JP6121935B2 - Base station control apparatus and program - Google Patents

Description

  The present invention relates to a base station control device and a program.

Conventionally, small base stations such as femtocell base stations have been known (see, for example, Patent Document 1).
[Prior art documents]
[Patent Literature]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2011-176588

  Even when a small base station becomes unable to communicate due to a failure or the like, it is desirable to be able to communicate within the area covered by the small base station.

  According to the first aspect of the present invention, there is provided a base station control device that controls a plurality of base stations, wherein an abnormality detection unit that detects an abnormality of the plurality of base stations, and an abnormality of the base station that has one abnormality detection unit A base station control device is provided that includes a base station control unit that changes an output radio wave of a base station other than one base station among a plurality of base stations.

  In the base station control device, when the abnormality detection unit detects an abnormality of one base station, the base station control unit detects another abnormality adjacent to the one base station so as to cover the coverage area of the one base station. The output radio wave of the base station may be changed. In the base station control device, each of the plurality of base stations may include a plurality of antennas that transmit radio waves in different directions, and the base station control unit may include at least one of the plurality of antennas of other base stations. The output radio wave intensity may be changed. In the base station control device, the plurality of antennas may receive radio waves from different directions, and the base station control unit detects that an abnormality is detected by another base station when the abnormality detection unit detects an abnormality of one base station. Of the plurality of antennas, the radio wave output intensity of the antenna having higher reception intensity of radio waves transmitted from one base station than other antennas may be increased. In the base station control device, the abnormality detection unit is configured such that the loads of the plurality of base stations exceed a predetermined threshold, the abnormal disconnection rates of the plurality of base stations exceed a predetermined threshold, and a plurality of At least one of base station failures may be detected.

  The base station control device includes a position information acquisition unit that acquires position information of one base station in which an abnormality is detected by the abnormality detection unit, and another base station based on the position information acquired by the position information acquisition unit. The base station control unit may further include an output radio wave of another base station identified by the base station identification unit when the abnormality detection unit detects an abnormality of one base station. You can change it. In the base station controller, the plurality of base stations may be small cell base stations, and the base station controller covers whether or not the coverage area of the plurality of base stations is covered by the macro cell base station. The base station control unit may further include a determination unit. When the coverage area of one base station is covered by the macro cell base station, the base station control unit does not change the output radio wave of the other base station, and When the coverage area is not covered by the macro cell base station, the output radio waves of other base stations may be changed.

  According to the 2nd aspect of this invention, the program for functioning a computer as said base station control apparatus is provided.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

An example of the communication environment of a communication system is shown roughly. An example of the control state of the base station control apparatus when the femto fails is shown schematically. An example of a functional structure of a base station control apparatus is shown schematically. An example of a base station information table is shown roughly. An example of the flow of processing by a base station control apparatus is shown roughly.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 schematically shows an example of a communication environment of a communication system 100 according to the present embodiment. The communication system 100 includes a base station control device 40. The base station control device 40 controls a plurality of base stations connected to the communication network 30. The communication network 30 is, for example, the Internet. The base station control device 40 may control a plurality of small cell base stations connected to the communication network 30. For example, the base station control device 40 controls a plurality of femtocell base stations 10 connected to the communication network 30 as shown in FIG. In FIG. 1, femto 10-1, femto 10-2, and femto 10-3 are illustrated as an example of a plurality of femtocell base stations 10.

  The femto 10-1 includes an antenna 10-11 that transmits radio waves in different directions, an antenna 10-12, an antenna 10-13, and an antenna 10-14. A communication area 10-110 indicates a communication area covered by the antenna 10-11. A communication area 10-120 indicates a communication area covered by the antenna 10-12. A communication area 10-130 indicates a communication area covered by the antenna 10-13. A communication area 10-140 indicates a communication area covered by the antenna 10-14.

  The femto 10-2 includes an antenna 10-21 that transmits radio waves in different directions, an antenna 10-22, an antenna 10-23, and an antenna 10-24. A communication area 10-210 indicates a communication area covered by the antenna 10-21. A communication area 10-220 indicates a communication area covered by the antenna 10-22. A communication area 10-230 indicates a communication area covered by the antenna 10-23. A communication area 10-240 indicates a communication area covered by the antenna 10-24.

  The femto 10-3 includes an antenna 10-31, an antenna 10-32, an antenna 10-33, and an antenna 10-34 that transmit radio waves in different directions. A communication area 10-310 indicates a communication area covered by the antenna 10-31. A communication area 10-320 indicates a communication area covered by the antenna 10-32. A communication area 10-330 indicates a communication area covered by the antenna 10-33. A communication area 10-340 indicates a communication area covered by the antenna 10-34. In addition, the number of antennas included in the femto 10-1, the femto 10-2, and the femto 10-3 is an example, and may be different.

  The base station control device 40 according to the present embodiment detects an abnormality in the plurality of femtocell base stations 10. The abnormality of the femtocell base station 10 means that the femtocell base station 10 is in an inoperable state, the load of the femtocell base station 10 exceeds a predetermined threshold, and abnormal disconnection of the femtocell base station 10 For example, the rate exceeds a predetermined threshold.

  When the base station control device 40 detects an abnormality in one femtocell base station 10 among the plurality of femtocell base stations 10, the one femtocell base station 10 among the plurality of femtocell base stations 10 is detected. The output radio wave of the femtocell base station 10 other than the station 10 is changed. For example, when the base station control device 40 detects an abnormality in one femtocell base station 10 among the plurality of femtocell base stations 10, the base station control device 40 is configured to cover the coverage area of the one femtocell base station 10. The output radio wave of another femtocell base station 10 adjacent to the one femtocell base station 10 is changed. The other femtocell base station 10 adjacent to one femtocell base station 10 is, for example, a femtocell base station 10 located within a predetermined range centered on the position of the one femtocell base station 10. is there.

  FIG. 2 schematically shows an example of the control state of the base station controller 40 when the femto 10-2 fails. When the base station control device 40 detects the abnormality of the femto 10-2, the base station control device 40 changes the output radio waves of the femto 10-1 and the femto 10-3 adjacent to the femto 10-2.

  As shown in FIG. 2, the base station control device 40 is an antenna that has a higher reception intensity of radio waves transmitted from the femto 10-2 that has detected an abnormality than the other antennas among the plurality of antennas of the femto 10-1. You may increase the radio wave output intensity by a certain antenna 10-12. In addition, as shown in FIG. 2, the base station control device 40 is an antenna that has a higher reception strength of radio waves transmitted from the femto 10-2 than the other antennas among the plurality of antennas of the femto 10-3. The radio wave output intensity by 10-34 may be increased. Thereby, at least a part of the cover area of the femto 10-2 in which an abnormality has occurred can be covered by the femto 10-1 and the antenna 10-3.

  FIG. 3 schematically shows an example of the functional configuration of the base station control device 40. The base station control device 40 includes a base station information storage unit 402, an abnormality detection unit 404, a position information acquisition unit 406, a base station identification unit 408, and a base station control unit 410.

  Base station information storage section 402 stores base station information 450 of a plurality of femtocell base stations 10. The base station information 450 includes, for example, femto identification information that is unique information of the femtocell base station 10, abnormal information indicating an abnormal state of the femtocell base station 10, latitude / longitude information of the femtocell base station 10, and femtocell information. The number-of-services information indicating the number of mobile stations located in the cell base station 10, the radio wave output information indicating the radio wave output status of each of the plurality of antennas included in the femtocell base station 10, and the femtocell base station 10 It includes radio wave reception information for each of the plurality of antennas provided, a macro cover status indicating whether or not it is covered by the macro cell base station, and power supply information indicating the power state of the femtocell base station 10. The radio wave reception information includes femto identification information of the femtocell base station 10 that transmits radio waves received by each of the plurality of antennas. When a plurality of antennas receive radio waves from the same femtocell base station 10, the identification information of the femtocell base station 10 may be associated with the antenna having the highest received radio wave intensity.

  The abnormality detection unit 404 detects an abnormality in the plurality of femtocell base stations 10. The abnormality detection unit 404 detects an abnormality of the femtocell base station 10 that has transmitted the abnormality signal, for example, by receiving an abnormality signal from the plurality of femtocell base stations 10. The abnormal signal includes femto identification information that is unique information of the femtocell base station 10. In addition, the abnormality detection unit 404 detects an abnormality in the plurality of femtocell base stations 10 by periodically transmitting a packet for confirming data reachability to the plurality of femtocell base stations 10. Also good. When the base station information storage unit 402 detects an abnormality in the femtocell base station 10, the base station information storage unit 402 associates the abnormality information indicating the detected abnormality with the femto identification information of the femtocell base station 10. May be stored.

  The location information acquisition unit 406 acquires location information of the femtocell base station 10 in which an abnormality is detected by the abnormality detection unit 404. The position information is, for example, latitude / longitude information. The location information acquisition unit 406 may acquire the latitude / longitude information stored in association with the femtocell base station 10 in which an abnormality has been detected from the base station information storage unit 402. The base station information storage unit 402 may store latitude and longitude information converted from the installation address registered by the contractor when the femtocell base station 10 is contracted. The base station information storage unit 402 may store latitude and longitude information received from the femtocell base station 10 when the femtocell base station 10 has a GPS (Global Positioning System) function.

  The base station specifying unit 408 specifies the femtocell base station 10 adjacent to the femtocell base station 10 in which the abnormality is detected, which covers the coverage area of the femtocell base station 10 in which the abnormality is detected. The base station specifying unit 408 detects the abnormality of the femto in which an abnormality is detected based on the position information acquired by the position information acquisition unit 406 and the position information of the plurality of femtocell base stations 10 stored in the base station information storage unit 402. A femtocell base station 10 adjacent to the cell base station 10 may be specified.

  For example, the base station specifying unit 408 determines a latitude / longitude range of + − (plus / minus) 0 · 0015 degrees with respect to the latitude / longitude information acquired by the position information acquisition unit 406 and includes the latitude / longitude range. The femtocell base station 10 to be identified is specified. The latitude and longitude to be +-(plus or minus) may be set arbitrarily.

  In the base station information storage unit 402, adjacent femtocell base stations 10 may be registered in advance for each of the plurality of femtocell base stations 10, and the base station specifying unit 408 refers to the registration information. By doing so, you may identify the femtocell base station 10 adjacent to the femtocell base station 10 in which abnormality was detected.

  Further, the base station specifying unit 408 refers to the base station information 450 stored in the base station information storage unit 402, and the femtocell base station in which an abnormality is detected in the radio wave reception information registered in the base station information 450 The femtocell base station 10 in which the ten femto identification information is registered may be specified as the femtocell base station 10 adjacent to the femtocell base station 10 in which the abnormality is detected.

  The base station control unit 410 changes the output radio wave of the femtocell base station 10 specified by the base station specifying unit 408. The base station control unit 410 changes the output radio wave of the femtocell base station 10 specified by the base station specifying unit 408 so as to cover the coverage area of the femtocell base station 10 in which the abnormality is detected by the abnormality detection unit 404. Good. For example, the base station control unit 410 has other reception strengths of radio waves transmitted from the femtocell base station 10 in which an abnormality is detected among the plurality of antennas included in the femtocell base station 10 specified by the base station specifying unit 408. Increasing the radio wave output intensity due to the antenna higher than the antenna. When the abnormality is resolved, the base station control unit 410 may return the output radio wave of the femtocell base station 10 specified by the base station specifying unit 408 to the state before the change.

  The base station control unit 410 determines the femtocell base station 10 specified by the base station specifying unit 408 based on whether the coverage area of the femtocell base station 10 in which an abnormality is detected is covered by the macro cell base station. The output radio wave may be controlled. For example, when the coverage area of the femtocell base station 10 in which an abnormality is detected is covered by the macrocell base station, the base station control unit 410 outputs the femtocell base station 10 specified by the base station specifying unit 408. When the radio wave is not changed and is not covered, the output radio wave of the femtocell base station 10 specified by the base station specifying unit 408 is changed.

  FIG. 4 schematically shows an example of the base station information 450. The base station information 450 includes a femto identification information column 452, an abnormality information column 454, a latitude / longitude information column 456, a number-of-zones information column 458, a radio wave output information column 460, a radio wave reception information column 462, a macro cover status column 464, and power supply information. Column 466 is included. It is not essential that the base station information 450 includes all of these items.

  The femto identification information column 452 includes femto identification information. The abnormality information column 454 includes an abnormal state indicating an abnormal state of the femtocell base station 10. Normality or abnormality may be registered in the abnormality information column 454. The latitude / longitude information column 456 includes latitude / longitude information of the femtocell base station 10. The visited area information column 458 includes the number of mobile stations located in the femtocell base station 10.

  The radio wave output information column 460 includes radio wave output status for each of the plurality of antennas included in the femtocell base station 10. In the radio wave output information column 460, the radio wave output intensity for each of the plurality of antennas included in the femtocell base station 10 may be registered. The radio wave reception information column 462 includes femto identification information of the femtocell base station 10 that transmits radio waves received by each of the plurality of antennas included in the femtocell base station 10. When a plurality of antennas receive radio waves from the same femtocell base station 10, the identification information of the femtocell base station 10 may be associated with the antenna having the highest received radio wave intensity.

  The macro cover status column 464 includes a macro cover status indicating whether or not the coverage area of the femtocell base station 10 is covered by the macro cell base station. In the macro cover status column 464, “O” or “X” may be registered. The power information column 466 includes power information indicating the power status of the femtocell base station 10. In the power information column 466, “◯” indicating power on or “x” indicating power off may be registered.

  The abnormality detection unit 404 may determine whether or not the femtocell base station 10 is abnormal based on the power supply information column 466. For example, the abnormality detection unit 404 may determine that the femtocell base station 10 is abnormal when the power information column 466 indicates power off. Note that the abnormality detection unit 404 may determine whether or not the femtocell base station 10 is abnormal according to the duration of power off. For example, the abnormality detection unit 404 determines that the femtocell base station 10 is abnormal when the power-off state exceeds a predetermined period. Thereby, for example, when the user of the femtocell base station 10 goes out, when the power of the femtocell base station 10 is turned off, it is prevented that the femtocell base station 10 is determined to be abnormal. it can. In addition, the abnormality detection unit 404 monitors the power on / off cycle, and does not determine that the femtocell base station 10 is abnormal when the power is periodically turned off, but can determine that the power is irregularly turned off. The femtocell base station 10 may be determined to be abnormal.

  FIG. 4 exemplifies the case where the output radio wave of the femtocell base station 10 identified by A001 and A003 is changed when the power supply to the femtocell base station 10 identified by femto identification information: A002 is stopped. doing. In the example shown in FIG. 4, the antenna output intensity of Antenna 2 of the femtocell base station 10 identified by A001 is changed from −50 dBm to −45 dBm. In addition, the radio wave output intensity of Antenna 4 of the femtocell base station 10 identified by A003 is changed from −50 dBm to −45 dBm.

  The base station control unit 410 may change the radio wave output intensity according to a predetermined displacement level. For example, the base station control unit 410 outputs the output radio wave of the femtocell base station 10 according to the normal radio wave output intensity registered in advance and the radio wave output intensity when covering the cover area of another femtocell base station 10. You may change the intensity. In addition, the base station control unit 410 is registered in advance according to the displacement amount of the radio wave output intensity when covering the cover area of another femtocell base station 10 with respect to the normal radio wave output intensity registered in advance. The output radio wave intensity may be changed.

  The base station control unit 410 may determine the radio wave output intensity when covering the cover area of another femtocell base station 10 by conducting an experiment in advance. For example, when the femtocell base station 10 identified by A002 is normal, the base station control unit 410 changes the radio wave output intensity of Antenna 2 of the femtocell base station 10 identified by A001 stepwise. Then, the base station control unit 410 changes the radio wave reception intensity from the femtocell base station 10 by the femtocell base station 10 identified by A002 while gradually changing the radio wave output intensity of the Antenna 2 of the femtocell base station 10. Is received from the femtocell base station 10 identified by A002. As a result, the base station control unit 410 changes the antenna output power intensity of Antenna 2 of the femtocell base station 10 identified by A001 to the position where the femtocell base station 10 identified by A002 is arranged. It can be experimentally calculated whether it can be covered.

  In addition, when the position of the femtocell base station 10 is changed, when the orientation of the femtocell base station 10 is changed, a plurality of new structures are built between the plurality of femtocell base stations 10. The radio wave situation between the femtocell base stations 10 may change. Therefore, the base station control unit 410 periodically checks the radio wave conditions of the plurality of femtocell base stations 10 to cover the information included in the radio wave reception information column 462 and the cover areas of other femtocell base stations 10. The radio wave output intensity and the like when doing so may be updated periodically.

  The base station information 450 may include items other than the items shown in FIG. For example, the base station information 450 includes height information indicating the height at which the femtocell base station 10 is installed. In this case, the base station specifying unit 408 may specify the femtocell base station 10 adjacent to one femtocell base station 10 based on the latitude / longitude information and the height information. For example, when there are a plurality of femtocell base stations 10 having the same distance in latitude and longitude from one femtocell base station 10, the base station specifying unit 408 has the height information of one femtocell base station 10. The femtocell base station 10 installed at a height closer to the height indicated by is identified as an adjacent femtocell base station 10.

  Further, the base station information 450 may include LED information indicating the state of the LED when the plurality of femtocell base stations 10 include the LED. In this case, the base station control unit 410 may control the LED of the femtocell base station 10 according to the abnormal state of the femtocell base station 10. For example, when the femtocell base station 10 is in an abnormal state, the LED may emit light so as to indicate the abnormal state. Thereby, it can be alert | reported to the circumference | surroundings of the femtocell base station 10 that the femtocell base station 10 is in an abnormal state.

  FIG. 5 schematically shows an example of the flow of processing by the base station control device 40. FIG. 5 schematically shows a processing flow when an abnormality of one femtocell base station 10 is detected. Each process illustrated in FIG. 5 is executed mainly by a control unit included in the base station control device 40.

  In step 502 (step may be abbreviated as S), the abnormality detection unit 404 detects an abnormality in one femtocell base station 10. In S504, the base station control unit 410 identifies the femtocell base station 10 in which an abnormality is detected in S502. The base station control unit 410 causes the base station information storage unit 402 to update the abnormality information corresponding to the identified femtocell base station 10.

  In S506, the base station control unit 410 determines whether it is necessary to deal with the abnormality detected in S502. The base station control unit 410 determines that the response is necessary when the coverage area of the femtocell base station 10 specified in S504 is covered by the macro cell base station, and determines that the response is necessary when the coverage area is not covered. In addition, when the operation of the femtocell base station 10 specified in S504 is stopped, the base station control unit 410 determines whether or not there is an influence of communication due to the stop, and if there is an influence, a response is required. If there is no influence, it may be determined as non-corresponding. For example, the base station control unit 410 determines that there is no influence when the number of located femtocell base stations 10 specified in S504 is zero. If it is determined that the response is necessary, the process proceeds to S508. If it is determined that the response is not required, the process ends.

  In S508, the base station specifying unit 408 specifies the femtocell base station 10 adjacent to the femtocell base station 10 specified in S504. In S510, the base station control unit 410 changes the output radio field intensity of the femtocell base station 10 specified in S508 so as to cover the coverage area of the femtocell base station 10 specified in S504. In S512, the base station control unit 410 updates the base station information 450 stored in the base station information storage unit 402 according to the content controlled in S510. Then, the process ends.

  In the above description, each unit of the base station control device 40 may be realized by hardware or may be realized by software. Further, it may be realized by a combination of hardware and software. Further, the computer may function as the base station control device 40 by executing the program. The program may be installed in a computer constituting at least a part of the base station control device 40 from a computer-readable medium or a storage device connected to a network.

  A program that is installed in a computer and causes the computer to function as the base station control device 40 according to the present embodiment causes the CPU or the like to function as each part of the base station control device 40. Information processing described in these programs functions as a specific means in which software and hardware resources of the base station control device 40 cooperate with each other by being read by a computer.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “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. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first,” “next,” etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

10 femtocell base station, 10-1 femto, 10-11 antenna, 10-110 communication area, 10-12 antenna, 10-120 communication area, 10-13 antenna, 10-130 communication area, 10-14 antenna, 10 -140 communication area, 10-2 femto, 10-21 antenna, 10-210 communication area, 10-22 antenna, 10-220 communication area, 10-23 antenna, 10-230 communication area, 10-24 antenna, 10- 240 communication area, 10-3 femto, 10-31 antenna, 10-310 communication area, 10-32 antenna, 10-320 communication area, 10-33 antenna, 10-330 communication area, 10-34 antenna, 10-340 Communication area, 30 communication networks, 40 bases Control device, 100 communication system, 402 base station information storage unit, 404 anomaly detection unit, 406 position information acquisition unit, 408 base station identification unit, 410 base station control unit, 450 base station information, 452 femto identification information column, 454 anomaly Information column, 456 Latitude / longitude information column, 458 Number of locations information column, 460 Radio wave output information column, 462 Radio wave reception information column, 464 Macro cover status column, 466 Power supply information column

Claims (7)

A base station controller for controlling a plurality of base stations,
An anomaly detector that detects anomalies of the plurality of base stations;
A base station control unit that changes an output radio wave of a base station other than the one base station among the plurality of base stations when the abnormality detection unit detects an abnormality of the one base station; and
The base station control unit, when the abnormality detection unit detects an abnormality of the one base station, when the number of visited areas indicating the number of mobile stations located in the one base station is not zero, When the output radio wave of the other base station is changed and the number of located areas is zero, the output radio wave of the other base station is not changed, and when the one base station is normal, the other base station While changing the radio wave output intensity of the base station step by step, receiving the radio wave reception intensity from the other base station by the one base station from the one base station, and based on the received radio wave reception intensity A base station controller that calculates the output radio wave intensity of the other base station when an abnormality of the one base station is detected . A base station controller for controlling a plurality of base stations,
An anomaly detector that detects anomalies of the plurality of base stations;
A base station control unit that changes an output radio wave of a base station other than the one base station among the plurality of base stations when the abnormality detection unit detects an abnormality of the one base station; and
When the one base station is normal, the base station control unit changes the radio wave output intensity of the other base station step by step, and the radio wave from the other base station by the one base station. Base station control that receives reception intensity from the one base station and calculates output radio field intensity of the other base station when an abnormality of the one base station is detected based on the received radio wave reception intensity apparatus. The base station control unit, when the abnormality detection unit detects an abnormality of the one base station, to cover a coverage area of the one base station, the other base adjacent to the one base station. The base station control apparatus according to claim 1 or 2 , wherein an output radio wave of the station is changed. Each of the plurality of base stations has a plurality of antennas that transmit radio waves in different directions,
The base station control device according to any one of claims 1 to 3 , wherein the base station control unit changes at least one output radio wave intensity of a plurality of antennas included in the other base station. The plurality of antennas receive radio waves from the different directions,
The base station control unit receives radio waves transmitted from the one base station among a plurality of antennas of the other base station when the abnormality detection unit detects an abnormality of the one base station. The base station control apparatus according to claim 4 , wherein the radio wave output intensity of an antenna having a higher intensity than other antennas is increased. A position information acquisition unit that acquires position information of the one base station in which an abnormality is detected by the abnormality detection unit;
A base station specifying unit that specifies the other base station based on the position information acquired by the position information acquiring unit, and
Said base station control unit, when the abnormality detection unit has detected an abnormality of the one base station, said base station identification unit is to change the output radio wave of the specified the other base station, claims 1 to 5, The base station control apparatus according to any one of the above. The program for functioning a computer as a base station control apparatus as described in any one of Claim 1 to 6 .

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