Communication device and communication method

Abstract

To provide an optical space communication device, an optical space communication system, and an optical space communication method that can achieve power saving.SOLUTION: In an optical space communication system 400, each of an optical space communication device 1 and a communication partner optical communication device 101 comprises: a plurality of light-transmission / reception units 10-1 to 10-n, 130-1 to 130-n; and a communication control unit 20 that controls communication via the plurality of light-transmission / reception units. The communication control unit 20 determines a necessary communication capability for the communication and controls the number of light-transmission / reception units used for the communication on the basis of the necessary communication capability.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an optical space communications device, an optical space communications system, and an optical space communications method. [Background technology]

[0002] In the optical space communication technology, there is a mode in which spatial multiplexing transmission using multiple beams is realized, and examples using communication devices equipped with multiple transmitters and receivers are known. In addition, various ingenious communication devices and communication systems have been developed to reduce the circuit scale and number of devices that perform spatial multiplexing transmission.

[0003] Patent Document 1 discloses a technology for a receiving device for optical space communications in which the number of digital signal processing means that remove distortions and other impurities from digital signals is controlled differently depending on whether the number of input signals is large or small, thereby reducing the number of digital signal processing means. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. WO2017 / 169927 Summary of the Invention [Problem to be solved by the invention]

[0005] In an optical space communications device that has a plurality of transmitting and receiving units for performing spatial multiplexing transmission, an increase in power consumption becomes a problem.

[0006] Therefore, one aspect of the present invention has been made in consideration of the above problems, and one example of its purpose is to provide a technology that achieves power saving in an optical space communication device that performs spatial multiplexing transmission. [Means for solving the problem]

[0007] An optical space communications device according to one embodiment of the present invention comprises a plurality of light transmitting and receiving means and a communication control means for controlling communication via the plurality of light transmitting and receiving means, wherein the communication control means determines a required communication capacity for the communication and controls the number of the light transmitting and receiving means to be used for the communication based on the required communication capacity.

[0008] An optical space communication system according to one embodiment of the present invention includes a plurality of optical space communication devices, at least any of the plurality of optical space communication devices being equipped with a plurality of light transmitting and receiving means and a communication control means for controlling communication via the plurality of light transmitting and receiving means, and the communication control means determines a required communication capacity for the communication and controls the number of the light transmitting and receiving means to be used for the communication based on the required communication capacity.

[0009] An optical space communication method according to one embodiment of the present invention includes communicating via a plurality of light transmitting and receiving means and controlling the communication, where controlling the communication includes determining a required communication capacity for the communication and controlling the number of the light transmitting and receiving means to be used for the communication based on the required communication capacity.

[0010] One aspect of the present invention includes a program for causing a computer to operate as the optical space communications device. Effect of the Invention

[0011] According to one aspect of the present invention, it is possible to provide an optical space communications device, an optical space communications system, and an optical space communications method that realize power saving. [Brief description of the drawings]

[0012] [Figure 1] 1 is a block diagram showing a configuration of an optical space communications system including an optical space communications device according to a first exemplary embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram illustrating a process flow of an optical space communication method according to the first exemplary embodiment of the present invention. [Diagram 3]FIG. 11 is a block diagram showing a configuration of an optical space communications system including an optical space communications device according to an exemplary embodiment 2 of the present invention. [Figure 4] 11 is a block diagram showing a configuration of a light transmitting and receiving unit provided in an optical space communications device according to an exemplary embodiment 2 of the present invention. FIG. [Diagram 5] 11 is a block diagram showing the configuration of a communication control unit included in an optical space communications device according to an exemplary embodiment 2 of the present invention. FIG. [Figure 6] FIG. 11 is a diagram illustrating a process flow of an optical space communication method according to an exemplary embodiment 2 of the present invention. [Figure 7] FIG. 2 is a block diagram showing a hardware configuration of a computer that is an example of implementing an optical space communications device according to each exemplary embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Example Embodiment 1 A first exemplary embodiment of the present invention will be described in detail with reference to the drawings. This exemplary embodiment is a basic form of the exemplary embodiments described later.

[0014] (Configuration of Optical Space Communications System) The configuration of an optical space communication system including an optical space communication device according to this exemplary embodiment will be described with reference to Fig. 1. Fig. 1 is a block diagram showing the configuration of an optical space communication system 400. The optical space communication system 400 includes a plurality of optical space communication devices 1, 101, and realizes spatial multiplexing transmission by simultaneous connection of a plurality of beams. Although two optical space communication devices 1, 101 are illustrated in Fig. 1, the number is not limited to this. Note that the following description will be centered on one optical space communication device 1, and the other optical space communication device 101 will be described as an optical space communication device that is a communication partner of the optical space communication device 1, but these optical space communication devices 1, 101 can have the same configuration.

[0015] (Configuration of optical space communications device) 1, an optical space communications device 1 according to this exemplary embodiment includes a plurality of light transmitting and receiving units 10-1 to 10-n and a communications control unit 20. The plurality of light transmitting and receiving units 10-1 to 10-n and the communications control unit 20 are an example of the light transmitting and receiving means and the communications control means in the claims.

[0016] (Light transmitting / receiving units 10-1 to 10-n) Each of the multiple light transmitting and receiving units 10-1 to 10-n is configured to be capable of transmitting (sending light) an optical communication medium and receiving (receiving light) the optical communication medium. The optical communication medium transmitted from each of the multiple light transmitting and receiving units 10-1 to 10-n is received by each of the multiple light transmitting and receiving units 130-1 to 130-n of the optical space communications device 101 of the communication partner. Conversely, the optical communication medium transmitted from each of the multiple light transmitting and receiving units 130-1 to 130-n of the optical space communications device 101 of the communication partner is received by each of the multiple light transmitting and receiving units 10-1 to 10-n of the optical space communications device 1.

[0017] The optical communication medium used for transmission and reception is a directional optical communication medium, and a specific example thereof is, without being limited to the exemplary embodiment, an electromagnetic wave in a high frequency range having a frequency of about 10 GHz or more. The electromagnetic wave in the frequency range may include millimeter waves, submillimeter waves, infrared light, visible light, ultraviolet light, etc.

[0018] As an example, the light transmitting / receiving units 10-1 to 10-n are used for communication as the above-mentioned directional optical communication medium by directing and transmitting electromagnetic waves in the above-mentioned frequency range within a predetermined angle range. Here, the specific configuration for the light transmitting / receiving units 10-1 to 10-n to direct the electromagnetic waves in the above-mentioned frequency range does not limit this exemplary embodiment, but as an example, the light transmitting / receiving units 10-1 to 10-n are A beamforming antenna that directs and transmits millimeter and sub-millimeter waves within a specified angle range. Collimators for collimating infrared, visible, or ultraviolet light Laser oscillators that generate infrared, visible, or ultraviolet lasers A modulator that modulates a laser by changing the phase of a liquid crystal The configuration may include the following.

[0019] By directing and transmitting electromagnetic waves in the above frequency range, which is the optical communication medium, from the light transmitting and receiving units 10-1 to 10-n, the energy density of the optical communication medium increases, making it possible to communicate with a communication partner that is further away using the optical communication medium.

[0020] (Communication control unit 20) The communication control unit 20 controls communication via the multiple light transmitting and receiving units 10-1 to 10-n. Specifically, the communication control unit 20 determines a necessary communication capacity for the communication, and controls the number of the light transmitting and receiving units 10-1 to 10-n to be used for the communication based on the necessary communication capacity.

[0021] The required communication capacity can be predicted, for example, by regression analysis based on the communication capacity in past communications (at least one of the communication volume, noise volume, number of channel connections (number of light transmitting and receiving units used), etc.). The regression analysis may be performed by the communication control unit 20, or the communication control unit 20 may acquire the results of analysis performed by another configuration. The data based on past communications is, for example, past data for the same time period as the time of the intended communication.

[0022] The communication control unit 20 controls the number of light transmitting and receiving units 10-1 to 10-n to be used for communication based on the required communication capacity. The communication control unit 20 may continuously obtain the forecast of the required communication capacity or may obtain it periodically. The communication control unit 20 determines the number of light transmitting and receiving units 10-1 to 10-n to be used for communication by using a table or the like associated with the communication capacity.

[0023] The communication control unit 20 causes the determined light transmitting / receiving units 10-1 to 10-n to transmit and receive signals via the optical communication medium.

[0024] The light transmitting and receiving units 10-1 to 10-n may have different communication methods, or any two or more of the light transmitting and receiving units (for example, the light transmitting and receiving units 10-1 and 10-2) may have the same communication method, and the other light transmitting and receiving units may have a communication method different from the light transmitting and receiving units 10-1 and 10-2. In this case, the communication control unit 20 may control the number of light transmitting and receiving units to be used for communication from among the light transmitting and receiving units having the same communication method, based on the required communication capacity.

[0025] Alternatively, the light transmitting / receiving units 10-1 to 10-n may communicate at different wavelengths, or any of a plurality of light transmitting / receiving units (e.g., light transmitting / receiving units 10-1 and 10-2) may communicate at the same wavelength, while the other light transmitting / receiving units communicate at a wavelength different from that of the light transmitting / receiving units 10-1 and 10-2. In this case, the communication control unit 20 may control the number of light transmitting / receiving units to be used for communication from among the light transmitting / receiving units having the same wavelength, based on the required communication capacity.

[0026] As described above, the optical space communication device 1 according to this exemplary embodiment and the optical space communication system 400 including the optical space communication device 1 include a plurality of light transmitting and receiving units and a communication control unit 20 that controls communication via the plurality of light transmitting and receiving units, and the communication control unit 20 determines a necessary communication capacity for the communication and controls the number of light transmitting and receiving units to be used for the communication based on the necessary communication capacity. Therefore, according to this exemplary embodiment, it is possible to obtain an effect of realizing power saving by not using light transmitting and receiving units that are not necessary for communication.

[0027] (Flow of optical space communication method) The flow of the optical free space communication method S1 according to this exemplary embodiment will be described with reference to Fig. 2. Fig. 2 is a flow diagram showing the flow of the optical free space communication method S1.

[0028] As shown in FIG. 2, the optical free space communication method S1 includes controlling communication via a plurality of light transmitting and receiving means (communication control step, step S10), and this step S10 includes steps S11 and S12.

[0029] (Step S11) In step S11, the communication control unit 20 determines a communication capacity required for communication. The details of the required communication capacity and the determination have been described above, so a description thereof will be omitted here.

[0030] (Step S12) In step S12, the communication control unit 20 determines the number of light transmitting and receiving units 10-1 to 10-n to be used for communication, and controls the light transmitting and receiving units 10-1 to 10-n to be used to execute light transmitting and receiving processing. The specific processing content here has also been described above, so its description will be omitted here.

[0031] As described above, the optical space communication method S1 according to this exemplary embodiment includes controlling communication via a plurality of light transmitting and receiving units (S10), and controlling the communication (S10) includes determining a required communication capacity for the communication (S11) and controlling the number of the light transmitting and receiving means used for the communication based on the required communication capacity (S12). According to this exemplary embodiment, the light transmitting and receiving units not required for communication are controlled not to be used, so that it is possible to achieve an effect of realizing power saving.

[0032] Exemplary embodiment 2 A second exemplary embodiment of the present invention will be described in detail with reference to the drawings. Note that components having the same functions as those described in the first exemplary embodiment are given the same reference numerals, and the description thereof will be omitted as appropriate.

[0033] (Configuration of Optical Space Communications System) A configuration of an optical space communication system including an optical space communication device according to this exemplary embodiment will be described with reference to FIG. 3. FIG. 3 is a block diagram showing a configuration of an optical space communication system 400. The optical space communication system 400 is a system that realizes spatial multiplexing transmission, including a first optical space communication device 1 including a plurality of light transmitting and receiving units 10-1 to 10-n, and a second optical space communication device 101 including a plurality of light transmitting and receiving units 130-1 to 130-n corresponding to the plurality of light transmitting and receiving units 10-1 to 10-n. Note that, although FIG. 3 illustrates the first and second optical space communication devices 1 and 101, the number of optical space communication devices is not limited to this. Note that the first optical space communication device 1 and the second optical space communication device 101 have the same configuration. In the following, the first optical space communication device 1 will be described as an example. Note that these optical space communication devices 1 and 101 can have the same configuration.

[0034] (First optical space communications device 1) 3, the first optical space communications device 1 according to this exemplary embodiment includes a plurality of light transmitting and receiving units 10-1 to 10-n and a communication control unit 20. The plurality of light transmitting and receiving units 10-1 to 10-n and the communication control unit 20 are an example of the light transmitting and receiving means and the communication control means in the claims.

[0035] (Light transmitting / receiving units 10-1 to 10-n) The optical communication medium through which signals are transmitted and received from each of the light transmitting and receiving units 10-1 to 10-n has been described above, and therefore description thereof will be omitted here.

[0036] Each of the light transmitting / receiving units 10-1 to 10-n may employ a known light transmitting / receiving unit that can be used for optical space communication, but in one example, a light transmitting / receiving unit with the configuration shown in FIG. 4 is used. FIG. 4 shows an embodiment in which a transmitting unit 10t that transmits an optical communication medium and a receiving unit 10r that receives the optical communication medium are configured separately. The transmitting unit 10t is configured to receive a signal from an electrical-optical conversion unit 10ta and transmit a laser light (optical communication medium) emitted from a laser light source 10tb to the outside via a collimator lens 10tc. On the other hand, the receiving unit 10r is configured to collect laser light from the outside using a lens 10ra, receive it using a light receiving element 10rb, and convert it into an electrical signal using an electrical-optical conversion unit 10rc.

[0037] (Communication control unit 20) The communication control unit 20 shown in Figure 3 can have the same functions as the communication control unit 20 described in the above exemplary embodiment 1, but below, using Figure 5, we will explain the configuration of the communication control unit 20 provided in the optical space communications device 1 in this exemplary embodiment.

[0038] 5 is a block diagram showing the configuration of the communication control unit 20. The communication control unit 20 includes a determination unit 21, a number control unit 22, and a quality measurement unit .

[0039] The determination unit 21 determines a necessary communication capacity for communication via the multiple light transmitting and receiving units 10-1 to 10-n. The necessary communication capacity and the method of predicting (determining) it have been described in the above exemplary embodiment 1, and therefore will not be described here.

[0040] The number control unit 22 controls the number of light transmitting and receiving units 10-1 to 10-n to be used for communication, based on the necessary communication capacity predicted (determined) by the determination unit 21. The number control unit 22 determines the number of light transmitting and receiving units 10-1 to 10-n to be used for communication, using a table or the like associated with the communication capacity. After determining the number of light transmitting and receiving units 10-1 to 10-n to be used for communication, the number control unit 22 causes the determined light transmitting and receiving units 10-1 to 10-n to be used for communication to transmit and receive information on the optical communication medium.

[0041] For example, the number control unit 22 controls the number of light transmitting and receiving units (number of channels) to be used so that a capacity equal to the estimated required communication capacity plus a margin (fluctuations due to noise, interruption, etc.) can be communicated. The number control unit 22 controls the number of light transmitting and receiving units to be used for communication based on the capacity equal to the required communication capacity plus a margin, thereby making it possible to avoid delays caused by communication exceeding the available communication capacity.

[0042] When the number of light transmitting / receiving units used for communication is less than the total number of light transmitting / receiving units (10-1 to 10-n), the quality measurement unit 23 measures noise or communication quality using the light transmitting / receiving units not used for communication. Examples of communication quality include bit error rate, reception strength, delay, and retransmission rate. The measurement results of noise or communication quality measured by the quality measurement unit 23 can be used to predict required communication capacity. In addition, when the communication quality measured by the quality measurement unit 23 is poor, the results can be used to take measures such as transmitting data via a different communication path to avoid packet loss and data loss.

[0043] The second optical space communications device 101 can employ a device having the same configuration as the first optical space communications device 1. That is, the light transmitting and receiving units 130-1 to 130-n shown in Fig. 4 can employ the same configuration as the light transmitting and receiving units 10-1 to 10-n, and the communication control unit 120 can employ the same configuration as the communication control unit 20. Therefore, detailed description thereof will be omitted.

[0044] (Effects of optical space communication device) The optical space communication devices (first optical space communication device 1 and second optical space communication device 101) according to this exemplary embodiment, and the optical space communication system 400 including these optical space communication devices, are provided with a plurality of light transmitting and receiving units and a communication control unit 20 that controls communication via the plurality of light transmitting and receiving units, and the communication control unit 20 is configured to determine a necessary communication capacity for the communication, and to control the number of light transmitting and receiving units to be used for the communication based on the necessary communication capacity. Therefore, according to this exemplary embodiment, the light transmitting and receiving units not required for communication are not used, thereby achieving the effect of realizing power saving.

[0045] Furthermore, the optical space communications device (first optical space communications device 1 and second optical space communications device 101) according to this exemplary embodiment employs a configuration in which, when the number of light transmitting and receiving units used for communications is less than the total number of light transmitting and receiving units (10-1 to 10-n), noise or communication quality is measured using light transmitting and receiving units not used for communications. Therefore, according to this exemplary embodiment, the light transmitting and receiving units not used for communications can be effectively used. Furthermore, the measurement results can also be used to predict the required communication capacity.

[0046] (Flow of optical space communication method) The flow of the optical free space communication method S1 according to this exemplary embodiment will be described with reference to Fig. 6. Fig. 6 is a flow diagram showing the flow of the optical free space communication method S1 by the optical free space communication system according to this exemplary embodiment.

[0047] As shown in FIG. 6, the optical space communication method S1 includes controlling communication via a plurality of light transmitting and receiving means (communication control step, step S10), and this step S10 includes steps S11, S12, and S13.

[0048] (Step S11) In step S11, the determination unit 21 of the communication control unit 20 determines the communication capacity required for communication. The details of the communication capacity and the determination have been described above, so a description thereof will be omitted here.

[0049] (Step S12) In step S12, the number control unit 22 of the communication control unit 20 determines the number of the light transmitting and receiving units 10-1 to 10-n to be used for communication, and controls the light transmitting and receiving units 10-1 to 10-n to be used to execute the light transmitting and receiving process. The specific process contents here have also been described above, so their explanation will be omitted here.

[0050] (Step S13) In step S13, the quality measurement unit 23 of the communication control unit 20 measures noise or communication quality based on the control result of step S12.

[0051] As described above, the optical space communication method according to this exemplary embodiment includes controlling communication via a plurality of light transmitting and receiving means, and the controlling of the communication includes determining a required communication capacity for the communication and controlling the number of the light transmitting and receiving means used for the communication based on the required communication capacity. According to this exemplary embodiment, the light transmitting and receiving units not required for communication are controlled not to be used, so that it is possible to achieve power saving.

[0052] [Software implementation example] A part or all of the functions of the optical space communications devices 1 and 101 may be realized by hardware such as an integrated circuit (IC chip), or may be realized by software.

[0053] In the latter case, the optical free space communications devices 1, 101 are realized, for example, by a computer that executes instructions of a program, which is software that realizes each function. An example of such a computer (hereinafter, referred to as computer C) is shown in FIG. 7. The computer C includes at least one processor C1 and at least one memory C2. The memory C2 stores a program P for operating the computer C as the optical free space communications devices 1, 101. In the computer C, the processor C1 reads and executes the program P from the memory C2, thereby realizing each function of the optical free space communications devices 1, 101.

[0054] The processor C1 may be, for example, a central processing unit (CPU), a graphic processing unit (GPU), a digital signal processor (DSP), a micro processing unit (MPU), a floating point number processing unit (FPU), a physics processing unit (PPU), a microcontroller, or a combination of these. The memory C2 may be, for example, a flash memory, a hard disk drive (HDD), a solid state drive (SSD), or a combination of these.

[0055] The computer C may further include a RAM (Random Access Memory) for expanding the program P during execution and for temporarily storing various data. The computer C may further include a communication interface for transmitting and receiving data to and from other devices. The computer C may further include an input / output interface for connecting input / output devices such as a keyboard, a mouse, a display, and a printer.

[0056] Furthermore, the program P can be recorded on a non-transitory tangible recording medium M that can be read by the computer C. Such a recording medium M can be, for example, a tape, a disk, a card, a semiconductor memory, or a programmable logic circuit. The computer C can obtain the program P via such a recording medium M. Furthermore, the program P can be transmitted via a transmission medium. Such a transmission medium can be, for example, a communication network or broadcast waves. The computer C can also obtain the program P via such a transmission medium.

[0057] [Additional Note 1] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims. For example, embodiments obtained by appropriately combining the technical means disclosed in the above-described embodiment are also included in the technical scope of the present invention.

[0058] [Additional Note 2] Some or all of the above-described embodiments can be described as follows. However, the present invention is not limited to the following described aspects.

[0059] (Appendix 1) An optical space communications device, A plurality of light transmitting and receiving means; a communication control unit that controls communication via the plurality of light transmitting and receiving units, the communication control means determines a required communication capacity for the communication, and controls the number of the light transmitting and receiving means to be used for the communication based on the required communication capacity. An optical space communications device.

[0060] According to the above-described configuration, since the light transmitting and receiving units that are not necessary for communication are controlled not to be used, it is possible to realize power saving.

[0061] (Appendix 2) the communication control means determines the required communication capacity based on a communication capacity in past communications; 2. The optical space communications device according to claim 1 .

[0062] (Appendix 3) when the number of the light transmitting and receiving means used for the communication is smaller than the total number of the light transmitting and receiving means, the communication control means measures noise or communication quality using the light transmitting and receiving means not used for the communication. 2. The optical space communications device according to claim 1 .

[0063] According to the above-mentioned configuration, the light transmitting and receiving sections not used for communication can be effectively utilized. Also, the measurement results can be used for predicting the required communication capacity.

[0064] (Appendix 4) A plurality of optical space communication devices, At least any of the plurality of optical space communications devices among the plurality of optical space communications devices, The plurality of light transmitting and receiving means; a communication control unit that controls communication via the plurality of light transmitting and receiving units, the communication control means determines a required communication capacity for the communication, and controls the number of the light transmitting and receiving means to be used for the communication based on the required communication capacity. 1. A free space optical communication system.

[0065] According to the above-described configuration, since the light transmitting and receiving units that are not necessary for communication are controlled not to be used, it is possible to realize power saving.

[0066] (Appendix 5) A method for free space optical communication, comprising: controlling communication via a plurality of light transmitting and receiving means; controlling the communication includes determining a required communication capacity for the communication, and controlling the number of the light transmitting and receiving means to be used for the communication based on the required communication capacity. 2. A method for free space optical communication comprising the steps of:

[0067] According to the above-described configuration, since the light transmitting and receiving units that are not necessary for communication are controlled not to be used, it is possible to realize power saving.

[0068] (Appendix 6) A program for operating a computer as the optical space communications device according to any one of claims 1 to 4, the program causing the computer to function as each of the means.

[0069] (Appendix 7) An optical space communications device having at least one processor, The processor, A communication process for performing communication via a plurality of light transmitting and receiving means; A communication control process for controlling the communication is executed; In the communication control process, a required communication capacity for the communication is determined, and the number of the light transmitting and receiving means to be used for the communication is controlled based on the required communication capacity. Optical space communication device.

[0070] The optical space communications device may further include a memory, and the memory may store a program for causing the processor to execute each of the processes. The program may be recorded in a computer-readable, non-transitory, tangible recording medium. [Explanation of symbols]

[0071] 1. First space optical communication device 101 Second optical space communication device 10, 130, 10-1 to 10-n, 130-1 to 130-n Light transmitting and receiving unit (light transmitting and receiving means) 20, 120 Communication control unit (communication control means) 21 Judgment section 22 Number Control Section 23 Quality measurement department 400 Optical Space Communication System

Claims

1. A plurality of transceivers capable of transmitting to and receiving from opposite stations; a control unit that controls spatial multiplexing transmission via the plurality of transceivers; Equipped with the control unit determines a communication capacity for the spatial multiplexing transmission; controlling the number of the transceivers in use based on the determined communication capacity; Communication equipment.

2. The control unit sets a predetermined number of the transceivers to be unused from among the total number of the transceivers when the determined communication capacity is less than the upper limit of communication capacity. The communication device according to claim 1 .

3. The transmitting / receiving unit includes at least one of millimeter waves, submillimeter waves, infrared light, visible light, and ultraviolet light as a communication medium. The communication device according to claim 1 .

4. The transmitting / receiving unit directs and transmits directional electromagnetic waves within a predetermined angular range. The communication device according to claim 1 .

5. The plurality of transceivers include: If all of them have different communication methods, If any two or more of the communication methods are the same and the remaining number is a communication method different from the communication methods, If all units use the same communication method, including one of the following: The communication device according to claim 1 .

6. The plurality of transceivers include: If all of them communicate on different wavelengths, When some of the devices communicate on the same wavelength and the remaining devices communicate on a different wavelength, and If all of them communicate on the same wavelength, including one of the following: The communication device according to claim 1 .

7. The control unit predicts the communication capacity for the spatial multiplexing transmission based on a past communication log for the same time period. The communication device according to claim 1 .

8. The control unit adds a fluctuation component including noise or interruption to the predicted communication capacity for the spatial multiplexing transmission to avoid delays caused by excessive communication capacity. The communication device according to claim 1 .

9. A monitor unit for monitoring noise or communication quality, the monitor unit uses the transceiver unit that is not included in the number of units in use; The communication device according to claim 1 .

10. In spatial multiplexing transmission via multiple transmitters and receivers, determining a communication capacity for the spatial multiplexing transmission; controlling the number of the transceivers in use based on the determined communication capacity; Communication method.

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