JP2019169829A - Radio relay system - Google Patents

Abstract

The present invention promptly starts wireless communication relay between a base station of a plurality of communication operators (OPs) and a user apparatus by moving to a target position, and suppresses a frequency band used for wireless relay of a plurality of OPs. A mobile first wireless relay station (master) transmits / receives a plurality of first frequency F1 radio signals to / from a fixed base station having a plurality of OPs, and a second radio relay station located at a higher position than the master. A common radio signal of the second frequency F2 is transmitted / received to / from the wireless relay station (slave unit), frequency conversion between F1 and F2 is performed, and wireless communication of a plurality of OPs is switched with the slave unit by time division. Control to relay. The slave unit transmits and receives the F2 wireless signal to and from the master unit, sends and receives a plurality of F1 wireless signals to and from the user device, performs frequency conversion between F1 and F2, and performs relay switching of the master unit. Synchronously, control is performed so that wireless communication of a plurality of OPs is switched and relayed with the master unit in a time-division manner. The bandwidth of F2 is set to the maximum bandwidth among the communication bands of the plurality of OPs. [Selection diagram] Fig. 1

Description

  The present invention relates to a wireless relay system.

  Conventionally, antennas for relays and mobile stations are used in weak electric field areas such as dead areas, mountain areas, and maritime areas where there are obstacles that interfere with line-of-sight propagation between antennas on fixed base stations on the ground. A wireless relay system that performs wireless relay using a mooring balloon equipped with a wireless relay station having an antenna is known (see, for example, Patent Document 1).

JP, 2006-002973, A

  In the conventional wireless relay system, since it is difficult to perform wireless communication between the fixed base station and the wireless relay station mounted on the mooring balloon in the out-of-service area of the fixed base station, the fixed base station and the user apparatus (mobile station) There is a possibility that the wireless communication between them cannot be relayed. Therefore, a base station (eNodeB) function is mounted on a vehicle that can move on the ground, moves to a destination, and a radio relay station (base station) including a base station and a frequency converter mounted on the vehicle that has moved to the destination. A wireless relay system that relays wireless communication between the base station and the user apparatus (mobile station) by performing wireless communication between the mobile station and the wireless relay station (child device) of the moored balloon.

However, this wireless relay system has the following problems.
Since the base unit is composed of a base station device (eNodeB) and a frequency converter, the configuration is complicated. Further, it is necessary to connect the base station device (eNodeB) of the parent device to the core network of the mobile communication network by wire or wirelessly, and the operation is complicated. Furthermore, since the operation of the wireless relay must be performed by the person in charge of the communication operator, when the site is very far away, the operator of the communication operator arrives at the site, and then the master unit installed in the vehicle It takes a lot of time for a specialized communication operator to connect the base station and the core network of the mobile communication network by wire or to set up the system parameters of the base station. Takes time. In addition, when a part of the cell of the fixed base station and the cell of the radio relay station (master unit, slave unit) overlap, interference due to the same frequency occurs, so the cell of the fixed base station and the radio relay station ( It is necessary to avoid interference by preparing different frequencies between the cells of the parent device and the child device. In particular, when wireless relay is simultaneously performed for the mobile communication networks of a plurality of communication operators, it is necessary to perform the connection and setup for each communication operator, so that the time until the start of operation at the site is further increased.
Furthermore, it is necessary to secure a frequency with the same bandwidth as the service link frequency band of each of the plurality of communication operators, and when a plurality of communication operators perform radio relay simultaneously, a total radio relay frequency is required. As the number of operators increases, a larger frequency bandwidth is required accordingly, and there is a demand for suppressing the radio relay frequency bandwidth.

  Note that the above problem is not limited to the case where the user-side radio relay station that performs radio communication with the user apparatus (mobile station) is a radio relay station of a moored balloon, but also by autonomous control or remote operation control from outside. This can occur in the same way even in the case of a radio relay station mounted on an airborne mobile body (a flying body such as a drone) that can stay or move in the airspace.

  A radio relay system according to an aspect of the present invention is a radio relay system that relays radio communication between a fixed base station and a user apparatus of a plurality of communication operators whose radio signal frequencies are different from each other. 1 radio relay station and a 2nd radio relay station located in a position higher than the 1st radio relay station. The first radio relay station includes a first radio communication unit that transmits and receives radio signals of a plurality of first frequencies different from each other corresponding to the plurality of fixed base stations with the fixed base stations of the plurality of communication operators. A second radio communication unit that transmits and receives a radio signal having a second frequency common to the plurality of communication operators to and from the second radio relay station, and performs frequency conversion between the first frequency and the second frequency. Switching control means for controlling the radio communication of the plurality of communication operators to be switched in a time division manner and relayed between the frequency conversion unit and the second radio relay station. The second radio relay station includes a plurality of first frequency radio signals between a first radio communication unit that transmits and receives the radio signal of the second frequency to and from the first radio relay station, and a user apparatus. In synchronization with the relay switching by the switching control means of the first radio relay station, a second radio communication unit for transmitting and receiving, a frequency converter for performing frequency conversion between the first frequency and the second frequency, Switching control means for controlling to switch and relay the wireless communications of the plurality of communication operators in a time-sharing manner with the first wireless relay station. The bandwidth of the second frequency is set to the maximum bandwidth among a plurality of communication bands required for wireless communication of each of the plurality of communication operators.

In the wireless relay system, the switching control unit of the first wireless relay station instructs switching of a relay signal path of the plurality of communication operators in the first wireless relay station and switching of communication operators to be relayed A control unit that controls the switching unit based on the relay switching instruction information, and a transmission unit that transmits the relay switching instruction information to the second wireless relay station, and the second wireless relay The switching control means of the station includes a switching unit that switches relay signal paths of the plurality of communication operators in the second wireless relay station, a receiving unit that receives the relay switching instruction information from the first wireless relay station, A control unit that controls the switching unit based on the relay switching instruction information received from the first wireless relay station.
In the radio relay system, the switching control means of the first radio relay station includes a switching unit that switches relay signal paths of the plurality of communication operators in the first radio relay station, and relay switching schedule information of the communication operators. And a control unit that controls the switching unit based on the relay switching schedule information, and a transmission unit that transmits the relay switching schedule information to the second radio relay station, and the second radio The switching control means of the relay station includes a switching unit that switches relay signal paths of the plurality of communication operators in the second wireless relay station, a receiving unit that receives the relay switching schedule information from the first wireless relay station, A control unit that controls the switching unit based on the relay switching schedule information received from the first radio relay station. .
In the radio relay system, the switching control means of the first radio relay station includes a switching unit that switches relay signal paths of the plurality of communication operators in the first radio relay station, and switching of communication operators to be relayed A receiving unit that receives from the remote control device relay switching instruction information or the communication operator relay switching schedule information, and the switching based on the relay switching instruction information or the relay switching schedule information received from the remote control device A control unit that controls a relay unit, and a transmission unit that transmits the relay switching instruction information or the relay switching schedule information to the second radio relay station, and the switching control unit of the second radio relay station includes: A switching unit that switches relay signal paths of the plurality of communication operators in the second radio relay station; A receiving unit for receiving information or the relay switching schedule information from the first radio relay station, and controlling the switching unit based on the relay switching instruction information or the relay switching schedule information received from the first radio relay station And a control unit.
In the radio relay system, the first radio relay station supplies power to circuits related to radio communication of the first radio relay station and the second radio relay station of a communication operator that does not perform radio relay among the plurality of communication operators. You can cut everything.

In the radio relay system, the first radio relay station further includes a signal power adjustment unit that adjusts the signal power after the frequency conversion so that the signal powers are equal to each other among the plurality of communication operators. The radio relay station may further include a signal power adjustment unit that adjusts the signal power after the frequency conversion so that the plurality of communication operators become equal to each other. The signal power adjustment unit of each of the first radio relay station and the second radio relay station includes, for each of the plurality of communication operators, a band filter that selectively passes a signal of the frequency of the communication operator, and the band filter And an amplifier with automatic gain adjustment that adjusts the signal power after passing through to a predetermined power.
Further, in the wireless relay system, the first wireless relay station may be a plurality of directional antennas whose orientations can be adjusted or controlled so as to track the fixed base stations of the plurality of communication operators, or the plurality You may have the adaptive antenna which consists of several elements which can form a beam so that each fixed base station of each communication operator may be tracked.
Further, in the wireless relay system, for each of the plurality of communication operators, the first frequency and the second frequency are the interference of radio signals in the first radio relay station and the radio signals in the second radio relay station. Different frequencies may be used so that sneak interference does not occur.
In the wireless relay system, the first wireless relay station may be mounted on a mobile body that can move on the ground.
In the wireless relay system, the second wireless relay station may be mounted on a balloon. Here, the first radio relay station may be mounted on a mobile body, and the balloon on which the second radio relay station is mounted may be moored on another mobile body different from the mobile body.
In the wireless relay system, the second wireless relay station may be mounted on a flying object that stays or moves in a predetermined airspace by autonomous control or by external control. Here, the first radio relay station may be mounted on a mobile body, and the mobile body may be provided with a separation / departure unit on which the flying body can be separated.
In the radio relay system, the first radio relay station may be a directional antenna whose direction can be controlled to track the second radio relay station, or a beam so as to track the second radio relay station. You may provide the adaptive antenna which consists of a plurality of elements which can form.
Further, in the wireless relay system, the first wireless relay station may communicate between the wireless signal between the fixed base station and the second wireless relay station according to control information from the outside for each of the plurality of communication operators. A control unit that performs ON / OFF control of the relay with the wireless signal may be provided.
Also, in the wireless relay system, the second wireless relay station is information indicating at least one of a state of transmission and reception of a wireless signal with a user apparatus having the first frequency for each of the plurality of communication operators. May be provided to a predetermined external destination.

  In the wireless relay system, the fixed base station may be a base station installed on the ground or on the sea, or may be a base station staying in the air. The airborne base station may be mounted on a floating body or a flying body that can stay in a predetermined airspace by autonomous control or by external control.

  According to the present invention, after moving to a target position with a simple configuration, it is possible to quickly start relaying wireless communication between a fixed base station and a user apparatus over a mobile communication network of a plurality of communication operators. The frequency band used for the wireless relay between the master unit and the slave unit of the plurality of communication operators can be suppressed while securing a predetermined band for the frequency band of the service link of each of the plurality of communication operators.

1 is a schematic configuration diagram illustrating an example of an overall configuration of a communication system including a wireless relay system according to an embodiment of the present invention. The schematic block diagram which shows an example of the whole structure of the communication system containing the radio relay system which concerns on other embodiment. The block diagram which shows an example of the principal part structure of the 1st radio relay station (master | base_unit) of the radio relay system which concerns on embodiment. The block diagram which shows an example of the principal part structure of the 2nd wireless relay station (slave machine) of the wireless relay system which concerns on embodiment. The block diagram which shows one structural example of the 1st wireless relay station (master | base_station) corresponding to the downlink and uplink bidirectional | two-way wireless relay of the wireless relay system which concerns on embodiment. (A)-(d) is a figure which shows the frequency characteristic of the signal of a downlink and an uplink in the wireless relay system of FIG. 5, and the characteristic BPF of a bandpass filter. (A), (b) and (c) are respectively between the fixed base station and the first radio relay station (master unit), the first radio relay station (master unit) and the second radio relay station (slave unit). Explanatory drawing which shows the mode of a frequency utilization between 2nd and between a 2nd wireless relay station (slave unit) and a mobile station. (A) And (b) is a block diagram which shows the structural example of the frequency converter in the 1st radio relay station (master | base_unit) of FIG. 5, respectively. The block diagram which shows one structural example of the 2nd wireless relay station (slave unit) corresponding to the downlink and uplink bidirectional | two-way wireless relay of the wireless relay system which concerns on embodiment. (A)-(d) is a figure which shows the frequency characteristic of the signal of a downlink and an uplink, and the characteristic BPF of a band filter in the radio relay system of FIG. (A) And (b) is a block diagram which shows the structural example of the frequency converter in the 2nd radio relay station (slave unit) of FIG. 9, respectively. The block diagram which shows the other structural example of the 1st wireless relay station (master | base_station) corresponding to the downlink and uplink bidirectional | two-way wireless relay of the wireless relay system which concerns on embodiment. (A) And (b) is a block diagram which respectively shows the structural example of the frequency converter of each downlink corresponding to the communication operator A in the 1st radio relay station (master | mobile_unit) of FIG. (A) And (b) is a block diagram which respectively shows the structural example of the frequency converter of each downlink corresponding to the communication operator B in the 1st radio | wireless relay station (base station) of FIG. The block diagram which shows the other structural example of the 2nd wireless relay station (slave unit) corresponding to the downlink and uplink bidirectional | two-way wireless relay of the wireless relay system which concerns on embodiment. (A) And (b) is a block diagram which respectively shows the structural example of the frequency converter of each downlink corresponding to the communication operator A in the 2nd wireless relay station (slave unit) of FIG. (A) And (b) is a block diagram which respectively shows the structural example of the frequency converter of each downlink corresponding to the communication operator B in the 2nd radio relay station (slave unit) of FIG. The time chart which shows an example of switching control of the communication operator of the radio relay object in the radio relay system which concerns on embodiment. The time chart which shows the other example of switching control of the communication operator of the radio relay object in the radio relay system which concerns on embodiment. (A) And (b) is explanatory drawing which shows an example of the remote switching control of the communication operator of the wireless relay object in the wireless relay system which concerns on embodiment, respectively. (A) And (b) is explanatory drawing which shows the relationship between the transmission power and the total transmission power between a main | base station and a subunit | mobile_unit (uplink / downlink) in the wireless relay system of a comparative example and embodiment, respectively. (A) And (b) is explanatory drawing which shows the relationship between the transmission power and the total transmission power between a subunit | mobile_unit and a mobile station (downlink) in the wireless relay system of a comparative example and embodiment, respectively. Explanatory drawing explaining the advantage of the wireless relay system which concerns on embodiment. (A) And (b) is explanatory drawing explaining the other advantage of the wireless relay system which concerns on embodiment. Explanatory drawing explaining the further another advantage of the radio relay system which concerns on embodiment. (A) And (b) is explanatory drawing explaining the further another advantage of the wireless relay system which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram illustrating an example of an overall configuration of a communication system including a wireless relay system according to an embodiment of the present invention. The wireless relay system according to the present embodiment has a simple configuration and, after moving to a target position, promptly starts relaying wireless communication between a fixed base station and a user device for a mobile communication network of a plurality of communication operators. This is a temporary radio relay system using a time division relay system.

  In FIG. 1, the radio relay system according to the present embodiment includes a first radio relay station (hereinafter also referred to as “master unit”) 10 and a second radio relay station (hereinafter also referred to as “slave unit”) 20. . The first radio relay station (base unit) 10 and the second radio relay station (slave unit) 20 are connected to the mobile communication networks 80A and 80B of a plurality of communication operators (communication carriers) A and B having different radio signal frequencies. Wireless communication between a plurality of fixed base stations 30A, 30B such as macro cell base stations connected to each of the core networks and a plurality of mobile stations 40A, 40B as user apparatuses corresponding to the plurality of communication operators A, B, respectively Are relayed simultaneously. The master unit 10 and the slave unit 20 are time-synchronized with each other using a received signal from a GPS satellite.

  In the present embodiment, the case where the number of communication operators (fixed base stations) is two will be described, but the number of communication operators (fixed base stations) may be three or more. In FIG. 1, the number of mobile stations corresponding to each of the communication operators A and B is 1, but the number of mobile stations corresponding to each of the communication operators A and B may be two or more.

  The mobile communication networks 80A and 80B may be provided with remote control devices 81A and 81B (control sources), respectively. The remote control devices 81A and 81B hold, for example, information on the first radio relay station 10 and the second radio relay station 20, and transmit control information to at least one of the first radio relay station 10 and the second radio relay station 20. be able to. The remote control devices 81A and 81B may function as information transmission destinations and receive information from at least one of the first radio relay station 10 and the second radio relay station 20. The remote control devices 81A and 81B may be provided in addition to the mobile communication networks 80A and 80B as long as they can communicate with the first radio relay station 10 and the second radio relay station 20. The control of the first radio relay station 10 and the second radio relay station 20 may be performed by both the remote control devices 81A and 81B, or may be performed by either one of the remote control devices 81A and 81B. Good. The remote control device 81C may be installed on a common network 80C other than the mobile communication networks 80A and 80B of the respective communication operators. The remote control devices 81A, 81B, 81C are, for example, servers, PCs, or tablet terminals that can communicate with the first radio relay station 10 or can communicate with the first radio relay station 10 and the second radio relay station 20. There may be.

  The first radio relay station 10 is also referred to as a first frequency to be relayed to the fixed base stations 30A and 30B (hereinafter referred to as “radio relay frequency” or “base station side frequency”) for each of the communication operators A and B. ) F1A (downlink signal) and F1A ′ (uplink signal) (hereinafter collectively referred to as “F1A / F1A ′”) and F1B (downlink signal) and F1B ′ (uplink signal) (hereinafter collectively referred to as “F1B / F2 (downlink signal) and F2 ′ (hereinafter also referred to as “intermediate frequency”) common to communication operators between the radio signal of “F1B ′” and the second radio relay station 20. Uplink signal) (hereinafter collectively referred to as “F2 / F2 ′”) is a frequency conversion type radio relay device that relays radio signals, and is mounted on the vehicle 50, which is a vehicle, to achieve ground targets. Can move to a position.

In the wireless relay system of the present embodiment, when different wireless relay frequencies (second frequency and intermediate frequency) set for each communication operator are used for relaying wireless communication between a fixed base station and a mobile station of a plurality of communication operators. There are the following problems.
For example, the number of communication operators is 3, the first frequency of the communication operator 1 is F1-1 (bandwidth B1, 2 × B1 for the upper and lower lines), and the first frequency of the communication operator 2 is F1-2 (bandwidth B2 When the first frequency of the communication operator 3 is F1-3 (bandwidth B3, 2 × B3 for the upper and lower lines), the radio relay frequency after the frequency conversion (second frequency, intermediate frequency) ) Requires 2 × (B1 + B2 + B3) on the upper and lower lines. Specifically, if B1 = B2 = B3 = 20 MHz, 2 × (20 Mz + 20 Mz + 20 Mz) = 120 MHz is required. In general, if there are N communication operators and the bandwidth of each communication operator is B [MHz], N × (2 × B) = 2 · N · B [MHz] is required for the upper and lower lines.

  If the radio relay frequency is not assigned to the communication operator, it is necessary to assign a new frequency such as 2 · N · B on the upper and lower lines, and generally assigning such many frequencies. It is difficult.

  Also, assuming that the transmission power of the radio relay frequency of one communication operator is Pm, when transmitting a plurality of communication operators (number of communication operators: N) at the same time, N × from the master unit to the slave unit of the radio relay system Pm transmission power is required. Similarly, transmission power of N × Pm is required from the child device to the parent device.

  Conversely, if the total transmission power of the radio relay frequency from the parent device to the child device and from the child device to the parent device is PM, the transmission power of one communication operator is reduced to Pm = PM / N, and wireless relay communication The distance becomes smaller.

  For the service link from the slave unit to the mobile station, if the transmission power of each of the N communication operators is Ps, N × Ps transmission power is required. On the other hand, if the total transmission power of the service link from the slave unit to the mobile station is PS, the transmission power of one communication operator is reduced to Ps = PS / N, and the wireless relay service area is reduced.

  Therefore, in this embodiment, as shown below, by using a time division relay method for wireless relay of a plurality of communication operators, while securing a predetermined band for the frequency band of each service link of the plurality of communication operators, The frequency band used for wireless relay of a plurality of communication operators is suppressed, and the relay distance between the master unit and the slave unit and the service area between the slave unit and the mobile station are increased.

The bandwidth of the second frequency F2 / F2 ′ common to the communication operators used for the wireless relay between the first wireless relay station 10 and the second wireless relay station 20 is necessary for the wireless communication of the communication operators A and B. Is set to the maximum bandwidth Bmax (= Max [B _A , B _B ]) among a plurality of communication bands B _A , B _B. When the number of communication operators to be wirelessly relayed is N and the communication band of the i-th (i = 1, 2, ---, N) communication operator is Bi, the wireless communication of each of the plurality of communication operators It is set to the maximum bandwidth Bmax (= Max [B1, B2, ---, BN]) among a plurality of required communication bands Bi (i = 1, 2, ---, N). In the case of FDD (frequency division duplex) using different frequencies on the uplink and downlink of the service link, the bandwidth of the entire common second frequency F2 / F2 ′ is set to 2 × Bmax. By setting the bandwidth of the entire common second frequency F2 / F2 ′ in this way, a predetermined bandwidth is secured for the frequency bands of the service links of the plurality of communication operators, and wireless relaying of the plurality of communication operators is performed. The bandwidth of the frequency to be used (second frequency F2 / F2 ′) can be reduced to 1 / N (N: the number of communication operators to be relayed) when wirelessly relaying at different frequencies for each communication operator. Note that the time during which each of the plurality of communication operators can communicate is limited to the time allocated in a time division manner, but there is no particular problem in the case of short packet communication such as transmission / reception of position information. In addition, it is possible to avoid a reduction in communication quality by retransmission processing when a transmission / reception error occurs.

  The vehicle 50 on which the first wireless relay station 10 is mounted includes a battery, a generator, or the like that can supply power to the first wireless relay station 10 for a long time, such as an electric vehicle, a hybrid vehicle, and a fuel cell vehicle. It may be. In the configuration example of FIG. 1, the first wireless relay station 10 is incorporated in the automobile 50, but the moving body in which the first wireless relay station 10 is incorporated is a vehicle other than the automobile traveling on the road. Alternatively, it may be a railway vehicle traveling on a track, an aircraft, a ship on a river or the sea, and the like. In addition, the moving body in which the first radio relay station 10 is incorporated is a flying body that stays or moves in a predetermined airspace by autonomous control or by external control, such as a small helicopter (for example, drone) that can be remotely controlled. Also good.

  The second radio relay station 20 has, for each of the communication operators A and B, a radio signal of the second frequency (intermediate frequency) F2 / F2 ′ common to the first radio relay station 10, mobile stations 40A and 40B, Frequency conversion type radio relay that relays the first frequency (hereinafter also referred to as “radio relay frequency” or “mobile station side frequency”) F1A / F1A ′, F1B / F1B ′ radio signals The device can be positioned higher than the first radio relay station 10 by being mounted on a flying body 70 such as a drone that stays or moves in a predetermined airspace by autonomous control or by external control. In this case, the automobile 50 on which the first radio relay station 10 is mounted may include a takeoff / departure unit on which the flying object 70 can take off / depart.

  Further, as shown in FIG. 2, the second radio relay station 20 may be mounted on a balloon 60 such as a moored balloon. Balloon 60 is a dead zone, a mountain area, a marine area where obstacles such as mountains and high-rise buildings that obstruct the propagation of radio communication radio waves exist between antennas 31A and 31B of fixed base stations 30A and 30B. You may install in the sky above weak electric field areas. The balloon 60 is supported by being moored by a mooring line (main mooring line) extending upward from the anchor base on the ground so as to be disposed at a position of several tens to several hundreds m from the ground, for example. The anchor base only needs to be able to anchor the balloon 60 by fixing the lower end of the mooring line (main mooring line), and is not limited to a specific shape or size. The balloon 60 may be moored in the automobile 50 on which the first radio relay station 10 is mounted as an anchor base. Further, when the balloon 60 is disposed above the sea, the anchor base may be provided on a sea buoy or a ship.

  First frequency (relay target frequency) F1A / F1A ′, F1B / F1B ′ and a common second frequency (intermediate frequency) to be converted for each of the communication operators A and B in the first radio relay station 10 and the second radio relay station 20, respectively. ) F2 / F2 ′ is a frequency different from each other so that no wraparound interference occurs between radio signals transmitted / received by the first radio relay station 10 and no wraparound interference occurs between radio signals transmitted / received by the second radio relay station 20. . For example, the first frequencies (relay target frequencies) F1A / F1A ′ and F1B / F1B ′ are frequencies in the 2.1 GHz band, and the second frequency (intermediate frequency) F2 / F2 ′ common to the communication operators A and B is 3 It may be a frequency of 3 GHz band.

  FIG. 3 is a block diagram illustrating an example of a main configuration of the first radio relay station 10 of the radio relay system according to the embodiment. In FIG. 3, the first radio relay station 10 includes a first radio communication unit 11, a second radio communication unit 12, a frequency conversion unit 13, and a control unit 14 that controls each unit.

  The first wireless communication unit 11 receives the first frequency (relay target frequency) F1A / F1A ′, F1B that is the base station side frequency with the fixed base stations 30A, 30B via the first antenna 101 for the fixed base station. / F1B ′ radio signal is transmitted and received. The second radio communication unit 12 transmits and receives radio signals of the second frequency (intermediate frequency) F2 / F2 ′ to and from the second radio relay station (slave unit) 20 via the second antenna 102 for the radio relay station. To do. Each of the first wireless communication unit 11 and the second wireless communication unit 12 may include an amplifier (for example, a low noise amplifier for reception and a power amplifier for transmission). The first wireless communication unit 11 and the second wireless communication unit 12 have a function of adjusting the signal power after frequency conversion to be equal between the plurality of communication operators A and B for each of the communication operators A and B. May be.

  The frequency conversion unit 13 uses a second frequency F2 common to the first frequencies F1A / F1A ′ and F1B / F1B ′ between the first wireless communication unit 11 and the second wireless communication unit 12 for each of the communication operators A and B. Perform frequency conversion with / F2 '. For example, the frequency conversion unit 13 converts a first frequency F1A / F1A ′, F1B / F1B ′ to a second frequency F2 / F2 ′, and a second frequency F2 / F2 ′ to the first frequency F1A / F1A. A frequency converter that converts to ', F1B / F1B' may be used.

  The radio signal relayed by the first radio relay station 10 may be transmitted / received by using, for example, an OFMDA communication method compliant with LTE or LTE-Advanced standards. In this case, good communication quality can be maintained even if multipaths with different radio signal delays occur.

  The first antenna 101 of the first radio relay station 10 may be an omnidirectional antenna, or a plurality of directivities whose directivity directions can be adjusted in the directions of the fixed base stations 30A and 30B of the plurality of communication operators A and B, respectively. May be a sex antenna. Further, the first antenna 101 of the first radio relay station 10 may be a directional antenna whose direction can be controlled so as to track the fixed base stations 30A and 30B of the communication operators A and B, or a fixed base station. It may be an adaptive antenna (for example, an adaptive array antenna) composed of a plurality of elements capable of forming a beam so as to track each of the stations 30A and 30B.

  The second antenna 102 of the first radio relay station 10 may be an omnidirectional antenna or a directional antenna whose direction can be controlled so as to track the second radio relay station 20, or the second radio relay. An adaptive antenna (for example, an adaptive array antenna) composed of a plurality of elements capable of forming a beam so as to track the station 20 may be used.

  The control unit 14 can control each unit by executing a program incorporated in advance.

  When receiving control information from the remote control devices 81A and B (control sources) of the communication operators A and B of the plurality of mobile communication networks 80A and B or transmitting information to the remote control devices 81A and B A control communication device 15 connected to the control unit 14 may be provided. The control communication device 15 may be, for example, a user terminal (mobile station) such as a mobile communication module that can be easily incorporated into the device, or a wireless communication device capable of communicating with the second wireless relay station 20 by wireless communication such as WiFi. It may be.

  For example, the control unit 14 receives control information transmitted from the remote control devices 81A and 81B via the fixed base stations 30A and 30B by the control communication device 15, and based on the control information, the communication operator A or Control may be performed so that only the wireless relay function of B or the wireless relay functions of both communication operators A and B is turned ON / OFF. Further, the control unit 14 is a circuit related to the wireless communication of the first wireless relay station 10 and the second wireless relay station of the communication operator that does not perform wireless relaying among the plurality of communication operators A and B so as not to use unnecessary power. Control may be performed to turn off all the power. In addition, the control unit 14 transmits the relay switching instruction information or the relay switching schedule information of the communication operators A and B transmitted from the remote control devices 81A and 81B or other common remote control devices via the fixed base stations 30A and 30B. Is transmitted by the control communication device 15, and based on the relay switching instruction information or the relay switching schedule information, the wireless communication of the communication operators A and B with the second wireless relay station (slave unit) 20 is performed in a time-sharing manner. You may control to switch and relay. Here, communication between the remote control device and the control communication device 15 is performed using, for example, IP addresses (or telephone numbers or MAC addresses) assigned to the remote control device and the control communication device 15 respectively. Good.

  Further, the control unit 14 communicates with the second radio relay station (slave unit) 20 based on the relay switching instruction information input and set in real time in the first radio relay station (base unit) 10 by manual operation or the like. Control is performed so that the wireless communications of the communication operators A and B are switched in a time-sharing manner, and relay switching instruction information is transmitted to the second wireless relay station (slave unit) 20 via the control communication device 15 ( Transfer). In addition, the control unit 14 transmits the relay switching schedule information of the communication operators A and B received from the remote control devices 81A and 81B or other common remote control devices via the control communication device 15 to the second wireless relay station ( You may transmit (transfer) to the subunit | mobile_unit 20.

  Further, the control unit 14 transmits at least one of transmission and reception of radio signals to and from the fixed base stations 30A and 30B including the first frequencies F1A / F1A ′ and F1B / F1B ′ via the control communication device 15. Information indicating the situation and the position information of the radio relay station, the situation of at least one of transmission and reception of radio signals to / from the second radio relay station 20 having the second frequency F2 / F2 ′, and the position information of the radio relay station May be transmitted to the remote control devices 81A, B of the communication operators A, B of mobile communication or other common remote control devices. For example, the operator of mobile communication turns on / off the signal to the second radio relay station 20 by turning on / off the radio relay function of the first radio relay station 10 based on the received radio relay information. If it is predicted that interference will occur in the service area of other fixed base stations, it can be set to OFF so as not to cause interference, or a signal to the second radio relay station 20 can be transmitted. It can be controlled so that noise does not increase by turning it off. For example, when it is not necessary to transmit a radio wave until the drone arrives at the relay place, it is possible to turn off the control so that the radio wave is not transmitted.

  FIG. 4 is a block diagram illustrating an example of a main part configuration of the second radio relay station 20 of the radio relay system according to the embodiment. 4, the second radio relay station 20 includes a first radio communication unit 21, a second radio communication unit 22, a frequency conversion unit 23, and a control unit 24 that controls each unit.

  The first radio communication unit 21 transmits and receives a radio signal of the second frequency (intermediate frequency) F2 / F2 ′ to and from the first radio relay station 10 via the first antenna 201 for the radio relay station. The second wireless communication unit 22 transmits the first frequency (relay target frequency) F1A / F1A ′ and F1B / F1B, which are the mobile station side frequencies, to and from the mobile stations 40A and 40B via the second antenna 202 for the mobile station. Send and receive 'radio signals. The first radio communication unit 21 and the second radio communication unit 22 may each include an amplifier (for example, a low noise amplifier for reception and a power amplifier for transmission). The first wireless communication unit 21 and the second wireless communication unit 22 have a function of adjusting the signal power after frequency conversion to be equal between the plurality of communication operators A and B for each of the communication operators A and B. May be.

  The frequency converter 23 is a second frequency F2 that is common to the first frequencies F1A / F1A ′ and F1B / F1B ′ between the first radio communication unit 21 and the second radio communication unit 22 for each of the communication operators A and B. Perform frequency conversion with / F2 '. For example, the frequency converter 23 converts the first frequencies F1A / F1A ′ and F1B / F1B ′ into a common second frequency F2 / F2 ′, and the second frequency F2 / F2 ′ as the first frequency F1A. You may comprise using the frequency converter which converts into / F1A 'and F1B / F1B'.

  The radio signal relayed by the second radio relay station 20 may be transmitted / received using, for example, an OFMDA communication system that conforms to the LTE or LTE-Advanced standard. In this case, the radio signal received from the fixed base station and the radio signal received from the second radio relay station 20 are equivalent to multipaths having different delays, and good communication quality is maintained by receiving radio signals of a plurality of paths. it can.

  The first antenna 201 of the second radio relay station 20 may be a directional antenna whose direction can be controlled so as to track the first radio relay station 10, or so as to track the first radio relay station 10. It may be an adaptive antenna (for example, an adaptive array antenna) composed of a plurality of elements capable of forming a beam.

  The control unit 24 can control each unit by executing a preinstalled program.

  In addition, control information from the remote control devices 81A, 81B or other common remote control devices of the communication operators A, B of the plurality of mobile communication networks 80A, 80B is received, or the remote control devices 81A, 81B or other common control devices are received. When transmitting information to the remote control device, a control communication device 25 connected to the control unit 14 connected to the control unit 24 may be provided. The control communication device 25 may be, for example, a user terminal (mobile station) 25 such as a mobile communication module that can be easily incorporated into the device, or can communicate with the second wireless relay station 20 by wireless communication such as WiFi. A simple wireless communication device may be used.

  The control unit 24 receives, for example, control information transmitted from the remote control devices 81A and 81B or other common remote control devices via the fixed base stations 30A and 30B and the wireless relay system by the control communication device 25. Based on the control information, only the wireless relay function of the communication operator A or B or the wireless relay functions of both the communication operators A and B may be controlled to be turned on / off. In addition, the control unit 24 controls to turn off all the circuits related to the wireless communication of the second wireless relay station 20 of the communication operator that does not perform wireless relaying among the plurality of communication operators A and B so that unnecessary power is not used. May be performed. In addition, the control unit 24 transmits the relay switching instruction information or relay switching schedule information of the communication operators A and B transmitted from the remote control devices 81A and 81B or other common remote control devices via the fixed base stations 30A and 30B. Is transmitted by the control communication device 25, and based on the relay switching instruction information or relay switching schedule information, the wireless communication of the communication operators A and B with the first wireless relay station (master unit) 10 is performed in a time-sharing manner. You may control to switch and relay. Here, the communication between the remote control device and the control communication device 25 is performed using, for example, IP addresses (or telephone numbers or MAC addresses) assigned to the remote control device and the control communication device 25, respectively. Good.

  In addition, the control unit 24 receives the relay switching information or the relay switching schedule information of the communication operators A and B set in the first radio relay station (master unit) 10 by the control communication device 25, and the relay switching information or Based on the relay switching schedule information, the wireless communication of the communication operators A and B with the first wireless relay station (master unit) 10 may be controlled to be switched in a time-sharing manner. In this case, the control unit 14 of the first radio relay station 10 serving as the master unit is the main control device (master), and the control unit 24 of the second radio relay station 20 serving as the slave unit is the sub-control device (slave). The control unit 14 of the machine controls the control unit 24 of the child machine. Based on the control information (relay switching instruction information or relay switching schedule information) from the control unit 14 of the master unit, the communication operators of the first radio relay station (master unit) 10 and the second radio relay station (slave unit) 20 are switched. Can be done simultaneously.

  In addition, the control unit 24 transmits at least one of the situation of radio signal transmission and reception with the first radio relay station 10 having the common second frequency F2 / F2 ′ and radio via the control communication device 25. Radio relay information indicating the position information of the relay station, at least one situation of transmission and reception of radio signals between the mobile stations 40A and 40B having the first frequencies F1A / F1A ′ and F1B / F1B ′, and the radio relay station The wireless relay information indicating the position information may be transmitted to the remote control devices 81A and 81B of the mobile communication operator or other common remote control device.

  FIG. 5 is a block diagram illustrating a configuration example of the first radio relay station (master unit) 10 that supports downlink and uplink bidirectional radio relay of the radio relay system according to the embodiment. This configuration example is an example in which a plurality of directional antennas 101A and 101B are used as the first antenna on the fixed base station side. In FIG. 5, the same parts as those in FIG.

FIGS. 6A to 6D are diagrams illustrating frequency characteristics of downlink and uplink signals in the wireless relay system of FIG.
FIG. 6A shows the first frequencies F1A and F1B of the communication operators A and B received by the first antennas 101A and 101B in the downlink signal processing path of the first radio relay station (master unit) 10 in FIG. It is a figure which shows the frequency characteristic of received signal S _R1A and S _R1B .
6 (b) is a graph showing the frequency characteristics of the transmission signal S _T2 of the second frequency F2 after frequency conversion in the downlink signal processing path of the first radio relay station (base unit) 10 of FIG.
FIG. 6C shows the received signal S of the second frequency F2 ′ of each of the communication operators A and B received by the second antenna 102 in the uplink signal processing path of the first radio relay station (master unit) 10 of FIG. It is a figure which shows the frequency characteristic of _{R2 '} .
FIG. 6D shows the transmission signals S _{T1A ′} and S _{T1B ′} of the first frequencies F1A ′ and F1B ′ after frequency conversion in the uplink signal processing path of the first radio relay station (master unit) 10 of FIG. It is a figure which shows the frequency characteristic.

7 (a), 7 (b), and 7 (c), respectively, between the fixed base stations 30A and 30B and the first radio relay station (parent device) 10, the first radio relay station (parent FIG. 4 is an explanatory diagram showing how frequencies are used between the second radio relay station (slave unit) 20 and the second radio relay station (slave unit) 20 and the mobile stations 40A and 40B. As shown in FIG. 7 (a) and FIG. 7 (c), different frequencies F1A, F1A ′, F1B, F1B ′ of the communication bands B _A and B _B for the downlink and uplink of the communication operators A and B, respectively. Are allocated and a total bandwidth of 2 × B _A + 2 × B _B is used, the number of wireless relays between the first wireless relay station (master unit) 10 and the second wireless relay station (slave unit) 20 is The band used in the two frequencies F2 and F2 ′ can be reduced to ½ (= B _A + B _B ) of the band (2 × B _A + 2 × B _B ) of the allocated frequency.

  In FIG. 5, the first antenna on the fixed base station side includes a plurality of directional antennas 101A and 101B having directivity directed to the fixed base stations 30A and 30B of a plurality of communication operators. Each of the directional antennas 101A and 101B has directivity so as to track each of the fixed base stations 30A and 30B of the plurality of communication operators A and B after the first radio relay station (master unit) 10 moves to the destination. It is configured so that the orientation can be adjusted. Note that the directional antennas 101A and 101B are a plurality of communication operators A and B based on position information and attitude information of the vehicle 50 equipped with the first radio relay station (master unit) 10 and the directional antennas 101A and 101B. The direction of directivity may be configured to be automatically controllable so as to track each of the fixed base stations 30A and 30B.

  The first radio communication unit 11 is a plurality of DUPs 110A and 110B, a downlink radio relay switching unit 118D which is a downlink reception signal processing unit on the fixed base station side, and an uplink transmission signal processing unit on the fixed base station side An uplink radio relay switching unit 118U.

  The downlink radio relay switching unit 118D includes a band filter 114A for the communication operator A and an amplifier 111A having an automatic gain control (AGC) function, and a band filter 114B for the communication operator B and an amplifier having an automatic gain control (AGC) function. 111B and a communication operator switching unit 115. Band-pass filters (BPF) 114A and 114B selectively pass the frequencies F1A and F1B of the downlink signals of the communication operators A and B, respectively. The amplifiers 111A and 111B set the received signal power of the radio relay frequencies F1A and F1B of the communication operators A and B that have passed through the band-pass filters (BPF) 114A and 114B to a predetermined power Pr, respectively.

The band filter 114A selectively passes the reception signal S _R1A of the first frequency F1A of the communication operator A among the downlink reception signals S _R1A and S _R1B of the communication operators A and B shown in FIG. a band pass filter, bandpass filter 114B is a bandpass filter for selectively passing the received signal S _R1B the first frequency F1B communication operator B.

  The communication operator switching unit 115 is configured by a switch that can be switched by a control signal from the control unit 14, for example, and based on the relay switching instruction information or relay switching schedule information of the communication operators A and B, Control is performed so as to switch to a path passing through the filter 114A and the amplifier 111A, or a path passing through the bandpass filter 114B and the amplifier 111B.

  The uplink radio relay switching unit 118U includes a band filter 116A and an amplifier 117A for the communication operator A, a band filter 116B and an amplifier 117B for the communication operator B, and a communication operator switching unit 119. Band-pass filters (BPF) 116A and 116B selectively pass the frequencies F1A 'and F1B' of the uplink signals of the communication operators A and B, respectively. The amplifiers 117A and 117B amplify the transmission signals of the radio relay frequencies F1A ′ and F1B ′ of the communication operators A and B that have passed through the band-pass filters (BPF) 116A and 116B, respectively, to a predetermined power (signal level).

Further, the band filter 116A is a communication operator among the uplink transmission signals S _{T1A ′} and S _{T1B ′} of the first frequencies F1A ′ and F1B ′ after the frequency conversion of the communication operators A and B shown in FIG. a bandpass filter for selectively passing a 'transmission signal _{S T1A'} of the first frequency F1A of a, bandpass filter 116B is selectively passes 'transmission signal _{S T1B'} of the first frequency F1B communication operator B It is a band pass filter to be made.

  The communication operator switching unit 119 is configured by a switch that can be switched by a control signal from the control unit 14, and based on the relay switching instruction information or relay switching schedule information of the communication operators A and B, the downlink signal path is changed to a band filter. It is controlled to switch to a path passing through 116A and amplifier 117A, or a path passing through band-pass filter 116B and amplifier 117B.

  The communication operator switching units 115 and 119 and the control unit 14 perform control so as to switch and relay the wireless communication of the plurality of communication operators A and B in a time division manner with the second wireless relay station (slave unit) 20. It constitutes a switching control means.

In FIG. 5, the frequency converter 13 includes a downlink frequency converter 131 and an uplink frequency converter 132. The frequency converter 131 converts the first frequencies F1A and F1B of the received signals S _R1A and S _R1B into a common second frequency F2 that is an intermediate frequency for relaying the master unit and the slave unit in the downlink signal processing path. On the other hand, the frequency converter 132, the master unit in the uplink signal processing path - first frequency F1A for fixed base station _'second frequency F2' of an intermediate frequency of the handset relay transmission signal S _T2 ', F1B Convert to '.

FIGS. 8A and 8B are block diagrams showing configuration examples of the frequency converters 131 and 132 in the first radio relay station (master unit) 10 of FIG.
The downlink frequency converter 131 in FIG. 8A includes a local oscillator 1311 and a frequency mixer 1312 and is output to the output filter 126 in FIG. The pass band of the output filter 126 is set so that the common second frequency (intermediate frequency) F2 passes. In the local oscillator 1311, the control unit 14 switches the local oscillation frequency in a time-sharing manner according to the time when the communication operator communicates based on the relay switching instruction information or relay switching schedule information of the communication operators A and B. Specifically, when relaying the communication operator A's wireless communication, the local oscillation frequency is set to F2-F1A, and when relaying the communication operator B's wireless communication, the local oscillation frequency is set to F2-F1B. Be controlled. The signal of the local oscillation frequency and the downlink signal (F1A or F1B) whose settings are switched in this way are mixed by the frequency mixer 1312. The frequency of the signal output from the output filter 126 of FIG. 5 becomes the common second frequency (intermediate frequency) F2 regardless of which of the downlink signals of the communication operators A and B is input.

  Further, the uplink frequency converter 132 of FIG. 8B includes a local oscillator 1321 and a frequency mixer 1322. The pass band of the output filter 116A or 116B in FIG. 5 is set so that the first frequencies F1A 'and F1B' of the uplink signals of the communication operators A and B pass. In the local oscillator 1321, the control unit 14 switches the local oscillation frequency in a time-sharing manner according to the communication time of the communication operator based on the relay switching instruction information or the relay switching schedule information of the communication operators A and B. Specifically, the local oscillation frequency is set to F1A'-F2 when relaying the communication operator A's wireless communication, and the local oscillation frequency is set to F1B'-F2 when relaying the communication operator B's wireless communication. Is controlled to be switched. The local oscillation frequency signal thus switched and the relay signal of the second frequency (intermediate frequency) F are mixed by the frequency mixer 1322, and the output is output to the output filter 116A or 116B in FIG. The frequency of the signal output from the output filter 116A or 116B is switched to F1A 'or F1B' according to the communication time of the communication operators A and B.

In FIG. 5, the second wireless communication unit 12 includes a DUP 120, a downlink reception signal processing unit on the slave unit side, and an uplink transmission signal processing unit on the slave unit side. The DUP 120 performs path separation between the uplink path of the reception signal received by the second antenna 102 and the downlink path of the transmission signal transmitted by the second antenna 102.
The downlink reception signal processing unit on the handset side includes band filters 126 and amplifiers (for example, linear amplifiers) 127 for communication operators A and B.
The uplink transmission signal processing unit on the handset side includes an amplifier 121 with automatic gain control (AGC) function for reception, and band filters 124 for communication operators A and B.

The band filter 124 is a band pass filter that selectively passes the uplink reception signal _{SR2 ′} of the second frequency F2 before frequency conversion common to the communication operators A and B shown in FIG. 6C. Further, the bandpass filter 126 is a bandpass filter which passes a downlink transmission signal S _T2 of the second frequency F2 after common frequency converting communication operator A, the B as shown in Figure 6 (b).

When relaying uplink wireless communication from the mobile stations 40A and 40B to the fixed base stations 30A and 30B in the first wireless relay station (master unit) 10 of the configuration example of FIG. The common received signal S _{R2 ′} received from the apparatus 20 through the band filter 124 of the second wireless communication unit 12 is amplified by the amplifier 121 and then output to the frequency converter 132. . The received signals S _{R1A ′} and S _{R1B ′} converted from the common second frequency F2 ′ to the first frequencies F1A ′ and F1B ′ by the frequency converter 132 are supplied to the band filters 116A and 116B of the first radio communication unit 11, respectively. Unnecessary signals are passed through and amplified to a predetermined same power Pr (signal level) by the amplifiers 117A and 117B, and then transmitted as signals T _{T1A ′} and S _{T1B ′} as DUPs 110A and 110B and the first antenna 101A, It is transmitted toward the mobile base stations 30A and 30B via 101B.

  Further, in the first radio relay station (master unit) 10 of the configuration example of FIG. 5, when relaying downlink radio communication from the fixed base stations 30A, 30B to the mobile stations 40A, 40B, the fixed base of the communication operator A The downlink radio signal having the first frequency F1A transmitted from the station 30A is received by the directional antenna 101A directed toward the fixed base station 30A, and input to the downlink radio relay switching unit 118D via the DUP 110A. The On the other hand, the downlink radio signal of the first frequency F1B transmitted from the fixed base station 30B of the communication operator B is received by the directional antenna 101B directed toward the fixed base station 30B, and is transmitted via the DUP 110B. The data is input to the link wireless relay switching unit 118D.

In the downlink radio relay switching unit 118D, the reception signals S _R1A and S _R1B of the first frequencies F1A and F1B of the respective communication operators A and B are passed through the band filters 114A and 114B, unnecessary signals are removed, and the amplifier 111A , 111B, and passes through the communication operator switching unit 115 in a time division manner, and then is output to the frequency converter 131. The received signal S _R2 converted from the first frequencies F1A and F1B to the common second frequency F2 by the frequency converter 131 passes through the band filter 126 of the second radio communication unit 12 and an unnecessary signal is removed. After being amplified to a predetermined power (signal level) at 127, it is transmitted to the slave unit 20 via the second antenna 102 as a downlink relay transmission signal _ST2 .

  FIG. 9 is a block diagram illustrating a configuration example of the second radio relay station (slave unit) 20 corresponding to downlink and uplink bidirectional radio relay of the radio relay system according to the embodiment. This configuration example is used in combination with the first radio relay station (master unit) 10 of FIG. 5, and omnidirectional antennas are used for the first antenna 201 on the master unit side and the second antenna 202 on the mobile station side, respectively. It is an example. In FIG. 9, the same parts as those in FIG.

FIGS. 10A to 10D are diagrams illustrating frequency characteristics of downlink and uplink signals in the wireless relay system of FIG.
FIG. 10A shows a received signal of the second frequency F2 common to the respective communication operators A and B received by the first antenna 201 in the downlink signal processing path of the second radio relay station (slave unit) 20 of FIG. It is a figure which shows the frequency characteristic of S _R2A and S _R2B .
FIG. 10B is a diagram illustrating the frequency characteristics of the transmission signals S _T1A and S _T1B of the first frequencies F1A and F1B after frequency conversion in the downlink signal processing path of the second radio relay station (slave unit) 20 of FIG. It is.
FIG. 10C shows the first frequencies F1A ′ and F1B ′ of the communication operators A and B received by the second antenna 202 in the uplink signal processing path of the second radio relay station (slave unit) 20 of FIG. It is a figure which shows the frequency characteristic of receiving signal S _{R1A '} and S _R1B' .
Figure 10 (d) is a diagram showing the frequency characteristic of the 'transmission signal S _{T2 of'} common second frequency F2 of the second wireless relay station (slave device) after frequency conversion in 20 of the uplink signal processing path 9 is there.

In FIG. 9, the first wireless communication unit 21 includes a DUP 210, a downlink reception signal processing unit on the parent device side, and an uplink transmission signal processing unit on the parent device side. The DUP 210 performs path separation between the downlink path of the reception signal received by the first antenna 201 and the uplink path of the transmission signal toward the first antenna 201.
The downlink reception signal processing unit on the base unit side includes an amplifier 211 with automatic gain control (AGC) function for reception and a band filter 214.
The uplink transmission signal processing unit on the base unit side includes a common band filter 216 and an amplifier (for example, a linear amplifier) 217 for the second frequency F2 ′.

Bandpass filter 214 is a bandpass filter for selectively passing the received signal S _R2 downlink having a second frequency F2 of the common communication operators A, B shown in Figure 10 (a).

Further, the bandpass filter 216 is a bandpass filter which passes 10 communication operator A shown in (d), 'transmission signal S _{T2 uplink'} common second frequency F2 of the frequency-converted into B.

In FIG. 9, the frequency conversion unit 23 includes a downlink frequency converter 231 and an uplink frequency converter 232. Frequency converter 231 converts the second frequency F2 of the received signal _{S R2} in the downlink signal processing path the mobile station corresponding to the first frequency F1A, the F1B. On the other hand, the frequency converter 232 transmits the first frequencies F1A ′ and F1B ′ of the transmission signals S _{T1A ′} and S _{T1B ′} corresponding to the mobile station in the uplink signal processing path with a common intermediate frequency for relaying the master unit and the slave unit. Conversion to a certain second frequency F2 ′.

FIG. 11A and FIG. 11B are block diagrams showing configuration examples of the frequency converters 231 and 232 in the second radio relay station (slave unit) 20 of FIG.
A downlink frequency converter 231 in FIG. 11A includes a local oscillator 2311, a frequency mixer 2312, and an output filter 2313. The pass band of the output filter 2313 is set so that the first frequencies F1A and F1B of the downlink signals of the communication operators A and B pass. In the local oscillator 2311, the local oscillation frequency is switched in a time-division manner by the control unit 24 based on the relay switching instruction information or the relay switching schedule information of the communication operators A and B according to the time when the communication operator communicates. Specifically, the local oscillation frequency is set to F1A-F2 when relaying the communication operator A's wireless communication, and the local oscillation frequency is set to F1B-F2 when relaying the communication operator B's wireless communication. Be controlled. The local oscillation frequency signal and the downlink signal (F2) whose settings are switched in this way are mixed by the frequency mixer 2312 and output from the output filter 2313. The frequency of the signal output from the output filter 2313 is switched to F1A or F1B according to the communication time of the communication operators A and B.

  Further, the uplink frequency converter 232 in FIG. 11B includes a local oscillator 2321, a frequency mixer 2322, and an output filter 2323. The pass band of the output filter 2323 is set so that the common second frequency (intermediate frequency) F2 'passes. In the local oscillator 2321, the local oscillation frequency is switched in a time-sharing manner according to the time when the communication operator communicates based on the relay switching instruction information or relay switching schedule information of the communication operators A and B by the control unit 24. Specifically, when relaying communication operator A's wireless communication, the local oscillation frequency is set to F2'-F1A ', and when relaying communication operator B's wireless communication, the local oscillation frequency is set to F2'-F1B'. The switching is controlled so that The signal of the local oscillation frequency and the uplink signal (F1A ′ or F1B ′) whose settings are switched in this way are mixed by the frequency mixer 1322 and output from the output filter 1323. The frequency of the signal output from the output filter 1323 becomes the common second frequency (intermediate frequency) F2 'regardless of which of the uplink signals of the communication operators A and B is input.

  FIG. 12 is a block diagram illustrating another configuration example of the first radio relay station (master unit) 10 that supports downlink and uplink bidirectional radio relay of the radio relay system according to the embodiment. This configuration example is an example in which a plurality of directional antennas 101A and 101B are used as the first antenna on the fixed base station side, similarly to the configuration example of FIG. In this configuration example, individual frequency converters 131A, 131B and 132A, 132B each having a conversion frequency fixed in advance for each communication operator A, B are provided for each of the downlink and uplink. In FIG. 12, the same parts as those in FIG. 5 described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 12, the downlink radio relay switching unit 118D of the first radio communication unit 11 does not include the communication operator switching unit 115, and the radio relay frequencies F1A and F1B output from the amplifiers 111A and 111B of the respective communication operators A and B. Are respectively input to corresponding frequency converters 131A and 131B. The transmission signal of the common second frequency F2 output from each of the frequency converters 131A and 131B is input to the shared band filter 126 via the communication operator switching unit 125.

  The communication operator switching unit 125 is configured by a switch that can be switched by a control signal from the control unit 14, and converts the frequency of the downlink signal path based on the relay switching instruction information or relay switching schedule information of the communication operators A and B. Control is performed so as to switch to a path that passes through the device 131A or a path that passes through the frequency converter 131B. The communication operator switching unit 125 and the control unit 14 perform switching control for controlling to relay the wireless communication of the plurality of communication operators A and B in a time division manner with the second wireless relay station (slave unit) 20. Configure the means.

The uplink reception signal of the second frequency F2 ′ common to the respective communication operators A and B output from the amplifier 121 of the second wireless communication unit 12 is distributed by the reception signal distribution unit 212 and frequency converters 132A and 132B. Is input. Uplink received signals S _{R1A ′} and S _{R1B ′} frequency-converted to the first frequencies F1A ′ and F1B ′ by the frequency converters 132A and 132B are respectively supplied to the ON / OFF switching units 113A and 113B of the uplink signal processing path. To the amplifiers 117A and 117B. Uplink transmission signals S _{T1A ′} and S _{T1B ′} of frequencies F1A ′ and F1B ′ amplified to a predetermined power by the amplifiers 117A and 117B are transmitted to the mobile base station 30A via the DUPs 110A and 110B and the first antennas 101A and 101B. , 30B.

  The ON / OFF switching units 113A and 113B of the uplink signal processing path are configured by switches or attenuators (ATT) that can be switched by a control signal from the control unit 14, for example. The ON / OFF switching units 113A and 113B and the control unit 14 block the signal output circuit of the uplink signal for the fixed base station of the communication operator that is not wirelessly relayed in synchronization with the relay switching of the communication operators A and B. Functions as a means.

The ON / OFF switching units 113A and 113B complement the uplink transmission signal paths via the amplifiers 117A and 117B of the respective communication operators A and B based on the relay switching instruction information or the relay switching schedule information of the communication operators A and B. It is controlled so as to be turned ON / OFF. For example, when relaying the wireless communication of the communication operator A, and transmits a 'transmission signal _{S T1A uplink'} frequency F1A to the ON / OFF switching section 113A to ON in the mobile base station 30A, ON / OFF and a switching section 113B in OFF 'transmission signal _{S T1B uplink'} frequency F1B from being transmitted. On the other hand, when the relays wireless communication of a communication operator B sends towards a 'transmission signal _{S T1B uplink'} frequency F1B ON the ON / OFF switching section 113B to the mobile base station 30B, ON / OFF and a switch unit 113A to OFF 'transmission signal _{S T1A uplink'} frequency F1A from being transmitted. By not transmitting uplink transmission signals that are not subject to wireless relay in this way, it is possible to suppress noise and interference in the mobile base stations 30A, 30B, etc. of the respective communication operators A, B. Note that the ON / OFF switching units 113A and 113B may be omitted when noise and interference are at an acceptable level.

  Further, the ON / OFF switching units 113A and 113B and the control unit 14 synchronize with the relay switching of the communication operators A and B so that unnecessary power is not used, and the first wireless relay of the communication operator that is not wirelessly relaying. It may function as means for turning off all the power of the circuit of the uplink signal related to the wireless communication of the station (master unit).

  FIGS. 13 (a) and 13 (b) respectively show configuration examples of downlink and uplink frequency converters 131A and 132A corresponding to the communication operator A in the first radio relay station (master unit) of FIG. FIG. 14A and 14B are configurations of frequency converters 131B and 132B for the downlink and the uplink corresponding to the communication operator B in the first radio relay station (master unit) in FIG. 12, respectively. It is a block diagram which shows an example. In FIGS. 13 and 14, the same parts as those in FIG.

  In the configuration example of the first radio relay station (master unit) 10 in FIGS. 12 to 13, frequency converters 131 </ b> A, B and 132 </ b> A, B corresponding to the downlink and the uplink are provided for each communication operator A, B. ing. The local oscillation frequencies of the local oscillators 1311A and 1321A of the frequency converters 131A and 132A of FIG. 13 can be set in advance to frequencies fixed for the communication operator A (F2-F1A, F1A′-F2 ′). . Further, the local oscillation frequencies of the local oscillators 1311B and 1321B of the frequency converters 131B and 132B in FIG. 14 are set in advance to frequencies fixed for the communication operator B (F2-F1B, F1B′-F2 ′). Can do. Therefore, frequency conversion is facilitated, and control for switching the local oscillation frequency in a time-sharing manner according to the communication time of each communication operator becomes unnecessary.

  FIG. 15 is a block diagram illustrating another configuration example of the second radio relay station (slave unit) 20 corresponding to the downlink and uplink bidirectional radio relays of the radio relay system according to the embodiment. This configuration example is a configuration example used in combination with the first radio relay station (master unit) 10 of FIG. In FIG. 15, the same components as those in FIGS. 5, 9, and 12 are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 15, the downlink received signal processing unit on the base side of the first wireless communication unit 21 does not include a communication operator switching unit, and is provided for each of the received signal distribution unit 212 and the communication operators A and B. Amplifiers 211A and 211B with automatic gain control (AGC) function and band-pass filters 214A and 214B.

  The uplink transmission signal processing unit on the base unit side includes a common amplifier (for example, a linear amplifier) 217 for the second frequency F2 'and an uplink radio relay switching unit 218U.

  The uplink radio relay switching unit 218U includes a band filter 216A for the communication operator A, a band filter 216B for the communication operator B, and a communication operator switching unit 215. Band-pass filters (BPF) 216A and 216B selectively pass the frequency F2 'of the uplink signal common to the communication operators A and B, respectively. Band filters (BPF) 216A and 216B may be provided as a common band filter before or after the amplifier 217.

  The communication operator switching unit 215 is configured by a switch that can be switched by a control signal from the control unit 24, for example, and based on the relay switching instruction information or relay switching schedule information of the communication operators A and B, Control is performed so as to switch to a path that passes through the converter 232A and the band-pass filter 216A, or a path that passes through the frequency converter 232B and the band-pass filter 216B.

  The amplifier 217 amplifies the transmission signal of the radio relay frequency F2 'common to the communication operators A and B that have passed through the band-pass filter (BPF) 216A or 216B to a predetermined power (signal level).

  The downlink reception signal of the common second frequency F2 received from the base unit 10 is distributed by the reception signal distribution unit 212, and is supplied to the communication operators A and B via the amplifiers 211A and 211B and the bandpass filters 214A and 214B. The corresponding frequency converters 231A and 231B are input. The signals of the first frequencies F1A and F1B of the communication operators A and B output from the frequency converters 231A and 231B are input to the downlink radio relay switching unit 228D, respectively.

  The uplink reception signals of the first frequencies F1A and F1B output from the common amplifier 221 of the uplink reception signal processing unit on the mobile station side of the second wireless communication unit 22 are distributed by the reception signal distribution unit 222, and the communication operator The signals are input to frequency converters 231A and 231B provided for A and B, respectively.

  In the second radio relay station (slave unit) 20 in FIG. 15, the communication operator switching units 215 and 225 and the control unit 24 are connected to the first radio relay station (master unit) 10 by a plurality of communication operators A, A switching control unit is configured to perform control so that the wireless communication of B is switched and relayed in a time division manner.

  FIGS. 16A and 16B are configuration examples of frequency converters 231A and 232A for the downlink and uplink, respectively, corresponding to the communication operator A in the second radio relay station (slave unit) 20 of FIG. FIG. 17 (a) and 17 (b) respectively show downlink and uplink frequency converters 231B and 232B corresponding to the communication operator B in the second radio relay station (slave unit) 20 in FIG. It is a block diagram which shows the example of a structure. In FIGS. 16 and 17, the same parts as those in FIG.

  In the configuration example of the second radio relay station (slave unit) 20 in FIGS. 15 to 17, frequency converters 231 </ b> A and B and 232 </ b> A and B corresponding to the downlink and the uplink are provided for each of the communication operators A and B. ing. The local oscillation frequencies of the local oscillators 2311A and 2321A of the frequency converters 231A and 232A of FIG. 16 can be set in advance to frequencies fixed for the communication operator A (F1-F2, F2′-F1A ′). . Also, the local oscillation frequencies of the local oscillators 2311B and 2321B of the frequency converters 231B and 232B of FIG. 17 are set in advance to frequencies fixed for the communication operator B (F1B-F2, F2′-F1B ′). Can do. Therefore, frequency conversion is facilitated, and control for switching the local oscillation frequency in a time-sharing manner according to the communication time of each communication operator becomes unnecessary.

  In the wireless relay system of each of the embodiments described above, the plurality of communication operators A and B to be wirelessly relayed may be switched alternately at predetermined intervals set in advance, may be switched in real time at any timing, You may switch based on the set switching schedule.

  FIG. 18 is a time chart illustrating an example of switching control of communication operators to be wirelessly relayed in the wireless relay system according to the embodiment. In FIG. 18, the control unit 14 of the base unit 10 is instructed to switch 1 for switching the relay target from the communication operator A to the communication operator B by the manual operation of the operator who operates the base unit 10. 1 relay switching instruction information is transmitted to the slave unit 20 via the control communication device 15. Further, the control unit 14 of the base unit 10 switches the relay target operator of the wireless communication with the handset 20 from the communication operator A to the communication operator B based on the relay switching instruction information of the switching 1 so as to relay. Control. The control unit 24 of the child device 20 determines the operator to be relayed for wireless communication with the parent device 10 based on the relay switching instruction information of switching 1 received from the parent device 10 via the control communication device 25 as a communication operator. Control to switch from A to communication operator B and relay. Similarly, when there is an instruction for switching 2 (communication operator B to communication operator A) and switching 3 (switching from communication operator A to communication operator B), control of the control unit 14 of the master unit 10 and control of the slave unit 20 The unit 24 performs control so that the communication operators are simultaneously switched and relayed based on the relay switching instruction information of the switchings 2 and 3. As described above, according to the control example of this example, when there is a switching instruction for a communication operator to be relayed by manual operation or the like at an arbitrary timing, the master unit 10 and the slave unit 20 are in accordance with the switching instruction. The communication operator to be relayed by wireless communication can be switched in real time.

FIG. 19 is a time chart illustrating another example of switching control of a communication operator to be wirelessly relayed in the wireless relay system according to the embodiment. In FIG. 19, the control unit 14 of the base unit 10 creates the relay switching schedule information of the communication operators A and B as shown in Table 1 by the manual operation of the operator who operates the base unit 10. The schedule information is transmitted to the slave unit 20 via the control communication device 15.

  Based on the relay switching schedule information, the control unit 14 of the parent device 10 changes the communication target operator from the communication operator A to the communication operator B at the timing when the time t1 of the switching 1 is reached. Control to switch to and relay. Further, the control unit (slave) 24 of the slave unit 20 relays wireless communication with the master unit 10 at the timing when the time t1 of the switch 1 is reached based on the relay switching schedule information received from the master unit 10. Control is performed so that the target operator is switched from the communication operator A to the communication operator B and relayed. Similarly, at the timing when switching 2 (communication operator B to communication operator A) reaches time t2 and switching 3 (switching from communication operator A to communication operator B) at time t3, the master unit 10 The control unit 14 and the control unit 24 of the slave unit 20 perform control so that communication operators are simultaneously switched and relayed. As described above, according to the control example of this example, the communication operator to be relayed for wireless communication by the parent device 10 and the child device 20 can be switched according to the relay switching schedule information created in advance by the parent device 10. it can.

  In the wireless relay system of each of the above embodiments, a plurality of communication operators A and B that are wireless relay targets may be remotely controlled based on control information from a remote control device.

FIG. 20A and FIG. 20B are explanatory diagrams illustrating an example of remote switching control of a communication operator to be wirelessly relayed in the wireless relay system according to the embodiment.
In FIG. 20A, a remote control device 81 (remote control device 81A, 81B or other common remote control device) is a communication operator to be relayed by a manual operation of an operator who operates the remote control device 81. When switching is instructed, the relay switching instruction information is transmitted to the control unit 14 of the base unit 10 via the mobile communication network. When receiving the relay switching instruction information from the remote control device 81, the control unit 14 of the base unit 10 transmits (transfers) the relay switching instruction information to the control unit 24 of the slave unit 20 via wireless communication such as WiFi or a mobile communication network. ) Based on the relay switching instruction information set by the remote control device 81, the control unit 14 of the parent device 10 and the control unit 24 of the child device 20 perform control so that the communication operator to be relayed for wireless communication is switched in real time.

  In FIG. 20B, the remote control device 81 (remote control device 81A, 81B or other common remote control device) is connected to the communication operators A, B by the manual operation of the operator who operates the remote control device 81. Is created, the relay switching schedule information is transmitted to the control unit 14 of the parent device 10 via the mobile communication network. When receiving the relay switching schedule information from the remote control device 81, the control unit 14 of the base unit 10 transmits (transfers) the relay switching schedule information to the control unit 24 of the slave unit 20 via wireless communication such as WiFi or a mobile communication network. ) The control unit 14 of the parent device 10 and the control unit 24 of the child device 20 perform control so as to switch the communication operator to be relayed for wireless communication based on the relay switching schedule information created by the remote control device 81.

  As described above, according to the present embodiment, after the first wireless relay station 10 is mounted on the automobile and moved to the target position, the connection work to the core network and the setup work of the base station as in the case of mounting the base station are performed. Since it is not necessary to perform this, relay of wireless communication between the fixed base stations 30A and 30B of the plurality of communication operators A and B and the mobile stations (user devices) 40A and 40B can be started promptly.

  Further, according to the present embodiment, the base station device (eNodeB) is not required for the base unit 10 and the configuration is simple.

  In general, in order to relay the service links of a plurality of communication operators A and B, a radio relay frequency that is the sum (sum) of the frequency bandwidths of the communication operators A and B is necessary. Accordingly, since the common intermediate frequency F2 / F2 ′ can be used for the wireless relay of the plurality of communication operators A and B, the bandwidth of the intermediate frequency used for the wireless relay can be suppressed. For example, when the number of communication operators to be relayed is N, the bandwidth of the intermediate frequency common to the wireless relay can be reduced to 1 / N compared to the case where different intermediate frequencies are used for each communication operator.

  Further, according to the present embodiment, when the number of communication operators to be relayed is N, the total transmission power between the parent device and the child device (uplink / downlink) and between the child device and the mobile station (downlink) When the total transmission power is constant, the transmission power between the master unit and the slave unit (uplink / downlink) and between the slave unit and the mobile station (downlink) are compared to the case where different intermediate frequencies are used for each communication operator. ) Can be increased N times.

  For example, as in the comparative example of FIG. 21 (a), a plurality of intermediate frequencies (F2A / F2A ′, F2A / F2A ′, When F2B / F2B ′) is used, assuming that the total transmission power between the master unit and the slave unit (uplink / downlink) is PM, between the master unit and the slave unit (uplink / downlink) of each of the communication operators A and B ) Is PM / 2. On the other hand, when the common intermediate frequency F2 / F2 ′ is used for wireless relay of a plurality of communication operators A and B as in the present embodiment shown in FIG. The transmission power Pm between the machine and the slave (uplink / downlink) is twice as much as that of the comparative example.

  Further, when wireless communication of communication operators A and B is simultaneously performed on the service link between the slave unit and the mobile station (downlink) as in the comparative example of FIG. 22A, between the slave unit and the mobile station (downlink). Is PS / 2, the transmission power Ps between the slave unit and the mobile station (downlink) of each of the communication operators A and B is PS / 2. On the other hand, when the wireless communication of the communication operators A and B is switched by the service link between the slave unit and the mobile station (downlink) as in the present embodiment of FIG. 22B, the communication operators A and B The transmission power Ps between each slave unit and the mobile station (downlink) is PS twice that of the comparative example.

  Since the transmission power between the parent device and the child device (up and down line) and the transmission power between the child device and the mobile station (downlink) can be increased in this way, the relay distance between the parent device and the child device and the child device and the mobile station are increased. The service area in between can be enlarged.

  According to the configuration example of FIG. 5 and FIG. 12, a plurality of directional antennas 101A and 101B are used as the first antenna for the mobile radio base station (fixed base stations 30A and 30B) of the first radio relay station (master unit) 10. The communication operators A and B can improve the communication quality by transmitting and receiving to and from the mobile base stations (fixed base stations 30A and 30B) for each of the communication operators A and B.

  Further, in particular, according to the configuration examples of FIGS. 5 to 17, an AGC (Auto Gain Control) is provided for each of the downlink radio relay frequencies (first frequencies) F1A and F1B received by the first radio relay station (master unit) 10. ) Is applied so that the output of the radio signal for the slave unit having the intermediate frequency (second frequency) F2 corresponding to each of the communication operators A and B becomes the same power. Further, the AGC is applied to the signal of the intermediate frequency (second frequency) F2 received by the second radio relay station (slave unit) 20, and the radio relay frequency (first frequency) F1A of each communication operator A, B is applied. Control is performed so that the output of F1B for the mobile station has the same power. By controlling the power adjustment of the first radio relay station (master unit) 10 and the second radio relay station (slave unit) 20, radio relay for the mobile station of the second radio relay station (slave unit) 20 in the downlink is performed. Since the transmission powers of the frequencies (first frequency) F1A and F1B are the same, the radio relay area (cell 200 of the slave unit 20) is set between the radio relay frequencies (first frequency) F1A and F1B corresponding to the respective communication operators A and B. ) Will be the same.

  Further, according to the present embodiment, there is a difference between the mobile base station areas (cells 300A and 300B of the fixed base stations 30A and 30B) and the wireless relay areas (cell 200 of the slave unit 20) of the communication operators A and B. Even if there is a partial overlap, since the mobile base station (fixed base stations 30A and 30B) and the wireless relay system transmit the same signal, it interferes with the mobile stations (user terminals) 40A and 40B located in the overlapping area. It will not be. Rather, since the radio signals transmitted from both the mobile base stations (fixed base stations 30A and 30B) and the radio relay system are added and received, the communication quality is improved (see FIG. 23).

  Further, according to the present embodiment, the base unit 10 mounted on the automobile 50 or the like extends to the end of the service area (cells 300A and 300B) of the mobile base stations (fixed base stations 30A and 30B) of the communication operators A and B. Can move. For example, if the base unit 10 is moved to the end of the mobile base station area (the cell end of the fixed base stations 30A and 30B), it can be relayed from there to the sub unit 20, so the service area of the wireless relay system is extended further. (See FIG. 24 (a) and FIG. 24 (b)).

  Further, according to the present embodiment, the service area of the wireless relay system can be continuously expanded if the base unit 10 is mounted on the automobile 50 and travels. For example, when searching for the victims outside the service area (cells 300A, 300B) of the mobile base stations (fixed base stations 30A, 30B) of the respective communication operators A, B, the area can be expanded continuously, so the search The range can be easily expanded in a short time. In particular, the faster the traveling speed of the automobile 50 or the like, the longer the area can be expanded (see FIG. 25).

  In addition, according to the present embodiment, the base unit 10 controls the remote control communication ON / OFF or the power ON / OFF and the device monitoring by the control communication device 15 (15A, 15B). Communication can be performed between the unit 14 and at least one of the remote control devices 81A and 81B (control sources) provided in the communication operators A and B of the mobile communication networks 80A and 80B. In addition, the handset 20 is controlled by the control communication device 25 (25A, 25B) such as the above-described user terminal (mobile station), and the remote control communication ON / OFF, the power ON / OFF control, and the wireless communication unit amplifier ( AMP) gain control (maximum transmission power control) and communication between at least one of the remote control devices 81A and 81B (control sources) of the communication operators A and B of the mobile communication networks 80A and 80B. It can be carried out.

  The communication operators A and B can independently remotely control the start and end of the communication of the wireless relay system by remotely performing the ON / OFF of the communication of the base unit 10 or the ON / OFF control of the power supply. For example, when the master unit 10 and the slave unit 20 are installed at predetermined places, the communication of the master unit 10 is remotely turned on / off or powered from the remote control devices 81A and 81B (control sources) provided in the communication operators A and B. ON / OFF control is performed. Thereby, the start and stop of communication of the wireless relay system can be remotely controlled for each of the communication operators A and B.

  Similarly, the start and stop of communication of the wireless relay system can be controlled by the slave unit 20 by remotely controlling the power on / off of the slave unit 20 after the communication of the master unit 10 is turned on. Further, gain control (maximum transmission power control) of the amplifier (AMP) of the slave unit 20 can be performed remotely.

  Further, according to the present embodiment, when the wireless relay system interferes with the service area (cell 300C) of another mobile base station (fixed base station 30C), the gain (AMP) of the handset 20 (AMP) By performing reduction control on the maximum transmission power), it is possible to suppress pre-interference with the service area (cell 300C) of another mobile base station (fixed base station 30C) (see FIG. 27).

  Note that the processing steps described in this specification and the components of the base station apparatus in the radio relay station, the remote control apparatus, and the base station can be implemented by various means. For example, these steps and components may be implemented in hardware, firmware, software, or a combination thereof.

  As for hardware implementation, the above-described steps are performed in an entity (eg, wireless relay station, base station device, wireless relay device, user device (mobile station, communication terminal), remote control device, hard disk drive device, or optical disk drive device). Means such as processing units used to implement the components include one or more application specific ICs (ASICs), digital signal processors (DSPs), digital signal processors (DSPDs), programmable logic devices (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, electronic device, other electronic unit, computer designed to perform the functions described herein Or a set of them It may be implemented in the suit.

  Also, for firmware and / or software implementation, means such as processing units used to implement the above components may be programs (eg, procedures, functions, modules, instructions) that perform the functions described herein. , Etc.). In general, any computer / processor readable medium that specifically embodies firmware and / or software code is means such as a processing unit used to implement the steps and components described herein. May be used to implement For example, the firmware and / or software code may be stored in a memory, for example, in a control device, and executed by a computer or processor. The memory may be implemented inside the computer or processor, or may be implemented outside the processor. The firmware and / or software code may be, for example, random access memory (RAM), read only memory (ROM), nonvolatile random access memory (NVRAM), programmable read only memory (PROM), electrically erasable PROM (EEPROM) ), FLASH memory, floppy disk, compact disk (CD), digital versatile disk (DVD), magnetic or optical data storage, etc. Good. The code may be executed by one or more computers or processors, and may cause the computers or processors to execute the functional aspects described herein.

  Also, descriptions of embodiments disclosed herein are provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. The present disclosure is therefore not limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

10: First radio relay station (master unit)
11: 1st wireless communication part 12: 2nd wireless communication part 13: Frequency conversion part 14: Control part 15: Communication apparatus for control 20: 2nd wireless relay station (slave unit)
21: First wireless communication unit 22: Second wireless communication unit 23: Frequency conversion unit 24: Control unit 25: Control communication device 30A, 30B: Fixed base station (mobile base station)
30C: Fixed base station 31A, 31B: Antenna 40A, 40B: Mobile station 50: Automobile 60: Balloon 70: Aircraft 80A, 80B: Mobile communication network 81 (81A, 81B, 81C): Remote control device 101 (101A, 101B) ): First antenna 102: second antenna 111 (111A, 111B): amplifier 112: received signal distribution unit 113A, 113B: ON / OFF switching unit 114A, 114B: band filter 115: communication operator switching unit 116 (116A, 116B) ): Band filter 117 (117A, 117B): amplifier 118D: downlink radio relay switching unit 118U: uplink radio relay switching unit 119: communication operator switching unit 121: amplifier 124: band filter 125: communication operator switching unit 126: band Filter 12 : Amplifier 131 (131A, 131B): frequency converter 132 (132A, 132B): frequency converter 200: cell 201: first antenna 202: second antenna 211 (211A, 211B): amplifier 212: received signal distributor 214 (214A, 214B): band filter 215: communication operator switching unit 216 (216A, 216B): band filter 217: amplifier 218U: uplink radio relay switching unit 221: amplifier 222: received signal distribution unit 224: band filter 225: communication Operator switching unit 226A, 226B: band filter 227: amplifier 228D: downlink radio relay switching unit 231 (231A, 231B): frequency converter 232 (232A, 232B): frequency converter 255: communication operator switching unit 300A : Cell 300B: Cell 300C: Cell 1311 (1311A, 1311B): Local oscillator 1312: Frequency mixer 1321 (1321A, 1321B): Local oscillator 1322: Frequency mixer 2311 (2311A, 2311B): Local oscillator 2312: Frequency mixer 2321 (2321A, 2321B): Local oscillator 2322: Frequency mixer

Claims (5)

A radio relay system that relays radio communication between a fixed base station and user equipment of a plurality of communication operators having different radio signal frequencies,
A movable first radio relay station, and a second radio relay station positioned higher than the first radio relay station,
The first radio relay station includes a first radio communication unit that transmits and receives radio signals of a plurality of first frequencies different from each other corresponding to the plurality of fixed base stations with the fixed base stations of the plurality of communication operators. A second radio communication unit that transmits and receives a radio signal having a second frequency common to the plurality of communication operators to and from the second radio relay station, and performs frequency conversion between the first frequency and the second frequency. Switching control means for controlling to switch and relay the wireless communication of the plurality of communication operators in a time-sharing manner between the frequency conversion unit and the second wireless relay station,
The second radio relay station includes a plurality of first frequency radio signals between a first radio communication unit that transmits and receives the radio signal of the second frequency to and from the first radio relay station, and a user apparatus. In synchronization with the relay switching by the switching control means of the first radio relay station, a second radio communication unit for transmitting and receiving, a frequency converter for performing frequency conversion between the first frequency and the second frequency, Switching control means for controlling to switch and relay the wireless communication of the plurality of communication operators in a time-sharing manner with the first wireless relay station,
The wireless relay system according to claim 1, wherein the bandwidth of the second frequency is set to a maximum bandwidth among a plurality of communication bands required for wireless communication of each of the plurality of communication operators. The wireless relay system according to claim 1,
The switching control means of the first radio relay station is
A switching unit that switches relay signal paths of the plurality of communication operators in the first wireless relay station;
When switching of a communication operator to be relayed is instructed, a control unit that controls the switching unit based on the relay switching instruction information;
A transmission unit for transmitting the relay switching instruction information to the second radio relay station,
The switching control means of the second radio relay station is
A switching unit that switches relay signal paths of the plurality of communication operators in the second radio relay station;
A receiving unit that receives the relay switching instruction information from the first wireless relay station;
And a control unit that controls the switching unit based on the relay switching instruction information received from the first wireless relay station. The wireless relay system according to claim 1,
The switching control means of the first radio relay station is
A switching unit that switches relay signal paths of the plurality of communication operators in the first wireless relay station;
A controller configured to preset relay switching schedule information of the communication operator and control the switching unit based on the relay switching schedule information;
A transmission unit for transmitting the relay switching schedule information to the second wireless relay station,
The switching control means of the second radio relay station is
A switching unit that switches relay signal paths of the plurality of communication operators in the second radio relay station;
A receiving unit for receiving the relay switching schedule information from the first wireless relay station;
And a control unit that controls the switching unit based on the relay switching schedule information received from the first wireless relay station. The wireless relay system according to claim 1,
The switching control means of the first radio relay station is
A switching unit that switches relay signal paths of the plurality of communication operators in the first wireless relay station;
A receiving unit for receiving, from a remote control device, relay switching instruction information for instructing switching of a communication operator to be relayed or relay switching schedule information of the communication operator;
A control unit that controls the switching unit based on the relay switching instruction information or the relay switching schedule information received from the remote control device;
A transmission unit for transmitting the relay switching instruction information or the relay switching schedule information to the second wireless relay station,
The switching control means of the second radio relay station is
A switching unit that switches relay signal paths of the plurality of communication operators in the second radio relay station;
A receiving unit that receives the relay switching instruction information or the relay switching schedule information from the first radio relay station;
And a control unit that controls the switching unit based on the relay switching instruction information or the relay switching schedule information received from the first wireless relay station. In the radio relay system according to any one of claims 1 to 4,
The first radio relay station turns off all the circuits related to radio communication of the first radio relay station and the second radio relay station of a communication operator that does not perform radio relay among the plurality of communication operators. Relay system.

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