JPWO2020158103A1 - Active antenna controller, its control method, and communication control program - Google Patents

Abstract

According to one embodiment, the active antenna control device (1) is a plurality of transceivers (1) configured to be capable of transmitting a plurality of directional radio signals via a plurality of antenna elements (A_1 to A_M). 11_1 to 11_M), the current position acquisition unit (12) that acquires the current position of the first mobile terminal selected as the estimation target of the future position among the plurality of mobile terminals, and the past of the first mobile terminal. The past position acquisition unit (13) for acquiring the position, the future position estimation unit (14) for estimating the future position of the first mobile terminal from the current position and the past position of the first mobile terminal, and the first mobile body. Assuming that any of a plurality of radio signals is emitted toward the future position of the terminal, the first is when the degree of deterioration of the communication quality of the other mobile terminals other than the first mobile terminal is within the permissible range. (1) A control unit (15) for radiating a radio signal toward a future position of the mobile terminal is provided.

Description

The present invention improves, for example, communication quality (modulation accuracy (EVM) and signal-to-noise ratio (SNR)) with respect to an active antenna control device, a control method thereof, and a communication control program. The present invention relates to an active antenna control device suitable for the above, a control method thereof, and a communication control program.

With the increase in traffic demand for mobile terminals such as mobile phones, new communication methods such as the 5th generation mobile access method (5G) are required to expand the transmission capacity of the network.

However, in the communication method using the beamforming technology based on the direction adjustment by analog phase variation, interference fringes are generated due to the interference between the reflected waves from the building and the ground and the multipath radio waves. Therefore, it became clear in the simulation that it is difficult to maintain the quality of the propagation path (channel) that is stable with respect to the movement of the mobile terminal. This problem is particularly remarkable in the quasi-millimeter wave and millimeter wave bands with short wavelengths.

FIG. 10 is a schematic view showing an example of wireless communication using a beamforming technique based on direction adjustment by analog phase variation. Further, FIG. 11 is a diagram showing a result of simulating the relationship between the position of the mobile terminal and the modulation accuracy (EVM; Error Vector Magnitude) under the environment shown in FIG. In the example of FIG. 10, wireless communication in the 28 GHz band is performed in a street where the distance between the buildings sandwiched between the two buildings is 20 m. As shown in FIG. 11, in the wireless communication of FIG. 10, the modulation accuracy is greatly deteriorated only by moving the mobile terminal by several tens of centimeters.

On the other hand, there is a communication method using Massive-MIMO (Multiple Input Multiple Output) transmission technology of the digital domain. In this communication method, it has been mathematically predicted that the change in the quality of the propagation path due to the movement of the mobile terminal will be slow due to the diversity effect using multipath (see Non-Patent Document 1).

FIG. 12 is a schematic diagram showing an example of wireless communication using the Massive-MIMO transmission technology of the digital domain. Further, FIG. 13 is a diagram showing a result of simulating the relationship between the position of the mobile terminal and the modulation accuracy in the environment shown in FIG. In the example of FIG. 12, wireless communication in the 28 GHz band is performed in a street where the distance between the buildings sandwiched between the two buildings is 20 m. As shown in FIG. 13, in the wireless communication of FIG. 12, even if the mobile terminal moves by several tens of centimeters, the deterioration of the modulation accuracy is relatively small.

Further, in the time-division multiplex wireless communication system, the propagation path (propagation matrix) between the base station device and the mobile terminal is set based on the uplink pilot signal by utilizing the reciprocity of the uplink and downlink propagation paths. A measuring method has been studied and developed (see Non-Patent Document 2).

Furthermore, using this measured propagation matrix, beamforming techniques such as maximizing the signal strength in the terminal direction and increasing the signal purity (signal-to-noise ratio (SNR)), and the phase between the antenna elements are used. And techniques for weighting the amplitude have been developed. These techniques can improve the frequency utilization efficiency in the communication method using the Massive-MIMO technology of the digital domain (see Non-Patent Document 3).

In addition, Patent Document 1 describes antenna control in a radio base station provided with a plurality of antenna elements, which enables beam tracking to a large number of mobile terminals moving at high speed by grasping the current position of the mobile terminal with high accuracy. The device is disclosed.

Japanese Unexamined Patent Publication No. 2006-217228

E. Bjornson, "Six Differences between MU-MIMO and Massive MIMO", [online], [Search January 25, 2019] <URL: https://ma-mimo.ellintech.se/2017/10/17 / six-differences-between-mu-mimo-and-massive-mimo /> Hou Xiaolin 2 outside, "Channel estimation by extended 2D DFT interpolation corresponding to high-speed moving environment", [online], [Search on January 25, 2019] <URL: https://www.nttdocomo.co .jp / binary / pdf / corporate / technology / rd / technical_journal / bn / vol16_4 / vol16_4_020jp.pdf> Dhruv Malik, et al., "Comparison of various detection algorithms in a MIMO wireless communication receiver", [online], [Search January 25, 2019] <URL: https://core.ac.uk/download/ pdf / 25799561.pdf> N. Tawa, et al., "28 GHz Downlink Multi-User MIMO Experimental Verification using 360 Element Digital AAS for 5G Massive MIMO", European Microwave Conference, Oct. 2018. "Millimeter Wave Beamforming: Antenna Array Design Selection and Characteristics", [online], [Searched January 25, 2019] <URL: https://seminars.rohde-schwarz.co.jp/download/jp/ an / 1MA276_0e_Beamform_mmW_AntArr-JA.pdf>

However, in the related technology, it takes a finite amount of time to measure the propagation matrix and calculate the weighting of the phase and amplitude between the antenna elements. Therefore, when the mobile terminal is moving, the position of the mobile terminal at the time when wireless communication is started for the measurement of the propagation matrix and the position of the mobile terminal at the time when the measurement of the propagation matrix is completed are different. It will be different. That is, there is no mobile terminal at the end of the measured propagation path. Therefore, there is a problem that high-quality wireless communication cannot be performed with the related technology.

An object of the present disclosure is to provide an active antenna control device, a control method thereof, and a communication control program that solve the above-mentioned problems.

According to one embodiment, the active antenna controller includes a plurality of transceivers configured to be capable of transmitting a plurality of directional radio signals via a plurality of antenna elements, and a plurality of mobile terminals. A current position acquisition unit that acquires the current position of the first mobile terminal selected as a future position estimation target, a past position acquisition unit that acquires the past position of the first mobile terminal, and the first mobile body. A future position estimation unit that estimates the future position of the first mobile terminal after a lapse of a predetermined time from the current position and the past position of the terminal, and the plurality of radios toward the future position of the first mobile terminal. Assuming that any of the signals is emitted, if the degree of deterioration of the communication quality of the other mobile terminals other than the first mobile terminal is within the permissible range, the future position of the first mobile terminal is reached. A control unit for radiating the radio signal toward the user is provided.

Further, according to another embodiment, the control method of the active antenna control device includes a step of transmitting a plurality of directional radio signals from a plurality of transceivers via a plurality of antenna elements, and a plurality of steps. A step of acquiring the current position of the first mobile terminal selected as an estimation target of the future position of the mobile terminals, a step of acquiring the past position of the first mobile terminal, and the first mobile terminal. A step of estimating the future position of the first mobile terminal after a lapse of a predetermined time from the current position and the past position of the above, and one of the plurality of radio signals toward the future position of the first mobile terminal. When the degree of deterioration of the communication quality of the mobile terminals other than the first mobile terminal is within the permissible range, the radio is directed toward the future position of the first mobile terminal. It comprises a step of radiating a signal.

Further, according to another embodiment, the communication control program performs a process of transmitting a plurality of directional radio signals from a plurality of transceivers via a plurality of antenna elements, and a plurality of mobile terminals. Among them, the process of acquiring the current position of the first mobile terminal selected as the estimation target of the future position, the process of acquiring the past position of the first mobile terminal, the current position of the first mobile terminal, and the process. It is said that the process of estimating the future position of the first mobile terminal after a lapse of a predetermined time from the past position and the emission of any of the plurality of radio signals toward the future position of the first mobile terminal. Assuming that, when the degree of deterioration of the communication quality of the mobile terminal other than the first mobile terminal is within the permissible range, the radio signal is emitted toward the future position of the first mobile terminal. Let the computer perform the processing.

According to the above-described embodiment, it is possible to provide an active antenna control device capable of improving communication quality, a control method thereof, and a communication control program.

It is a block diagram which shows the structural example of the active antenna control apparatus which concerns on Embodiment 1. FIG. It is a flowchart which shows the operation of the active antenna control device which concerns on Embodiment 1. FIG. It is a figure which shows the past and present positional relationship of a mobile terminal with respect to a base station apparatus. It is a figure which shows the past, present and future positional relationship of a mobile terminal with respect to a base station apparatus. The result of simulating the relationship between the position of the mobile terminal at the present time and the future time and the modulation accuracy when the number of transceivers provided in the active antenna control device according to the first embodiment is eight is shown. It is a figure. The result of simulating the relationship between the position of the mobile terminal at the present time and the future time and the modulation accuracy when the number of transceivers provided in the active antenna control device according to the first embodiment is 16. It is a figure. The result of simulating the relationship between the position of the mobile terminal at the present time and the future time and the modulation accuracy when the number of transceivers provided in the active antenna control device according to the first embodiment is 32 is shown. It is a figure. It is a flowchart which shows other operation of the active antenna control apparatus which concerns on Embodiment 1. FIG. It is a block diagram which shows an example of the hardware composition of the communication control processor. It is a schematic diagram which shows the example of the wireless communication using the beamforming technology which is based on the direction adjustment by analog phase variable. It is a figure which shows the result of simulating the relationship between the position of a mobile terminal under the environment shown in FIG. 10 and the modulation accuracy. It is the schematic which shows the example of the wireless communication using the Massive-MIMO technology of the digital domain. It is a figure which shows the result of simulating the relationship between the position of a mobile terminal under the environment shown in FIG. 12 and the modulation accuracy.

Hereinafter, embodiments will be described with reference to the drawings. Since the drawings are simple, the technical scope of the embodiment should not be narrowly interpreted based on the description of the drawings. Further, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

In the following embodiments, when it is necessary for convenience, the description will be divided into a plurality of sections or embodiments. However, unless otherwise specified, they are not unrelated to each other, and one has a relationship of a part or all of the other, a modified example, an application example, a detailed explanation, a supplementary explanation, and the like. In addition, in the following embodiments, when the number of elements (including the number, numerical value, quantity, range, etc.) is referred to, when it is specified in particular, or when it is clearly limited to a specific number in principle, etc. Except, the number is not limited to the specific number, and may be more than or less than the specific number.

Furthermore, in the following embodiments, the components (including operation steps and the like) are not necessarily essential unless otherwise specified or clearly considered to be essential in principle. Similarly, in the following embodiments, when referring to the shape, positional relationship, etc. of a component or the like, the shape is substantially the same unless otherwise specified or when it is considered that it is not apparent in principle. Etc., etc. shall be included. This also applies to the above numbers (including the number, numerical value, quantity, range, etc.).

<Embodiment 1>
FIG. 1 is a block diagram showing a configuration example of the active antenna control device 1 according to the first embodiment. The active antenna control device 1 is mounted on, for example, a base station device (BS; Base Station), and is configured to enable wireless communication at the same time as a plurality of mobile terminals (UE; User Equipment) 2_1 to 2_K (K is an integer of 2 or more). Has been done.

Specifically, the active antenna control device 1 includes M transceivers 11_1 to 11_M provided corresponding to M (M is an integer of 2 or more) antenna elements A_1 to A_M, and a cross-linking multiplication unit 20. , Equipped with. The cross-linking multiplication unit 20 is provided so as to cross-connect L (L is an integer of 2 or more) transmission data input units 16_1 to 16_L for each user and M transceivers 11_1 to 11_M to each other. It has × M multipliers 17_1 to 17_L × M. Further, the active antenna control device 1 further includes a current position acquisition unit 12, a past position acquisition unit 13, a future position estimation unit 14, and a control unit 15.

The transceivers 11_1 to 11_M respectively radiate a directional radio signal (beam) into the air via the antenna elements A_1 to A_M, or emit a radio signal from a mobile terminal to the antenna elements A_1 to A_M. Receive wirelessly via.

Specifically, each transceiver 11_1 to 11_M has a DA converter, an AD converter, and a frequency converter according to a required radio frequency. Each multiplier 17_1 to 17_L × M provided in the multiplication unit 20 has a digital signal according to a pre-calculated beamforming weighting (phase and amplitude weighting) and a digital radio signal at the time of wireless transmission. And, multiply. That is, the radio signal is given directivity. The DA converter then converts the multiplied digital radio signal into an analog signal. This analog radio signal is radiated toward the mobile terminal to be communicated via the antenna element. Further, at the time of wireless reception, the AD converter converts the wireless signal (analog signal) wirelessly received via the antenna element into a digital signal. Then, the digital radio signal is multiplied by the pre-calculated digital signal according to the weight for beamforming. As a result, the directional component is removed from the radio signal transmitted from the mobile terminal. With such a configuration, the active antenna control device 1 can simultaneously form a plurality of beams directed at each of the plurality of mobile terminals by using a plurality of transceivers (Non-Patent Documents 4 and 5). reference).

Here, for the active antenna control device 1, for example, Massive-MIMO transmission technology of a digital domain that performs wireless communication via many tens to hundreds of antenna elements A_1 to A_M is adopted. As a result, the change in the quality of the propagation path due to the movement of the mobile terminal becomes gradual due to the diversity effect using multipath. For example, in the case of an analog single beam, the SNR and EVM of the propagation path change most steeply as the mobile terminal moves perpendicularly to the interference fringes. In this case, by adding a beam parallel to the interference fringes (that is, a beam orthogonal to the moving direction of the mobile terminal), it is possible to mitigate the change in the quality of the propagation path.

In this example, the relationship between the number M of the antenna elements A_1 to A_M, the number K of the mobile terminals 2_1 to 2_K, and the number K'of the mobile terminals whose future position is estimated, which will be described later, is approximately M. It is configured to satisfy ≧ (K + K') × 4.

Further, in the present embodiment, in the time division multiplexing wireless communication system, the reciprocity of the uplink and downlink propagation paths is utilized, and the base station device and the mobile terminal are connected based on the uplink pilot signal. A method of measuring the propagation path (propagation matrix) between them is adopted.

Further, in the present embodiment, the measured propagation matrix is used to perform beamforming techniques such as maximizing the signal strength and increasing the signal purity in the terminal direction, and the phase and amplitude between the antenna elements. The technique of weighting is adopted. Thereby, the frequency utilization efficiency in the communication method using the Massive-MIMO technology of the digital domain can be improved.

The current position acquisition unit 12 propagates the current position information of the mobile terminal 2_i (i is any of 1 to K) selected as the estimation target of the future position among the mobile terminals 2_1 to 2_K, for example, the current position. Obtained from road information. The past position acquisition unit 13 acquires the past position information of the mobile terminal 2_i from, for example, the past propagation path information. As a method for measuring the propagation path, for example, there are methods such as maximum ratio synthesis and zero forcing.

The future position estimation unit 14 determines a predetermined time from the current position information of the mobile terminal 2_i acquired by the current position acquisition unit 12 and the past position information of the mobile terminal 2_i acquired by the past position acquisition unit 13. Estimate the future position of the mobile terminal 2_i after the lapse of.

The control unit 15 measures the communication quality (at least one of SNR and EVM) of the mobile terminal other than the mobile terminal 2_i, assuming that the radio signal is emitted toward the future position of the mobile terminal 2_i. do. Then, when the degree of deterioration of the communication quality of the mobile terminal other than the mobile terminal 2_i is within the permissible range, the control unit 15 radiates the radio signal toward the future position of the mobile terminal 2_i.

In this way, the active antenna control device 1 more accurately measures the propagation path between the base station device and the mobile terminal 2_i by estimating the future position from the past and present position information of the mobile terminal 2_i. can do. Thereby, the communication quality between the base station apparatus and the mobile terminal 2_i can be improved. Here, assuming that the active antenna control device 1 radiates a radio signal toward the future position of the mobile terminal 2_i, the deterioration of the communication quality of the mobile terminals other than the mobile terminal 2_i is within the permissible range. Only when is, the radio signal is emitted toward the future position of the mobile terminal 2_i. As a result, deterioration of communication quality of mobile terminals other than mobile terminal 2_i is also suppressed.

Subsequently, the operation of the active antenna control device 1 mounted on the base station device will be described with reference to FIGS. 2, 3 and 4. FIG. 2 is a flowchart showing the operation of the active antenna control device 1. FIG. 3 is a diagram showing the past and present positional relationships of the mobile terminal with respect to the base station device. FIG. 4 is a diagram showing the past, present, and future positional relationships of the mobile terminal with respect to the base station device.

Here, an example is taken in the case where wireless communication is simultaneously performed between the base station device 10 and the three mobile terminals 2_1 to 2_3, and the mobile terminal 2_2 is selected as the estimation target of the future position. explain.

First, the control unit 15 measures the respective propagation paths between the base station device 10 and the mobile terminals 2_1 to 2_3 by utilizing the reciprocity of the propagation paths (step S101).

After that, the current position acquisition unit 12 acquires the current position information (time t11) of the mobile terminal 2_2 selected as the estimation target of the future position, and the past position acquisition unit 13 acquires the past position of the mobile terminal 2_2. The position information (time t10 <t11) is acquired (step S102).

After that, the future position estimation unit 14 estimates the future position information of the mobile terminal 2_2 (time t12> t11) from the current position information and the past position information of the mobile terminal 2_2 (step S103).

After that, the control unit 15 measures the propagation path between the base station device 10 and the future position of the mobile terminal 2_2 (step S104). Specifically, for example, the calculation of the amplitude and phase weighting of the radio signal so as to have directivity in the direction of the future position of the mobile terminal 2_2 is performed. Hereinafter, the mobile terminal 2_2 at the future position will also be referred to as a mobile terminal 2_2'for convenience.

Here, assuming that the control unit 15 radiates a radio signal toward the future position of the mobile terminal 2_2, the communication qualities (SNR and SNR and) of the other mobile terminals 2_1, 2_3 other than the mobile terminal 2_2 are assumed. At least one of the EVMs) is measured (step S105). Then, the control unit 15 determines whether or not the degree of deterioration of the communication quality of the mobile terminals 2_1 and 2_3 is within the permissible range (step S106). The permissible range is defined by, for example, a preset threshold value.

For example, when the degree of deterioration of the communication quality of the mobile terminals 2_1 and 2_3 is within the permissible range (YES in step S106), the control unit 15 faces the mobile terminal 2_2'(future position of the mobile terminal 2_2). The radio signal is radiated (step S107).

On the other hand, when the degree of deterioration of the communication quality of the mobile terminals 2_1 and 2_3 is out of the permissible range (NO in step S106), the control unit 15 does not radiate the radio signal toward the mobile terminal 2_2'(step S108). ).

In this way, the active antenna control device 1 estimates the future position from the past and present position information of the mobile terminal 2_2. Then, assuming that the active antenna control device 1 radiates a radio signal toward the future position of the mobile terminal 2_2, the deterioration of the communication quality of the mobile terminals other than the mobile terminal 2_2 is within the permissible range. Only in certain cases will the radio signal be emitted towards the future position of the mobile terminal 2_2. As a result, deterioration of communication quality of other mobile terminals other than the mobile terminal 2_2 is also suppressed. As a result, for example, wideband transmission using a high SHF (Super High Frequency) band such as quasi-millimeter wave or millimeter wave and stability of the propagation path during high-speed movement of the mobile terminal are optimized. The heading of points or both can be made compatible.

In the antenna control device of Patent Document 1, the beam tracking to the mobile terminal moving at high speed is performed by grasping the current position of the mobile terminal with high accuracy, but the beam tracking to the mobile terminal moving at high speed is performed. No consideration is given to the deterioration of communication quality of other mobile terminals due to this. Therefore, the communication quality of other mobile terminals may deteriorate due to the interference generated by radiating the beam including the future position of the mobile terminal moving at high speed. On the other hand, the active antenna control device 1 according to the present embodiment takes measures to solve such a problem.

(simulation result)
Subsequently, with reference to FIGS. 5, 6 and 7, the influence of the number of transceivers provided in the active antenna control device 1 on the amount of change in EVM that changes with the movement of the mobile terminal will be described.

FIGS. 5, 6 and 7 show the results of simulating the relationship between the position of the mobile terminal at the current time and the future time and the EVM when the number M of the transceivers M is M = 8, 16 and 32, respectively. It is a figure which shows.

Here, an example is taken in the case where wireless communication is simultaneously performed between the base station device 10 and the two mobile terminals 2_1 and 2, and the mobile terminal 2_1 is selected as the estimation target of the future position. explain.

As shown in FIG. 5, when the number of transceivers M is 8, the EVM of the mobile terminal 2_1 at the current position is -21 dB, whereas the EVM of the mobile terminal 2_1 at the future position is also referred to as the mobile terminal 2_1 (mobile terminal 2_1'). ) EVM has deteriorated to -18 dB. Further, as shown in FIG. 6, when the number of transceivers M is 16, the EVM of the mobile terminal 2_1 at the current position is -25 dB, whereas the EVM of the mobile terminal 2_1 at the future position is -25 dB. Is maintained. Further, as shown in FIG. 7, when the number of transceivers M is 32, the EVM of the mobile terminal 2_1 at the current position is -25 dB, whereas the EVM of the mobile terminal 2_1 at the future position is -25 dB. Is maintained. From these simulation results, the degree of deterioration of EVM is suppressed when M ≧ (K + K') × 4 is satisfied, such as when M = 16 or 32, K = 2, K'= 1. I understand.

(Other operations of active antenna controller 1)
Subsequently, other operations of the active antenna control device 1 will be described with reference to FIG. FIG. 8 is a flowchart showing another operation of the active antenna control device 1. Here, the case where wireless communication is simultaneously performed between the base station device 10 and the three mobile terminals 2_1 to 2_3, and the mobile terminal 2_2 is first selected as the future position estimation target. Let's take an example. Further, here, a part different from the content shown in FIG. 2 will be mainly described.

In this example, when the degree of deterioration of the communication quality of the mobile terminals 2_1 and 2_3 is out of the permissible range (NO in step S106), the control unit 15 sets the estimated value of the moving distance of the mobile terminal 2_2 and the mobile terminal 2_2'. Adjust any of the strengths of the virtually transmitted radio signals (step S109).

Specifically, for example, the estimated value of the moving distance of the mobile terminal 2_2 is shortened. Instead of shortening the estimated value of the moving distance of the mobile terminal 2_2, the estimated value of the elapsed time from the current time to the future time may be shortened. Alternatively, for example, the signal strength of the radio signal virtually transmitted toward the future position of the mobile terminal 2_2 is weakened. As a result, there is a high possibility that the degree of deterioration of SNR and EVM accompanying the movement of the mobile terminal 2_2 from the current position to the future position is suppressed.

After that, the control unit 15 again measures the communication quality of each of the mobile terminals 2_1, 2_3 other than the mobile terminal 2_2, assuming that the radio signal is emitted toward the future position of the mobile terminal 2_2. (Step S105). Then, the control unit 15 determines whether or not the degree of deterioration of the communication quality of the mobile terminals 2_1 and 2_3 is within the permissible range (step S106). Such an operation is repeated until the degree of deterioration of the communication quality of the mobile terminals 2_1, 2_3 is within the permissible range.

Then, when the degree of deterioration of the communication quality of the mobile terminals 2_1 and 2_3 is within the permissible range (YES in step S106), the control unit 15 directs the radio signal of the set intensity toward the future position of the mobile terminal 2_2. Is radiated (step S107).

The control unit 15 may be configured to perform regression calculation using a predetermined function for a moving distance such that the degree of deterioration of the communication quality of the mobile terminals 2_1, 2_3 is within an allowable range. Alternatively, the control unit 15 may be configured to perform regression calculation using a predetermined function for a radio signal having a strength such that the degree of deterioration of the communication quality of the mobile terminals 2_1, 2_3 is within an allowable range. Examples of the regression calculation method include linear, least squares, and polynomials.

After that, if all the mobile terminals are not selected as the future position estimation target (NO in step S110), another mobile terminal that has not yet been selected as the future position estimation target is selected as the future position estimation target. (Step S111). After that, the process returns to the process of step S102. Then, when all the mobile terminals are selected as the estimation targets of the future position (YES in step S110), the process ends.

Since the contents of the flowchart shown in FIG. 8 are the same as those of the flowchart shown in FIG. 2, the description thereof will be omitted.

(Hardware configuration of communication control function of active antenna control device 1)
The communication control process realized by all or part of the current position acquisition unit 12, the past position acquisition unit 13, the future position estimation unit 14, and the control unit 15 provided in the active antenna control device 1 is a general-purpose computer. It can be realized by the system. Hereinafter, a brief description will be given with reference to FIG.

FIG. 9 is a block diagram showing an example of the hardware configuration of the communication control function of the active antenna control device 1. The computer 100 includes, for example, a CPU (Central Processing Unit) 101, which is a control device, a RAM (Random Access Memory) 102, and a ROM (Read Only Memory) 103. The computer 100 further includes an IF (Inter Face) 104, which is an interface with the outside, and an HDD (Hard Disk Drive) 105, which is an example of a non-volatile storage device. Further, the computer 100 may be provided with an input device such as a keyboard and a mouse and a display device such as a display as other configurations (not shown).

The HDD 105 stores an OS (Operating System) (not shown) and a communication control processing program 106. The communication control processing program 106 is a computer program in which the communication control processing according to the present embodiment is implemented.

The CPU 101 controls various processes in the computer 100, access to the RAM 102, ROM 103, IF 104, HDD 105, and the like. The computer 100 reads and executes the OS and the communication control processing program 106 stored in the HDD 105 by the CPU 101. As a result, the computer 100 realizes the communication control function of the active antenna control device 1 according to the present embodiment.

Although the invention made by the present inventor has been specifically described above based on the embodiments, the present invention is not limited to the embodiments already described, and various changes can be made without departing from the gist thereof. It goes without saying that it is possible.

In the above-described embodiment, the present invention has been described as a hardware configuration, but the present invention is not limited thereto. The present invention can also be realized by causing a CPU (Central Processing Unit) to execute a computer program. In addition, the programs described above can be stored and supplied to a computer using various types of non-transitory computer readable media. Non-transient computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROMs (Read Only Memory) CD-Rs, CDs. -R / W, including semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)). The program may also be supplied to the computer by various types of temporary computer readable media. Examples of temporary computer-readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

Although the invention of the present application has been described above with reference to the embodiments, the invention of the present application is not limited to the above. Various changes that can be understood by those skilled in the art can be made within the scope of the invention in the configuration and details of the invention of the present application.

This application claims priority on the basis of Japanese application Japanese Patent Application No. 2019-015923 filed on January 31, 2019, and incorporates all of its disclosures herein.

1 Active antenna control device 2_1 to 2_K Mobile terminal 10 Base station device 11_1 to 11_M Transceiver 12 Current position acquisition unit 13 Past position acquisition unit 14 Future position estimation unit 15 Control unit 16_1 to 16_L Transmission data input unit for each user 17_1 to 17_L × M Multiplier 20 Multiply Multiplier 100 Computer 100
101 CPU
102 RAM
103 ROM
104 IF
105 HDD
106 Communication control processing program A_1 to A_M Antenna element

Claims (10)

A plurality of transceivers configured to be able to transmit a plurality of directional radio signals via a plurality of antenna elements, and a plurality of transceivers.
A current position acquisition means for acquiring the current position of the first mobile terminal selected as a future position estimation target among a plurality of mobile terminals, and a current position acquisition means.
The past position acquisition means for acquiring the past position of the first mobile terminal, and
A future position estimating means for estimating the future position of the first mobile terminal after a lapse of a predetermined time from the current position and the past position of the first mobile terminal.
Assuming that any of the plurality of radio signals is radiated toward the future position of the first mobile terminal, the degree of deterioration of the communication quality of the other mobile terminals other than the first mobile terminal is within the permissible range. When the inside is inside, the control means for radiating the radio signal toward the future position of the first mobile terminal, and
Active antenna controller with. When the degree of deterioration of the communication quality of the other mobile terminal is out of the permissible range, the control means re-estimates the moving distance from the current position to the future position of the first mobile terminal and then re-estimates it. Assuming that the radio signal is radiated toward the future position of the first mobile terminal, it is determined again whether or not the degree of deterioration of the communication quality of the other mobile terminal is within the permissible range. It is configured,
The active antenna control device according to claim 1. The control means is configured to calculate the moving distance using a predetermined function so that the degree of deterioration of the communication quality of the other mobile terminal is within an allowable range.
The active antenna control device according to claim 2. When the degree of deterioration of the communication quality of the other mobile terminal is out of the permissible range, the control means re-estimates the elapsed time from the current time to the future time, and then re-estimates the elapsed time of the first mobile terminal. Assuming that the radio signal is emitted toward a future position, it is configured to redetermine whether or not the degree of deterioration of the communication quality of the other mobile terminal is within the permissible range.
The active antenna control device according to claim 1. The control means is configured to calculate the elapsed time using a predetermined function so that the degree of deterioration of the communication quality of the other mobile terminal is within an allowable range.
The active antenna control device according to claim 4. When the degree of deterioration of the communication quality of the other mobile terminal is out of the permissible range, the control means further enhances the strength of the radio signal virtually radiated toward the future position of the first mobile terminal. Is configured to adjust,
The active antenna control device according to any one of claims 2 to 5. Let K be the number of the plurality of mobile terminals, K'be the number of mobile terminals whose future position is estimated as the first mobile terminal among the plurality of mobile terminals, and M be the number of the plurality of transceivers. ,
M> (K + K') x 4
Is configured to hold,
The active antenna control device according to any one of claims 1 to 6. The control means is configured so as not to radiate the radio signal toward the future position of the first mobile terminal when the degree of deterioration of the communication quality of the other mobile terminal is maintained outside the permissible range. ,
The active antenna control device according to any one of claims 1 to 7. A step of transmitting a plurality of directional radio signals from a plurality of transceivers via a plurality of antenna elements,
A step of acquiring the current position of the first mobile terminal selected as an estimation target of the future position among a plurality of mobile terminals, and
The step of acquiring the past position of the first mobile terminal and
A step of estimating the future position of the first mobile terminal after a lapse of a predetermined time from the current position and the past position of the first mobile terminal, and
Assuming that any of the plurality of radio signals is radiated toward the future position of the first mobile terminal, the degree of deterioration of the communication quality of the other mobile terminals other than the first mobile terminal is within the permissible range. In the case of, the step of radiating the radio signal toward the future position of the first mobile terminal, and
A control method for an active antenna controller. Processing to transmit multiple radio signals with directivity through multiple antenna elements from multiple transceivers,
The process of acquiring the current position of the first mobile terminal selected as the target for estimating the future position among a plurality of mobile terminals, and
The process of acquiring the past position of the first mobile terminal and
A process of estimating the future position of the first mobile terminal after a lapse of a predetermined time from the current position and the past position of the first mobile terminal, and
Assuming that any of the plurality of radio signals is radiated toward the future position of the first mobile terminal, the degree of deterioration of the communication quality of the other mobile terminals other than the first mobile terminal is within the permissible range. In the case of being inside, the process of radiating the radio signal toward the future position of the first mobile terminal, and
A non-transitory computer-readable medium containing a program that causes a computer to execute.

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