JP2023182503A - Radio control device, radio communication system, radio control method, and radio control program - Google Patents

Abstract

To provide a radio control device, a radio communication system, a radio control method, and a radio control program that can achieve stable communication quality.SOLUTION: A radio control device 20a includes: a movement prediction unit 22a that predicts movement of a radio terminal 200 that performs radio communication; a propagation change determination unit 24a that determines a propagation change degree indicating the degree to which the propagation of the radio communication including the received power of the radio communication changes within a predetermined expected delay time; and a selection unit 25a that selects at least one of an antenna and a beam used for radio communication control with the radio terminal 200 from among a plurality of antennas and a plurality of beams based on the propagation change degree determined by the propagation change determination unit 24a.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a wireless control device, a wireless communication system, a wireless control method, a wireless control program, and a storage medium storing the program. For example, the present disclosure relates to a radio base station apparatus and a radio communication system, and particularly relates to an antenna and beam control method in a high frequency band distributed antenna type (distributed MIMO: Multiple-Input and Multiple-Output) radio base station apparatus.

In order to increase the capacity of mobile communication systems such as cellular systems, the importance of wireless communication using high frequency bands such as millimeter waves and terahertz waves that can use a wide frequency bandwidth is increasing. When a high frequency band is used for mobile communication, large-capacity communication can be made possible by utilizing a wide frequency band. On the other hand, there are problems in that the propagation loss is large depending on the frequency, and that the influence of shielding objects is large because the radio waves travel in a straight line and are difficult to wrap around.

Beamforming technology is a means to solve the former problem of propagation loss. Beamforming technology is a technology that strengthens the reception level of radio signals transmitted in the direction of a communication target by appropriately controlling the phase of radio signals transmitted from a large number of antenna elements. By using beamforming technology, large propagation losses due to high frequency bands can be compensated for.

As a means to solve the latter problem of straightness, there is a distributed antenna system (DAS). DAS lowers the probability that line-of-sight communication between the antenna and the wireless terminal will be interrupted by extending the antenna of the wireless base station and distributing multiple antennas.

However, if the wireless terminal and the distributed antenna are shielded while the wireless terminal is moving, the received power from the distributed antenna may drop significantly. In that case, the wireless terminal needs to switch to a different beam in a direction that allows it to receive reflected waves instead of direct waves, or switch to transmission from another distributed antenna in a line-of-sight position. However, due to rapid deterioration of received power, a radio link failure may occur, and a connection may need to be established through a reconnection procedure. At this time, there is a time when the wireless terminal cannot perform data communication. On the other hand, it is possible to always transmit the same radio signal from multiple distributed antennas at the same time to prevent this radio link disconnection, but this may limit system throughput due to redundant use of radio resources. .

Special Publication No. 2020-507233 Japanese Patent Application Publication No. 2019-134217

Takashi Seyama, Teppei Oyama, Takashi Dateki, “A study on proactive beamforming control using machine learning in 5G mobile communications”, Institute of Electronics, Information and Communication Engineers, Technical Report SR2018-7, May 2018

In Non-Patent Document 1, a wireless control method technology that applies machine learning technology is studied as a method to avoid disconnecting wireless link connections and to avoid inefficient use of wireless resources due to redundant communication. There is. Non-Patent Document 1 describes an event in which the reception level significantly decreases by machine learning using time-series data of the beam number selected by a wireless terminal and the reception level of a wireless signal from a base station when using that beam. Predict. Since deterioration caused by static shielding objects such as buildings and trees is reproducible, Non-Patent Document 1 can predict such deterioration in reception level. When deterioration of the reception level is predicted, Non-Patent Document 1 maintains the connection by transmitting a backup beam.

Although Non-Patent Document 1 makes it possible to estimate the reception level without explicitly considering obstructing objects, it is possible to make mistakes in beam selection and antenna selection depending on the situation of the wireless terminal. For example, FIG. 1 is a diagram illustrating beam switching to a moving wireless terminal. As shown in FIG. 1, as the wireless terminal 210 moves, it is shielded from the base station antenna 110 in the shielding section 310 by the shielding object 300, so that the reception level is significantly degraded. On the other hand, since the wireless terminal 220 is located in front of the shielding object 300, it is not affected by the shielding object 300 and is not affected by the reception level. However, since learning is performed based on the reception level and beam number in Non-Patent Document 1, the situations of the wireless terminal 210 and the wireless terminal 220 may be confused. For example, depending on the propagation environment, the reception power of wireless terminal 210 and wireless terminal 220 may be about the same, and in that case, it is considered that prediction errors in shielding are likely to occur.

Patent Document 1 discloses that beam selection is performed according to a predicted position using position information of a wireless terminal, and that fixed shielding objects such as trees are detected and beam and antenna selection is performed according to the detection results. A technique for making a selection is disclosed. Patent Document 1 is considered to use position information to enable selection of a beam and antenna that avoids a shielding object according to the position.

However, as in Patent Document 1, location information alone cannot reflect the unique situation of a wireless terminal, and it may be difficult to select the optimal beam and antenna. For example, if beams and antennas are selected based only on predicted positions, the wireless terminal may be unable to communicate or may be disconnected if the prediction is incorrect. Also, selecting multiple beams and antennas based on both current conditions and predicted locations can limit system throughput due to redundant use of radio resources.

Patent Document 2 describes a technology for forming a set of wireless terminals that are estimated to be moving by the same means of transportation (train, etc.) into one wireless terminal group based on position information of the wireless terminals and speed information of the wireless terminals. is disclosed. Further, Patent Document 2 estimates the group position of a group of wireless terminals after a predetermined time, and performs beamforming according to the direction of movement. Further, Patent Document 2 uses the types of user terminals such as smartphones and tablet terminals, and train business terminals as the type information of wireless terminals. Train service terminals include indoor display terminals installed on trains, communication terminals used in train operation operations, machine terminals that control various sensors in trains, and the like.

According to Patent Document 2, the coverage of a base station can be adjusted by using a beam suitable for a position where a group of wireless terminals is predicted to move. On the other hand, if an obstacle is located between a base station and a group of wireless terminals, there is a possibility that the group of wireless terminals will be blocked by the obstacle all at once and the connection will be interrupted.

As described above, Non-Patent Document 1 and Patent Documents 1 and 2 disclose that the predicted position and shielding objects are detected using the position information of the wireless terminal, and the beam and antenna are selected accordingly. has been done. However, it may be difficult to select the optimal beam and antenna using only position information. For example, if a predicted beam is selected alone, there is a possibility that the wireless terminal will be unable to communicate if the prediction is incorrect. Also, selecting multiple beams and antennas based on both current conditions and predicted positions can limit system throughput due to redundant use of radio resources. It is desired to realize stable communication quality.

One of the purposes of the present disclosure is to solve such problems, and to provide a radio control device, a radio communication system, a radio control method, and a radio control program that can realize stable communication quality. It is about providing.

A wireless control device according to an embodiment includes a movement prediction unit that predicts movement of a wireless terminal that performs wireless communication, and a rate at which the propagation of the wireless communication including received power of the wireless communication occurs within a predetermined expected delay time. a propagation change determination unit that determines a degree of propagation change indicating the degree of change; a selection unit that selects at least one of the antenna and the beam used for wireless communication control between the antenna and the beam.

A wireless communication system according to an embodiment includes at least one wireless terminal and a wireless control device that performs wireless communication with the wireless terminal, and the wireless control device includes a movement prediction device that predicts movement of the wireless terminal. a propagation change determination unit that determines a degree of propagation change indicating how much the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time; and the propagation change determination unit a selection unit that selects at least one of the antenna and the beam used for wireless communication control with the wireless terminal from among the plurality of antennas and the plurality of beams based on the propagation change degree determined by; Equipped with

A wireless control method according to an embodiment predicts the movement of a wireless terminal that performs wireless communication, and calculates how much the propagation of the wireless communication including the received power of the wireless communication will change within a predetermined expected delay time. A propagation change degree indicating the degree of change is determined, and based on the determined propagation change degree, one of the antennas and beams used for wireless communication control with the wireless terminal is selected from a plurality of antennas and a plurality of beams. Select at least one.

A wireless control program according to an embodiment and a storage medium storing the program predict the movement of a wireless terminal that performs wireless communication, and include the received power of the wireless communication within a predetermined expected delay time. determining a degree of change in propagation that indicates the degree to which the propagation changes, and controlling wireless communication with the wireless terminal from among a plurality of antennas and a plurality of beams based on the determined degree of change in propagation. causing a computer to select at least one of the antenna and the beam to be used.

According to the present disclosure, it is possible to provide a wireless control device, a wireless communication system, a wireless control method, a wireless control program, and a storage medium storing such a program that can realize stable communication quality.

FIG. 3 is a diagram illustrating beam switching to a moving wireless terminal. FIG. 1 is a block diagram illustrating a radio control device according to an overview of an embodiment. FIG. 2 is a flowchart diagram illustrating a wireless control method according to an overview of the embodiment. 1 is a diagram illustrating a configuration of a wireless communication system according to a first embodiment; FIG. FIG. 2 is a block diagram illustrating a wireless base station device in the wireless communication system according to the first embodiment. FIG. 2 is a block diagram illustrating an antenna beam prediction control section in the radio base station apparatus according to the first embodiment. FIG. 2 is a block diagram illustrating a propagation change determination unit according to the first embodiment. This is a graph illustrating reference delay time information in the propagation change determination unit according to Embodiment 1, which controls the reference interval of received power information, candidate beam selection, communication beam determination, etc., and the determined communication beam. Indicates the timing of communication. 3 is a diagram illustrating a Fresnel zone and a Fresnel radius in the propagation change determination unit according to the first embodiment. FIG. 3 is a graph illustrating changes in propagation (wireless quality) according to Embodiment 1, in which the horizontal axis indicates time and the vertical axis indicates propagation (wireless quality) of wireless communication. 3 is a graph illustrating changes in propagation (wireless quality) according to Embodiment 1, in which the horizontal axis indicates time and the vertical axis indicates propagation (wireless quality) of wireless communication. FIG. 3 is a diagram illustrating received power of a current beam and a selected beam according to the first embodiment. FIG. 3 is a diagram illustrating received power of a current beam and a selected beam according to the first embodiment. FIG. 3 is a diagram illustrating received power of a current beam and a selected beam according to the first embodiment. FIG. 3 is a flowchart illustrating a predictive control method in the antenna beam predictive control unit according to the first embodiment. FIG. 2 is a flowchart illustrating a predictive control method in a propagation change determination unit and a selection unit according to the first embodiment. FIG. 2 is a block diagram illustrating a case where the radio control device according to the first and second embodiments is implemented by an information processing device.

Hereinafter, embodiments will be described with reference to the drawings. For clarity of explanation, the following description and drawings are omitted and simplified as appropriate. Further, in each drawing, the same elements are denoted by the same reference numerals, and redundant explanation will be omitted as necessary.

(Summary of embodiment)
First, a wireless control device according to an overview of the embodiment will be described. Note that the radio control device includes several devices described below, such as a radio base station device. The present embodiment has been made in order to solve the above-mentioned problems, and for example, the purpose is to provide a radio base station device, a radio communication system, etc. that achieve stable communication quality with the minimum necessary radio resources. . In order to solve such problems, this embodiment has the following features.

The radio base station device predicts the position to which the radio terminal will move after an assumed delay time and estimates the moving speed of the radio terminal. In addition, the radio base station device estimates the reception level of the radio signal for each antenna and each beam at the predicted position, and uses the moving speed to estimate how much the propagation of radio communication will change within the expected delay time. The degree of change in propagation is calculated. Then, the radio base station device also uses the degree of propagation variation to determine at least one of an antenna and a beam to be used for radio communication with the radio terminal.

With the above means, the radio base station apparatus has, for example, the following effects. That is, the radio base station device of this embodiment calculates the degree of propagation change, determines the necessity of selective control of antennas and beams at the predicted position based on the degree of propagation change, and then selects the antenna and beam used for wireless communication. Make beam selection. Thereby, the radio base station apparatus can realize stable communication quality with the minimum necessary radio resources.

Also, selecting multiple beams and antennas based on both current conditions and predicted positions can limit system throughput due to redundant use of radio resources. Therefore, the radio base station device of this embodiment calculates how much the propagation changes within the assumed delay time.

If the degree of propagation change is large and shielding occurs due to movement, there is a concern that communication quality will deteriorate significantly. Therefore, the radio base station device predicts the movement of the radio terminal and performs selection control of at least one of an antenna and a beam based on the predicted position.

If the degree of propagation change is small, there is no concern about significant deterioration in communication quality even if shielded. Therefore, in the radio base station device, selection control of antennas and beams based on predicted positions is not necessary, and selection control of antennas and beams is performed based on information on received power currently being communicated.

The propagation change degree is calculated from the relationship between the expected delay time (control delay) and the radio quality fluctuation time. Here, the wireless quality fluctuation time is calculated from, for example, the radio wave line-of-sight space (Fresnel zone) based on the position of the wireless terminal and information on the moving speed of the wireless terminal.

As described above, in the outline of the present disclosure, the position and moving speed of a wireless terminal are predicted, and propagation change degree information is calculated based on the moving speed to determine whether the propagation of wireless communication will change within the expected delay time. do. The propagation change degree information is also used to determine the antenna and beam to be used for communication with the wireless terminal.

Below, with reference to FIG. 2, a wireless control device according to an overview of the present embodiment will be described. FIG. 2 is a block diagram illustrating a radio control device according to an overview of the embodiment. As shown in FIG. 2, the radio control device 20a includes a movement prediction section 22a, a propagation change determination section 24a, and a selection section 25a. The movement prediction section 22a, the propagation change determination section 24a, and the selection section 25a have functions as a movement prediction means, a propagation change determination means, and a selection means, respectively.

The movement prediction unit 22a predicts the movement of a wireless terminal that performs wireless communication. The propagation change determining unit 24a determines the degree of propagation change indicating how much the propagation including the received power of wireless communication changes within a predetermined expected delay time. The selection unit 25a selects at least one of an antenna and a beam used for wireless communication control with the wireless terminal, based on the propagation change degree determined by the propagation change determination unit 24a.

Here, the propagation change determining unit 24a may determine the degree of propagation change based on the relationship between the estimated delay time and the quality fluctuation time of wireless communication. Further, the propagation change determination unit 24a determines the degree of propagation change based on the estimated delay time of each wireless terminal, information indicating the line-of-sight space of radio waves used for wireless communication, and the relationship between predicted movement information of the wireless terminal. It's okay.

FIG. 3 is a flowchart illustrating a wireless control method according to an overview of the embodiment. As shown in step S1 of FIG. 3, movement of the wireless terminal is predicted. Specifically, the movement prediction unit 22a predicts the movement of a wireless terminal that performs wireless communication. Next, as shown in step S2, the degree of change in propagation is determined. For example, the propagation change determining unit 24a determines a propagation change degree that indicates how much the propagation including the received power of wireless communication changes within a predetermined expected delay time. Next, as shown in step S3, at least one of an antenna and a beam is selected based on the degree of propagation change. Specifically, the selection unit 25a selects at least one of an antenna and a beam used for wireless communication control with the wireless terminal, based on the determined degree of propagation change. In this way, wireless communication can be controlled.

In this way, the radio control device 20a of the present embodiment determines whether or not to add an antenna and a beam at the predicted position of the radio terminal by calculating the propagation change degree. The propagation change degree is calculated from the relationship between the estimated delay time for each wireless terminal and the wireless quality fluctuation time for each wireless terminal. Therefore, the radio control device 20a according to the present embodiment uses the propagation change degree to determine whether selection control of the antenna and beam at the predicted position is necessary, and then selects the antenna and beam to be used for radio communication. Thereby, stable communication quality can be achieved with the minimum necessary radio resources.

(Embodiment 1)
Next, a wireless communication system and a wireless base station device will be described as examples of the wireless control device according to the first embodiment. Below, with reference to the drawings, <configuration: system>, <configuration: wireless base station device>, <configuration: antenna beam prediction control unit>, <configuration: position estimation unit>, <configuration: movement prediction unit> , <Configuration: Propagation information database>, <Configuration: Propagation change degree determination section>, and <Configuration: Selection section> will be explained. After that, <Antenna and beam predictive control method> and <Effects> will be explained.

<Configuration: System>
FIG. 4 is a diagram illustrating the configuration of a wireless communication system according to the first embodiment. As shown in FIG. 4, the wireless communication system 1 includes a wireless base station device 100 and wireless terminals 210 and 220. The radio base station device 100 includes an aggregated base station 90 and a plurality of base station antennas 110 to 130. In this embodiment, the radio base station device 100 or the aggregate base station 90 includes a radio control device. A control device such as the wireless base station device 100 or the aggregated base station 90 performs wireless communication with the wireless terminals 210 and 220.

The plurality of base station antennas 110 to 130 are distributed and arranged. Each base station antenna 110-130 can output multiple beams. Note that although three base station antennas 110 to 130 are shown in the figure, the number of base station antennas 110 to 130 is not limited to three, and may be two or four or more. The base station antennas 110 to 130 are collectively referred to as the base station antenna 110 or the like.

Further, although the figure shows two wireless terminals 210 and 220, the number of wireless terminals 210 and 220 may be at least one, or may be three or more. Wireless terminals 210 and 220 are collectively referred to as wireless terminal 200. The wireless terminal 200 is, for example, a mobile terminal device such as a smartphone, a tablet, or a notebook computer. Furthermore, the wireless terminal 200 is a wearable device with a communication function, an information terminal such as AR (Augmented Reality) and VR (Virtual Reality) glasses, a game device, a camera, a car, an AGV (Automated Guided Vehicle), a robot, etc. It may also be industrial equipment or the like.

Wireless communication system 1 transmits and receives wireless signals between base station antennas 110 to 130 connected to aggregated base station 90 in wireless base station device 100 and wireless terminal 200.

<Configuration: Wireless base station device>
FIG. 5 is a block diagram illustrating the wireless base station device 100 in the wireless communication system 1 according to the first embodiment. As shown in FIG. 5, the base station antenna 110 and the like include a beam control section 140, an RF (Radio Frequency) transceiver section 150, and a plurality of antenna elements. The beam control section 140 and the RF transmitting/receiving section 150 have functions as a beam controlling means and an RF transmitting/receiving means, respectively. The aggregated base station 90 includes a digital transmitting/receiving section 10, an antenna beam prediction control section 20, and a radio resource control section 30. The digital transmitting/receiving section 10, the antenna beam prediction control section 20, and the radio resource control section 30 have functions as a digital transmitting/receiving means, an antenna beam prediction control means, and a radio resource control means, respectively.

A beam controller 140 such as the base station antenna 110 is connected to a plurality of antenna elements. The beam control unit 140 determines the direction of the beam by adjusting the phase and amplitude of the wireless signals for the plurality of antenna elements. The specific beam direction, beam number, etc. are specified by the radio resource control unit 30. As the beamforming means, means other than array antennas can also be applied. For example, beamforming using a directional antenna such as a lens antenna or a metamaterial antenna may be used.

The RF transmitter/receiver 150 includes an amplifier, a frequency converter, and the like. The RF transmitter/receiver 150 transmits and receives RF signals.

The digital transmitter/receiver 10 modulates and demodulates user data. For example, it performs processing such as generation of a downlink radio signal such as Orthogonal Frequency Division Multiplexing (OFDM) transmission, and demodulation (MIMO signal detection) of uplink radio signals received by multiple antennas. RoF (Radio over Fiber) technology, CPRI (Common Public Radio Interface) technology, eCPRI (evolved CPRI) technology, etc. are used between the digital transmitter/receiver 10 and the RF transmitter/receiver 150, and the functions are changed accordingly. It's okay.

The antenna/beam prediction control unit 20 predicts at least one of an antenna and a beam to be used for wireless communication with the wireless terminal 200. Specifically, the antenna beam prediction control unit 20 estimates the position information of the wireless terminal 200, predicts the position to which the wireless terminal 200 will move after the estimated delay time based on the position information, and Estimate the reception level of radio signals for each antenna and each beam. Further, the antenna beam prediction control unit 20 estimates the moving speed of the wireless terminal 200, and calculates a propagation change degree indicating how much the propagation will change within the assumed delay time based on the estimated moving speed. Then, the antenna/beam prediction control unit 20 uses the degree of propagation change to determine at least one of the antenna and beam to be used for communication with the wireless terminal 200. More specific operations will be detailed later.

The radio resource control unit 30 specifically determines the radio resources (antenna, beam, frequency, time, etc.) to be used for each radio terminal 200 based on the information determined by the antenna/beam prediction control unit 20. The radio resource control unit 30 is also called a scheduler unit.

<Configuration: Antenna beam prediction control section>
The antenna/beam prediction control unit 20 of this embodiment selects an antenna and a beam based on radio signal propagation information for each antenna and each beam at the predicted position. However, the necessity of controlling the selection of antennas and beams is controlled after calculating the degree of change in propagation using the moving speed. The degree of propagation change is determined from the relationship between the estimated delay time for each wireless terminal 200 and the wireless quality fluctuation time for each wireless terminal 200.

FIG. 6 is a block diagram illustrating the antenna beam prediction control section 20 in the radio base station apparatus 100 according to the first embodiment. As shown in FIG. 6, the antenna beam prediction control unit 20 includes a position estimation unit 21, a movement prediction unit 22, a propagation information database 23, a propagation change determination unit 24, and a selection unit 25. The position estimation unit 21, movement prediction unit 22, propagation information database 23, propagation change determination unit 24, and selection unit 25 function as a position estimation means, a movement prediction means, a propagation information storage means, a propagation change determination means, and a selection means, respectively. It has a function. Note that, as described later, any of the components of the antenna beam prediction control section 20 may be provided in an external device. In particular, the propagation information database 23 may be provided on an external device or cloud.

<Configuration: Position estimation section>
The position estimation unit 21 estimates the position of the wireless terminal 200 from the input position-related information. Any of the following methods can be applied to the method of estimating the position of the wireless terminal 200 in the position estimation unit 21.

The first method of estimating the position of the wireless terminal 200 uses the wireless signal of the wireless communication system 1. The position estimation unit 21 realizes position estimation of the wireless terminal 200 by using the beam direction (azimuth) of the connected single antenna and distance measurement. Further, distance measurement methods include a method of calculating from propagation time such as Round Trip Time, and a method of calculating distance based on a propagation model from the reception level. Furthermore, three-point positioning using multiple antennas may be used. Alternatively, the difference in propagation time between a plurality of antennas may be used. Alternatively, the position may be estimated by linking information on the reception level of a plurality of antennas with position information. Further, these methods may be used hierarchically. For example, the position of the general frame may be estimated based on the beam direction and distance measurement, and the detailed position within the general frame may be estimated from information on the reception levels of a plurality of antennas.

In this manner, the position estimation unit 21 may estimate the position of the wireless terminal 200 based on at least one of propagation information, received power information, and radio wave arrival time information. The propagation information includes the direction and distance of the beam propagated from the above-mentioned antenna. The received power information includes information on the received levels of multiple antennas.

The second method of estimating the position of the wireless terminal 200 is a method of determining the position using external information such as GPS (Global Positioning System). Sensors other than GPS (such as an accelerometer) may also be used. Alternatively, the location information of the wireless terminal 200 may be directly acquired from the outside.

<Configuration: Movement prediction unit>
Movement prediction unit 22 predicts movement of wireless terminal 200. As the movement prediction method in the movement prediction unit 22, any of the following methods can be applied.

The first movement prediction method predicts the position, movement speed, and direction after a predetermined time by performing extrapolation (for example, linear interpolation) from the time series of position information of the wireless terminal 200. Alternatively, prediction may be made by linear (first-order) and curved (higher-order) regression from the time series of position information.

The second movement prediction method predicts the position, movement speed, and direction of the wireless terminal 200 based on information on the past movement history of the wireless terminal 200. A model of the moving direction and moving speed is generated using the time series of past position information of the wireless terminal 200. The movement of the wireless terminal 200 is predicted by using this model. Moreover, map information that can use information on sidewalks, roads, passages, railroad tracks, etc. may be used to generate the model. Further, the above model may be generated by learning using information on the past movement history of the wireless terminal 200.

In this way, the movement prediction unit 22 determines the position of the wireless terminal 200 based on at least one of the time series of the position information of the wireless terminal 200, the movement history of the wireless terminal 200, and the map around the wireless terminal 200. Predict movement speed and direction.

Further, the predicted position may be smoothed using at least one of moving average processing and various filters (Kalman filter, particle filter, etc.).

<Configuration: Propagation information database (propagation information storage unit)>
The propagation information database 23 receives and records received power information, beam information, and antenna information of radio signals from the base station antenna 110 and the like measured by the radio terminal 200. The propagation information database 23 stores received power information input from the wireless terminal 200 or from the received power measurement unit of the base station as propagation information. Here, as for the measurement results of received power at the wireless terminal 200, the wireless terminal 200 reports the measurement results of synchronization signals and reference signals to the base station antenna 110 and the like. The synchronization signal includes, for example, an NR PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal). The reference signal is, for example, NR's PBCH-DMRS (Physical Broadcast Channel-Demodulation Reference Signal) and CSI-RS (Channel State Information-Reference Signal). nal).

When beamforming is used, each synchronization signal and each reference signal are beam-transmitted, so the propagation information database 23 also accepts and records measured beam information (beam number, etc.). Further, if information on the connected base station antenna 110 and the like can be acquired on the wireless terminal 200 side, the propagation information database 23 is reported from the wireless terminal 200 with this information. Since the beam information and antenna information are values set by the base station antenna 110 or the like, the propagation information database 23 may be acquired from inside the base station antenna 110 or the like.

In addition to or separately from the above, the propagation information database 23 receives and records received power information, beam information, and antenna information of the base station antenna 110 and the like. The reception power at base station antenna 110 and the like may be measured using a reference signal transmitted from wireless terminal 200. The reference signal includes, for example, SRS (Sounding Reference Signal), DMRS (Demodulation Reference Signal), and the like. The propagation information database 23 records reception beam information, antenna information, etc. at the base station antenna 110 and the like used when receiving the reference signal.

Further, the propagation information database 23 receives and records the position information of the wireless terminal 200 from the position estimation unit 21. The position information may be managed using coordinate information such as latitude and longitude, or may be managed using grid numbers when the area is divided into grids.

The propagation information database 23 does not need to record all information regarding the wireless terminal 200 (received power, beam information, antenna information, position, etc.), but only representative values such as average values and intermediate values. It's okay. Alternatively, the propagation information database 23 may reduce the amount of information by forgetting past values. The propagation information database 23 may manage position information using coordinate information such as latitude and longitude, or may use grid numbers when an area is divided into grids.

<Configuration: Propagation change determination section>
FIG. 7 is a block diagram illustrating the propagation change determination unit 24 according to the first embodiment. As shown in FIG. 7, the propagation change determination section 24 includes an expected delay time calculation section 26, a radio line-of-sight space calculation section 27, a radio quality fluctuation time calculation section 28, and a degree of change determination section 29. The expected delay time calculation unit 26, the radio line-of-sight space calculation unit 27, the radio quality fluctuation time calculation unit 28, and the degree of change determination unit 29 are configured to calculate an expected delay time, a radio line-of-sight space calculation unit, and a radio quality fluctuation, respectively. It has the functions of time calculation means and change degree determination means.

The estimated delay time calculation unit 26 calculates an estimated delay time from the estimated delay information. The radio-wave line-of-sight space calculation unit 27 calculates a radio-wave line-of-sight space from movement prediction information including movement speed information, position information, and movement direction information. The wireless quality fluctuation time calculation unit 28 calculates the wireless quality fluctuation time from the movement prediction information and the radio wave line-of-sight space. The change degree determining unit 29 calculates the propagation change degree from the estimated delay time and the radio quality fluctuation time.

With such a configuration, the propagation change determination unit 24 calculates propagation change degree information using assumed delay information and movement prediction information. Note that the propagation change degree information is used to determine whether or not at least one of antenna addition, antenna switching, beam addition, and beam switching is necessary.

The propagation change degree information is as follows: 1. Estimated delay time for each wireless terminal 200; 2. It is calculated from the relationship with the wireless quality fluctuation time for each wireless terminal 200.

1. The expected delay time is the time from the timing when received power information is received to the time when the antenna and beam selected based on the received power information are enabled. The expected delay time may be referred to as the time from the timing at which received power information is received until it is updated by the next received received power information.

2. The wireless quality fluctuation time is the time required for the wireless quality including received power to drop below a predetermined threshold when radio waves used for wireless communication are blocked by a shielding object. If the expected delay time is longer than the wireless quality fluctuation time, there is a possibility that the wireless quality will be extremely degraded due to shielding during communication using the selected antenna and beam. On the other hand, if the expected delay time is sufficiently short compared to the radio quality fluctuation time, even if the selected antenna and beam are blocked during communication, it is possible to update to the next selected antenna and beam. That is, it means that even when the wireless quality during communication is partially degraded, it is possible to update to the antenna and beam selected based on the next received received power information. Here, the relationship may be a "ratio" or a "difference (comparison of magnitude)."

Below, with reference to the drawings, 1. expected delay time for each wireless terminal 200; and 2. The wireless quality fluctuation time for each wireless terminal 200 will be explained.

FIG. 8 is a graph illustrating reference delay time information in the propagation change determination unit 24 according to the first embodiment, and controls the reference interval of received power information, candidate beam selection, communication beam determination, etc. Indicates the timing of communication using the determined communication beam.

As shown in FIG. 8, the estimated delay time for each wireless terminal 200 is calculated using estimated delay information from the radio resource control unit 30, as an example. The expected delay information includes reference delay time information based on the required reference acquisition interval of received power information, control delay, and the like. Furthermore, the estimated delay time may include information on the allocation interval for each wireless terminal 200. In this case, the estimated delay time for each wireless terminal 200 may be calculated by multiplying a part of the reference delay time information by the allocation interval information for each wireless terminal 200. In the case of the figure, the expected delay time of the wireless terminal 200 with allocation interval=2 is (t+2s), etc.

FIG. 9 is a diagram illustrating Fresnel zones and Fresnel radii in the propagation change determination unit 24 according to the first embodiment. As shown in FIG. 9, the wireless quality fluctuation time for each wireless terminal 200 is calculated using the moving speed information for each wireless terminal 200. For example, the wireless quality fluctuation time for each wireless terminal 200 is calculated from the width of the radio line-of-sight space (for example, the Fresnel radius or diameter in a Fresnel zone) and the time that the wireless terminal 200 passes through.

Here, the width of the radio line-of-sight space may be fixedly set based on the frequency used by the wireless communication system 1. Furthermore, the width of the radio line-of-sight space is determined by determining the antenna spacing, the distance between the antenna closest to the wireless terminal 200 and the wireless terminal 200, etc. using the position information of the wireless terminal 200 and the installed antenna position information. It may also be calculated using a calculation formula such as Fresnel radius or diameter based on the Fresnel radius or diameter.

For example, the distance between the transmitting antenna of the wireless terminal 200 and the shielding object 300 is d1 (meter, hereinafter referred to as m), and the distance between the receiving antenna such as the base station antenna 110 and the shielding object 300 is d2. (m) and the frequency used is f (Megahertz, hereinafter referred to as Mhz), the Fresnel radius r(m) is expressed by the following equation (1).

r=√[(300/f)×{(d1×d2)/(d1+d2)}] (1)
Note that the symbol "/" in formula (1) represents division.

That is, the width of the radio wave line-of-sight space may include the Fresnel radius in the Fresnel zone centered on the shield 300. Further, the width of the radio wave line-of-sight space may be calculated from the Fresnel radius, diameter, or the like after estimating the moving angle of the wireless terminal 200 with respect to the antenna using information about the moving direction of the wireless terminal 200. Note that the distance to the shielding object 300 is determined depending on the assumed wireless environment (for example, in the case of an environment in which the wireless terminal 200 moves near the shielding object 300, the distance to the shielding object 300 is determined by 50 centimeters (hereinafter referred to as cm) or 1 (cm). m), but is not limited to this).

Then, the wireless quality fluctuation time is calculated as the time required for passage from the width of the radio wave line-of-sight space for each wireless terminal 200 calculated above and the moving speed information for each wireless terminal 200 estimated by the movement prediction unit 22. be done. For example, the wireless quality fluctuation time is calculated by dividing the width of the radio line-of-sight space by the moving speed of each wireless terminal 200. The wireless quality fluctuation time is the time it takes for the wireless quality to deteriorate when radio waves are blocked by a shielding object 300 such as an obstacle.

Finally, propagation change degree information is calculated from the relationship between the estimated delay time for each wireless terminal 200 and the wireless quality fluctuation time. 10A and 10B are graphs illustrating changes in propagation (wireless quality) according to the first embodiment, where the horizontal axis indicates time and the vertical axis indicates propagation (wireless quality) of wireless communication. The graph of FIG. 10A shows a large degree of propagation change, and the graph of FIG. 10B shows a small degree of propagation change. The change degree determining unit 29 calculates such a propagation change degree. There is no problem with any of the following calculation methods.

As a first method, for example, the degree of propagation change is calculated from the ratio (ratio) of the estimated delay time of each wireless terminal 200 to the wireless quality fluctuation time of each wireless terminal 200. Then, the value of this ratio (rate) is output as propagation change degree information. Note that if the value of this ratio (ratio) is 1 or more, it means that the expected delay time is longer. In this case, if the antenna and beam remain in communication and are blocked by the shielding object 300 during the expected delay time, the quality of wireless communication may be significantly degraded (FIG. 10A). Therefore, the propagation change determination unit 24 (or selection unit 25) determines that selection control of the antenna and beam at the predicted position is “necessary (valid)”.

On the other hand, if the value of this ratio (ratio) is less than 1, it means that the wireless quality fluctuation time is longer. In this case, even if the antenna and beam during communication are blocked by the shielding object 300, the antenna and beam will be updated based on the next received power information before the wireless communication quality deteriorates significantly. It is possible (FIG. 10B). Therefore, the propagation change determination unit 24 (or selection unit 25) determines that the antenna and beam selection control at the predicted position is “unnecessary (invalid)”. The determination is performed by the change degree determination unit 29 in the propagation change determination unit 24, but may also be performed by the selection unit 25.

As a second method, for example, the degree of propagation change is calculated from the difference (comparison of magnitude) between the estimated delay time of each wireless terminal 200 and the wireless quality fluctuation time of each wireless terminal 200. Then, the value of this difference (comparison of magnitude) is output as propagation change degree information. Note that if the value of this difference is positive (0 or more), it means that the expected delay time is longer. In this case, if the antenna and beam remain in communication and are blocked by the shielding object 300 during the expected delay time, the quality of wireless communication may deteriorate significantly. Therefore, the propagation change determination unit 24 (or selection unit 25) determines that selection control of the antenna and beam at the predicted position is “necessary (valid)”.

On the other hand, if the value of this difference is negative (less than 0), it means that the wireless quality fluctuation time is longer. In this case, even if the antenna and beam during communication are blocked by the shielding object 300, the antenna and beam will be updated based on the next received power information before the wireless communication quality deteriorates significantly. It is possible. Therefore, the propagation change determination unit 24 (or selection unit 25) determines that the antenna and beam selection control at the predicted position is “unnecessary (invalid)”. The determination is performed by the change degree determination unit 29 in the propagation change determination unit 24, but may also be performed by the selection unit 25.

In this way, the propagation change determining unit 24 determines the degree of propagation change by calculating the degree of propagation change, and determines whether or not selection control including addition and switching of antennas and beams is necessary based on the determined degree of propagation change. . Further, the propagation change determination unit 24 determines the degree of propagation change by calculating the degree of propagation change, and the selection unit 25 adds and switches antennas and beams based on the degree of propagation change determined by the propagation change determination unit 24. The necessity of selection control including the above may be determined.

In addition, these criteria are not simply determined as a binary value of 1 or more (less than 1) or positive (negative), but also a predetermined margin and threshold value may be set, or a probability value is determined as a continuous value. It may also be reflected in the antenna and beam selection control.

<Configuration: Selection section>
The selection unit 25 selects at least one of an antenna and a beam to be used at the predicted position input from the movement prediction unit 22. 11A to 11C are diagrams illustrating received power of a current beam and a selected beam according to the first embodiment. As shown in FIGS. 11A to 11C, for example, the selection unit 25 compares the received power of the current beam and the received power of the selected beam, thereby selecting at least one of the antennas and beams used for wireless communication. Choose one.

The first antenna and beam selection method is a method of accessing the registration information of the wireless terminal 200 recorded in the propagation information database 23 and determining the antenna and beam to be used. The propagation information database 23 stores position information, received power for each antenna and each beam at each position, and information regarding the antenna index and beam index that have a large received power at each position. The selection unit 25 accesses information regarding the position closest to the position information input from the movement prediction unit 22 and the received power for each antenna and each beam in the nearest grid. Then, the selection unit 25 selects at least one of the antenna number and beam number from which the maximum received power can be obtained.

If the selected antenna number and beam number are the same as the antenna number and beam number currently used for wireless communication, change to the antenna number and beam number used for wireless communication such as the base station antenna 110. does not occur. Note that the antenna number and beam number currently used for wireless communication may be updated using received power information, or may be updated using information input from the radio resource control unit 30.

If the selected antenna number is the same as the antenna number currently used for wireless communication, but the selected beam number is different from the beam number currently used for wireless communication, the selection unit 25 , you can also change to the selected beam number. Alternatively, if the antenna is composed of a plurality of subarrays, the selection unit 25 can also use both the beam number of the selected beam number and the beam number of the current wireless communication. Alternatively, if the received power of the current beam number at the predicted position is greater than or equal to a predetermined threshold (FIG. 11A), the selection unit 25 does not need to change the beam number. If the received power of the current beam number at the predicted position is below the threshold (FIG. 11B or FIG. 11C), the selection unit 25 changes to the beam of the selected beam number. Alternatively, the selection unit 25 may use both the beam of the selected beam number and the current beam number.

If the selected antenna number is different from the antenna number currently used for wireless communication, the selection unit 25 can change the antenna number to the selected antenna number. Alternatively, the selection unit 25 can also use both antennas for wireless communication. Alternatively, if the received power of the current antenna number (and the beam number with the highest received power) at the predicted position is greater than or equal to a predetermined threshold, the selection unit 25 does not need to change the antenna number. Only when the received power of the current antenna number is below the threshold, the selection unit 25 changes the antenna number to the selected antenna number, or changes the antenna number of both the selected antenna number and the antenna number of the current wireless communication. May be used.

The second method for selecting antennas and beams is to select information between the base station antenna 110, etc. and the wireless terminal 200 on a two-dimensional map or three-dimensional map, instead of the received power and position information reported from the wireless terminal 200. Based on radio wave propagation prediction (for example, propagation simulation using ray tracing), the received power for each antenna and each beam is calculated according to the propagation information. In this case, the two-dimensional map or three-dimensional map also reflects the size, position, etc. of the object that is the shielding object 300, and by performing propagation simulation on these maps, each antenna can be determined according to the propagation information at each point. and estimate the received power level for each beam. In addition, in this case, it is necessary to model the propagation information according to the surrounding environment, and the characteristics of the radio waves in the surrounding environment (for example, in the case of a train on the tracks, the angular direction with respect to the wireless terminal 200 inside the train). (e.g. penetration loss).

This simulation may be performed in real time. Alternatively, a simulation may be performed in advance and the results may be recorded in the propagation information database 23 and referred to as needed. Furthermore, both the received power estimation result obtained by propagation simulation and the received power value reported from the wireless terminal 200 may be used. The selected antenna number and beam number are sent to the radio resource control unit 30 in the aggregation base station 90, and radio resource control is performed based on this information.

Note that the selection unit 25 also uses the propagation change degree information from the propagation change determination unit 24 to implement the above-mentioned first or second selection control. For example, when the propagation change degree information is 1 or more or positive (≧0), the propagation change determination unit 24 (or selection unit 25) determines that selection control including addition and switching of antennas and beams is necessary (valid). ), and the selection unit 25 performs the selection control described above. On the other hand, if the propagation change degree information is less than 1 or negative (<0), the propagation change determination unit 24 determines that selection control including addition and switching of antennas and beams is unnecessary (invalid). Then, the selection unit 25 does not perform the above-described selection control, but performs control using at least one of the antenna and beam currently in communication.

If selection control including addition and switching of antennas and beams is invalid (unnecessary), the antenna number and beam number currently in communication may be used as they are, or may be updated using received power information. Alternatively, information input from the radio resource control unit 30 may be used for updating. In addition, instead of simply determining the binary value of 1 or more (less than 1) and positive (negative), a predetermined margin may be set, or the antenna and beam can be selected probabilistically as a continuous value. Control may also be performed. For example, the control based on the predicted position and the control based on the information being communicated may be probabilistically integrated.

In this way, the selection unit 25 obtains information on the received power for each antenna and for each beam at the position of the wireless terminal 200 predicted by the movement prediction unit 22 from the propagation information database 23 that stores received power information as propagation information. Receive. Then, the selection unit 25 selects one of the plurality of antennas and beams to use for wireless communication control with the wireless terminal 200 based on information on received power for each antenna and each beam at the predicted position of the wireless terminal 200. select at least one of the antenna and beam.

The selection unit 25 may select at least one of an antenna and a beam used for wireless communication with the wireless terminal 200. Further, the selection unit 25 may select at least one of an antenna and a beam used for radio resource control with the radio terminal 200.

If selection control including addition and switching of antennas and beams is required, the selection unit 25 selects the received power for each antenna and each beam at the position of the wireless terminal 200 predicted by the movement prediction unit 22. , an antenna, and/or a beam. If selection control including addition and switching of antennas and beams is not required, the selection unit 25 selects at least one of the antenna and beam based on information on the received power of at least one of the antenna and beam during communication. You may choose.

In addition, the selection unit 25 selects at least one of the antennas and beams selected based on the received power information for each antenna and each beam at the position of the wireless terminal 200 predicted by the movement prediction unit 22, and the antenna and the beam in communication. An antenna and at least one of the beams may be selected with a predetermined probability based on information on received power of at least one of the beams.

<Antenna and beam predictive control method>
Next, a method for predictive control of antennas and beams will be explained. FIG. 12 is a flowchart illustrating a predictive control method in the antenna beam predictive control unit 20 according to the first embodiment.

As shown in step S11 of FIG. 12, the position of the wireless terminal 200 is estimated. For example, the position estimation unit 21 in the antenna beam prediction control unit 20 may estimate the position of the wireless terminal 200 using a radio signal used within the wireless communication system 1. Further, the position estimating unit 21 may estimate the position of the wireless terminal 200 using external information such as GPS. Alternatively, the location information of the wireless terminal 200 may be directly acquired from the outside.

Next, as shown in step S12, movement of the wireless terminal 200 is predicted. For example, the movement prediction unit 22 may predict the movement of the wireless terminal 200 from the time series of the position information of the wireless terminal 200 by extrapolation or linear or curved regression. Further, the movement prediction unit 22 may predict the movement of the wireless terminal 200 based on information on the past movement history of the wireless terminal 200.

Next, as shown in step S13, the degree of change in propagation is calculated and determined. For example, the propagation change determining unit 24 calculates and determines the degree of propagation change indicating how much the propagation including the received power of wireless communication changes within a predetermined expected delay time. The propagation change determination unit 24 may determine the degree of propagation change based on the relationship between the estimated delay time and the radio quality fluctuation time.

Next, as shown in step S14, antenna selection and beam selection are performed based on the degree of propagation change and the predicted position of wireless terminal 200. FIG. 13 is a flowchart illustrating a predictive control method in the propagation change determination unit 24 and selection unit 25 according to the first embodiment.

As shown in step S21 in FIG. 13, the propagation change determination unit 24 determines whether to enable (necessary) or disable (unnecessary) the antenna and beam selection control based on the calculated degree of propagation change. In step S21, if the propagation change determination unit 24 determines that it is valid (necessary), as shown in step S22, the selection unit 25 selects not only the information on the antenna and beam currently in communication but also the predicted wireless Antenna selection and beam selection are controlled based on the location of terminal 200.

On the other hand, if the propagation change determination unit 24 determines that the communication is invalid (unnecessary) in step S21, the selection unit 25 performs control using the antenna and beam during communication, as shown in step S23. In this way, predictive control of the antenna and beam is performed. Note that the determination is made by the propagation change determining section 24, but may also be made by the selecting section 25.

<Effect>
Next, the effects of this embodiment will be explained. In the embodiment described above, the antenna beam prediction control unit 20 calculates the degree of propagation change using the moving speed information. The antenna/beam prediction control unit 20 uses the calculated propagation change degree information to determine whether or not to control the selection of antennas and beams at the predicted position. Then, the antenna/beam prediction control section 20 selects the antenna and beam to be used for communication. Thereby, stable communication quality can be achieved with the minimum necessary radio resources.

The reason is as follows. Multiple beam and antenna selections based on both current conditions and predicted locations can limit system throughput due to redundant use of radio resources. To address this problem, in the present embodiment, for example, the degree of propagation change is calculated for each wireless terminal 200 from the relationship between the estimated delay time and the wireless quality fluctuation time. If it is determined from the propagation change degree information determined by the propagation change determination unit 24 that antenna and beam selection control is unnecessary, the selection unit 25 performs antenna and beam selection control at the predicted position of the wireless terminal 200. Not performed. Therefore, redundant use of wireless resources can be suppressed while maintaining stable communication quality.

For example, even if the quality of the antenna and beam selected based on the predicted position is better, if the degree of propagation change is small, the communication quality will be so high that the connection will be interrupted even with the current antenna and beam. There will be no decline. Therefore, it is possible to control to select new antennas and beams at the next control timing without adding antennas and beams based on predicted positions. Thereby, the antennas and beams that were not added can be allocated to other wireless terminals 200, for example, so that wireless resources can be used effectively.

Note that this embodiment also includes a feature in which the necessity of antenna and beam selection control is determined by calculating the degree of propagation change only from the moving speed information of each wireless terminal 200. In particular, this embodiment has a feature of calculating the estimated delay time and radio wave line-of-sight space for each wireless terminal 200 to calculate the degree of propagation change. Therefore, even if the wireless terminals 200 move at the same speed, the determination results will differ depending on the delay and environment of each wireless terminal 200 at that time. Therefore, there is an advantage that more optimal radio resource control (antenna selection and beam selection) can be realized.

(Embodiment 2)
Next, a second embodiment will be described. This embodiment includes additional elements to the configuration of at least one of the embodiments described above.

For example, in this embodiment, the following method can be further implemented as a propagation change determination method and a method of using propagation change degree information.

The propagation change determination unit 24 may consider the moving speed of not only the wireless terminal 200 but also the shielding object 300 including obstacles and the like. When a moving shield 300 is assumed and the moving speed and direction of the shield 300 can be estimated, the propagation change determination unit 24 determines the propagation change by using the relative velocity with respect to the speed of the wireless terminal 200 as the moving speed of the shield 300. The degree of change may also be calculated. For example, if there is a possibility that the wireless terminal 200 at speed A and the shielding object 300 at speed B move oppositely on the same straight line, the propagation change determination unit 24 calculates the moving speed as A+B. good. Furthermore, if the moving speed and direction of the shielding object 300 are not known, the propagation change determination unit 24 may assume the moving speed and direction of the shielding object 300 in a fixed manner according to the environment. Further, the propagation change determination unit 24 may assume that the moving speed of the wireless terminal 200 that moves fastest among other wireless terminals 200 near the target wireless terminal 200 is the speed of the shielding object 300.

The propagation change determination unit 24 may output information on the degree of propagation change. Then, the above-mentioned movement prediction unit 22 (or selection unit 25) may update the movement prediction including the predicted time and predicted position of the wireless terminal 200 using the information on the degree of propagation change. For example, when the propagation change determination unit 24 outputs the calculated ratio (proportion) as information on the degree of propagation change, the movement prediction unit 22 may multiply the predicted time based on the information on the degree of propagation change. On the other hand, for example, when the propagation change determination unit 24 outputs the calculated difference (comparison of magnitude) as information on the degree of propagation change, the movement prediction unit 22 adds the predicted time based on the information on the degree of propagation change. Or you can subtract. Although the above example shows that the movement prediction unit 22 updates the predicted time, as another method, the selection unit 25 updates the information on the degree of propagation change from the relationship between the current position and the original predicted position. may be used to update the predicted position corresponding to the predicted time to be updated.

Furthermore, for example, as a method for selecting antennas and beams, the following method can be further implemented.

The selection unit 25 inputs slice information for each wireless terminal 200 and each wireless communication from the upper control device or the wireless base station device 100, and selects selection control requirements including addition and switching of antennas and beams based on the slice information. You may decide no. For example, if the slice information is a slice that particularly requires reliability, the selection unit 25 always performs control such as enabling (requiring) antenna and beam selection control based on the predicted position. Good too. On the other hand, for example, in the case of a slice with no problem even if the reliability is low, the selection unit 25 always disables (unnecessarily) the antenna and beam selection control using the predicted position, and selects the current received power. Selection control of antennas and beams may be performed based on the information.

When using antenna and beam selection control based on information registered in the propagation information database 23, the surrounding environment may be different from that recorded and learned in the propagation information database 23 (such as shielding from large trucks, etc.). (if object 300 is parked). In such cases, it may not be possible to select an appropriate antenna and beam.

Therefore, the received power for each antenna and each beam actually used for communication at the current position and multiple positions leading up to the current position is compared with the received power registered in the propagation information database 23. conduct. Then, the prediction accuracy of the propagation information database 23 can be evaluated from the comparison results. As a result of the comparison, if it is determined that the prediction accuracy is high, the antenna number and beam number selected based on the results registered in the propagation information database 23 are used. On the other hand, if it is determined that the prediction accuracy is low, the antenna number and beam number currently used for communication are not changed. Furthermore, in the case between the two, both antenna numbers and both beam numbers may be used.

In this way, the selection unit 25 selects the measured values of received power for each antenna and each beam actually used for wireless communication at the current position and the position in the movement history of the wireless terminal 200, and the received power for each antenna predicted at each position. At least one of the antenna and the beam may be selected after evaluating the prediction accuracy by comparison with the received power of each beam.

In the above description, it is assumed that one set of antenna numbers and beam numbers are selected by the selection unit 25, but it is also possible to select multiple sets of antenna numbers and beam numbers. For example, the level of the estimated value of the received power for the antenna number and beam number currently used for communication and the antenna number and beam number selected by the selection unit 25 may be low. In that case, it is also possible to additionally set the antenna number and beam number that are estimated to have the next highest received power. By doing this, although redundancy increases, there is a possibility that connectivity can be improved.

In addition, as another method for selecting a plurality of sets of antenna numbers and beam numbers, the selection unit 25 can select not only the position predicted by movement prediction, but also the selection unit 25 from the current position to the position predicted by movement prediction. It is also possible to add and set (select) multiple sets of antenna numbers and beam numbers based on multiple positions. In this case as well, although redundancy increases, there is a possibility that connectivity can be improved.

In this way, the selection unit 25 determines antenna and beam usage candidates for the plurality of positions predicted by the movement prediction unit 22, and selects at least one of the antennas and beams to be actually used from among all the candidates. may be selected. In addition, the selection unit 25 selects antennas based on the relationship between the predicted received power of antennas and beams that are candidates for selection, the measured values of received power of antennas and beams in communication, and a predetermined threshold value of received power. and at least one of the beams may be selected.

On the other hand, using a large number of antennas and beams also limits system throughput. Therefore, in consideration of the current radio resource usage rate of the base station antenna 110, etc., control according to the radio resource usage rate is used, such as allowing the use of redundant antennas and beams only when the radio resource usage rate is low. It's okay. Specifically, the selection unit 25 may determine the number of antennas to be used simultaneously and the number of beams to be used simultaneously according to the radio resource usage rate.

In addition, as another method for efficiently using radio resources, as described above, the selection unit 25 uses the measured values of the received power of the antenna and beam during communication, and each antenna and beam that are candidates for selection at the predicted position. At least one of the antenna and the beam may be selected based on the relationship between the predicted received power of the beam and a predetermined threshold of the received power. For example, the selection unit 25 may add or select an antenna and a beam at the predicted position only when the predicted value of the received power of the antenna and beam currently communicating at the predicted position decreases by exceeding a predetermined threshold. good.

The selection unit 25 may select antennas and beams based not only on the predicted position of the wireless terminal 200 a predetermined time ahead, but also on the predicted positions of the plurality of wireless terminals 200 further ahead. For example, if the antenna number estimated to have the maximum power changes many times at the predicted positions of a plurality of wireless terminals 200, the selection unit 25 selects an antenna that can avoid frequent changes in the antenna number. You can also choose a number.

At least one of position estimation and movement prediction is not estimated or predicted within the radio base station device 100, but the location information of the radio terminal 200 (the location of the radio terminal 200 in any time period) and Movement prediction information (location information and movement speed of the wireless terminal 200 predicted after the estimated delay time), etc. may be acquired.

Furthermore, the moving speed of the wireless terminal 200 may be calculated from the Doppler frequency estimated from wireless quality information such as received power information.

It is also possible to select antennas and beams in consideration of the accuracy of position information (at least one of position estimation and movement prediction). For example, the selection unit 25 may select at least one of an antenna and a beam using a plurality of predicted positions as candidates, depending on the accuracy of the position information.

If it is determined that the accuracy of the predicted position information of the wireless terminal 200 is low, the propagation information database 23 is referred to at the positions of several wireless terminals 200 in the direction of the position information. It is also possible to set a plurality of antenna numbers and beam numbers for which the maximum received power at each position is predicted. For example, when position information is managed in a grid, the antenna number and beam number for which the maximum received power is predicted are set, including the surrounding grids of the grid containing the predicted position predicted by the movement prediction unit 22. It's okay.

The radio base station apparatus 100, the antenna beam prediction control section 20, the position estimation section 21, the movement prediction section 22, the propagation change determination section 24, and the selection section 25 shown in FIGS. Although it is described as part of the above, it is not limited thereto. For example, a part or all of the units in FIGS. 5 to 7 may be implemented in any of the RU (Radio Unit), DU (Distributed Unit), and CU (Central Unit) of the wireless base station. Further, some or all of the units in FIGS. 5 to 7 may be implemented in an external device other than the radio base station device 100, such as an RIC (RAN Intelligent Controller).

In this way, the radio control device includes a first control device and a second control device, and at least one of the position estimation section 21, movement prediction section 22, propagation information database 23, propagation change determination section 24, and selection section 25. , which are provided in the first control device, and among the position estimation section 21, movement prediction section 22, propagation information database 23, propagation change determination section 24, and selection section 25, those provided in the first control device are the second control device. It may be provided in the device. The first control device and the second control device in this case may be any one of the radio base station device 100, RU, DU, CU, and RIC.

In addition, it is applicable not only to wireless communication such as millimeter waves, but also to terahertz wave (sub-terahertz wave) communication, optical space communication (free space optical communication), visible light communication (optical wireless communication), etc. It's okay.

Note that the present disclosure is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit. For example, an embodiment in which the configurations of Embodiments 1 and 2 are combined is also included in the scope of the technical idea. Moreover, a wireless control program that causes a computer to execute a wireless control method is also included in the scope of the technical idea.

The wireless control device 20a described above may be, for example, an information processing device such as a microcomputer, a personal computer, or a server. FIG. 14 is a block diagram illustrating a case where the radio control device 20a according to the first and second embodiments is implemented by an information processing device. As shown in FIG. 14, the information processing device 400 may include a processor PRC, a memory MMR, and a storage device STR. The storage device STR may store the processing performed by each component of the wireless control device 20a as a program. Further, the processor PRC may read a program from the storage device STR into the memory MMR and execute the program. Thereby, the processor PRC realizes the functions of each component in the radio control device 20a. The information processing device 400 performs the radio control shown in FIG. 2 by having the processor PRC execute programs corresponding to the movement prediction unit 22a, the propagation change determination unit 24a, and the selection unit 25a while referring to the memory MMR and the storage device STR. A device 20a may also be implemented.

Each configuration included in the wireless control device 20a may be realized by dedicated hardware. Moreover, a part or all of each component may be realized by a general-purpose or dedicated circuit, a processor PRC, etc., or a combination thereof. These may be configured by a single chip or multiple chips connected via a bus. Part or all of each component may be realized by a combination of the circuits and the like described above and a program. Further, as the processor PRC, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an FPGA (Field-programmable Gate Array), a quantum processor (quantum computer control chip), etc. can be used.

Further, in the case where a part or all of each component of the wireless control device 20a is realized by a plurality of information processing devices, circuits, etc., the plurality of information processing devices, circuits, etc. may be centrally arranged, It may also be distributed. For example, information processing devices, circuits, and the like may be realized by a client server system, a cloud computing system, or the like, in which each is connected via a communication network. Further, the functions of the wireless control device 20a may be provided in a SaaS (Software as a Service) format.

The program includes a group of instructions (or software code) for causing the computer to perform one or more of the functions described in the embodiments when the program is read into the wireless control device 20a or the like including the computer. The program may be stored on a non-transitory computer readable medium or a tangible storage medium. By way of example and not limitation, computer readable or tangible storage media may include random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD -Includes ROM, digital versatile disc (DVD), Blu-ray disc or other optical disc storage, magnetic cassette, magnetic tape, magnetic disc storage or other magnetic storage device. The program may be transmitted on a transitory computer-readable medium or a communication medium. By way of example and not limitation, transitory computer-readable or communication media includes electrical, optical, acoustic, or other forms of propagating signals.

Part or all of the above embodiments may be described as in the following additional notes, but are not limited to the following.

(Additional note 1)
a movement prediction unit that predicts movement of a wireless terminal that performs wireless communication;
a propagation change determination unit that determines a propagation change degree indicating the degree to which the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time;
Based on the propagation change degree determined by the propagation change determination unit, at least one of the antenna and the beam used for wireless communication control with the wireless terminal is selected from among the plurality of antennas and the plurality of beams. a selection section to
A wireless control device equipped with
(Additional note 2)
The selection section is
receiving information on the received power for each of the antennas and for each beam at the position of the wireless terminal predicted by the movement prediction unit from a propagation information storage unit that stores information on the received power as propagation information;
At least one of the antenna and the beam used for the wireless communication control with the wireless terminal is selected based on information on the received power for each antenna and each beam at the predicted position of the wireless terminal. select,
The wireless control device according to supplementary note 1.
(Additional note 3)
The propagation change determination unit includes:
determining the degree of change in propagation by calculating the degree of change in propagation;
determining whether selection control including addition and switching of the antenna and the beam is necessary from the determined degree of propagation change;
The wireless control device according to supplementary note 2.
(Additional note 4)
The propagation change determination unit determines the propagation change degree by calculating the propagation change degree,
The selection unit determines whether selection control including addition and switching of the antenna and the beam is necessary based on the propagation change degree determined by the propagation change determination unit.
The wireless control device according to supplementary note 2.
(Appendix 5)
The selection unit selects at least one of the antenna and the beam used for the wireless communication with the wireless terminal.
The wireless control device according to any one of Supplementary Notes 1 to 4.
(Appendix 6)
The selection unit selects at least one of the antenna and the beam used for radio resource control with the wireless terminal.
The wireless control device according to any one of Supplementary Notes 1 to 4.
(Appendix 7)
The propagation change determining unit determines the degree of propagation change based on the relationship between the assumed delay time and the quality fluctuation time of the wireless communication.
The wireless control device according to any one of Supplementary Notes 1 to 6.
(Appendix 8)
The expected delay time includes the time from the timing when the received power information is received until it is updated by the next received received power information.
The wireless control device according to appendix 7.
(Appendix 9)
The quality fluctuation time of the wireless communication includes the time during which the received power decreases to a predetermined threshold or less when the radio waves used for the wireless communication are blocked by a shielding object.
The wireless control device according to appendix 7 or 8.
(Appendix 10)
The quality fluctuation time of the wireless communication is calculated by dividing the width of the line-of-sight space of the radio wave by the moving speed of the wireless terminal.
The wireless control device according to any one of Supplementary Notes 7 to 9.
(Appendix 11)
The width of the line-of-sight space of the radio wave includes a Fresnel radius or diameter in a Fresnel zone between the wireless terminal and the radio terminal.
The wireless control device according to appendix 10.
(Appendix 12)
The propagation change determination unit determines the propagation change degree based on the estimated delay time for each wireless terminal, information indicating line-of-sight space of radio waves used for the wireless communication, and predicted movement information of the wireless terminal. determine,
The wireless control device according to any one of Supplementary Notes 1 to 11.
(Appendix 13)
The propagation change determination unit outputs the propagation change degree,
The movement prediction unit updates the movement prediction of the wireless terminal based on the output propagation change degree.
The wireless control device according to any one of Supplementary Notes 1 to 12.
(Appendix 14)
The selection section is
When the selection control is necessary, at least one of the antenna and the beam is selected based on information on the received power for each antenna and each beam at the position of the wireless terminal predicted by the movement prediction unit. Select
If the selection control is not necessary, selecting at least one of the antenna and the beam based on information on the received power of at least one of the antenna and the beam during communication;
The wireless control device according to appendix 3 or 4.
(Appendix 15)
The selection unit is in communication with at least one of the antenna and the beam selected based on information on the received power for each antenna and each beam at the position of the wireless terminal predicted by the movement prediction unit. at least one of the antenna and the beam selected based on information on the received power of at least one of the antenna and the beam, with a predetermined probability;
The wireless control device according to any one of Supplementary Notes 1 to 14.
(Appendix 16)
The movement prediction unit predicts the position and speed of the wireless terminal based on at least one of a time series of position information of the wireless terminal, a movement history of the wireless terminal, and a map around the wireless terminal. ,
The wireless control device according to any one of Supplementary Notes 1 to 15.
(Appendix 17)
further comprising a position estimation unit that estimates the position of the wireless terminal;
The wireless control device according to any one of Supplementary Notes 1 to 16.
(Appendix 18)
The position estimation unit estimates the position of the wireless terminal based on at least one of the propagation information, the received power information, and radio wave arrival time information.
The wireless control device according to appendix 17.
(Appendix 19)
The selection unit is configured to determine the relationship between the received power predicted for the antenna and the beam that are candidates for selection, the measured value of the received power for the antenna and the beam during communication, and a predetermined threshold value of the received power. selecting at least one of the antenna and the beam based on;
The wireless control device according to any one of Supplementary Notes 1 to 18.
(Additional note 20)
The selection unit selects at least one of the antenna and the beam based on a plurality of positions from the current position of the wireless terminal to the position predicted by the movement prediction unit.
The wireless control device according to any one of Supplementary Notes 1 to 19.
(Additional note 21)
The selection unit selects the measured values of the received power for each antenna and each beam actually used for the wireless communication at the current position and the position in the movement history of the wireless terminal, and the antenna predicted at each position. selecting at least one of the antenna and the beam after evaluating prediction accuracy by comparison with the received power for each beam and for each beam;
The wireless control device according to any one of Supplementary Notes 1 to 20.
(Additional note 22)
The selection unit selects at least one of the antenna and the beam using a plurality of predicted positions as candidates, depending on the accuracy of the position information.
The wireless control device according to any one of Supplementary Notes 1 to 21.
(Additional note 23)
The selection unit determines the number of antennas to be used simultaneously and the number of beams to be used simultaneously, according to a radio resource usage rate.
The wireless control device according to any one of Supplementary Notes 1 to 22.
(Additional note 24)
The selection unit determines usage candidates for the antenna and the beam for the plurality of positions predicted by the movement prediction unit, and selects at least one of the antenna and the beam to be actually used from among all candidates. select,
The wireless control device according to any one of Supplementary Notes 1 to 23.
(Additional note 25)
The selection unit inputs slice information for each wireless terminal and each wireless communication from an upper control device or a wireless base station device, and performs selection including addition and switching of the antenna and the beam based on the slice information. Deciding whether control is necessary,
The wireless control device according to any one of Supplementary Notes 1 to 24.
(Additional note 26)
comprising a first control device and a second control device;
At least one of the movement prediction unit, the propagation change determination unit, and the selection unit is provided in the first control device,
Among the movement prediction section, the propagation change determination section, and the selection section, those other than those provided in the first control device are provided in the second control device.
The wireless control device according to any one of Supplementary Notes 1 to 25.
(Appendix 1A)
a movement prediction unit that predicts movement of a wireless terminal that performs wireless communication;
a propagation change determination unit that determines a propagation change degree indicating the degree to which the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time;
Based on the propagation change degree determined by the propagation change determination unit, at least one of the antenna and the beam used for wireless communication control with the wireless terminal is selected from among the plurality of antennas and the plurality of beams. a selection section to
Wireless base station equipment equipped with
(Appendix 2A)
The selection section is
receiving information on the received power for each of the antennas and for each beam at the position of the wireless terminal predicted by the movement prediction unit from a propagation information storage unit that stores information on the received power as propagation information;
At least one of the antenna and the beam used for the wireless communication control with the wireless terminal is selected based on information on the received power for each antenna and each beam at the predicted position of the wireless terminal. select,
The radio base station device according to appendix 1A.
(Appendix 3A)
The propagation change determination unit includes:
determining the degree of change in propagation by calculating the degree of change in propagation;
determining whether selection control including addition and switching of the antenna and the beam is necessary from the determined degree of propagation change;
The radio base station device according to appendix 2A.
(Appendix 4A)
The propagation change determination unit determines the propagation change degree by calculating the propagation change degree,
The selection unit determines whether selection control including addition and switching of the antenna and the beam is necessary based on the propagation change degree determined by the propagation change determination unit.
The radio base station device according to appendix 2A.
(Appendix 5A)
The selection unit selects at least one of the antenna and the beam used for the wireless communication with the wireless terminal.
The wireless base station device according to any one of Supplementary Notes 1A to 4A.
(Appendix 6A)
The selection unit selects at least one of the antenna and the beam used for radio resource control with the wireless terminal.
The wireless base station device according to any one of Supplementary Notes 1A to 4A.
(Appendix 7A)
The propagation change determining unit determines the degree of propagation change based on the relationship between the assumed delay time and the quality fluctuation time of the wireless communication.
The radio base station device according to any one of Supplementary Notes 1A to 6A.
(Appendix 8A)
The expected delay time includes the time from the timing when the received power information is received until it is updated by the next received received power information.
The wireless base station device according to appendix 7A.
(Appendix 9A)
The quality fluctuation time of the wireless communication includes the time during which the received power decreases to a predetermined threshold or less when the radio waves used for the wireless communication are blocked by a shielding object.
The wireless base station device according to appendix 7A or 8A.
(Appendix 10A)
The quality fluctuation time of the wireless communication is calculated by dividing the width of the line-of-sight space of the radio wave by the moving speed of the wireless terminal.
The wireless base station device according to any one of Supplementary Notes 7A to 9A.
(Appendix 11A)
The width of the line-of-sight space of the radio wave includes a Fresnel radius or diameter in a Fresnel zone between the wireless terminal and the radio terminal.
The radio base station device according to appendix 10A.
(Appendix 12A)
The propagation change determination unit determines the propagation change degree based on the estimated delay time for each wireless terminal, information indicating line-of-sight space of radio waves used for the wireless communication, and predicted movement information of the wireless terminal. determine,
The wireless base station device according to any one of Supplementary Notes 1A to 11A.
(Appendix 13A)
The propagation change determination unit outputs the propagation change degree,
The movement prediction unit updates the movement prediction of the wireless terminal based on the output propagation change degree.
The wireless base station device according to any one of Supplementary Notes 1A to 12A.
(Appendix 14A)
The selection section is
When the selection control is necessary, at least one of the antenna and the beam is selected based on information on the received power for each antenna and each beam at the position of the wireless terminal predicted by the movement prediction unit. Select
If the selection control is not necessary, selecting at least one of the antenna and the beam based on information on the received power of at least one of the antenna and the beam during communication;
The wireless base station device according to appendix 3A or 4A.
(Appendix 15A)
The selection unit is in communication with at least one of the antenna and the beam selected based on information on the received power for each antenna and each beam at the position of the wireless terminal predicted by the movement prediction unit. at least one of the antenna and the beam selected based on information on the received power of at least one of the antenna and the beam, with a predetermined probability;
The wireless base station device according to any one of Supplementary Notes 1A to 14A.
(Appendix 16A)
The movement prediction unit predicts the position and speed of the wireless terminal based on at least one of a time series of position information of the wireless terminal, a movement history of the wireless terminal, and a map around the wireless terminal. ,
The wireless base station device according to any one of Supplementary Notes 1A to 15A.
(Appendix 17A)
further comprising a position estimation unit that estimates the position of the wireless terminal;
The wireless base station device according to any one of Supplementary Notes 1A to 16A.
(Appendix 18A)
The position estimation unit estimates the position of the wireless terminal based on at least one of the propagation information, the received power information, and radio wave arrival time information.
The radio base station device according to appendix 17A.
(Appendix 19A)
The selection unit is configured to determine the relationship between the received power predicted for the antenna and the beam that are candidates for selection, the measured value of the received power for the antenna and the beam during communication, and a predetermined threshold value of the received power. selecting at least one of the antenna and the beam based on;
The wireless base station device according to any one of Supplementary Notes 1A to 18A.
(Appendix 20A)
The selection unit selects at least one of the antenna and the beam based on a plurality of positions from the current position of the wireless terminal to the position predicted by the movement prediction unit.
The wireless base station device according to any one of Supplementary Notes 1A to 19A.
(Appendix 21A)
The selection unit selects the measured values of the received power for each antenna and each beam actually used for the wireless communication at the current position and the position in the movement history of the wireless terminal, and the antenna predicted at each position. selecting at least one of the antenna and the beam after evaluating prediction accuracy by comparison with the received power for each beam and for each beam;
The wireless base station device according to any one of Supplementary Notes 1A to 20A.
(Appendix 22A)
The selection unit selects at least one of the antenna and the beam using a plurality of predicted positions as candidates, depending on the accuracy of the position information.
The wireless base station device according to any one of Supplementary Notes 1A to 21A.
(Appendix 23A)
The selection unit determines the number of antennas to be used simultaneously and the number of beams to be used simultaneously, according to a radio resource usage rate.
The wireless base station device according to any one of Supplementary Notes 1A to 22A.
(Appendix 24A)
The selection unit determines usage candidates for the antenna and the beam for the plurality of positions predicted by the movement prediction unit, and selects at least one of the antenna and the beam to be actually used from among all candidates. select,
The radio base station device according to any one of Supplementary Notes 1A to 23A.
(Appendix 25A)
The selection unit inputs slice information for each wireless terminal and each wireless communication from an upper control device or a wireless base station device, and performs selection including addition and switching of the antenna and the beam based on the slice information. Deciding whether control is necessary,
The radio base station device according to any one of Supplementary Notes 1A to 24A.
(Appendix 26A)
comprising a first control device and a second control device;
At least one of the movement prediction unit, the propagation change determination unit, and the selection unit is provided in the first control device,
Among the movement prediction section, the propagation change determination section, and the selection section, those other than those provided in the first control device are provided in the second control device.
The wireless base station device according to any one of Supplementary Notes 1A to 25A.
(Appendix 1B)
at least one wireless terminal;
a wireless control device that performs wireless communication with the wireless terminal;
Equipped with
The wireless control device includes:
a movement prediction unit that predicts movement of the wireless terminal;
a propagation change determination unit that determines a propagation change degree indicating the degree to which the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time;
Based on the propagation change degree determined by the propagation change determination unit, at least one of the antenna and the beam used for wireless communication control with the wireless terminal is selected from among the plurality of antennas and the plurality of beams. a selection section to
A wireless communication system equipped with
(Appendix 2B)
The selection section is
receiving information on the received power for each of the antennas and for each beam at the position of the wireless terminal predicted by the movement prediction unit from a propagation information storage unit that stores information on the received power as propagation information;
At least one of the antenna and the beam used for the wireless communication control with the wireless terminal is selected based on information on the received power for each antenna and each beam at the predicted position of the wireless terminal. select,
The wireless communication system described in Appendix 1B.
(Appendix 3B)
The propagation change determination unit includes:
determining the degree of change in propagation by calculating the degree of change in propagation;
determining whether selection control including addition and switching of the antenna and the beam is necessary from the determined degree of propagation change;
The wireless communication system described in Appendix 2B.
(Appendix 4B)
The propagation change determination unit determines the propagation change degree by calculating the propagation change degree,
The selection unit determines whether selection control including addition and switching of the antenna and the beam is necessary based on the propagation change degree determined by the propagation change determination unit.
The wireless communication system described in Appendix 2B.
(Appendix 5B)
The selection unit selects at least one of the antenna and the beam used for the wireless communication with the wireless terminal.
The wireless communication system according to any one of Supplementary Notes 1B to 4B.
(Appendix 6B)
The selection unit selects at least one of the antenna and the beam used for radio resource control with the wireless terminal.
The wireless communication system according to any one of Supplementary Notes 1B to 4B.
(Appendix 7B)
The propagation change determining unit determines the degree of propagation change based on the relationship between the assumed delay time and the quality fluctuation time of the wireless communication.
The wireless communication system according to any one of Supplementary Notes 1B to 6B.
(Appendix 8B)
The expected delay time includes the time from the timing when the received power information is received until it is updated by the next received received power information.
Wireless communication system according to Appendix 7B.
(Appendix 9B)
The quality fluctuation time of the wireless communication includes the time during which the received power decreases to a predetermined threshold or less when the radio waves used for the wireless communication are blocked by a shielding object.
The wireless communication system according to appendix 7B or 8B.
(Appendix 10B)
The quality fluctuation time of the wireless communication is calculated by dividing the width of the line-of-sight space of the radio wave by the moving speed of the wireless terminal.
The wireless communication system according to any one of Supplementary Notes 7B to 9B.
(Appendix 11B)
The width of the line-of-sight space of the radio wave includes a Fresnel radius or diameter in a Fresnel zone between the wireless terminal and the radio terminal.
Wireless communication system according to appendix 10B.
(Appendix 12B)
The propagation change determination unit determines the propagation change degree based on the estimated delay time for each wireless terminal, information indicating line-of-sight space of radio waves used for the wireless communication, and predicted movement information of the wireless terminal. determine,
The wireless communication system according to any one of Supplementary Notes 1B to 11B.
(Appendix 13B)
The propagation change determination unit outputs the propagation change degree,
The movement prediction unit updates the movement prediction of the wireless terminal based on the output propagation change degree.
The wireless communication system according to any one of Supplementary Notes 1B to 12B.
(Appendix 14B)
The selection section is
When the selection control is necessary, at least one of the antenna and the beam is selected based on information on the received power for each antenna and each beam at the position of the wireless terminal predicted by the movement prediction unit. Select
If the selection control is not necessary, selecting at least one of the antenna and the beam based on information on the received power of at least one of the antenna and the beam during communication;
The wireless communication system according to appendix 3B or 4B.
(Appendix 15B)
The selection unit is in communication with at least one of the antenna and the beam selected based on information on the received power for each antenna and each beam at the position of the wireless terminal predicted by the movement prediction unit. at least one of the antenna and the beam selected based on information on the received power of at least one of the antenna and the beam, with a predetermined probability;
The wireless communication system according to any one of Supplementary Notes 1B to 14B.
(Appendix 16B)
The movement prediction unit predicts the position and speed of the wireless terminal based on at least one of a time series of position information of the wireless terminal, a movement history of the wireless terminal, and a map around the wireless terminal. ,
The wireless communication system according to any one of Supplementary Notes 1B to 15B.
(Appendix 17B)
further comprising a position estimation unit that estimates the position of the wireless terminal;
The wireless communication system according to any one of Supplementary Notes 1B to 16B.
(Appendix 18B)
The position estimation unit estimates the position of the wireless terminal based on at least one of the propagation information, the received power information, and radio wave arrival time information.
Wireless communication system according to appendix 17B.
(Appendix 19B)
The selection unit is configured to determine the relationship between the received power predicted for the antenna and the beam that are candidates for selection, the measured value of the received power for the antenna and the beam during communication, and a predetermined threshold value of the received power. selecting at least one of the antenna and the beam based on;
The wireless communication system according to any one of Supplementary Notes 1B to 18B.
(Appendix 20B)
The selection unit selects at least one of the antenna and the beam based on a plurality of positions from the current position of the wireless terminal to the position predicted by the movement prediction unit.
The wireless communication system according to any one of Supplementary Notes 1B to 19B.
(Appendix 21B)
The selection unit selects the measured values of the received power for each antenna and each beam actually used for the wireless communication at the current position and the position in the movement history of the wireless terminal, and the antenna predicted at each position. selecting at least one of the antenna and the beam after evaluating prediction accuracy by comparison with the received power for each beam and for each beam;
The wireless communication system according to any one of Supplementary Notes 1B to 20B.
(Appendix 22B)
The selection unit selects at least one of the antenna and the beam using a plurality of predicted positions as candidates, depending on the accuracy of the position information.
The wireless communication system according to any one of Supplementary Notes 1B to 21B.
(Appendix 23B)
The selection unit determines the number of antennas to be used simultaneously and the number of beams to be used simultaneously, according to a radio resource usage rate.
The wireless communication system according to any one of Supplementary Notes 1B to 22B.
(Appendix 24B)
The selection unit determines usage candidates for the antenna and the beam for the plurality of positions predicted by the movement prediction unit, and selects at least one of the antenna and the beam to be actually used from among all candidates. select,
The wireless communication system according to any one of Supplementary Notes 1B to 23B.
(Appendix 25B)
The selection unit inputs slice information for each wireless terminal and each wireless communication from an upper control device or a wireless base station device, and performs selection including addition and switching of the antenna and the beam based on the slice information. Deciding whether control is necessary,
The wireless communication system according to any one of Supplementary Notes 1B to 24B.
(Appendix 26B)
The wireless control device has a first control device and a second control device,
At least one of the movement prediction unit, the propagation change determination unit, and the selection unit is provided in the first control device,
Among the movement prediction section, the propagation change determination section, and the selection section, those other than those provided in the first control device are provided in the second control device.
The wireless communication system according to any one of Supplementary Notes 1B to 25B.
(Appendix 1C)
Predict the movement of wireless terminals performing wireless communication,
determining a propagation change degree indicating the degree to which the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time;
selecting at least one of the antenna and the beam used for wireless communication control with the wireless terminal from among the plurality of antennas and the plurality of beams based on the determined degree of propagation change;
Wireless control method.
(Appendix 2C)
When selecting at least one of the antenna and the beam,
receiving information on the received power for each antenna and each beam at the predicted position of the wireless terminal from a propagation information storage unit that stores information on the received power as propagation information;
At least one of the antenna and the beam used for the wireless communication control with the wireless terminal is selected based on information on the received power for each antenna and each beam at the predicted position of the wireless terminal. select,
The wireless control method described in Appendix 1C.
(Appendix 3C)
When determining the degree of change in propagation,
determining the degree of change in propagation by calculating the degree of change in propagation;
determining whether selection control including addition and switching of the antenna and the beam is necessary from the determined degree of propagation change;
The wireless control method described in Appendix 2C.
(Appendix 4C)
When determining the degree of change in propagation,
determining the degree of change in propagation by calculating the degree of change in propagation;
When selecting at least one of the antenna and the beam,
determining whether selection control including addition and switching of the antenna and the beam is necessary from the determined degree of propagation change;
The wireless control method described in Appendix 2C.
(Appendix 5C)
When selecting at least one of the antenna and the beam,
selecting at least one of the antenna and the beam used for the wireless communication with the wireless terminal;
The wireless control method according to any one of Supplementary Notes 1C to 4C.
(Appendix 6C)
When selecting at least one of the antenna and the beam,
selecting at least one of the antenna and the beam used for radio resource control with the wireless terminal;
The wireless control method according to any one of Supplementary Notes 1C to 4C.
(Appendix 7C)
When determining the degree of change in propagation,
determining the degree of propagation change from the relationship between the assumed delay time and the quality fluctuation time of the wireless communication;
The wireless control method according to any one of Supplementary Notes 1C to 6C.
(Appendix 8C)
The expected delay time includes the time from the timing when the received power information is received until it is updated by the next received received power information.
The wireless control method described in Appendix 7C.
(Appendix 9C)
The quality fluctuation time of the wireless communication includes the time during which the received power decreases to a predetermined threshold or less when the radio waves used for the wireless communication are blocked by a shielding object.
The wireless control method according to appendix 7C or 8C.
(Appendix 10C)
The quality fluctuation time of the wireless communication is calculated by dividing the width of the line-of-sight space of the radio wave by the moving speed of the wireless terminal.
The wireless control method according to any one of Supplementary Notes 7C to 9C.
(Appendix 11C)
The width of the line-of-sight space of the radio wave includes a Fresnel radius or diameter in a Fresnel zone between the wireless terminal and the radio terminal.
The wireless control method described in Appendix 10C.
(Appendix 12C)
When determining the degree of change in propagation,
determining the degree of propagation change from the relationship between the estimated delay time for each wireless terminal, information indicating a line-of-sight space of radio waves used for wireless communication, and predicted movement information of the wireless terminal;
The wireless control method according to any one of Supplementary Notes 1C to 11C.
(Appendix 13C)
When determining the degree of change in propagation,
outputting the degree of change in propagation;
When predicting the movement of the wireless terminal,
updating a prediction of movement of the wireless terminal based on the outputted propagation change degree;
The wireless control method according to any one of Supplementary Notes 1C to 12C.
(Appendix 14C)
When selecting at least one of the antenna and the beam,
If the selection control is necessary, selecting at least one of the antenna and the beam based on the received power information for each antenna and each beam at the predicted position of the wireless terminal,
If the selection control is not necessary, selecting at least one of the antenna and the beam based on information on the received power of at least one of the antenna and the beam during communication;
The wireless control method according to appendix 3C or 4C.
(Appendix 15C)
When selecting at least one of the antenna and the beam,
At least one of the antenna and the beam is in communication with at least one of the antenna and the beam selected based on information on the received power for each antenna and each beam at the predicted position of the wireless terminal. selecting at least one of the antenna and the beam selected based on information on the received power of the antenna with a predetermined probability;
The wireless control method according to any one of Supplementary Notes 1C to 14C.
(Appendix 16C)
When predicting the movement of the wireless terminal,
predicting the position and speed of the wireless terminal based on at least one of a time series of position information of the wireless terminal, a movement history of the wireless terminal, and a map around the wireless terminal;
The wireless control method according to any one of Supplementary Notes 1C to 15C.
(Appendix 17C)
Further, estimating the location of the wireless terminal;
The wireless control method according to any one of Supplementary Notes 1C to 16C.
(Appendix 18C)
When estimating the location of the wireless terminal,
estimating the position of the wireless terminal based on at least one of the propagation information, the received power information, and radio wave arrival time information;
The wireless control method described in Appendix 17C.
(Appendix 19C)
When selecting at least one of the antenna and the beam,
Based on the relationship between the received power predicted for the antenna and the beam that are candidates for selection, the measured value of the received power for the antenna and the beam during communication, and a predetermined threshold value of the received power, selecting at least one of the antenna and the beam;
The wireless control method according to any one of Supplementary Notes 1C to 18C.
(Appendix 20C)
When selecting at least one of the antenna and the beam,
selecting at least one of the antenna and the beam based on a plurality of positions from the current position of the wireless terminal to a predicted position;
The wireless control method according to any one of Supplementary Notes 1C to 19C.
(Appendix 21C)
When selecting at least one of the antenna and the beam,
Measured values of the received power for each antenna and each beam actually used for the wireless communication at the current position and the position in the movement history of the wireless terminal, and the received power for each antenna and each beam predicted at each position. selecting at least one of the antenna and the beam after evaluating prediction accuracy by comparison with the received power of
The wireless control method according to any one of Supplementary Notes 1C to 20C.
(Appendix 22C)
When selecting at least one of the antenna and the beam,
selecting at least one of the antenna and the beam using a plurality of predicted positions as candidates according to the accuracy of the position information;
The wireless control method according to any one of Supplementary Notes 1C to 21C.
(Appendix 23C)
When selecting at least one of the antenna and the beam,
determining the number of antennas to be used simultaneously and the number of beams to be used simultaneously according to a radio resource usage rate;
The wireless control method according to any one of Supplementary Notes 1C to 22C.
(Appendix 24C)
When selecting at least one of the antenna and the beam,
determining usage candidates for the antenna and the beam for a plurality of predicted positions, and selecting at least one of the antenna and the beam to be actually used from among all candidates;
The wireless control method according to any one of Supplementary Notes 1C to 23C.
(Appendix 25C)
When selecting at least one of the antenna and the beam,
Slice information for each wireless terminal and each wireless communication is input from a higher-level control device or a wireless base station device, and based on the slice information, the necessity of selection control including addition and switching of the antenna and the beam is determined. decide,
The wireless control method according to any one of Supplementary Notes 1C to 24C.
(Appendix 1D)
Predict the movement of wireless terminals that perform wireless communication,
determining a propagation change degree indicating the degree to which the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time;
selecting at least one of the antenna and the beam used for wireless communication control with the wireless terminal from among the plurality of antennas and the plurality of beams based on the determined degree of propagation change;
A wireless control program that causes a computer to perform certain tasks.
(Appendix 2D)
When selecting at least one of the antenna and the beam,
receiving information on the received power for each antenna and each beam at the predicted position of the wireless terminal from a propagation information storage unit that stores information on the received power as propagation information;
At least one of the antenna and the beam used for the wireless communication control with the wireless terminal is selected based on information on the received power for each antenna and each beam at the predicted position of the wireless terminal. let you choose,
The wireless control program according to appendix 1D that causes a computer to execute the following.
(Appendix 3D)
When determining the degree of change in propagation,
determining the degree of change in propagation by calculating the degree of change in propagation;
determining whether or not selection control including addition and switching of the antenna and the beam is necessary from the determined degree of propagation change;
The wireless control program according to appendix 2D that causes a computer to execute the following.
(Appendix 4D)
When determining the degree of change in propagation,
determining the degree of change in propagation by calculating the degree of change in propagation;
When selecting at least one of the antenna and the beam,
determining the necessity of selection control including addition and switching of the antenna and the beam from the determined degree of propagation change;
The wireless control program according to appendix 2D that causes a computer to execute the following.
(Appendix 5D)
When selecting at least one of the antenna and the beam,
selecting at least one of the antenna and the beam used for the wireless communication with the wireless terminal;
The wireless control program according to any one of Supplementary Notes 1D to 4D, which causes a computer to execute the following.
(Appendix 6D)
When selecting at least one of the antenna and the beam,
selecting at least one of the antenna and the beam used for radio resource control with the wireless terminal;
The wireless control program according to any one of Supplementary Notes 1D to 4D, which causes a computer to execute the following.
(Appendix 7D)
When determining the degree of change in propagation,
determining the degree of propagation change from the relationship between the assumed delay time and the quality fluctuation time of the wireless communication;
The wireless control program according to any one of Supplementary notes 1D to 6D, which causes a computer to execute the following.
(Appendix 8D)
The expected delay time includes the time from the timing when the received power information is received until it is updated by the next received received power information.
The wireless control program described in Appendix 7D.
(Appendix 9D)
The quality fluctuation time of the wireless communication includes the time during which the received power decreases to a predetermined threshold or less when the radio waves used for the wireless communication are blocked by a shielding object.
The wireless control program described in Appendix 7D or 8D.
(Appendix 10C)
The quality fluctuation time of the wireless communication is calculated by dividing the width of the line-of-sight space of the radio wave by the moving speed of the wireless terminal.
The wireless control program according to any one of Supplementary Notes 7D to 9D.
(Appendix 11D)
The width of the line-of-sight space of the radio wave includes a Fresnel radius or diameter in a Fresnel zone between the wireless terminal and the radio terminal.
The wireless control program described in Appendix 10D.
(Appendix 12D)
When determining the degree of change in propagation,
determining the degree of propagation change from the estimated delay time for each wireless terminal, information indicating line-of-sight space of radio waves used for the wireless communication, and predicted movement information of the wireless terminal;
The wireless control program according to any one of Supplementary Notes 1D to 11D, which causes a computer to execute the following.
(Appendix 13D)
When determining the degree of change in propagation,
outputting the degree of change in propagation;
When predicting the movement of the wireless terminal,
updating a prediction of movement of the wireless terminal based on the outputted propagation change degree;
The wireless control program according to any one of Supplementary Notes 1D to 12D, which causes a computer to execute the following.
(Appendix 14D)
When selecting at least one of the antenna and the beam,
If the selection control is necessary, at least one of the antenna and the beam is selected based on the received power information for each antenna and each beam at the predicted position of the wireless terminal,
If the selection control is not necessary, at least one of the antenna and the beam is selected based on information on the received power of at least one of the antenna and the beam during communication.
The wireless control program according to supplementary note 3D or 4D that causes a computer to execute the following.
(Appendix 15D)
When selecting at least one of the antenna and the beam,
At least one of the antenna and the beam is in communication with at least one of the antenna and the beam selected based on information on the received power for each antenna and each beam at the predicted position of the wireless terminal. at least one of the antenna and the beam selected based on information on the received power of the antenna and the beam at a predetermined probability;
The wireless control program according to any one of Supplementary Notes 1D to 14D, which causes a computer to execute the following.
(Appendix 16D)
When predicting the movement of the wireless terminal,
Predicting the position and speed of the wireless terminal based on at least one of a time series of position information of the wireless terminal, a movement history of the wireless terminal, and a map around the wireless terminal;
The wireless control program according to any one of Supplementary Notes 1D to 15D, which causes a computer to execute the following.
(Appendix 17D)
Further, estimating the position of the wireless terminal;
The wireless control program according to any one of Supplementary Notes 1D to 16D, which causes a computer to execute the following.
(Appendix 18D)
When estimating the position of the wireless terminal,
estimating the position of the wireless terminal based on at least one of the propagation information, the received power information, and radio wave arrival time information;
The wireless control program according to appendix 17D that causes a computer to execute the following.
(Appendix 19D)
When selecting at least one of the antenna and the beam,
Based on the relationship between the received power predicted for the antenna and the beam that are candidates for selection, the measured value of the received power for the antenna and the beam during communication, and a predetermined threshold value of the received power, selecting at least one of the antenna and the beam;
The wireless control program according to any one of Supplementary Notes 1D to 18D, which causes a computer to execute the following.
(Appendix 20D)
When selecting at least one of the antenna and the beam,
selecting at least one of the antenna and the beam based on a plurality of positions from the current position of the wireless terminal to a predicted position;
The wireless control program according to any one of Supplementary Notes 1D to 19D, which causes a computer to execute the following.
(Appendix 21D)
When selecting at least one of the antenna and the beam,
Measured values of the received power for each antenna and each beam actually used for the wireless communication at the current position and the position in the movement history of the wireless terminal, and the received power for each antenna and each beam predicted at each position. selecting at least one of the antenna and the beam after evaluating prediction accuracy by comparison with the received power of
The wireless control program according to any one of Supplementary Notes 1D to 20D, which causes a computer to execute the following.
(Appendix 22D)
When selecting at least one of the antenna and the beam,
selecting at least one of the antenna and the beam using a plurality of predicted positions as candidates according to the accuracy of the position information;
The wireless control program according to any one of Supplementary Notes 1D to 21D, which causes a computer to execute the following.
(Appendix 23D)
When selecting at least one of the antenna and the beam,
determining the number of antennas to be used simultaneously and the number of beams to be used simultaneously according to a radio resource usage rate;
The wireless control program according to any one of Supplementary Notes 1D to 22D, which causes a computer to execute the following.
(Appendix 24D)
When selecting at least one of the antenna and the beam,
determining usage candidates for the antenna and the beam for a plurality of predicted positions, and selecting at least one of the antenna and the beam to be actually used from among all the candidates;
The wireless control program according to any one of Supplementary Notes 1D to 23D, which causes a computer to execute the following.
(Appendix 25D)
When selecting at least one of the antenna and the beam,
Slice information for each wireless terminal and each wireless communication is input from an upper control device or a wireless base station device, and based on the slice information, the necessity of selection control including addition and switching of the antenna and the beam is determined. let decide,
The wireless control program according to any one of Supplementary Notes 1D to 24D, which causes a computer to execute the following.

1 Wireless communication system 10 Digital transmission/reception unit 20 Antenna beam prediction control unit 20a Radio control device 21 Position estimation unit 22, 22a Movement prediction unit 23 Propagation information database 24, 24a Propagation change determination unit 25, 25a Selection unit 26 Estimated delay time calculation Section 27 Radio line-of-sight space calculation section 28 Radio quality fluctuation time calculation section 29 Change degree determination section 30 Radio resource control section 90 Aggregation base station 100 Radio base station devices 110, 120, 130 Base station antenna 140 Beam control section 150 RF transmission/reception Units 200, 210, 220 Wireless terminal 300 Shielding object 310 Shielding section 400 Information processing device PRC Processor MMR Memory STR Storage device

Claims (10)

a movement prediction unit that predicts movement of a wireless terminal that performs wireless communication;
a propagation change determination unit that determines a propagation change degree indicating the degree to which the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time;
Based on the propagation change degree determined by the propagation change determination unit, at least one of the antenna and the beam used for wireless communication control with the wireless terminal is selected from among the plurality of antennas and the plurality of beams. a selection section to
A wireless control device equipped with The selection section is
receiving information on the received power for each of the antennas and for each beam at the position of the wireless terminal predicted by the movement prediction unit from a propagation information storage unit that stores information on the received power as propagation information;
At least one of the antenna and the beam used for the wireless communication control with the wireless terminal is selected based on information on the received power for each antenna and each beam at the predicted position of the wireless terminal. select,
The wireless control device according to claim 1. The propagation change determination unit includes:
determining the degree of change in propagation by calculating the degree of change in propagation;
determining whether selection control including addition and switching of the antenna and the beam is necessary from the determined degree of propagation change;
The wireless control device according to claim 2. The propagation change determination unit determines the propagation change degree by calculating the propagation change degree,
The selection unit determines whether selection control including addition and switching of the antenna and the beam is necessary based on the propagation change degree determined by the propagation change determination unit.
The wireless control device according to claim 2. The selection unit selects at least one of the antenna and the beam used for the wireless communication with the wireless terminal.
The wireless control device according to claim 1 or 2. The selection unit selects at least one of the antenna and the beam used for radio resource control with the wireless terminal.
The wireless control device according to claim 1 or 2. The propagation change determining unit determines the degree of propagation change based on the relationship between the assumed delay time and the quality fluctuation time of the wireless communication.
The wireless control device according to claim 1 or 2. at least one wireless terminal;
a wireless control device that performs wireless communication with the wireless terminal;
Equipped with
The wireless control device includes:
a movement prediction unit that predicts movement of the wireless terminal;
a propagation change determination unit that determines a propagation change degree indicating the degree to which the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time;
Based on the propagation change degree determined by the propagation change determination unit, at least one of the antenna and the beam used for wireless communication control with the wireless terminal is selected from among the plurality of antennas and the plurality of beams. a selection section to
A wireless communication system equipped with Predict the movement of wireless terminals performing wireless communication,
determining a propagation change degree indicating the degree to which the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time;
selecting at least one of the antenna and the beam used for wireless communication control with the wireless terminal from among the plurality of antennas and the plurality of beams based on the determined degree of propagation change;
Wireless control method. Predict the movement of wireless terminals that perform wireless communication,
determining a propagation change degree indicating the degree to which the propagation of the wireless communication including the received power of the wireless communication changes within a predetermined expected delay time;
selecting at least one of the antenna and the beam used for wireless communication control with the wireless terminal from among the plurality of antennas and the plurality of beams based on the determined degree of propagation change;
A wireless control program that causes a computer to perform certain tasks.

Images