Control device, RU device, du device, method, and program

Abstract

A control device comprises: a formation unit that forms a designation message containing information related to a designation value of a transmission resource upper limit value actually used in a system; and a designation unit that transmits the designation message to at least one of a distributed unit (DU) device and a radio unit (RU) device.

Description

Control device, RU device, DU device, method and program

[0001] The present disclosure relates to a control device, an RU device, a DU device, a method, and a program.

[0002] Techniques have been proposed for reducing the power consumption of radio base stations by efficiently operating the power amplifiers of the radio base stations.

[0003] Recently, a radio access network has been proposed in which the baseband unit and the radio unit of a base station are separated and connected via a fronthaul (see, for example, Non-Patent Document 1). The O-RAN (Open-Radio Access Network) fronthaul specification defined by the O-RAN Alliance defines the fronthaul specifications between an O-RAN Radio Unit (O-RU), which corresponds to the radio unit, and an O-RAN Distributed Unit (O-DU), which corresponds to the baseband unit. One of the goals of the O-RAN fronthaul specification is to facilitate the connection of an O-DU with an O-RU from a different vendor, thereby realizing a multi-vendor radio access network. Note that the O-DU may also be simply referred to as a DU device. The O-RU may also be simply referred to as an RU device.

[0004] O-RAN.WG4.CUS.0-R003-v15.00 Technical Specification, “O-RAN Working Group 4 (Open Fronthaul Interfaces WG) Control, User and Synchronization Plane Specification”, March 2024

[0005] In wireless communication systems, the maximum available bandwidth is determined by law or recommendation. The transmission power is also determined by law or specification. Wireless communication systems are designed to operate at maximum power when the maximum bandwidth is used.

[0006] The inventors have found that, for example, in certain time periods, radio resource utilization rates are significantly low, making it possible to perform communication at a bandwidth narrower than the maximum bandwidth. The inventors have also found that performing communication at a narrower bandwidth can reduce the power consumption of radio base stations. However, the inventors have found that, currently, a common upper limit value for the bandwidth available to the system for the DU and RU devices is not specified, and the DU and RU devices have no way of knowing this common upper limit value for the bandwidth. This means that it may not be possible to achieve unified power consumption reductions for the DU and RU devices.

[0007] An object of the present disclosure is to provide a control device, an RU device, a DU device, a method, and a program that can achieve unified power consumption reduction by a DU device and an RU device. 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.

[0008] The control device according to the present disclosure includes a forming unit that forms a designation message including information regarding a designated value of a transmission resource upper limit value actually used in the system, and a designation unit that transmits the designation message to at least one of a DU (Distributed Unit) device or an RU (Radio Unit) device.

[0009] The RU (Radio Unit) device according to the present disclosure includes a radio unit including a peak power reduction unit that reduces the peak power of a transmission radio signal based on a set threshold and a power amplifier that amplifies the transmission radio signal; an acquisition unit that acquires a designation message that includes information on a designated value that is a designated value of an upper limit of transmission resources actually used in the system and is common to a DU (Distributed Unit) device; and a control unit that sets the threshold based on the designated value and controls the amplification characteristics of the power amplifier based on the designated value.

[0010] The DU (Distributed Unit) device according to the present disclosure includes an acquisition unit that acquires a designated message including information on a designated value that is a designated value of an upper limit of transmission resources actually used in the system and is common to RU (Radio Unit) devices, and a control unit that controls the number of frequency resources to be used in the system based on the designated value.

[0011] The control method according to the present disclosure is a method executed by a control device, and includes forming a designation message including information regarding a designated value of a transmission resource upper limit value actually used in the system, and transmitting the designation message to at least one of a DU (Distributed Unit) device or an RU (Radio Unit) device.

[0012] The program according to the present disclosure causes a control device to perform processing including forming a designation message including information regarding a designated value of the transmission resource upper limit value actually used in the system, and transmitting the designation message to at least one of a DU (Distributed Unit) device or an RU (Radio Unit) device.

[0013] The present disclosure makes it possible to provide a control device, an RU device, a DU device, a method, and a program that can achieve unified power consumption reduction by a DU device and an RU device.

[0014] 1 is a diagram illustrating an example of a communication system of the present disclosure. 2 is a block diagram illustrating an example of a control device of the present disclosure. 3 is a block diagram illustrating an example of a DU device of the present disclosure. 4 is a block diagram illustrating an example of an RU device of the present disclosure. 5 is a diagram provided for explaining a comparative example. 6 is a diagram provided for explaining a comparative example. 7 is a diagram provided for explaining a comparative example. 8 is a block diagram illustrating another example of a control device of the present disclosure. 9 is a block diagram illustrating another example of a DU device of the present disclosure. 10 is a diagram illustrating an example of a designation message as a C-Plane message. 11 is a diagram illustrating a specific example of the configuration of an RU device of the present disclosure. 12 is a diagram illustrating an example of the configuration of a control device. 13 is a diagram illustrating an example of the configuration of a DU device. 14 is a diagram illustrating an example of the configuration of an RU device.

[0015] 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 description will be omitted.

[0016] <First embodiment> <Overview of communication system> Fig. 1 is a diagram illustrating an example of a communication system according to the present disclosure. In Fig. 1, the communication system 1 includes a control device 10, a DU (Distributed Unit) device 20, and an RU (Radio Unit) device 30. The communication system 1 may also include a CU (Central Unit) device (not shown). Furthermore, a wireless terminal (not shown) present within the service area of ​​the RU device 30 is wirelessly connected to the RU device 30.

[0017] The control device 10 assigns the upper limit value of transmission resources actually used in the system to the DU device 20 and the RU device 30. As a result, the DU device 20 and the RU device 30 are assigned a common upper limit value of transmission resources, so that the DU device 20 and the RU device 30 can achieve unified power consumption reduction.

[0018] 1, the control device 10 is shown as an independent device, but the present disclosure is not limited to this. The control device 10 may be included in the above-mentioned CU device, a RIC (RAN Intelligent Controller) (not shown), or the DU device 20, for example.

[0019] <Configuration example of control device> Fig. 2 is a block diagram showing an example of a control device of the present disclosure. In Fig. 2, a control device 10 has a forming unit 11 and a designation unit 12.

[0020] The forming unit 11 forms a specification message including information on a specified value of a "transmission resource upper limit value" that is actually used in the communication system 1. The "transmission resource upper limit value" may be, for example, a bandwidth upper limit value or a transmission power upper limit value.

[0021] The designation unit 12 transmits the designation message formed by the formation unit 11 to at least one of the DU device 20 and the RU device 30 .

[0022] For example, if the control device 10 is an independent device or is included in a device other than the DU device 20 or the RU device 30, the designation unit 12 may send a designation message to each of the DU device 20 and the RU device 30. Alternatively, if the control device 10 is an independent device or is included in a device other than the DU device 20 or the RU device 30, the designation unit 12 may send a designation message to the DU device 20 and also send a designation message to the RU device 30 via the DU device 20. Alternatively, if the control device 10 is included in the DU device 20, the designation unit 12 may send a designation message to the RU device 30. In this case, the designation unit 12 sends the designation message to an acquisition unit 21 (described later) inside the DU device 20.

[0023] <Configuration Example of DU Device> Fig. 3 is a block diagram showing an example of a DU device of the present disclosure. In Fig. 3, a DU device 20 has an acquisition unit 21 and a control unit 22.

[0024] The acquisition unit 21 acquires the above-mentioned designation message. As described above, the designation message includes information on the designated value, which is the transmission resource upper limit value and is common to the RU device 30.

[0025] The control unit 22 controls the number of frequency resources used in the communication system 1 based on the specified value. For example, the control unit 22 may store a correspondence relationship that associates multiple candidate values ​​for the transmission resource upper limit value with the number of frequency resources corresponding to each candidate value. In this correspondence relationship, a smaller candidate value among the multiple candidate values ​​is associated with a smaller number of frequency resources. Then, the control unit 22 identifies the number of frequency resources associated with a candidate value that matches the specified value included in the specification message in the correspondence relationship. Then, the control unit 22 may limit the number of frequency resources used in the communication system 1 to the identified number of frequency resources.

[0026] Here, by limiting the number of frequency resources used in the communication system 1 according to the specified value of the transmission resource upper limit, it is possible to limit (reduce) the average power of the transmission signal in the RU device 30.

[0027] <Configuration Example of RU Device> Fig. 4 is a block diagram showing an example of an RU device according to the present disclosure. In Fig. 4, an RU device 30 includes an acquisition unit 31, a control unit 32, and a radio unit 35.

[0028] The radio unit 35 performs predetermined radio transmission processing on the transmission signal to form a radio signal, and transmits the radio signal. Here, it is assumed that the transmission signal is a multicarrier modulated signal (e.g., an Orthogonal Frequency Division Multiplexing (OFDM) signal).

[0029] For example, the radio unit 35 includes a peak power reduction unit 36 ​​and a power amplifier 37 .

[0030] The peak power reduction unit 36 ​​reduces the peak power of the transmitted radio signal based on a set threshold. It is known that a multicarrier modulated signal generates a high PAPR (Peak to Average Power Ratio). The peak power reduction unit 36 ​​limits the power of the multicarrier modulated signal to below the set threshold by using CFR (Crest Factor Reduction), such as clipping.

[0031] The power amplifier 37 amplifies the input transmission radio signal in accordance with the amplification characteristics of the power amplifier 37 .

[0032] The acquisition unit 31 acquires the above-mentioned designation message. As described above, the designation message is a designated value of the transmission resource upper limit value and includes information on the designated value that is common to the RU device 30. The acquisition unit 31 may acquire the designation message, for example, without going through the DU device 20, or may acquire the designation message through the DU device 20.

[0033] The control unit 32 sets the threshold value of the peak power reduction unit 36 ​​based on the specified value indicated by the information included in the specification message. For example, the control unit 32 may store a correspondence relationship that associates multiple candidate values ​​for the transmission resource upper limit with threshold values ​​corresponding to each candidate value. In this correspondence relationship, the smaller the candidate value among the multiple candidate values, the smaller the threshold value that is associated with the candidate value. The control unit 32 then identifies the threshold value associated with the candidate value that matches the specified value included in the specification message in the correspondence relationship. The control unit 32 then sets the identified threshold value in the peak power reduction unit 36.

[0034] Furthermore, the control unit 32 controls the amplification characteristics of the power amplifier 37 based on the designated value indicated by the information included in the designation message. For example, the control unit 32 controls the amplification characteristics of the power amplifier 37 by controlling the drain current of the power amplifier 37. Specifically, the control unit 32 controls the drain current of the power amplifier 37 by controlling the gate voltage of the power amplifier 37. For example, the control unit 32 may maintain a correspondence relationship that associates multiple candidate values ​​for the transmission resource upper limit with gate voltage values ​​corresponding to each candidate value. In this correspondence relationship, smaller candidate values ​​among the multiple candidate values ​​are associated with smaller gate voltage values. The control unit 32 then identifies a gate voltage associated with a candidate value that matches the designated value included in the designation message in the correspondence relationship. The control unit 32 then controls the gate voltage of the power amplifier 37 to the identified gate voltage value. As a result, the drain current of the power amplifier 37 can be reduced as the designated value indicated by the information included in the designation message decreases. This reduces the power consumption of the power amplifier 37. In addition to controlling the gate voltage of the power amplifier 37 , the control unit 32 may control the drain current of the power amplifier 37 by controlling a drain current supply circuit (not shown) to the power amplifier 37 .

[0035] The control unit 32 may control the bias of the power amplifier 37 based on the designated value indicated by the information included in the designation message. For example, the control unit 32 may maintain a correspondence relationship that associates multiple candidate values ​​for the transmission resource upper limit value with a bias value corresponding to each candidate value. In this correspondence relationship, the smaller the candidate value among the multiple candidate values, the smaller the bias value that is associated with the candidate value. The control unit 32 then identifies the bias value associated with the candidate value that matches the designated value included in the designation message in the correspondence relationship. The control unit 32 then controls the bias of the power amplifier 37 to the identified bias value. This makes it possible to reduce the power consumption of the power amplifier 37.

[0036] As described above, the DU device 20 limits the number of frequency resources used in the communication system 1 according to the transmission resource upper limit value. As a result, the smaller the specified value, the more the average power of the transmission signal (multicarrier modulated signal) in the RU device 30 can be limited (reduced). Furthermore, the control unit 32 in the RU device 30 sets a threshold for the peak power reduction unit 36 ​​based on the specified value indicated by the information included in the specification message. As a result, the smaller the specified value, the more the peak power of the transmission signal (multicarrier modulated signal) can be suppressed. As a result, the smaller the specified value, the more the power of the signal input to the power amplifier 37 can be reduced. Therefore, even if the drain current of the power amplifier 37 is reduced as the specified value becomes smaller, the power of the signal input to the power amplifier 37 falls within the linear range of the power amplifier 37. Reducing the drain current of the power amplifier 37 can reduce the power consumption of the power amplifier 37. Furthermore, because the power of the signal input to the power amplifier 37 falls within the linear range of the power amplifier 37, the power amplifier 37 can operate in the linear range. From the above, it is possible to achieve a unified reduction in power consumption by the DU device 20 and the RU device 30.

[0037] <Comparative Example> Figures 5A, 5B, 6A, and 6B are diagrams used to explain a comparative example. Figure 5A shows an example of the amplification characteristics of the power amplifier 37. In Figure 5A, the power of the input signal to the power amplifier 37 falls within the linear region of the power amplifier 37, and the power amplifier 37 operates in the linear region. The input signal to this power amplifier 37 is, for example, an input signal at the maximum bandwidth. Here, if the drain current of the power amplifier 37 is limited, the range of the linear region in the amplification characteristics of the power amplifier 37 (new amplification characteristics of Figure 5B) becomes narrower, as shown in Figure 5B. In this case, the peak power falls into the nonlinear region of the power amplifier 37, causing nonlinear distortion in the output signal from the power amplifier 37.

[0038] The input signal to the power amplifier 37 shown on the left side of Figure 6A is assumed to be the same as that shown in Figure 5A. Here, if the DU device 20 limits the number of frequency resources used in the communication system 1 according to the specified transmission resource upper limit, the average power of the transmission signal (multicarrier modulated signal) in the RU device 30 can be limited (reduced), as shown on the right side of Figure 6A. However, because the threshold (CFR operating point) of the peak power reduction unit 36 ​​is not adjusted here, there is no change in peak power between the left and right sides of Figure 6A. Therefore, if the DU device 20 simply limits the number of frequency resources used in the communication system 1 according to the specified transmission resource upper limit, as in Figure 5B, limiting the drain current of the power amplifier 37 will cause the peak power to enter the nonlinear region of the power amplifier 37, resulting in nonlinear distortion in the output signal from the power amplifier 37.

[0039] 6B, in the first embodiment, the DU device 20 limits the number of frequency resources used in the communication system 1 according to the designated value of the transmission resource upper limit, and the control unit 32 in the RU device 30 sets the threshold of the peak power reduction unit 36 ​​based on the designated value indicated by the information included in the designation message. As a result, the power of the signal input to the power amplifier 37 falls within the linear region of the power amplifier 37, allowing the power amplifier 37 to operate in the linear region.

[0040] Second Embodiment The second embodiment mainly relates to determining the designated value of the transmission resource upper limit. The basic configuration of the communication system of the second embodiment is the same as the configuration of the communication system 1 of the first embodiment, so refer to Fig. 1. Furthermore, the basic configurations of the DU device and RU device of the second embodiment are the same as the DU device 20 and RU device 30 of the first embodiment, so refer to Figs. 3 and 4.

[0041] <Configuration example of control device> Fig. 7 is a block diagram showing another example of the control device of the present disclosure. In Fig. 7, the control device 40 has a determination unit 41, a formation unit 42, and a designation unit 43. The communication system 1 of the second embodiment has the control device 40 instead of the control device 10.

[0042] The determination unit 41 determines a designated value from among a plurality of candidate values ​​for the transmission resource upper limit value. For example, the determination unit 41 holds a correspondence relationship that associates a plurality of candidate values ​​with time information corresponding to each candidate value. The determination unit 41 then determines, as the designated value, the candidate value that is associated with the time information corresponding to the current time in the correspondence relationship.

[0043] Here, the utilization rate of transmission resources in the communication system 1 varies depending on the time period. For example, if the utilization rate of the time period with the highest utilization rate is 100%, the utilization rate of the time period with the lowest utilization rate may be, for example, 25%. There is a predetermined pattern for the utilization rate of transmission resources with respect to the time period in a day. The above correspondence is based on this predetermined pattern.

[0044] Furthermore, the determination unit 41 may further determine the start time of application of the specified value and the duration for which the specified value is applied. The determination unit 41 can determine the start time of application of the specified value and the duration for which the specified value is applied based on the above-mentioned predetermined pattern. For example, in 5G NR (New Radio), DU and RU devices generally operate in slot time units. Therefore, it is optimal to set the application start time to a slot granularity. However, one slot in a 30 kHz subcarrier is 0.5 ms. For the purpose of notifying bandwidth usage status late at night, a 0.5 ms granularity is too fine, and the coarsest granularity, the System Frame Number (SFN) with a 10 ms granularity, is more appropriate. This SFN has one cycle of approximately 40 seconds. Therefore, even with low-speed operations such as CPUs with relatively slow response times, it is easy to establish synchronization between physically different devices. Therefore, by expressing the start time at least in SFN, it is possible to synchronize the time between the CU device, DU device, and RU device. Naturally, in addition to SFN, it is also possible to use finer time units such as subframe (1 ms), slot, or symbol.

[0045] Similar to the forming unit 11 of the first embodiment, the forming unit 42 forms a designation message including information about the designated value of the "transmission resource upper limit value." For example, the forming unit 42 includes, in the designation message, the designated value itself or an indicator indicating the designated value as the information about the designated value. Furthermore, the forming unit 42 may further include, in the designation message, information indicating the start time of application of the designated value and a duration for which application of the designated value continues, as the information about the designated value. As described above, the information indicating the start time of application of the designated value may be a time parameter in which the absolute time of the start time of application is expressed using the SFN.

[0046] The designation unit 43 transmits the designation message formed by the formation unit 42 to the DU device 20 and the RU device 30 .

[0047] In the DU device 20 of the second embodiment, the control unit 22 controls, based on the designated value, the number of frequency resources to be used in the communication system 1. Here, if the designation message includes information indicating the start time of application of the designated value and the duration for which application of the designated value continues, the control unit 22 may start controlling the number of frequency resources based on the designated value at the start time of application and end it when the duration has elapsed from the start time.

[0048] In the RU device 30 of the second embodiment, the control unit 32 sets the threshold value of the peak power reduction unit 36 ​​based on the specified value indicated by the information included in the specification message. The control unit 32 also controls the amplification characteristics of the power amplifier 37 based on the specified value indicated by the information included in the specification message. Here, if the specification message includes information indicating the start time of application of the specified value and the duration for which application of the specified value continues, the control unit 32 may set the threshold value of the peak power reduction unit 36 ​​to the start time of application. The control unit 32 may also start controlling the amplification characteristics of the power amplifier 37 at the start time of application.

[0049] <Third Embodiment> The third embodiment mainly relates to a designation message transmitted from a DU device to an RU device. That is, in the third embodiment, a control device transmits a designation message to a DU device, and the DU device transmits the designation message to an RU device as a C-Plane message. The basic configuration of the communication system of the second embodiment is the same as the configuration of the communication system 1 of the first embodiment, so refer to FIG. 1. The basic configuration of the control device of the third embodiment is the same as the control device 10 of the first embodiment or the control device 40 of the second embodiment, so refer to FIG. 2 or FIG. 7. The basic configuration of the RU device of the third embodiment is the same as the RU device 30 of the first embodiment, so refer to FIG. 4.

[0050] <Configuration Example of DU Device> Fig. 8 is a block diagram showing another example of a DU device of the present disclosure. In Fig. 8, the DU device 50 has an acquisition unit 51, a control unit 52, a formation unit 53, and a transmission unit 54. The communication system 1 of the third embodiment has the DU device 50 instead of the DU device 20.

[0051] Similar to the acquisition unit 21 of the first embodiment, the acquisition unit 51 acquires a designation message (hereinafter, sometimes referred to as a first designation message) from the control device 10. The first designation message includes, for example, a designation value of the transmission resource upper limit value, and information on the designation value that is common to the RU device 30.

[0052] The control unit 52 controls the number of frequency resources used in the communication system 1 based on a designated value, similar to the control unit 22 of the first embodiment.

[0053] The forming unit 53 uses the information contained in the first designation message obtained from the control device 10 to form a designation message (hereinafter sometimes referred to as a second designation message) as a C-Plane message.

[0054] FIG. 9 is a diagram showing an example of a designation message as a C-Plane message. An example of the configuration of a C-Plane message is specified in Chapter 7 of Non-Patent Document 1. Chapter 7 of Non-Patent Document 1 already defines nine Section Types, Section Types 0 to 8. Section Types are assigned according to the information indicated by the C-Plane message. In the third embodiment, a new "Section Type Z" is defined. "Section Type Z" is a Section Type for specifying a designated value for the transmission resource upper limit value to the RU device 30. Furthermore, C-Plane messages of Section Types 0 to 8 require real-time performance and are therefore transmitted at intervals of, for example, several hundred microseconds. For example, Section Type 8 is assigned to "ACK / NACK Feedback." In contrast, C-Plane messages of Section Type Z (second designation messages) are transmitted at intervals of approximately 1 msec to 10 msec. That is, the second specification message includes an information element capable of specifying the Section Type of the information transmitted by the C-Plane message, and this information element holds a first Section Type value indicating that the information transmitted by the C-Plane message is a transmission resource upper limit value. The transmission interval of a C-Plane message of the first Section Type indicated by the first Section Type value is longer than the transmission interval of a C-Plane message of any other Section Type other than the first Section Type.

[0055] Furthermore, the C-Plane message of Section Type Z (second designation message) includes an information element (TX Power / Bandwidth indication IE in FIG. 9 ) that includes information regarding the designated value of the transmission resource upper limit. For example, the TX Power / Bandwidth Indicator included in the TX Power / Bandwidth indication IE consists of 7 bits (0-128). Upon receiving the second designation message, the RU device 30 performs energy saving, assuming that the designated value of the transmission resource upper limit will continue until the next designation message is received.

[0056] The transmitter 54 transmits the second designation message to the RU device 30 .

[0057] <First Modification of Third Embodiment> A designated value of the transmission resource upper limit value may be indicated by an extended antenna-carrier identifier (eAxC-ID) included in a C-Plane message. In this case, the number of eAxC-IDs prepared is equal to the number obtained by multiplying the number of targets for designating the transmission resource upper limit value by the number of candidate values ​​for the transmission resource upper limit value.

[0058] For example, suppose that the targets for specifying transmission resource upper limit values ​​are four antenna units, Antennas #0-3, and four eAxC-IDs, 0x0000-0x0003, are assigned to the four antenna units. If there are four candidate values ​​for the transmission resource upper limit value, namely, 100% bandwidth, 90% bandwidth, 80% bandwidth, and 70% bandwidth, the eAxC-IDs may be prepared as follows: 4T4R: 0x0000-0x0003: Antenna#0-3 TX. 100% power (100% bandwidth) 4T4R: 0x0010-0x0013: Antenna#0-3 TX. 90% power (90% bandwidth) 4T4R: 0x0020-0x0023: Antenna#0-3 TX. 80% power (80% bandwidth) 4T4R: 0x0030-0x0033: Antenna#0-3 TX. 70% power (70% bandwidth)

[0059] <Second Modification of Third Embodiment> The most significant bit of numPrbc (number of contiguous PRBs per data section description) defined in Chapter 7.5.3.6 of Non-Patent Document 1 may be used to specify the upper limit value of transmission resources.

[0060] <Fourth Embodiment> The fourth embodiment relates to a specific configuration example of an RU device.

[0061] Figure 10 is a diagram showing a specific example configuration of an RU device according to the present disclosure. In Figure 10, an RU device 60 includes an interface unit 61, a control unit 62, a baseband unit 63, and a radio unit 64. The radio unit 64 includes a filter unit 64A, a frequency conversion unit 64B, a peak power reduction unit 64C, and a distortion compensation unit 64D. The radio unit 64 further includes a digital-to-analog conversion unit (D / A) 64E, a power amplifier 64F, a filter unit 64G, and an analog-to-digital conversion unit (A / D) 64H.

[0062] The interface unit 61 receives signals transmitted from other nodes. The interface unit 61 corresponds to, for example, the acquisition unit 31 in the first embodiment. The interface unit 61 may also receive signals transmitted from the DU devices 20 and 50 and extract a C-Plane signal and a U (User)-Plane signal from the received signals. The interface unit 61 then outputs the C-Plane signal and the U-Plane signal to the baseband unit 63, and outputs the C-Plane signal to the control unit 62.

[0063] Similar to the control unit 32 in the first embodiment, the control unit 62 sets a threshold value for the peak power reduction unit 64C based on a designated value indicated by information included in the designation message received by the interface unit 61. Also, similar to the control unit 32 in the first embodiment, the control unit 62 controls the amplification characteristics of the power amplifier 64F based on a designated value indicated by information included in the designation message.

[0064] The baseband unit 63 performs various signal processing including beamforming and OFDM modulation on the U-Plane signal based on the control of the C-Plane to form a transmission signal.

[0065] The filter unit 64A applies band limitation to the transmission signal formed by the baseband unit 63 and outputs the band-limited transmission signal to the frequency conversion unit 64B. The filter unit 64A is, for example, a digital filter.

[0066] The frequency conversion unit 64B shifts the frequency of the transmission signal received from the filter unit 64A. For example, the frequency conversion unit 64B shifts the frequency of the transmission signal from the baseband to an intermediate frequency band.

[0067] The peak power reducing unit 64C reduces the peak power of the transmission radio signal based on a set threshold value, similar to the peak power reducing unit 36 ​​of the first embodiment.

[0068] The distortion compensator 64D performs distortion compensation processing on the transmission signal received from the peak power reducer 64C so as to cancel out distortion components contained in the feedback signal received from the distortion monitoring feedback path including the analog-to-digital converter 64H.

[0069] The digital-to-analog converter 64E converts the digital transmission signal received from the distortion compensator 64D into an analog transmission signal (transmission radio signal).

[0070] The power amplifier 64F amplifies the input transmission radio signal in accordance with the amplification characteristics of the power amplifier 37. The output signal of the power amplifier 64F is output to a filter unit 64G and an analog-to-digital conversion unit 64H.

[0071] The filter unit 64G reduces the radiated power outside the desired band in the transmission radio signal received from the power amplifier 64F. The radio signal that has passed through the filter unit 64G is radiated into the air via an antenna.

[0072] The analog-to-digital converter 64H converts the analog radio signal received from the power amplifier 64F into a digital radio signal.

[0073] <Other Embodiments> <1> FIG. 11 is a diagram illustrating an example configuration of a control device. In FIG. 11, the control device 100 includes a processor 101 and a memory 102. The control devices 10 and 40 may have the configuration illustrated in FIG. 11. The processor 101 may be, for example, a microprocessor, a microprocessing unit (MPU), or a central processing unit (CPU). The processor 101 may include multiple processors. The memory 102 is configured by a combination of volatile memory and nonvolatile memory. The memory 102 may include multiple physically independent memory devices. The volatile memory may be, for example, static random access memory (SRAM), dynamic RAM (DRAM), or a combination thereof. The nonvolatile memory may be, for example, mask read only memory (MROM), electrically erasable programmable ROM (EEPROM), flash memory, a hard disk drive, or any combination thereof. 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 I (Input) / O (Output) interface (not shown).

[0074] The memory 102 may store one or more software modules (computer programs) including instructions and data for performing processing by the control devices 10 and 40 described in the above-described embodiments. In some implementations, the processor 101 may be configured to read and execute the software modules from the memory 102, thereby performing processing by the control devices 10 and 40 described in the above-described embodiments.

[0075] <2> Fig. 12 is a diagram showing an example of the configuration of a DU device. In Fig. 12, a device 200 includes a network interface 201, a processor 202, and a memory 203. The DU devices 20 and 50 may have the configuration shown in Fig. 12.

[0076] The network interface 201 is used, for example, to communicate with network elements (e.g., the control devices 10 and 40, the RU devices 30 and 60, a Service Management and Orchestration (SMO) device, and other RAN nodes). The network interface 1201 may include, for example, a network interface card (NIC) compliant with the IEEE 802.3 series.

[0077] The processor 202 may be, for example, a microprocessor, an MPU, or a CPU. The processor 202 may include multiple processors.

[0078] The memory 203 is composed of volatile memory and nonvolatile memory. The memory 203 may include multiple physically independent memory devices. The volatile memory is, for example, Static Random Access Memory (SRAM), Dynamic RAM (DRAM), or a combination thereof. The nonvolatile memory is, for example, Mask Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, or a hard disk drive, or any combination thereof. The memory 203 may include storage located remotely from the processor 202. In this case, the processor 202 may access the memory 203 via the network interface 201 or an I / O interface.

[0079] The memory 203 may store one or more software modules (computer programs) including instructions and data for performing the processes of the DU device 20, 50 described in the above-described embodiments. In some implementations, the processor 202 may be configured to read and execute the software modules from the memory 203, thereby performing the processes of the DU device 20, 50 described in the above-described embodiments.

[0080] <3> Figure 13 shows an example configuration of an RU device. In Figure 13, the device 300 includes an antenna array 301, a radio frequency transceiver 302, a network interface 303, a processor 304, and a memory 305. The RU device 30, 60 may have the configuration shown in Figure 13. The RF transceiver 302 performs analog RF signal processing for communication with UEs. The RF transceiver 302 may include multiple transceivers. The RF transceiver 302 is coupled to the antenna array 301 and the processor 304. The RF transceiver 302 receives modulation symbol data from the processor 304, generates a transmit RF signal, and provides the transmit RF signal to the antenna array 301. The RF transceiver 302 also generates a baseband receive signal based on the receive RF signal received by the antenna array 301 and provides the baseband receive signal to the processor 304. The RF transceiver 302 may include an analog beamformer circuit for beamforming. The analog beamformer circuitry includes, for example, multiple phase shifters and multiple power amplifiers.

[0081] The network interface 303 is used to communicate with network nodes (e.g., the control devices 10 and 40, and the DU devices 20 and 50). The network interface 303 may include, for example, a network interface card (NIC) that complies with the IEEE 802.3 series.

[0082] The processor 304 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication. The processor 304 may include multiple processors. For example, the processor 304 may include a modem processor (e.g., a Digital Signal Processor (DSP)) that performs digital baseband signal processing and a protocol stack processor (e.g., a Central Processing Unit (CPU) or a Micro Processing Unit (MPU)) that performs control plane processing.

[0083] The processor 304 may include a digital beamformer module for beamforming, which may include a Multiple Input Multiple Output (MIMO) encoder and precoder.

[0084] The memory 305 is configured by a combination of volatile memory and non-volatile memory. The volatile memory is, for example, Static Random Access Memory (SRAM), Dynamic RAM (DRAM), or a combination thereof. The non-volatile memory is, for example, Mask Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, or a hard disk drive, or any combination thereof. The memory 305 may include storage located remotely from the processor 304. In this case, the processor 304 may access the memory 305 via the network interface 303 or an I / O interface (not shown).

[0085] The memory 305 may store one or more software modules (computer programs) including instructions and data for performing the processes of the RU device 30, 60 described in the above-described embodiments. In some implementations, the processor 304 may be configured to read and execute the software modules from the memory 305 to perform the processes of the RU device 30, 60 described in the above-described embodiments.

[0086] 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.

[0087] Each drawing is merely an example for describing one or more embodiments. Each drawing may not relate to only one particular embodiment, but may also relate 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.

[0088] Some or all of the above embodiments can be described as, but are not limited to, the following supplementary notes. (Supplementary Note 1) A control device comprising: a forming unit that forms a designation message including information about a designated value of a transmission resource upper limit value actually used in a system; and a designation unit that transmits the designation message to at least one of a DU (Distributed Unit) device or an RU (Radio Unit) device. (Supplementary Note 2) The control device according to Supplementary Note 1, wherein the forming unit forms the designation message including, as information about the designated value, the designated value or an indicator indicating the designated value. (Supplementary Note 3) The control device according to Supplementary Note 2, wherein the forming unit further includes, in the designation message, information indicating a start time of application of the designated value and a duration for which application of the designated value will continue, as information about the designated value. (Supplementary Note 4) The control device according to Supplementary Note 3, wherein the information indicating the start time of application of the designated value is a time parameter in which the absolute time of the start time of application is expressed using at least a System Frame Number (SFN). (Supplementary Note 5) The control device according to Supplementary Note 1, further comprising a determination unit that determines the designated value from among a plurality of candidate values ​​for the transmission resource upper limit value. (Supplementary Note 6) The control device according to Supplementary Note 5, wherein the determination unit maintains a correspondence relationship that associates the plurality of candidate values ​​with time information corresponding to each candidate value, and determines, as the designated value, a candidate value that is associated in the correspondence relationship with time information corresponding to a current time. (Supplementary Note 7) The control device according to Supplementary Note 1, wherein the transmission resource upper limit value is a bandwidth upper limit value or a transmission power upper limit value. (Supplementary Note 8) An RU (Radio Unit) device comprising: a radio unit including: a peak power reduction unit that reduces peak power of a transmission radio signal based on a set threshold; and a power amplifier that amplifies the transmission radio signal; an acquisition unit that acquires a designation message that includes information on a designated value that is a designated value for the transmission resource upper limit value actually used in a system and is common to DU (Distributed Unit) devices; and a control unit that sets the threshold based on the designated value and controls the amplification characteristics of the power amplifier based on the designated value.(Supplementary Note 9) The RU apparatus of Supplementary Note 8, wherein the control unit controls the amplification characteristics by controlling a drain current of the power amplifier. (Supplementary Note 10) The RU apparatus of Supplementary Note 9, wherein the control unit controls the drain current by controlling a gate voltage of the power amplifier. (Supplementary Note 11) The RU apparatus of any one of Supplements 8 to 10, wherein the control unit controls the bias of the power amplifier based on the specified value. (Supplementary Note 12) The RU apparatus of any one of Supplements 8 to 10, wherein the acquisition unit receives the designation message including, as information regarding the designated value, the designated value or an indicator indicating the designated value. (Supplementary Note 13) The RU apparatus of Supplementary Note 12, wherein the designation message further includes, as information regarding the designated value, information indicating a start time of application of the designated value and a duration for which application of the designated value will continue. (Supplementary Note 14) The RU apparatus of Supplementary Note 13, wherein the information indicating the start time of application of the designated value is a time parameter in which the absolute time of the designated value is expressed using at least a System Frame Number (SFN). (Supplementary Note 15) The RU device according to Supplementary Note 8, wherein the transmission resource upper limit value is a bandwidth upper limit value or a transmission power upper limit value. (Supplementary Note 16) A DU (Distributed Unit) device comprising: an acquisition unit that acquires a designation message including information on a designated value that is a designated value of a transmission resource upper limit value actually used in a system and is common to RU (Radio Unit) devices; and a control unit that controls the number of frequency resources to be used in the system based on the designated value. (Supplementary Note 17) The DU device according to Supplementary Note 16, wherein the acquisition unit receives the designation message including, as information on the designated value, the designated value or an indicator indicating the designated value. (Supplementary Note 18) The DU device according to Supplementary Note 17, wherein the designation message further includes, as information on the designated value, information indicating a start time for application of the designated value and a duration for which application of the designated value continues.(Supplementary Note 19) The DU device according to Supplementary Note 18, wherein the information indicating the application start time of the specified value is a time parameter in which the absolute time of the specified value is expressed using at least a System Frame Number (SFN). (Supplementary Note 20) The DU device according to Supplementary Note 16, wherein the transmission resource upper limit value is a bandwidth upper limit value or a transmission power upper limit value. (Supplementary Note 21) The DU device according to Supplementary Note 16, comprising: a forming unit that forms a second designation message based on the acquired designation message; and a transmitting unit that transmits the second designation message to the RU device. (Supplementary Note 22) The DU device according to Supplementary Note 21, wherein the second designation message is a C (Control)-Plane message, and includes an information element capable of designating a Section Type of information transmitted by the C-Plane message, the information element holds a first Section Type value indicating that the transmitted information is the transmission resource upper limit value, and a transmission interval of a C-Plane message of the first Section Type indicated by the first Section Type value is longer than a transmission interval of a C-Plane message of a Section Type other than the first Section Type. (Supplementary Note 23) A control method executed by a control device, comprising: forming a designation message including information regarding a designated value of a transmission resource upper limit value actually used in a system; and transmitting the designation message to at least one of a DU (Distributed Unit) device or an RU (Radio Unit) device. (Supplementary Note 24) The control method according to Supplementary Note 23, wherein the forming includes forming the designation message including, as information regarding the designated value, the designated value or an indicator indicating the designated value. (Supplementary Note 25) The control method according to Supplementary Note 24, wherein the forming step further includes including, in the designation message, information indicating a start time of application of the designated value and a duration for which application of the designated value continues, as information regarding the designated value.(Supplementary Note 26) The control method according to Supplementary Note 25, wherein the information indicating the application start time of the designated value is a time parameter in which the absolute time of the application start time is expressed using at least a System Frame Number (SFN). (Supplementary Note 27) The control method according to Supplementary Note 23, further comprising determining the designated value from among a plurality of candidate values ​​for the transmission resource upper limit value. (Supplementary Note 28) The control method according to Supplementary Note 27, wherein the determining includes determining, as the designated value, a candidate value associated with time information corresponding to the current time in a correspondence relationship that associates the plurality of candidate values ​​with time information corresponding to each candidate value. (Supplementary Note 29) The control method according to Supplementary Note 23, wherein the transmission resource upper limit value is a bandwidth upper limit value or a transmission power upper limit value. (Supplementary Note 30) A method executed by an RU (Radio Unit), the RU having a radio unit including a peak power reduction unit that reduces peak power of a transmission radio signal based on a set threshold, and a power amplifier that amplifies the transmission radio signal, the method comprising: acquiring a designation message including information on a designated value that is a designated value of an upper limit of transmission resources actually used in the system and is common to a DU (Distributed Unit) device; setting the threshold based on the designated value, and controlling amplification characteristics of the power amplifier based on the designated value. (Supplementary Note 31) The method according to Supplementary Note 30, wherein the controlling includes controlling the amplification characteristics by controlling a drain current of the power amplifier. (Supplementary Note 32) The method according to Supplementary Note 31, wherein the controlling includes controlling the drain current by controlling a gate voltage of the power amplifier. (Supplementary Note 33) The method according to any one of Supplements 30 to 32, wherein the controlling includes controlling a bias of the power amplifier based on the designated value. (Supplementary Note 34) The method according to any one of Supplementary Notes 30 to 32, wherein the obtaining includes receiving the specification message including, as information relating to the specified value, the specified value or an indicator indicating the specified value.(Supplementary Note 35) The method according to Supplementary Note 34, wherein the designation message further includes, as information related to the designated value, information indicating a start time of application of the designated value and a duration for which application of the designated value will continue. (Supplementary Note 36) The method according to Supplementary Note 35, wherein the information indicating a start time of application of the designated value is a time parameter in which the absolute time of the designated value is expressed using at least a System Frame Number (SFN). (Supplementary Note 37) The method according to Supplementary Note 30, wherein the transmission resource upper limit value is a bandwidth upper limit value or a transmission power upper limit value. (Supplementary Note 38) A method executed by a Distributed Unit (DU) device, comprising: acquiring a designation message including information related to a designated value of a transmission resource upper limit value actually used in a system and which is common to Radio Unit (RU) devices; and controlling the number of frequency resources used in the system based on the designated value. (Supplementary Note 39) The method according to Supplementary Note 38, wherein the acquiring includes receiving a designation message including, as information related to the designated value, the designated value or an indicator indicating the designated value. (Supplementary Note 40) The method of Supplementary Note 39, wherein the specification message further includes, as information about the specified value, information indicating a start time of application of the specified value and a duration for which application of the specified value continues. (Supplementary Note 41) The method of Supplementary Note 40, wherein the information indicating a start time of application of the specified value is a time parameter in which the absolute time of the specified value is expressed using at least a System Frame Number (SFN). (Supplementary Note 42) The method of Supplementary Note 38, wherein the transmission resource upper limit value is a bandwidth upper limit value or a transmission power upper limit value. (Supplementary Note 43) The method of Supplementary Note 38, comprising: forming a second specification message based on the acquired specification message; and transmitting the second specification message to the RU device.(Supplementary Note 44) The method according to Supplementary Note 43, wherein the second designation message is a C (Control)-Plane message, and includes an information element capable of designating a Section Type of information transmitted by the C-Plane message, wherein the information element holds a first Section Type value indicating that the transmitted information is the transmission resource upper limit value, and wherein a transmission interval of a C-Plane message of the first Section Type indicated by the first Section Type value is longer than a transmission interval of a C-Plane message of a Section Type other than the first Section Type. (Supplementary Note 45) A program that causes a control device to execute processing including: forming a designation message including information regarding a designated value of a transmission resource upper limit value actually used in the system; and transmitting the designation message to at least one of a DU (Distributed Unit) device or an RU (Radio Unit) device. (Supplementary Note 46) The program according to Supplementary Note 45, wherein the forming includes forming the designation message including, as information regarding the designated value, the designated value or an indicator indicating the designated value. (Supplementary Note 47) The program according to Supplementary Note 46, wherein the forming includes further including, in the specification message, information indicating a start time of application of the specified value and a duration for which application of the specified value will continue, as information related to the specified value. (Supplementary Note 48) The program according to Supplementary Note 47, wherein the information indicating a start time of application of the specified value is a time parameter in which the absolute time of the start time of application is expressed using at least a System Frame Number (SFN). (Supplementary Note 49) The program according to Supplementary Note 45, wherein the processing further includes determining the specified value from among a plurality of candidate values ​​for the transmission resource upper limit value. (Supplementary Note 50) The program according to Supplementary Note 49, wherein the determining includes determining, as the specified value, a candidate value associated with time information corresponding to the current time in a correspondence relationship that associates the plurality of candidate values ​​with time information corresponding to each candidate value.(Supplementary Note 51) The program according to Supplementary Note 45, wherein the transmission resource upper limit value is a bandwidth upper limit value or a transmission power upper limit value. (Supplementary Note 52) A program causing an RU (Radio Unit) device to execute processing, wherein the RU device has a radio unit including a peak power reduction unit that reduces peak power of a transmission radio signal based on a set threshold, and a power amplifier that amplifies the transmission radio signal, and the processing includes: acquiring a designation message that is a designated value of a transmission resource upper limit value actually used in the system and includes information on a designated value that is common to a DU (Distributed Unit) device; setting the threshold value based on the designated value, and controlling amplification characteristics of the power amplifier based on the designated value. (Supplementary Note 53) The program according to Supplementary Note 52, wherein the controlling includes controlling the amplification characteristics by controlling a drain current of the power amplifier. (Supplementary Note 54) The program according to Supplementary Note 53, wherein the controlling includes controlling the drain current by controlling a gate voltage of the power amplifier. (Supplementary Note 55) The program according to any one of Supplementary Notes 52 to 54, wherein the controlling includes controlling a bias of the power amplifier based on the specified value. (Supplementary Note 56) The program according to any one of Supplementary Notes 52 to 54, wherein the obtaining includes receiving a specification message including, as information related to the specified value, the specified value or an indicator indicating the specified value. (Supplementary Note 57) The program according to Supplementary Note 56, wherein the specification message further includes, as information related to the specified value, information indicating a start time of application of the specified value and a duration for which application of the specified value will continue. (Supplementary Note 58) The program according to Supplementary Note 57, wherein the information indicating the start time of application of the specified value is a time parameter in which the absolute time of the specified value is expressed using at least a System Frame Number (SFN). (Supplementary Note 59) The program according to Supplementary Note 52, wherein the transmission resource upper limit value is a bandwidth upper limit value or a transmission power upper limit value.(Supplementary Note 60) A program for causing a DU (Distributed Unit) device to execute processing, the program comprising: acquiring a designation message including information on a designated value that is a designated value of a transmission resource upper limit actually used in a system and is common to RU (Radio Unit) devices; and controlling the number of frequency resources to be used in the system based on the designated value. (Supplementary Note 61) The program according to Supplementary Note 60, wherein the acquiring includes receiving a designation message including, as information on the designated value, the designated value or an indicator indicating the designated value. (Supplementary Note 62) The program according to Supplementary Note 61, wherein the designation message further includes, as information on the designated value, information indicating a start time of application of the designated value and a duration for which application of the designated value will continue. (Supplementary Note 63) The program according to Supplementary Note 62, wherein the information indicating the start time of application of the designated value is a time parameter in which the absolute time of the designated value is expressed using at least a System Frame Number (SFN). (Supplementary Note 64) The program according to Supplementary Note 60, wherein the transmission resource upper limit is a bandwidth upper limit or a transmission power upper limit. (Supplementary Note 65) The program according to Supplementary Note 60, wherein the processing includes: forming a second designation message based on the acquired designation message; and transmitting the second designation message to the RU device. (Supplementary Note 66) The program according to Supplementary Note 65, wherein the second designation message is a C (Control)-Plane message, includes an information element capable of specifying a Section Type of information transmitted by the C-Plane message, holds a first Section Type value in the information element indicating that the transmitted information is the transmission resource upper limit value, and a transmission interval of a C-Plane message of the first Section Type indicated by the first Section Type value is longer than a transmission interval of a C-Plane message of a Section Type other than the first Section Type.

[0089] This application claims priority based on Japanese Patent Application No. 2024-129627, filed August 6, 2024, the disclosure of which is incorporated herein by reference in its entirety.

[0090] REFERENCE SIGNS LIST 1 Communication system 10 Control device 11 Forming unit 12 Designation unit 20 DU (Distributed Unit) device 21 Acquisition unit 22 Control unit 30 RU (Radio Unit) device 31 Acquisition unit 32 Control unit 35 Radio unit 36 ​​Peak power reduction unit 37 Power amplifier 40 Control device 41 Determination unit 42 Forming unit 43 Designation unit 50 DU device 51 Acquisition unit 52 Control unit 53 Forming unit 54 Transmission unit 60 RU device 61 Interface unit 62 Control unit 63 Baseband unit 64 Radio unit 64A Filter unit 64B Frequency conversion unit

Claims

1. A control device comprising: a forming unit that forms a designation message including information regarding a designated value of the transmission resource upper limit value actually used in the system; and a designation unit that transmits the designation message to at least one of a DU (Distributed Unit) device or an RU (Radio Unit) device.

2. The control device according to claim 1, wherein the forming unit forms the specification message including the specified value or an indicator indicating the specified value as information relating to the specified value.

3. The control device according to claim 2, wherein the forming unit further includes in the specification message, as information relating to the specified value, information indicating the start time of application of the specified value and a duration for which application of the specified value will continue.

4. The control device according to claim 3, wherein the information indicating the application start time of the designated value is a time parameter in which the absolute time of the application start time is expressed using at least a System Frame Number (SFN).

5. The control device according to claim 1, further comprising a determination unit that determines the designated value from among a plurality of candidate values ​​for the transmission resource upper limit value.

6. The control device according to claim 5, wherein the determination unit holds a correspondence relationship that associates the plurality of candidate values ​​with time information corresponding to each candidate value, and determines the candidate value that is associated with the time information corresponding to the current time in the correspondence relationship as the specified value.

7. The control device according to claim 1, wherein the transmission resource upper limit value is a bandwidth upper limit value or a transmission power upper limit value.

8. A RU (Radio Unit) device comprising: a radio unit including a peak power reduction unit that reduces the peak power of a transmitted radio signal based on a set threshold and a power amplifier that amplifies the transmitted radio signal; an acquisition unit that acquires a specification message that includes information on a specified value that is a specified value for the upper limit of transmission resources actually used in the system and is common to a DU (Distributed Unit) device; and a control unit that sets the threshold based on the specified value and controls the amplification characteristics of the power amplifier based on the specified value.

9. A DU (Distributed Unit) device comprising: an acquisition unit that acquires a designation message that is a designated value for the upper limit of transmission resources actually used in the system and includes information about a designated value that is common to RU (Radio Unit) devices; and a control unit that controls the number of frequency resources used in the system based on the designated value.

10. A control method executed by a control device, comprising: forming a designation message including information regarding a designated value of a transmission resource upper limit value actually used in the system; and transmitting the designation message to at least one of a DU (Distributed Unit) device or an RU (Radio Unit) device.

11. A program that causes a control device to perform processing including: forming a specification message including information regarding a specified value of the upper limit of transmission resources actually used in the system; and transmitting the specification message to at least one of a DU (Distributed Unit) device or an RU (Radio Unit) device.

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