KR20090093197A - Method and system for compensate the fault of indoor RAS - Google Patents

Abstract

A method and a system for compensating the fault of an indoor RAS are provided to secure the portable internet connection by compensating the signal intensity of the indoor base station. A network management system recognizes the failure fact of occurrence of a first indoor base station(701). The communication range of the corresponding indoor base station is extended(702). The network management system sets indoor base stations except the indoor base station primary side in which failure happens as indoor RAS set that should have change in small transmission signal strength(703). The channel status value of the personal digital assistants connected to each indoor base station is grasped the network management system(704).

Description

Method and system for compensating fault of indoor base station

The present invention relates to a method and a system for correcting a fault of an indoor base station, and more particularly, to a signal strength (power) of another indoor base station in the case of a failure of a specific indoor base station among a plurality of indoor base stations installed indoors. The present invention relates to a method and system for compensating for a failure of an indoor base station to adjust portable Internet connectivity (to prevent occurrence of a coverage hole).

The present invention is derived from the research conducted as part of the core technology development project of IT new growth engine of Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management Number: 2007-S-029-01, Title: Home / Enterprise WiBro System Technology] Development].

In the present invention, the portable Internet refers to a wireless communication network capable of wireless communication at high speed while moving with Mobile WiMAX, also called WiBro (Wireless Broadband Internet).

Recently, thanks to the spread of portable Internet, it is possible to access the Internet through a mobile terminal through base stations installed around us. Here, a portable Internet access system through a base station installed indoors is commonly called an indoor wibro network system, and a portable Internet access system through a base station installed outdoors is an outdoor wibro network system. This is called. Of course, a base station installed indoors is called an indoor base station (Indoor RAS), and a base station installed outdoors is called an outdoor base station (Outdoor RAS).

Typically, OAMP (Operation, Authentication, Maintenance and Provisioning) based on Simple Network Management Protocol (SNMP) is used for communication network management.

Even in the portable Internet, a network management device (NMS), an element management device (EMS), and the like are configured on a network to manage a communication network.

In indoor portable Internet, a single indoor base station is installed indoors, whereas in a portable indoor internet such as business and public places, a large number of indoor base stations are installed indoors. ] Ensures mobile Internet connectivity is a very important issue.

In the Indic portable Internet where a plurality of Indic base stations are installed indoors as described above, a plurality of element management apparatuses are configured in one enterprise, and each element management apparatus manages a plurality of Indic base stations [network elements].

The element management apparatus collects, analyzes, and manages radio quality information of an indoor base station and checks which network problem occurs in which indoor base station through real-time monitoring. The network management data checked by the element management apparatus is transmitted to the network management apparatus, so that the network management apparatus may adjust the network settings of a specific Indic base station through interworking with the element management apparatus [transmit / receive SNMP messages].

As mentioned above, in the indoor portable Internet, a plurality of indoor base stations are installed indoors. Therefore, it can be confirmed that a specific indoor base station installed indoors often causes a failure.

For example, when a specific Indian base station fails among a plurality of indoor base stations installed indoors, portable Internet connectivity cannot be guaranteed to a portable terminal connected to the failed indoor base station. Hereinafter, the present invention will be defined as a coverage hole that does not guarantee portable Internet connectivity to the portable terminal.

In other words, since the indoor base station is inevitably installed in the prior art (non-mobility of the indoor base station), each indoor base station can be efficiently deployed (installed and deployed) to cover the inside of the enterprise efficiently, and the signal strength ( Power) is set as a fixed default value (cell planning).

However, due to fixed cell planning in the case of a failure of a specific Indian base station as described above, the mobile terminal connected to the failed Indian base station cannot receive signals from other Indian base stations, thus moving to a normal range of indoor base stations. There is a problem that the connection to the mobile Internet is disconnected. In particular, in the case of a static mobile terminal having no mobility inside the enterprise, there is a problem that the portable Internet connection cannot be made until the faulty indoor base station is normalized.

Accordingly, the present invention has been proposed to solve the above problems and to meet the above demands. In the case where a specific Indian base station fails in a plurality of indoor base stations installed indoors, the signal strength of other indoor base stations in the vicinity ( SUMMARY OF THE INVENTION An object of the present invention is to provide a method and a system for calibrating a fault of an indoor base station for adjusting (power) to ensure portable Internet connectivity (preventing a coverage hole).

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The method of the present invention for achieving the above object, in a method for correcting the failure of the indoor base station in the network management system, in recognition of the fact that the failure of a specific Indian base station, the other Indian language in the indoor language to which the A transmission signal strength changing step of changing the transmission signal strength of the base station; And a transmission signal strength recovery step of restoring the transmission signal strength of the other Indian base station that has changed the transmission signal strength in response to recognizing the failure recovery of the faulty indoor base station.

On the other hand, the system of the present invention, a system for correcting the failure of the indoor base station, at least one indoor base station whose own transmission signal strength is adjusted according to control from the network management system; And the network management system for adjusting a transmission signal strength of another indoor base station among the indoor base stations when a failure occurs in a specific indoor base station among the indoor base stations.

On the other hand, according to another method of the present invention, in the network management system for correcting the fault of the indoor base station, the location between the faulty indoor base station and the other indoor base station in accordance with the recognition of the failure of the specific Indian base station, A transmission signal strength changing step of changing a transmission signal strength of the other indoor base station based on a channel state value of a mobile terminal connected to the indoor base station; And a transmission signal strength recovery step of restoring the transmission signal strength of the other Indian base station that has changed the transmission signal strength in response to recognizing the failure recovery of the faulty indoor base station.

On the other hand, another system of the present invention, a system for correcting the failure of the indoor base station, at least one indoor base station whose own transmission signal strength is adjusted according to control from the network management system; And a transmission signal strength of the other indoor base station based on a location between the failed indoor base station and another indoor base station and a channel state value of a mobile terminal connected to the other indoor base station when a failure occurs in a specific indoor base station among the indoor base stations. It includes the network management system for adjusting the.

The present invention as described above has an effect of ensuring the portable Internet connectivity (preventing a coverage hole) by adjusting the signal strength (power) of other nearby Indian base stations in case of a failure of the indoor base stations.

In addition, the present invention has an effect that can effectively suppress the interference between the indoor base station and the interference between the indoor base station and the outdoor base station that may occur in correcting the failure of the indoor base station.

1 is a configuration diagram of an embodiment of the Indic portable Internet to which the present invention is applied;

2a to 2c are diagrams illustrating an embodiment of an indoor base station failure correction algorithm according to the present invention;

3 is a flowchart illustrating an embodiment of a method for correcting a failure of an indoor base station according to the present invention;

FIG. 4 is a diagram for explaining an indoor base station signal strength adjusting process according to a first embodiment of the present invention; FIG.

FIG. 5 is a diagram for explaining an indoor base station signal strength adjusting process according to a second embodiment of the present invention; FIG.

FIG. 6 is a diagram for explaining an indoor base station signal strength adjusting process according to a third embodiment of the present invention; FIG.

7 is a flowchart illustrating a procedure of adjusting an indoor base station signal strength according to a third embodiment of the present invention.

* Explanation of symbols on the main parts of the drawing

10: portable terminal

61: first indoor base station

62: second indoor base station

63: third indoor base station

64: fourth indoor base station

40: element management device

50: network management device

70: outdoor base station

The above objects, features, and advantages will become more apparent from the detailed description given hereinafter with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains may share the technical idea of the present invention. It will be easy to implement. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an embodiment of the Indic portable Internet to which the present invention is applied.

As shown in FIG. 1, the indoor portable Internet to which the present invention is applied includes indoor mobile terminals 10, a plurality of indoor base stations (Indoor RAS) 21 to 24, a router 30, and an element management device 40. ), And a network management device 50, the outdoor base station (Outdoor RAS) 70 is configured outdoors. Hereinafter, in the present invention, the network management device and the element management device will be described separately, but will be collectively used as a functional network management system. In addition, the mobile terminals may be classified into a dynamic mobile terminal having mobility and a static mobile terminal having no mobility.

Typically, the network management apparatus performs operations, management, and the like for the indoor portable Internet system, the outdoor portable Internet system, and the element management apparatus performs a function of managing each local network element such as a base station. . Here, network management data is transmitted and received between the network management device and the element management device using a SOAP communication method, an FTP communication method, and the like. For example, the element management device monitors the status of indoor indoor base stations using SNMP and reports the indoor base station status to the network management device 50 using FTP or the like.

In the present invention, when a specific Indian base station fails in a plurality of indoor base stations installed indoors, it is possible to adjust the signal strength (power) of other nearby Indian base stations to ensure portable Internet connectivity (avoid generation of coverage hole). For example, in the present invention, the network management device 50 adjusts the signal strength (power) of another indoor base station around the failed indoor base station adaptively to the failed indoor base station reported by the element management device 40. . Here, any device of the network management device 50 or the element management device 40 may perform the performing agent for adjusting the signal strength (power) of another indoor base station around the failing indoor base station.

In addition, in the present invention, in adjusting the indoor base station signal strength, an interference that may occur between the indoor base stations due to the change in the strength of the indoor base station signal (preferably, the increase in transmission power), the interference between the indoor base station and the outdoor base station, and the like. To effectively restrain Indian mobile Internet connectivity.

Next, the present invention will be described in detail with reference to FIGS. 2A to 7, and a case where a failure occurs in a "first indoor base station" having different reference numerals in each drawing will be described as an example.

2a to 2c are diagrams illustrating an embodiment of an indoor base station failure correction algorithm according to the present invention.

As shown in FIG. 2A, the element management apparatus 40 (or the network management apparatus) is provided through a failure notification of the first Indian base station 21 or a backbone disconnetion of the first Indian base station 21. 50, hereinafter referred to collectively as a network management system, recognizes that a failure occurs in the first indoor base station 21. Here, the failure notification of the indoor base station is performed through a fault alert message reported by the corresponding indoor base station.

As shown in FIG. 2B, the network management system recognizes that a failure has occurred in the first indoor base station 21, so that the network management system receives the other indoor base stations 22, preferably the second indoor base station 22 around the first indoor base station. And increase the signal strength (power) of the third indoor base station 23 and the fourth indoor base station 24. Accordingly, the mobile terminal 10 previously connected to the first inferior base station 21 in which the failure occurs includes a second indoor base station 22, a third indoor base station 23, and a fourth indoor base station around the first indoor base station. 24) Receives a signal from one of the indoor base stations and performs handover with the corresponding indoor base station to maintain the portable Internet connection. Here, the portable terminal 10 performs a handover with the indoor base station having the largest intensity (the strength of the pilot signal) received from the neighboring indoor base stations.

As shown in FIG. 2C, the network management system recognizes that the failure of the first indoor base station 21 has been recovered through the failure recovery notification of the first indoor base station 21 or the communication connection of the first indoor base station 21. In this case, the network management system reduces the signal strength of the second indoor base station 22, the third indoor base station 23, and the fourth indoor base station 24, which have increased the signal strength, to change the original signal strength. Accordingly, the mobile terminal, preferably still in the communication range of the first indoor base station 21, performs a handover with the first indoor base station 21 to establish a connection with the original indoor base station 21. Keep it. For example, since the signal strength of the first indoor base station 21 is the largest, the portable terminal 10 performs handover with the first indoor base station 21.

3 is a flowchart illustrating a method of correcting a fault of an indoor base station according to the present invention.

The first indoor base station 21 sends a fault alert message to the network management system as a failure occurs and notifies of the failure (301, 302). Here, the network management system may recognize the failure occurrence of the first indoor base station 21 through the communication disconnection of the first indoor base station 21 and the like.

Then, the network management system is based on the indoor base station information installed in the indoor space, and the other indoor base stations around the first indoor base station where the disturbance occurs, preferably the second indoor base station 22 and the third indoor language around the first indoor base station. The RF power increase message for increasing the signal strength of the base station 23 and the fourth indoor base station 24 is transmitted to the corresponding indoor base station (303 and 304).

Accordingly, the second indoor base station 22, the third indoor base station 23 and the fourth indoor base station 24 each transmit their own according to the signal strength value included in the RF power increase message. Each signal strength is increased (305). Here, the signal strength value is preferably set variably according to a portable Internet environment, preferably a base station environment on the Indic portable Internet.

Subsequently, as the first indoor base station 21 recovers from the failure, the first indoor base station 21 sends a failure recovery message to the network management system to notify the failure recovery fact (306, 307).

The network management system is then adapted to another Indian base station around the first indoor base station from which the fault has been recovered, preferably a second Indian base station 22, a third Indian base station 23 and a fourth Indian base station around the first Indian base station. A RF power restore message for restoring the signal strength of (24) to its original state is transmitted (308, 309).

Accordingly, each of the second indoor base station 22, the third indoor base station 23, and the fourth indoor base station 24 decreases its own transmission signal strength according to an RF power restore message. Change to the original signal strength (310).

As described above, a fault alert message, an RF power increase message, a fault recovery message, and a signal power recovery message are transmitted and received between the indoor base station and the network management system. ) Can use the specification defined in SNMP or define a new message specification.

Particularly, in the present invention, the network management system sends a signal strength increase message including a signal strength value to another Indian base station around the faulty indoor base station to correct the disturbance of the indoor base station. For example, it is necessary to prevent the interference between the indoor base stations and the interference between the indoor base stations and the outdoor base station due to the increase in the transmission power.

For example, as described above with reference to FIG. 3, the present invention increases the signal strength of other Indian base stations around a failed indoor base station. In the present invention, this is defined as "Indian base station signal strength adjustment algorithm according to the first embodiment".

4 is a diagram illustrating an embodiment of an indoor base station signal strength adjustment process according to the first embodiment of the present invention.

As shown in FIG. 4, the network management system sends a signal strength increase message including the signal strength value only to the neighboring indoor base station 42 of the failed indoor base station 41 to communicate with the corresponding indoor base station 42. Expand

However, the process of adjusting the indoor base station signal strength according to the first embodiment of the present invention can correct the failure of the indoor base station with a simple algorithm, but the interference between other indoor base stations indoors is increased due to the increase in the transmission signal strength of the specific indoor base station. There is a disadvantage that this may cause the performance of the indoor portable Internet. For example, in FIG. 4, since the transmission signal strength of the indoor base station 43 is equal to the original value (no change in the transmission signal strength), interference occurs between the indoor base station 43 and the indoor base station 42 having the changed transmission signal strength. Can be.

FIG. 5 is a diagram for explaining an indoor base station signal strength adjusting process according to a second embodiment of the present invention.

As shown in FIG. 5, the network management system sends a signal strength increase message including a signal strength value to all the indoor base stations 52, 53, 54 on the indoor mobile Internet to which the failed indoor base station 51 belongs. Extend the communication range of the corresponding Indian base stations 52, 53, 54 [Note; In the present invention, this is defined as "Indian base station signal strength adjustment algorithm" according to the second embodiment. Here, the signal strength value of the signal strength increase message for changing the signal strength of all the indoor base stations 52, 53, and 54 may be variably set according to a mobile Internet environment, preferably, a base station environment on the Indian mobile Internet. .

However, the process of adjusting the indoor base station signal strength according to the second embodiment of the present invention can also correct the Indian base station failure while preventing the occurrence of interference between the indoor base stations with a simple algorithm configuration, but the portable Internet power consumption may increase. Increasing the transmission signal strength of all Indian base stations may result in the degradation of outdoor portable Internet system due to interference between outdoor outdoor base stations. For example, in the second embodiment of the present invention, since the transmission signal strengths of all indoor base stations are equally increased, interference between indoor base stations does not occur.

FIG. 6 is an explanatory diagram illustrating an indoor base station signal strength adjustment process according to a third embodiment of the present invention, and FIG. 7 is a flowchart illustrating an indoor base station signal strength adjustment process according to a third embodiment of the present invention. to be. A third embodiment of the present invention will be described with reference to FIGS. 6 and 7, which are defined as "Indian base station signal strength adjustment algorithm" according to the third embodiment.

In the process of adjusting the indoor base station signal strength according to the third embodiment of the present invention, the increase of the transmission signal strength of the indoor base stations 62 located near the faulty indoor base station 61 is increased, and the vicinity of the failed indoor base station is increased. Increasing the transmission signal strength of the other indoor base stations 63, 64 is made small. For example, the transmission signal strength of each of the indoor base stations to which the transmission signal strength is to be changed is determined in inverse proportion to the distance between the failed indoor base stations and all of the indoor base stations on the indoor portable Internet.

In addition, in the indoor base station signal strength adjustment process according to the third embodiment of the present invention, the indoor base station to which the transmission signal strength is to be changed in adjusting the transmission signal strength of the indoor base stations 63 and 64 except for the vicinity of the faulty indoor base station On the basis of the channel state values of the mobile terminals connected to each other, it is determined whether each of the transmission signal strengths is reduced.

That is, when the network management system recognizes that the first Indian base station 61 has a failure (701), based on the indoor base station information installed in the indoor, all the Indian languages on the Indic portable Internet to which the first Indian base station in which the failure occurred are belonged. A signal strength increase message including the signal strength value is sent to the base stations 62, 63, and 64 to expand the communication range of the corresponding indoor base stations 62, 63, and 64 (702). In this way, the transmission signal strengths of all the indoor base stations 62, 63, and 64 are increased to the same magnitude. Here, the signal strength value of the signal strength increase message for changing the signal strength of all the indoor base stations 62, 63, and 64 may be set variably according to the mobile internet environment, preferably, the base station environment on the indoor mobile Internet. .

Then, the network management system replaces the indoor base stations 63 and 64 (except the indoor base station 62 near the failed indoor base station) other than the failed indoor base station. Set "(703). For example, for each of the indoor base stations other than the faulty indoor base station, the respective transmission signal strengths are changed to a small value. In this case, the respective transmission signal strengths are based on the channel state values of the mobile terminals connected to the indoor base stations. Decide whether to make it smaller.

Thereafter, the network management system grasps the channel state values of the mobile terminals connected to each indoor base station while gradually changing the transmitted signal strength of each indoor base station belonging to the set of indoor base station to be changed. (704). In this case, the network management system transmits an RF power decrease message to each of the indoor base stations belonging to the target indoor base station set to be smaller in the transmission signal strength to change the transmitted signal strength of the corresponding indoor base station smaller. In addition, the received signal strength (RSSI) may be used as the channel state value.

Thereafter, the network management system removes from the indoor base station set to be changed to the smallest signal strength of the internal base station set to the signal strength is smaller than the threshold value of each of the indoor base stations belonging to the set of the target indoor base station to be transmitted small change (unset) In step 705 and 706, no further transmission signal change procedure is performed for the removed indoor base station. Here, the removal of the indoor base station having the portable terminal channel state value less than or equal to the threshold from the set of internal base station to be changed to reduce the signal strength is to ensure the quality of the portable Internet connection of the mobile terminal connected to the indoor base station. That is, the fact that the channel state value of the portable terminal is lower than the threshold due to the small change in the transmission signal strength of the indoor base station is considered that the quality of the portable Internet connection may be lowered.

Thereafter, the network management system removes the indoor base stations that will not further reduce the transmission signal strength as described above with respect to the indoor base stations remaining in the small transmission source strength changing indoor base station set, and then the small transmission source strength changing indian base station. Each transmitted signal strength of the indoor base stations remaining in the set is changed until the original initial signal strength value is reached (707).

Subsequently, the network management system recognizes that the failure of the first Indian base station 61 in which the failure has occurred has been restored, and thus, all the Indian base stations 62 and 63 on the Indic mobile Internet to which the failed first Indian base station belongs. 64), an RF power restore message is sent to restore the transmission signal strength of each indoor base station.

As shown in FIG. 6, in the third embodiment of the present invention, the transmission signal strength of the indoor base station adjacent to the failed indoor base station is relatively larger than that of other indoor base stations, and the farther away from the failed indoor base station, the transmission is performed. It can be seen that the signal strength is relatively small. By doing so, there is an advantage of preventing the interference between the indoor base station and the interference between the indoor base station and the outdoor base station while ensuring the portable Internet connectivity of the mobile terminal connected to the other indoor base station other than the failed indoor base station. In addition, in the third embodiment of the present invention, the interference between the indoor base stations is increased by increasing the transmission signal strength of the indoor base stations, but it can be confirmed that the increased interference is equally divided between the indoor base stations.

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

Claims (21)

In the network management system to correct the failure of the indoor base station, A transmission signal strength changing step of changing a transmission signal strength of another indoor base station in the indoor language to which the failed indoor base station belongs by recognizing a failure of a specific indoor base station; And Transmission signal strength recovery step of restoring the transmission signal strength of the other Indian base station that changed the transmission signal strength according to recognizing the failure recovery of the faulty indoor base station Method for correcting the failure of the indoor base station comprising a. The method of claim 1, The step of changing the transmission signal strength, And changing a transmission signal strength of the other indoor base station located near the failed indoor base station. The method of claim 1, The step of changing the transmission signal strength, And changing a transmission signal strength of all other Indian base stations in the indoor language to which the faulty indoor base station belongs. The method according to any one of claims 1 to 3, The step of changing the transmission signal strength, And transmitting the signal strength increase message to the indoor base station to which the transmission signal strength is to be changed, thereby increasing the transmission signal strength of the indoor base station to which the transmission signal is to be changed. The method according to any one of claims 1 to 3, The transmission signal strength recovery step, Transmitting a signal strength recovery message to another Indian base station that has changed the transmission signal strength, thereby changing the transmission signal strength of the other Indian base station that changed the transmission signal strength, the method of correcting the fault of the indoor base station . In the system for correcting the failure of the indoor base station, At least one indoor base station whose strength of the transmitted signal is adjusted according to control from the network management system; And The network management system for adjusting the transmission signal strength of another indoor base station among the indoor base stations when a failure occurs in a specific indoor base station of the indoor base stations System for correcting the failure of the indoor base station comprising a. The method of claim 6, The network management system, And a transmission signal strength of another indoor base station located near the failed indoor base station. The method of claim 6, The network management system, And a system for changing a transmission signal strength of all other Indian base stations in the indoor language to which the failed Indian base station belongs. The method according to any one of claims 6 to 8, Each of the other Indian base stations is And adjusting its transmission signal strength according to the signal strength value of the signal strength adjustment message received from the network management system. In the network management system to correct the failure of the indoor base station, A transmission for changing a transmission signal strength of the other indoor base station based on the location between the failed indoor base station and another indoor base station and the channel state value of the mobile terminal connected to the other indoor base station as the failure of the specific indoor base station is recognized. Changing signal strength; And Transmission signal strength recovery step of restoring the transmission signal strength of the other Indian base station that changed the transmission signal strength according to recognizing the failure recovery of the faulty indoor base station Method for correcting the failure of the indoor base station comprising a. The method of claim 10, The step of changing the transmission signal strength, A first step of increasing the transmission signal strength of all other Indian base stations in the indoor language to which the failing indoor base station belongs; And A second process of gradually reducing the transmission signal strength of each of the remaining indoor indian base stations based on a channel state value of the mobile terminal connected to the remaining indoor indian base station other than the faulty indoor base station; Method for correcting the failure of the indoor base station comprising a. The method of claim 11, The first process, And transmitting a signal strength increase message to all the other indoor base stations, thereby increasing the transmission signal strengths of all the other indoor base stations to the same magnitude. The method of claim 11, The second process, And a method for correcting a fault of an indoor base station among the remaining indoor base stations, wherein the transmission signal strength is no longer reduced for an indoor base station having a portable terminal channel state value less than or equal to a threshold. The method of claim 11, The second process, The method for compensating for a fault of an indoor base station among the remaining indoor base stations gradually decreases the transmission signal strength until the original initial signal strength value is reached for the indoor base station having a mobile terminal channel state value equal to or greater than a threshold. The method according to any one of claims 11 to 14, The second process, A method for compensating for a failure of an indoor base station, characterized by reducing the transmitted signal strength of the indoor base station by sending a signal strength reduction message to a target indoor base station to change the transmission signal strength small. The method according to any one of claims 11 to 14, Wherein the channel state value comprises a received signal strength (RSSI). The method according to any one of claims 10 to 14, The transmission signal strength recovery step, Transmitting a signal strength recovery message to another Indian base station that has changed the transmission signal strength, thereby changing the transmission signal strength of the other Indian base station that changed the transmission signal strength, the method of correcting the fault of the indoor base station . In the system for correcting the failure of the indoor base station, At least one indoor base station whose strength of the transmitted signal is adjusted according to control from the network management system; And In the case of a failure of a specific Indian base station among the indoor base stations, the transmission signal strength of the other indoor base station is determined based on the location between the failed indoor base station and another indoor base station and the channel state value of the mobile terminal connected to the other indoor base station. The network management system to coordinate System for correcting the failure of the indoor base station comprising a. The method of claim 18, The network management system, And recovering the transmission signal strengths of the other Indian base stations which have adjusted the transmission signal strength when the failure of the faulty indoor base station is restored. The method of claim 18 or 19, The network management system, In the state where the transmission signal strengths of all other Indian base stations in the indoor language to which the faulty Indian base station belongs are increased, based on the channel state value of the mobile terminal connected to the remaining Indian base stations other than the vicinity of the faulty Indian base station, A system for compensating for failure of an indoor base station, characterized in that the transmission signal strength is gradually decreased. The method of claim 20, The network management system, Among the remaining Indic base stations, the transmit signal strength is not reduced any more for an Indic base station whose portable terminal channel state value is less than or equal to the threshold, and the transmit signal strength is set to the original initial signal strength value for the Indic base station whose portable terminal channel state value is greater than or equal to the threshold. Gradually correcting until the faulty system of the indoor base station.