JP6407741B2 - Control device, control method, and control program - Google Patents

Description

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

  In a wireless communication system, a base station device changes the coverage for each carrier frequency to be used by changing the tilt angle of the antenna device (see Patent Document 1).

JP2012-16015A

  However, changing the tilt angle is accompanied by a change in coverage. For this reason, the change of the tilt angle must be carefully performed by determining the degree of influence on the user. For this reason, there is a problem that the control device cannot smoothly change the coverage of a plurality of carrier frequencies.

  An object of this invention is to provide the control apparatus, control method, and control program which can perform smoothly the change of the coverage of several carrier frequencies.

  One aspect of the present invention is a control device that outputs control information for controlling a base station that uses a plurality of carrier frequencies for wireless communication with a terminal. The change time from the start of changing the carrier frequency coverage until the coverage of the first carrier frequency becomes the target coverage in stages, and the start of changing the carrier frequency coverage of the other base station to the carrier frequency of the other base station A change time until the coverage of the second carrier frequency becomes the target coverage in stages, or a change time until the coverage of the second carrier frequency becomes the target coverage in stages from the start of changing the coverage of the second carrier frequency A control unit comprising: a carrier wave control unit that varies the output time; and an output unit that outputs the control information about the coverage having the different change times to the base station. .

  According to one aspect of the present invention, the carrier wave control unit determines the coverage based on the change time of the first carrier frequency provided with a first coverage determination condition that is a first condition for determining coverage. It is a control apparatus which makes longer than the change time of the second carrier frequency provided with a second coverage determination condition that is a second condition to do.

  One aspect of the present invention is such that the carrier wave control unit changes the coverage of the first carrier frequency in stages while confirming that there is no adverse effect on the communication of the coverage of the first carrier frequency. It is.

  One aspect of the present invention is a control device in which the carrier wave control unit changes the change time of the first carrier frequency according to a result of confirmation that there is no adverse effect.

  One aspect of the present invention is a control device in which the control information is information for controlling a tilt angle of an antenna of the base station.

  One aspect of the present invention is a control device in which the control information is information for controlling transmission power of the base station.

  One aspect of the present invention is a control device in which the carrier wave control unit determines coverage of the second carrier frequency for a plurality of the base stations.

  One aspect of the present invention is a control device in which the carrier wave control unit is provided separately from the base station.

  One aspect of the present invention is a control device in which the carrier wave control unit is distributed and provided in a plurality of the base stations.

  One aspect of the present invention is a control device in which the carrier wave control unit makes the change time when the coverage is expanded longer than the change time when the coverage is reduced.

  One aspect of the present invention is a control method in a control apparatus that outputs control information for controlling a base station that uses a plurality of carrier frequencies for wireless communication with a terminal, and the control method includes: , The change time from the start of changing the coverage of the first carrier frequency until the coverage of the first carrier frequency reaches the target coverage in stages, and the start of changing the coverage of the carrier frequency of other base stations to the other base Change time until the coverage of the carrier frequency of the station becomes the target coverage in stages, or from the start of changing the coverage of the second carrier frequency until the coverage of the second carrier frequency becomes the target coverage in stages And a step of outputting to the base station the control information on the coverage having a different change time. Is that control method.

  According to one aspect of the present invention, a computer in a control device that outputs control information targeted for control of a base station that uses a plurality of carrier frequencies for wireless communication with a terminal includes: The change time from the start of changing the coverage of the carrier frequency of the first carrier frequency until the coverage of the first carrier frequency becomes the target coverage in stages, and the carrier of the other base station from the start of changing the coverage of the carrier frequency of the other base station Change time until the frequency coverage becomes the target coverage in stages, or change time from the start of changing the coverage of the second carrier frequency until the coverage of the second carrier frequency becomes the target coverage in stages And a procedure for outputting the control information for the coverage with different change times to the base station. Which is a control program.

  According to the present invention, the carrier control unit includes a change time from the start of changing the coverage of the first carrier frequency among the plurality of carrier frequencies until the coverage of the first carrier frequency becomes the target coverage in stages. The change time from the start of changing the coverage of the carrier frequency of another base station until the coverage of the carrier frequency of the other base station becomes the target coverage in stages, or the second from the start of changing the coverage of the second carrier frequency The change time until the coverage of the carrier frequency reaches the target coverage in stages is made different. Thereby, the radio | wireless communications system, a control apparatus, the control method, and a control program can perform the change of the coverage of several carrier frequencies smoothly.

It is a block diagram which shows the radio | wireless communications system in 1st Embodiment of this invention. It is explanatory drawing which shows the example of the coverage in 1st Embodiment of this invention. It is explanatory drawing which shows the tilt angle in 1st Embodiment of this invention. It is a figure which shows the example of the carrier wave frequency, the use of a carrier frequency, and the tilt angle of an antenna apparatus in 1st Embodiment of this invention. It is a figure which shows the example of the coverage determination conditions in 1st Embodiment of this invention. It is a figure which shows the example of the change time in 1st Embodiment of this invention. It is a figure which shows the example of the coverage in 1st Embodiment of this invention. It is a figure which shows the example of a coverage when the 1st change time passes from the change start of the coverage of the 1st carrier frequency in 1st Embodiment of this invention. It is a figure which shows the example of a coverage when 2nd change time passes from the change start of the coverage of the 3rd carrier frequency in 1st Embodiment of this invention. It is a sequence diagram which shows operation | movement of the radio | wireless communications system in 1st Embodiment of this invention. It is a block diagram which shows the radio | wireless communications system in 2nd Embodiment of this invention. It is a sequence diagram which shows operation | movement of the radio | wireless communications system in 2nd Embodiment of this invention.

[First Embodiment]
A first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing a wireless communication system 1. The wireless communication system 1 includes a control device 10, a plurality of base station devices 20, a tilt control device 30, an antenna device 31, and one or more terminal devices 40. The control device 10 performs centralized control of the base station devices 20-1 to 20-M (M is an integer equal to or greater than 2) via a wired or wireless communication line.

  Hereinafter, with respect to matters common to the base station devices 20-1 to 20-M, a part of the reference numerals are omitted and referred to as “base station device 20”. Items common to the tilt control devices 30-1 to 30-M are denoted as “tilt control device 30” while omitting some of the reference numerals. Items common to the antenna devices 31-1 to 31 -M are denoted as “antenna device 31” by omitting a part of the reference numerals.

  The base station apparatus 20 performs radio communication with the terminal apparatus 40 existing within the coverage of the own apparatus, using radio waves of a plurality of carrier frequencies. The coverage is determined for each carrier frequency according to the tilt angle of the antenna device 31. Examples of the carrier frequency include 800 MHz band, 1.5 GHz band, and 2 GHz band. Based on the centralized control by the control device 10, the base station device 20 gives an instruction to change the tilt angle of the antenna device 31 (hereinafter referred to as “tilt angle change instruction”) over a predetermined change time, It transmits to the tilt control device 30.

  The tilt control device 30 (remote tilt unit) (RET: Remote Electrical Tilt Unit) converts the tilt angle of the antenna device 31 into the carrier frequency in response to a tilt angle change instruction notified over a predetermined change time. Change every time. Here, the tilt control device 30 changes the tilt angle of the antenna device 31 step by step by gradually changing the tilt angle until the target coverage is reached stepwise from the start of the change. The tilt control device 30 may be built in the antenna device 31.

  The antenna device 31 can transmit and receive radio waves having a plurality of carrier frequencies to and from the terminal device 40. The tilt angle of the antenna device 31 is determined for each carrier frequency. That is, the tilt angle of the antenna device 31 is determined for each coverage.

  FIG. 2 is an explanatory diagram illustrating an example of coverage. The base station device 20 performs wireless communication with the terminal device 40 existing in the coverage Cov_f1 using the carrier frequency f1. Moreover, the base station apparatus 20 may perform radio | wireless communication between the terminal devices 40 which exist in coverage Cov_f2 using the carrier frequency f2. It is determined that coverage is provided in an area (area) where the state of communication connection with the terminal device 40 exists. On the other hand, it is determined that there is a region (coverage hole) where coverage is not present in a region where the state of communication connection with the terminal device 40 does not exist for a predetermined period.

  FIG. 3 is an explanatory diagram showing the tilt angle. The base station device 20, the tilt control device 30, and the antenna device 31 are provided on the roof of a building Bu, for example. The main lobe direction DirBM is a directing direction of the main lobe BM of the vertical radiation pattern of the antenna device 31. Further, the tilt angle θ_tilt of the antenna device 31 of the base station device 20 is a depression angle formed by the horizontal direction DirH and the main lobe direction DirBM with reference to the horizontal direction DirH.

  The main lobe direction DirBM moves toward the ground Gr as the tilt angle θ_tilt increases, that is, as the antenna device 31 is tilted down. Therefore, the coverage of the base station apparatus 20 decreases as the tilt angle θ_tilt increases. In other words, the main lobe direction DirBM approaches the horizontal direction DirH as the tilt angle θ_tilt decreases, that is, as the antenna device 31 is tilted up. Therefore, the coverage of the base station apparatus 20 increases as the tilt angle θ_tilt decreases.

  FIG. 4 is a diagram illustrating an example of the carrier frequency, the usage of the carrier frequency, and the tilt angle of the antenna device 31. The usage of the carrier frequency is determined by the operation policy of the base station apparatus 20. The usage “coverage” is, for example, a usage in which priority is given to the expansion of coverage over the increase in capacity (traffic load). In addition, the usage “capacity” is a usage in which an increase in capacity is given priority over an increase in coverage, for example.

  In FIG. 4, the carrier frequency “carrier frequency f1”, the usage “coverage” of the carrier frequency, the tilt angle “8 degrees”, and the adjustment angle “± 0.2 degrees” are associated with each other. The carrier frequency “carrier frequency f2”, the carrier frequency application “coverage or capacity”, the tilt angle “4 degrees”, and the adjustment angle “± 0.2 degrees” are associated with each other. The carrier frequency “carrier frequency f3”, the carrier frequency application “coverage or capacity”, the tilt angle “4 degrees”, and the adjustment angle “± 4 degrees” are associated with each other. These are only examples. For example, the carrier frequency may include a band close to the carrier frequency.

The configuration of the control device 10 will be described.
The control device 10 includes a carrier wave control unit 11 and an output unit 12. In the first embodiment, the carrier wave control unit 11 is concentrated on a control device 10 (maintenance control console) (EMS: Element Management System) different from the base station device 20. The carrier wave control unit 11 includes a coverage determination condition storage unit 51, a coverage determination unit 52, and a base station management information storage unit 53.

  The coverage determination condition storage unit 51 stores information indicating a condition for determining the coverage of the base station device 20 (hereinafter referred to as “coverage determination condition”). Hereinafter, a coverage usage condition that prioritizes coverage over capacity and determines the coverage is referred to as a “first coverage determination condition”. In addition, a capacity usage condition that prioritizes capacity over coverage and determines the coverage is referred to as a “second coverage determination condition”.

  Each carrier frequency has an emergency coverage application or capacity application in addition to a normal coverage application or capacity application. An emergency is, for example, a failure or congestion of the own base station device or another base station device. Even if it is a carrier frequency for coverage, it may be a carrier frequency for capacity if congestion occurs. In this case, another base station apparatus may supplement a coverage hole using the carrier frequency.

  FIG. 5 is a diagram illustrating an example of coverage determination conditions. In the example of the coverage determination condition shown in FIG. 5, the first carrier frequency is a carrier frequency provided with the first coverage determination condition. The second carrier frequency is a carrier frequency provided with a first coverage determination condition. The third carrier frequency is a carrier frequency provided with a second coverage determination condition. Hereinafter, a device including at least one of the wireless unit 23, the signal processing unit 24, and the antenna device 31 is referred to as a “wireless communication device”.

  When changing the coverage of the first carrier frequency, the carrier wave control unit 11 changes the coverage of the first carrier frequency in stages while confirming that there is no adverse effect on the wireless communication. Further, when changing the coverage of the first carrier frequency, the carrier wave control unit 11 follows the coverage of the first carrier frequency and changes the coverage of the second carrier frequency step by step. In addition, when changing the coverage of the first carrier frequency, the carrier wave control unit 11 checks the change in traffic load of each coverage, and gradually changes the coverage of the third carrier frequency according to the capacity of each coverage. Change to Even when the coverage of the first carrier frequency is changed, the coverage of the second carrier frequency and the coverage of the third carrier frequency may be maintained without being changed.

  When changing the coverage of the second carrier frequency, the carrier wave control unit 11 changes the coverage of the second carrier frequency in stages while confirming that there is no adverse effect on the wireless communication. Further, when changing the coverage of the second carrier frequency, the carrier wave control unit 11 follows the coverage of the second carrier frequency and changes the coverage of the first carrier frequency in stages. In addition, when changing the coverage of the second carrier frequency, the carrier wave control unit 11 confirms the change in traffic load of each coverage, and gradually changes the coverage of the third carrier frequency according to the capacity of each coverage. Change to Even when the coverage of the second carrier frequency is changed, the coverage of the first carrier frequency and the coverage of the third carrier frequency may be maintained without being changed.

  When changing the coverage of the third carrier frequency, the carrier wave control unit 11 changes the coverage of the third carrier frequency in stages while confirming that there is no adverse effect on the wireless communication. Further, when changing the coverage of the third carrier frequency, the carrier wave control unit 11 follows the coverage of the third carrier frequency and changes the coverage of the first carrier frequency in stages. Further, when changing the coverage of the third carrier frequency, the carrier wave control unit 11 follows the coverage of the third carrier frequency and changes the coverage of the second carrier frequency step by step. Even when the coverage of the third carrier frequency is changed, the coverage of the first carrier frequency and the coverage of the second carrier frequency may be maintained without being changed.

  FIG. 6 is a diagram illustrating an example of the change time. This change time is the time from the start of change to the target coverage in stages. The coverage changes according to the tilt angle of the antenna and the transmission power of the radio wave from the antenna. Therefore, this change time is the time from the start of change to the target value for the tilt angle and transmission power.

  The change time is determined for each carrier frequency. In FIG. 6, the change time of the coverage of the first carrier frequency is T1. Moreover, the change time of the coverage of the second carrier frequency is T1. Moreover, the change time of the coverage of the third carrier frequency is T2. Here, it is assumed that the change time T1 is longer than the change time T2.

  Note that both the first carrier frequency and the second carrier frequency may be changed to capacity use. In addition, the third carrier frequency may be changed to a coverage application. Each carrier frequency may have a change time for coverage use and a change time for capacity use.

  For each carrier frequency, a change time when the coverage is expanded and a change time when the coverage is reduced may be defined. For example, the change time for expanding the coverage may be set longer than the change time for reducing the coverage.

  Moreover, when expanding coverage as a countermeasure against coverage holes, the change time may be set longer than usual. Further, when the coverage is expanded as a countermeasure against the failure, the change time may be set shorter than the normal time as in the congestion countermeasure.

  The reason why the change time T1 is longer than the change time T2 is that when the coverage of the carrier frequency for coverage use is changed, the influence on the radio communication is large. This is because it is necessary to change step by step. In addition, the reason why the change time T1 is longer than the change time T2 is that immediacy is required when changing the coverage of the carrier frequency for capacity use (capacity countermeasure), so the coverage determining unit 52 does not spend time. This is because the coverage needs to be changed in stages.

  The reason why the coverage is changed stepwise is that, for example, the coverage determining unit 52 checks the influence on the traffic while changing the tilt angle little by little. The coverage determining unit 52 determines whether to return or advance the tilt angle based on the result of confirmation even when the coverage is being changed. For example, if the tilt angle is moved 2 degrees intermittently in 30 minutes via the tilt angle control device 30, the coverage determining unit 52 moves the tilt angle by 0.2 degrees to check the influence on the traffic. Repeat 10 times.

  The speed at which the antenna tilt angle of the antenna device 31 changes may be the same for all coverages. For example, the coverage determining unit 52 selects whether to decrease the antenna tilt angle without stopping the target to 5 degrees, or to decrease the antenna tilt angle while intermittently stopping the antenna tilt angle once to the target 5 degrees. By making the change time different for each coverage. It should be noted that the speed at which the antenna tilt angle of the antenna device 31 changes may be different for each coverage.

  Returning to FIG. 1, the description of the configuration example of the wireless communication system 1 will be continued. The base station management information storage unit 53 stores management information of the base station device 20. The management information of the base station device 20 is information such as a carrier frequency used by the base station device 20, coverage of the base station device 20, or an operation policy of the base station device 20, for example. The management information of the base station device 20 may be information (see FIG. 4) including the carrier frequency, the use of the carrier frequency, and the tilt angle of the antenna device 31 in association with each other.

  The coverage determination condition storage unit 51 and the base station management information storage unit 53 are, for example, non-volatile storage media (non-temporary storage media) such as ROM (Read Only Memory), flash memory, HDD (Hard Disk Drive), etc. ). The coverage determination condition storage unit 51 and the base station management information storage unit 53 may include, for example, a volatile storage medium such as a RAM (Random Access Memory) or a register. The coverage determination condition storage unit 51 and the base station management information storage unit 53 may store a program for operating the software function unit.

  The coverage determining unit 52 receives base station information (described later) from the base station apparatus 20. The coverage determining unit 52 determines the coverage of the base station apparatus 20 for each carrier frequency used by the base station apparatus 20 based on the received base station information, the management information of the base station apparatus 20, and the coverage determination condition. To do. The coverage determining unit 52 transmits information regarding the determined coverage to the output unit 12. The information on the determined coverage is, for example, information indicating a change time, a tilt angle change instruction, and an instruction to change the transmission power of a radio wave transmitted from the antenna of the antenna device 31 (hereinafter referred to as “transmission power change instruction”). including. The transmission power change instruction is, for example, an instruction to change the transmission power of the radio wave transmitted from the antenna of the antenna device 31 for each sector.

  The coverage determination unit 52 is a software function unit that functions when a processor such as a CPU (Central Processing Unit) executes a program stored in the coverage determination condition storage unit 51 or the base station management information storage unit 53, for example. . Some or all of these functional units may be hardware functional units such as LSI (Large Scale Integration) and ASIC (Application Specific Integrated Circuit).

  The output unit 12 receives information regarding the determined coverage from the coverage determination unit 52. The output unit 12 transmits coverage control information to the base station apparatus 20 based on the information related to the determined coverage. The coverage control information includes at least one of a tilt angle change instruction and a transmission power change instruction. The coverage control information may include a parameter for controlling the antenna of the antenna device 31 (hereinafter referred to as “antenna parameter”). The antenna parameters are, for example, antenna gain, beam width, horizontal radio parameter, vertical radio parameter, and the like. The antenna parameter is determined based on the coverage control information.

A configuration of the base station apparatus 20 will be described.
The base station device 20 includes an information output unit 21, a control unit 22, a radio unit 23, and a signal processing unit 24. The information output unit 21 outputs base station information to the coverage determination unit 52 of the control device 10. The base station information includes at least one of coverage quality information and traffic load information.

  The coverage quality information is information indicating the wireless communication quality of coverage for each carrier frequency of the base station device 20. For example, the coverage quality information includes common pilot channel (CPICH: Common Pilot Channel) received power (CPICH RSCP: Received Signal Code Power), common pilot channel received quality (CPICH Ec / No), downlink (base station apparatus 20). Link to terminal device 40) Reference signal received power (RSRP), downlink reference signal received quality (RSRQ), CQI (Channel Quality Indicator), Information such as a connection rate or a call loss rate.

  The traffic load information is information indicating the traffic load of the base station device 20. The traffic load information is information indicating the traffic load for each base station device 20. Further, the traffic load information may be information indicating the traffic load for each coverage. For example, the traffic load information includes the number of terminal devices 40 connected to the base station device 20 (the number of connected terminals per cell), the sector throughput of the terminal device 40 connected to the base station device 20, or the base station device 20 This is information such as the usage rate of radio resources.

  The carrier frequency to be controlled by the control unit 22 may be a plurality of carrier frequencies used by the base station apparatus 20, and is not limited to a specific carrier frequency. Hereinafter, the description will be continued assuming that the carrier frequency is, for example, the first carrier frequency, the second carrier frequency, and the third carrier frequency. The first carrier frequency is, for example, the carrier frequency f1. The second carrier frequency is, for example, the carrier frequency f2. The third carrier frequency is, for example, the carrier frequency f3.

  The control unit 22 receives coverage control information from the output unit 12 of the control device 10. The control unit 22 includes a control function unit that controls the radio unit 23, the signal processing unit 24, and the tilt control device 30 for each carrier frequency to be controlled. The control unit 22 includes a first control unit 221, a second control unit 222, and a third control unit 223 as these control function units.

  The first control unit 221 executes control related to the first carrier frequency according to the operation mode based on the coverage control information. The second control unit 222 executes control related to the second carrier frequency according to the operation mode based on the coverage control information. The third control unit 223 performs control related to the third carrier frequency according to the operation mode based on the coverage control information. Hereinafter, items common to the first control unit 221, the second control unit 222, and the third control unit 223 will be described as items related to the control unit 22.

  The control unit 22 changes the coverage of the base station device 20 step by step based on the coverage control information received from the output unit 12 of the control device 10. For example, the control unit 22 instructs the signal processing unit 24 to change the usage method of the carrier frequency based on the coverage control information. For example, when the tilt angle change instruction is included in the coverage control information, the control unit 22 transfers the tilt angle change instruction to the tilt control device 30 for each carrier frequency. For example, when the transmission power change instruction is included in the coverage control information, the control unit 22 transfers the transmission power change instruction to the radio unit 23 for each carrier frequency. For example, when the instruction to change the antenna parameter is included in the coverage control information, the control unit 22 transfers the instruction to change the antenna parameter to the radio unit 23 for each carrier frequency.

  The radio unit 23 changes the transmission power of the radio wave transmitted from the antenna of the antenna device 31 for each carrier frequency based on the transmission power change instruction. The radio unit 23 changes the antenna parameter of the antenna device 31 for each carrier frequency based on an instruction to change the antenna parameter. The radio unit 23 controls the antenna device 31 based on the usage method of the carrier frequency determined by the signal processing unit 24 and the antenna parameter.

  The signal processing unit 24 determines how to use the carrier frequency based on an instruction to change the method of using the carrier frequency. The signal processing unit 24 transmits information indicating how to use the carrier frequency to the wireless unit 23.

  Next, a description will be given of a method in which the control device 10 changes the coverage in stages at different change times for each coverage.

  FIG. 7 is a diagram illustrating an example of coverage. Coverage Cov_f1-1 is coverage by radio waves of the first carrier frequency transmitted from the antenna device 31-1-1 controlled by the base station device 20-1. Coverage Cov_f2-1 is coverage by radio waves of the second carrier frequency transmitted from the antenna device 31-2-2 controlled by the base station device 20-1. Coverage Cov_f3-1 is coverage by radio waves of the third carrier frequency transmitted from the antenna device 31-1-3 controlled by the base station device 20-1.

  Coverage Cov_f1-2 is coverage by radio waves of the first carrier frequency transmitted from the antenna device 31-2-1 controlled by the base station device 20-2. Coverage Cov_f2-2 is coverage by radio waves of the second carrier frequency transmitted from the antenna device 31-2-2 controlled by the base station device 20-2. Coverage Cov_f3-2 is coverage by the radio wave of the third carrier frequency transmitted from the antenna device 31-2-3 controlled by the base station device 20-2.

  In FIG. 7, the coverage determination unit 52 of the control device 10 receives base station information from the base station device 20-1 and the base station device 20-2, respectively. The coverage determining unit 52 acquires management information from the base station management information storage unit 53. The coverage determination unit 52 acquires information indicating the coverage determination condition from the coverage determination condition storage unit 51 of the control device 10. The coverage determination unit 52 uses the received base station information, the management information of the base station apparatuses 20-1 and 20-2, and the coverage determination conditions, and the carrier used by the base station apparatuses 20-1 and 20-2 The coverage of base station apparatuses 20-1 and 20-2 is determined for each frequency.

  The coverage determining unit 52 transmits information regarding the determined coverage to the output unit 12. In FIG. 7, the coverage determining unit 52 continues the description on the assumption that the coverage Cov_f <b> 1-1 of the base station device 20-1 is first changed as an example. The output unit 12 notifies the first control unit 221 of a tilt angle change instruction over the change time T1. The output unit 12 notifies the second control unit 222 of a tilt angle change instruction over the change time T1. The coverage determination unit 52 changes the coverage Cov_f1-1 while confirming that there is no adverse effect on the communication of the coverage Cov_f1-1. The coverage determination unit 52 changes the coverage Cov_f2-1 following the coverage Cov_f1-1.

  FIG. 8 is a diagram illustrating an example of coverage when the change time T1 has elapsed from the start of changing the coverage Cov_f1-1. The coverage Cov_f1-1 is gradually expanded from the state shown in FIG. 7 until reaching the target coverage. The coverage Cov_f2-1 is also expanded from the state shown in FIG. 7 until the coverage is close to the target. Further, the coverage Cov_f3-1 is maintained from the state illustrated in FIG. As described above, the coverage determining unit 52 has a large influence on wireless communication when changing the coverage Cov_f1-1 and Cov_f2-1 for coverage use. Therefore, while checking the influence over time, the coverage Cov_f1-1 And Cov_f2-1 are changed. The coverage determining unit 52 may determine the influence on wireless communication based on the coverage quality information.

  The coverage determining unit 52 confirms a change in traffic load in the coverages Cov_f1-1 and Cov_f2-1. The coverage determining unit 52 may adjust the traffic load between the coverage of the base station apparatus 20-1 and the coverage of the base station apparatus 20-2. The coverage determining unit 52 changes the coverage Cov_f3-1 according to the capacity of the base station device 20-1. The coverage determination unit 52 may determine the adjustment of the traffic load based on the traffic load information. The output unit 12 notifies the second control unit 222 of a tilt angle change instruction over the change time T2.

  FIG. 9 is a diagram illustrating an example of coverage when the change time T2 has elapsed from the start of changing the coverage Cov_f3-1. The coverage Cov_f3-1 is gradually expanded from the state shown in FIG. 8 until the target coverage is reached. Thus, since the immediacy is required when changing the coverage Cov_f3-1 for capacity use, the coverage determining unit 52 changes the coverage Cov_f3-1 without taking time.

  Next, the operation of the wireless communication system 1 will be described. In FIG. 10, as an example, a case where the coverage of the first carrier frequency is changed will be described.

  In the operation described with reference to FIG. 10, the first control unit 221, the second control unit 222, and the third control unit 223 are replaced with each other, and the change time is read, so that other than the second carrier frequency. The same can be said for the case where the coverage is changed step by step. That is, the notation of the first carrier frequency, the second carrier frequency, and the third carrier frequency is convenient and can be read.

FIG. 10 is a sequence diagram showing the operation of the wireless communication system 1.
The coverage determination unit 52 intermittently notifies the first control unit 221 of the tilt angle change instruction via the output unit 12 over the change time T1 (S101).
The first control unit 221 changes the tilt angle of the antenna device 31-1-1 stepwise over the change time T1 (S102).

The coverage determination unit 52 intermittently sends a tilt angle change instruction to the second control unit 222 via the output unit 12 over the change time T1 while confirming that there is no adverse effect on the communication of the coverage Cov_f1-1. (S103).
The second control unit 222 changes the tilt angle of the antenna device 31-1-2 stepwise over the change time T1 (S104).

The coverage determining unit 52 confirms a change in traffic load in the coverages Cov_f1-1 and Cov_f2-1 (S105).
The coverage determining unit 52 intermittently notifies the third control unit 223 of the tilt angle change instruction via the output unit 12 over the change time T2 (S106).
The third control unit 223 changes the tilt angle of the antenna device 31-1-3 stepwise over the change time T2 (S107).

  As described above, the control device 10 outputs control information for which the base station device 20 that uses a plurality of carrier frequencies for wireless communication with the terminal device 40 is a control target. The control device 10 includes a carrier wave control unit 11 and an output unit 12. The carrier wave control unit 11 includes, among the plurality of carrier frequencies, a change time from the start of changing the coverage of the first carrier frequency until the coverage of the first carrier frequency gradually reaches the target coverage, and the second carrier The change time is changed from the start of changing the frequency coverage until the coverage of the second carrier frequency reaches the target coverage step by step. The output unit 12 outputs control information about the coverage with different change times to the base station.

  With this configuration, the carrier wave control unit 11 changes the change time for each coverage. Thereby, the radio | wireless communications system 1, control apparatus 10, control method, and control program of 1st Embodiment can perform smoothly the change of the coverage of several carrier frequencies.

  The carrier wave control unit 11 of the first embodiment uses the first carrier frequency change time provided with the first coverage determination condition, which is the first condition for determining the coverage, to determine the coverage. It is set longer than the change time of the second carrier frequency provided with the second coverage determination condition that is the second condition.

  The carrier wave control unit 11 of the first embodiment may change the coverage of the first carrier frequency in stages while confirming that there is no adverse effect on the communication of the coverage of the first carrier frequency. The carrier wave control unit 11 of the first embodiment may change the change time of the first carrier frequency according to the result of confirmation that there is no adverse effect.

The control information may be information for controlling the tilt angle of the antenna of the base station. The control information may be information for controlling the transmission power of the base station.
The carrier wave control unit 11 of the first embodiment determines the coverage of the first to third carrier frequencies for the plurality of base station devices 20. The carrier wave control unit 11 of the first embodiment is provided separately from the base station apparatus 20.

  Thereby, the radio | wireless communications system 1, the control apparatus 10, the control method, and the control program of 1st Embodiment can improve the capability to respond to various traffics, such as a coverage and traffic load.

[Second Embodiment]
The second embodiment is different from the first embodiment in that the carrier wave control unit 11 is provided distributed to a plurality of base station devices 20a. Only the differences from the first embodiment will be described below.

  FIG. 11 is a configuration diagram showing the wireless communication system 2. The wireless communication system 2 includes a plurality of base station devices 20a, a tilt control device 30, an antenna device 31, and one or more terminal devices 40. The base station apparatus 20a includes a control unit 22a, a radio unit 23, and a signal processing unit 24.

  The control unit 22a includes a control function unit that controls the radio unit 23, the signal processing unit 24, and the tilt control device 30 for each carrier frequency to be controlled. The control unit 22a includes a first control unit 221, a second control unit 222, and a third control unit 223 as these control function units. The control unit 22a further includes a carrier wave control unit 11. The first control unit 221, the second control unit 222, and the third control unit 223 operate according to distributed control by the carrier wave control unit 11 of the control unit 22a.

  Next, the operation of the wireless communication system 2 will be described. In FIG. 12, as an example, a case where the coverage of the first carrier frequency is changed in stages will be described.

  In the operation described with reference to FIG. 12, the first control unit 221, the second control unit 222, and the third control unit 223 are replaced with each other, and the change time is read, so that other than the second carrier frequency. The same can be said for the case where the coverage is changed step by step. That is, the notation of the first carrier frequency, the second carrier frequency, and the third carrier frequency is convenient and can be read.

FIG. 12 is a sequence diagram showing the operation of the wireless communication system 2.
The first control unit 221 changes the tilt angle of the antenna device 31-1-1 stepwise over the change time T1 (S201).
The first control unit 221 intermittently notifies the second control unit 222 of a tilt angle change instruction over the change time T1 while confirming that there is no adverse effect on the communication of the coverage Cov_f1-1 (S202). ).

The second control unit 222 changes the tilt angle of the antenna device 31-1-2 stepwise over the change time T1 (S203).
The first control unit 221 confirms a change in traffic load in the coverages Cov_f1-1 and Cov_f2-1 (S204).
The first controller 221 intermittently notifies the third controller 223 of a tilt angle change instruction over the change time T2 (S205).
The third control unit 223 changes the tilt angle of the antenna device 31-1-3 in stages over the change time T2 (S206).

  As described above, the carrier wave control unit 11 of the second embodiment may be distributed and provided in the plurality of base station apparatuses 20a.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

  A program for realizing the wireless communication system 1, the wireless communication system 2, the control device 10, the base station device 20, and the base station device 20a described above is recorded on a computer-readable recording medium, and this recording is performed. The execution process may be performed by causing a computer system to read and execute a program recorded on a medium. Here, the “computer system” may include an OS and hardware such as peripheral devices.

  Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used. The “computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a CD-ROM, a hard disk built in a computer system, etc. This is a storage device.

Further, the “computer-readable recording medium” refers to a volatile memory (for example, DRAM (Dynamic) in a computer system serving as a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. Random Access Memory)) that holds a program for a certain period of time is also included.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above.
Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Wireless communication system, 2 ... Wireless communication, 10 ... Control apparatus, 11 ... Carrier wave control part, 12 ... Output part, 20-1-M ... Base station apparatus, 20a-1-M ... Base station apparatus, 21 ... Information Output unit 22 ... control unit 22a ... control unit 23 ... radio unit 24 ... signal processing unit 30 ... tilt control device 31 ... antenna device 40 ... terminal device 51 ... coverage determination condition storage unit 52 ... Coverage determination unit, 53 ... base station management information storage unit, 221 ... first control unit, 222 ... second control unit, 223 ... third control unit, Bu ... building, BM ... main lobe, Cov_f1 ... first coverage, Cov_f2 ... second coverage, Cov_f3 ... third coverage, DirBM ... main lobe direction, DirH ... horizontal direction, θ_tilt ... tilt angle, Gr ... ground

Claims (9)

A control device for a base station using a plurality of carrier frequencies to output information der Ru coverage control information for controlling the coverage for radio communication between the terminals,
Among the plurality of carrier frequencies, the change time from the start of changing the coverage of the first carrier frequency until the coverage of the first carrier frequency becomes the target coverage step by step, and the coverage of the carrier frequency of other base stations The change time until the coverage of the carrier frequency of the other base station becomes the target coverage stepwise from the start of the change of the second carrier frequency or the coverage of the second carrier frequency from the start of the change of the coverage of the second carrier frequency A carrier wave control unit that changes the change time until the target coverage is reached,
Including information representative of the change time of the first carrier frequency, the coverage control information about the coverage of the first carrier frequency, and outputs it to the base station using the first carrier frequency, the other Output the coverage control information about the coverage of the carrier frequency of the other base station to the other base station that uses the carrier frequency of the other base station, including the information indicating the change time of the carrier frequency of the base station, An output unit that outputs the coverage control information about the coverage of the second carrier frequency to the base station that uses the second carrier frequency, including information indicating the change time of the second carrier frequency ; ,
Equipped with a,
The base station using the first carrier frequency is configured to change the first carrier frequency at the change time of the first carrier frequency based on the coverage control information about the coverage of the first carrier frequency. Change coverage gradually,
The other base station that uses the carrier frequency of the other base station, the other base station at the change time of the carrier frequency of the other base station based on the coverage control information about the coverage of the carrier frequency of the other base station. Change the carrier frequency coverage of the station in stages,
The base station using the second carrier frequency is configured to change the second carrier frequency at the change time of the second carrier frequency based on the coverage control information about the coverage of the second carrier frequency. Change coverage gradually,
The carrier wave control unit uses the change time of the first carrier frequency provided with a first coverage determination condition, which is a first condition for determining coverage, as a second condition for determining coverage. Longer than the change time of the second carrier frequency provided with the second coverage determination condition,
The carrier wave control unit changes the coverage of the first carrier frequency in stages while confirming that there is no adverse effect on communication of the coverage of the first carrier frequency,
The carrier wave control unit changes the change time of the first carrier frequency according to a result of confirmation that there is no adverse effect,
Control device. The control apparatus according to claim 1, wherein the coverage control information is information for controlling a tilt angle of an antenna of the base station. The coverage control information is information for controlling transmission power of the base station control device according to claim 1 or claim 2. The said carrier wave control part is a control apparatus as described in any one of Claims 1-3 which determines the coverage of a said 2nd carrier frequency about several said base stations. The control apparatus according to any one of claims 1 to 4 , wherein the carrier wave control unit is provided separately from the base station. The control apparatus according to any one of claims 1 to 5 , wherein the carrier wave control unit is provided in a distributed manner in a plurality of the base stations. The control apparatus according to any one of claims 1 to 6 , wherein the carrier wave control unit makes the change time when the coverage is expanded longer than the change time when the coverage is reduced. A control method in a control apparatus for a base station using a plurality of carrier frequencies to output information der Ru coverage control information for controlling the coverage for radio communication between the terminals,
Among the plurality of carrier frequencies, the change time from the start of changing the coverage of the first carrier frequency until the coverage of the first carrier frequency becomes the target coverage step by step, and the coverage of the carrier frequency of other base stations The change time until the coverage of the carrier frequency of the other base station becomes the target coverage stepwise from the start of the change of the second carrier frequency or the coverage of the second carrier frequency from the start of the change of the coverage of the second carrier frequency Step to change the time to change to the target coverage,
Including information representative of the change time of the first carrier frequency, the coverage control information about the coverage of the first carrier frequency, and outputs it to the base station using the first carrier frequency, the other Output the coverage control information about the coverage of the carrier frequency of the other base station to the other base station that uses the carrier frequency of the other base station, including the information indicating the change time of the carrier frequency of the base station, Outputting the coverage control information for the coverage of the second carrier frequency to the base station using the second carrier frequency, including information representing the change time of the second carrier frequency ;
I have a,
The base station using the first carrier frequency is configured to change the first carrier frequency at the change time of the first carrier frequency based on the coverage control information about the coverage of the first carrier frequency. Change coverage gradually,
The other base station that uses the carrier frequency of the other base station, the other base station at the change time of the carrier frequency of the other base station based on the coverage control information about the coverage of the carrier frequency of the other base station. Change the carrier frequency coverage of the station in stages,
The base station using the second carrier frequency is configured to change the second carrier frequency at the change time of the second carrier frequency based on the coverage control information about the coverage of the second carrier frequency. Change coverage gradually,
The control apparatus sets the change time of the first carrier frequency provided with a first coverage determination condition, which is a first condition for determining coverage, as a second condition for determining coverage. Longer than the change time of the second carrier frequency provided with a certain second coverage determination condition,
The control device changes the coverage of the first carrier frequency in stages while confirming that there is no adverse effect on communication of the coverage of the first carrier frequency,
The control device changes the change time of the first carrier frequency according to a result of confirmation that there is no adverse effect,
Control method. The computer in the control unit which the base station outputs information der Ru coverage control information for controlling the coverage using multiple carrier frequencies for radio communication between the terminals,
Among the plurality of carrier frequencies, the change time from the start of changing the coverage of the first carrier frequency until the coverage of the first carrier frequency becomes the target coverage step by step, and the coverage of the carrier frequency of other base stations The change time until the coverage of the carrier frequency of the other base station becomes the target coverage stepwise from the start of the change of the second carrier frequency or the coverage of the second carrier frequency from the start of the change of the coverage of the second carrier frequency With different steps to change to the target coverage,
Including information representative of the change time of the first carrier frequency, the coverage control information about the coverage of the first carrier frequency, and outputs it to the base station using the first carrier frequency, the other Output the coverage control information about the coverage of the carrier frequency of the other base station to the other base station that uses the carrier frequency of the other base station, including the information indicating the change time of the carrier frequency of the base station, Outputting the coverage control information for the coverage of the second carrier frequency to the base station using the second carrier frequency, including information representing the change time of the second carrier frequency ;
Was executed,
The base station using the first carrier frequency is configured to change the first carrier frequency at the change time of the first carrier frequency based on the coverage control information about the coverage of the first carrier frequency. Change coverage gradually,
The other base station that uses the carrier frequency of the other base station, the other base station at the change time of the carrier frequency of the other base station based on the coverage control information about the coverage of the carrier frequency of the other base station. Change the carrier frequency coverage of the station in stages,
The base station using the second carrier frequency is configured to change the second carrier frequency at the change time of the second carrier frequency based on the coverage control information about the coverage of the second carrier frequency. Change coverage gradually,
The control apparatus sets the change time of the first carrier frequency provided with a first coverage determination condition, which is a first condition for determining coverage, as a second condition for determining coverage. Longer than the change time of the second carrier frequency provided with a certain second coverage determination condition,
The control device changes the coverage of the first carrier frequency in stages while confirming that there is no adverse effect on communication of the coverage of the first carrier frequency,
The control device changes the change time of the first carrier frequency according to a result of confirmation that there is no adverse effect,
Control program.

Images