JP6975748B2 - Controls, programs, and control methods - Google Patents

Description

The present invention relates to a control device, a program, and a control method.

As scheduling algorithms used by radio base stations, Proportional Fair, MAX C / I (Maximum Carrier to Interference ratio), round robin and the like have been known (see, for example, Patent Document 1).
[Prior Art Document]
[Patent Document]
[Patent Document 1] Japanese Unexamined Patent Publication No. 2009-174565

It is desirable to provide a technique capable of reducing congestion in a radio base station by appropriately controlling the scheduling algorithm used by the radio base station.

According to the first aspect of the present invention, a control device is provided. Whether or not the control device meets the predetermined conditions regarding the congestion state of the radio base station that is scheduling according to the first scheduling algorithm aimed at equitably allocating radio resources to a plurality of user terminals. It may be provided with a determination unit for determining whether or not. When the determination unit determines that the condition is satisfied, the control device causes the radio base station to perform scheduling according to a second scheduling algorithm that preferentially allocates radio resources to user terminals having higher radio quality. It may be provided with a control unit for controlling the control.

The first scheduling algorithm may be an algorithm for allocating wireless resources to a user terminal whose instantaneous throughput expected when allocating wireless resources is larger than the average throughput up to that point. The first scheduling algorithm may be Proportional Fair, and the second scheduling algorithm may be MAX C / I.

The control device may include a data acquisition unit for acquiring communication status data regarding the status of wireless communication by the wireless base station, which is transmitted by the wireless base station at predetermined intervals, and the determination unit may include the determination unit. When the communication status data acquired by the data acquisition unit at each predetermined period continuously indicates that the radio base station is congested, it may be determined that the above conditions are satisfied. .. The communication status data indicates that the radio base station is congested when the number of scheduling requests per 1 TTI (Transmission Time Interval) derived based on the communication status data is larger than a predetermined threshold value. May be shown.

The determination unit may determine whether or not the radio base station scheduling according to the second scheduling algorithm has transitioned from a congested state to a non-congested state, and the control unit may determine whether or not the radio base station has transitioned from a congested state to a non-congested state. The scheduling algorithm used by the radio base station determined to have transitioned to the non-congested state may be switched from the second scheduling algorithm to the first scheduling algorithm. In the determination unit, the communication status data of the radio base station scheduled according to the second scheduling algorithm, which is acquired by the data acquisition unit at each predetermined period, is continuously transmitted to the radio. When it indicates that the base station is not congested, it may be determined that the radio base station has transitioned from the congested state to the non-congested state.

The control device has a data acquisition unit that acquires communication status data regarding the status of wireless communication by the wireless base station, and data storage that stores the communication status data, which is transmitted by the wireless base station at predetermined intervals. The determination unit may determine whether or not the above condition regarding the congestion state of the radio base station is satisfied based on the past communication status data of the radio base station. When the communication status data of the radio base station in the past second date and time corresponding to the first date and time indicates that the radio base station is congested, the determination unit determines at the first date and time. , It may be determined that the above conditions are satisfied.

Based on the communication status data stored in the data storage unit, the control device determines a specific unit that specifies a time zone indicating that the radio base station was congested on the same day of the previous week of the day. The determination unit may determine that the above-mentioned conditions regarding the congestion state of the radio base station are satisfied during the above-mentioned time zone of the above-mentioned one day, and the above-mentioned control unit may determine that the above-mentioned time of the above-mentioned one day. During the band, the radio base station may be controlled to perform scheduling according to the second scheduling algorithm. The control unit may switch the schedule algorithm used by the radio base station from the second scheduling algorithm to the first scheduling algorithm at the timing when the time zone elapses. The specific unit indicates that when the first day is a weekday and the same day of the week before the first day is a holiday, the radio base station is congested on the same day of the week before the first day. The indicated time zone may be specified.

According to the second aspect of the present invention, a program for making a computer function as the control device is provided.

According to a third aspect of the present invention, a control method performed by a computer is provided. The control method is whether or not a predetermined condition regarding the congestion state of the radio base station scheduled according to the first scheduling algorithm aimed at equitably allocating radio resources to a plurality of user terminals is satisfied. It may be provided with a determination stage for determining whether or not. The control method causes the radio base station to perform scheduling according to a second scheduling algorithm that preferentially allocates radio resources to user terminals having higher radio quality when it is determined that the conditions are satisfied in the determination stage. It may be provided with a control step to control such.

The outline of the above invention does not list all the necessary features of the present invention. A subcombination of these feature groups can also be an invention.

An example of the communication system 10 is shown schematically. An example of the processing flow by the control device 100 is schematically shown. An example of the processing flow by the control device 100 is schematically shown. An example of scheduling by the radio base station 200 is shown schematically. It is explanatory drawing for demonstrating the timing of switching of the scheduling algorithm when the control device 100 performs sudden control. It is explanatory drawing for demonstrating the control time when the control apparatus 100 performs plan control. An example of the hardware configuration of the computer 1200 that functions as the control device 100 is schematically shown.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention to which the claims are made. Also, not all combinations of features described in the embodiments are essential to the means of solving the invention.

FIG. 1 schematically shows an example of a communication system 10. The communication system 10 includes a control device 100. The communication system 10 may include a base station operation system 300. The communication system 10 may include a radio base station 200.

The control device 100 according to the present embodiment manages a plurality of radio base stations 200. The control device 100 may control the radio base station 200 so as to optimize the radio communication service provided by the radio base station 200 to the plurality of user terminals 20.

The radio base station 200 may comply with any mobile communication method. The radio base station 200 conforms to, for example, an LTE (Long Term Evolution) communication system. The radio base station 200 may comply with a 3G (3rd Generation) communication method. The radio base station 200 may comply with a 5G (5th Generation) communication system. The radio base station 200 may comply with the mobile communication system after the 6G (6th Generation) communication system. Here, a case where the radio base station 200 conforms to the LTE communication method will be mainly described as an example.

The user terminal 20 may be any terminal as long as it can communicate with the wireless base station 200. For example, the user terminal 20 is a mobile phone such as a smartphone. The user terminal 20 may be a tablet terminal, a PC (Personal Computer), or the like. The user terminal 20 may be a so-called IoT (Internet of Thing) device. The user terminal 20 may include anything corresponding to so-called IoT (Internet of Everything).

The radio base station 200 transmits statistical data 202 to the base station operation system 300 at predetermined intervals. Statistical data 202 includes various statistics within a predetermined period. The predetermined period may be described as ROP (Result Output Period). The radio base station 200 transmits the statistical data 202 for each cell to the base station operation system 300. The base station operation system 300 may be, for example, a so-called EMS (Element Management System).

The radio base station 200 transmits statistical data 202 to the base station operation system 300 every 15 minutes, for example. The statistical data 202 includes communication status data and the like indicating the status of wireless communication by the wireless base station 200. The communication status data includes a Transport Time assigned by the radio base station 200 to the plurality of user terminals 20 in 15 minutes. The Transport Time may be the total number of schedulings assigned to the plurality of user terminals 20 by the radio base station 200 in 15 minutes. The communication status data may also include the number of successful incoming / outgoing calls, the number of failed incoming / outgoing calls, the number of call disconnections, the number of successful handovers, the number of failed handovers, the amount of traffic, and the throughput.

The base station operation system 300 transmits the statistical data 202 received from the radio base station 200 to the base station statistical information DB (the database may be referred to as a DB) 400. Each of the plurality of base station operation systems 300 may transmit the statistical data 202 to the base station statistical information DB 400. Further, one base station operation system 300 that aggregates the information of the plurality of base station operation systems 300 is arranged, and the one base station operation system 300 receives statistical data 202 from the plurality of base station operation systems 300. , May be transmitted to the base station statistical information DB 400. The base station statistical information DB 400 stores the received statistical data 202.

The control device 100 has a plurality of radio bases based on the statistical data 202 stored in the base station statistical information DB 400 and the setting information of each of the plurality of radio base stations 200 stored in the base station setting information DB 500. Station 200 may be controlled.

The base station setting information DB 500 stores base station information of a plurality of radio base stations 200. The base station information includes the setting information of the radio base station 200. The setting information includes information on various setting values of the radio base station 200. Examples of set values include scheduling algorithms, frequencies, antenna angles, output intensities, and the like. The setting information may include information on the vendor of the radio base station 200. The setting information may include information of a target for which the wireless base station 200 provides a wireless communication service.

The control device 100 refers to, for example, the statistical data 202 that is periodically uploaded to the base station statistical information DB 400, and the first scheduling aimed at equitably allocating radio resources to a plurality of user terminals 20. For each of the plurality of radio base stations 200 scheduled according to the algorithm, it is determined whether or not a predetermined condition regarding the congestion state is satisfied. The first scheduling algorithm may be an algorithm for allocating a radio resource to a user terminal whose instantaneous throughput expected when allocating the radio resource is larger than the average throughput up to that point. An example of the first scheduling algorithm is Proportional Fair.

The condition may be any condition that can determine whether or not the radio base station 200 is congested. For example, the condition is a condition that is satisfied when the number of schedules per TTI is higher than a predetermined threshold value. 1 TTI in LTE is 1 ms. The number of schedules per TTI is calculated, for example, by dividing the Transport Time included in the communication status data by ROP. Further, for example, the condition is a condition that is satisfied when the PRB (Physical Resource Block) usage rate of the radio base station 200 is higher than a predetermined threshold value. Further, for example, the condition is a condition that is satisfied when the communication traffic is higher than a predetermined threshold value.

The control device 100 may determine whether or not the radio base station 200 is congested based on the device information of the radio base station 200. For example, the control device 100 determines that the radio base station 200 is congested when the CPU (Central Processing Unit) usage rate of the radio base station 200 is higher than a predetermined threshold value.

The control device 100 may acquire setting information from the base station setting information DB 500 for the radio base station 200 satisfying a predetermined condition regarding the congestion state, and determine whether or not the scheduling algorithm can be changed. .. Whether or not the scheduling algorithm can be changed may be set for each vendor of the radio base station 200. For example, the wireless base station 200 of company A can be set to be changeable, the wireless base station 200 of company B can be changed, and so on. Further, whether or not the scheduling algorithm can be changed may be set for each target to which the wireless base station 200 provides the wireless communication service. For example, the wireless base station 200 that provides the wireless communication service to the special corporate station cannot be changed, the normal wireless base station 200 can be changed, and so on. In addition, whether or not the scheduling algorithm can be changed may be arbitrarily set.

The control device 100 controls the radio base station 200 determined to be changeable so as to perform scheduling according to a second scheduling algorithm that preferentially allocates radio resources to the user terminal 20 having higher radio quality. MAX C / I can be mentioned as an example of the second scheduling algorithm.

In a mobile communication network compliant with the LTE communication method in recent years, in order to prevent the communication condition of the user terminal 20 having a low wireless quality located at the edge of the cell from being extremely deteriorated, basically, it is proportional as a scheduling algorithm. Fair is adopted. In a conventional radio base station, scheduling is performed by the Proportional File regardless of whether it is in a congested state or a non-congested state.

On the other hand, the inventor has found by repeating the experiment that the overall communication quality is improved by adopting MAX C / I as the scheduling algorithm when the radio base station 200 is congested. rice field. This means that in times of congestion, by preferentially allocating radio resources to the user terminal 20 with higher radio quality, the data that must be processed as a whole cell can be processed faster, and as a result, It is presumed that more data can be processed.

In FIG. 1, a case where one control device 100 is arranged for a plurality of base station operation systems 300 has been described mainly as an example, but the present invention is not limited to this. The control device 100 may be arranged for each of the plurality of base station operation systems 300. In this case, the control device 100 acquires the statistical data 202 received from the plurality of radio base stations 200 by the base station operation system 300 from the base station operation system 300. In this case, the control device 100 and the base station operation system 300 may be integrated. That is, the base station operation system 300 may function as the control device 100.

FIG. 2 schematically shows an example of the processing flow by the control device 100. Here, a state in which statistical data 202 is transmitted while a plurality of radio base stations 200 are scheduling using the Proportional Fair will be described as a start state. The control device 100 may execute the process shown in FIG. 2 for each ROP.

In the step (the step may be abbreviated as S) 102, the control device 100 acquires the statistical data 202 of the plurality of radio base stations 200 from the base station statistical information DB 400. In S104, the control device 100 determines whether or not there is a radio base station 200 that satisfies the congestion condition. If it is determined that it exists, the process proceeds to S106, and if it is determined that it does not exist, the process ends.

In S106, the control device 100 acquires the base station information of the radio base station 200 satisfying the congestion condition from the base station setting information DB 500. In S108, the control device 100 identifies a target base station whose scheduling algorithm can be changed from a plurality of radio base stations 200 that satisfy the congestion condition.

In S110, the control device 100 changes the setting of the scheduling algorithm of the target base station specified in S108. The control device 100 may switch the scheduling algorithm from the Proportional Fair to the MAX C / I. The control device 100 transmits, for example, a switching instruction to the base station operation system 300. The base station operation system 300 causes the radio base station 200 to switch the scheduling algorithm according to the switching instruction received from the control device 100.

When the control device 100 executes the process shown in FIG. 2, the radio base station 200 satisfying the congestion condition can be scheduled according to the MAX C / I, and the scheduling according to the Proportional Fail is continued. In comparison, the wireless base station 200 can improve the communication quality of the wireless communication service provided to the user terminal 20.

FIG. 3 schematically shows an example of the processing flow by the control device 100. The process shown in FIG. 3 is executed after the control device 100 executes the process shown in FIG. 2 after the setting of the scheduling algorithm of some of the radio base stations 200 is changed. The control device 100 may execute the process shown in FIG. 2 for each ROP.

In S202, the control device 100 acquires the statistical data 202 of the radio base station 200 whose settings have been changed from the base station statistical information DB 400. In S204, the control device 100 determines whether or not there is a radio base station 200 that satisfies the non-congestion condition. If it is determined that it exists, the process proceeds to S206, and if it is determined that it does not exist, the process ends.

In S206, the control device 100 cancels the setting of the scheduling algorithm of the radio base station 200 that satisfies the non-congestion condition. That is, the control device 100 switches the scheduling algorithm of the radio base station 200 that satisfies the non-congestion condition from MAX C / I to Proportional Fair. Then, the process is terminated.

As described above, when the scheduling algorithm is switched from the Proportional Air to the MAX C / I in a state where the radio base station 200 is congested, the communication quality of the entire cell is improved. However, the inventor has also found that when the scheduling algorithm is switched from the Proportional Fair to the MAX C / I while the radio base station 200 is not congested, the communication quality often deteriorates. When switching to MAX C / I in a non-congested state, the rate of deterioration of the communication quality of the user terminal 20 with lower wireless quality is very high compared to the rate of improvement of the communication quality of the user terminal 20 with higher wireless quality. It is thought that this is because it grows larger.

The control device 100 according to the present embodiment executes the process shown in FIG. 3 in addition to the process shown in FIG. 2, so that the radio base station 200 can be connected to the radio base station 200 only while it is highly probable that the radio base station 200 is congested. MAX C / I can be used. As a result, it is possible to improve the quality of the entire cell by MAX C / I during congestion and prevent the quality from deteriorating by using MAX C / I even during non-congestion.

FIG. 4 schematically shows an example of the functional configuration of the control device 100. The control device 100 includes a data acquisition unit 102, a data storage unit 104, a determination unit 106, a control unit 108, and a specific unit 110. It is not always essential that the control device 100 includes all of these configurations.

The data acquisition unit 102 acquires statistical data 202 from the base station statistical information DB 400. The data acquisition unit 102 may acquire the statistical data 202 from the base station statistical information DB 400 each time the base station statistical information DB 400 receives the statistical data 202 from the plurality of radio base stations 200. The data acquisition unit 102 may acquire only the communication status data included in the statistical data 202 from the base station statistical information DB 400. The data storage unit 104 stores the statistical data 202 or the communication status data acquired by the data acquisition unit 102.

The determination unit 106 determines whether or not a predetermined condition regarding the congestion state of the radio base station 200 that is scheduling according to the first scheduling algorithm is satisfied. In the determination unit 106, for example, the communication status data of the radio base station 200 scheduled according to the first scheduling algorithm acquired by the data acquisition unit 102 for each TOP is continuously congested by the radio base station 200. If it indicates that the condition is satisfied, it is determined that the condition is satisfied. The determination unit 106 determines that the condition is satisfied, for example, when the communication status data of the radio base station 200 indicates that the radio base station 200 is congested twice in succession. When the communication status data of the radio base station 200 scheduled according to the first scheduling algorithm indicates that the radio base station 200 is congested, the determination unit 106 immediately satisfies the condition. You may judge.

The communication status data indicates that the radio base station 200 is congested, for example, when the number of scheduling requests per TTI derived based on the communication status data is larger than a predetermined threshold value.

The control unit 108 controls the radio base station 200 to perform scheduling according to the second scheduling algorithm when the determination unit 106 determines that the condition is satisfied. For example, the control unit 108 transmits an instruction for scheduling according to the second scheduling algorithm to the radio base station 200 via the base station operation system 300. Further, the control unit 108 transmits, for example, a switching instruction for switching the scheduling algorithm from the first scheduling algorithm to the second scheduling algorithm to the radio base station 200 via the base station operation system 300.

The determination unit 106 may determine whether or not the radio base station 200, which is scheduling according to the second scheduling algorithm, has transitioned from the congested state to the non-congested state. In the determination unit 106, for example, the communication status data of the radio base station 200 that is scheduled according to the second scheduling algorithm, which is acquired by the data acquisition unit 102 every predetermined period, is continuously transmitted to the radio base. When it indicates that the station is not congested, it is determined that the radio base station 200 has transitioned from the congested state to the non-congested state.

The control unit 108 causes the determination unit 106 to switch the scheduling algorithm used by the radio base station 200 from the second scheduling algorithm to the first scheduling algorithm when it is determined by the determination unit 106 that the state has shifted to the non-congested state. For example, the control unit 108 transmits an instruction for scheduling according to the first scheduling algorithm to the radio base station 200 via the base station operation system 300. Further, the control unit 108 transmits, for example, a switching instruction for switching the scheduling algorithm from the second scheduling algorithm to the first scheduling algorithm to the radio base station 200 via the base station operation system 300.

As described above, the determination unit 106 and the control unit 108 indicate that the communication status data acquired by the data acquisition unit 102 every predetermined period is continuously congested in the radio base station 200. By switching the scheduling algorithm according to the fact that it is not congested or that it is not congested, the scheduling algorithm can be appropriately switched according to the change of the situation. Such control may be referred to as sudden control.

The determination unit 106 and the control unit 108 may switch the scheduling algorithm of the radio base station 200 based on the past communication status data stored in the data storage unit 104. Such control may be referred to as planned control.

The determination unit 106 determines, for example, whether or not the condition regarding the congestion state of the current radio base station 200 is satisfied based on the past communication status data of the radio base station 200. The determination unit 106 determines, for example, when the communication status data of the radio base station 200 at the past second date and time corresponding to the first date and time indicates that the radio base station 200 is congested, the first date and time. It is determined that the condition is satisfied in. The second date and time corresponding to the first date and time may be the date and time on the same day of the week as the first date and time. The second date and time corresponding to the first date and time may be the date and time of the same day of the week preceding the first date and time.

Based on the communication status data stored in the data storage unit 104, the identification unit 110 specifies a time zone indicating that the radio base station 200 was congested on the same day of the week preceding the day. The determination unit 106 may determine that the condition regarding the congestion state of the radio base station 200 is satisfied during the time zone of one day specified by the identification unit 110. The control unit 108 may control the radio base station 200 to perform scheduling according to the second scheduling algorithm during the time zone of the day specified by the specific unit 110. Further, the control unit 108 causes the scheduling algorithm used by the radio base station 200 to be switched from the second scheduling algorithm to the first scheduling algorithm at the timing when the time zone of one day specified by the specific unit 110 elapses. It's okay. If the first day is a weekday and the same day of the week before the first day is a holiday, the specific unit 110 indicates that the radio base station 200 was congested on the same day of the week before the first day. You may specify the time zone.

In sudden control, a time lag of 2 ROP occurs before it is determined that congestion is occurring, whereas in planned control, the scheduling algorithm can be switched without such a time lag. .. According to the plan control, when the communication environment changes due to the installation of a new wireless base station 200 or the change of the setting of the wireless base station 200, until the scheduling algorithm is switched according to the change. It may take some time, but according to the sudden control, it is possible to quickly respond to such a change.

FIG. 5 is an explanatory diagram for explaining the timing of switching the scheduling algorithm when the control device 100 performs sudden control. The bar graph in FIG. 5 shows the number of schedules per TTI for the downlink. The line graph in FIG. 5 shows the downlink user throughput (Mbps).

Here, it is determined that the radio base station 200 is congested when the number of schedules per TTI is 20 or more consecutively for 2 ROPs, and when the number of schedules per TTI is 20 or more consecutively for 2 ROPs, the radio is wireless. The case where it is determined that the base station 200 is not congested is illustrated. As shown in FIG. 5, the determination unit 106 and the control unit 108 change the scheduling algorithm from the first scheduling algorithm to the second scheduling algorithm at the timing when the ROP having 20 or more schedules per TTI is repeated twice. Switch.

By configuring the ROP having 20 or more schedules per TTI to be switched not only once but at two consecutive timings, it is possible to prevent frequent switching. In addition, the determination unit 106 may determine that the radio base station 200 is congested when the number of schedules per TTI is 20 or more consecutively any number of times of 3 ROP or more.

As illustrated in FIG. 5, the determination unit 106 and the control unit 108 change the scheduling algorithm from the second scheduling algorithm to the first scheduling algorithm at the timing when ROPs having less than 20 schedules per TTI are consecutive twice. You may switch. It should be noted that the determination unit 106 may determine that the radio base station 200 has transitioned from the congested state to the non-congested state when the number of schedules per TTI is less than 20 consecutively at any number of times of 3 ROP or more. Further, the determination unit 106 may determine that the radio base station 200 has immediately shifted from the congested state to the non-congested state when there is even one ROP having a schedule number less than 20 per TTI. Further, in FIG. 5, the case where the threshold value of the number of schedules per TTI is 20 has been described as an example, but the present invention is not limited to this, and the threshold value may be flexibly changed. Further, in FIG. 5, the case where the number of schedules per TTI is used as an index for determining whether or not the radio base station 200 is congested has been described as an example, but the present invention is not limited to this, and other indexes are used. You may use it.

FIG. 6 is an explanatory diagram for explaining the control time when the control device 100 performs planned control. Here, the case where the control device 100 controls the scheduling algorithm with the congestion time on the same day of the previous week as the control time for each of the plurality of days is illustrated. Although the case where Saturday and Sunday are excluded from the control target is illustrated here, the control device 100 may add Saturday and Sunday to the control target.

The control device 100 adopts, for example, the congestion time on March 4 (Monday) on the same day of the previous week as the control time on March 11 (Monday). In the example shown in FIG. 6, it is determined that the vehicle was congested from 7:45 to 8:45 on March 4 (Monday). The control unit 108 switches the scheduling algorithm from the first scheduling algorithm to the second scheduling algorithm at 7:45 on March 11 (Monday), and changes the scheduling algorithm from the second scheduling algorithm to the second scheduling algorithm at 8:45. The radio base station 200 is controlled so as to switch to the scheduling algorithm of 1.

The control device 100 adopts, for example, the congestion time on March 11 (Monday) on the same day of the previous week as the control time on March 18 (Monday). In the example shown in FIG. 6, it is determined that the vehicle was congested from 8:00 to 9:00 on March 11 (Monday). The control unit 108 switches the scheduling algorithm from the first scheduling algorithm to the second scheduling algorithm at 8 o'clock on March 18 (Monday), and switches the scheduling algorithm from the second scheduling algorithm to the first scheduling algorithm at 9 o'clock. The radio base station 200 is controlled so as to be operated.

If the same day of the previous week is a holiday, the control device 100 may adopt the congestion time of the same day of the previous week. In the example shown in FIG. 6, since the same day of the previous week is a holiday as the control time on Thursday, March 28, the control device 100 has the congestion time on Thursday, March 14, the same day of the previous week. Is adopted.

FIG. 7 schematically shows an example of a hardware configuration of a computer 1200 that functions as a control device 100. A program installed on the computer 1200 causes the computer 1200 to function as one or more "parts" of the device according to the present embodiment, or causes the computer 1200 to perform an operation associated with the device according to the present embodiment or the one or the like. A plurality of "parts" can be executed and / or a computer 1200 can be made to execute a process according to the present embodiment or a stage of the process. Such a program may be run by the CPU 1212 to cause the computer 1200 to perform certain operations associated with some or all of the blocks of the flowcharts and block diagrams described herein.

The computer 1200 according to this embodiment includes a CPU 1212, a RAM 1214, and a graphic controller 1216, which are interconnected by a host controller 1210. The computer 1200 also includes input / output units such as a communication interface 1222, a storage device 1224, a DVD drive 1226, and an IC card drive, which are connected to the host controller 1210 via the input / output controller 1220. The DVD drive 1226 may be a DVD-ROM drive, a DVD-RAM drive, or the like. The storage device 1224 may be a hard disk drive, a solid state drive, or the like. The computer 1200 also includes a legacy input / output unit such as a ROM 1230 and a keyboard, which are connected to the input / output controller 1220 via an input / output chip 1240.

The CPU 1212 operates according to a program stored in the ROM 1230 and the RAM 1214, thereby controlling each unit. The graphic controller 1216 acquires the image data generated by the CPU 1212 in a frame buffer or the like provided in the RAM 1214 or itself so that the image data is displayed on the display device 1218.

The communication interface 1222 communicates with other electronic devices via the network. The storage device 1224 stores programs and data used by the CPU 1212 in the computer 1200. The DVD drive 1226 reads the program or data from the DVD-ROM 1227 or the like and provides it to the storage device 1224. The IC card drive reads the program and data from the IC card and / or writes the program and data to the IC card.

The ROM 1230 stores in it a boot program or the like executed by the computer 1200 at the time of activation, and / or a program depending on the hardware of the computer 1200. The input / output chip 1240 may also connect various input / output units to the input / output controller 1220 via a USB port, a parallel port, a serial port, a keyboard port, a mouse port, and the like.

The program is provided by a computer-readable storage medium such as a DVD-ROM 1227 or an IC card. The program is read from a computer-readable storage medium, installed in a storage device 1224, RAM 1214, or ROM 1230, which is also an example of a computer-readable storage medium, and executed by the CPU 1212. The information processing described in these programs is read by the computer 1200 and provides a link between the program and the various types of hardware resources described above. The device or method may be configured to implement the operation or processing of information in accordance with the use of the computer 1200.

For example, when communication is executed between the computer 1200 and an external device, the CPU 1212 executes a communication program loaded in the RAM 1214, and performs communication processing with respect to the communication interface 1222 based on the processing described in the communication program. You may order. Under the control of the CPU 1212, the communication interface 1222 reads and reads transmission data stored in a transmission buffer area provided in a recording medium such as a RAM 1214, a storage device 1224, a DVD-ROM 1227, or an IC card. The data is transmitted to the network, or the received data received from the network is written to the reception buffer area or the like provided on the recording medium.

Further, the CPU 1212 makes the RAM 1214 read all or necessary parts of a file or a database stored in an external recording medium such as a storage device 1224, a DVD drive 1226 (DVD-ROM1227), an IC card, etc., on the RAM 1214. Various types of processing may be performed on the data in. The CPU 1212 may then write back the processed data to an external recording medium.

Various types of information such as various types of programs, data, tables, and databases may be stored in recording media and processed. The CPU 1212 describes various types of operations, information processing, conditional judgment, conditional branching, unconditional branching, and information retrieval described in various parts of the present disclosure with respect to the data read from the RAM 1214. Various types of processing may be performed, including / replacement, etc., and the results are written back to the RAM 1214. Further, the CPU 1212 may search for information in a file, database, or the like in the recording medium. For example, when a plurality of entries each having an attribute value of the first attribute associated with the attribute value of the second attribute are stored in the recording medium, the CPU 1212 is the first of the plurality of entries. The attribute value of the attribute of is searched for the entry that matches the specified condition, the attribute value of the second attribute stored in the entry is read, and the attribute value of the second attribute is changed to the first attribute that satisfies the predetermined condition. You may get the attribute value of the associated second attribute.

The program or software module described above may be stored on a computer 1200 or in a computer-readable storage medium near the computer 1200. Further, a recording medium such as a hard disk or RAM provided in a dedicated communication network or a server system connected to the Internet can be used as a computer-readable storage medium, whereby the program can be transferred to the computer 1200 via the network. offer.

The blocks in the flowcharts and block diagrams of this embodiment may represent the stage of the process in which the operation is performed or the "part" of the device responsible for performing the operation. Specific steps and "parts" are supplied with a dedicated circuit, a programmable circuit supplied with computer-readable instructions stored on a computer-readable storage medium, and / or with computer-readable instructions stored on a computer-readable storage medium. It may be implemented by the processor. Dedicated circuits may include digital and / or analog hardware circuits, and may include integrated circuits (ICs) and / or discrete circuits. Programmable circuits include logical products, logical sums, exclusive logical sums, negative logical products, negative logical sums, and other logical operations, such as, for example, field programmable gate arrays (FPGAs), programmable logic arrays (PLAs), and the like. , Flip-flops, registers, and reconfigurable hardware circuits, including memory elements.

The computer readable storage medium may include any tangible device capable of storing instructions executed by the appropriate device, so that the computer readable storage medium having the instructions stored therein may be in a flow chart or block diagram. It will be equipped with a product that contains instructions that can be executed to create means for performing the specified operation. Examples of the computer-readable storage medium may include an electronic storage medium, a magnetic storage medium, an optical storage medium, an electromagnetic storage medium, a semiconductor storage medium, and the like. More specific examples of computer-readable storage media include floppy (registered trademark) disks, diskettes, hard disks, random access memory (RAM), read-only memory (ROM), and erasable programmable read-only memory (EPROM or flash memory). , Electrically Erasable Programmable Read Only Memory (EEPROM), Static Random Access Memory (SRAM), Compact Disc Read Only Memory (CD-ROM), Digital Versatile Disc (DVD), Blu-ray® Disc, Memory Stick , Integrated circuit cards and the like may be included.

Computer-readable instructions are assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state-setting data, or object-oriented programming such as Smalltalk, JAVA®, C ++, etc. Includes either source code or object code written in any combination of one or more programming languages, including languages and traditional procedural programming languages such as the "C" programming language or similar programming languages. good.

Computer-readable instructions are used to generate means for a general-purpose computer, a special-purpose computer, or the processor of another programmable data processing device, or a programmable circuit, to perform an operation specified in a flowchart or block diagram. General purpose computers, special purpose computers, or other programmable data processing locally or via a local area network (LAN), a wide area network (WAN) such as the Internet, etc., to execute such computer-readable instructions. It may be provided to the processor of the device or a programmable circuit. Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers, and the like.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the description of the claims that the form with such changes or improvements may be included in the technical scope of the present invention.

The order of execution of each process such as operation, procedure, step, and step in the device, system, program, and method shown in the claims, specification, and drawings is particularly "before" and "prior to". It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Even if the scope of claims, the specification, and the operation flow in the drawings are explained using "first", "next", etc. for convenience, it means that it is essential to carry out in this order. It's not a thing.

10 communication system, 20 user terminal, 100 control device, 102 data acquisition unit, 104 data storage unit, 106 judgment unit, 108 control unit, 110 specific unit, 200 radio base station, 202 statistical data, 300 base station operation system, 400 Base station statistical information DB, 500 Base station setting information DB, 1200 computer, 1210 host controller, 1212 CPU, 1214 RAM, 1216 graphic controller, 1218 display device, 1220 input / output controller, 1222 communication interface, 1224 storage device, 1226 DVD drive , 1227 DVD-ROM, 1230 ROM, 1240 I / O chip

Claims (11)

It is determined whether or not a predetermined condition regarding the congestion state of a radio base station scheduled according to the first scheduling algorithm aimed at equitably allocating radio resources to a plurality of user terminals is satisfied. Judgment unit and
When the determination unit determines that the condition is satisfied, the radio base station is made to perform scheduling according to a second scheduling algorithm that preferentially allocates radio resources to user terminals having higher radio quality. Equipped with a control unit to control
The first scheduling algorithm is Proportional Fair.
The second scheduling algorithm, Ri MAX C / I (Maximum Carrier to Interference ratio) der,
When the control unit determines that the condition is satisfied by the determination unit, if the radio base station is a radio base station that provides a wireless communication service to a special corporate station, the scheduling algorithm may be changed. In the case of a normal radio base station other than a special corporate station, the radio base station is controlled to perform scheduling according to the second scheduling algorithm.
The determination unit determines whether or not the radio base station scheduling according to the second scheduling algorithm has transitioned from a congested state to a non-congested state.
The control unit switches the schedule algorithm used by the radio base station determined by the determination unit to be in a non-congested state from the second scheduling algorithm to the first scheduling algorithm.
Control device. It is equipped with a data acquisition unit that acquires communication status data related to the status of wireless communication by the wireless base station, which is transmitted by the wireless base station at predetermined intervals.
The determination unit satisfies the above condition when the communication status data acquired by the data acquisition unit at each predetermined period continuously indicates that the radio base station is congested. The control device according to claim 1, wherein it is determined that the control has been performed. The communication status data indicates that the radio base station is congested when the number of scheduling requests per 1 TTI (Transmission Time Interval) derived based on the communication status data is larger than a predetermined threshold value. The control device according to claim 2, as shown. In the determination unit, the communication status data of the radio base station scheduled according to the second scheduling algorithm, which is acquired by the data acquisition unit at each predetermined period, is continuously transmitted to the radio. The control device according to claim 2 or 3 , wherein when it indicates that the base station is not congested, it is determined that the radio base station has transitioned from the congested state to the non-congested state. A data acquisition unit that acquires communication status data related to the status of wireless communication by the wireless base station, which is transmitted by the wireless base station at predetermined intervals, and a data acquisition unit.
It is equipped with a data storage unit that stores the communication status data.
The control device according to claim 1, wherein the determination unit determines whether or not the condition regarding the congestion state of the radio base station is satisfied based on the past communication status data of the radio base station. When the communication status data of the radio base station in the past second date and time corresponding to the first date and time indicates that the radio base station is congested, the determination unit determines at the first date and time. The control device according to claim 5 , wherein it is determined that the above conditions are satisfied. Based on the communication status data stored in the data storage unit, a specific unit for specifying a time zone indicating that the radio base station was congested on the same day of the week before the day is provided.
The determination unit determines that the condition regarding the congestion state of the radio base station is satisfied during the time zone of the day.
The control device according to claim 5 or 6 , wherein the control unit controls the radio base station to perform scheduling according to the second scheduling algorithm during the time zone of the day. The control device according to claim 7 , wherein the control unit switches the schedule algorithm used by the radio base station from the second scheduling algorithm to the first scheduling algorithm at the timing when the time zone elapses. The specific unit indicates that when the one day is a weekday and the same day of the week before the one day is a holiday, the radio base station is congested on the same day of the week before the one day. The control device according to claim 7 or 8 , which specifies the indicated time zone. A program for operating a computer as the control device according to any one of claims 1 to 9. A control method performed by a computer
It is determined whether or not a predetermined condition regarding the congestion state of a radio base station scheduled according to the first scheduling algorithm aimed at equitably allocating radio resources to a plurality of user terminals is satisfied. The first judgment stage and
When it is determined in the first determination step that the condition is satisfied, scheduling is performed according to the second scheduling algorithm that preferentially allocates radio resources to the user terminal having higher radio quality to the radio base station. With a first control step to control what to do,
The first scheduling algorithm is Proportional Fair.
The second scheduling algorithm, Ri MAX C / I (Maximum Carrier to Interference ratio) der,
The first control step is a case where the wireless base station is a wireless base station that provides a wireless communication service to a special corporate station when it is determined in the first determination step that the conditions are satisfied. , The scheduling algorithm is not changed, and in the case of a normal wireless base station other than the special corporate station, the wireless base station is controlled to perform scheduling according to the second scheduling algorithm.
The control method is
A second determination step of determining whether or not the radio base station scheduling according to the second scheduling algorithm has transitioned from a congested state to a non-congested state.
A second control step in which the schedule algorithm used by the radio base station determined to have transitioned to the non-congested state in the second determination step is switched from the second scheduling algorithm to the first scheduling algorithm.
Further prepare,
Control method.

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