effect of communication between the base station communication unit and the base station on the terminal station, It can be effectively reduced or avoided.

  The radio relay apparatus according to the fourth aspect of the present invention is the radio relay apparatus according to the first aspect, in particular, the one or more frequency channels used by the one or more radio waves among the plurality of frequency channels. When there is a frequency channel other than the control unit, the control unit uses the one or more radio waves in a combination that maximizes the frequency interval between the first frequency channel and the second frequency channel. The first frequency channel is selected from one or more frequency channels, and the second frequency channel is selected from frequency channels other than the one or more frequency channels used by the one or more radio waves. When the first frequency channel and the second frequency channel are adjacent to each other, the first communication method is selected. It is an butterfly.

According to the radio base station according to the fourth aspect, the control unit selects the second frequency channel from among the unused frequency channels. This reduces the effect of communication between the terminal station communication unit and the terminal station on the base station and surrounding base stations, and the effect of communication between the base station communication unit and the base station on the terminal station. It becomes possible to do. Further, the control unit selects the first frequency channel and the second frequency channel in a combination that maximizes the frequency interval. Thereby, the effect of communication between the terminal station communication unit and the terminal station on the base station and the surrounding base station, and the effect of communication between the base station communication unit and the base station on the terminal station, It can be effectively reduced or avoided. Furthermore, the control unit selects the first communication method when the first frequency channel and the second frequency channel are adjacent to each other. In the second communication method, since the transmission operation period of the terminal station communication unit overlaps with a part of the reception operation period of the base station communication unit, the radio wave transmitted from the terminal station communication unit is transmitted by the base station communication unit. Received. Therefore, when the first frequency channel and the second frequency channel are adjacent to each other, the influence of the transmission radio wave from the terminal station communication unit on the communication between the base station communication unit and the base station increases. Therefore, when the first frequency channel and the second frequency channel are adjacent to each other, it is possible to avoid such a situation by selecting the first communication method.

  The radio relay apparatus according to the fifth aspect of the present invention is the radio relay apparatus according to the first or fourth aspect, in particular, the one or more radio waves used by the one or more radio waves in the plurality of frequency channels. When there is a frequency channel other than the frequency channel, the control unit uses the one or more radio waves in a combination that maximizes the frequency interval between the first frequency channel and the second frequency channel. The first frequency channel is selected from the one or more frequency channels, and the second frequency channel is selected from frequency channels other than the one or more frequency channels used by the one or more radio waves. And the second communication method is selected when the first frequency channel and the second frequency channel are not adjacent to each other. And it is characterized in Rukoto.

  According to the radio base station according to the fifth aspect, the control unit selects the second frequency channel from the unused frequency channels. This reduces the effect of communication between the terminal station communication unit and the terminal station on the base station and surrounding base stations, and the effect of communication between the base station communication unit and the base station on the terminal station. It becomes possible to do. Further, the control unit selects the first frequency channel and the second frequency channel in a combination that maximizes the frequency interval. Thereby, the effect of communication between the terminal station communication unit and the terminal station on the base station and the surrounding base station, and the effect of communication between the base station communication unit and the base station on the terminal station, It can be effectively reduced or avoided. Furthermore, the control unit selects the second communication method when the first frequency channel and the second frequency channel are not adjacent to each other. In the second communication method, since the transmission operation period of the terminal station communication unit overlaps with a part of the reception operation period of the base station communication unit, the radio wave transmitted from the terminal station communication unit is transmitted by the base station communication unit. Received. Therefore, when the first frequency channel and the second frequency channel are adjacent to each other, the influence of the transmission radio wave from the terminal station communication unit on the communication between the base station communication unit and the base station increases. Therefore, such a situation can be avoided by selecting the second communication method when the first frequency channel and the second frequency channel are not adjacent to each other.

  The radio relay apparatus according to the sixth aspect of the present invention is, in the radio relay apparatus according to the first aspect, particularly one or more frequency channels used by the one or more radio waves among the plurality of frequency channels. When there is no other frequency channel, the control unit selects the second communication method.

  According to the radio relay apparatus according to the sixth aspect, when there is no unused frequency channel among the plurality of frequency channels, the control unit selects the second communication method. Disadvantages of selecting the first communication method by selecting the second communication method (that is, it is necessary to make the transmission power of the terminal station communication unit equal to the transmission power of the base station communication unit, In addition, due to the overlap of the transmission operation period of the base station communication unit and the transmission operation period of the terminal station communication unit, the transmission radio waves from the terminal station communication unit may interfere with each other in the base station and surrounding base stations. It is possible to avoid the demerit of becoming.

  The radio relay apparatus according to a seventh aspect of the present invention is the radio relay apparatus according to the sixth aspect, in particular, the control unit includes a frequency channel having a highest frequency and a frequency channel having a lowest frequency among the plurality of frequency channels. Of these, one having a good communication state is selected as the first frequency channel, and the other is selected as the second frequency channel.

  Here, the concept of “good communication state” includes high RSSI or CINR (the same applies hereinafter).

  According to the wireless relay device according to the seventh aspect, the control unit uses the highest frequency channel and the lowest frequency channel among the plurality of frequency channels as the first frequency channel. And the other as the second frequency channel. By selecting a frequency channel having a good communication state as the first frequency channel, it is possible to perform good communication between the base station and the wireless relay device. Further, by selecting one of the highest frequency channel and the lowest frequency channel as the first frequency channel and the other as the second frequency channel, the first frequency channel and the second frequency are selected. The frequency interval with the channel can be maximized. As a result, it is possible to reduce or avoid the influence of the transmission radio wave from the terminal station communication unit on the communication between the base station communication unit and the base station to the maximum.

  The radio relay apparatus according to the eighth aspect of the present invention is, in the radio relay apparatus according to the first aspect, particularly one or more frequency channels used by the one or more radio waves among the plurality of frequency channels. In the case where there is no other frequency channel, the control unit selects one of the highest frequency channel and the lowest frequency channel among the plurality of frequency channels that has a good communication state as the first frequency channel. And the other is selected as the second frequency channel, and when the transmission power of the terminal station communication unit is equal to or higher than a predetermined value, the second communication method is selected. It is.

  According to the radio relay apparatus according to the eighth aspect, the control unit uses the highest frequency channel and the lowest frequency channel among the plurality of frequency channels as the first frequency channel. And the other as the second frequency channel. By selecting a frequency channel having a good communication state as the first frequency channel, it is possible to perform good communication between the base station and the wireless relay device. Further, by selecting one of the highest frequency channel and the lowest frequency channel as the first frequency channel and the other as the second frequency channel, the first frequency channel and the second frequency are selected. The frequency interval with the channel can be maximized. As a result, it is possible to reduce or avoid the influence of the transmission radio wave from the terminal station communication unit on the communication between the base station communication unit and the base station to the maximum. Moreover, a control part selects a 2nd communication system, when the transmission power of a terminal station communication part is more than predetermined value. When the first communication method is employed when the transmission power of the terminal station communication unit is equal to or greater than a predetermined value, the influence of the transmission radio wave from the terminal station communication unit on the base station and the surrounding base stations is increased. Therefore, when the transmission power of the terminal station communication unit is equal to or higher than a predetermined value, it is possible to avoid such a situation by adopting the second communication method.

The radio relay apparatus according to the ninth aspect of the present invention is the radio relay apparatus according to the first aspect, in particular, the one or more frequency channels used by the one or more radio waves in the plurality of frequency channels. In the case where there is no other frequency channel, the control unit selects one of the highest frequency channel and the lowest frequency channel among the plurality of frequency channels that has a good communication state as the first frequency channel. And the other is selected as the second frequency channel, and when the transmission power of the terminal station communication unit is less than a predetermined value, the first communication method is selected. It is.

  According to the wireless relay device according to the ninth aspect, the control unit uses the highest frequency channel and the lowest frequency channel among the plurality of frequency channels as the first frequency channel. And the other as the second frequency channel. By selecting a frequency channel having a good communication state as the first frequency channel, it is possible to perform good communication between the base station and the wireless relay device. Further, by selecting one of the highest frequency channel and the lowest frequency channel as the first frequency channel and the other as the second frequency channel, the first frequency channel and the second frequency are selected. The frequency interval with the channel can be maximized. As a result, the effect of communication between the terminal station communication unit and the terminal station on the base station and the surrounding base station, and the effect of communication between the base station communication unit and the base station on the terminal station, It can be reduced or avoided to the maximum. In addition, the control unit selects the first communication method when the transmission power of the terminal station communication unit is less than a predetermined value. When the first communication method is employed when the transmission power of the terminal station communication unit is equal to or greater than a predetermined value, the influence of the transmission radio wave from the terminal station communication unit on the base station and the surrounding base stations is increased. Therefore, such a situation can be avoided by adopting the first communication method when the transmission power of the terminal station communication unit is less than a predetermined value.

  The radio relay apparatus according to the tenth aspect of the present invention is the radio relay apparatus according to the first or ninth aspect, particularly in the one or more radio waves used by the one or more radio waves in the plurality of frequency channels. In the case where there is no frequency channel other than the frequency channel, a specific frequency channel in which the influence of the transmission radio wave from the terminal station antenna on the base station that is not a connection target is a predetermined level or less is included in the plurality of frequency channels. If present, the control unit selects the first communication method.

  According to the radio relay apparatus according to the tenth aspect, when there is a specific frequency channel in which the influence of the transmission radio wave from the antenna for the terminal station on the neighboring base station is a predetermined level or less among the plurality of frequency channels. The control unit selects the first communication method. Therefore, by selecting a specific frequency channel as the second frequency channel, the influence of the transmission radio wave from the terminal station communication unit on the base station and surrounding base stations is reduced while adopting the first communication method. It becomes possible to do.

  The radio relay apparatus according to the eleventh aspect of the present invention is the radio relay apparatus according to the tenth aspect, particularly when there is only one specific frequency channel, the control unit controls the specific frequency. A channel is selected as the second frequency channel.

  According to the radio relay apparatus according to the eleventh aspect, when there is only one specific frequency channel, the control unit selects the specific frequency channel as the second frequency channel. By selecting a specific frequency channel as the second frequency channel, the influence of transmission radio waves from the terminal station communication unit on the base station and surrounding base stations is reduced while adopting the first communication method. Is possible.

The radio relay apparatus according to the twelfth aspect of the present invention is the radio relay apparatus according to the tenth aspect, particularly when there are two or more specific frequency channels, the control unit Among the specific frequency channels, the frequency channel of the highest frequency and the frequency channel of the lowest frequency having a large difference between the transmission power of the terminal station communication unit and the maximum transmittable power of the terminal station communication unit The second frequency channel is selected.

  According to the radio relay device according to the twelfth aspect, when there are two or more specific frequency channels, the control unit performs the highest frequency channel and the lowest frequency among the two or more specific frequency channels. Of the frequency channels of the frequency, the one having a large difference between the transmission power of the terminal station communication unit and the maximum transmittable power of the terminal station communication unit is selected as the second frequency channel. By selecting a specific frequency channel as the second frequency channel, the influence of transmission radio waves from the terminal station communication unit on the base station and surrounding base stations is reduced while adopting the first communication method. Is possible. The control unit has a large difference between the transmission power of the terminal station communication unit and the maximum transmittable power among the highest frequency channel and the lowest frequency channel among two or more specific frequency channels. Is selected as the second frequency channel. In this way, by selecting the one having a margin for the maximum transmittable power, it is possible to effectively reduce the influence of the transmission radio wave from the terminal station communication unit on the base station and the peripheral base station. .

  The radio relay apparatus according to a thirteenth aspect of the present invention is the radio relay apparatus according to the eleventh or twelfth aspect, and in particular, the control unit is connected to the second frequency channel among the plurality of frequency channels. The frequency channel with the maximum frequency interval is selected as the first frequency channel.

  According to the radio relay apparatus according to the thirteenth aspect, the control unit selects, as the first frequency channel, a frequency channel having a maximum frequency interval with the second frequency channel among the plurality of frequency channels. By selecting the first frequency channel and the second frequency channel in such a combination that maximizes the frequency interval in this way, communication between the terminal station communication unit and the terminal station is transmitted to the base station and the peripheral base station. It is possible to effectively reduce or avoid the influence exerted and the influence exerted on the terminal station by the communication between the base station communication unit and the base station.

  The wireless relay device according to a fourteenth aspect of the present invention is the wireless relay device according to the first or ninth aspect, particularly in the one or more radio waves used by the one or more radio waves in the plurality of frequency channels. In the case where there is no frequency channel other than the frequency channel, a specific frequency channel in which the influence of the transmission radio wave from the terminal station antenna on the base station that is not a connection target is a predetermined level or less is included in the plurality of frequency channels. If not present, the control unit selects the second communication method.

  According to the radio relay apparatus according to the fourteenth aspect, when there is no specific frequency channel in which the influence of the transmission radio wave from the terminal station antenna on the neighboring base station is a predetermined level or less among the plurality of frequency channels. The control unit selects the second communication method. When the first communication method is adopted when the influence of the transmission radio wave from the terminal station antenna on the peripheral base station exceeds a predetermined level, the influence of the transmission radio wave from the terminal station communication unit on the peripheral base station becomes large. Therefore, in the case where there is no specific frequency channel in which the influence of the transmission radio wave from the terminal station antenna on the peripheral base station is below a predetermined level, this situation can be avoided by adopting the second communication method. It becomes possible to do.

According to a fifteenth aspect of the present invention, there is provided a control method for a radio relay apparatus comprising: a base station antenna for transmitting / receiving radio waves to / from a base station; and a pair for transmitting / receiving radio waves to / from a terminal station. A terminal station antenna, communicating with the base station using a first frequency channel of a plurality of frequency channels, and using a second frequency channel of the plurality of frequency channels A control method of a radio relay apparatus that relays communication between the base station and the terminal station by performing communication with the terminal station, wherein (A) the antenna for the base station has one or more The frequency used by each of the one or more radio waves obtained by demodulating one or more radio waves received from the base station by the anti-base station communication unit connected to the antenna for the base station. Channel related Storing information in association with each of the one or more base stations; and (B) detecting a period during which the base station communication unit performs a transmission operation and a period during which a reception operation is performed; A step of controlling a period during which a communication operation with respect to the terminal station communication unit connected to the terminal station antenna performs a transmission operation and a period during which a reception operation is performed. In step (B), the step (A ), The base station communication unit performs the reception operation within the period during which the base station communication unit performs the reception operation, and the base station communication unit transmits the data. A first communication method for allowing the terminal station communication unit to perform a transmission operation within a period during which the operation is performed, and the terminal communication unit within a period during which the base station communication unit is performing a reception operation. Receiving operation to the station communication unit To perform both the transmission operation, it is characterized in that one is selected with the second communication method.

  According to the control method of the wireless relay device according to the fifteenth aspect, in step (A), one or more radio waves received by the antenna for the base station from one or more base stations are demodulated and obtained thereby. Information regarding the frequency channel used by each of the one or more radio waves is stored in association with each of the one or more base stations. Further, in step (B), a period during which the base station communication unit is performing a transmission operation and a period during which a reception operation is being performed are detected, and a period during which the terminal station communication unit performs a transmission operation and a reception operation Is controlled. In step (B), one of the first communication method and the second communication method is selected based on the information stored in step (A). In the first communication system, the base station communication unit performs the reception operation and the base station communication unit performs the transmission operation during the period in which the base station communication unit performs the reception operation. A transmission operation is performed to the terminal station communication unit within the period. Further, in the second communication method, the control unit causes the terminal station communication unit to perform both the reception operation and the transmission operation during the period in which the base station communication unit is performing the reception operation. That is, in both the first communication method and the second communication method, the reception operation is not performed on the terminal station communication unit within the period in which the communication unit with the base station performs the transmission operation. Therefore, it is possible to avoid a situation in which the transmission radio wave from the base station communication unit becomes an interference wave with respect to the radio wave transmission from the terminal station that the terminal station antenna originally wants to receive. As a result, the communication between the antenna for the base station and the antenna for the terminal station is compared with the case where the communication unit for the terminal station performs the receiving operation during the period during which the communication unit for the base station performs the transmission operation. Since the influence of radio wave interference is reduced, the base station communication unit and the terminal station communication unit do not need to be spaced apart from each other. In addition, since the influence of radio wave interference from the base station communication unit to the terminal station communication unit is small, the minimum reception sensitivity of the terminal station communication unit does not increase, and there is no need to increase the transmission power of the terminal station . As a result, it is possible to reduce the power consumption of the terminal station and to suppress the influence of the transmission radio wave from the terminal station under the wireless relay device on the peripheral base station and the peripheral terminal station.

  Further, in both the first communication method and the second communication method, the terminal station communicates with the terminal station within a period during which the communication unit with the base station performs a transmission operation (that is, a period during which the base station performs a reception operation). On the other hand, the transmission operation is not performed. Therefore, it is possible to avoid a situation in which a transmission radio wave from a terminal station becomes an interference wave with respect to a peripheral base station that is not an original connection destination base station.

  Further, in the second communication scheme, it is not necessary to cause the terminal station communication unit to perform the transmission operation within the period in which the base station communication unit is performing the transmission operation. Therefore, it is possible to avoid a situation where the transmission radio wave from the terminal station communication unit becomes an interference wave with respect to the transmission radio wave from the base station communication unit that the base station originally wants to receive. Further, unlike the first communication method, the transmission power of the terminal station communication unit does not need to be equal to the transmission power of the base station communication unit. Therefore, the effect of the transmission radio wave from the terminal station communication unit on the communication performance between the base station communication unit and the base station, the effect of the transmission radio wave from the terminal station communication unit on the surrounding base station, and wireless relay Considering the size of the communicable area required for the device, the transmission power of the terminal station communication unit can be arbitrarily set regardless of the transmission power of the base station communication unit.

  A wireless communication system according to a sixteenth aspect of the present invention performs communication between a base station and the base station using a first frequency channel among a plurality of frequency channels, and the plurality of frequency channels. A wireless communication system comprising: a wireless relay device that relays communication between the base station and the terminal station by performing communication with the terminal station using the second frequency channel The radio relay device includes: a base station antenna for transmitting / receiving radio waves to / from the base station; a terminal antenna for transmitting / receiving radio waves to / from the terminal station; A base station communication unit connected to a station antenna, a terminal communication unit connected to the terminal antenna, and one or more radio waves received by the base station antenna from one or more base stations. Said base A storage unit that stores information relating to a frequency channel used by each of the one or more radio waves obtained by demodulating in the communication unit in association with each of the one or more base stations; A control unit that detects a period during which the transmission unit performs a transmission operation and a period during which a reception operation is performed, and controls a period during which the terminal station communication unit performs a transmission operation and a period during which the reception operation is performed. And the control unit performs a reception operation with respect to the terminal station communication unit within a period during which the base station communication unit performs a reception operation based on the information stored in the storage unit. And a first communication method for causing the terminal station communication unit to perform a transmission operation within a period during which the base station communication unit performs a transmission operation, and the base station communication unit Within the period of receiving operation To perform both the receiving operation and the transmitting operation to the terminal-station communication unit, and is characterized in that for selecting one of the second communication method.

  According to the wireless communication system of the sixteenth aspect, the storage unit can be obtained by demodulating one or more radio waves received from one or more base stations by the anti-base station antenna by the anti-base station communication unit. Information regarding the frequency channel used by each of the one or more radio waves is stored in association with each of the one or more base stations. Then, the control unit selects one of the first communication method and the second communication method based on the information stored in the storage unit. In the first communication method, the control unit causes the terminal station communication unit to perform a reception operation and the base station communication unit to perform a transmission operation during a period in which the base station communication unit performs a reception operation. The transmission operation to the terminal station communication unit is performed within the period. Further, in the second communication method, the control unit causes the terminal station communication unit to perform both the reception operation and the transmission operation during the period in which the base station communication unit is performing the reception operation. That is, in both the first communication method and the second communication method, the reception operation is not performed on the terminal station communication unit within the period in which the communication unit with the base station performs the transmission operation. Therefore, it is possible to avoid a situation in which the transmission radio wave from the base station communication unit becomes an interference wave with respect to the radio wave transmission from the terminal station that the terminal station antenna originally wants to receive. As a result, the communication between the antenna for the base station and the antenna for the terminal station is compared with the case where the communication unit for the terminal station performs the receiving operation during the period during which the communication unit for the base station performs the transmission operation. Since the influence of radio wave interference is reduced, the base station communication unit and the terminal station communication unit do not need to be spaced apart from each other. In addition, since the influence of radio wave interference from the base station communication unit to the terminal station communication unit is small, the minimum reception sensitivity of the terminal station communication unit does not increase, and there is no need to increase the transmission power of the terminal station . As a result, it is possible to reduce the power consumption of the terminal station and to suppress the influence of the transmission radio wave from the terminal station under the wireless relay device on the peripheral base station and the peripheral terminal station.

  Further, in both the first communication method and the second communication method, the terminal station communicates with the terminal station within a period during which the communication unit with the base station performs a transmission operation (that is, a period during which the base station performs a reception operation). On the other hand, the transmission operation is not performed. Therefore, it is possible to avoid a situation in which a transmission radio wave from a terminal station becomes an interference wave with respect to a peripheral base station that is not an original connection destination base station.

Further, in the second communication scheme, it is not necessary to cause the terminal station communication unit to perform the transmission operation within the period in which the base station communication unit is performing the transmission operation. Therefore, it is possible to avoid a situation where the transmission radio wave from the terminal station communication unit becomes an interference wave with respect to the transmission radio wave from the base station communication unit that the base station originally wants to receive. Further, unlike the first communication method, the transmission power of the terminal station communication unit does not need to be equal to the transmission power of the base station communication unit. Therefore, the effect of the transmission radio wave from the terminal station communication unit on the communication performance between the base station communication unit and the base station, the effect of the transmission radio wave from the terminal station communication unit on the surrounding base station, and wireless relay Considering the size of the communicable area required for the device, the transmission power of the terminal station communication unit can be arbitrarily set regardless of the transmission power of the base station communication unit.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress the subject in a normal rotation system, without arrange | positioning an anti-base station communication part and an anti-terminal station communication part mutually spaced apart.

1 is a diagram schematically showing an overall configuration of a radio communication system according to an embodiment of the present invention. It is a block diagram which shows roughly the internal structure of a radio relay apparatus. It is a timing chart which shows the 1st example about the operation period of transmission / reception. It is a timing chart which shows the 2nd example about the operation period of transmission / reception. It is a timing chart which shows the 3rd example about the operation period of transmission / reception. It is a block diagram which extracts and shows the structure in connection with selection of a communication system among wireless relay apparatuses. It is a flowchart which shows the selection method of the communication system by a control part. It is a flowchart which shows the selection method of the communication system by a control part. It is a flowchart which shows the selection method of the communication system by a control part. It is a flowchart which shows the selection method of the communication system by a control part. It is a flowchart which shows the selection method of the communication system by a control part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the element which attached | subjected the same code | symbol in different drawing shall show the same or corresponding element.

  FIG. 1 is a diagram schematically showing an overall configuration of a radio communication system 1 according to an embodiment of the present invention. In a building 2 such as an office or a user's house, a wireless relay device 3 such as an indoor repeater is installed. In the building 2, a terminal station (or mobile station) 4 used by the user is located. The terminal station 4 is a mobile device or a personal computer corresponding to the WiMAX communication standard. A base station 5 is installed outside the building 2. The terminal station 4 located in the building 2 does not directly receive the transmission radio wave from the base station 5 due to signal attenuation, and communicates with the base station 5 via the wireless relay device 3. .

  The wireless relay device 3 has an external configuration in which a plurality of antennas are attached to one housing. In the example shown in FIG. 1, the wireless relay device 3 transmits and receives radio waves between the antenna 6 </ b> X for transmitting / receiving radio waves to / from the antenna 8 of the base station 5 and the antenna 7 of the terminal station 4. The terminal station antenna 6Y for transmitting and receiving is provided. There may be a plurality of antennas for base station antenna 6X and terminal station antenna 6Y.

The regenerative type radio relay apparatus 3 once demodulates the radio wave from the base station 5 received by the antenna 6X for the base station, modulates only the necessary signal, amplifies the signal, and then transmits the terminal from the antenna 6Y for the terminal station Transmit to station 4. Further, the regenerative type radio relay apparatus 3 once demodulates the radio wave from the terminal station 4 received by the terminal station antenna 6Y, modulates only the necessary signal, amplifies the signal, and then the base station antenna 6X. To the base station 5. In this way, mutual communication between the base station 5 and the terminal station 4 is ensured by passing through the wireless relay device 3. In WiMAX, communication is performed among the wireless relay device 3, the terminal station 4, and the base station 5 using a communication method such as OFDM (Orthogonal Frequency Division Multiplexing) or OFDMA (Orthogonal Frequency Division Multiple Access).

  FIG. 2 is a block diagram schematically showing the internal configuration of the wireless relay device 3. The radio relay device 3 includes a base station communication unit 10 connected to the base station antenna 6X, a terminal station communication unit 20 connected to the terminal antenna 6Y, a control unit 30, and a storage unit 31. It is prepared for. The base station communication unit 10 includes a wireless processing unit 11 and a digital signal processing unit 12. The terminal station communication unit 20 includes a wireless processing unit 21 and a digital signal processing unit 22. In addition, when there are a plurality of antennas 6X and 6Y for terminal stations, there are a plurality of wireless processing units 11 and 12 corresponding to the number.

  The base station communication unit 10 and the terminal station communication unit 20 can each switch and execute a reception operation and a transmission operation. Specifically, the control unit 30 refers to a frame synchronization signal included in the signal received from the base station 5, for example, so that the base station 5 performs a transmission operation (that is, received by the base station communication unit 10). The period during which the operation is performed) and the period during which the base station 5 performs the reception operation (that is, the period during which the base station communication unit 10 performs the transmission operation) are detected. Further, the control unit 30 controls a period during which the terminal station communication unit 20 performs a transmission operation and a period during which a reception operation is performed. The base station communication unit 10 and the terminal station communication unit 20 switch between the reception operation and the transmission operation based on the control signal S7 input from the control unit 30, respectively.

  Although not shown, the radio processing unit 11 includes a bandpass filter, a low noise amplifier, a high frequency amplifier, a frequency mixer, an intermediate frequency amplifier, an IQ demodulator, and an AD connected in this order from the base station antenna 6X side. It is configured with a converter. The wireless processing unit 21 includes a DA converter, an IQ modulator, an intermediate frequency amplifier, a frequency mixer, a high frequency amplifier, a power amplifier, and a bandpass filter connected in this order from the digital signal processing unit 22 side. Has been.

  When the radio wave received from the base station 5 is relayed and transmitted to the terminal station 4, the radio processing unit 11 amplifies the received radio wave received from the base station antenna 6X, demodulates it, and then AD-converts it. A digital signal S1 is generated. The digital signal processing unit 12 retrieves a necessary signal from the digital signal S1, and reproduces the digital signal S2 by performing predetermined signal processing. The digital signal processing unit 22 generates a transmission signal S3 by performing predetermined signal processing on the digital signal S2. The wireless processing unit 21 transmits the transmission radio wave from the terminal station antenna 6Y by DA-converting the transmission signal S3, modulating the signal, and then amplifying it.

  On the other hand, when the radio wave received from the terminal station 4 is relayed and transmitted to the base station 5, the radio processing unit 21 amplifies the received radio wave received from the terminal station antenna 6Y, demodulates it, and performs AD conversion. Thus, the digital signal S4 is generated. The digital signal processing unit 22 retrieves a necessary signal from the digital signal S4 and performs predetermined signal processing to reproduce the digital signal S5. The digital signal processing unit 12 generates a transmission signal S6 by performing predetermined signal processing on the digital signal S5. The radio processing unit 11 transmits the transmission radio wave from the base station antenna 6X by performing DA conversion on the transmission signal S6, modulating the signal, and then amplifying it.

FIG. 3 shows a first operation period of transmission / reception of the base station 5, the base station communication unit 10, the terminal station communication unit 20, and the terminal station 4 with respect to one frame which is a data transmission / reception unit of OFDM. It is a timing chart which shows an example. FIG. 3 shows a method in which the base station communication unit 10 and the terminal station communication unit 20 perform reverse transmission / reception operations at all times. This method is referred to as “forward rotation method” in this specification. Called. In the normal rotation system, the base station 5 performs a transmission operation, the base station communication unit 10 performs a reception operation, and the terminal station communication unit 20 performs a transmission operation within a period of time T11 to T12. The terminal station 4 performs a receiving operation. In addition, during the period from time T12 to T13, the base station 5 performs a reception operation, the base station communication unit 10 performs a transmission operation, and the terminal station communication unit 20 performs a reception operation. The terminal station 4 performs a transmission operation.

  As described above, in the normal rotation system, the transmission operation period of the base station communication unit 10 and the reception operation period of the terminal station communication unit 20 are common, and the reception operation period of the base station communication unit 10 The transmission operation period of the terminal station communication unit 20 is common. Therefore, when the transmission radio wave from the base station antenna 6X wraps around the terminal antenna 6Y, the communication performance between the terminal station communication unit 20 and the terminal station 4 is affected, and the terminal station antenna 6Y Sneak around the base station antenna 6X, the communication performance between the base station communication unit 10 and the base station 5 is affected. In determining the communicable area of the wireless relay device 3, the influence of the transmission radio wave from the base station antenna 6X on the communication performance between the terminal station communication unit 20 and the terminal station 4 becomes dominant. In many cases, in order to suppress a decrease in reception sensitivity of the terminal station communication unit 20 due to radio wave interference (in other words, an increase in the minimum reception sensitivity), the reception power of the terminal station communication unit 20 should be increased. It is necessary to increase the transmission power of the terminal station 4. As a result, the power consumption of the terminal station 4 increases, and the possibility that the transmission radio wave from the terminal station 4 under the control of the wireless relay device 3 affects the neighboring base stations and the neighboring terminal stations is increased. Further, in order to suppress the influence of the transmission radio wave from the terminal station antenna 6Y on the communication performance between the base station communication unit 10 and the base station 5, from the terminal station antenna 6Y to the base station antenna 6X. It is necessary to reduce the transmission power of the terminal station communication unit 20 in order to suppress the wraparound of the radio waves. This acts in the direction of narrowing the communicable area of the wireless relay device 3. For the reasons described above, the forward rotation method is not a desirable method.

  FIG. 4 shows a second example of the transmission / reception operation periods of the base station 5, the base station communication unit 10, the terminal station communication unit 20, and the terminal station 4 with respect to one frame which is a data transmission / reception unit of OFDM. It is a timing chart which shows an example. FIG. 4 shows a method in which the base station communication unit 10 and the terminal station communication unit 20 perform the same transmission / reception operation, and such a method is referred to as a “reversal method” in this specification. In the reverse rotation method, the base station 5 performs a transmission operation, the base station communication unit 10 performs a reception operation, and the terminal station communication unit 20 and the terminal station 4 are within the period of time T21 to T22. Neither transmission nor reception is performed. In addition, during the period from time T22 to T23, the base station 5 performs a transmission operation, the base station communication unit 10 performs a reception operation, and the terminal station communication unit 20 performs a reception operation. The terminal station 4 performs a transmission operation. In addition, during the period from time T23 to T24, the base station 5 performs a reception operation, the base station communication unit 10 performs a transmission operation, and the terminal station communication unit 20 performs a transmission operation. The terminal station 4 performs a receiving operation.

In the reverse method, the transmission operation period of the base station communication unit 10 and the transmission operation period of the terminal station communication unit 20 are common, and the reception operation period of the base station communication unit 10 and the terminal station communication unit 20 The reception operation period is common. Therefore, the above-described problem of the forward rotation method caused by the wraparound of the radio wave between the base station antenna 6X and the terminal station antenna 6Y does not occur in the reverse rotation method. As a result, compared to the case where the terminal station communication unit 20 performs the reception operation during the period in which the base station communication unit 10 performs the transmission operation (that is, the normal rotation system), Since the influence of mutual interference of communication radio waves with the terminal station antenna 6Y is reduced, it is not necessary to arrange the base station communication unit 10 and the terminal station communication unit 20 apart from each other. That is, since the wireless relay device 3 can be configured by accommodating the base station communication unit 10 and the terminal station communication unit 20 in one housing, the installation work is simplified and the convenience of the user can be improved. Cost can be reduced.

  On the other hand, in the reverse system, the transmission operation period of the base station communication unit 10 and the transmission operation period of the terminal station communication unit 20 are common. Therefore, if the transmission radio field strength from the terminal station antenna 6Y is extremely reduced with respect to the transmission radio field intensity from the base station antenna 6X, the transmission radio wave from the base station antenna 6X in the terminal station 4 becomes an interference wave. Therefore, the reception sensitivity of the terminal station 4 is reduced due to radio wave interference. Therefore, even if the communication area of the wireless relay device 3 is small and sufficient, the transmitted radio wave intensity from the terminal station antenna 6Y needs to be increased more than necessary, so The effect will increase. Further, if the transmission radio wave intensity from the terminal antenna 6Y is extremely increased, the transmission radio wave from the terminal antenna 6Y in the base station 5 becomes an interference wave. Therefore, even if the communication area of the wireless relay device 3 is wide, if the radio wave reception level of the base station antenna 6X from the base station 5 is high, the transmission radio wave intensity from the terminal station antenna 6Y is reduced. Since it is necessary, a situation where the communication area of the wireless relay device 3 cannot be sufficiently covered may occur. As described above, in the reverse rotation method, there is a restriction that the transmission power of the base station communication unit 10 and the transmission power of the terminal station communication unit 20 must be set to the same level. As a result, the influence of the transmission radio wave from the terminal station communication unit 20 on the communication performance between the base station communication unit 10 and the base station 5, and the transmission radio wave from the terminal station communication unit 20 Considering the influence on the base station and the size of the communication area required for the radio relay device 3, the transmission power of the terminal station communication unit 20 is set to a desired value regardless of the transmission power of the base station communication unit 10. There is a demerit that it cannot be set to a value. Further, in the reverse method, the base station 5 and the surrounding base stations are connected to the terminal station because the transmission operation period of the base station communication unit 10 and the transmission operation period of the terminal station communication unit 20 overlap. There is also a demerit that the transmission radio wave from the communication unit 20 becomes an interference wave with respect to the transmission radio wave from the base station communication unit 10. Furthermore, in the reversal method, the terminal station 4 has the transmission operation period of the base station communication unit 10 and the transmission operation period of the terminal station communication unit 20 overlap. There is also a demerit that the transmitted radio wave becomes an interference wave with respect to the transmitted radio wave from the terminal station communication unit 20.

  FIG. 5 shows a third example of the transmission / reception operation periods of the base station 5, the base station communication unit 10, the terminal station communication unit 20, and the terminal station 4 with respect to one frame which is a data transmission / reception unit of OFDM. It is a timing chart which shows an example. FIG. 5 shows a scheme in which both the transmission operation period and the reception operation period of the terminal station communication unit 20 correspond to the reception operation period of the base station communication unit 10, and such a method is described in this specification. This is referred to as “quasi-normal rotation system”. In the quasi-normal rotation system, the base station 5 performs a transmission operation, the base station communication unit 10 performs a reception operation, and the terminal station communication unit 20 performs a reception operation within the period of time T31 to T32. And the terminal station 4 is performing a transmission operation. In addition, during the period from time T32 to T33, the base station 5 performs a transmission operation, the base station communication unit 10 performs a reception operation, and the terminal station communication unit 20 performs a transmission operation. The terminal station 4 performs a receiving operation. In addition, during the period from time T33 to T34, the base station 5 performs the receiving operation, the base station communication unit 10 performs the transmission operation, and the terminal station communication unit 20 and the terminal station also perform the transmission operation. No reception operation is performed. The period from time T31 to T32 corresponds to, for example, 12 symbols of the OFDM symbol, the period from time T32 to T33 corresponds to, for example, 17 symbols, and the period from time T33 to T34 corresponds to, for example, 18 symbols.

By adopting the quasi-normal rotation method, the control unit 30 performs both the reception operation and the transmission operation with respect to the terminal station communication unit 20 within the period during which the communication with the base station communication unit 10 performs the reception operation. Make it. Therefore, it is not necessary for the terminal station communication unit 20 to perform a reception operation within a period during which the terminal station communication unit 10 performs a transmission operation. Therefore, the terminal station 4 which the terminal station antenna 6Y originally intended to receive, which has been the main factor limiting the communicable area of the wireless relay device 3 in the normal rotation system, is intended.
It is possible to avoid a situation in which the transmission radio wave from the base station communication unit 10 becomes an interference wave with respect to the radio wave transmission from. As a result, compared to the case where the terminal station communication unit 20 performs the reception operation during the period in which the base station communication unit 10 performs the transmission operation (that is, the normal rotation system), Since the influence of mutual interference of communication radio waves with the terminal station antenna 6Y is reduced, it is not necessary to arrange the base station communication unit 10 and the terminal station communication unit 20 apart from each other. That is, since the wireless relay device 3 can be configured by accommodating the base station communication unit 10 and the terminal station communication unit 20 in one housing, the installation work is simplified and the convenience of the user can be improved. Cost can be reduced.

  In addition, since the terminal station 4 does not need to perform the transmission operation within the period during which the base station communication unit 10 performs the transmission operation (that is, the period during which the base station 5 performs the reception operation), the original connection destination It is possible to avoid a situation in which a transmission radio wave from the terminal station 4 becomes an interference wave with respect to a peripheral base station that is not the base station 5.

  Also, unlike the reverse rotation method, the transmission operation period of the base station communication unit 10 and the transmission operation period of the terminal station communication unit 20 do not overlap, so that the transmission radio wave intensity from the terminal station antenna 6Y is increased more than necessary. There is no need. In addition, unlike the reverse method, the reception operation period of the base station 5 and the transmission operation period of the terminal station communication unit 20 do not overlap, so that the transmission radio wave from the terminal station communication unit 20 is transmitted to the base station 5 and the neighboring base stations. On the other hand, it is possible to avoid a situation that becomes an interference wave. As a result, when the communication area to be covered by the wireless relay device 3 is wide, it is possible to set the transmission radio wave intensity from the terminal station antenna 6Y to be large accordingly.

  On the other hand, in the quasi-normal rotation system, the transmission operation period of the terminal station communication unit 20 overlaps with a part of the reception operation period of the base station communication unit 10. Therefore, there is a demerit that it is necessary to suppress the transmission power of the terminal station communication unit 20 in the same way as the normal rotation method in order to suppress the wraparound of the radio wave from the terminal station antenna 6Y to the base station antenna 6X.

  As described above, the reverse rotation method and the quasi-forward rotation method have advantages and disadvantages, respectively. Therefore, in the wireless relay device 3 according to the present embodiment, the reverse rotation method and the quasi-normal rotation method are switched and selected according to the situation.

  FIG. 6 is a block diagram showing an extracted configuration related to the selection of the communication method in the wireless relay device 3. The wireless relay device 3 is assigned a frequency band that can be used for communication with the base station 5 and the terminal station 4, and there are a plurality of frequency bands (N in the following example, N is an integer of 2 or more). It is divided into frequency channels F1, F2, F3,. In the following example, it is assumed that the frequency gradually increases in the order of frequency channels F1, F2, F3,. In this case, the frequency channel F1 is the lowest frequency and the frequency channel FN is the highest frequency.

The base station communication unit 10 demodulates one or more radio waves received from one or more base stations (including the base station 5 and surrounding base stations) by the base station antenna 6X, thereby generating frequency channels F1 to FN. Among these, one or more frequency channels used by the one or more radio waves are specified. Information relating to the identified frequency channel is stored in the storage unit 31 in association with each of the one or more base stations. That is, the correspondence between the identification information of the base station and the frequency channel used by each base station is stored in the storage unit 31. Here, “the radio relay device is receiving radio waves from the base station” means that the radio relay device and the base station are synchronized, and the radio relay device receives a control signal from the base station. In addition, it means a situation in which RSSI (Received Signal Strength Indication) can be measured in the wireless relay device. As an index representing communication quality, CINR (Carrier to Interference-plus-Noise Ratio) may be used instead of RSSI (the same applies hereinafter). The control unit 30 reads information on the frequency channel received from the base station from the storage unit 31 as reception signal information S8. For example, when the wireless relay device 3 receives the frequency channel F1 from the base station 5 and receives the frequency channel F2 from the neighboring base stations, the received signal information S8 indicating the frequency channels F1 and F2 is stored. Input from the unit 31 to the control unit 30. The base station communication unit 10 measures RSSI (or CINR) of the received signals from the one or more base stations, and provides information on the measured RSSI (or CINR) of the one or more base stations. The information is stored in the storage unit 31 in association with each other. Information regarding RSSI (or CINR) is read from the storage unit 31 by the control unit 30 by being included in the received signal information S8.

  The control unit 30 selects the reverse rotation method or the quasi-forward rotation method as the communication method employed by the wireless relay device 3 based on the received signal information S8. 7 to 11 are flowcharts illustrating a communication method selection method performed by the control unit 30. The flowchart shown in FIG. 7 or 8 is connected to the flowchart shown in FIG. 9, FIG. 10, or FIG. 11 via the connection point A, and the combination thereof is arbitrary.

  Referring to FIG. 7, in step SP11, the control unit 30 includes, among all the frequency channels F1 to FN, frequency channels (hereinafter referred to as “not yet” which are not received by the base station communication unit 10 from the one or more base stations. It is determined based on the received signal information S8 whether or not there is a “used frequency channel”.

  When there is an unused frequency channel (that is, when the determination result in step SP11 is “YES”), in step SP12, the control unit 30 selects the reverse rotation method. By selecting the reverse rotation method, it is possible to avoid the above disadvantages when the quasi-normal rotation method is selected.

  In step SP12, the control unit 30 uses the frequency channel used for communication between the base station communication unit 10 and the base station 5 (hereinafter referred to as “frequency channel for base station”), the terminal station communication unit 20, A frequency channel used for communication with the terminal station 4 (hereinafter referred to as “frequency channel for terminal station”) is selected.

  One frequency channel for the base station is selected from the one or more frequency channels received by the base station communication unit 10 from the one or more base stations. Also, one frequency channel for terminal stations is selected from unused frequency channels. Here, the frequency channel for the base station and the frequency channel for the terminal station are selected in a combination that maximizes the mutual frequency interval. For example, the frequency band is divided into four frequency channels F1, F2, F3, and F4, of which frequency channels F1 and F2 are received from the base station by the base station communication unit 10, and the frequency channels F3 and F4 are received. Is the unused frequency channel. In this case, as frequency channel selection candidates, <frequency channel for base station, frequency channel for terminal station> = <F1, F3>, <F2, F3>, <F1, F4>, and <F2, There are four types of F4>. The control unit 30 selects the combination of <F1, F4> that maximizes the frequency interval between the frequency channel for base station and the frequency channel for terminal station from among the four candidates.

As described above, according to the example shown in FIG. 7, the control unit 30 selects the frequency channel for terminal station from the unused frequency channels. As a result, the influence of communication between the terminal station communication unit 20 and the terminal station 4 on the base station 5 and the surrounding base station, and the communication between the base station communication unit 10 and the base station 5 are the terminal station. 4 can be reduced. Further, the control unit 30 selects the frequency channel for the base station and the frequency channel for the terminal station in a combination that maximizes the frequency interval. As a result, the influence of communication between the terminal station communication unit 20 and the terminal station 4 on the base station 5 and the surrounding base station, and the communication between the base station communication unit 10 and the base station 5 are the terminal station. 4 can be effectively reduced or avoided.

  Referring to FIG. 8, in step SP11, control unit 30 determines whether or not an unused frequency channel exists in all frequency channels F1 to FN based on reception signal information S8.

  When there is an unused frequency channel (that is, when the determination result in step SP11 is “YES”), in step SP13, the control unit 30 selects the frequency channel for base station and the frequency channel for terminal station. Similarly to step SP12, the frequency channel for base station is selected from the one or more frequency channels received by the base station communication unit 10 from the one or more base stations, One frequency channel is selected from unused frequency channels. Similarly to step SP12, the frequency channel for the base station and the frequency channel for the terminal station are selected in a combination that maximizes the mutual frequency interval.

  Next, in step SP14, the control unit 30 determines whether or not the frequency channel for base station and the frequency channel for terminal station selected in step SP13 are adjacent to each other.

  If the frequency channel for base station and the frequency channel for terminal station are adjacent to each other (that is, if the determination result in step SP14 is “YES”), then in step SP15, the control unit 30 performs the reverse rotation method. Select. In the quasi-normal rotation system, the transmission operation period of the terminal station communication unit 20 overlaps with a part of the reception operation period of the base station communication unit 10, so that the transmission radio wave from the terminal station communication unit 20 is transmitted to the base station communication. Received by the unit 10. Therefore, when the quasi-normal rotation system is adopted when the frequency channel for base station and the frequency channel for terminal station are adjacent to each other, the transmission radio wave from the terminal station communication unit 20 is transmitted to the base station communication unit 10 and the base station. The effect on the communication with 5 is increased. Therefore, when the frequency channel for base station and the frequency channel for terminal station are adjacent to each other, such a situation can be avoided by selecting the reverse rotation method.

  On the other hand, if the frequency channel for base station and the frequency channel for terminal station are not adjacent to each other (that is, if the determination result in step SP14 is “NO”), then in step SP16, the control unit 30 Select the quasi-normal rotation method. In this case, since the frequency channel for the base station and the frequency channel for the terminal station are not adjacent to each other, the transmission radio wave from the terminal station communication unit 20 is transmitted to the base station communication even if the quasi-normal rotation system is adopted. A situation in which the influence on communication between the unit 10 and the base station 5 becomes large is avoided.

  In the flowchart shown in FIG. 7 or FIG. 8, when there is no unused frequency channel (that is, when the determination result in step SP11 is “NO”), the process proceeds to the flowchart shown in FIG. To do.

  Referring to FIG. 9, in step SP21, control unit 30 selects a quasi-normal rotation method. By selecting the quasi-normal rotation method, it is possible to avoid the above disadvantages when the reverse rotation method is selected.

In step SP21, the control unit 30 selects the frequency channel for the base station and the frequency channel for the terminal station. Here, the control unit 30 selects the lowest frequency channel F1 and the highest frequency channel FN with the higher RSSI (or CINR) as the frequency channel for the base station and the lower one with the frequency channel for the terminal station. Select as frequency channel. In other words, one of the frequency channel F1 and the frequency channel FN that has a good communication state with the base station communication unit 10 is selected as the frequency channel for the base station, and the other is selected as the frequency channel for the terminal station. . Note that the RSSI (or CINR) value of each of the frequency channel F1 and the frequency channel FN is included in the received signal information S8.

  As described above, according to the example illustrated in FIG. 9, the control unit 30 has a good communication state among the highest frequency channel FN and the lowest frequency channel F1 among the plurality of frequency channels F1 to FN. Is selected as the frequency channel for the base station, and the other is selected as the frequency channel for the terminal station. By selecting a frequency channel with a good communication state as a frequency channel for the base station, it is possible to perform good communication between the base station 5 and the radio relay device 3. Further, by selecting one of the highest frequency channel FN and the lowest frequency channel F1 as the frequency channel for the base station and selecting the other as the frequency channel for the terminal station, the frequency channel for the base station And the frequency interval between the terminal and the frequency channel for terminal stations can be maximized. As a result, even when the quasi-normal rotation method is adopted, the influence of the transmission radio wave from the terminal station communication unit 20 on the communication between the base station communication unit 10 and the base station 5 is reduced or avoided to the maximum. It becomes possible to do.

  Referring to FIG. 10, in step SP22, the control unit 30 selects the frequency channel for the base station and the frequency channel for the terminal station. As in step SP21, one of the frequency channels F1 and FN that has a good communication state with the base station communication unit 10 is selected as the frequency channel for the base station, and the other is the frequency channel for the terminal station. Selected as.

  Next, in step SP23, the control unit 30 determines whether or not the transmission power of the terminal station communication unit 20 is greater than or equal to a predetermined value (for example, −10 dBm).

  If the transmission power of the terminal station communication unit 20 is equal to or greater than a predetermined value (that is, if the determination result in step SP23 is “YES”), then in step SP24, the control unit 30 selects the quasi-normal rotation method. . If the reverse rotation method is adopted when the transmission power of the terminal station communication unit 20 is equal to or greater than a predetermined value, the influence of the transmission radio wave from the terminal station communication unit 20 on the base station 5 and the neighboring base stations becomes large. Therefore, when the transmission power of the terminal station communication unit 20 is equal to or greater than a predetermined value, such a situation can be avoided by adopting the quasi-normal rotation method.

  On the other hand, when the transmission power of the terminal station communication unit 20 is less than the predetermined value (that is, when the determination result in step SP23 is “NO”), the control unit 30 next selects the reverse rotation method in step SP25. . In this case, since the transmission power of the terminal station communication unit 20 is less than a predetermined value, even if the reverse method is adopted, the influence of the transmission radio wave from the terminal station communication unit 20 on the base station 5 and the neighboring base stations is affected. Increasing the situation is avoided.

  Referring to FIG. 11, in step SP26, the control unit 30 has a frequency at which the influence of the transmission radio wave from the terminal station communication unit 20 on the neighboring base stations is below a predetermined level among all the frequency channels F1 to FN. Determine if a channel exists.

As a first example of the determination method, by connecting to each base station from the wireless relay device 3, the transmission power per carrier in the base station communication unit 10 (that is, the base station communication unit 10) is controlled by the control of the base station. Maximum power) value is determined. The maximum transmittable power of the terminal station communication unit 20 is obtained as a value obtained by subtracting a predetermined offset value from the value. When the transmission power of the terminal station communication unit 20 is less than the maximum transmittable power, the control unit 30 determines that the influence on the neighboring base station is below a predetermined level, When the transmission power of the communication unit 20 exceeds the maximum transmittable power, it is determined that the influence on the neighboring base station is not less than a predetermined level.

As a second example of the determination method, the control unit 30 includes a BS_EIRP (Base Station Equivalent) included in a DCD (Downlink Channel Descriptor) broadcast from the base station.
A value obtained by subtracting the RSSI value and a predetermined offset value is calculated from (Isotropically Radiated Power). When the transmission power of the terminal station communication unit 20 is equal to or less than the calculated value, the control unit 30 determines that the influence on the neighboring base station is equal to or less than a predetermined level. When the transmission power of the unit 20 exceeds the calculated value, it is determined that the influence on the neighboring base station is not less than a predetermined level.

  If there is a frequency channel (hereinafter referred to as “specific frequency channel”) whose influence on the peripheral base station is below a predetermined level (that is, if the determination result in step SP26 is “YES”), then in step SP27 The control unit 30 selects the reverse rotation method. By selecting the reverse rotation method, it is possible to avoid the above disadvantages when the quasi-normal rotation method is selected.

  In this case, when only one specific frequency channel exists, the control unit 30 selects the specific frequency band as the frequency channel for the terminal station. Moreover, the control part 30 selects the frequency channel with the largest frequency interval with respect to the frequency channel for terminal stations among several frequency channels F1-FN as a frequency channel for base stations. In this way, by selecting the specific frequency channel as the frequency channel for the terminal station, the effect of the transmission radio wave from the terminal station communication unit 20 on the base station 5 and the surrounding base station is adopted while adopting the reverse method. It becomes possible to reduce. Further, by selecting the frequency channel with the maximum frequency interval with the frequency channel for terminal station as the frequency channel for base station, communication between the terminal station communication unit 20 and the terminal station 4 is performed in the base station 5. In addition, it is possible to effectively reduce or avoid the influence on the base station and the influence on the terminal station 4 due to the communication between the base station communication unit 10 and the base station 5.

  When there are a plurality of specific frequency channels, the control unit 30 determines the transmission power of the terminal station communication unit 20 from the lowest frequency channel and the highest frequency channel among the plurality of specific frequency channels. The frequency channel having the larger difference from the maximum transmittable power of the terminal station communication unit 20 is set as the frequency channel for terminal station. Similarly to the above, the control unit 30 selects a frequency channel having the maximum frequency interval with the frequency channel for terminal station from among the plurality of frequency channels F1 to FN as the frequency channel for base station. As described above, the frequency channel having a margin with respect to the maximum transmittable power is selected as the frequency channel for the terminal station among the lowest frequency channel and the highest frequency channel among the plurality of specific frequency channels. Thus, it is possible to effectively reduce the influence of the transmission radio wave from the terminal station communication unit 20 on the base station 5 and the neighboring base stations.

  On the other hand, when the specific frequency channel does not exist (that is, when the determination result in step SP26 is “NO”), in step SP28, the control unit 30 selects the quasi-normal rotation system. By selecting the quasi-normal rotation method, it is possible to avoid the above disadvantages when the reverse rotation method is selected. In this case, the control unit 30 selects the lowest frequency channel F1 and the highest frequency channel FN with the higher RSSI (or CINR) as the frequency channel for the base station and the lower one with the frequency channel for the terminal station. Select as frequency channel.

  As described above, according to the wireless relay device 3 according to the present embodiment, the storage unit 31 receives one or more radio waves received by the base station antenna 6X from one or more base stations. The information about the frequency channel used by each of the one or more radio waves obtained by demodulating in (1) is stored in association with each of the one or more base stations. Then, the control unit 30 selects one of the reverse rotation method and the quasi-normal rotation method based on the information stored in the storage unit 31. In the reversing method, the control unit 30 causes the terminal station communication unit 20 to perform a reception operation during the period in which the base station communication unit 10 performs a reception operation, and the base station communication unit 10 performs a transmission operation. The terminal station communication unit 20 is caused to perform a transmission operation within the period of time. Further, in the quasi-normal rotation system, the control unit 30 causes the terminal station communication unit 20 to perform both the reception operation and the transmission operation within the period during which the terminal base station communication unit 10 performs the reception operation. That is, in any of the reverse rotation method and the quasi-forward rotation method, the reception operation is not performed on the terminal station communication unit 20 within the period in which the communication processing unit 10 performs the transmission operation. Therefore, it is possible to avoid a situation where the transmission radio wave from the base station communication unit 10 becomes an interference wave with respect to the transmission radio wave from the terminal station 4 that the terminal station antenna 6Y originally wants to receive. As a result, as compared with the case where the terminal station communication unit 20 performs the reception operation during the period in which the base station communication unit 10 performs the transmission operation (forward rotation method), Since the influence of mutual interference of communication radio waves with the terminal station antenna 6Y is reduced, it is not necessary to arrange the base station communication unit 10 and the terminal station communication unit 20 apart from each other. Further, since the influence of radio wave interference from the base station communication unit 10 to the terminal station communication unit 20 is small, the minimum reception sensitivity of the terminal station communication unit 20 does not increase, and the transmission power of the terminal station 4 is reduced. There is no need to raise it. As a result, the power consumption of the terminal station 4 can be reduced, and the influence of the transmission radio wave from the terminal station 4 under the control of the wireless relay device 3 on the peripheral base station and the peripheral terminal station can be suppressed.

  Further, in both the reverse rotation method and the quasi-forward rotation method, the terminal station 4 can be connected to the terminal station 4 within a period during which the communication unit 10 performs a transmission operation (that is, a period during which the base station 5 performs reception operation). To prevent transmission. Therefore, it is possible to avoid a situation in which the transmission radio wave from the terminal station 4 becomes an interference wave with respect to a peripheral base station that is not the base station to which the original connection is made.

  Further, in the quasi-normal rotation system, it is not necessary to cause the terminal station communication unit 20 to perform a transmission operation within a period during which the base station communication unit 10 performs a transmission operation. Therefore, it is possible to avoid a situation in which the transmission radio wave from the terminal station communication unit 20 becomes an interference wave with respect to the transmission radio wave from the base station communication unit 10 that the base station 5 originally wants to receive. Unlike the reverse rotation method, the transmission power of the terminal station communication unit 20 does not need to be equal to the transmission power of the base station communication unit 10. Therefore, the influence of the transmission radio wave from the terminal station communication unit 20 on the communication performance between the base station communication unit 10 and the base station 5, and the influence of the transmission radio wave from the terminal station communication unit 20 on the surrounding base station In consideration of the size of the communicable area required for the wireless relay device 3 and the like, the transmission power of the terminal station communication unit 20 can be arbitrarily set regardless of the transmission power of the base station communication unit 10 It becomes possible.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of claims for patent, and is intended to include all modifications within the scope and meaning equivalent to the scope of claims for patent.

DESCRIPTION OF SYMBOLS 1 Wireless communication system 3 Wireless relay apparatus 4 Terminal station 5 Base station 6X vs. base station antenna 6Y vs. terminal station antenna 10 vs. base station communication part 20 vs. terminal station communication part 30 Control part 31 Storage part

Claims (16)

Communication is performed with a base station using a first frequency channel among a plurality of frequency channels, and communication is performed with a terminal station using a second frequency channel among the plurality of frequency channels. A wireless relay device that relays communication between the base station and the terminal station,
An antenna for a base station for transmitting and receiving radio waves to and from the base station;
A terminal station antenna for transmitting and receiving radio waves to and from the terminal station;
A base station communication unit connected to the base station antenna;
A terminal-station communication unit connected to the terminal-station antenna;
The frequency channel used by each of the one or more radio waves obtained by demodulating one or more radio waves received by the antenna for the base station from one or more base stations by the communication unit for the base station A storage unit for storing information in association with each of the one or more base stations;
A period during which the base station communication unit performs a transmission operation and a period during which a reception operation is performed are detected, and a period during which the terminal station communication unit performs a transmission operation and a period during which a reception operation is performed. A control unit for controlling,
The control unit is based on the information stored in the storage unit,
The terminal station communication unit performs a reception operation within a period during which the base station communication unit performs a reception operation, and the base station communication unit performs a transmission operation during the period during which the base station communication unit performs a transmission operation. A first communication method for causing the terminal station communication unit to perform a transmission operation;
Within the period during which the base station communication unit performs a reception operation, the terminal station communication unit performs both a reception operation and a transmission operation, and the base station communication unit performs a transmission operation. A radio relay apparatus that selects one of a second communication scheme that does not allow the terminal station communication unit to perform a reception operation and a transmission operation with the terminal station within a period .   The control unit selects the first communication method when a frequency channel other than the one or more frequency channels used by the one or more radio waves exists in the plurality of frequency channels. Item 4. The wireless relay device according to Item 1.   The control unit is a combination that maximizes a frequency interval between the first frequency channel and the second frequency channel, and the control unit is configured to select the first frequency channel from among the one or more frequency channels used by the one or more radio waves. The wireless relay device according to claim 2, wherein one frequency channel is selected, and the second frequency channel is selected from frequency channels other than the one or more frequency channels used by the one or more radio waves. . In the case where there are frequency channels other than the one or more frequency channels used by the one or more radio waves in the plurality of frequency channels,
The controller is
The first frequency channel is selected from among the one or more frequency channels used by the one or more radio waves in a combination that maximizes the frequency interval between the first frequency channel and the second frequency channel. Selecting the second frequency channel from frequency channels other than the one or more frequency channels used by the one or more radio waves,
The radio relay apparatus according to claim 1, wherein the first communication method is selected when the first frequency channel and the second frequency channel are adjacent to each other. In the case where there are frequency channels other than the one or more frequency channels used by the one or more radio waves in the plurality of frequency channels,
The controller is
The first frequency channel is selected from among the one or more frequency channels used by the one or more radio waves in a combination that maximizes the frequency interval between the first frequency channel and the second frequency channel. Selecting the second frequency channel from frequency channels other than the one or more frequency channels used by the one or more radio waves,
The radio relay apparatus according to claim 1 or 4, wherein the second communication method is selected when the first frequency channel and the second frequency channel are not adjacent to each other.   The control unit selects the second communication method when there is no frequency channel other than the one or more frequency channels used by the one or more radio waves in the plurality of frequency channels. Item 4. The wireless relay device according to Item 1.   The control unit selects one of the highest frequency channel and the lowest frequency channel among the plurality of frequency channels having a good communication state as the first frequency channel, and the other one as the second frequency channel. The radio relay apparatus according to claim 6, which is selected as a frequency channel. In the case where there is no frequency channel other than the one or more frequency channels used by the one or more radio waves in the plurality of frequency channels,
The controller is
Of the plurality of frequency channels, one having a good communication state is selected as the first frequency channel and the other is selected as the second frequency channel from among the frequency channels having the highest frequency and the lowest frequency channels. ,
The radio relay apparatus according to claim 1, wherein when the transmission power of the terminal station communication unit is equal to or greater than a predetermined value, the second communication method is selected. In the case where there is no frequency channel other than the one or more frequency channels used by the one or more radio waves in the plurality of frequency channels,
The controller is
Of the plurality of frequency channels, one having a good communication state is selected as the first frequency channel and the other is selected as the second frequency channel from among the frequency channels having the highest frequency and the lowest frequency channels. ,
The radio relay apparatus according to claim 1, wherein when the transmission power of the terminal station communication unit is less than a predetermined value, the first communication method is selected. In the case where there is no frequency channel other than the one or more frequency channels used by the one or more radio waves in the plurality of frequency channels,
When there is a specific frequency channel in which the influence of the transmission radio wave from the terminal station antenna with respect to the base station that is not the connection target is equal to or lower than a predetermined level among the plurality of frequency channels, the control unit The wireless relay device according to claim 1, wherein the communication method is selected.   The radio relay apparatus according to claim 10, wherein when only one specific frequency channel exists, the control unit selects the specific frequency channel as the second frequency channel.   When there are two or more of the specific frequency channels, the control unit may select the terminal station from among the highest frequency channel and the lowest frequency channel of the two or more specific frequency channels. The radio relay apparatus according to claim 10, wherein one having a large difference between a transmission power of a communication unit and a maximum transmittable power of the terminal station communication unit is selected as the second frequency channel.   The radio according to claim 11 or 12, wherein the control unit selects, as the first frequency channel, a frequency channel having a maximum frequency interval with the second frequency channel among the plurality of frequency channels. Relay device. In the case where there is no frequency channel other than the one or more frequency channels used by the one or more radio waves in the plurality of frequency channels,
When the specific frequency channel in which the influence of the transmission radio wave from the terminal station antenna on the base station that is not the connection target does not exist within a predetermined level among the plurality of frequency channels does not exist, the control unit The wireless relay device according to claim 1, wherein the communication method is selected. A base station antenna for transmitting and receiving radio waves to and from the base station; and a terminal antenna for transmitting and receiving radio waves to and from the terminal station, the first of the plurality of frequency channels By communicating with the base station using a frequency channel, and communicating with the terminal station using a second frequency channel of the plurality of frequency channels, A method of controlling a wireless relay device that relays communication with the terminal station,
(A) One or more radio waves received by the base station antenna from one or more base stations are demodulated by a base station communication unit connected to the base station antenna, and obtained thereby, Storing information relating to frequency channels used by each of the one or more radio waves in association with each of the one or more base stations;
(B) Detecting a period during which the base station communication unit performs a transmission operation and a period during which a reception operation is performed, and performs a transmission operation with respect to the terminal station communication unit connected to the terminal antenna And a step of controlling a period for performing and a period for performing the receiving operation,
In the step (B), based on the information stored in the step (A),
The terminal station communication unit performs a reception operation within a period during which the base station communication unit performs a reception operation, and the base station communication unit performs a transmission operation during the period during which the base station communication unit performs a transmission operation. A first communication method for causing the terminal station communication unit to perform a transmission operation;
Within the period during which the base station communication unit performs a reception operation, the terminal station communication unit performs both a reception operation and a transmission operation, and the base station communication unit performs a transmission operation. Within the period , one of the second communication methods that does not perform the reception operation and the transmission operation with the terminal station to the terminal station communication unit is selected. Control method. A base station,
Communication is performed with the base station using a first frequency channel among a plurality of frequency channels, and communication is performed with a terminal station using a second frequency channel among the plurality of frequency channels. A wireless communication system comprising a wireless relay device that relays communication between the base station and the terminal station by performing
The wireless relay device is
An antenna for a base station for transmitting and receiving radio waves to and from the base station;
A terminal station antenna for transmitting and receiving radio waves to and from the terminal station;
A base station communication unit connected to the base station antenna;
A terminal-station communication unit connected to the terminal-station antenna;
The frequency channel used by each of the one or more radio waves obtained by demodulating one or more radio waves received by the antenna for the base station from one or more base stations by the communication unit for the base station A storage unit for storing information in association with each of the one or more base stations;
A period during which the base station communication unit performs a transmission operation and a period during which a reception operation is performed are detected, and a period during which the terminal station communication unit performs a transmission operation and a period during which a reception operation is performed. A control unit for controlling,
The control unit is based on the information stored in the storage unit,
The terminal station communication unit performs a reception operation within a period during which the base station communication unit performs a reception operation, and the base station communication unit performs a transmission operation during the period during which the base station communication unit performs a transmission operation. A first communication method for causing the terminal station communication unit to perform a transmission operation;
Within the period during which the base station communication unit performs a reception operation, the terminal station communication unit performs both a reception operation and a transmission operation, and the base station communication unit performs a transmission operation. A wireless communication system that selects one of a second communication scheme that does not allow the terminal station communication unit to perform a reception operation and a transmission operation with the terminal station within a period .

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