Wireless communication device, wireless communication system, wireless beam allocation method, and wireless beam allocation program

Abstract

To optimize a beam table.SOLUTION: A DU 101 performs radio resource management in an RU 103 that performs radio communication with UE 104 using a predetermined beam. The DU 101 includes a memory that stores a beam table 120 in which a terminal 104 accommodated in each of a plurality of beams is set, and a resource management unit 130 that manages the beam table 120. During system operation, the resource management unit 130 determines pieces of UE 5, 6 (104) movable between beam tables 120 and the beam table 120 capable of accommodating the movable pieces of UE 5, 6 (104), moves the movable pieces of UE 5, 6 (104) to the other beam table 120, and adjusts the number of pieces of UE 104 accommodated in each of the plurality of beam tables 120.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wireless communication device, a wireless communication system, a radio beam allocation method, and a radio beam allocation program. [Background technology]

[0002] In 5G (5th Generation) mobile communication systems, the nodes that make up the RAN are classified into CU, DU, and RU. RAN stands for Radio Access Network, CU for Central Unit, DU for Distributed Unit, and RU for Remote Unit.

[0003] The DU and RU are connected via a fronthaul interface, and the DU controls the RU, which has a radio. The RU can control directional beams by controlling the phase and amplitude of the antenna. However, there are restrictions on the mobile terminals (UE: User Equipment) that can be accommodated in each RU beam. Due to these restrictions, if the DU cannot assign the UE to the optimal beam when determining which beam to accommodate it, high-quality service to the user will be hindered.

[0004] Prior art beam allocation techniques include, for example, a technique in which a base station measures the signal reception quality for each transmission beam from a terminal, groups the beams by antenna unit, and controls the power of the terminal's transmission beam on a beam-by-beam basis. Another technique is, for example, a technique in which a base station predicts the beam group for transmitting data to a terminal based on the terminal's movement tendency. Another technique is, for example, a technique in which a base station transmits beamformed candidate beams to a terminal, receives identification information and reception power information of beams whose reception power measured by the terminal for each of multiple measurement blocks meets predetermined conditions, and selects an appropriate beam. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2019 / 155578 [Patent Document 2] Japanese Patent Publication No. 2020-156074 [Patent Document 3] Japanese Patent Application Publication No. 2020-053897 Summary of the Invention [Problem to be solved by the invention]

[0006] In the conventional technology, if the resources used for a service are unavailable due to congestion, the UE is denied service access. For example, if the number of UEs that can be accommodated in the beam ID table of a DU reaches its upper limit, it becomes impossible to assign new UEs to the beam ID table that has reached its upper limit, and it becomes impossible to reallocate UEs to other beam ID tables.

[0007] Improving user satisfaction is essential for all mobile communication operators, and it is important to always accept the services required by UE users. However, there are cases where the wireless quality of UEs actually using services deteriorates, making it desirable to reassign them to another beam ID. Conventional technologies were unable to perform beam table management that optimizes the accommodation of UEs in the beam ID table in response to congestion, fluctuations in wireless quality, etc.

[0008] In one aspect, the present invention aims to be able to optimize the beam table. [Means for solving the problem]

[0009] According to one aspect of the present invention, a wireless communication device that performs wireless resource management at a base station that performs wireless communication with a terminal using a predetermined beam includes a beam table in which the terminals to be accommodated in each of multiple beams are set, and a resource management unit that manages the beam table, wherein the resource management unit, during system operation, determines terminals that can be moved between the beam tables and other beam tables that can accommodate the movable terminals, moves the movable terminals to the other beam tables, and adjusts the number of terminals accommodated by each of the multiple beam tables. [Effects of the Invention]

[0010] Advantageous Effects of Invention According to one aspect of the present invention, an advantage is achieved in that the beam table can be optimized. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of a configuration of a wireless communication system according to an embodiment. [Figure 2] FIG. 2 is a block diagram showing an example of the functional configuration of the DU and the RU. [Figure 3] FIG. 3 is a diagram illustrating an example of the hardware configuration of a DU. [Figure 4] FIG. 4 is a flowchart of an example of a periodic resource reallocation process. [Figure 5] FIG. 5 is a flowchart of an example of a process for immediately allocating resources to a UE making a new connection request. [Figure 6] FIG. 6 is a flowchart of an example process for immediate resource reallocation for a UE requiring beam switching. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, with reference to the drawings, embodiments of the disclosed wireless communication device, wireless communication system, wireless beam allocation method, and wireless beam allocation program will be described in detail.

[0013] (An example of a radio beam allocation method according to an embodiment) 1 is a diagram illustrating an example of the configuration of a wireless communication system according to an embodiment. The wireless communication system 100 includes a DU 101, which is a wireless communication device according to the embodiment, a CU (control station) 102, a RU (base station) 103, and a UE (terminal) 104.

[0014] The DU 101 and the RU 103 are connected by an interface (IF) of the fronthaul 111. The DU 101 and the RU 103 transmit and receive control signals and data signals via the fronthaul 111. The RU 103 transmits and receives RF (Radio Frequency) signals to and from the UE 104 via an antenna.

[0015] A plurality of DUs 101 are connected to a CU 102 via an IF of an F1AP (F1 Application Protocol) 112. The DUs 101 and CU 102 transmit and receive control signals and data signals via the F1AP 112. The CU 102 is connected to an external core network 115 via an IF of an NGAP (NG Application Protocol) 113.

[0016] DU101 manages beam table 120 for each subordinate RU103. Beam table 120 manages UE104 assigned to each beam of RU103. Beam table 120 has n records 120-1 to 120-n for beams #1 to #n. The n records 120-1 to 120-n correspond to n beam tables 120. For example, each of the n beam tables 120 has a different beam radiation direction. RU103 transmits beams to UE104 based on the settings and control of beam table 120 of DU101.

[0017] There is a limit to the number of beams that can be controlled by one RU103 antenna, with n being a maximum of 8 beams in the 5G Sub6 band and 64 beams in the mmW band.

[0018] The number of UEs 104 that each of the n beam tables 120 (120-1 to 120-n) can accommodate is limited by resource restrictions. For convenience, FIG. 1 shows an example in which the number of UEs 104 that can be accommodated per beam table 120 (e.g., 120-1) is three. In this case, for example, beam table 120-1 already accommodates three UEs 104 (UE1, UE4, UE6), and even if a new or moving UE 104 that corresponds to beam #1 appears, there is no room to accommodate it.

[0019] In the embodiment, in a configuration in which the resources of the beam table 120 are finite and the number of beams is limited, the DU 101 reallocates beams to the multiple beam tables 120 and optimizes the beam tables 120.

[0020] The DU 101 performs the following processes (1) to (3) as optimization processes for the beam table 120, which is a resource. The DU 101 performs process (1) at predetermined intervals during system operation, and processes (2) and (3) are performed individually at the respective timings (triggered) during the operation of (1).

[0021] (1) Periodic resource reallocation The DU 101 periodically checks the reception quality based on a report from the UE 104, for example, the SIR (Signal to Interference Radio) of the downlink reference signal. When the DU 101 detects that the reception quality is lower than a threshold (first threshold) at which stable reception is possible and that the reception quality has deteriorated, the DU 101 executes reallocation control for the UE 104 present in the corresponding beam table 120.

[0022] For example, the DU 101 sets a threshold value for the reception quality (level) at which the beam can be regarded as being capable of being used stably for each beam of the UE 104. Then, for example, the DU 101 moves the UE 104 to be reallocated to another beam table 120 that can ensure stable reception quality.

[0023] More specifically, the DU 101 determines the number of UEs to be reallocated based on the usage rate of the corresponding beam table 120, and selects UEs 104 to be reallocated and performs reallocation until a certain usage rate is reached. When selecting UEs 104 to be reallocated, the DU 101 checks the UEs 104 in the DRX state, the availability of the beam tables 120 of the candidates for reallocation, or the usage history of the beam tables 120 of the candidates for reallocation. DRX is an abbreviation for Discontinuous Reception.

[0024] The state of the UE 104 is, for example, Active, Inactive, or DRX. Active indicates a state in which the UE 104 is allocated uplink and downlink resources and is able to communicate. Inactive indicates a dormant state of the RRC layer and NAS layer, including RRC_INACTIVE. DRX indicates a state in which some functions are suspended while no signals are being received, by receiving signals intermittently to reduce device energy consumption.

[0025] When selecting a UE 104 to be reallocated, DU 101 prioritizes UE 104 that is in the DRX state, that is being moved to a beam table 120 with many available reallocation candidates, or that is being moved to a beam table 120 with no history of allocation as a reallocation candidate.

[0026] For example, suppose that the DU 101 checks the UE states in the beam table 120 and finds that there are UEs 104 in both the Active state and the DRX state. Since the DRX state is a sleep state due to discontinuous reception in which data communication is suppressed more than in the Active state, the DU 101 preferentially determines the UE 104 in the DRX state as the UE 104 to be reallocated.

[0027] After a UE 104 to be reallocated is selected, if there is a beam that can ensure more stable reception quality than the beam currently being used, based on the measurement results reported by the UE 104, the DU 101 decides to move to that beam. Then, it checks the availability of the other beam tables 120 determined as candidates, and if there is availability, it performs reallocation. If there is no availability, it selects another UE 104 as the next candidate and performs the reallocation process again. Then, the DU 101 repeats the reallocation process until each of the n beam tables 120 reaches a certain usage rate, thereby maintaining reception quality and equalizing the congestion state.

[0028] For example, FIG. 1 shows an example in which the resource management unit 130 of the DU 101, which manages the resources of the beam table 120, targets UE 104 in the DRX state for reallocation. In this case, it is assumed that the resource management unit 130 detects UE 6 in the DRX state in beam table 120-1 of beam #1, which has no room in the UE accommodation limit. In this case, the resource management unit 130 moves UE 6 to the beam table 120 of a beam that can ensure stable reception quality among the other beams #2 to #n, for example, beam #2 (beam table 120-2). The resource management unit 130 also detects UE 5 in the DRX state in beam table 120-2 of beam #2. In this case, the resource management unit 130 moves UE 5 to, for example, beam #n (beam table 120-n). As a result, the DU 101 makes adjustments to equalize the utilization rates (number of UEs) of each of the n beam tables 120.

[0029] Furthermore, when there are multiple UEs 104 to be reallocated, DU 101 may preferentially reallocate UEs 104 that can be moved to other beam tables 120 with a large available capacity among other beam tables 120 that can be reallocated. Furthermore, when there are multiple UEs 104 to be reallocated, DU 101 may preferentially reallocate UEs 104 that can be moved to beam tables 120 that have not been reallocated before, based on the beam usage history of the UEs 104 to be reallocated. Furthermore, when there are multiple UEs 104 to be reallocated, DU 101 may check the reception quality of the UEs 104 to be reallocated, and preferentially reallocate UEs 104 with the lowest reception quality.

[0030] This periodic resource reallocation process can also be performed by connecting a verification tool 140 to the DU 101, as shown in Fig. 1. When performing verification in a field trial, system test, or the like conducted by a mobile communications carrier or a vendor, a tester may use the verification tool 140 and input the intended downlink reception quality from the verification tool to the DU 101. In this way, in the periodic resource reallocation process, instead of receiving a notification of reception quality from the UE 104, information on the reception quality intended by the tester is input from the verification tool 140 to the DU 101. This enables efficient testing to be performed without measuring the reception quality of the UE 104 in the actual wireless section.

[0031] This periodic resource reallocation process can also be performed using the fronthaul analysis unit 150, which is a general-purpose tool for analyzing the fronthaul 111 between the RU 103 and the DU 101. The fronthaul analysis unit 150 inputs information in which the notified reception quality is overwritten with the reception quality intended by the tester to the DU 101. This enables efficient testing without using the reception quality of the UE in the actual wireless section.

[0032] (2) Immediate resource allocation for a UE 104 requesting a new connection The periodic interval for reallocating resources according to (1) above can be set arbitrarily from short to long depending on the operational conditions. Therefore, if the periodic interval is long, a connection request from a new UE 104 may occur before the beam table 120 is equalized, and at that time, the beam table 120 may not have room to accommodate the new UE 104.

[0033] In response to this, the DU 101, upon receiving a connection request from the UE 104, checks the reception quality of the UE 104 present in the beam table 120, and performs reallocation on the UE 104 whose reception quality is lower than a threshold value as a reallocation candidate.

[0034] On the other hand, even when the periodic interval is short, there may be no available resources in the beam table 120. This occurs when there is no UE 104 below the threshold used to check the downlink reference signal. In this case, if a connection to a UE 104 that newly requests connection is rejected, there is a risk of a decrease in service satisfaction.

[0035] For this reason, in the embodiment, the DU 101 sets the threshold to a plurality of different levels. (2) In the process of immediate resource allocation for a UE 104 that newly requests connection, the DU 101 uses a threshold (second threshold) that is higher than the threshold (first threshold) that allows stable reception and is used in the periodic resource reallocation process (1) (first threshold<second threshold). For example, the SIR of the second threshold is higher than the SIR of the first threshold. Then, the DU 101 sets a plurality of second thresholds to be used for checking the reception quality, gradually increasing the level from the lowest to higher levels, and targets the UE 104 with the best reception quality as the target for reallocation.

[0036] Furthermore, when selecting a UE 104 to be reallocated, the DU 101 checks the UE 104 in the DRX state, the availability of the beam table 120 of the reallocation candidate, or the usage history of the beam table 120 of the reallocation candidate.The DU 101 may then prioritize UE 104 in the DRX state, UE 104 that has been moved to a beam table 120 with a lot of availability as a reallocation candidate, or UE 104 that has been moved to a beam table 120 that has no allocation history as a reallocation candidate.

[0037] For example, in the example of FIG. 1, the resource management unit 130 of the DU 101, which manages the resources of the beam table 120, assumes that the beam for the new UE 7 is beam #1 (beam table 120-1), which has no room in the UE accommodation limit. In this case, the resource management unit 130 reassigns the UE 6 in the DRX state in the beam table 120-1 to the beam table 120 of one of the other beams #2 to #n that can ensure stable reception quality, for example, beam #2 (beam table 120-2). Furthermore, the resource management unit 130 moves the UE 5 in the DRX state in the beam table 120-2 to the beam table 120 of one of the other beams #1, #3 to #n that can ensure stable reception quality, for example, beam #n (beam table 120-n). Then, the resource management unit 130 assigns the new UE 7 to beam #1 (beam table 120-1). This allows the DU 101 to immediately assign resources to the UE 7 (104) that newly requests connection.

[0038] This (2) immediate resource allocation process for a UE 104 making a new connection request can also be performed by connecting a verification tool 140 to the DU 101, as shown in Fig. 1. In this case, the verification tool 140 controls the beam table 120 to be allocated to intentionally put it into a full state, which means that there is no room, in order to verify that there is no room in the beam table 120 to be allocated.

[0039] (3) Immediate resource reallocation for UE 104 requiring beam switching The periodic interval for the periodic resource reallocation according to (1) above can be set arbitrarily from short to long depending on the operational conditions. Therefore, if the periodic interval is long, there is a possibility that the existing UE 104 will switch to another beam due to deterioration in the quality of the beam currently being used before the beam table 120 is uniformed.

[0040] In response to this, the DU 101, upon receiving a connection request from the UE 104, checks the reception quality of the UE 104 present in the corresponding beam table 120, and controls the UE 104 with reception quality lower than a threshold as a reallocation candidate.

[0041] On the other hand, even when the periodic interval is short, there may be no available resources in the beam table 120. This occurs when there is no UE 104 below the threshold used to check the reference signal. In this case, even if a switch to another beam occurs due to deterioration in the quality of the beam currently being used by an existing UE 104, the beam switch for this UE 104 is not performed, making it difficult to continue service for the UE. If a service interruption occurs, there is a risk of a decrease in service satisfaction.

[0042] In response to this, in the embodiment, the DU 101 sets the threshold to a plurality of different stages. In the (3) immediate resource reallocation process for the UE 104 that requires beam switching, the DU 101 uses a threshold (second threshold) at a higher level than the threshold (first threshold) used in checking the downlink reference signal in the (1) periodic resource reallocation process. Then, the DU 101 raises the second threshold used in checking the reception quality from the lowest level to a higher level in stages, and targets the UE 104 with the best reception quality for reallocation.

[0043] Furthermore, when selecting a UE 104 to be reallocated, the DU 101 checks the UE 104 in the DRX state, the availability of the beam table 120 of the reallocation candidate, or the usage history of the beam table 120 of the reallocation candidate.The DU 101 may then prioritize UE 104 in the DRX state, UE 104 to be moved to a beam table 120 of the reallocation candidate with a large amount of availability, or UE 104 to be moved to a beam table 120 of the reallocation candidate with no history of allocation.

[0044] For example, in the example of Fig. 1, assume that UE2 in beam table 120-2 of beam #2 needs to be switched to beam table 120-1 of beam #1, which has no room in the UE accommodation limit. In this case, the resource management unit 130 of DU 101 moves UE6 in the DRX state in beam table 120-1 of beam #1 to beam #2 (beam table 120-2) among the other beams #2 to #n, which can ensure stable reception quality. In this way, the resource management unit 130 can move UE2 that needs to be switched to beam #1 (beam table 120-1).

[0045] This (3) immediate resource reallocation process for UE 104 requiring beam switching can also be performed by connecting a verification tool 140 to DU 101, as shown in Fig. 1. In this case, the verification tool 140 controls the beam table 120 to be allocated to be intentionally set to Full in order to verify that there is not enough available space in the beam table 120 to be allocated.

[0046] As described above, the DU 101 of the embodiment periodically compares the reception quality of the downlink reference signal of the UE 104 present in the beam table 120 with a threshold, and if the reception quality is below the threshold, selects a beam with a more stable and higher reception quality based on the measurement results of the UE 104. Then, the DU 101 executes a process of reallocating the UE 104 to the selected beam table 120. This makes it possible to optimize the beam table 120 of the DU 101. At the same time, the RU 103 can optimize the UE 104 that is unnecessarily occupying a limited number of beams, realizing network operation that makes it easier for new UEs 104 to connect, thereby improving user satisfaction.

[0047] Furthermore, the verification tool 140 connected to the DU 101 can directly set the state of the UE 104 and information on the beam table 120 in which the UE 104 is placed in the DU 101, so that the tester can perform the intended test. For example, the state of the UE 104 set in the beam table 120 may be changed to Active or DRX by operating the verification tool 140. This allows the verification tool 140 to control the priority of the UE 104 to be reassigned, and the number of UEs 104 accommodated in the beam table 120 to be controlled by changing, adding, or deleting the information of the UE 104 set in the beam table 120.

[0048] (Example of functional configuration of wireless communication device) 2 is a block diagram showing an example of the functional configuration of a DU and an RU. The DU 101 is an upper node of the RU 103. The RU 103 is a lower node of the DU 101.

[0049] The DU 101 includes a memory 201 , a beam table management unit 202 , a reference signal calculation unit 203 , a reallocation determination unit 204 , and a lower-level IF unit 205 .

[0050] The beam table management unit 202 is connected to the memory 201, the reference signal calculation unit 203, and the reallocation determination unit 204. The beam table management unit 202 manages in the memory 201 the UE information of the UE 104 in the beam table 120 allocated for each beam.

[0051] The reference signal calculation unit 203 is connected to the memory 201, the beam table management unit 202, and the lower IF unit 205. The reference signal calculation unit 203 calculates the reception quality of the reference signal acquired from the RU 103, for example, the SIR, and outputs the result to the memory 201.

[0052] The memory 201 is connected to the beam table management unit 202, the reference signal calculation unit 203, and the reallocation determination unit 204. The memory 201 holds downlink reference signal information notified from the RU 103 and information on the beam table 120 managed by the DU 101.

[0053] The reallocation determination unit 204 is connected to the memory 201 and the beam table management unit 202. The reallocation determination unit 204 performs a reallocation determination at every predetermined period to determine whether or not to switch to another beam UE 104 whose downlink reference signal has deteriorated below a predetermined threshold and whose usage rate of the corresponding beam table 120 in the memory 201 is congested. The lower IF unit 205 terminates the interface of the fronthaul 111 connected to the RU 103, and outputs a downlink reference signal to the reference signal calculation unit 203.

[0054] Although not shown in Fig. 2, the DU 101 includes the resource management unit 130 shown in Fig. 1. This resource management unit 130 controls various resources of the DU 101. In the embodiment, the resource management unit 130 includes management of the beam table 120 by the beam table management unit 202 and processing of reallocation determination by the reallocation determination unit 204, thereby optimizing the beam table 120.

[0055] The RU 103 includes a memory 211 , a beam table management unit 212 , a reference signal acquisition unit 213 , and a higher-order IF unit 214 .

[0056] The reference signal acquisition unit 213 is connected to the memory 211 and the upper IF unit 214. The reference signal acquisition unit 213 reads out the reference signal in the RU 103 and outputs it to the upper IF unit 214. The beam table management unit 212 is connected to the memory 211 and the upper IF unit 214. The beam table management unit 212 manages the UE information of the UE 104 in the beam table 120 assigned to each beam on the memory 211. The upper IF unit 214 terminates the interface of the fronthaul 111 connecting to the DU 101 and outputs the reference signal to the DU 101. The memory 211 holds the reference signal information acquired by the RU 103 and the information of the beam table 120 assigned by the DU 101.

[0057] (Example of hardware configuration of wireless communication device) 3 is a diagram showing an example of the hardware configuration of a DU. The DU 101, which is a wireless communication device, has a processor 301 such as a CPU (Central Processing Unit), a memory 302, a network IF 303, a recording medium IF 304, and a recording medium 305. The components are connected to each other via a bus 300.

[0058] Here, the processor 301 is a control unit that controls the entire DU 101. The processor 301 may have multiple cores. The memory 302 includes, for example, a read-only memory (ROM), a random access memory (RAM), and a flash ROM. Specifically, for example, the flash ROM stores a control program, the ROM stores an application program, and the RAM is used as a work area for the processor 301. The programs stored in the memory 302 are loaded into the processor 301, causing the processor 301 to execute the coded processes.

[0059] The network IF 303 is connected to the network NW via a communication line, and is connected to other communication devices via the network NW. The other communication devices are, for example, the CU 102 and the RU 103 shown in FIG. 1, and the network NW corresponds to, for example, the F1AP (112) and the fronthaul (111) networks. The network IF 303 manages the interface between the network NW and the inside of the device, and controls the input and output of data from the other communication devices.

[0060] The recording medium IF 304 controls reading / writing of data from / to the recording medium 305 under the control of the processor 301. The recording medium 305 stores the data written under the control of the recording medium IF 304.

[0061] In addition to the above-mentioned components, the DU 101 may be configured to be connectable to, for example, an input device, a display, etc. via an IF.

[0062] By executing a program, the processor 301 shown in Fig. 3 can realize the functions of the beam table management unit 202, reference signal calculation unit 203, and reallocation determination unit 204 of the DU 101 shown in Fig. 2. Furthermore, the network IF 303 shown in Fig. 3 corresponds to the lower IF unit 205 of the DU 101 shown in Fig. 2. Furthermore, the beam table 120 shown in Fig. 1 can be configured using the memory 201 shown in Fig. 2, and the memory 302 and recording medium 305 shown in Fig. 3.

[0063] RU 103 and CU 102 can also be configured using hardware similar to that shown in Fig. 3. The functions of the beam table management unit 212 and reference signal acquisition unit 213 of RU 103 shown in Fig. 2 can be realized by executing a program in processor 301 shown in Fig. 3. Furthermore, network IF 303 shown in Fig. 3 corresponds to upper IF unit 214 of RU 103 shown in Fig. 2. Furthermore, memory 211 shown in Fig. 2 can be configured using memory 302 and recording medium 305 shown in Fig. 3.

[0064] (Example of beam table optimization processing) Next, an example of optimization processing of the beam table 120, which is a resource performed by the DU 101, will be described.

[0065] (1) Periodic resource reallocation process Fig. 4 is a flowchart of an example of periodic resource reallocation processing. The processing shown in Fig. 4 is performed by the control unit (processor 301) of the DU 101 at predetermined intervals during operation of the wireless communication system 100. First, the DU 101 measures a report from the UE 104, for example, a downlink reference signal (step S401). For example, the DU 101 measures reception quality based on the SIR.

[0066] Next, the DU 101 determines whether the SIR of the downlink reference signal is below the threshold value (step S402). If the determination result shows that the SIR of the downlink reference signal is below the threshold value at which stable reception is possible (step S402: Yes), the DU 101 proceeds to the process of step S403. On the other hand, if the SIR of the downlink reference signal is not below the threshold value (step S402: No), the DU 101 ends the above process.

[0067] In step S403, the DU 101 reads the selection history of the beam table 120 (S403). Next, the DU 101 reselects the beam table 120 (step S404).

[0068] In steps S403 and S404, DU101 can prioritize UE104 for reallocation that is in the DRX state, that is being moved to a beam table 120 with many available reallocation candidates, or that is being moved to a beam table 120 that has no history of reallocation among the reallocation candidates. For example, in the processing example of Figure 4, if there are multiple UE104 to be reallocated, DU101 prioritizes UE104 that can be moved to a beam table 120 that has no history of reallocation based on the beam usage history of the UE104 to be reallocated.

[0069] Next, DU 101 determines whether or not there is a vacant beam table 120 to be reselected (step S405). If the determination result in step S405 is that there is a vacant beam table 120 to be reselected (step S405: Yes), DU 101 proceeds to the processing of step S406. On the other hand, if there is no vacant beam table 120 to be reselected (step S405: No), DU 101 returns to the processing of step S402.

[0070] In step S406, the DU 101 assigns the target UE 104 to the new beam table 120 (step S406). Next, the DU 101 releases the resources of the original beam table 120 of the target UE 104 (step S407), and ends the above processing.

[0071] In the periodic resource reallocation process shown in Figure 4, if the reception quality of the downlink reference signal is lower than a set threshold, DU101 performs reallocation control for UE104 present in the corresponding beam table 120 based on the deterioration of the reception quality. When reallocating a beam table 120, DU101 checks, for example, UE104 in DRX state, the availability of the beam table 120 that is a candidate for reallocation, or the usage history of the beam table 120 that is a candidate for reallocation. Then, DU101 prioritizes UE104 that is in DRX state, has been moved to a beam table 120 that is a candidate for reallocation and has been moved to a beam table 120 that is a candidate for reallocation and has no history of allocation.

[0072] After the UE 104 to be reallocated is selected, if there is a beam that can ensure more stable reception quality than the currently used beam based on the measurement results reported by the UE 104, the DU 101 decides to move the UE 104 to the beam. Then, it checks the availability of the other beam tables 120 determined as candidates, and if there is availability, it executes reallocation. If there is no availability, it selects another UE 104 as the next candidate and executes the reallocation process again. Then, the DU 101 repeats the reallocation process until each of the n beam tables 120 reaches a certain usage rate. In this way, the DU 101 can equalize the usage rates (number of UEs) of each of the n beam tables 120 at a predetermined period.

[0073] 4, the measurement of the downlink reference signal by the DU 101 may be started by notifying the DU 101 of a downlink reference signal at a level appropriate for the test item using the verification tool 140. In this case, information on the reception quality intended by the tester is input to the DU 101 from the verification tool 140. This enables efficient testing to be performed without using the reception quality of the UE 104 in question in the actual wireless section.

[0074] 4, the measurement of the downlink reference signal by the DU 101 may be started by notifying the DU 101 of a downlink reference signal at a level appropriate for the test item using the fronthaul analysis unit 150. In this case, the fronthaul analysis unit 150 inputs information in which the notified reception quality is overwritten with the reception quality intended by the tester to the DU 101. This enables efficient testing without using the reception quality of the UE in the actual wireless section.

[0075] (2) Immediate resource allocation process for a UE 104 requesting a new connection Fig. 5 is a flowchart of an example of a process of real-time resource allocation to a UE making a new connection request. The process shown in Fig. 5 is performed by the control unit (processor 301) of the DU 101 every time a new UE 104 accesses during the operation of the wireless communication system 100 shown in Fig. 4. When selecting a beam to be reallocated, the process shown in Fig. 5 responds to a new connection request from the UE 104 within a periodic interval.

[0076] First, when a new UE 104 accesses the DU 101 (step S501), the DU 101 performs a resource allocation process for the new UE 104 (step S502). This resource allocation process includes a beam selection process.

[0077] Then, DU 101 determines whether there is room in the UE accommodation limit of the beam table 120 to which new UE 104 is assigned (step S503). If the determination result of step S503 shows that there is room in the UE accommodation limit of the beam table 120 to which new UE 104 is assigned (step S503: Yes), DU 101 proceeds to processing of step S511. On the other hand, if there is no room in the UE accommodation limit of the beam table 120 to which new UE 104 is assigned (step S503: No), DU 101 proceeds to processing of step S504.

[0078] In step S504, the DU 101 determines whether or not there is a DRX UE 104 in the beam table 120 of the corresponding allocation destination (step S504). If the determination result in step S504 is that there is a DRX UE 104 in the corresponding beam table 120 (step S504: Yes), the DU 101 proceeds to processing in step S508. On the other hand, if there is no DRX UE 104 in the corresponding beam table 120 (step S504: No), the DU 101 proceeds to processing in step S505.

[0079] In step S505, the DU 101 selects an Active UE 104 to be reallocated (step S505). Next, the DU 101 allocates this Active UE 104 to another beam table 120 (step S506). Next, the DU 101 releases the resources of the beam table 120 to which the UE 104 has been allocated (step S507), and proceeds to the processing of step S511.

[0080] In step S508, the DU 101 selects the DRX UE 104 to be reallocated (step S508). Next, the DU 101 allocates this DRX UE 104 to another beam table 120 (step S509). Next, the DU 101 releases the resources of the beam table 120 to which the UE 104 is allocated (step S510), and proceeds to the processing of step S511.

[0081] In step S511, the DU 101 allocates the new UE 104 to the corresponding allocation beam table 120 (step S511), and ends the above processing.

[0082] In the process shown in Fig. 5, when selecting UE 104 to be reallocated in steps S505 and S508, DU 101 uses a threshold (second threshold) that is higher than the threshold (first threshold) used in the periodic resource reallocation process shown in Fig. 4. Then, in the processes of steps S505 and S508, DU 101 gradually increases the threshold used to check the reception quality from the lowest level to a higher level. Then, when DU 101 detects UE 104 to be reallocated, it executes reallocation control targeting that UE 104.

[0083] Also, in the process shown in Figure 5, when selecting a UE 104 to be reassigned, if there is no space in the beam table 120 of candidate reassignment destinations and there is no DRX UE 104, an Active UE 104 is selected in the process from step S505 onwards.

[0084] In this way, when selecting a UE 104 to be reallocated, DU 101 checks UEs in DRX state, the availability of beam tables 120 that are candidates for reallocation, or the usage history of beam tables 120 that are candidates for reallocation. DU 101 can then prioritize UEs in DRX state, UEs that have been moved to beam tables 120 that have a lot of available space in the candidates for reallocation, or UEs that have been moved to beam tables 120 that have no history of allocation to candidates for reallocation. This allows DU 101 to immediately allocate resources to a new UE 104, even if there is not enough space in beam table 120 to accommodate the UE 104 that is newly requesting connection.

[0085] 5 can also be started using the verification tool 140. In this case, the verification tool 140 performs control to intentionally set the beam table 120 to which the new UE 104 of the DU 101 is assigned to a full state, in order to verify that there is no available space in the beam table 120 to which the DU 101 is assigned. This makes it possible to perform an efficient test without using the reception quality of the UE 104 in question in the actual wireless section.

[0086] (3) Immediate resource reallocation for UE 104 requiring beam switching Fig. 6 is a flowchart of an example of a process for reallocating resources immediately to a UE that requires beam switching. The process shown in Fig. 6 is performed by the control unit (processor 301) of the DU 101 every time a UE 104 that requires beam switching occurs due to deterioration of reception quality or the like during the process of operating the wireless communication system 100 shown in Fig. 4. The process shown in Fig. 6 corresponds to beam switching of the UE 104 within a periodic interval when selecting a beam to be reallocated.

[0087] First, when the DU 101 detects a UE 104 in which downlink reference signal degradation has occurred (step S601), the DU 101 executes a resource allocation process for the UE 104 in which signal degradation has occurred (step S602). This resource allocation process includes a beam selection process.

[0088] Then, DU 101 determines whether there is room in the UE accommodation limit of the beam table 120 to which the signal has deteriorated for UE 104 (step S603). If the determination result of step S603 shows that there is room in the UE accommodation limit of the beam table 120 to which the signal has deteriorated for UE 104 (step S603: Yes), DU 101 proceeds to processing of step S611. On the other hand, if there is no room in the UE accommodation limit of the beam table 120 to which the signal has deteriorated for UE 104 (step S603: No), DU 101 proceeds to processing of step S604.

[0089] In step S604, the DU 101 determines whether or not there is a DRX UE 104 in the beam table 120 of the corresponding allocation destination (step S604). If the determination result in step S604 is that there is a DRX UE 104 in the corresponding beam table 120 (step S604: Yes), the DU 101 proceeds to processing in step S608. On the other hand, if there is no DRX UE 104 in the corresponding beam table 120 (step S604: No), the DU 101 proceeds to processing in step S605.

[0090] In step S605, the DU 101 selects an Active UE 104 to be reallocated (step S605). Next, the DU 101 allocates this Active UE 104 to another beam table 120 (step S606). Next, the DU 101 releases the resources of the beam table 120 to which the UE 104 has been allocated (step S607), and proceeds to the processing of step S611.

[0091] In step S608, the DU 101 selects the DRX UE 104 to be reallocated (step S608). Next, the DU 101 allocates this DRX UE 104 to another beam table 120 (step S609). Next, the DU 101 releases the resources of the beam table 120 to which the DU 101 is allocated (step S610), and proceeds to the processing of step S611.

[0092] In step S611, the DU 101 assigns the UE 104 requiring the beam switching to the corresponding assignment beam table 120 (step S611), and ends the above processing.

[0093] In the process shown in Fig. 6, when selecting UE 104 to be reallocated in steps S605 and S608, DU 101 uses a threshold (second threshold) that is higher than the threshold (first threshold) used in the periodic resource reallocation process shown in Fig. 4. Then, in the processes of steps S605 and S608, DU 101 gradually increases the threshold used to check reception quality from the lowest level to a higher level. Then, when DU 101 detects UE 104 to be reallocated, it executes reallocation control targeting that UE 104.

[0094] Also, in the process shown in Figure 6, when selecting a UE 104 to be reassigned, if there is no space in the beam table 120 of candidate reassignment destinations and there is no DRX UE 104, an Active UE 104 is selected in the process from step S605 onwards.

[0095] In this way, when selecting a UE 104 to be reallocated, DU 101 checks UEs in the DRX state, the availability of beam tables 120 that are candidates for reallocation, or the usage history of beam tables 120 that are candidates for reallocation. DU 101 can then prioritize UEs in the DRX state, UEs that are being moved to beam tables 120 that have a lot of availability among the candidates for reallocation, or UEs that are being moved to beam tables 120 that have no history of allocation among the candidates for reallocation. This allows DU 101 to immediately allocate resources to UE 104 that requires beam switching, even if there is no capacity in beam table 120 to accommodate UE 104 that has signal degradation and requires beam switching.

[0096] 6 can also be started using the verification tool 140. In this case, the verification tool 140 controls the beam table 120 to be assigned to the new UE 104 of the DU 101 to be intentionally set to a full state with no room to verify that there is no room in the beam table 120 to be assigned to. This makes it possible to perform an efficient test without using the reception quality of the UE 104 in the actual wireless section.

[0097] The wireless communication device according to the embodiment described above performs wireless resource management at a base station that performs wireless communication with a terminal using a predetermined beam. The wireless communication device includes a beam table in which terminals to be accommodated in each of multiple beams are set, and a resource management unit that manages the beam table. During system operation, the resource management unit determines terminals that can be moved between beam tables and other beam tables that can accommodate the movable terminals. The resource management unit moves the movable terminals to other beam tables. This allows adjustments to equalize the number of terminals accommodated in each of multiple beam tables. Furthermore, by moving UEs that are unnecessarily occupying a finite number of beams in a base station (RU) managed by the wireless communication device (DU) to other beams, network operation that is easy to connect to can be achieved, improving user satisfaction.

[0098] Furthermore, in the wireless communication device, the resource management unit periodically detects the reception quality of the downlink signal reported from each terminal. If there is a terminal whose downlink reception quality is equal to or less than a first threshold at which stable reception is possible, the resource management unit performs reallocation by moving the terminal to another beam table that satisfies the reception quality that allows continued communication. This makes it possible to optimize the beam table using the reception quality in a state where the reallocated terminal can continue communication.

[0099] In addition, the wireless communication device has a resource management unit that has a second threshold corresponding to a reception quality equal to or greater than the first threshold. If, during operation, a terminal requests connection via a specific beam and there is no room in the beam table corresponding to the beam of the terminal, the resource management unit determines the presence of a terminal with a downlink reception quality equal to or greater than the first threshold and equal to or less than the second threshold. The resource management unit reassigns the terminal to another beam table with which communication can continue, and assigns the terminal that made the connection request to the beam table of the corresponding beam. This allows terminals in operation with a second threshold higher than the first threshold to move to another beam table without a deterioration in reception quality, and allows the terminal that made the connection request to be immediately assigned to a beam table so that communication can be carried out.

[0100] In addition, the wireless communication device has a resource management unit that has a second threshold corresponding to reception quality equal to or greater than the first threshold. If, during operation, a terminal experiences a deterioration in the downlink reception quality of the currently used beam and there is no room in another beam table for the beam with which the terminal can continue communication, the resource management unit determines the presence of a terminal with downlink reception quality equal to or greater than the first threshold and equal to or less than the second threshold. The resource management unit reassigns the terminal to another beam table with which communication can continue, and assigns the terminal with deteriorated reception quality to a beam table with which communication can continue. This allows terminals currently in operation with a second threshold higher than the first threshold to move to another beam table and continue communication without a deterioration in reception quality.

[0101] Furthermore, if the resource management unit has no room in the beam table assigned to a terminal that has made a connection request or a terminal whose downlink reception quality has deteriorated, the wireless communication device checks the communication status of the terminals in that beam table and prioritizes reallocating terminals in the DRX state to other beam tables. Since the DRX state is a sleep state due to discontinuous reception in which data communication is suppressed more than the Active state, prioritizing the selection of UEs in the DRX state makes it possible to efficiently reallocate UEs.

[0102] Furthermore, when the resource management unit of the wireless communication device reallocates multiple terminals, the wireless communication device prioritizes reallocating terminals that can be moved to other beam tables with more available capacity among other beam tables that can be reallocated. In this way, when multiple terminals are selected as targets for reallocation processing, priority is given to reallocating terminals to beam tables with more available capacity, and by determining the terminals to be reallocated, congestion of the beam table to which the terminals are reallocated can be avoided.

[0103] Furthermore, when the resource management unit of the wireless communication device reallocates multiple terminals, it prioritizes reallocating terminals that can be moved to a beam table that has not been reallocated based on the beam usage history of each terminal that has been reallocated. In this way, when multiple terminals are selected as targets for reallocation processing, it is possible to avoid congestion of the beam table to which the terminals are reallocated by referring to the usage history of the selected beam table and prioritizing terminals that have not been allocated.

[0104] Furthermore, when the resource management unit of the wireless communication device reallocates multiple terminals, it checks the reception quality of each terminal and reallocates the terminal with the lowest reception quality first, thereby avoiding congestion in the beam table of the reallocation destination and enabling efficient reallocation processing.

[0105] Furthermore, a verification tool may be connected to the wireless communication device, and information corresponding to a predetermined reception quality of the terminal may be directly input from the verification tool. This allows the verification tool to be operated to easily perform beam table optimization processing without receiving a report of the reception quality of the downlink signal from the terminal.

[0106] In addition, the wireless communication device may have an analyzer connected to a communication interface with a base station, and information corresponding to a predetermined reception quality of the terminal may be input from the analyzer via the communication interface. This allows the analyzer to easily perform beam table optimization processing without receiving a report of the reception quality of the downlink signal from the terminal.

[0107] In addition, a verification tool is connected to the wireless communication device, and the information of each terminal accommodated in the beam table can be changed, added, or deleted from the verification tool. This makes it possible to control the priority of the terminals to be reallocated using the verification tool, and to control the number of terminals accommodated in the beam table by changing, adding, or deleting the information of the terminals set in the beam table.

[0108] The radio beam allocation method described in the embodiments of the present invention can be realized by causing a processor of a wireless communication device to execute a prepared program. This method is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM (Compact Disc-Read Only Memory), a DVD (Digital Versatile Disk), or a flash memory, and is executed by being read from the recording medium by a computer. This method may also be distributed via a network such as the Internet.

[0109] The following additional notes are provided regarding the above-described embodiment.

[0110] (Supplementary Note 1) A wireless communication device that performs wireless resource management in a base station that performs wireless communication with a terminal using a predetermined beam, a memory for storing a beam table in which the terminals to be accommodated in each of a plurality of beams are set; a resource management unit that manages the beam table; The resource management unit During operation of the system, determining a terminal that is movable between the beam tables and another beam table that can accommodate the movable terminal, respectively; A wireless communication device characterized in that the movable terminal is moved to another beam table, and the number of terminals accommodated by each of the plurality of beam tables is adjusted.

[0111] (Supplementary Note 2) The resource management unit Detecting the reception quality of the downlink signal reported from each terminal at predetermined intervals; A wireless communication device as described in Appendix 1, characterized in that if there is a terminal whose downlink reception quality is below a first threshold value that allows stable reception, the terminal is reassigned to move to another beam table that satisfies the reception quality that allows continued communication.

[0112] (Supplementary Note 3) The resource management unit a second threshold corresponding to a reception quality equal to or greater than the first threshold, During the operation, if a terminal requests connection via a predetermined beam and there is no room in the beam table corresponding to the beam of the terminal, determine whether there is a terminal in the beam table whose downlink reception quality is equal to or greater than the first threshold and equal to or less than the second threshold, and reallocate the terminal to another beam table with which communication can be continued; A wireless communication device as described in Supplementary Note 2, characterized in that the terminal that made the connection request is assigned to the beam table of the corresponding beam.

[0113] (Supplementary Note 4) The resource management unit a second threshold corresponding to a reception quality equal to or greater than the first threshold, During the operation, if a terminal occurs in which the downlink reception quality of the beam currently being used has deteriorated and there is no room in the other beam table for a beam with which the terminal can continue communication, determine whether there is a terminal in the beam table with a downlink reception quality that is equal to or greater than the first threshold and equal to or less than the second threshold, and reallocate the terminal to another beam table with which communication can continue; A wireless communication device as described in Appendix 2 or 3, characterized in that the terminal whose reception quality has deteriorated is assigned to a beam table that allows communication to continue.

[0114] (Supplementary Note 5) The resource management unit A wireless communication device as described in Appendix 3 or 4, characterized in that when there is no room in the beam table assigned to a terminal that has made a connection request or a terminal whose downlink reception quality has deteriorated, the device checks the communication status of the terminals in the beam table and preferentially reallocates terminals in the DRX (Discontinuous Reception) state to other beam tables.

[0115] (Appendix 6) The wireless communication device described in Appendix 3 or 4 is characterized in that, when the number of terminals to be reallocated is multiple, the resource management unit preferentially reallocates the terminals that can be moved to other beam tables that have a larger available capacity among the other beam tables that can be reallocated.

[0116] (Appendix 7) A wireless communication device as described in Appendix 3 or 4, characterized in that when the number of terminals to be reallocated is multiple, the resource management unit preferentially reallocates terminals that can be moved to the beam table that have not been reallocated based on the beam usage history of each terminal to be reallocated.

[0117] (Appendix 8) The wireless communication device described in Appendix 3 or 4, characterized in that, when the number of terminals to be reallocated is multiple, the resource management unit checks the reception quality of each terminal to be reallocated and reallocates preferentially the terminal with the lowest reception quality.

[0118] (Appendix 9) The verification tool is connected, 9. The wireless communication device according to claim 2, wherein information corresponding to the predetermined reception quality of the terminal is directly input from the verification tool.

[0119] (Supplementary Note 10) An analysis unit is connected to a communication interface with the base station, 9. The wireless communication device according to claim 2, wherein information corresponding to the predetermined reception quality of the terminal is input from the analysis unit via the communication interface.

[0120] (Appendix 11) The verification tool is connected, The wireless communication device according to any one of appendices 1 to 8, wherein the verification tool can change, add, or delete information about each terminal contained in the beam table.

[0121] (Supplementary Note 12) In a wireless communication system including a CU (Central Unit), a DU (Distributed Unit), a RU (Remote Unit), and a UE (User Equipment), The DU includes a beam table in which the UEs to be accommodated in each of a plurality of beams are set; a resource management unit that manages the beam table; The resource management unit During operation of the system, determine a terminal that is movable between the beam tables and another beam table that can accommodate the movable UE, respectively; A wireless communication system characterized by moving the movable UE to the other beam table and adjusting the number of UEs accommodated by each of the multiple beam tables.

[0122] (Supplementary Note 13) Further, a verification tool connected to the DU is included, Information corresponding to a predetermined reception quality of the UE is directly input from the verification tool to the DU, The wireless communication system described in Appendix 12, characterized in that the resource management unit moves the movable UE to the other beam table based on the reception quality.

[0123] (Supplementary Note 14) Furthermore, an analysis unit is connected to a fronthaul interface between the RU and the DU, information corresponding to a predetermined reception quality of the UE is input from the analysis unit to the DU via the fronthaul interface; The wireless communication system described in Appendix 12, characterized in that the resource management unit moves the movable UE to the other beam table based on the reception quality.

[0124] (Supplementary Note 15) A radio beam allocation method performed by a radio communication device that performs radio beam management in a base station that performs radio communication with a terminal using a predetermined beam, During operation of the system, a terminal that can be moved between beam tables that have the terminals accommodated in a plurality of beams set thereon and another beam table that can accommodate the movable terminal are determined, moving the movable terminal to the other beam table and adjusting the number of terminals accommodated in each of the plurality of beam tables; A radio beam allocation method characterized in that the processing is executed by a computer.

[0125] (Supplementary Note 16) A radio beam allocation program executed by a radio communication device that performs radio beam management in a base station that performs radio communication with a terminal using a predetermined beam, During operation of the system, a terminal that can be moved between beam tables that have the terminals accommodated in a plurality of beams set thereon and another beam table that can accommodate the movable terminal are determined, moving the movable terminal to the other beam table and adjusting the number of terminals accommodated in each of the plurality of beam tables; A radio beam allocation program that causes a computer to execute processing. [Explanation of symbols]

[0126] 100 Wireless Communication System 101 Wireless Communication Unit (DU) 102 Control Station (CU) 103 Base Station (RU) 104 User Equipment (UE) 111 Front Hall 115 Core Network 120 Beam Table 130 Resource Management Department 140 Verification Tools 150 Fronthaul Analysis Unit 201,211 memory 202,212 Beam Table Management Unit 203 Reference signal calculation unit 204 Reallocation Judgment Unit 205 Lower IF section 213 Reference signal acquisition unit 214 Upper IF Section 301 processor 302 memory 303 Network Interface 305 Recording Media NW Network

Claims

1. A wireless communication device that performs wireless resource management in a base station that performs wireless communication with a terminal using a predetermined beam, a memory for storing a beam table in which the terminals to be accommodated in each of a plurality of beams are set; a resource management unit that manages the beam table; The resource management unit During operation of the system, determining a terminal that is movable between the beam tables and another beam table that can accommodate the movable terminal, respectively; moving the movable terminal to the other beam table and adjusting the number of terminals accommodated in each of the plurality of beam tables; Detecting the reception quality of the downlink signal reported from each terminal at predetermined intervals; If there is a terminal whose downlink reception quality is equal to or less than the first threshold at which stable reception can be performed, a reallocation is performed to move the terminal to another beam table that satisfies the reception quality at which communication can be continued, a second threshold corresponding to a reception quality equal to or greater than the first threshold, During the operation, if a terminal requests connection via a predetermined beam and there is no room in the beam table corresponding to the beam of the terminal, determine whether there is a terminal in the beam table whose downlink reception quality is equal to or greater than the first threshold and equal to or less than the second threshold, and reallocate the terminal to another beam table with which communication can be continued; A wireless communication device characterized in that the terminal that made the connection request is assigned to the beam table of the corresponding beam.

2. The resource management unit: a second threshold corresponding to a reception quality equal to or greater than the first threshold, During the operation, if a terminal occurs in which the downlink reception quality of the beam currently being used has deteriorated and there is no room in the other beam table for a beam with which the terminal can continue communication, determine whether there is a terminal in the beam table whose downlink reception quality is equal to or greater than the first threshold and equal to or less than the second threshold, and reallocate the terminal to another beam table with which communication can continue; The wireless communication device according to claim 1, wherein the terminal whose reception quality has deteriorated is assigned to a beam table that allows communication to be continued.

3. The resource management unit: A wireless communication device as described in claim 1 or 2, characterized in that when there is no room in the beam table assigned to a terminal that has made a connection request or a terminal whose downlink reception quality has deteriorated, the communication status of the terminals present in the beam table is checked and terminals in a DRX (Discontinuous Reception) state are preferentially reallocated to other beam tables.

4. The resource management unit: A wireless communication device as described in claim 1 or 2, characterized in that when the number of terminals to be reallocated is multiple, the device prioritizes reallocating terminals that can be moved to other beam tables that have a larger available capacity among other beam tables that can be reallocated, or prioritizes reallocating terminals that can be moved to the beam table that has not been reallocated based on the beam usage history of each reallocated terminal, or checks the reception quality of each reallocated terminal and prioritizes reallocating terminals with the lowest reception quality.

5. A wireless communication system including a CU (Central Unit), a DU (Distributed Unit), an RU (Remote Unit), and a UE (User Equipment), The DU includes a beam table that sets the UEs to be accommodated in each of a plurality of beams; a resource management unit that manages the beam table; The resource management unit During operation of the system, determine a terminal that is movable between the beam tables and another beam table that can accommodate the movable UE, respectively; Moving the movable UE to the other beam table and adjusting the number of UEs accommodated by each of the plurality of beam tables; Detecting the reception quality of the downlink signal reported from each terminal at predetermined intervals; If there is a terminal whose downlink reception quality is equal to or less than the first threshold at which stable reception can be performed, a reallocation is performed to move the terminal to another beam table that satisfies the reception quality at which communication can be continued, a second threshold corresponding to a reception quality equal to or greater than the first threshold, During the operation, if a terminal requests connection via a predetermined beam and there is no room in the beam table corresponding to the beam of the terminal, determine whether there is a terminal in the beam table whose downlink reception quality is equal to or greater than the first threshold and equal to or less than the second threshold, and reallocate the terminal to another beam table with which communication can be continued; A wireless communication system characterized in that the terminal that made the connection request is assigned to a beam table of the corresponding beam.

6. Further comprising a verification tool connected to the DU, Information corresponding to a predetermined reception quality of the UE is directly input from the verification tool to the DU, The wireless communication system according to claim 5, characterized in that the resource management unit moves the mobile UE to the other beam table based on the reception quality.

7. Further, an analysis unit is connected to a fronthaul interface between the RU and the DU, Information corresponding to a predetermined reception quality of the UE is input from the analysis unit to the DU via the fronthaul interface, The wireless communication system according to claim 5, characterized in that the resource management unit moves the mobile UE to the other beam table based on the reception quality.

8. A radio beam allocation method performed by a radio communication device that performs radio beam management at a base station that performs radio communication with a terminal using a predetermined beam, comprising: During operation of the system, a terminal that can be moved between beam tables that have the terminals accommodated in a plurality of beams set thereon and another beam table that can accommodate the movable terminal are determined, moving the movable terminal to the other beam table and adjusting the number of terminals accommodated in each of the plurality of beam tables; Detecting the reception quality of the downlink signal reported from each terminal at predetermined intervals; If there is a terminal whose downlink reception quality is equal to or less than the first threshold at which stable reception can be performed, a reallocation is performed to move the terminal to another beam table that satisfies the reception quality at which communication can be continued, a second threshold corresponding to a reception quality equal to or greater than the first threshold, During the operation, if a terminal requests connection via a predetermined beam and there is no room in the beam table corresponding to the beam of the terminal, determine whether there is a terminal in the beam table whose downlink reception quality is equal to or greater than the first threshold and equal to or less than the second threshold, and reallocate the terminal to another beam table with which communication can be continued; Allocating the terminal that has made the connection request to a beam table of the corresponding beam; A radio beam allocation method characterized in that the processing is executed by a computer.

9. A wireless beam allocation program executed by a wireless communication device that performs wireless beam management at a base station that performs wireless communication with a terminal using a predetermined beam, During operation of the system, a terminal that can be moved between beam tables that have the terminals accommodated in a plurality of beams set thereon and another beam table that can accommodate the movable terminal are determined, moving the movable terminal to the other beam table and adjusting the number of terminals accommodated in each of the plurality of beam tables; Detecting the reception quality of the downlink signal reported from each terminal at predetermined intervals; If there is a terminal whose downlink reception quality is equal to or less than the first threshold at which stable reception can be performed, a reallocation is performed to move the terminal to another beam table that satisfies the reception quality at which communication can be continued, a second threshold corresponding to a reception quality equal to or greater than the first threshold, During the operation, if a terminal requests connection via a predetermined beam and there is no room in the beam table corresponding to the beam of the terminal, determine whether there is a terminal in the beam table whose downlink reception quality is equal to or greater than the first threshold and equal to or less than the second threshold, and reallocate the terminal to another beam table with which communication can be continued; Allocating the terminal that has made the connection request to a beam table of the corresponding beam; A radio beam allocation program that causes a computer to execute processing.

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