Control device, wireless terminal, method, and program

Abstract

To provide a control device, a wireless terminal, a method, and a program that can accurately determine wireless operations to be applied to a wireless terminal.SOLUTION: A control device according to the present disclosure is a control device that controls at least one base station, and includes an area setting unit that divides at least one communication area of the at least one base station into multiple subareas on the basis of an index indicating wireless channel characteristics or the coverage areas of each of multiple beams of the at least one base station, and a determination unit that determines a communication operation to be applied to a target terminal on the basis of information related to the subarea corresponding to the target terminal.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a control device, a wireless terminal, a method, and a program. [Background technology]

[0002] A technique has been proposed for allocating radio resources in a cell based on statistical information about channel conditions according to the location in the cell (for example, Patent Document 1). In the technique disclosed in Patent Document 1, a cell is divided into multiple regions, and channel-related information is accumulated for each region. Then, based on the channel-related information accumulated for each region, regional statistical information about the channel conditions for each region is generated. Then, a base station identifies the region in which a wireless terminal is located, and allocates radio resources based on the regional statistical information corresponding to the region. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-15521 Summary of the Invention [Problem to be solved by the invention]

[0004] However, there is a possibility that the channel conditions at each of multiple points within a region may vary. However, in the technology disclosed in Patent Document 1, the region is fixed, so the region statistical information may not accurately represent the channel conditions of the entire region. As a result, the technology disclosed in Patent Document 1 may not be able to accurately determine the radio operation to be applied to the wireless terminal.

[0005] An object of the present disclosure is to provide a control device, a wireless terminal, a method, and a program that can accurately determine wireless operations to be applied to a wireless terminal. Note that this object is only one of multiple objects that multiple embodiments disclosed in this specification aim to achieve. Other objects or problems and novel features will become apparent from the description of this specification or the accompanying drawings. [Means for solving the problem]

[0006] The control device according to the present disclosure is a control device that controls at least one base station, and includes an area setting unit that divides at least one communication area of ​​the at least one base station into multiple subareas based on at least one of an index indicating wireless channel characteristics or the coverage areas of each of multiple beams of the at least one base station, and a decision unit that decides a communication operation to be applied to a target terminal based on information related to the subarea corresponding to the target terminal.

[0007] A first wireless terminal according to the present disclosure is a first wireless terminal that communicates with at least one base station, and includes an area setting unit that divides a movement path of the first wireless terminal into multiple subareas based on at least one of an indicator indicating wireless channel characteristics or the coverage areas of each of multiple beams of the at least one base station, and a decision unit that determines a communication operation to be applied to the first wireless terminal based on information related to the subarea corresponding to the first wireless terminal.

[0008] The method according to the present disclosure is a method executed by a control device that controls at least one base station, and includes dividing at least one communication area of ​​the at least one base station into multiple subareas based on at least one of an indicator indicating wireless channel characteristics or a coverage area of ​​each of multiple beams of the at least one base station, and determining a communication operation to be applied to a target terminal based on information related to the subarea corresponding to the target terminal.

[0009] The program of the present disclosure causes a control device that controls at least one base station to perform processing including dividing at least one communication area of ​​the at least one base station into multiple subareas based on at least one of an indicator indicating wireless channel characteristics or the coverage areas of each of multiple beams of the at least one base station, and determining a communication operation to be applied to a target terminal based on information related to the subarea corresponding to the target terminal. [Effects of the Invention]

[0010] The present disclosure makes it possible to provide a control device, a wireless terminal, a method, and a program that can accurately determine the wireless operation to be applied to the wireless terminal. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 illustrates an example of a wireless communication system according to the present disclosure. [Figure 2] FIG. 2 is a block diagram illustrating an example of a control device according to the present disclosure. [Figure 3] 10 is a flowchart illustrating an example of a processing operation of a control device according to the present disclosure. [Figure 4] FIG. 2 is a block diagram illustrating an example of a base station of the present disclosure. [Figure 5] FIG. 10 is a block diagram illustrating another example of a control device according to the present disclosure. [Figure 6] FIG. 2 is a block diagram illustrating an example of a control unit of the present disclosure. [Figure 7] FIG. 2 is a conceptual diagram of a channel measurement database of the present disclosure. [Figure 8] FIG. 10 is a diagram illustrating an example of an index indicating wireless channel characteristics according to the present disclosure. [Figure 9] FIG. 2 is a diagram illustrating an example of a method of dividing a communication area into a plurality of subareas according to the present disclosure. [Figure 10] 10A and 10B are diagrams illustrating an example of a method for determining a communication operation to be applied to a target terminal according to the present disclosure. [Figure 11] FIG. 1 is a block diagram illustrating an example of a wireless device according to the present disclosure. [Figure 12] 10 is a flowchart illustrating another example of the processing operation of the control device of the present disclosure. [Figure 13] FIG. 2 is a diagram illustrating a Doppler shift value according to the present disclosure. [Figure 14] FIG. 10 is a diagram illustrating another example of a method of dividing a communication area into a plurality of subareas according to the present disclosure. [Figure 15] FIG. 10 is a diagram illustrating another example of a method of dividing a communication area into a plurality of subareas according to the present disclosure. [Figure 16] FIG. 1 is a block diagram illustrating an example of a wireless terminal of the present disclosure. [Figure 17] FIG. 10 is a block diagram illustrating another example of a control device according to the present disclosure. [Figure 18] FIG. 10 is a block diagram illustrating another example of a base station and a wireless terminal according to the present disclosure. [Figure 19] FIG. 10 is a block diagram illustrating another example of a base station and a wireless terminal according to the present disclosure. [Figure 20] FIG. 10 is a block diagram illustrating another example of a base station and a wireless terminal according to the present disclosure. [Figure 21] FIG. 2 is a diagram illustrating an example of the configuration of a control device. [Figure 22] FIG. 2 is a diagram illustrating an example of the configuration of a wireless terminal. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments will be described with reference to the drawings. In this disclosure, the drawings may relate to one or more embodiments. Furthermore, each element in the drawings may apply to one or more embodiments. Furthermore, in the embodiments, identical or equivalent elements are given the same reference numerals, and redundant explanations will be omitted.

[0013] Each drawing is merely an example for describing one or more embodiments. Each drawing may relate not only to one particular embodiment, but also to one or more other embodiments. Various features or steps described with reference to any one drawing may be combined with features or steps shown in one or more other drawings, for example, to create an embodiment not explicitly shown or described. Not all features or steps shown in any one drawing are necessary to describe an exemplary embodiment, and some features or steps may be omitted. The order of steps described in any drawing may be changed as appropriate.

[0014] First Embodiment [Wireless communication system overview] FIG. 1 is a diagram illustrating an example of a wireless communication system according to the present disclosure. In FIG. 1, the wireless communication system 1 includes base stations 10-1 and 10-2 and a wireless terminal 20. The wireless communication system 1 may be, for example, a system conforming to the technical specifications of 3GPP (registered trademark) (Third Generation Partnership Project). Note that, hereinafter, when there is no need to distinguish between the base stations 10-1 and 10-2, each of the base stations 10-1 and 10-2, or the base stations 10-1 and 10-2, may be simply referred to as a base station 10. Also, while FIG. 1 illustrates two base stations 10 and one wireless terminal 20, the number of base stations 10 and the number of wireless terminals 20 are not limited to this.

[0015] A base station 10 provides one or more cells. The base station 10 communicates with wireless terminals 20 present in the cells. The base station 10 may be, for example, a base station or a base station element of a Radio Access Network (RAN). As shown in FIG. 1 , the base station 10 transmits control signals or data to the wireless terminals 20 on a downlink (DL). The base station 10 also receives control signals or data from the wireless terminals 20 on an uplink (UL). Both the base station 10 and the wireless terminals 20 are capable of transmitting and receiving signals by performing beamforming.

[0016] The wireless terminal 20 may be, for example, a mobile terminal such as a smartphone, a mobile phone, or a tablet, or a sensing device. The wireless terminal 20 may also be a relay device having a relay function. As shown in FIG. 1, the wireless terminal 20 receives control signals or data from the base station 10 via DL. The wireless terminal 20 also transmits control signals or data to the base station 10 via UL. This allows the wireless terminal 20 to use various wireless communication services provided by the wireless communication system. The wireless terminal 20 may also be, for example, a relay base station mounted on a train or a vehicle.

[0017] [Control device configuration example] 2 is a block diagram showing an example of a control device according to the present disclosure. In FIG. 2, the control device 5 includes an area setting unit 51 and a determination unit 52. The control device 5 is included in the base station 10 or the wireless terminal 20.

[0018] (When the control device is included in the base station) The area setting unit 51 divides at least one communication area of ​​the base station 10 into multiple subareas based on at least one of an index indicating wireless channel characteristics and the coverage areas of multiple beams of the base station 10. For example, the area setting unit 51 may repeatedly divide the communication area into multiple subareas at intervals of a predetermined time or longer. The at least one communication area of ​​the base station 10 may be, for example, a cell or a sector of the base station 10. Note that, when dividing the communication area based on both an index indicating wireless channel characteristics and the coverage areas of multiple beams of the base station 10, the at least one communication area of ​​the base station 10 may be divided into multiple subareas as follows. For example, the area setting unit 51 divides at least one communication area of ​​the base station 10 into multiple divided areas based on the index indicating wireless channel characteristics. Then, the area setting unit 51 divides each divided area into multiple subareas based on the coverage areas of multiple beams of the base station 10.

[0019] The determination unit 52 determines a communication operation to be applied to the target terminal based on information related to the subarea corresponding to the target terminal. The target terminal is the wireless terminal 20 for which the communication operation is to be determined. The "information related to the subarea corresponding to the target terminal" may be, for example, information on the type of the subarea in which the target terminal is located, an index indicating wireless channel characteristics in the subarea in which the target terminal is located, or information indicating a beam to which the target terminal is connected. The "index indicating wireless channel characteristics" may be, for example, the received power of a signal propagated through a wireless channel, the channel gain of the wireless channel, the path gain, the path loss, the signal-to-noise power ratio (SNR), or the signal-to-interference and noise power ratio (SINR). In this case, the "communication operation to be applied to the target terminal" may be, for example, transmission power control, wireless resource allocation, or connecting cell / beam selection. The "index indicating wireless channel characteristics" may be, for example, an index related to a radio frequency offset, an index related to the rate of time variation of a channel parameter, or an index related to radio wave propagation delay. In this case, the "communication operation to be applied to the target terminal" may be, for example, a process to correct a deviation in the radio frequency, a process to set a measurement period for the channel parameters, or a process to compensate for a propagation delay.

[0020] (When the control device is included in the wireless terminal) The area setting unit 51 divides the movement route of the wireless terminal 20 into a plurality of sub-areas based on at least one of an index indicating wireless channel characteristics and the coverage areas of the plurality of beams of the base station 10.

[0021] The determination unit 52 determines a communication operation to be applied to the wireless terminal 20 based on information related to the subarea corresponding to the wireless terminal 20. The "information related to the subarea corresponding to the wireless terminal 20" may be, for example, information on the type of the subarea in which the wireless terminal 20 is located, an index indicating wireless channel characteristics in the subarea in which the wireless terminal 20 is located, or information indicating a beam to which the wireless terminal 20 is connected. The "index indicating wireless channel characteristics" may be, for example, the received power of a signal propagated through a wireless channel, the channel gain of the wireless channel, the path gain, the path loss, the signal-to-noise power ratio (SNR), or the signal-to-interference and noise power ratio (SINR). In this case, the "communication operation to be applied to the wireless terminal 20" may be, for example, transmission power control, wireless resource allocation, or connecting cell / beam selection. The "index indicating wireless channel characteristics" may be, for example, an index related to a radio frequency offset, an index related to the rate of time variation of a channel parameter, or an index related to radio wave propagation delay. In this case, the "communication operation applied to the wireless terminal 20" may be, for example, a process for correcting a deviation in the radio frequency, a process for setting a measurement period for the channel parameters, or a process for compensating for a propagation delay.

[0022] [Example of control device operation] 3 is a flowchart showing an example of the processing operation of the control device of the present disclosure. The processing flow shown in FIG. 3 may be repeatedly executed at intervals of at least a predetermined time length.

[0023] (When the control device is included in the base station) The area setting unit 51 divides at least one communication area of ​​the base station 10 into multiple subareas based on at least one of an index indicating wireless channel characteristics and the coverage areas of each of multiple beams of the base station 10 (step S11).

[0024] The decision unit 52 decides the communication operation to be applied to the target terminal based on information related to the sub-area corresponding to the target terminal (step S12).

[0025] (When the control device is included in the wireless terminal) The area setting unit 51 divides the movement route of the wireless terminal 20 into a plurality of sub-areas based on at least one of an index indicating wireless channel characteristics and the coverage areas of the plurality of beams of the base station 10 (step S11).

[0026] The decision unit 52 decides a communication operation to be applied to the wireless terminal 20 based on information related to the subarea corresponding to the wireless terminal 20 (step S12).

[0027] As described above, according to the first embodiment, the area setting unit 51 in the control device 5 divides at least one communication area of ​​the base station 10 into a plurality of subareas based on at least one of an index indicating wireless channel characteristics and the coverage areas of a plurality of beams of the base station 10. The determination unit 52 determines a communication operation to be applied to a target terminal based on information related to the subarea corresponding to the target terminal.

[0028] This configuration of the control device 5 makes it possible to accurately determine the radio operation to be applied to the target terminal. That is, the index indicating the radio channel characteristics changes over time. Furthermore, since the multiple beams of the base station 10 are also adjusted by the base station 10, the coverage areas of the multiple beams of the base station 10 also change over time. The control device 5 can adjust the subarea based on parameters that change over time, and therefore can set a subarea that matches the situation at each timing. The control device 5 determines the communication operation to be applied to the target terminal based on information related to the subarea corresponding to the target terminal, and therefore can accurately determine the radio operation to be applied to the target terminal.

[0029] Second Embodiment The second to seventh embodiments correspond to the case where the above control device is included in a base station. The basic configuration of the wireless communication system of the second embodiment is the same as that of the wireless communication system 1, so FIG.

[0030] [Base station configuration example] FIG. 4 is a block diagram showing an example of a base station according to the present disclosure. In FIG. 4, the base station 10 includes a control device 11 and radio devices 12-1 and 12-2. Hereinafter, when there is no need to distinguish between the radio devices 12-1 and 12-2, each of the radio devices 12-1 and 12-2, or the radio devices 12-1 and 12-2, may be simply referred to as a radio device 12. In FIG. 4, the base station 10 includes two radio devices 12, but the number of radio devices 12 is not limited to this. That is, the base station 10 may include one radio device 12, or three or more radio devices 12. The control device 11 corresponds to the control device 5 described above.

[0031] The control device 11 may be, for example, a CU (Central Unit), a DU (Distributed Unit), a BBU (Baseband Unit), or a RIC (RAN Intelligent Controller). The control device 11 may also have a configuration including some of the functions of an RU.

[0032] 4, the control device 11 and the wireless device 12 are located in the same base station, but the control device 11 and the wireless device 12 may be located in physically separate locations. Also, multiple wireless devices 12 may be located in geographically dispersed locations.

[0033] The control device 11 is connected to a radio device 12 via a transmission path 13. The control device 11 is configured to communicate with one or more radio terminals 20 via the radio device 12.

[0034] The transmission path 13 may be an optical fiber, a metal cable, or a wireless propagation path. For example, a Radio over Fiber (RoF) technology may be applied between the control device 11 and the wireless device 12. In another example, a Common Public Radio Interface (CPRI) technology or an evolved CPRI (eCPRI) technology may be applied between the control device 11 and the wireless device 12.

[0035] [Control device configuration example] 5 is a block diagram showing another example of a control device according to the present disclosure. In FIG. 5, the control device 11 includes a transmission path interface 111, a control unit 112, and a storage unit 113.

[0036] The transmission line IF 111 is an interface for communicating with the radio device 12 via the transmission line 13 .

[0037] 6 is a block diagram showing an example of a control unit of the present disclosure. In FIG. 6, control unit 112 includes an acquisition unit 1121, an area setting unit 1122, and a determination unit 1123.

[0038] The acquisition unit 1121 acquires the above-mentioned "index indicating the wireless channel characteristics."

[0039] For example, the acquisition unit 1121 includes a database (DB) creation unit 1121A and an index acquisition unit 1121B.

[0040] The DB creation unit 1121A acquires channel measurement data between the base station 10 and the wireless terminal 20 (for example, information about the location of the wireless terminal 20 and channel parameter values ​​at that location). However, the acquired channel measurement data may be channel data of a wireless terminal (wireless terminal 20, another wireless terminal) that has previously communicated with the base station 10, or may be channel data acquired by simulation. The channel data of the wireless terminal may be measured based on an UL Reference Signal (RS) transmitted by the wireless terminal. The UL reference signal may be, for example, one or both of an SRS and a DMRS. The wireless terminal may measure the channel based on a DL RS transmitted by the base station 10 and report the measurement result to the base station 10 as channel data of the wireless terminal. The DL RS may be, for example, an SSB (SS / PBCH Block), a CSI-RS (Channel State Information Reference Signal), a DMRS (Demodulation Reference Signal), or a PT-RS (Phase Tracking Reference Signal). Specific examples of channel parameters will be described later.

[0041] The DB creation unit 1121A registers the acquired channel measurement data in a database. For example, the DB creation unit 1121A may register the acquired channel measurement data in the database for each wireless terminal type. For example, the channel measurement data may be labeled for each wireless terminal type and stored in the storage unit 113. The "wireless terminal type" may be determined based on, for example, the speed, movement route, movement direction, communication capabilities (including antenna configuration, transmission power, power class, etc.) of the wireless terminal, a unique number or unique name possessed by the terminal, etc.

[0042] FIG. 7 is a conceptual diagram of a channel measurement database according to the present disclosure. However, the example of FIG. 7 illustrates terminal types #1 and #2, which have different travel routes and travel directions. The terminal type #1 database and the terminal type #2 database may each be composed of channel measurement data from multiple wireless terminals determined to be of the same terminal type. When composed of channel measurement data from multiple wireless terminals, the channel measurement data for one terminal type may be, for example, an average of the channel measurement data from the multiple wireless terminals. FIG. 7 also illustrates a graph showing the channel power at each position along the travel route of terminal type #1. However, if the database for terminal type #1 includes multiple terminals, the channel power value may be the average of the channel power values ​​of some or all of the multiple terminals. In the example of FIG. 7, a channel database is created for the location of the wireless terminal, but the location may be replaced with an equivalent indicator as needed. For example, the horizontal axis of FIG. 7 may represent, but is not limited to, relative time based on the point at which the wireless terminal entered the communication area of ​​base station 10, or the angle of the wireless terminal measured from the antenna position of base station 10. When the position of the wireless terminal is used, for example, position information measured by the Global Positioning System (GPS) of the wireless terminal may be used. When the angle of the wireless terminal measured from the antenna position of the base station 10 is used, an angle estimated using various angle-of-arrival estimation techniques may be used.

[0043] The index acquisition unit 1121B calculates an index representing channel characteristics for each position coordinate point within the communication area of ​​the base station 10. However, the index acquisition unit 1121B does not necessarily need to calculate indices for a large number of coordinate points that cover the entire communication area of ​​the base station 10, and may calculate indices for coordinate points that partially cover the communication area. For example, in the example of FIG. 7, indices may be calculated for coordinate points on or near the movement path of each terminal type. Furthermore, the calculation of an index representing channel characteristics may be performed for each wireless terminal type. Hereinafter, the entire communication area covered by a base station may be referred to as the communication area of ​​the base station. A portion of the communication area of ​​the base station that is formed as an area on or near the movement path of terminal type #n may be referred to as the communication area of ​​terminal type #n. Furthermore, when there is no particular need to distinguish between the communication area of ​​the base station and the communication area of ​​terminal type #n, both may be simply referred to as the communication area.

[0044] For example, the index acquiring unit 1121B calculates an index representing the speed of time fluctuation of a channel parameter based on the channel parameters among the data registered in the database as an "index representing wireless channel characteristics." The channel parameter may be the received power of a signal propagated through the wireless channel (i.e., channel power), the channel gain of the wireless channel, the path gain, the path loss, the signal-to-noise power ratio, or the signal-to-interference-plus-noise power ratio. Here, as an example, a case will be described in which the index representing wireless channel characteristics is an index representing the speed of time fluctuation of channel power.

[0045] 8 is a diagram illustrating an example of an index indicating wireless channel characteristics according to the present disclosure. In the example shown in Fig. 8, a coefficient of variation expressed by the following equation (1) is used as an index indicating the speed of time fluctuation of channel power.

number

[0046] Fig. 8 shows the coefficients of variation for coordinate point #1, coordinate point #2, and coordinate point #3. The coefficients of variation are found by calculating the average u and standard deviation σ from the distribution of channel power data within the range of window size W centered on each coordinate point, and then calculating Equation 1. The example in Fig. 9 shows that the coefficients of variation are large at coordinate points #1 and #3, where the channel fluctuates significantly over time, and small at coordinate point #2, where the channel fluctuates relatively slowly over time.

[0047] The area setting unit 1122 divides the communication area of ​​the base station 10 into a plurality of subareas based on an index indicating the wireless channel characteristics.

[0048] FIG. 9 is a diagram illustrating an example of a method of dividing a communication area into multiple subareas according to the present disclosure. In FIG. 9, the communication area of ​​terminal type #1 is the communication area to be divided. The area setting unit 1122 divides the communication area of ​​terminal type #1 into multiple subareas using, for example, two thresholds Th1 and Th2 and an index indicating the rate of time variation of channel power at multiple points in the communication area of ​​terminal type #1. Specifically, the area setting unit 1122 classifies points having a rate of time variation of channel power equal to or greater than threshold Th1 as a "fast-varying area." Furthermore, the area setting unit 1122 classifies points having a rate of time variation of channel power less than threshold Th1 and equal to or greater than threshold Th2 as a "medium-varying area." Furthermore, the area setting unit 1122 classifies points having a rate of time variation of channel power less than threshold Th2 as a "slow-varying area."

[0049] The determination unit 1123 determines a communication operation to be applied to the target terminal based on information related to the subarea corresponding to the target terminal. Here, the information related to the subarea corresponding to the target terminal may be type information of the subarea in which the target terminal is located. Furthermore, the communication operation to be applied to the target terminal may be a communication operation performed by the base station 10, a communication operation performed by the target terminal, or both. When the determination unit 1123 determines a communication operation to be performed by the target terminal, the base station 10 may notify the target terminal of the communication operation determined by the determination unit 1123. Then, the target terminal may determine an operation related to communication of the communication terminal based on the notified information.

[0050] For example, when the target terminal is located in a slow fluctuation area, the determination unit 1123 may set the channel measurement period to 80 msec. Also, when the target terminal is located in a medium fluctuation area, the determination unit 1123 may set the channel measurement period to 40 msec. Also, when the target terminal is located in a fast fluctuation area, the determination unit 1123 may set the channel measurement period to 20 msec. Note that the location of the target terminal may be determined using, for example, location coordinates acquired from the GPS of the target terminal.

[0051] That is, as shown in Fig. 10, when the channel fluctuates significantly over time, the determination unit 1123 sets the channel measurement period to be short. This makes it possible to follow rapidly changing channel conditions. On the other hand, when the channel fluctuates slowly over time, the determination unit 1123 sets the channel measurement period to be long. This makes it possible to suppress unnecessary power consumption and an increase in signaling. Fig. 10 is a diagram illustrating an example of a method for determining a communication operation to be applied to a target terminal of the present disclosure.

[0052] [Example of wireless device configuration] Fig. 11 is a block diagram showing an example of a wireless device according to the present disclosure. In Fig. 11, the wireless device 12 includes a transmission path IF 121 and a wireless communication unit 122. The transmission path IF 121 is an interface for communicating with the control device 11 via a transmission path 13.

[0053] The wireless communication unit 122 is a component that performs wireless communication with the wireless terminal 20. For example, the wireless communication unit 122 includes an antenna, an RF (Radio Frequency) circuit, and the like. The wireless communication unit 122 transmits a radio frequency signal to the wireless terminal 20 during DL communication. The wireless communication unit 122 receives a radio frequency signal from the wireless terminal 20 during UL communication. The wireless communication unit 122 also includes one or more antenna elements. When the wireless communication unit 122 includes multiple antenna elements, the wireless communication unit 122 may have a fully digital configuration in which each antenna element is connected to a respective RF circuit, or may have a subarray configuration in which subarrays made up of multiple antenna elements share a single RF circuit. When the wireless communication unit 122 has a subarray configuration, each subarray may perform analog beamforming.

[0054] [Example of control device operation] Fig. 12 is a flowchart showing another example of the processing operation of the control device of the present disclosure. The processing flow shown in Fig. 12 may be repeatedly executed at intervals of at least a predetermined time length.

[0055] The acquisition unit 1121 acquires an index indicating the wireless channel characteristics (step S21).

[0056] The area setting unit 1122 divides the communication area of ​​the base station 10 into a plurality of subareas based on an index indicating the wireless channel characteristics (step S22).

[0057] The decision unit 1123 decides the communication operation to be applied to the target terminal based on the information related to the sub-area corresponding to the target terminal (step S23).

[0058] <Third embodiment> In the third embodiment, an index relating to a deviation in radio frequency is used as an index indicating radio channel characteristics. Note that the basic configurations of the wireless communication system, base station, and wireless terminal of the third embodiment are the same as those of the wireless communication system 1, base station 10, and wireless terminal 20, and therefore refer to Figures 1, 4-6, and 11.

[0059] In the third embodiment, the acquiring unit 1121 acquires an index relating to the deviation of the radio frequency as an "index indicating the radio channel characteristics."

[0060] For example, in the third embodiment, the DB creation unit 1121A acquires channel measurement data between the base station 10 and the wireless terminal 20 (for example, information about the position of the wireless terminal 20 and a Doppler shift value at that position). However, the acquired channel measurement data may be channel data of a wireless terminal (wireless terminal 20, another wireless terminal) that has previously communicated with the base station 10, or may be channel data acquired by simulation. Alternatively, the DB creation unit 1121A may acquire information about the position of the wireless terminal 20 and its velocity (speed and moving direction) at that position.

[0061] The DB creation unit 1121A registers the acquired channel measurement data in a database. For example, the DB creation unit 1121A may register the acquired channel measurement data in a database for each base station, each cell, each sector, or each beam. The DB creation unit 1121A may also register acquired information about the location of the wireless terminal 20 and its velocity (speed and moving direction) at that location in a database for each base station, each cell, each sector, or each beam.

[0062] The index acquiring unit 1121B acquires an index indicating unconnected channel characteristics for each position coordinate point within the communication area of ​​the base station 10. For example, if the database holds data on the Doppler shift between the wireless terminal and the base station, the index acquiring unit 1121B acquires a Doppler shift value for each position coordinate point within the communication area of ​​the base station 10. If the database does not hold data on the Doppler shift between the wireless terminal and the base station, the index acquiring unit 1121B acquires information on the position and the velocity (speed and direction of movement) at that position, and indirectly calculates the Doppler shift value based on the acquired information. That is, the index related to the radio frequency deviation is the Doppler shift value here. The Doppler shift value may be calculated for each base station, each cell, each sector, or each beam.

[0063] In the third embodiment, the area setting unit 1122 divides the communication area of ​​the base station 10 into multiple subareas based on an index indicating wireless channel characteristics (i.e., Doppler shift values). The area setting unit 1122 may divide the communication area of ​​the base station 10 into multiple subareas using, for example, two thresholds Th1 and Th2 and Doppler shift values ​​of multiple points in the communication area of ​​the base station 10. The area setting unit 1122 assigns points having Doppler shift values ​​whose absolute values ​​are equal to or greater than the threshold Th1 to a "high Doppler shift value area." The area setting unit 1122 also assigns points having Doppler shift values ​​whose absolute values ​​are less than the threshold Th1 and greater than or equal to the threshold Th2 to a "medium Doppler shift value area." The area setting unit 1122 also assigns points having Doppler shift values ​​whose absolute values ​​are less than the threshold Th2 to a "low Doppler shift value area."

[0064] In the third embodiment, the determination unit 1123 determines a communication operation to be applied to a target terminal based on information related to the subarea corresponding to the target terminal. Here, the information related to the subarea corresponding to the target terminal may be type information of the subarea in which the target terminal is located. Furthermore, the communication operation to be applied to the target terminal may be a communication operation performed by the base station 10, a communication operation performed by the target terminal, or both. Furthermore, the communication operation to be applied to the target terminal may be a communication operation during reception, a communication operation during transmission, or both.

[0065] For example, when the target terminal is located in a high Doppler shift value area, the determination unit 1123 may determine the frequency offset to be a first value. Then, frequency offset such as AFC (Automatic Frequency Control) may be performed using this first value. Furthermore, when the target terminal is located in a medium Doppler shift value area, the determination unit 1123 may determine the frequency offset to be a second value. Then, frequency offset may be performed using this second value. Furthermore, when the target terminal is located in a low Doppler shift value area, the determination unit 1123 may determine the frequency offset to be a third value. Then, frequency offset may be performed using this third value. Note that, for example, location coordinates acquired from the GPS of the target terminal may be used to determine the location of the target terminal.

[0066] FIG. 13 is a diagram illustrating the Doppler shift value of the present disclosure. In FIG. 13, when a wireless terminal is moving leftward and connected to beam #1 of base station 10-1, a negative Doppler shift occurs. On the other hand, when the wireless terminal is connected to beam #2 of base station 10-2, a positive Doppler shift occurs. When the wireless terminal switches its connection from beam #1 of base station 10-1 to beam #2 of base station 10-2, the Doppler shift experienced by the wireless terminal changes suddenly from −f′_D to +f_D. Such a sudden change in Doppler shift may degrade communication performance. That is, a sudden change in the Doppler shift value often occurs when switching base stations, cells, sectors, beams, etc., and in sections without switching, the Doppler shift value fluctuates relatively slowly. Therefore, the determination unit 1123 may determine to execute processing to correct the radio frequency deviation when a change in the base station, cell, sector, or beam to which the target terminal is connected is used as a trigger.

[0067] <Fourth embodiment> In the fourth embodiment, an index related to radio wave propagation delay is used as an index indicating wireless channel characteristics. Note that the basic configurations of the wireless communication system, base station, and wireless terminal of the fourth embodiment are the same as those of the wireless communication system 1, base station 10, and wireless terminal 20, so reference is made to Figures 1, 4-6, and 11.

[0068] In the fourth embodiment, the acquiring unit 1121 acquires an index relating to the propagation delay of radio waves as the "index indicating the wireless channel characteristics."

[0069] For example, in the fourth embodiment, the DB creating unit 1121A acquires channel measurement data between the base station 10 and the wireless terminal 20 (for example, information on the position of the wireless terminal 20 and the propagation delay value of the radio wave at that position).

[0070] The DB creation unit 1121A registers the acquired channel measurement data in the database. For example, the DB creation unit 1121A may register the acquired channel measurement data in the database for each base station, each cell, each sector, or each beam.

[0071] The index acquiring unit 1121B acquires an index indicating unconnected channel characteristics for each position coordinate point within the communication area of ​​the base station 10. For example, if data on the propagation delay of radio waves between a wireless terminal and a base station is stored in a database, the index acquiring unit 1121B acquires the propagation delay value of radio waves for each position coordinate point within the communication area of ​​the base station 10.

[0072] In the fourth embodiment, the area setting unit 1122 divides the communication area of ​​the base station 10 into multiple subareas based on an index indicating wireless channel characteristics (i.e., radio wave propagation delay values). The area setting unit 1122 may divide the communication area of ​​the base station 10 into multiple subareas using, for example, two thresholds Th1 and Th2 and radio wave propagation delay values ​​of multiple points in the communication area of ​​the base station 10. For example, the area setting unit 1122 assigns points having radio wave propagation delay values ​​equal to or greater than the threshold Th1 to a "high propagation delay value area." Furthermore, the area setting unit 1122 assigns points having propagation delay values ​​less than the threshold Th1 and equal to or greater than the threshold Th2 to a "medium propagation delay value area." Furthermore, the area setting unit 1122 assigns points having propagation delay values ​​less than the threshold Th2 to a "low propagation delay value area."

[0073] In the fourth embodiment, the determination unit 1123 determines a communication operation to be applied to a target terminal based on information related to the subarea corresponding to the target terminal. Here, the information related to the subarea corresponding to the target terminal may be type information of the subarea in which the target terminal is located. Furthermore, the communication operation to be applied to the target terminal may be a communication operation performed by the base station 10, a communication operation performed by the target terminal, or both. Furthermore, the communication operation to be applied to the target terminal may be a communication operation during reception, a communication operation during transmission, or both.

[0074] For example, when the target terminal is located in a high propagation delay value area, the determination unit 1123 may determine the transmission timing correction value to be a first value. Then, transmission timing correction such as TA (Timing Advance) technology may be performed using this first value. Furthermore, when the target terminal is located in a medium propagation delay value area, the determination unit 1123 may determine the transmission timing correction value to be a second value. Then, transmission timing correction may be performed using this second value. Furthermore, when the target terminal is located in a low propagation delay value area, the determination unit 1123 may determine the transmission timing correction value to be a third value. Then, transmission timing correction may be performed using this third value. Note that the location of the target terminal may be determined using, for example, location coordinates acquired from the GPS of the target terminal.

[0075] In the UL of a wireless communication system, Timing Advance technology is used to synchronize the reception timing when a base station receives signals transmitted by multiple wireless terminals. For example, in the UL of a wireless communication system using Orthogonal Frequency Division Multiplexing (OFDM), if multiple wireless terminals are orthogonalized by OFDM using OFDM, and the difference in reception timing at the base station due to path differences between the wireless terminals exceeds the OFDM cyclic prefix (CP) length, the orthogonality between the wireless terminals will be lost. This can result in serious inter-symbol interference.

[0076] Information related to TA for determining the transmission timing of a wireless terminal is notified from a base station to the wireless terminal via a random access response or a Media Access Control Element (MAC CE). This notification is performed at a period relatively longer than the slot length during communication. Therefore, if the propagation delay between the wireless terminal and the base station changes suddenly (for example, when the wireless terminal switches the wireless device, base station, beam, etc. to which it is connected), the propagation delay compensation by TA may not work properly, which may result in a loss of orthogonality between the wireless terminals. That is, sudden changes in the propagation delay value often occur when switching the base station, cell, sector, beam, etc., while in sections without switching, the propagation delay value fluctuates relatively slowly. Therefore, the determination unit 1123 may determine to execute a process for correcting the transmission timing when a change in the base station, cell, sector, or beam to which the target terminal is connected is used as a trigger.

[0077] Fifth Embodiment In the fifth embodiment, the channel gain of the wireless channel and the like are used as indicators of the wireless channel characteristics. Note that the basic configurations of the wireless communication system, base station, and wireless terminal of the fifth embodiment are the same as those of the wireless communication system 1, base station 10, and wireless terminal 20, so reference is made to Figures 1, 4-6, and 11.

[0078] In the fifth embodiment, the acquiring unit 1121 acquires an index indicating a wireless channel characteristic. The "index indicating a wireless channel characteristic" is, for example, a received power of a signal propagated through a wireless channel, a channel gain of the wireless channel, a path gain, a path loss, a signal to noise power ratio (SNR), or a signal to interference and noise power ratio (SINR).

[0079] For example, in the fifth embodiment, the DB creating unit 1121A acquires channel measurement data between the base station 10 and the wireless terminal 20 (for example, information on the location of the wireless terminal 20 and an index value indicating the wireless channel characteristics at that location).

[0080] The index acquisition unit 1121B acquires an index indicating the unconnected channel characteristics for each position coordinate point within the communication area of ​​the base station 10.

[0081] In the fifth embodiment, the area setting unit 1122 divides the communication area of ​​the base station 10 into multiple subareas based on an index (e.g., a channel gain value) indicating wireless channel characteristics. The area setting unit 1122 may divide the communication area of ​​the base station 10 into multiple subareas using, for example, two thresholds Th1 and Th2 and channel gain values ​​of multiple points in the communication area of ​​the base station 10. For example, the area setting unit 1122 assigns points having a channel gain value equal to or greater than the threshold Th1 to a "high channel gain value area." Furthermore, the area setting unit 1122 assigns points having a channel gain value less than the threshold Th1 and equal to or greater than the threshold Th2 to a "medium channel gain value area." Furthermore, the area setting unit 1122 assigns points having a channel gain value less than the threshold Th2 to a "low channel gain value area."

[0082] In the fifth embodiment, the determination unit 1123 determines a communication operation to be applied to a target terminal based on information related to the subarea corresponding to the target terminal. Here, the information related to the subarea corresponding to the target terminal may be type information of the subarea in which the target terminal is located. Furthermore, the communication operation to be applied to the target terminal may be a communication operation performed by the base station 10, a communication operation performed by the target terminal, or both. Furthermore, the communication operation to be applied to the target terminal may be a communication operation during reception, a communication operation during transmission, or both.

[0083] The communication operation applied to the target terminal may be one or any combination of the following: transmission power control (TPC) of the target terminal, radio resource allocation to the target terminal at the base station, selection of a modulation and coding scheme (MCS), or selection of a connecting base station, cell, or beam.

[0084] Sixth Embodiment In the sixth embodiment, the communication area of ​​the base station is divided into a plurality of subareas based on the configuration information of the base station. Note that the basic configurations of the wireless communication system, base station, and wireless terminal of the sixth embodiment are the same as those of the wireless communication system 1, base station 10, and wireless terminal 20, so refer to Figures 1, 4-6, and 11.

[0085] In the sixth embodiment, the acquisition unit 1121 acquires configuration information of the base station. The configuration information of the base station includes, for example, beam information of the base station (for example, information related to digital or analog beamforming of the base station).

[0086] The acquisition unit 1121 also acquires an "index indicating wireless channel characteristics." For example, the DB creation unit 1121A acquires channel measurement data between the base station 10 and the wireless terminal 20 (for example, information related to the location of the wireless terminal 20 and the channel parameter values ​​at that location). The DB creation unit 1121A registers the acquired channel measurement data in a database. The index acquisition unit 1121B calculates an index indicating channel characteristics for each location coordinate point within the communication area of ​​the base station 10.

[0087] In the sixth embodiment, the area setting unit 1122 divides the communication area of ​​the base station 10 into a plurality of subareas based on the configuration information of the base station. Here, the configuration information of the base station is beam information of the base station.

[0088] 14 and 15 are diagrams illustrating another example of a method of dividing a communication area into multiple subareas according to the present disclosure. In FIG. 14, the communication area for terminal type #1 is the communication area to be divided. The area setting unit 1122 divides the communication area into multiple subareas based on the coverage areas of the multiple beams of the base station 10. Specifically, the area setting unit 1122 divides the communication area into a coverage area corresponding to beam #1, a coverage area corresponding to beam #2, a coverage area corresponding to beam #3, and a coverage area corresponding to beam #4.

[0089] In the sixth embodiment, the determination unit 1123 may determine a communication operation to be applied to a target terminal corresponding to each subarea. For example, as shown in FIG. 15, the determination unit 1123 acquires channel parameter values ​​at a representative point of each subarea (e.g., the center point of the subarea). Then, the determination unit 1123 determines a communication operation to be applied to a target terminal corresponding to each subarea based on the acquired channel parameter values ​​of each subarea. In the example of FIG. 15, an SSB transmission period of 100 msec is set for the cover area corresponding to beam #3, whose variation coefficient value is 0.05. Furthermore, an SSB transmission period of 80 msec is set for the cover area corresponding to beam #1, whose variation coefficient value is 0.1. An SSB transmission period of 20 msec is set for the cover area corresponding to beam #4, whose variation coefficient value is 0.5. An SSB transmission period of 10 msec is set for the cover area corresponding to beam #1, whose variation coefficient value is 0.6.

[0090] Then, the determination unit 1123 determines a communication operation to be applied to the target terminal based on information related to the subarea corresponding to the target terminal. Here, the information related to the subarea corresponding to the target terminal may be type information of the subarea in which the target terminal is located. Furthermore, the communication operation to be applied to the target terminal may be a communication operation performed by the base station 10, a communication operation performed by the target terminal, or both. When the determination unit 1123 determines the communication operation to be performed by the target terminal, the base station 10 may notify the target terminal of the communication operation determined by the determination unit 1123. Then, the target terminal may determine an operation related to communication of the communication terminal based on the notified information.

[0091] Here, it is assumed that the timing or position of beam switching for different wireless terminals is different from one another. In this case, multiple subareas including multiple wireless terminals are allowed to partially overlap with one another. When determining the communication operation of a target terminal, if the target terminal is located in multiple subareas (i.e., if the target terminal is located in an overlapping area of ​​two subareas), the determination unit 1123 can identify the subarea corresponding to the target terminal, for example, based on the connection beam information of the target terminal.

[0092] Seventh Embodiment Some or all of the functions of the area setting units 51 and 1122, the determination units 52 and 1123, and the index acquisition unit 1121B described in the first to sixth embodiments may be performed by inference using a trained Machine Learning (ML) model. Training of the ML model may be performed by the control devices 5 and 11, or may be performed by other network elements, such as a Near-Real Time (RT) RAN Intelligent Controller (RIC) or a Non-RT RIC. The area setting units 51 and 1122, the determination units 52 and 1123, and the index acquisition unit 1121B may operate as ML model inference hosts, and other network elements, such as a Near-RT RIC or a Non-RT RIC, may operate as ML model training hosts.

[0093] In one implementation, the database is used as input data for a trained ML model, which may then output, as an inference result, an index representing the channel characteristics at each coordinate point in the communication area.

[0094] In one implementation, the database and information about the target terminal (e.g., channel state information, location information, terminal type, etc.) are used as input data to a trained ML model. The trained ML model may then output, as an inference result, a decision result on an operation related to communication with the target terminal.

[0095] In one implementation, the index calculated by the index acquisition unit 1121B and information about the target terminal are used as input data for the trained ML model. The trained ML model may then output, as an inference result, a decision result on an operation related to communication with the target terminal.

[0096] Eighth Embodiment The eighth embodiment corresponds to the case where the control device is included in the wireless terminal. The basic configuration of the wireless communication system of the eighth embodiment is the same as that of the wireless communication system 1, so FIG.

[0097] [Wireless terminal configuration example] 16 is a block diagram showing an example of a wireless terminal according to the present disclosure. In FIG. 16, a wireless terminal 20 includes a wireless communication unit 21, a control unit (control device) 22, and a storage unit 23. The wireless communication unit 21 is an element that performs wireless communication with the wireless device 12. For example, the wireless communication unit 21 includes an antenna, an RF circuit, and the like.

[0098] The control device 22 corresponds to the above-mentioned control device 5. Fig. 17 is a block diagram showing another example of a control device of the present disclosure.

[0099] In FIG. 17, the control device 22 includes an acquisition unit 221, an area setting unit 222, and a determination unit 223.

[0100] The acquisition unit 221 acquires an "index indicating wireless channel characteristics."

[0101] For example, the acquisition unit 221 includes a DB creation unit 221A and an index acquisition unit 221B.

[0102] The DB creation unit 221A acquires channel measurement data between the base station 10 and the wireless terminal 20 (for example, information related to the location of the wireless terminal 20 and channel parameter values ​​at that location). However, the acquired channel measurement data may be channel data measured by the wireless terminal 20 between the base station and a base station with which the wireless terminal 20 currently or previously communicated, or may be channel data measured by simulation. The channel data may be measured by receiving a DL RS transmitted by a base station. The DL RS may be, for example, SSB, CSI-RS, DMRS, or PT-RS. Furthermore, the channel data may include the influence of inherent deviations resulting from the hardware design of the transmission and reception system, including the high-frequency circuitry of the wireless terminal 20. In this embodiment, the channel data is measured by the wireless terminal 20 itself and stored in the database. Therefore, it is possible to store in the database channel measurement data that is not reported to the base station.

[0103] The DB creation unit 1121A registers the acquired channel measurement data in the database.

[0104] The index acquisition unit 221B calculates an index representing a channel characteristic for each position coordinate point on the movement route of the wireless terminal 20. As a method for acquiring and calculating the index representing the channel characteristic, any of the methods described in the second to seventh embodiments can be used.

[0105] The area setting unit 222 divides the movement route of the wireless terminal 20 into a plurality of subareas based on an index indicating wireless channel characteristics or the coverage areas of each of a plurality of beams of the base station 10. As a method for dividing the movement route into a plurality of subareas, any of the methods described in the second to seventh embodiments can be used.

[0106] The determination unit 223 determines a communication operation to be applied to the radio terminal 20 based on information related to the subarea corresponding to the radio terminal 20. As a method for determining a communication operation to be applied to the radio terminal 20, any of the methods described in the second to seventh embodiments can be used. For example, the communication operation to be applied to the radio terminal 20 may be, for example, a change in the channel measurement or report period, or a trigger for reporting a channel measurement result that is not dependent on the period. Furthermore, the communication operation to be applied to the radio terminal 20 may be an operation related to frequency correction such as AFC, compensation for propagation delay such as TA, transmit power control, or connecting cell beam selection.

[0107] Ninth Embodiment Some or all of the functions of the area setting units 51 and 222, the determination units 52 and 223, and the index acquisition unit 221B described in the first and eighth embodiments may be performed by inference using a trained ML model. Training of the ML model may be performed by the control unit 22 of the wireless terminal 20. The control unit 22 operates as an ML model inference host.

[0108] In one implementation, the database is used as input data for a trained ML model, which may then output, as an inference result, an index representing channel characteristics at each coordinate point on the movement path of the wireless terminal 20.

[0109] In addition, in one implementation, the above database and information about the wireless terminal 20 (e.g., channel state information, location information, terminal type, etc.) are used as input data to a trained ML model. The trained ML model may then output, as an inference result, a decision result on an operation related to communication of the wireless terminal 20.

[0110] In addition, in one implementation, the above database and information about the wireless terminal 20 (e.g., channel state information, location information, terminal type, etc.) are used as input data to a trained ML model. The trained ML model may then output, as an inference result, a decision result on an operation related to communication of the wireless terminal 20.

[0111] Tenth Embodiment The tenth embodiment relates to an embodiment in which a base station control device and a wireless terminal control device cooperate with each other. The basic configuration of the wireless communication system of the tenth embodiment is the same as that of the wireless communication system 1, so FIG.

[0112] Fig. 18 is a block diagram showing another example of a base station and a wireless terminal according to the present disclosure. As shown in Fig. 18, the basic configurations of the base station and the wireless terminal according to the tenth embodiment are the same as the configurations of the base station 10 and the wireless terminal 20 described in the second to ninth embodiments.

[0113] In the tenth embodiment, the determination unit 1123 of the control device 11 (base station 10) notifies the target terminal of information regarding a communication operation to be performed by the target terminal among one or more communication operations to be applied to the target terminal determined by the determination unit 1123. Note that the communication operation to be performed by the base station 10 among one or more communication operations to be applied to the target terminal determined by the determination unit 1123 is executed in the base station 10.

[0114] In the tenth embodiment, the determination unit 223 of the control device 22 (wireless terminal 20) may determine the communication operation to actually be applied to the wireless terminal 20 using either or both of the communication operation to be performed by the target terminal indicated by the information notified from the determination unit 1123 and the communication operation to be applied to the wireless terminal 20 determined by the determination unit 223.

[0115] For example, among the operations related to the communication of the wireless terminal 20, the operations that can be determined by the determination unit 223 of the wireless terminal 20 may be determined based on the determination result of the determination unit 223. And, among the operations related to the communication of the wireless terminal 20, the operations that cannot be determined by the determination unit 223 of the wireless terminal 20 may instead be determined based on the determination result determined and notified by the determination unit 1123 of the base station 10.

[0116] When each process is performed only by the base station, a database containing channel data of multiple wireless terminals can be used. On the other hand, the base station cannot use channel data measured by the wireless terminal that is not reported to the base station. This makes it difficult for the base station to determine communication operations specific to each target terminal. On the other hand, when each process is performed by the wireless terminal, although the wireless terminal can use data that is not reported to the base station, it is difficult for the wireless terminal to use data obtained from other wireless terminals.

[0117] According to this embodiment, database creation, index calculation, area setting, and communication operation determination are performed by both the base station and the wireless terminal, thereby providing the advantages of both the above-mentioned cases where each process is performed by the base station and the wireless terminal.

[0118] Eleventh Embodiment The eleventh embodiment relates to another embodiment in which a base station control device and a wireless terminal control device cooperate with each other. The basic configuration of the wireless communication system of the eleventh embodiment is the same as that of the wireless communication system 1, so FIG.

[0119] Fig. 19 is a block diagram showing another example of a base station and a wireless terminal according to the present disclosure. As shown in Fig. 19, the basic configurations of the base station and the wireless terminal according to the eleventh embodiment are the same as the configurations of the base station 10 and the wireless terminal 20 described in the second to ninth embodiments.

[0120] In the eleventh embodiment, the index acquisition unit 1121B of the control device 11 (base station 10) notifies the wireless terminal 20 of information regarding an index that the wireless terminal 20 can use to set a subarea, from among one or more indexes representing channel characteristics calculated by the index acquisition unit 1121B.

[0121] In the tenth embodiment, the area setting unit 222 of the control device 22 (wireless terminal 20) divides the movement route of the wireless terminal 20 into multiple sub-areas using either or both of the index indicated by the information notified from the determination unit 1123 and the index calculated by the index acquisition unit 221B.

[0122] Then, the determination unit 223 determines the communication operation to be applied to the wireless terminal 20 based on information related to the subarea corresponding to the wireless terminal 20 .

[0123] <Twelfth embodiment> The twelfth embodiment relates to another embodiment in which a base station control device and a wireless terminal control device cooperate with each other. The basic configuration of the wireless communication system of the twelfth embodiment is the same as that of the wireless communication system 1, so FIG.

[0124] Fig. 20 is a block diagram showing another example of a base station and a wireless terminal according to the present disclosure. In Fig. 20, the control device 11 of the base station 10 has a control unit 112. The control unit 112 has an acquisition unit 1121. The acquisition unit 1121 has a DB creation unit 1121A and a model creation unit 1121C.

[0125] The model creation unit 1121C creates one or more trained index calculation models by training one or more index calculation models using the database created by the DB creation unit 1121A. The model creation unit 1121C notifies the wireless terminal 20 of information related to a model for performing inference in the wireless terminal 20, from among the one or more trained index calculation models created. In one implementation, the notified information may be one or more parameters included in the index calculation model. In another implementation, the notified information may be alternative information that enables the wireless terminal 20 to reproduce or approximately reproduce the index calculation model. For example, if the wireless terminal 20 holds multiple candidate inference models, the alternative information may be an index or the like for selecting a model to use from the candidate inference models.

[0126] In the twelfth embodiment, the index acquisition unit 221B of the control device 22 (wireless terminal 20) creates an index calculation model using information notified from the model creation unit 1121C. Then, the index acquisition unit 221B uses the created index calculation model to output an index representing the wireless channel characteristics.

[0127] In the twelfth embodiment, the area setting unit 222 divides the movement route of the wireless terminal 20 into a plurality of sub-areas based on an index indicating the wireless channel characteristics.

[0128] In the twelfth embodiment, the determination unit 223 determines the communication operation to be applied to the wireless terminal 20 based on information related to the subarea corresponding to the wireless terminal 20 .

[0129] <Other embodiments> <1> FIG. 21 is a diagram illustrating an example configuration of a control device. In FIG. 21, the control device 100 includes a processor 101 and a memory 102. The processor 101 may include, for example, one or more of a central processing unit (CPU), a micro processing unit (MPU), a field programmable gate array (FPGA), and an application specific integrated circuit (ASIC). The processor 101 may include multiple processors. The memory 102 is configured by a combination of a volatile memory and a nonvolatile memory. The volatile memory may include, for example, a random access memory (RAM). The nonvolatile memory may include, for example, one or more of a read only memory (ROM), a hard disk drive (HDD), and a solid state drive (SSD). The memory 102 may include storage located remotely from the processor 101. In this case, the processor 101 may access the memory 102 via an input / output (I / O) interface (not shown).

[0130] The control devices 5 and 11 of the first to seventh embodiments and the tenth to twelfth embodiments may each have the configuration shown in FIG. 19 . The area setting unit 51, the determination unit 52, and the control unit 112 of the control devices 5 and 11 of the first to seventh embodiments and the tenth to twelfth embodiments may be realized by the processor 101 reading and executing a program stored in the memory 102. That is, the control devices 5 and 11 of the first to seventh embodiments and the tenth to twelfth embodiments can be realized by software. The storage unit 113 is realized by the memory 102. The program can be stored using various types of non-transitory computer-readable media and supplied to the control devices 5 and 11. Examples of non-transitory computer-readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives) and magneto-optical recording media (e.g., magneto-optical disks). Further examples of non-transitory computer-readable media include CD-ROM (Read Only Memory), CD-R, and CD-R / W. Further examples of non-transitory computer-readable media include semiconductor memory. Semiconductor memory includes, for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, and RAM (Random Access Memory). The program may also be provided to the control device 5, 11 by various types of transitory computer-readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer-readable medium can provide the program to the control device 5, 11 via a wired communication path such as an electric wire or optical fiber, or via a wireless communication path.

[0131] Alternatively, the area setting unit 51, the determination unit 52, and the control unit 112 of the control devices 5 and 11 of the first to seventh embodiments and the tenth to twelfth embodiments may each be realized by dedicated hardware. Also, some or all of the components of each device may be realized by general-purpose or dedicated circuitry, processors, etc., or a combination thereof.

[0132] <2> FIG. 22 is a diagram illustrating an example configuration of a wireless terminal. In FIG. 22, the wireless terminal 200 includes a processor 201, a memory 202, and a radio circuit 203. The processor 201 may include, for example, one or more of a central processing unit (CPU), a micro processing unit (MPU), a field programmable gate array (FPGA), and an application specific integrated circuit (ASIC). The processor 201 may include multiple processors. The memory 202 is configured by a combination of a volatile memory and a nonvolatile memory. The volatile memory may include, for example, a random access memory (RAM). The nonvolatile memory may include, for example, one or more of a read only memory (ROM), a hard disk drive (HDD), and a solid state drive (SSD). The memory 202 may include storage located remotely from the processor 101. In this case, the processor 201 may access the memory 202 via an input / output (I / O) interface (not shown). The radio circuit 203 includes an antenna.

[0133] The wireless terminals 20 of the first embodiment and the eighth to twelfth embodiments may each have the configuration shown in FIG. 20 . The area setting unit 51, the determination unit 52, and the control unit 22 of the wireless terminals 20 of the first embodiment and the eighth to twelfth embodiments may be realized by the processor 201 reading and executing programs stored in the memory 202. That is, the wireless terminals 20 of the first embodiment and the eighth to twelfth embodiments can be realized by software. The storage unit 23 is realized by the memory 202. The wireless communication unit 21 is realized by the wireless circuit 203. The programs can be stored using various types of non-transitory computer-readable media and supplied to the wireless terminal 20. Examples of non-transitory computer-readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives) and magneto-optical recording media (e.g., magneto-optical disks). Further examples of non-transitory computer-readable media include CD-ROMs (Read Only Memory), CD-Rs, and CD-R / Ws. Further, examples of non-transitory computer-readable media include semiconductor memories. Semiconductor memories include, for example, mask ROM, programmable ROM (PROM), erasable PROM (EPROM), flash ROM, and random access memory (RAM). The program may also be provided to the wireless terminal 20 by various types of transitory computer-readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer-readable media can provide the program to the wireless terminal 20 via a wired communication path such as an electrical wire or optical fiber, or via a wireless communication path.

[0134] Alternatively, the area setting unit 51, the determination unit 52, and the control unit 22 of the wireless terminal 20 of the first embodiment and the eighth to twelfth embodiments may each be realized by dedicated hardware. Also, some or all of the components of each device may be realized by general-purpose or dedicated circuitry, processors, etc., or a combination thereof.

[0135] Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the invention. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0136] Each drawing is merely an example for describing one or more embodiments. Each drawing may relate not only to one particular embodiment, but also to one or more other embodiments. As will be understood by those skilled in the art, various features or steps described with reference to any one drawing can be combined with features or steps shown in one or more other drawings to create, for example, an embodiment not explicitly shown or described. Not all features or steps shown in any one drawing are necessary to describe an exemplary embodiment, and some features or steps may be omitted. The order of steps described in any drawing may be changed as appropriate.

[0137] A part or all of the above-described embodiments can be described as, but not limited to, the following supplementary notes. (Appendix 1) A control device that controls at least one base station, an area setting unit that divides at least one communication area of ​​the at least one base station into a plurality of subareas based on at least one of an index indicating wireless channel characteristics and a coverage area of ​​each of a plurality of beams of the at least one base station; a determination unit that determines a communication operation to be applied to a target terminal based on information related to a sub-area corresponding to the target terminal; A control device comprising: (Appendix 2) When the area setting unit divides at least one communication area of ​​the at least one base station into the plurality of subareas based on the index indicating the wireless channel characteristics, the information related to the subarea corresponding to the target terminal is type information of the subarea in which the target terminal is located; The determination unit determines a communication operation associated with the sub-area type information as a communication operation to be applied to the target terminal. 10. The control device of claim 1. (Appendix 3) When the area setting unit divides at least one communication area of ​​the at least one base station into the plurality of subareas based on the coverage areas of each of a plurality of beams of the at least one base station, the information related to the subarea corresponding to the target terminal is an index indicating the wireless channel characteristics in the subarea where the target terminal is located; the determination unit determines a communication operation to be applied to the target terminal based on an index indicating the wireless channel characteristics in the subarea in which the target terminal is located. 10. The control device of claim 1. (Appendix 4) The index indicating the wireless channel characteristics is a received power of a signal propagated through a wireless channel, a channel gain of the wireless channel, a path gain, a path loss, a signal-to-noise power ratio, or a signal-to-interference-and-noise power ratio, The communication operation applied to the target terminal is either transmission power control, radio resource allocation, or connection cell beam selection; 4. The control device according to claim 2 or 3. (Appendix 5) When the area setting unit divides at least one communication area of ​​the at least one base station into the plurality of subareas based on respective cover areas of a plurality of beams of the at least one base station, the information related to the subarea corresponding to the target terminal is information indicating a beam to which the target terminal is connected, The determination unit determines a communication operation associated with a beam to which the target terminal is connected as a communication operation to be applied to the target terminal. 10. The control device of claim 1. (Appendix 6) the indicator indicating the wireless channel characteristics is an indicator related to a deviation of a wireless frequency during wireless communication between the wireless terminal and the at least one base station, the area setting unit divides at least one communication area of ​​the at least one base station into a plurality of subareas according to a level of the index related to the radio frequency deviation; the determination unit determines to execute processing to correct a deviation of the radio frequency in accordance with a level of an index related to a deviation of the radio frequency corresponding to the subarea corresponding to the target terminal. 10. The control device of claim 1. (Appendix 7) the indicator indicating the wireless channel characteristics is an indicator related to a deviation of a wireless frequency during wireless communication between the wireless terminal and the at least one base station, the determination unit determines to execute a process of correcting a deviation of the radio frequency when a change in the base station, cell, sector, or beam to which the target terminal is connected is triggered. 10. The control device of claim 1. (Appendix 8) the index indicating the wireless channel characteristics is an index relating to a rate of time variation of a channel parameter during wireless communication between the wireless terminal and the at least one base station, the area setting unit divides at least one communication area of ​​the at least one base station into a plurality of subareas according to a level of an index related to a speed of time variation of the channel parameter; the determination unit determines a measurement period of the channel parameter according to a level of an index related to a speed of time variation of the channel parameter corresponding to the subarea corresponding to the target terminal. 10. The control device of claim 1. (Appendix 9) the index indicating the wireless channel characteristics is an index related to a propagation delay of radio waves during wireless communication between the wireless terminal and the at least one base station, the area setting unit divides at least one communication area of ​​the at least one base station into a plurality of subareas according to a level of the index related to the propagation delay of the radio wave; the determination unit determines to execute a process of compensating for the propagation delay in accordance with a level of an index related to the propagation delay of the radio wave corresponding to the subarea corresponding to the target terminal. 10. The control device of claim 1. (Appendix 10) the index indicating the wireless channel characteristics is an index related to a propagation delay of radio waves during wireless communication between the wireless terminal and the at least one base station, the determination unit determines to execute a process of compensating for the propagation delay when a change in a base station, a cell, a sector, or a beam to which the target terminal is connected is triggered. 10. The control device of claim 1. (Appendix 11) the area setting unit sets the plurality of sub-areas for each type of wireless terminal; the determination unit determines a communication operation to be applied to the target terminal based on information related to a subarea in which the target terminal is located and corresponds to a type of the target terminal; 10. The control device of claim 1. (Appendix 12) The type of the wireless terminal is determined based on the location or movement information of the wireless terminal. 12. The control device of claim 11. (Appendix 13) The type of the wireless terminal is determined based on the device configuration of the wireless terminal. 12. The control device of claim 11. (Appendix 14) The type of the wireless terminal is determined based on the capabilities of the wireless terminal. 12. The control device of claim 11. (Appendix 15) a first wireless terminal in communication with at least one base station, an area setting unit that divides a movement route of the first wireless terminal into a plurality of sub-areas based on at least one of an index indicating wireless channel characteristics and a coverage area of ​​each of a plurality of beams of the at least one base station; a decision unit that decides a communication operation to be applied to the first wireless terminal based on information related to a subarea corresponding to the first wireless terminal; A first wireless terminal comprising: (Appendix 16) When the area setting unit divides a movement route of the first wireless terminal into the plurality of subareas based on the index indicating the wireless channel characteristics, the information related to the subarea corresponding to the first wireless terminal is type information of the subarea in which the first wireless terminal is located, the determination unit determines a communication operation associated with the subarea type information as a communication operation to be applied to the first wireless terminal. 16. The first wireless terminal of claim 15. (Appendix 17) when the area setting unit divides a movement path of the first wireless terminal into the plurality of subareas based on respective coverage areas of a plurality of beams of the at least one base station, the information related to the subarea corresponding to the first wireless terminal is an index indicating the wireless channel characteristics in the subarea where the first wireless terminal is located; the determination unit determines a communication operation to be applied to the first wireless terminal based on an index indicating the wireless channel characteristics in the subarea where the first wireless terminal is located. 16. The first wireless terminal of claim 15. (Appendix 18) The index indicating the wireless channel characteristics is a received power of a signal propagated through a wireless channel, a channel gain of the wireless channel, a path gain, a path loss, a signal-to-noise power ratio, or a signal-to-interference-and-noise power ratio, The communication operation applied to the first radio terminal is any one of transmission power control, radio resource allocation, or serving cell beam selection. 18. The first wireless terminal of claim 16 or 17. (Appendix 19) When the area setting unit divides a movement path of the first wireless terminal into the plurality of subareas based on respective coverage areas of a plurality of beams of the at least one base station, the information related to the subarea corresponding to the first wireless terminal is information indicating a beam to which the first wireless terminal is connected, the determination unit determines a communication operation associated with a beam to which the first wireless terminal is connected as a communication operation to be applied to the first wireless terminal; 16. The first wireless terminal of claim 15. (Appendix 20) the indicator indicating the wireless channel characteristics is an indicator related to a deviation of a wireless frequency during wireless communication between the wireless terminal and the at least one base station, the area setting unit divides at least one communication area of ​​the at least one base station into a plurality of subareas according to a level of the index related to the radio frequency deviation; the determination unit determines to execute a process of correcting a deviation of the radio frequency according to a level of an index related to a deviation of the radio frequency corresponding to the subarea corresponding to the first wireless terminal. 16. The first wireless terminal of claim 15. (Appendix 21) the indicator indicating the wireless channel characteristics is an indicator related to a deviation of a wireless frequency during wireless communication between the wireless terminal and the at least one base station, the determination unit determines to execute a process of correcting a deviation of the radio frequency when a change in a base station, a cell, a sector, or a beam to which the first radio terminal is connected is used as a trigger. 16. The first wireless terminal of claim 15. (Appendix 22) the index indicating the wireless channel characteristics is an index relating to a rate of time variation of a channel parameter during wireless communication between the wireless terminal and the at least one base station, the area setting unit divides at least one communication area of ​​the at least one base station into a plurality of subareas according to a level of an index related to a speed of time variation of the channel parameter; the determination unit determines a measurement period of the channel parameter according to a level of an index related to a speed of time variation of the channel parameter corresponding to the subarea corresponding to the first wireless terminal. 16. The first wireless terminal of claim 15. (Appendix 23) the index indicating the wireless channel characteristics is an index related to a propagation delay of radio waves during wireless communication between the wireless terminal and the at least one base station, the area setting unit divides at least one communication area of ​​the at least one base station into a plurality of subareas according to a level of the index related to the propagation delay of the radio wave; the determination unit determines to execute a process of compensating for the propagation delay in accordance with a level of an index related to the propagation delay of the radio wave corresponding to the subarea corresponding to the first wireless terminal. 16. The first wireless terminal of claim 15. (Appendix 24) the index indicating the wireless channel characteristics is an index related to a propagation delay of radio waves during wireless communication between the wireless terminal and the at least one base station, the determination unit determines to execute a process of compensating for the propagation delay when a change in a base station, a cell, a sector, or a beam to which the first wireless terminal is connected is used as a trigger. 16. The first wireless terminal of claim 15. (Appendix 25) 1. A method executed by a controller controlling at least one base station, comprising: Dividing at least one communication area of ​​the at least one base station into a plurality of subareas based on at least one of an indicator of wireless channel characteristics or a coverage area of ​​each of a plurality of beams of the at least one base station; determining a communication action to apply to the target terminal based on information related to the sub-area corresponding to the target terminal; A method comprising: (Appendix 26) A control device that controls at least one base station, Dividing at least one communication area of ​​the at least one base station into a plurality of subareas based on at least one of an indicator of wireless channel characteristics or a coverage area of ​​each of a plurality of beams of the at least one base station; determining a communication action to apply to the target terminal based on information related to the sub-area corresponding to the target terminal; A program that executes a process, including: (Appendix 27) 1. A method performed by a first wireless terminal communicating with at least one base station, comprising: Dividing a movement path of the first wireless terminal into a plurality of subareas based on at least one of an indicator indicating wireless channel characteristics and a coverage area of ​​each of a plurality of beams of the at least one base station; determining a communication action to apply to the first wireless terminal based on information related to a subarea corresponding to the first wireless terminal; A method comprising: (Appendix 28) a first wireless terminal communicating with at least one base station; Dividing a movement path of the first wireless terminal into a plurality of subareas based on at least one of an indicator indicating wireless channel characteristics and a coverage area of ​​each of a plurality of beams of the at least one base station; determining a communication action to apply to the first wireless terminal based on information related to a subarea corresponding to the first wireless terminal; A program that executes a process, including:

[0138] Some or all of the elements (e.g., configurations and functions) described in Appendix 2 to Appendix 14 that are dependent on Appendix 1 {e.g., device} may also be dependent on Appendix 25 {e.g., method} and Appendix 26 {e.g., program} in the same dependency relationship as Appendix 2 to Appendix 14. Also, some or all of the elements (e.g., configurations and functions) described in Appendix 16 to Appendix 24 that are dependent on Appendix 15 {e.g., device} may also be dependent on Appendix 27 {e.g., method} and Appendix 28 {e.g., program} in the same dependency relationship as Appendix 16 to Appendix 24. Some or all of the elements described in any appendix may be applied to various hardware, software, recording means for recording software, systems, and methods. [Explanation of symbols]

[0139] 1. Wireless communication systems 5. Control device 10 base station 11 Control device 12 Radio equipment 13 Transmission Line 20 Wireless terminal 21 Radio Communication Department 22 Control unit (control device) 23 Memory section 51 Area setting section 52 Decision Section 111 Transmission Line Interface 112 Control Unit 113 Storage section 121 Transmission Line Interface 122 Radio Communication Department 221 Acquisition Department 221A Creation Department 221B Index acquisition part 222 Area setting section 223 Decision Section 1121 Acquisition Department 1121A Creation Department 1121B Index acquisition part 1121C Model Creation Department 1122 Area setting section 1123 Decision Section

Claims

1. A control device that controls at least one base station, an area setting unit that divides at least one communication area of ​​the at least one base station into a plurality of subareas based on at least one of an index indicating wireless channel characteristics and a coverage area of ​​each of a plurality of beams of the at least one base station; a determination unit that determines a communication operation to be applied to a target terminal based on information related to a sub-area corresponding to the target terminal; A control device comprising:

2. When the area setting unit divides at least one communication area of ​​the at least one base station into the plurality of subareas based on the index indicating the wireless channel characteristics, the information related to the subarea corresponding to the target terminal is type information of the subarea in which the target terminal is located, The determination unit determines a communication operation associated with the sub-area type information as a communication operation to be applied to the target terminal. The control device according to claim 1 .

3. When the area setting unit divides at least one communication area of ​​the at least one base station into the plurality of subareas based on coverage areas of each of a plurality of beams of the at least one base station, the information related to the subarea corresponding to the target terminal is an index indicating the wireless channel characteristics in the subarea where the target terminal is located; the determination unit determines a communication operation to be applied to the target terminal based on an index indicating the wireless channel characteristics in the subarea in which the target terminal is located. The control device according to claim 1 .

4. When the area setting unit divides at least one communication area of ​​the at least one base station into the plurality of subareas based on respective coverage areas of a plurality of beams of the at least one base station, the information related to the subarea corresponding to the target terminal is information indicating a beam to which the target terminal is connected, The determination unit determines a communication operation associated with a beam to which the target terminal is connected as a communication operation to be applied to the target terminal. The control device according to claim 1 .

5. the indicator indicating the wireless channel characteristics is an indicator related to a deviation of a wireless frequency during wireless communication between the wireless terminal and the at least one base station; the area setting unit divides at least one communication area of ​​the at least one base station into a plurality of subareas according to a level of the index related to the radio frequency deviation; the determination unit determines to execute processing to correct a deviation of the radio frequency in accordance with a level of an index related to a deviation of the radio frequency corresponding to the subarea corresponding to the target terminal. The control device according to claim 1 .

6. the index indicating the wireless channel characteristics is an index relating to a rate of time variation of a channel parameter during wireless communication between the wireless terminal and the at least one base station, the area setting unit divides at least one communication area of ​​the at least one base station into a plurality of subareas according to a level of an index related to a speed of time variation of the channel parameter; the determination unit determines a measurement period of the channel parameter according to a level of an index related to a speed of time variation of the channel parameter corresponding to the subarea corresponding to the target terminal. The control device according to claim 1 .

7. the index indicating the wireless channel characteristics is an index related to a propagation delay of radio waves during wireless communication between the wireless terminal and the at least one base station, the area setting unit divides at least one communication area of ​​the at least one base station into a plurality of subareas according to a level of the index related to the propagation delay of the radio wave; the determination unit determines to execute a process of compensating for the propagation delay in accordance with a level of an index related to the propagation delay of the radio wave corresponding to the subarea corresponding to the target terminal. The control device according to claim 1 .

8. a first wireless terminal in communication with at least one base station, an area setting unit that divides a movement route of the first wireless terminal into a plurality of subareas based on at least one of an index indicating wireless channel characteristics and a coverage area of ​​each of a plurality of beams of the at least one base station; a determination unit that determines a communication operation to be applied to the first wireless terminal based on information related to a subarea corresponding to the first wireless terminal; A first wireless terminal comprising:

9. 1. A method executed by a controller controlling at least one base station, comprising: Dividing at least one communication area of ​​the at least one base station into a plurality of subareas based on at least one of an indicator indicative of wireless channel characteristics or a coverage area of ​​each of a plurality of beams of the at least one base station; determining a communication action to apply to the target terminal based on information related to the sub-area corresponding to the target terminal; A method comprising:

10. a control device that controls at least one base station, Dividing at least one communication area of ​​the at least one base station into a plurality of subareas based on at least one of an indicator indicative of wireless channel characteristics or a coverage area of ​​each of a plurality of beams of the at least one base station; determining a communication action to apply to the target terminal based on information related to the sub-area corresponding to the target terminal; A program that executes a process, including:

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