JP2015041933A - Maintenance management system of distributed antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue wireless service after a maintenance person enters a station until the system is restored, by shortening the downtime due to failure of a remote unit as much as possible, in a distributed antenna system.SOLUTION: A mobile unit performing radio wave measurement while moving autonomously to an area, where a distributed antenna system is installed, is installed. The mobile unit includes a repeater function, moves to the vicinity of a device in which failure has occurred, repeats the wireless from an adjacent device, and covers the indoor wireless area temporarily.

Description

  The present invention relates to mobile radio communication technology, and more particularly, to radio wave measurement within a coverage area of a distributed antenna system and failure detection and failure countermeasure technology.

Due to recent advances in mobile wireless communication technology, it is expected to develop into a ubiquitous network that allows free connection to a network without being restricted by the location and speed of use of the mobile. In general, this mobile radio communication establishes communication by radiating radio waves from base stations installed on steel towers and high-rise buildings, and forming a communication area within the radio wave coverage. In addition, it is not possible to cover indoor spaces and underground spaces only by radiating radio waves from steel towers and high-rise buildings.
One technique for solving this problem is a distributed antenna system. A distributed antenna system is a configuration in which multiple remote units, which are small antenna devices, are installed in indoor and underground spaces where radio waves are difficult to reach and connected to the master unit via a hub unit. It is a configuration that can be centrally managed. The distributed antenna system can connect even more remote units by cascading hub units. In a distributed antenna system, signals from a plurality of remote units are averaged and transmitted to a radio base station using a single optical fiber. For this reason, it is not necessary to prepare base stations and lines for the number of remote units, and it is excellent in scalability.
In addition, since the distributed antenna system is configured to averagely add signals from a plurality of remote units as described above and transmit the signals to the radio base station using a single optical fiber, EVDO and It is possible to connect to a radio base station of a plurality of different communication schemes such as LTE and use them simultaneously. Therefore, there is an advantage that the future enhancement from 3G to 3.9G can be smoothly performed in addition to ensuring the stability of the wireless communication quality and expanding the area of the wireless communication.

JP 2012-227663 A JP 2008-31815 A

  By using a distributed antenna system, it is possible to construct a service area that finely covers the dead zone by installing the required number of remote units in the dead zone where radio waves from radio base stations do not reach. However, it is an indoor facility, the number of users that can be connected to one remote unit is limited, and the influence at the time of failure is far less than the radio base station of an outdoor facility that covers a large area. For this reason, distributed antenna systems are often constructed as a single system without a redundant configuration. Therefore, when communication is disabled due to a device failure, failure recovery by remote control is not supported, and recovery is possible only when a maintenance person visits the installation location and replaces the failure device. At this time, an alarm is generated due to a device failure, and the service continues to be stopped until the maintenance person enters the installation site and the replacement of the failed device is completed, resulting in prolonged downtime and reduced availability. If the area where the distributed antenna system is installed is an information security area and it takes time for permission to enter the maintenance staff, the response may be further delayed. Also, if it is used in an unattended area where people do not normally enter, such as unmanned warehouses where work is performed wirelessly, other work will be stopped if communication service is interrupted due to a failure, resulting in a significant impact. To do. For this reason, shortening the time from service stoppage due to device failure to service restoration is a problem in the maintenance of the distributed antenna system.

  As a means for solving the above-mentioned problem, it is conceivable to make the system redundant. However, considering the degree of influence due to the indoor equipment as described above, the effect is low from the viewpoint of cost effectiveness. In the prior art described in Patent Document 1, it is disclosed that a faulty remote unit is determined and the faulty remote unit is reset by remote operation. Moreover, in the prior art described in Patent Document 2, when a device failure is detected, an adjacent device can continue the service by changing the directivity of the antenna. There is a drawback in that the wireless environment of an area that has been covered by the adjacent device becomes worse.

  The present invention solves the above-mentioned problem, and in a distributed antenna system, the downtime due to a failure of a remote unit is shortened as much as possible, and the wireless service is continued until the maintenance person enters the station and the system is restored. With the goal.

In order to solve the above problems, the present invention is connected to one or a plurality of base stations connected to one or a plurality of base stations, a plurality of remote units that are radio antennas, a plurality of hub units that distribute radio signals to a plurality of remote units. A distributed antenna system having a master unit for distributing radio signals to the hub unit;
It has a radio wave measurement function unit, a repeater function unit, a switch for switching operation between the radio wave measurement mode and the repeater mode, a wheel drive unit, a distance measuring sensor, a control unit, and a memory, which are stored in the memory in advance. A moving unit that can be moved by the control unit controlling the wheel drive unit based on the running data;
A home base connected to the mobile unit, supplying power to the mobile unit and performing wired and wireless communication with the mobile unit;
A distributed antenna system maintenance management system having a server connected to the distributed antenna system and the home base, and receiving information transmitted from the distributed antenna system and performing maintenance management of the distributed antenna system and the mobile unit,
The server has information on the location of the remote unit in advance and either receives the failure information of the remote unit from the hub unit or the remote unit has failed based on the measurement result measured in the radio wave measurement mode. Once determined, travel data up to the faulty remote unit is created and transmitted to the mobile unit and the mobile unit is instructed to switch to repeater mode,
The mobile unit moves to the repeater mode after moving based on the travel data received from the server, and transmits radio waves to the area covered by the faulty remote unit.

  According to the present invention, the downtime due to a remote unit failure of the distributed antenna system can be shortened as much as possible, and the wireless service can be continued until the maintenance person enters the remote unit and restores the system. It becomes.

It is a figure explaining the block diagram of the distributed antenna system in one Embodiment of this invention. It is a figure explaining the structure of the autonomous mobile radio wave measurement robot in one Embodiment of this invention. It is a block diagram explaining the structure of the server in one Embodiment of this invention. It is a sequence diagram explaining repeater mode transfer operation in one embodiment of the present invention. It is a figure which shows the structural example of the apparatus installation position table in one Embodiment of this invention. It is an area image figure which shows the electromagnetic wave condition of the area in one Embodiment of this invention. It is an area image figure which shows the electromagnetic wave condition of the area in one Embodiment of this invention. It is an area image figure which shows the electromagnetic wave condition of the area in one Embodiment of this invention. It is a sequence diagram explaining the mode transition process in one Embodiment of this invention. It is a sequence diagram explaining the mode transition process in one Embodiment of this invention. It is a sequence diagram explaining repeater mode transition operation (when there is no sub base) in one embodiment of the present invention. It is a figure explaining the repeater operation position determination algorithm in case there is no subbase in one embodiment of the present invention. It is a sequence diagram explaining the power management process and mode transfer process in one Embodiment of this invention. It is a sequence diagram explaining the health check function using the WiFi communication function in one Embodiment of this invention.

Embodiments of the present invention will be described below.

FIG. 1 is a diagram illustrating the configuration of an embodiment of the present invention.
As shown in FIG. 1, in this embodiment, in order to compensate for the dead zone of indoor wireless environments such as buildings, in addition to the distributed antenna system that extends a plurality of small wireless antennas to improve the wireless area, In order to investigate, a radio wave measurement system that measures radio waves using the autonomous mobile radio wave measurement robot 100, and a server 107 and a maintenance terminal 108 for maintaining and monitoring them are used.

  The distributed antenna system is wireless to a plurality of remote units (RU: Remote Unit) 104 that are wireless antenna units, a hub unit (HU: Hub Unit) 103 that distributes radio signals to a plurality of RUs 104, and a plurality of HUs 103. A master unit (MU) 102 that distributes a radio signal of a base station apparatus (BTS: Base Transceiver Station) 106 is connected to each other by an optical fiber. As described above, the distributed antenna system can be connected to a plurality of radio base stations of different communication schemes and can use different communication schemes simultaneously. In the figure, only one BTS 106 is shown, You may connect with BTS of a different communication system.

The radio wave measurement system is an interface between the autonomous mobile radio wave measurement robot 100 that creates a map while measuring the surroundings, and can measure radio waves while moving autonomously based on the map, and the server 107 and the robot 100. It comprises a home base 101 and a sub-base 105 having a power feeding function.
The autonomous mobile radio wave measurement robot 100 moves to the home base 101 and starts charging the battery when the battery remaining amount of the autonomous mobile radio measurement robot 100 decreases.
The home base 101 has a battery charging function and a function of receiving radio wave measurement data measured by the autonomous mobile radio wave measurement robot 100 during charging and transferring it to the server 107 via a network. In addition, the autonomous mobile radio wave measurement robot 100 and the home base 101 have a wireless communication function, and can transmit and receive information to each other by wireless communication even while the autonomous mobile radio wave measurement robot 100 is moving. It also has a function to

  The server 107 has a function for accumulating daily radio wave measurement data and distance measurement data received from the autonomous mobile radio wave measurement robot 100, a function for determining that countermeasures in a repeater mode, which will be described later, are necessary, and a function from the MU, HU, and RU. It has a function to record alarm information. Information stored in the server, server determination contents, and the like can be viewed by the maintenance person from the maintenance terminal 108.

Next, an embodiment of the configuration of the autonomous mobile radio wave measurement robot will be described with reference to FIG.
The autonomous mobile radio wave measurement robot 100 stores a memory 200 for storing various data, a radio wave measurement antenna IF 204 having a function of receiving a pilot signal from the RU 104, a preset threshold value of the radio wave intensity of the pilot signal, A radio wave measuring unit 202 having a function of measuring the radio wave intensity of the pilot signal at regular intervals, a repeater IF 205 that is in a repeater mode near the RU that has failed according to an instruction from the server 107, a repeater unit 203 that controls the repeater IF 205, A mode changeover switch (SW) 206 for switching between the radio wave measurement mode and the repeater mode, a mode changeover switch (SW) 206, a mode changeover button 207 capable of forcibly changing SW from the outside, and a faulty RU Wi-Fi to check health with WiFi communication i interface (IF) 208, home base wireless IF 209 and home base wired IF 210 for wirelessly and wiredly communicating with the home base 101, a switch 211 for switching between these IFs, and a power supply unit for the home base 101 and the sub base 105 An infrared sensor 226 for detecting the power supply, a power supply IF 227 for supplying power and charging the battery, a distance measuring sensor 228 for measuring the distance to the indoor wall surface, a control unit 201 for controlling these various functions, A wheel drive unit 230 and a drive motor 229 are provided.

In the memory 200, the measurement data 212 of the measured pilot signal, the distance measurement data 217 created by the distance measurement sensor 228, the travel data 214 that is the travel route instructed from the maintenance terminal 108, and the control unit 201 are generated. Stored are the map data 215 and the current position data 216, and the mode time result 213 for recording the time during which the countermeasure is taken according to this embodiment.
The control unit 201 calculates the current position of the robot using the map data creation function 222 that creates a map based on the distance measurement data 217 measured by the distance measurement sensor 228, the map data 215, and the distance measurement data 217. A current position calculation unit 223, a motor control unit 225 that controls the number of revolutions of the motor 229, a mode switching instruction unit 219 that switches and controls a repeater mode or a radio wave measurement mode, and a mode switching instruction unit 219 are provided to the mode switching SW 206. A mode time measurement 220 that starts counting the number of countermeasure hours triggered by issuing an instruction to switch to the repeater mode, a WiFi health check unit 221 for performing a WiFi health check on a failed RU, and identifying a suspect, The direction of the planar antenna of the repeater IF 205 is determined based on the traveling data 214 and the map data 2 And an antenna direction control unit 218 that is controlled by using the power management unit 5 and a power management unit 224 that manages the remaining power of the autonomous mobile radio wave measurement robot and urges the return to the home base 101 when the remaining amount decreases. Has been. Furthermore, the autonomous mobile radio wave measuring robot 100 measures radio waves while autonomously moving on a specified travel route based on travel data 214 obtained from the maintenance terminal 108 via the home base 101.

FIG. 3 is a diagram for explaining the configuration of a server according to an embodiment of the present invention.
In FIG. 3, the server 107 includes a MU I / F 300, a home base I / F 301, a database 302, a control unit 303, and a maintenance terminal I / F 304. The database 302 is specified by the map data 305 generated by the distance measurement by the autonomous mobile radio wave measurement robot 100, the alarm history 306 that holds alarms from the MU 102, HU 103, and RU 104 constituting the distributed antenna system, and the maintenance terminal 108. Travel data 307 that is travel route information, apparatus installation position information 308 that indicates the installation position of the RU input from the maintenance terminal 108 to the map data 305 after the installation of the distributed antenna system is completed, and the autonomous mobile radio wave measurement robot 100 Holds measurement data 309 that is a result of radio wave measurement and a mode time result 310 that records the time during the repeater mode. The control unit 303 operates in a repeater mode in a place where there is no sub-base, an alarm management function 311 that monitors alarms transmitted from the MU 102, HU 103, and RU 104, a repeater mode determination unit 312 that determines mode switching from a specific alarm. A repeater mode position calculation unit 313 for calculating an optimal position, a route instruction unit 314 for instructing a route to a countermeasure position in response to an instruction or warning from the maintenance terminal 108, and creating travel data 307, And a countermeasure effect determining unit 315 that automatically calculates the effect of the first embodiment.

With reference to FIG. 4, the procedure for switching the autonomous mobile radio wave measurement robot to the repeater mode when the RU of the distributed antenna system fails will be described.
In the distributed antenna system, the upper device performs a health check on the lower device at regular intervals. When the health check response transmitted to the RU 104 does not return beyond a certain threshold, the HU 103 raises an alarm to the MU 102. The MU 102 that has received the alarm from the HU 103 further notifies the server 107 of the alarm. In conjunction with the alarm management function 311 of the server 107, the repeater discriminating unit 312 determines from the type of alarm whether countermeasures in the repeater mode are necessary (S11). When it is determined that countermeasures are required, the server 107 calls the device installation position 308 in the database 302 and determines whether there is a subbase in the area around the device where the alarm is issued or not. (S12).

FIG. 5 shows a configuration example of the apparatus installation position table.
In the apparatus installation position 308, the position coordinates of the installed RU 104 and sub-base 105 are registered. It is assumed that this table is information created at the time of initial system installation. If there is no information on the sub-base 105 at the device installation position 308, the point for autonomously entering the repeater mode is calculated (described in the second embodiment). If there is information on the sub-base 105, the sub-base 105 corresponding to the alarm source device is selected as a candidate, checked against the measurement data 309, and the sub-base 105 having good radio wave sensitivity is selected (S13). As another method for determining the presence or absence of a subbase, a threshold of the apparatus installation range is provided, and it is within the scope of this patent to determine whether or not a subbase exists within a range within the threshold from a failed apparatus. After the position coordinates are determined, the route to the coordinates is input to the travel data 307. The server 107 transfers the travel data 307 to the autonomous mobile radio wave measurement robot 100 via the home base 101. The autonomous mobile radio wave measuring robot 100 moves to the corresponding sub-base 105 according to the traveling data 307 (S14). To approach the sub-base 105, the infrared sensor 225 is used to dock accurately. When power supply is started from the sub-base 105, the mode switching SW 206 is switched from the mode switching instruction unit 219 of the control unit 201 of the autonomous mobile radio wave measurement robot 100, and the mode is changed to the repeater mode (S15).

With reference to FIGS. 6, 7 and 8, the transition of the radio wave environment in one embodiment of the present invention will be described.
6, 7, and 8 are diagrams illustrating an area image in which countermeasures according to the present embodiment are taken after occurrence of an abnormality from a normal time.
FIG. 6 is an image of a normal area, and is a result of comparing the apparatus installation position 308 with the measurement data 309. If the RU 104-1 stops due to a failure, the radio environment of the area that the RU 104-1 has covered so far as shown in FIG. FIG. 8 shows an area image of the radio wave environment after the autonomous mobile radio wave measuring robot 100 moves to the position designated from the sub-base near the malfunctioning device or the maintenance terminal by the above procedure and enters the repeater mode. The repeater IF 205 included in the autonomous mobile radio wave measurement robot 100 includes a planar antenna, and the side surface that receives a radio wave from a normal RU 104-2 is a side surface that repeats to the donor antenna unit and the service area of the failed RU 104-1. Is a planar antenna with an integrated structure that serves as a service antenna unit. Since the sub-base 105-A is provided with the power supply IF on both the RU 104-1 side and the RU 104-2 side, the sub-base 105-A has a structure in which the direction of the autonomous mobile radio wave measuring robot can be matched with the radio wave transmission / reception direction. .

With reference to FIG. 9, the sequence for mode transition from the measurement result will be described.
The autonomous mobile radio wave measuring robot 100 performs radio wave measurement every day and records the daily data. For example, when the radio wave environment is significantly deteriorated due to a layout change, an external wave, or the like, this measurement data can issue an alarm based on a difference between the measurement data and the previous day. Means for issuing an alarm from these radio wave measurements is disclosed in Japanese Patent Laid-Open No. 2012-173051. The autonomous mobile radio wave measuring robot 100 performs radio wave measurement (S21), and notifies the measurement data 212 to the server 107 via the home base 101. The server 107 compares the measurement data 309 of the previous day from the database 302 with the acquired measurement data 309, and if the radio wave environment has deteriorated, it is determined that countermeasures are required (S22). By the above means, the presence / absence of the sub-base is confirmed. If not, the operation described in the second embodiment is performed. If the operation is present, the travel data 307 up to the sub-base 105-A (S23) having good radio wave sensitivity is stored as home The autonomous mobile radio wave measuring robot 100 is instructed via the base 101. The autonomous mobile radio wave measuring robot 100 moves to the countermeasure location (S24). After confirming the power supply with the sub-base 105 according to the above means, the mode transits to the repeater mode (S15).
With these functions, the autonomous mobile radio wave measurement robot 100 functions as a repeater for the abnormal RU 104-1, and the availability of the wireless area can be maintained until the maintenance staff goes to the site. .

A method for canceling the repeater mode will be described with reference to FIG.
A maintenance person arrives at the site, performs maintenance work such as device replacement, confirms restoration of the distributed antenna system, and then presses the mode switching button 207 provided on the upper surface of the autonomous mobile radio wave measurement robot 100. When the mode switching button 207 is pressed, an instruction is sent to the mode switching SW 206 to switch from the repeater mode to the radio wave measurement mode (S31). After that, even if the operator presses the mode switching button 207 again, the repeater mode is set. The autonomous mobile radio wave measuring robot 100 returns to the home server 101 (S32), and transfers the mode time result 213 operated as the repeater mode to the server 107 via the home server 101. When the server 107 receives the mode time result 213, the countermeasure effect determination unit 315 calculates the countermeasure effect on the countermeasure result in the first embodiment, and determines the countermeasure effect (S33). The countermeasure effect is calculated based on general availability calculation, and availability = (MTBF / (MTBF + MTTR)) × 100, where MTBF is (total operation time in which the RU 104 has been operated + measurement time in which the above-described means functions as a repeater mode) / total The MTTR is calculated by ((total repair time from alarm generation to recovery of the RU 104-recovery time functioned as a repeater mode by the above means) / total number of failures). After the calculation is completed, the result is displayed when the maintenance terminal is accessed (S34). The cancellation of the repeater mode can be said to be within the scope of this patent if it is transmitted from the maintenance terminal 108 to the autonomous mobile radio wave measuring robot 100 via the wireless I / F of the home base 101.

In the present embodiment, an example in which the server 107 automatically calculates countermeasure points and shifts to the repeater mode even if the sub-base cannot be installed in the indoor area will be described with reference to FIGS.

FIG. 11 shows a sequence of repeater mode transition processing when there is no sub-base.
As described in the first embodiment, it is possible to switch to the repeater mode even when there is no position registration of the sub-base 105 at the apparatus installation position 308 after determining that the countermeasure in the repeater mode is necessary from the alarm notification or the measurement result. . The server 107 calculates a position that operates in the repeater mode from the map data 215, the apparatus installation position 308, and the measurement data 212 (S41). The operation position determination in the repeater mode will be described later with reference to FIG. After determining the position and direction of the repeater mode, travel data 214 is created (S42), and the autonomous mobile radio wave measurement robot 100 is instructed via the home base 101. The autonomous mobile radio wave measuring robot 100 moves to a countermeasure location according to the running data 214 (S24), starts distance measurement while taking into account the recorded antenna direction, and adjusts the direction on the spot (S43). . As soon as the above preparations are completed, the process proceeds to the repeater mode (S15).

FIG. 12 is a diagram for explaining a position determination algorithm for determining a position where an operation is performed in the repeater mode.
With reference to the apparatus installation position 308, the RU 104-1 in which the failure has occurred and the adjacent normal RU 104-2 are connected by a straight line using the map data 215. Next, with reference to the measurement data 212, the intersection 400-2 between the boundary line of the wireless intensity B402 and the wireless intensity C401 is determined as the repeater mode position. It is assumed that the criteria for determining the position of the boundary between which wireless strengths can be changed separately. Further defined as 0 ° in the y-axis direction, around the intersection point 400-2 calculates the angle to RU104-1 calculating the - [theta] _2. −θ ₂ is recorded in the travel data 214 together with the intersection 400-2. The map data 215 records not only the coordinates of the map, but also the distance from the obstacle at every fixed angle from the coordinates. Japanese Patent Laid-Open No. 22012-173051 discloses a means for measuring the distance at a constant interval of 360 degrees and a means for reflecting the surrounding data in the map data 215. When the autonomous mobile radio wave measuring robot 100 moves to the countermeasure location with the travel data 214, the autonomous mobile radio measurement robot 100 rotates from 0 degree to -θ ₂ at the intersection 400-2 based on the calculated travel data 214. Similarly, when it is determined to repeat from the RU 104-4, the intersection 400-4 determined by the position determination unit and the rotation angle −θ ₄ of the device itself are calculated and recorded in the travel data 214. Even if the autonomous mobile radio wave measuring robot 100 itself does not rotate, even if the repeater IF 205 rotates under the control of the antenna direction control unit 218, it is within the scope of the patent.

FIG. 13 shows a sequence of power management control and repeater mode transition processing.
In this embodiment, since there is no sub-base 105, there may be a case where the power of the autonomous mobile radio wave measurement robot 100 does not exist before the worker enters the site. However, as described above, the autonomous mobile measurement robot 100 manages the power of its own device by the power management unit 224 of the control unit 201, and when it falls below a certain threshold (S51), cancels the repeater mode (S52). Return to 101. The power threshold of the own device can be changed at the maintenance terminal 108. The home base 101 supplies the power of its own device (S53), and issues an alarm to the server 107 so as to prompt the operator to take early measures. After the completion of charging (S54), the autonomous mobile radio wave measuring robot 100 moves again to the countermeasure location (S24) and shifts to the repeater mode (S15).
With these functions, even if the sub-base 105 cannot be installed, the server 107 can automatically calculate countermeasure points, and the autonomous mobile radio wave measuring robot 100 can shift to the repeater mode after adjusting the direction of the antenna. The availability of the wireless area can be maintained until the maintenance staff goes to the site.

In the present embodiment, an example in which the accuracy of fault isolation is improved remotely by performing a WiFi health check on a faulty device will be described with reference to FIG.
In the configuration of the distributed antenna system, when a lower-level device becomes unable to communicate due to a failure, it is impossible to give any instructions to the failed device remotely, and the maintenance person actually goes to the installation location and performs maintenance work such as replacement. There is only. In this state, it is impossible to determine whether the RU 104 device is faulty or the optical fiber path failure between the HU 103 and the RU 104. When the operator goes to the site, it is assumed that there is an emergency, RU 104 must be prepared.
Therefore, in this embodiment, the RU is provided with a WiFi communication function, the autonomous mobile radio wave measurement robot 100 is provided with a WiFi health check function, moves to a position immediately below the failed RU 104-1, and performs wireless health check by WiFi communication. Carry out by performing. The process is the same as that described above until moving to the countermeasure location (S24). The mode is shifted to the WiFi health check mode, and (S61) the WiFi health check is transmitted from the RU 104-2. When the autonomous mobile radio wave measuring robot 100 receives the WiFi health check from the RU 104-2, it transmits it back to the RU 104-1. After waiting for a WiFi health check response from the RU 104-1 for a certain period (S <b> 62), the response is returned to the home base 101 regardless of the presence or absence of the response, and the health check result is transferred to the server 107. The maintenance person obtains data from the maintenance terminal 108 and browses the result of the remote health check (S63). As a result, if there is a response, it is determined that the suspicion is an optical fiber, and if there is no response, it is determined that the RU 104-1 main body has failed. The autonomous mobile radio wave measuring robot 100 that has finished transferring from the home base 101 moves again to the countermeasure location (S24), and shifts to the repeater mode (S15).

Even if the back surface of the autonomous mobile radio wave measuring robot 100 has a function of cleaning the floor, it is within the scope of this patent.

DESCRIPTION OF SYMBOLS 100 ... Autonomous radio wave measuring robot, 101 ... Home base, 102 ... MU, 103 ... HU, 104 ... RU, 105 ... Sub base, 106 ... BTS, 107 ... Server, 108 ... Maintenance terminal, 200 ... Memory, 201 ... Control unit 202 ... Radio wave measuring unit 203 ... Repeater unit 204 ... Radio wave measuring antenna IF, 205 ... Repeater IF, 206 ... Mode switching SW, 207 ... Mode switching button, 208 ... WiFi IF, 209 ... Home base wireless communication IF, 210 ... Home base wired communication IF, 211 ... SW, 212 ... Measured data, 213 ... Mode time result, 214 ... Running data, 215 ... Map data, 216 ... Current position data, 217 ... Ranging data, 218 ... Antenna direction control , 219 ... mode switching instruction unit, 220 ... mode time measurement, 221 ... Wi i health check unit, 222 ... mapping function, 223 ... current position calculation unit, 224 ... power management unit, 225 ... motor control unit, 226 ... infrared sensor, 227 ... power feeding IF, 228 ... range sensor, 229 ... motor, 230 ... Wheel drive unit, 300 ... MUI / F, 301 ... Home base I / F, 302 ... Database, 303 ... Control unit, 304 ... Maintenance terminal I / F, 305 ... Map data, 306 ... Alarm history, 307 ... Running Data, 308 ... Device installation position, 309 ... Measurement data, 310 ... Mode time result, 311 ... Alarm management function, 312 ... Repeater mode determination unit, 313 ... Repeater mode position calculation unit, 314 ... Travel route instruction unit, 315 ... Countermeasure Effect judging unit, 400 ... intersection (repeater mode position), 401 ... wireless strength A, 402 ... wireless strength B, 403 ... wireless strength C.

Claims (6)

A plurality of remote units that are radio antennas, a plurality of hub units that distribute radio signals to the plurality of remote units, and a master unit that is connected to one or a plurality of base stations and distributes radio signals to the plurality of hub units A distributed antenna system comprising:
It has a radio wave measurement function unit, a repeater function unit, a switch for switching operation between the radio wave measurement mode and the repeater mode, a wheel drive unit, a distance measuring sensor, a control unit, and a memory, which are stored in the memory in advance. A moving unit that can be moved by the control unit controlling the wheel drive unit based on the running data;
A home base connected to the mobile unit for power supply to the mobile unit and wired and wireless communication with the mobile unit;
A maintenance management system for a distributed antenna system, which is connected to the distributed antenna system and a home base, receives information transmitted from the distributed antenna system, and has a server for performing maintenance management of the distributed antenna system and a mobile unit. And
The server has information on the installation location of the remote unit in advance, and upon receiving failure information of the remote unit from the hub unit, it creates travel data up to the remote unit where the failure has occurred and transmits it to the mobile unit And instructing the mobile unit to switch to the repeater mode,
After moving based on the travel data received from the server, the mobile unit shifts to a repeater mode and transmits radio waves to the area covered by the failed remote unit. A plurality of remote units that are radio antennas, a plurality of hub units that distribute radio signals to the plurality of remote units, and a master unit that is connected to one or a plurality of base stations and distributes radio signals to the plurality of hub units A distributed antenna system comprising:
It has a radio wave measurement function unit, a repeater function unit, a switch for switching operation between the radio wave measurement mode and the repeater mode, a wheel drive unit, a distance measuring sensor, a control unit, and a memory, which are stored in the memory in advance. A moving unit that can be moved by the control unit controlling the wheel drive unit based on the running data;
A home base connected to the mobile unit for power supply to the mobile unit and wired and wireless communication with the mobile unit;
A maintenance management system for a distributed antenna system, which is connected to the distributed antenna system and a home base, receives information transmitted from the distributed antenna system, and has a server for performing maintenance management of the distributed antenna system and a mobile unit. And
The mobile unit transmits radio measurement data measured while traveling in the radio measurement mode to the server via the home base,
When the server detects a failure of the remote unit from the received radio wave measurement data, the server creates travel data up to the remote unit where the failure has occurred based on information on the location of the remote unit that it has in advance. And instructing the mobile unit to switch to repeater mode,
After moving based on the travel data received from the server, the mobile unit shifts to a repeater mode and transmits radio waves to the area covered by the failed remote unit. In addition to the home base, in the area where the distributed antenna system is installed, one or more sub-bases having a power feeding function are installed,
The server has installation information of the sub-base, and determines whether there is a sub-base in the vicinity of the failed remote unit. 3. The maintenance management system according to claim 1, wherein when there is a subbase, travel data up to the subbase is generated and transmitted to the mobile unit. 4. The remote unit has a WiFi communication function,
The mobile unit further includes a WiFi health check function unit for confirming whether the WiFi communication function of the remote unit is operating,
After moving to the vicinity of the faulty remote unit based on the travel data received from the server, perform a WiFi health check, return to the home base, send the WiFi health check result to the server via the home base, and then rerun the travel The maintenance management system according to claim 1, wherein the maintenance management system moves based on data and operates as a repeater.   The control unit of the mobile unit has a function of managing electric power for operating the mobile unit. When the electric power falls below a predetermined threshold, the mobile unit returns to the home base and supplies power. The maintenance management system according to claim 1, wherein the maintenance management system moves based on the data and operates as a repeater. The control unit of the mobile unit has a function of measuring the time of operation in the repeater mode, and after the operation in the repeater mode is completed, when returning to the home base, the time of operation in the repeater mode is transmitted to the server.
3. The maintenance management system according to claim 1, wherein the server performs availability calculation of a failure countermeasure result by the mobile unit based on a time of operation in the repeater mode received from the mobile unit.

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