JP7526456B2 - Communications system - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act Proceedings of the 2019 IEICE Society Conference, August 27, 2020 (Publication date) [Publications] 2019 IEICE Society Conference (meeting name), September 13, 2020 (date) [Publications] SmartCom 2019 (meeting name), November 4, 2020 (date)

The present invention relates to a communication technology, and more particularly to a communication system that controls the directivity of an antenna.

In order to provide high-quality wireless communication, the transmitting device selects at least one array antenna from multiple array antennas connected by cables, and transmits a signal from the selected at least one array antenna while performing beamforming (see, for example, Patent Document 1).

US Patent Application Publication No. 2016/0191124

To increase the communication capacity of wireless communication, MIMO (Multi-Input Multi-Output) transmission is implemented. However, the higher the carrier frequency used for wireless communication, the more dominant the influence of direct waves becomes, leading to higher spatial correlation and making it difficult to increase communication capacity even with MIMO transmission.

This disclosure has been made in light of these circumstances, and its purpose is to provide technology that increases communication capacity in situations where the effects of direct waves are dominant.

In order to solve the above problems, a communication system according to one aspect of the present invention includes a base station device, a plurality of analog repeater devices capable of communicating with the base station device, a terminal device that communicates with the base station device by relaying through at least two of the plurality of analog repeater devices, and a control device that selects two or more analog repeater devices to be used for relaying from among the plurality of analog repeater devices according to the location of the terminal device. The base station device controls directivity so as to be directed toward the two or more analog repeater devices selected by the control device, and the two or more analog repeater devices selected from the plurality of analog repeater devices control directivity so as to be directed toward the terminal device. Each of the multiple analog relay devices includes multiple base station side antennas, multiple base station side phase shifters connected to each of the multiple base station side antennas, a base station side processing unit that combines signals from the multiple base station side phase shifters, multiple terminal side antennas, multiple terminal side phase shifters connected to each of the multiple terminal side antennas, a terminal side processing unit that distributes signals to each of the multiple terminal side phase shifters, and an amplifier arranged between the base station side processing unit and the terminal side processing unit, and the multiple base station side antennas, the multiple base station side phase shifters, the base station side processing unit, the multiple terminal side antennas, the multiple terminal side phase shifters, the terminal side processing unit and the amplifier process analog signals .
Another aspect of the present invention is also a communication system. This communication system includes a base station device, a plurality of analog relay devices capable of communicating with the base station device, a terminal device that communicates with the base station device by relaying through at least two of the plurality of analog relay devices, and a control device that selects two or more analog relay devices to be used for relaying from the plurality of analog relay devices according to the location of the terminal device. The base station device controls directivity to the two or more analog relay devices selected by the control device, and the two or more selected analog relay devices among the plurality of analog relay devices control directivity to the terminal device, and the control device stores a table showing information on the two or more analog relay devices to be selected, information on directivity at the two or more analog relay devices, and information on directivity of the base station device to the two or more analog relay devices, so as to correspond to the location of the terminal device, and the control device selects information on the two or more analog relay devices to be selected, information on directivity at the two or more analog relay devices, and information on directivity of the base station device to the two or more analog relay devices from the table based on the location of the terminal device, and the control device outputs directivity information to each of the two or more selected analog relay devices and outputs directivity information to the base station device.
Yet another aspect of the present invention is also a communication system. The communication system includes a base station device, a plurality of analog relay devices capable of communicating with the base station device, a terminal device that communicates with the base station device by relaying through at least two of the plurality of analog relay devices, and a control device that selects two or more analog relay devices to be used for relaying from among the plurality of analog relay devices according to the location of the terminal device. The base station device controls directivity so as to be directed toward the two or more analog relay devices selected by the control device, and the two or more analog relay devices selected from among the plurality of analog relay devices control directivity so as to be directed toward the terminal device, the terminal device including a first terminal device and a second terminal device, and the control device selects, according to the location of the first terminal device, the two or more analog relay devices to be used for relaying the first terminal device as a first group of analog relay devices, and, according to the location of the second terminal device, selects, among the plurality of analog relay devices, the two or more analog relay devices to be used for relaying the second terminal device as a second group of analog relay devices. The base station device controls directivity so as to be directed toward two or more analog repeating devices of a first group and also controls directivity so as to be directed toward two or more analog repeating devices of a second group, and among the plurality of analog repeating devices, the two or more analog repeating devices of the first group control directivity so as to be directed toward a first terminal device, and among the plurality of analog repeating devices, the two or more analog repeating devices of the second group control directivity so as to be directed toward a second terminal device, and the control device receives information on the two or more analog repeating devices to be selected as the first group, the two or more analog repeating devices of the first group, and the two or more analog repeating devices of the first group, corresponding to a combination of the location of the first terminal device and the location of the second terminal device. The control device stores a table showing information on directivity at the relay device, information on directivity of the base station device to two or more analog relay devices of the first group, information on two or more analog relay devices to be selected as a second group, information on directivity at two or more analog relay devices of the second group, and information on directivity of the base station device to two or more analog relay devices of the second group, and the control device selects information on two or more analog relay devices to be selected as a first group, information on directivity at two or more analog relay devices of the first group, and information on directivity of the base station device to two or more analog relay devices of the first group from the table based on a combination of the position of the first terminal device and the position of the second terminal device. The control device selects directivity information, information on two or more analog repeater devices to be selected as the second group, directivity information at the two or more analog repeater devices of the second group, and directivity information of the base station device toward the two or more analog repeater devices of the second group, and outputs the directivity information to each of the selected two or more analog repeater devices of the first group and outputs the directivity information to the two or more analog repeater devices of the first group to the base station device, and the control device outputs the directivity information to each of the selected two or more analog repeater devices of the second group and outputs the directivity information to the two or more analog repeater devices of the second group to the base station device.
Yet another aspect of the present invention is also a communication system. The communication system includes a base station device, a plurality of analog relay devices capable of communicating with the base station device, a terminal device that communicates with the base station device by relaying through at least two of the plurality of analog relay devices, and a control device that selects two or more analog relay devices to be used for relaying from among the plurality of analog relay devices according to the location of the terminal device. The base station device controls directivity so as to be directed toward the two or more analog relay devices selected by the control device, and the two or more analog relay devices selected from among the plurality of analog relay devices control directivity so as to be directed toward the terminal device, the base station device includes a first base station device and a second base station device, the terminal device includes a first terminal device that communicates with the first base station device and a second terminal device that communicates with the second base station device, and the control device selects two or more analog relay devices to be used for relaying the first terminal device from among the plurality of analog relay devices as analog relay devices of a first group according to the location of the first terminal device, and selects two or more analog relay devices to be used for relaying the second terminal device from among the plurality of analog relay devices as analog relay devices of a second group according to the location of the second terminal device. a first base station device controls directivity so as to be directed toward two or more analog repeater devices of a first group, and a second base station device controls directivity so as to be directed toward two or more analog repeater devices of a second group, and among the plurality of analog repeater devices, the two or more analog repeater devices of the first group control directivity so as to be directed toward the first base station device and also control directivity so as to be directed toward the first terminal device, and among the plurality of analog repeater devices, the two or more analog repeater devices of the second group control directivity so as to be directed toward the second base station device and also control directivity so as to be directed toward the second terminal device, and the control device selects information of the first base station device, the first group, and the second group so as to correspond to a combination of the position of the first terminal device and the position of the second terminal device. The control device stores a table showing information on two or more analog relay devices to be selected as the first group, information on directivity at two or more analog relay devices in the first group, information on directivity of a first base station device to two or more analog relay devices in the first group, information on a second base station device, information on two or more analog relay devices to be selected as the second group, information on directivity at two or more analog relay devices in the second group, and information on directivity of a second base station device to two or more analog relay devices in the second group, and the control device selects information on the first base station device, information on the two or more analog relay devices to be selected as the first group, information on directivity at two or more analog relay devices in the first group, and information on directivity of a second base station device to two or more analog relay devices in the second group from the table based on a combination of the position of the first terminal device and the position of the second terminal device. The control device selects information on directivity of the first base station device to two or more analog relay devices in the second group, information on the second base station device, information on two or more analog relay devices to be selected as the second group, information on directivity at two or more analog relay devices in the second group, and information on directivity of the second base station device to two or more analog relay devices in the second group, and outputs the directivity information to each of the selected two or more analog relay devices in the first group to the first base station device, and the control device outputs the directivity information to each of the selected two or more analog relay devices in the second group and outputs the directivity information to the two or more analog relay devices in the second group to the second base station device.

In addition, any combination of the above components, or conversion between expressions of this disclosure as methods, devices, systems, computer programs, or recording media on which computer programs are recorded, are also valid aspects of this disclosure.

According to one aspect of the present invention, communication capacity can be increased in situations where the influence of direct waves is dominant.

FIG. 1 is a diagram illustrating a configuration of a communication system according to an embodiment of the present invention. FIG. 2 is a diagram showing a detailed configuration of the communication system shown in FIG. 1. 3 is a diagram showing a data structure of a table stored in a storage unit in FIG. 2 . FIG. 2 is a diagram showing areas defined in the communication system of FIG. 1; 3 is a flowchart showing a processing procedure performed by the control device of FIG. 2 . FIG. 13 is a diagram showing a configuration of a communication system according to a first modified example. FIG. 11 is a diagram showing a configuration of a communication system according to a second modified example. FIG. 11 is a diagram showing a configuration of a communication system according to a third modified example.

Before describing the specific embodiments of the present invention, an overview of the present embodiment will be described. Due to the recent rapid increase in mobile traffic, there is a demand for a further increase in communication capacity. Examples include the distribution of ultra-high definition image content such as 4K, 8K, or AR/VR, and satellite offices that can be realized on moving vehicles. In order to achieve high-speed, large-capacity communication, 5G will introduce the millimeter wave band (e.g., 28 GHz band) which can secure a wide frequency band. However, the millimeter wave band has the disadvantages of being unable to secure coverage due to large distance attenuation, and being dominated by the influence of direct waves due to large diffraction loss, resulting in high spatial correlation.

In the fifth generation mobile communication system (5G) using the millimeter wave band, beamforming that controls the phase of a super-multiple element antenna is realized by massive MIMO transmission technology using a large-scale array antenna with tens or hundreds of elements. This allows high-gain beams to be formed, solving the problem of high millimeter wave loss. In addition, since multiple beams are formed, spatial multiplexing transmission to multiple users becomes possible. In multi-user massive MIMO, MIMO transmission is performed between multiple terminal devices and a base station device that are sufficiently separated in space, and the communication capacity of the entire system is increased in proportion to the number of antennas. On the other hand, in single-user massive MIMO, multiple beams are directed to one terminal device, so propagation path correlation is high, making it difficult to effectively utilize MIMO transmission.

The use of millimeter wave bands allows antennas to be miniaturized, making it possible to equip terminal devices with multi-element antennas. This means that mobile objects such as automobiles and buses carrying terminal devices can also be equipped with multi-element antennas. It is expected that the demand for high-capacity communication for mobile objects equipped with these multi-element antennas will increase in the future. Therefore, there is also a demand for realizing high-capacity, high-speed communication in single-user massive MIMO using millimeter wave bands. However, in single-user massive MIMO using the 28 GHz band, diffraction loss and distance loss become even larger, making it impossible to obtain multiple effective propagation paths. It has been reported that the penetration loss through buildings at 28 GHz in a real environment is 40 dB or more. At present, further increases in communication capacity cannot be expected by using millimeter wave and single-user massive MIMO in combination.

Previous research has addressed the reduction in coverage caused by obstruction in the millimeter wave band by using integrated access and backhaul (IAB) transmission or passive reflectors. It has been reported that these technologies can expand coverage and reduce spatial correlation. By applying IAB, it is possible to accommodate areas that would otherwise be out of coverage due to obstruction, and the coverage can be expanded. In passive reflectors, metamaterial reflectors in particular make it possible to arbitrarily design the propagation direction and beam width, making it possible to expand coverage. However, these technologies increase the cost of relay nodes. Furthermore, these technologies are merely a countermeasure against obstruction and cannot be expected to increase capacity.

To address this, this embodiment relates to a "millimeter wave massive relay MIMO system" that uses a large number of analog relay stations to intentionally generate a propagation path in millimeter wave massive MIMO transmission. In general, relay methods in multi-hop communication include AF (amplify-and-forward) type systems and DF (decode-and-forward) type systems. The AF type system amplifies the signal received from the starting node without demodulating or decoding it, and forwards it to the end node. The DF type system decodes the signal from the starting node, re-encodes it, and forwards it to the end node. Therefore, the AF type has the disadvantage of amplifying noise at the relay node and retransmitting it, but has the advantage of having smaller delays than the DF type because it does not demodulate or decode. One of the main purposes of 5G is to reduce the data transmission delays that exist in current wireless networks, so this embodiment adopts the AF type.

The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components, parts, and processes shown in each drawing will be given the same reference numerals, and duplicated descriptions will be omitted as appropriate. Furthermore, the embodiments do not limit the invention but are merely examples, and all of the features and combinations thereof described in the embodiments are not necessarily essential to the invention.

Figure 1 shows the configuration of a communication system 1000. The communication system 1000 includes a base station device 100, a first relay device 200a, ..., a ninth relay device 200i, collectively referred to as relay devices 200, a terminal device 400, an acquisition device 500, and a control device 600. The number of relay devices 200 included in the communication system 1000 is not limited to "9".

As a premise, in the communication system 1000, direct communication is performed between the base station device 100 and the terminal device 400 using millimeter waves. For example, direct communication is performed when there is line of sight between the base station device 100 and the terminal device 400. Under such circumstances, in order to improve the transmission characteristics in the communication system 1000, a relay device 200 is added as shown in FIG. 1. In this embodiment, the main focus will be on transmission on the downlink, which transmits a signal from the base station device 100 to the terminal device 400 via the relay device 200. The base station device 100 is a transmitting device that transmits a signal using millimeter waves. The antenna directivity of the base station device 100 is controllable.

The multiple relay devices 200 receive signals from the base station device 100, amplify the received signals, and then transmit them to the terminal device 400. Therefore, it can be said that the relay device 200 relays communication from the base station device 100 to the terminal device 400. In more detail, two or more relay devices 200 are grouped together as one group 300. For example, the first relay device 200a to the third relay device 200c are included in the first group 300a, the fourth relay device 200d to the sixth relay device 200f are included in the second group 300b, and the seventh relay device 200g to the ninth relay device 200i are included in the third group 300c. The number of groups 300 included in the communication system 1000 is not limited to "3", and the number of relay devices 200 included in one group 300 is not limited to "3". In this way, under a situation where multiple groups 300 are formed, three relay devices 200 included in one group 300 out of the multiple groups 300 perform relaying. The selection of the group 300 for which relay should be performed is made by the control device 600, which will be described later.

In the following, the side of the relay device 200 that receives a signal from the base station device 100 is referred to as the "base station side," while the side of the relay device 200 that transmits a signal to the terminal device 400 is referred to as the "terminal side." In the relay device 200, the antenna directivity on the base station side may be fixed or may be controllable. Also, in the relay device 200, the antenna directivity on the terminal side is controllable.

The terminal device 400 is mounted on a mobile object such as a car or a bus and can move. The terminal device 400 receives signals from three relay devices 200. That is, the terminal device 400 communicates with the base station device 100 by relaying signals from at least two of the multiple relay devices 200. The terminal device 400 has a positioning function using GNSS (Global Navigation Satellite System) and measures the current position of the terminal device 400. Positioning may be performed in the base station device 100. The terminal device 400 has a communication function such as a wireless communication system different from the wireless communication system from the base station device 100 to the terminal device 400, for example, 4G, and transmits information on the measured current position (hereinafter referred to as "position information") using the communication function such as 4G. Such positioning of the current position and transmission of the position information are performed periodically.

The acquisition device 500 acquires location information from the terminal device 400. The acquisition device 500 transmits the location information to the control device 600. Identification information for identifying the terminal device 400 is also added to the location information.

The control device 600 receives the location information of the terminal device 400 from the acquisition device 500. The control device 600 selects one of the multiple groups 300 to be used for relaying between the base station device 100 and the terminal device 400 according to the location information of the terminal device 400. This is equivalent to selecting two or more relay devices 200 to be used for relaying among the multiple relay devices 200. The details of this process will be described later, but when the terminal device 400 is located at position P3, the control device 600 selects the second group 300b. As a result, the fourth relay device 200d to the sixth relay device 200f perform relaying.

The control device 600 controls the antenna directivity of the base station device 100 so that it is directed from the fourth relay device 200d of the selected second group 300b to the sixth relay device 200f. The base station device 100 controls the antenna directivity in response to an instruction from the control device 600.

The control device 600 also controls the terminal-side antenna directivity of the selected fourth relay device 200d to sixth relay device 200f of the second group 300b so that it is directed toward the terminal device 400. On the other hand, the base station-side antenna directivity of the selected fourth relay device 200d to sixth relay device 200f of the second group 300b may be fixed so that it is directed toward the base station device 100. This is because the relative positional relationship between these devices and the base station device 100 is fixed. Of the multiple relay devices 200, the selected fourth relay device 200d to sixth relay device 200f control their antenna directivity in response to instructions from the control device 600.

The antenna directivity of the base station device 100 and the antenna directivity on the terminal side of the fourth relay device 200d to the sixth relay device 200f of the second group 300b are controlled, so that the loss of millimeter waves is suppressed by a high-gain beam. In addition, a propagation path is formed from the base station device 100 to the terminal device 400 via the fourth relay device 200d, a propagation path from the base station device 100 to the terminal device 400 via the fifth relay device 200e, and a propagation path is formed from the base station device 100 to the terminal device 400 via the sixth relay device 200f. In this way, multiple propagation paths are formed, so that spatial correlation is low and MIMO transmission is possible.

Here, it is assumed that the terminal device 400 moves along the arrow in the order of positions P1, P2, ..., P6. When the terminal device 400 is at position P1, it transmits position information indicating position P1. When the control device 600 moves from position P1 to positions P2, ..., P6, the position information transmitted from the terminal device 400 changes to the order of positions P2, ..., P6. When the position information indicates position P1 or P2, the control device 600 selects the first group 300a, when the position information indicates position P1 or P2, the control device 600 selects the second group 300b, when the position information indicates position P3 or P4, and the control device 600 selects the third group 300c, when the position information indicates position P5 or P6. In other words, the control device 600 changes two or more relay devices 200 to be used for relaying among the multiple relay devices 200 in accordance with the movement of the terminal device 400.

When the control device 600 selects the first group 300a, it controls the antenna directivity of the base station device 100 so that it is directed from the first relay device 200a of the selected first group 300a to the third relay device 200c. As described above, when the control device 600 selects the second group 300b, it controls the antenna directivity of the base station device 100 so that it is directed from the fourth relay device 200d of the selected second group 300b to the sixth relay device 200f. When the control device 600 selects the third group 300c, it controls the antenna directivity of the base station device 100 so that it is directed from the seventh relay device 200g of the selected third group 300c to the ninth relay device 200i. The base station device 100 controls the antenna directivity in response to an instruction from the control device 600. In this way, when two or more relay devices 200 selected in the control device 600 are changed, the base station device 100 changes the antenna directivity so that it is directed to the changed two or more relay devices 200.

On the other hand, even if the control device 600 selects, for example, the first group 300a, the relative position of the terminal device 400 with respect to the first relay device 200a to the third relay device 200c is different between when the terminal device 400 is at position P1 and when the terminal device 400 is at position P2. Therefore, when the position information indicates position P1 or P2, the control device 600 changes the antenna orientation of the terminal side from the first relay device 200a to the third relay device 200c. Specifically, when the position information indicates position P1, the control device 600 controls the antenna orientation of the terminal side from the first relay device 200a to the third relay device 200c so as to face position P1. Also, when the position information indicates position P2, the control device 600 controls the antenna orientation of the terminal side from the first relay device 200a to the third relay device 200c so as to face position P2. The first relay device 200a to the third relay device 200c change the antenna direction of the terminal in response to an instruction from the control device 600. The same applies when another group is selected.

Figure 2 shows a detailed configuration of the communication system 1000. The communication system 1000 includes a base station device 100, a relay device 200, a terminal device 400, an acquisition device 500, and a control device 600. The relay device 200 is any one of the multiple relay devices 200 shown in Figure 1. The base station device 100 includes a control unit 110, a processing unit 112, a communication unit 114, and a first antenna 116a, ..., a Kth antenna 116k, collectively referred to as antennas 116. The relay device 200 includes a control unit 210, first base station side antennas 212a, ..., Lth base station side antennas 212l collectively referred to as base station side antennas 212, first base station side phase shifters 214a, ..., Lth base station side phase shifter 214l collectively referred to as base station side phase shifter 214, a base station side processing unit 216, an amplifier 218, a terminal side processing unit 220, first terminal side phase shifters 222a, ..., Mth terminal side phase shifter 222m collectively referred to as terminal side phase shifter 222, and first terminal side antennas 224a, ..., Mth terminal side antenna 224m collectively referred to as terminal side antenna 224. The terminal device 400 includes a positioning unit 410, a second communication unit 412, first antennas 414a, ..., Nth antenna 414n collectively referred to as antennas 414, a first communication unit 416, a processing unit 418, and a control unit 420. The control device 600 includes an input unit 610, a memory unit 612, a processing unit 614, and an output unit 616.

The positioning unit 410 of the terminal device 400 includes a positioning function using GNSS, and locates the current position of the terminal device 400. Since a known technology may be used for the positioning function using GNSS, a description thereof will be omitted here. The positioning unit 410 outputs the position information to the second communication unit 412. The second communication unit 412 includes a communication function such as 4G, and transmits the position information.

The input unit 610 of the control device 600 receives the location information of the terminal device 400 via the acquisition device 500. The input unit 610 outputs the location information to the processing unit 614. The storage unit 612 stores a table for selecting a group 300 to be used for relaying. FIG. 3 shows the data structure of the table stored in the storage unit 612. The table shows a combination of a group 300 to be selected, a relay phase shift value, and a base station phase shift value for each region. Here, the group 300 corresponds to information on two or more relay devices 200 to be selected, the relay phase shift value corresponds to information on directivity at the two or more relay devices 200, and the base station phase shift value corresponds to information on directivity of the base station device 100 to the two or more relay devices 200.

Furthermore, the regions are defined with respect to the location information, and are shown as in FIG. 4. FIG. 4 shows the regions defined in the communication system 1000. As an example, regions in which the angular range seen from the relay device 200 is smaller than the half-width of the antenna directivity are arranged consecutively. These regions are shown as "region 11". The size of the regions is not limited to the above-mentioned sizes, and regions of different sizes may be mixed. Each region includes location information. Return to FIG. 2.

The processing unit 614 selects a combination of group 300, relay phase shift value, and base station phase shift value corresponding to the area containing the received location information by referring to the table stored in the memory unit 612. The processing unit 614 outputs the combination of group 300, relay phase shift value, and base station phase shift value to the output unit 616. The output unit 616 transmits the base station phase shift value to the base station device 100, and transmits the relay phase shift value to the relay device 200 of the selected group 300.

The control unit 110 of the base station device 100 receives a base station phase shift value from the control device 600. The processing unit 112 receives a signal to be transmitted from the outside and performs signal processing such as modulation and error correction on the information. The processing unit 112 outputs the processed signal (hereinafter also referred to as "signal") to the communication unit 114.

The first antenna 116a to the K-th antenna 116k are connected to the communication unit 114. The first antenna 116a to the K-th antenna 116k are, for example, planar patch antenna elements arranged two-dimensionally. The communication unit 114 performs hybrid beamforming using the first antenna 116a to the K-th antenna 116k. Hybrid beamforming can be of a full array type that uses all antennas 116, or a subarray type that uses some of the antennas 116. Full-array hybrid beamforming requires an adder and many variable phase shifters compared to subarray hybrid beamforming, but has high performance, so full-array hybrid beamforming is used as an example.

The communication unit 114 receives base station phase shift values from the control unit 110 and receives signals from the processing unit 112. The communication unit 114 performs precoding for MIMO on the signals and transmits the signals while performing hybrid beamforming by changing the phase using phase shifters connected to each antenna 116. The base station phase shift values received from the control unit 110 include phase shift values for each antenna 116, and the communication unit 114 sets phase shift values in each phase shifter. By setting such phase shift values, the communication unit 114 forms a beam that points from the first relay device 200a to the third relay device 200c when, for example, the first group 300a in FIG. 1 is selected.

The control unit 210 of the relay device 200 executes relay processing when it receives a relay phase-shift value from the control device 600. On the other hand, the control unit 210 does not execute relay processing when it does not receive a relay phase-shift value from the control device 600. The following describes the case where the information of the group 300 and the relay phase-shift value are received from the control device 600.

The first base station antenna 212a to the Lth base station antenna 212l receive signals from the base station device 100. Here, the base station antennas 212 and the base station phase shifters 214 are connected one-to-one so that the first base station antenna 212a is connected to the first base station phase shifter 214a, and each base station phase shifter 214 is connected to the base station processing unit 216. Phase shift values for forming beams that point toward the base station device 100 are set in advance in the first base station phase shifter 214a to the Lth base station phase shifter 214l. The base station processing unit 216 combines the signals received by each base station antenna 212 and whose phases have been changed by each base station phase shifter 214.

The amplifier 218 is disposed between the base station side processing unit 216 and the terminal side processing unit 220, and amplifies the signal (hereinafter also referred to as the "signal") combined in the base station side processing unit 216. The amplifier 218 outputs the amplified signal (hereinafter also referred to as the "signal") to the terminal side processing unit 220. The first terminal side phase shifter 222a to the Mth terminal side phase shifter 222m are connected to the terminal side processing unit 220, and the terminal side processing unit 220 distributes the signal from the amplifier 218 to the first terminal side phase shifter 222a to the Mth terminal side phase shifter 222m.

The terminal side phase shifter 222 and the terminal side antenna 224 are connected one-to-one so that the first terminal side phase shifter 222a is connected to the first terminal side antenna 224a. The relay phase shift value received by the control unit 210 includes a phase shift value for each terminal side phase shifter 222, and a phase shift value is set for each terminal side phase shifter 222. By setting such phase shift values, a beam is formed that faces the terminal device 400. In this state, the first terminal side antenna 224a to the Mth terminal side antenna 224m transmit signals. Here, the multiple base station side antennas 212, the multiple base station side phase shifters 214, the base station side processing unit 216, the multiple terminal side antennas 224, the multiple terminal side phase shifters 222, the terminal side processing unit 220, and the amplifier 218 process analog signals.

The first antenna 414a to the Nth antenna 414n of the terminal device 400 receive signals from the base station device 100. The antenna 414 is, for example, a sector antenna. For example, when the first group 300a in FIG. 1 is selected, the first communication unit 416 controls the directivity of the first antenna 414a to the Nth antenna 414n so that they face the first relay device 200a to the third relay device 200c. The first communication unit 416 also performs postcoding on the signal received at each antenna 414. The first communication unit 416 outputs the signal on which postcoding has been performed (hereinafter, also referred to as "signal") to the processing unit 418. The processing unit 418 performs signal processing such as demodulation and error correction decoding, and outputs the result. Such processing in the terminal device 400 is the same as the processing in the case where the relay device 200 does not exist and the terminal device 400 directly communicates with the base station device 100.

In terms of hardware, this configuration can be realized by any computer's CPU (Central Processing Unit), memory, and other LSIs (Large Scale Integration), and in terms of software, it can be realized by programs loaded into memory, but here we are depicting functional blocks that are realized by the cooperation of these. Therefore, those skilled in the art will understand that these functional blocks can be realized in various ways by hardware alone, or a combination of hardware and software.

In the following, the processing in such a communication system 1000 will be theoretically explained in the following order: (1) analog relay node, (2) received signal model, (3) artificial MIMO channel response, (4) channel matrix, (5) determination of communication capacity and directivity selection matrix, (6) directivity pattern candidates of the base station device 100, and (7) determination of selection matrix α.
(1) Analog Relay Node Each analog relay node, that is, relay device 200, includes an access side (terminal side) and a backhaul side (base station side). Since each relay device 200 knows the position of the base station device 100, the directivity is fixed in advance. On the other hand, the terminal side needs to actively control the directivity according to the position of the terminal device 400, and for example, it is assumed that the directivity can be ideally controlled to the terminal device 400.

ここで、Ｈ_０（ｔ）は伝搬路行列であり、Ｗ_ａはアナログビームフォーミングウェイト行列であり、Ｗ_ｄはディジタルプリ／ポストコーディングウェイト行列である。ｓ_ＢＳ（ｔ）は基地局装置１００の送信信号ベクトルであり、ｎ_ＵＥは端末装置４００での雑音信号ベクトルであり、ｎ_{ＲＳ，ｅｆｆ}（ｔ）はすべての中継装置２００から伝送される雑音の総和である。 (2) Received signal model As described above, hybrid beamforming, which combines analog beamforming and digital precoding/postcoding, is used as an efficient means for realizing massive MIMO transmission. The received signal model at time t in a single-user massive MIMO system is expressed as follows.

Here, H ₀ (t) is a channel matrix, W _a is an analog beamforming weight matrix, W _d is a digital pre/post coding weight matrix, _{s BS} (t) is a transmission signal vector of the base station device 100, n _UE is a noise signal vector at the terminal device 400, and n _RS,eff (t) is the sum of noise transmitted from all relay devices 200.

ｈ^ｉ _ＲＢ（ψ_ＢＳ，ｔ）は基地局装置１００から第ｉ中継装置２００ｉのチャネル応答であり、ｈ^ｉ _ＵＲ（ψ_ＵＥ，ｔ）は第ｉ中継装置２００ｉから端末装置４００までのチャネル応答である。また、ｉは、図１における第９中継装置２００ｉとは異なり、中継装置２００のインデックスを表し、１≦ｉ≦Ｎ_ＲＳであり、Ｎ_ＲＳは中継装置２００のノード数である。ψ_ＢＳ＝（θ_ＢＳ，φ_ＢＳ）、ψ_ＵＥ＝（θ_ＵＥ，φ_ＵＥ）、ψ_ＲＢ＝（θ_ＲＢ，φ_ＲＢ）、ψ_ＵＲ＝（θ_ＵＲ，φ_ＵＲ）はそれぞれ基地局装置１００、端末装置４００、中継装置２００(基地局側)、中継装置２００(端末側)の球座標系における発射角・到来角である。また、ｇ^ｉ _ＲＳ，ｒ（ψ_ＲＢ）、ｇ^ｉ _ＲＳ，ｔ（ψ_ＵＲ）はそれぞれ中継装置２００(基地局側)、中継装置２００(端末側)の指向性パターンベクトルである。 (3) Artificial MIMO Channel Response The artificially generated channel response by millimeter wave massive analog relay MIMO is expressed as follows.

h ⁱ _RB (ψ _BS , t) is the channel response from the base station device 100 to the i-th relay device 200i, and h ⁱ _UR (ψ _UE , t) is the channel response from the i-th relay device 200i to the terminal device 400. Also, i represents the index of the relay device 200, unlike the 9th relay device 200i in FIG. 1, where 1≦i≦N _RS and N _RS is the number of nodes of the relay device 200. ψ _BS = (θ _BS , φ _BS ), ψ _UE = (θ _UE , φ _UE ), ψ _RB = (θ _RB , φ _RB ), and ψ _UR = (θ _UR , φ _UR ) are the angles of emission and arrival in the spherical coordinate system of the base station device 100, the terminal device 400, the relay device 200 (base station side), and the relay device 200 (terminal side), respectively. Also, g ⁱ _RS,r (ψ _RB ) and g ⁱ _RS,t (ψ _UR ) are the directivity pattern vectors of the relay device 200 (base station side) and the relay device 200 (terminal side), respectively.

h ⁱ _RB (ψ _RB , ψ _BS , t) and h ⁱ _UR (ψ _UE , ψ _UR , t) are the channel responses of the base station device 100-i-th relay device 200i and the i-th relay device 200i-terminal device 400, respectively. ^{h i} _URB (ψ _UE , ψ _BS , t) and h _UB (ψ _UE , ψ _BS , t) are the channel responses of the base station device 100-i-th relay device 200i-terminal device 400 and the base station device 100-terminal device 400, respectively, not passing through the relay device 200. β ⁱ is the coefficient of amplitude amplification of the i-th relay device 200i. h _URB (ψ _UE , ψ _BS , t) is the channel response taking all relay devices 200 into consideration.

ここで、αは各ビーム候補の選択行列であり、次のように示される。

Ｍ^＊は選択した基地局装置１００のビーム数、α_ｍは各ビームを選択するか否かを表す。 (4) Propagation Path Matrix The propagation path matrix H(t) including the directivity of the antenna 116 of the base station device 100 and the directivity of the antenna 414 of the terminal device 400 is expressed as follows.

Here, α is the selection matrix for each beam candidate, and is expressed as follows:

M ^* indicates the number of beams of the selected base station device 100, and α _m indicates whether or not each beam is to be selected.

Ｂ_ｗは帯域幅、Ｐ_ｓは送信電力、Ｐ_ｎ，ＵＥは端末装置４００の雑音電力、Ｐ_ｎ，ＲＳは端末装置４００で受信されるすべての中継装置２００から伝送される雑音電力である。ｇ^＊ _ＢＳ，ｇ_ＵＥはそれぞれ基地局装置１００、端末装置４００の指向性パターンベクトルである。Ｎ_ＢＳ、Ｎ_ＵＥはそれぞれ基地局装置１００、端末装置４００のアンテナ素子数である。 (5) Determination of communication capacity and directivity selection matrix Using the propagation path matrix, the upper limit of the communication capacity according to the Shannon capacity formula can be expressed as follows.

_Bw is the bandwidth, _Ps is the transmission power, Pn _,UE is the noise power of the terminal device 400, and Pn _,RS is the noise power transmitted from all relay devices 200 and received by the terminal device 400. g ^* _BS and _gUE are the directivity pattern vectors of the base station device 100 and the terminal device 400, respectively. _NBS and _NUE are the numbers of antenna elements of the base station device 100 and the terminal device 400, respectively.

The beam selection matrix α is determined as follows: The determined directivity of the base station apparatus 100 is expressed as follows: α ^* that maximizes the communication capacity is determined, and g ^* _BS (ψ _BS ) is the finally determined directivity pattern vector of the base station apparatus 100 .

(6) Directivity Pattern Candidates of the Base Station Device 100 The directivity pattern vector g _BS and analog beamforming weight matrix W _a of the base station device 100 will be described. The base station device 100 prepares a discrete Fourier transform (DFT) matrix D in advance and selects a beam from it. Here, a is a coefficient that determines the distance between beams. The weight vector obtained by this DFT multiplied by the directivity of each antenna element forms each beam pattern.

(7) Determination of Selection Matrix α Beam selection by the base station device 100 will be described. An analog beamforming matrix g _BS is generated in advance, and beams are selected from it in a sequential manner so as to maximize communication capacity. The directivity of the base station device 100 is selected in a sequential manner so as to maximize communication capacity for each number of selected beams. The optimal number of streams (number of beams) is determined by sequentially increasing the number of streams.

The operation of the communication system 1000 configured as above will now be described. FIG. 5 is a flowchart showing the processing procedure performed by the control device 600. The input unit 610 acquires the location information of the terminal device 400 (S10). The processing unit 614 selects a group 300 from the location information based on the table stored in the storage unit 612 (S12). The output unit 616 outputs the relay phase shift value to the relay device 200 included in the group 300 (S14), and outputs the base station phase shift value corresponding to the group 300 to the base station device 100 (S16).

(Variation 1)
6 shows a configuration of a communication system 1000. The communication system 1000 includes a first relay device 200a, a second relay device 200b, a third relay device 200c, a terminal device 400, an acquisition device 500, and a control device 600.

In FIG. 6, the first relay device 200a to the third relay device 200c included in one group are selected by the control device 600. Here, a propagation path (hereinafter referred to as the "first propagation path") from the base station device 100 to the terminal device 400 via the first relay device 200a and the second relay device 200b, and a propagation path (hereinafter referred to as the "second propagation path") from the base station device 100 to the terminal device 400 via the third relay device 200c are formed. The processing of the third relay device 200c in the second propagation path is the same as in FIG. 1. On the other hand, in the first propagation path, the first relay device 200a relays between the base station device 100 and the second relay device 200b, and the second relay device 200b relays between the first relay device 200a and the terminal device 400. In other words, the first relay device 200a and the second relay device 200b perform multi-hop between the base station device 100 and the terminal device 400. The number of relay devices 200 performing multi-hop is not limited to "2".

In this case, the antenna directivity on the second relay device 200b side of the first relay device 200a is controlled to face the second relay device 200b. Also, the antenna directivity on the first relay device 200a side of the second relay device 200b is controlled to face the first relay device 200a. This control may be performed based on the phase shift value included in the table stored in the storage unit 612 (not shown) of the control device 600, as in FIG. 2. Also, the antenna directivity on the second relay device 200b side of the first relay device 200a and the antenna directivity on the first relay device 200a side of the second relay device 200b may be fixed.

(Variation 2)
7 shows a configuration of a communication system 1000. The communication system 1000 includes a base station device 100, a first relay device 200a to a fourth relay device 200d collectively referred to as relay devices 200, a first terminal device 400a and a second terminal device 400b collectively referred to as terminal devices 400, an acquisition device 500, and a control device 600.

The input unit 610 (not shown) of the control device 600 receives the location information of the first terminal device 400a and the location information of the second terminal device 400b from the acquisition device 500. In the table of the storage unit 612 (not shown), the group 300 to be used for relaying the first terminal device 400a, the relay phase shift value and the base station phase shift value in the group 300, the group 300 to be used for relaying the second terminal device 400b, and the relay phase shift value and the base station phase shift value in the group 300 are shown so as to correspond to the combination of the location information of the first terminal device 400a and the location information of the second terminal device 400b. Each of the location information of the first terminal device 400a and the location information of the second terminal device 400b may be shown as an area as before. These tables are created so that interference is reduced even if relaying for the first terminal device 400a and the second terminal device 400b occurs at the same timing with the same frequency carrier. For example, simulation calculations are used to create the table.

The processing unit 614 (not shown) selects from the table the group 300 to be used for relaying the first terminal device 400a, the relay phase shift value and the base station phase shift value in the group 300, and the group 300 to be used for relaying the second terminal device 400b, and the relay phase shift value and the base station phase shift value in the group 300. This corresponds to selecting the first relay device 200a and the second relay device 200b of the first group 300a according to the position of the first terminal device 400a, and selecting the third relay device 200c and the fourth relay device 200d of the second group 300b according to the position of the second terminal device 400b.

The output unit 616 (not shown) transmits the base station phase shift value for the first group 300a to the base station device 100, and transmits the relay phase shift value to the first relay device 200a and the second relay device 200b of the first group 300a. The output unit 616 also transmits the base station phase shift value for the second group 300b to the base station device 100, and transmits the relay phase shift value to the third relay device 200c and the fourth relay device 200d of the second group 300b.

The base station device 100 controls the directivity so that it is directed toward the first relay device 200a and the second relay device 200b of the first group 300a, and also controls the directivity so that it is directed toward the third relay device 200c and the fourth relay device 200d of the second group 300b. The first relay device 200a and the second relay device 200b of the first group 300a control their directivity so that it is directed toward the first terminal device 400a. In addition, the third relay device 200c and the fourth relay device 200d of the second group 300b control their directivity so that it is directed toward the second terminal device 400b.

(Variation 3)
8 shows a configuration of a communication system 1000. The communication system 1000 includes a first base station device 100a and a second base station device 100b collectively referred to as a base station device 100, a first relay device 200a to a fourth relay device 200d collectively referred to as relay devices 200, a first terminal device 400a and a second terminal device 400b collectively referred to as a terminal device 400, an acquisition device 500, and a control device 600.

The input unit 610 (not shown) of the control device 600 receives the location information of the first terminal device 400a and the location information of the second terminal device 400b from the acquisition device 500. In the table of the storage unit 612 (not shown), the base station device 100 and the group 300 to be used for communication (relay) with the first terminal device 400a, the relay phase shift value and the base station phase shift value in these, and the base station device 100 and the group 300 to be used for communication (relay) with the second terminal device 400b, and the relay phase shift value and the base station phase shift value in these are shown so as to correspond to the combination of the location information of the first terminal device 400a and the location information of the second terminal device 400b. The relay phase shift value also includes the phase shift value for the base station side phase shifter 214 in the relay device 200. Each of the location information of the first terminal device 400a and the location information of the second terminal device 400b may be shown as a region as before. These tables are created so that interference is reduced even if relays to the first terminal device 400a and the second terminal device 400b occur at the same timing using the same frequency carrier. The tables are created using, for example, simulation calculations.

The processing unit 614 (not shown) selects, from the table based on the combination of the position of the first terminal device 400a and the position of the second terminal device 400b, the base station device 100 and the group 300 to be used for communication (relay) with the first terminal device 400a, the relay phase shift value and the base station phase shift value for these, and the base station device 100 and the group 300 to be used for communication (relay) with the second terminal device 400b, the relay phase shift value and the base station phase shift value for these. This corresponds to selecting the first relay device 200a and the second relay device 200b of the first base station device 100a and the first group 300a according to the position of the first terminal device 400a, and selecting the third relay device 200c and the fourth relay device 200d of the second base station device 100b and the second group 300b according to the position of the second terminal device 400b.

The output unit 616 (not shown) transmits the base station phase shift value for the first base station device 100a to the first base station device 100a, and transmits the relay phase shift value to the first relay device 200a and the second relay device 200b of the first group 300a. The output unit 616 also transmits the base station phase shift value for the second base station device 100b to the second base station device 100b, and transmits the relay phase shift value to the third relay device 200c and the fourth relay device 200d of the second group 300b.

The first base station device 100a controls the directivity so that it is directed toward the first relay device 200a and the second relay device 200b of the first group 300a. The first relay device 200a and the second relay device 200b of the first group 300a control the directivity so that it is directed toward the first base station device 100a, and also control the directivity so that it is directed toward the first terminal device 400a. The second base station device 100b controls the directivity so that it is directed toward the third relay device 200c and the fourth relay device 200d of the second group 300b. The third relay device 200c and the fourth relay device 200d of the second group 300b control the directivity so that it is directed toward the second base station device 100b, and also control the directivity so that it is directed toward the second terminal device 400b. As a result, interference is reduced between the first communication area 700a, which includes the propagation path from the first base station device 100a to the first terminal device 400a, and the second communication area 700b, which includes the propagation path from the second base station device 100b to the second terminal device 400b.

According to this embodiment, two or more relay devices to be used for relaying are selected according to the position of the terminal device, the directivity is controlled so that the base station device is directed to two or more relay devices, and the directivity is controlled so that the two or more relay devices are directed to the terminal device, so a high-gain beam can be formed. In addition, since a high-gain beam is formed, the loss of millimeter waves can be reduced. In addition, since two or more relay devices to be used for relaying are selected according to the position of the terminal device, the directivity is controlled so that the base station device is directed to two or more relay devices, and the directivity is controlled so that the two or more relay devices are directed to the terminal device, the spatial correlation can be reduced. In addition, since the spatial correlation is reduced, the communication capacity can be increased by MIMO transmission. In addition, since the loss of millimeter waves is reduced and the communication capacity is increased, the communication capacity can be increased under conditions where the influence of direct waves is dominant.

In addition, since the multiple base station side antennas, multiple base station side phase shifters, base station side processing unit, multiple terminal side antennas, multiple terminal side phase shifters, terminal side processing unit, and amplifier process analog signals, processing delays in the relay device can be reduced. Furthermore, when the terminal device moves, two or more relay devices are changed, the directivity from the base station device to two or more relay devices is changed, and the directivity from the two or more relay devices to the terminal device is changed, so the beam direction can follow the movement of the terminal device. Furthermore, information on the two or more relay devices to be selected, information on the directivity at the two or more relay devices, and information on the directivity of the base station device to the two or more relay devices are selected from a table, so processing can be simplified.

In addition, since two or more relay devices perform multi-hop between the base station device and the terminal device, the distance between the base station device and the terminal device can be increased. In addition, since a relay device and directivity are selected for each of the two terminal devices, relaying to the two terminal devices can be performed while reducing interference between the two terminal devices. In addition, information on two or more relay devices to be selected as the first group, information on directivity at two or more relay devices in the first group, information on the directivity of the base station device to two or more relay devices in the first group, information on two or more relay devices to be selected as the second group, information on directivity at two or more relay devices in the second group, and information on the directivity of the base station device to two or more relay devices in the second group are selected from a table, making processing simple.

In addition, since a base station device, a relay device, and directivity are selected for each of the two terminal devices, relaying to the two terminal devices can be performed while reducing interference between the two terminal devices. Furthermore, information on the base station device and two or more relay devices to be selected as the first group, information on the directivity of the two or more relay devices in the first group, information on the directivity of the base station device to the two or more relay devices in the first group, information on the base station device and two or more relay devices to be selected as the second group, information on the directivity of the two or more relay devices in the second group, and information on the directivity of the base station device to the two or more relay devices in the second group are selected from a table, simplifying processing.

The present invention has been described above based on examples. These examples are merely illustrative, and those skilled in the art will understand that various modifications are possible in the combination of each component and each treatment process, and that such modifications are also within the scope of the present invention.

100 base station device, 110 control unit, 112 processing unit, 114 communication unit, 116 antenna, 200 relay device, 210 control unit, 212 base station side antenna, 214 base station side phase shifter, 216 base station side processing unit, 218 amplifier, 220 terminal side processing unit, 222 terminal side phase shifter, 224 terminal side antenna, 300 group, 400 terminal device, 410 positioning unit, 412 second communication unit, 414 antenna, 416 first communication unit, 418 processing unit, 420 control unit, 500 acquisition device, 600 control device, 610 input unit, 612 storage unit, 614 processing unit, 616 output unit, 700 communication area, 1000 communication system.

Claims (6)

A base station device,
A plurality of analog repeater devices capable of communicating with the base station device;
a terminal device that communicates with the base station device through relaying by at least two of the plurality of analog relay devices;
a control device for selecting two or more analog repeating devices to be used for relaying from among the plurality of analog repeating devices according to a location of the terminal device;
the base station device controls directivity so as to be directed toward two or more analog relay devices selected by the control device;
Two or more selected analog repeating devices among the plurality of analog repeating devices control directivity so as to be directed toward the terminal device ;
Each of the plurality of analog repeating devices comprises:
A plurality of base station side antennas;
a plurality of base station side phase shifters connected to the plurality of base station side antennas, respectively;
a base station side processing unit that combines signals from the plurality of base station side phase shifters;
A plurality of terminal side antennas;
a plurality of terminal-side phase shifters connected to the plurality of terminal-side antennas, respectively;
a terminal side processing unit that distributes signals to each of the plurality of terminal side phase shifters;
an amplifier disposed between the base station side processing unit and the terminal side processing unit,
A communication system characterized in that the plurality of base station side antennas, the plurality of base station side phase shifters, the base station side processing unit, the plurality of terminal side antennas, the plurality of terminal side phase shifters, the terminal side processing unit, and the amplifier process analog signals . The terminal device is movable,
When the location of the terminal device is changed, the control device changes two or more analog repeating devices to be used for relaying among the plurality of analog repeating devices;
When two or more analog relay devices are changed, the base station device changes directivity so as to be directed toward the two or more changed analog relay devices in the control device;
2. The communication system according to claim 1 , wherein directivities of two or more of said analog repeating devices that have been changed among said plurality of analog repeating devices are controlled so as to be directed toward said terminal device. 3. The communication system according to claim 1, wherein two or more of the plurality of analog repeater devices execute a multi-hop between the base station device and the terminal device. A base station device,
A plurality of analog repeater devices capable of communicating with the base station device;
a terminal device that communicates with the base station device through relaying by at least two of the plurality of analog relay devices;
a control device for selecting two or more analog repeating devices to be used for relaying from among the plurality of analog repeating devices according to a location of the terminal device;
the base station device controls directivity so as to be directed toward two or more analog relay devices selected by the control device;
Two or more selected analog repeating devices among the plurality of analog repeating devices control directivity so as to be directed toward the terminal device ;
The control device stores a table showing information on two or more analog relay devices to be selected in correspondence with the position of the terminal device, information on directivity at the two or more analog relay devices, and information on directivity of the base station device to the two or more analog relay devices;
The control device selects, from the table based on the position of the terminal device, information on two or more analog relay devices to be selected, information on directivity at the two or more analog relay devices, and information on directivity of the base station device to the two or more analog relay devices;
A communication system according to claim 1, wherein the control device outputs directivity information to each of the selected two or more analog repeater devices, and also outputs the directivity information to the base station device . A base station device,
A plurality of analog repeater devices capable of communicating with the base station device;
a terminal device that communicates with the base station device through relaying by at least two of the plurality of analog relay devices;
a control device for selecting two or more analog repeating devices to be used for relaying from among the plurality of analog repeating devices according to a location of the terminal device;
the base station device controls directivity so as to be directed toward two or more analog relay devices selected by the control device;
Two or more selected analog repeating devices among the plurality of analog repeating devices control directivity so as to be directed toward the terminal device ;
The terminal devices include a first terminal device and a second terminal device,
The control device selects, according to a location of the first terminal device, two or more analog relay devices to be used for relaying the first terminal device from among the plurality of analog relay devices as a first group of analog relay devices, and selects, according to a location of the second terminal device, two or more analog relay devices to be used for relaying the second terminal device from among the plurality of analog relay devices as a second group of analog relay devices;
the base station device controls directivity so as to be directed toward two or more analog repeater devices of the first group, and also controls directivity so as to be directed toward two or more analog repeater devices of the second group;
Among the plurality of analog repeating devices, two or more analog repeating devices in a first group are controlled in directivity so as to be directed toward the first terminal device;
Among the plurality of analog repeating devices, two or more analog repeating devices in a second group are controlled in directivity so as to be directed toward the second terminal device;
The control device stores a table showing information on two or more analog relay devices to be selected as a first group, information on directivity at the two or more analog relay devices in the first group, information on directivity of the base station device to the two or more analog relay devices in the first group, information on two or more analog relay devices to be selected as a second group, information on directivity at the two or more analog relay devices in the second group, and information on directivity of the base station device to the two or more analog relay devices in the second group, so as to correspond to a combination of a location of the first terminal device and a location of the second terminal device;
The control device selects, from the table based on a combination of the location of the first terminal device and the location of the second terminal device, information on two or more analog repeater devices to be selected as a first group, information on directivity at the two or more analog repeater devices in the first group, information on directivity of the base station device to the two or more analog repeater devices in the first group, information on two or more analog repeater devices to be selected as a second group, information on directivity at the two or more analog repeater devices in the second group, and information on directivity of the base station device to the two or more analog repeater devices in the second group;
The control device outputs directivity information to each of the selected two or more analog repeater devices of the first group, and outputs directivity information to the two or more analog repeater devices of the first group to the base station device;
A communication system characterized in that the control device outputs directivity information to each of the selected two or more analog repeater devices in the second group, and outputs directivity information to the two or more analog repeater devices in the second group to the base station device . A base station device,
A plurality of analog repeater devices capable of communicating with the base station device;
a terminal device that communicates with the base station device through relaying by at least two of the plurality of analog relay devices;
a control device for selecting two or more analog repeating devices to be used for relaying from among the plurality of analog repeating devices according to a location of the terminal device;
the base station device controls directivity so as to be directed toward two or more analog relay devices selected by the control device;
Two or more selected analog repeating devices among the plurality of analog repeating devices control directivity so as to be directed toward the terminal device ;
the base station device includes a first base station device and a second base station device;
the terminal devices include a first terminal device communicating with the first base station device and a second terminal device communicating with the second base station device;
The control device selects, according to a location of the first terminal device, two or more analog relay devices to be used for relaying the first terminal device from among the plurality of analog relay devices as a first group of analog relay devices, and selects, according to a location of the second terminal device, two or more analog relay devices to be used for relaying the second terminal device from among the plurality of analog relay devices as a second group of analog relay devices;
the first base station device controls directivity so as to be directed toward two or more analog relay devices of the first group;
the second base station device controls directivity so as to be directed toward two or more analog relay devices of the second group;
Among the plurality of analog relay devices, two or more analog relay devices in a first group control directivity so as to be directed toward the first base station device, and also control directivity so as to be directed toward the first terminal device;
Among the plurality of analog repeater devices, two or more analog repeater devices in a second group control directivity so as to be directed toward the second base station device, and also control directivity so as to be directed toward the second terminal device;
The control device stores a table showing information on the first base station device, information on two or more analog relay devices to be selected as a first group, information on directivity at the two or more analog relay devices in the first group, information on directivity of the first base station device to the two or more analog relay devices in the first group, information on the second base station device, information on the two or more analog relay devices to be selected as a second group, information on directivity at the two or more analog relay devices in the second group, and information on directivity of the second base station device to the two or more analog relay devices in the second group, so as to correspond to a combination of a location of the first terminal device and a location of the second terminal device,
The control device selects, from the table based on a combination of the location of the first terminal device and the location of the second terminal device, information on the first base station device, information on two or more analog relay devices to be selected as a first group, information on directivity at the two or more analog relay devices in the first group, information on directivity of the first base station device to the two or more analog relay devices in the first group, information on the second base station device, information on the two or more analog relay devices to be selected as a second group, information on directivity at the two or more analog relay devices in the second group, and information on directivity of the second base station device to the two or more analog relay devices in the second group;
The control device outputs directivity information to each of the selected two or more analog repeater devices of the first group, and outputs directivity information to the two or more analog repeater devices of the first group to the first base station device;
A communication system characterized in that the control device outputs directivity information to each of the selected two or more analog repeater devices in the second group, and outputs directivity information to the two or more analog repeater devices in the second group to the second base station device .

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