JP2007110657A - System, method and program for improving communication quality by specifying communication failure factor, mobile communication terminal and radio management station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain improvement in communication quality by specifying a transmission failure factor at a mobile communication terminal side or at a network side. <P>SOLUTION: The present invention comprises: a second latest transmission/reception signal holding section 300A of a radio management station; a communication failure factor judgement section 100D for judging a communication failure factor based on a latest transmission signal and a latest reception signal; of the radio management station held in the second latest transmission/reception signal holding section and a latest transmission signal and a latest reception signal in a mobile communication terminal held in a first latest transmission/reception signal holding section 100C; a communication failure information holding section 300B for holding, for each base station, the communication failure factor and communication transmission power from the communication failure factor judgement section and a latest transmission/reception power information holding section 100B for each mobile communication terminal; and a transmission power increase request section 300C for requesting increase in transmission power to a plurality of base stations when reception power of the plurality of mobile communication terminals is low and there are a lot of communication failures from the radio management station, and requesting increase in transmission power to a plurality of mobile communication terminals when transmission power of the plurality of mobile communication terminals is low and there are a number of transmission failures from the plurality of mobile communication terminals. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication quality improvement system for performing communication in a radio section between a base station controlled by a radio management station and a mobile communication terminal. In particular, the present invention relates to a communication quality improvement system, method, program, and mobile communication by specifying a communication failure factor for a communication error such as an electric field failure in a radio section, interference with a desired wave due to an interference wave, and a phase shift between a network and a mobile communication terminal. The present invention relates to a terminal and a radio management station.

When communication fails between the mobile communication terminal and the base station due to a communication error such as an electric field failure in the radio section, interference with the desired wave due to interference waves, or a phase shift between the network and the mobile communication terminal, as follows: There is.
FIG. 11 is a diagram for explaining an example of a communication failure occurrence event in a radio section of a mobile communication terminal. As shown in the figure, a delivery confirmation signal is notified from the network side to the transmission of the data signal from the mobile communication terminal. As an example of a communication failure occurrence event, the data signal (1 ), (2), and (3) are transmitted in order. On the other hand, the mobile communication terminal receives the delivery confirmation signal for the data signal (1) and the delivery confirmation signal for the data signal (2) from the network side. If the delivery confirmation signal (3) cannot be received, it is determined that communication has failed.

As shown in this figure, there are two types of communication failure, communication failure factor 1 and communication failure factor 2.
In communication failure factor 1, data signals (1), (2), (3) are transmitted in order from the mobile communication terminal to the network side, and the data signals (1), (2) are received on the network side. The data signal (1) delivery confirmation signal and the data signal (2) delivery confirmation signal are transmitted from the mobile communication terminal to the mobile communication terminal, but the data signal (3) may not be received on the network side. The delivery confirmation signal of (3) is not transmitted, and therefore, the delivery confirmation signal of the data signal (3) is not received by the mobile communication terminal. That is, the communication failure factor 1 is caused by the transmission failure of the mobile communication terminal.

  In communication failure factor 2, data signals (1), (2), (3) from the mobile communication terminal to the network side are sequentially performed, and a delivery confirmation signal for the data signal (1) is transmitted from the network side to the mobile communication terminal. The data signal (2) delivery confirmation signal and the data signal (3) delivery confirmation signal are transmitted, and the mobile communication terminal transmits the data signal (1) delivery confirmation signal and the data signal (2) delivery confirmation signal from the network side. May be received, but the acknowledgment signal of the data signal (3) may not be received. That is, the communication failure factor 2 is caused by transmission failure on the network side.

Thus, since the communication failure factor 1 is caused by a transmission failure of the mobile communication terminal and the communication failure factor 2 is caused by a transmission failure on the network side, the communication failure factor 1 and the communication failure factor 2 can be specified at the time of communication failure. Otherwise, there is a problem that communication quality cannot be improved.
Although it is possible to retransmit the data signal even if the communication failure factor 1 and the communication failure factor 2 cannot be specified, in order to improve the communication quality by reducing the retransmission as much as possible, the communication failure factor 1, communication It is necessary to identify failure factor 2.

  Conventionally, even if a call cannot be made due to quality degradation during a call (communication) using a mobile communication device, a wireless base In a mobile communication device that communicates with or communicates with other mobile communication devices, mobile terminal devices, or fixed telephones via a connection with a station, such as an abnormality in a line state that does not involve the user of the mobile communication device If there is a disconnection due to a cause, the end-of-call process is performed. If the machine is on the incoming side, outgoing calls are prohibited, and if the own machine is on the outgoing side, re-transmission processing is executed. , There is something that is surely received (for example, , See Patent Document 1).

However, although the said patent document 1 communicates with a mobile communication apparatus via a connection with a base station, the transmission failure factor of a mobile communication terminal and the transmission failure factor on the network side are specified, and communication is performed. It does not improve quality.
Conventionally, in video code communication quality evaluation and transmission control, with the same level of detection accuracy as the comparison of original images, and with a processing scale close to the case of detecting from the received code alone, the video quality deteriorates along with the evaluation of video relay equipment. In order to provide a device that performs transmission control so as to suppress degradation and suppress deterioration, a moving image code transmission checker and a moving image code reception checker are connected to a moving image code transmitter and a moving image code receiver, respectively, In some cases, the number of parameters is counted and the inspection result at the time of transmission is also communicated to the receiving side to reduce detection omission (see, for example, Patent Document 2).

However, although the above-mentioned patent document 2 detects the degradation of the moving image quality, it does not specify the transmission failure factor of the mobile communication terminal and the transmission failure factor on the network side.
In addition, in order to obtain quality information from the mobile communication terminal device that is actually used by the user without going to the site and to maintain and improve the communication quality in the service area, the mobile device is outside the service area, Or, if a communication error occurs at a point where radio wave conditions are bad, the mobile device stores the time, location, and cause of communication error in a built-in storage device, and then moves to a place where the call can be made and the call is successful. Error information that has been accumulated is sent to the network, and the network forwards the received error information to the management server system. The management server system performs statistical processing based on time, location, and causes of communication abnormalities. There is also one that analyzes a problematic point to determine the effectiveness for improvement (see, for example, Patent Document 3).

However, although the above-mentioned patent document 3 transmits the cause of communication abnormality to the network at a place where it can be transmitted and attempts to improve the communication quality from the statistics of the result, the determination of the cause of communication failure is the mobile communication terminal side. Therefore, it is not specified whether the mobile communication terminal transmission failure or the network side transmission failure.
Conventionally, in order to reduce the operating cost by making it possible to create a dead zone information map with a simple device, the mobile station constantly outputs its own location information to the mobile station, A location information storage means of the own station at the time of communication disconnection due to occurrence, and a location information sending means for sending this location information to the base station using a control channel after establishing a communication line at the next call access; The received base station is provided with position information notifying means for notifying the monitoring station of this position information, and the monitoring station is provided with position information storing means for receiving and storing the position information, and the accumulated abnormal ending There is also a configuration in which a dead zone map creating means for creating a dead zone map by editing statistical processing of position information is provided (see, for example, Patent Document 4).

However, in Patent Document 4 described above, the location information is output from the mobile station to the base station, and the base station notifies the monitoring station of the location information. However, the transmission failure of the mobile communication terminal or the transmission failure on the network side It does not specify whether there is any.
In addition, conventionally, in order to provide a method and apparatus for calculating traffic distribution in a base station in a mobile communication system and accurately and simply calculating quality in the base station, the area data holding unit transmits transmission power Pi for each area, and The data of the call volume Ai is held, the propagation specification data holding unit holds data such as the antenna ground height of the base station and the mobile station used for calculation of the received power, and the received power calculation unit is the area data holding unit The necessary data is read from the propagation data storage unit and the received power is calculated. The traffic calculation unit calculates the average Sm and the variance Sv of the traffic in the base station from the data calculated by the received power calculation unit. In the quality calculator, the average Sm and variance Sv calculated by the traffic calculator and the threshold T provided by the threshold generator Used to calculate the quality such as loss probability, some output (e.g., see Patent Document 5).
However, Patent Document 1 calculates the quality of a base station by calculating quality such as a call loss rate based on received power or the like, but it is a transmission failure of a mobile communication terminal or a transmission failure on the network side. It does not specify that.

JP 2003-158769 A JP 2002-44691 A JP 2002-271833 A JP-A-5-336564 JP 2001-217786 A

  Therefore, in view of the above problems, the present invention identifies a transmission failure factor of a mobile communication terminal, a transmission failure factor on the network side, and a communication quality improvement system, a method, and a communication failure factor identification for improving communication quality, An object is to provide a program, a mobile communication terminal, and a radio management station.

  In order to solve the above problems, the present invention provides communication quality by specifying a communication failure factor of mobile communication terminals that are connected to each other and are located in each area of a plurality of base stations managed by each radio management station. In the improvement system, the transmission power of the transmission signal transmitted by the mobile communication terminal, the transmission / reception power measurement unit for measuring the reception power of the received reception signal, and the transmission power measured by the transmission / reception power measurement unit for the latest transmission / reception signal, The latest transmission / reception power information holding unit for holding received power, the latest transmission signal transmitted / received by the mobile communication terminal, the first latest transmission / reception signal holding unit for holding the latest reception signal, and the radio management station The latest transmission signal transmitted / received from the mobile communication terminal located in the base station being in service, the second latest transmission / reception signal holding unit holding the latest reception signal, and the mobile communication terminal that failed to communicate The latest transmission signal and the latest reception signal of the radio management station held in the second latest transmission / reception signal holding unit, and the latest transmission signal and the latest reception signal of the radio management station. And the latest transmission signal at the mobile communication terminal held in the first latest transmission / reception signal holding unit, transmission failure from the base station as a communication failure factor based on the latest reception signal, or from the mobile communication terminal A communication failure factor determining unit that determines a transmission failure, the communication failure factor determining unit of each mobile communication terminal that has failed in communication, a communication failure factor notified to the radio management station from the latest transmission / reception power information holding unit, and a communication transmission power A communication failure information holding unit for each base station, a communication failure factor held in the communication failure information holding unit, and a communication transmission power. When there are many communication failures from a station, when requesting an increase in transmission power to a plurality of base stations, or when the transmission power of a plurality of mobile communication terminals is generally low and there are many transmission failures from a plurality of mobile communication terminals A communication quality improvement system by specifying a communication failure factor is provided, comprising: a transmission power increase request unit that requests a plurality of mobile communication terminals to increase transmission power.

  Further, the communication failure factor determination unit determines that the mobile communication terminal has failed to transmit when transmitting a transmission signal from the mobile communication terminal to the radio management station and cannot receive the transmission signal by the radio management station. When the confirmation signal cannot be received by the mobile communication terminal, it is determined that the transmission of the base station has failed. Further, when the transmission signal is transmitted from the radio management station to the mobile communication terminal, the transmission signal cannot be received by the mobile communication terminal. If it is determined that the transmission of the base station has failed and the radio management station cannot receive the transmission confirmation signal, it is determined that the mobile communication terminal has failed to transmit.

  Further, the transmission power increase request unit sets a limit value for the sum of transmission powers of a plurality of mobile communication terminals residing in each base station, and further includes a plurality of mobile communication terminals residing in each base station. If an average limit value of received power is set and the sum of the transmission power of multiple mobile communication terminals located in each base station has a margin for the limit value, a marginal transmission is made to the mobile communication terminal that has failed in communication. When the increase in power is distributed and the average of the received power of a plurality of mobile communication terminals located in each base station has a margin with respect to the limit value, the transmission power of the base station is increased by the margin.

  Furthermore, the present invention provides the communication quality improvement method by specifying a communication failure factor of a mobile communication terminal that is connected to each other and is located in each area of a plurality of base stations managed by each radio management station. A step of measuring a transmission power of a transmission signal transmitted by a communication terminal, a reception power of a received reception signal, a step of holding the transmission power measured by the transmission / reception power measurement unit for the latest transmission / reception signal, and the reception power; The latest transmission signal transmitted / received by the mobile communication terminal, the step of holding the latest reception signal, the latest transmission signal transmitted / received from the mobile communication terminal located in the base station in charge by the radio management station, the latest A step of holding a received signal; and for the mobile communication terminal that has failed to communicate, to notify the latest transmission signal of the held radio management station, the latest received signal, New transmission signal, latest reception signal and latest transmission signal at the mobile communication terminal held, transmission failure from the base station as a cause of communication failure based on the latest reception signal, or transmission from the mobile communication terminal A step of determining failure, a communication failure factor notified to the radio management station from each mobile communication terminal that has failed in communication, a step of holding communication transmission power for each base station, a held communication failure factor, and communication transmission power Based on the above, when the reception power of a plurality of mobile communication terminals is generally low and there are many communication failures from the radio management station, it is requested to increase the transmission power to a plurality of base stations, or generally a plurality of mobile communication terminals And a step of requesting the plurality of mobile communication terminals to increase the transmission power when transmission power from the plurality of mobile communication terminals is high. Goods To provide a method for improving.

  Furthermore, the present invention performs communication quality improvement by specifying a communication failure factor of a mobile communication terminal located in each area of a plurality of base stations managed by each radio management station, where the radio management stations are connected to each other. In the program, the procedure for measuring the transmission power of the transmission signal transmitted by the mobile communication terminal and the reception power of the received reception signal, and the transmission power and reception power measured by the transmission / reception power measurement unit for the latest transmission / reception signal are retained. The latest transmission signal transmitted / received by the mobile communication terminal, the procedure for retaining the latest received signal, and the latest transmitted / received from the mobile communication terminal residing in the base station in charge at the radio management station. Procedure for holding transmission signal, latest reception signal, and latest transmission signal, latest reception signal of radio management station held for mobile communication terminal that failed to communicate The latest transmission signal in the radio management station, the latest reception signal, the latest transmission signal in the mobile communication terminal held and the transmission failure from the base station as a cause of communication failure based on the latest reception signal Or, a procedure for determining a transmission failure from the mobile communication terminal, a communication failure factor notified to the radio management station from each mobile communication terminal that failed to communicate, a procedure for holding the communication transmission power for each base station, and Based on the cause of communication failure and communication transmission power, if the reception power of multiple mobile communication terminals is generally low and there are many communication failures from the radio management station, multiple base stations are requested to increase the transmission power. Or, when the transmission power of the plurality of mobile communication terminals is low as a whole and there are many transmission failures from the plurality of mobile communication terminals, a procedure for requesting the plurality of mobile communication terminals to increase the transmission power is provided. Be Providing a program for executing the communication quality by the communication failure factors identified by the computer.

  Furthermore, the present invention is a mobile communication terminal in which radio management stations are connected to each other, located in each area of a plurality of base stations managed by each radio management station, and performing communication quality improvement by specifying a communication failure factor, A transmission / reception power measurement unit that measures the transmission power of the transmission signal transmitted by the mobile communication terminal and the reception power of the received reception signal, and holds the transmission power and reception power measured by the transmission / reception power measurement unit for the latest transmission / reception signal The latest transmission / reception power information holding unit, the latest transmission signal transmitted / received by the mobile communication terminal, the first latest transmission / reception signal holding unit holding the latest reception signal, and the wireless communication terminal with respect to the mobile communication terminal having failed in communication Before being held in the second latest transmission / reception signal holding unit holding the latest transmission signal and the latest reception signal transmitted / received from the mobile communication terminal located in the base station in charge at the management station The mobile communication terminal which is informed of the latest transmission data and the latest reception data of the radio management station and is held in the latest transmission data and the latest reception data and the first latest transmission / reception signal holding unit in the radio management station Communication failure factor determination unit for determining transmission failure from the base station or transmission failure from the mobile communication terminal as a communication failure factor based on the latest transmission data and latest reception data in each mobile communication The communication failure factor determining unit of the terminal, the communication failure factor notified to the radio management station from the latest transmission / reception power information holding unit, and the communication held in the communication failure information holding unit holding the communication transmission power for each base station Based on the cause of failure and communication transmission power, if the received power of multiple mobile communication terminals is generally low and there are many communication failures from the radio management station, request multiple base stations to increase the transmission power Or when the transmission power of a plurality of mobile communication terminals is low as a whole, and when there are many transmission failures from a plurality of mobile communication terminals, it is characterized in that a plurality of mobile communication terminals are requested to increase transmission power. Provided is a mobile communication terminal that improves communication quality by specifying a cause of communication failure.

  Furthermore, the present invention relates to a radio management station that manages a plurality of base stations in which a mobile communication terminal is located in the area of the base station and improves communication quality by specifying a communication failure factor of the mobile communication terminal. The latest transmission signal transmitted / received from the mobile communication terminal located in the base station in charge, the second latest transmission / reception signal holding unit holding the latest reception signal, and the mobile communication terminal having failed in communication, The latest transmission signal and the latest reception signal of the radio management station held in the second latest transmission / reception signal holding unit are notified, the latest transmission signal and the latest reception signal at the radio management station, and the movement Communication failure based on the latest transmission signal and the latest reception signal at the mobile communication terminal held in the first latest transmission / reception signal holding unit holding the latest transmission signal and the latest reception signal transmitted and received at the communication terminal As a factor A communication failure factor determination unit that determines transmission failure from the ground station or transmission failure from the mobile communication terminal, and for the latest transmission / reception signal, transmission power of the transmission signal transmitted by the mobile communication terminal, reception of the received reception signal Transmission failure measured by a transmission / reception power measurement unit that measures power, communication failure factor notified to the radio management station from the latest transmission / reception power information holding unit that holds reception power, and communication that holds communication transmission power for each base station Based on the failure information holding unit, the cause of communication failure held in the communication failure information holding unit, and the communication transmission power, the received power of a plurality of mobile communication terminals is generally low, and there are many communication failures from the radio management station Requesting an increase in transmission power to a plurality of base stations, or when the transmission power of a plurality of mobile communication terminals is generally low and there are many transmission failures from a plurality of mobile communication terminals, Characterized in that it comprises a transmission power increase request unit for requesting an increase in transmit power to the moving communication terminal, to provide a wireless control station to perform communication quality by the communication failure factors identified.

  As described above, according to the present invention, the transmission power of the transmission signal transmitted from the mobile communication terminal and the reception power of the received reception signal are measured, and the transmission power measured by the transmission / reception power measurement unit for the latest transmission / reception signal. The latest transmission signal that has received power and was transmitted / received by the mobile communication terminal, the latest transmission signal that has been received and transmitted from the mobile communication terminal located in the base station in charge at the radio management station Signal, the latest reception signal is held, and the latest transmission signal of the held radio management station is notified to the mobile communication terminal that failed to communicate, the latest reception signal, and the latest transmission signal at the radio management station, Based on the latest received signal and the latest transmission signal held in the mobile communication terminal, the latest reception signal, and the communication failure factor as a cause of communication failure, or the transmission failure from the mobile communication terminal is judged and communication is performed. failed The communication failure factor and communication transmission power notified from the mobile communication terminal to the radio management station are held for each base station, and the received power of a plurality of mobile communication terminals as a whole is based on the held communication failure cause and communication transmission power. Is low and there are many communication failures from the radio management station, it is requested to increase the transmission power to a plurality of base stations, or the transmission power of a plurality of mobile communication terminals is generally low, When there are many transmission failures, we requested to increase the transmission power to multiple mobile communication terminals, so the communication failure factor was determined based on the latest transmission signal and the latest reception signal of the mobile communication terminal when communication failed. Therefore, it is possible to specify an accurate cause of communication failure. Furthermore, since an accurate cause of communication failure is clarified, it is possible to request the mobile communication terminal and the base station to increase transmission power, and it is possible to improve communication quality.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a communication system of a mobile communication terminal according to a communication quality improvement system by specifying a communication failure factor according to the present invention. The communication quality improvement system by specifying the cause of communication failure according to the present invention executes the improvement of the communication quality of the communication system 500 of the mobile communication terminal shown in the figure by program control of a computer.

  A plurality of radio management stations 300 and 310 are connected to a communication system 500 of a mobile communication terminal via a network 400, and a plurality of base stations 200 are connected to each radio management station 300, and a plurality of radio management stations 310 are connected to each radio management station 310. Are connected to each other, and a plurality of mobile communication terminals 100 that perform communication using transmission and reception waves are located in the area of the base station zone of each base station 200. A plurality of mobile communication terminals 110 that perform communication using transmission / reception waves exist.

Here, the radio management station 300 has jurisdiction over a plurality of base stations 200, and logically controls and supervises transmission / reception by transmission / reception waves between each base station 200 and a plurality of mobile communication terminals 100 in the area, The radio management station 310 has jurisdiction over a plurality of base stations 210, and logically controls and supervises transmission / reception by transmission / reception waves between each base station 210 and a plurality of mobile communication terminals 110 in the area.
Each base station 200 is a station that has jurisdiction over the area of the base station zone in which a plurality of mobile communication terminals 100 are present, relays to the plurality of mobile communication terminals 100, and physically transmits / receives waves to / from the plurality of mobile communication terminals 100. In addition, each base station 210 is a station that has jurisdiction over the area in the base station zone in which a plurality of mobile communication terminals 110 are present, relays to the plurality of mobile communication terminals 110, and a plurality of mobile communication terminals 100 is physically transmitted and received with a transmission / reception wave.

Here, it is assumed that the mobile communication terminals 100 and 110 are communicating with each other.
Hereinafter, mobile communication terminal 100 (110) and radio management station 300 (310) will be described in detail.
FIG. 2 is a block diagram illustrating a schematic function of the mobile communication terminal 100 (110) in FIG. As shown in the figure, the mobile communication terminal 100 is provided with a transmission / reception power measurement unit 100A, and the transmission / reception power measurement unit 100A receives received power from the base station 200 during communication between the mobile communication terminal 100 and the base station 200, The transmission power to the base station 200 is periodically measured.

Furthermore, the latest transmission / reception power information holding unit 100B is provided in the mobile communication terminal 100, and the latest transmission / reception power information holding unit 100B holds the latest reception power and the latest transmission power measured by the transmission / reception power measurement unit 100A. The latest reception power information and the latest transmission power information held at the time of failure are transmitted to the radio management unit 300.
Further, the mobile communication terminal 100 is provided with a latest transmission / reception signal holding unit 100C, which holds the latest transmission signal transmitted to the radio management station 300 and the latest reception signal received from the radio management station 300. To do.

Further, the mobile communication terminal 100 is provided with a communication failure factor determination unit 100D. The communication failure factor determination unit 100D makes an inquiry to the radio management station 300 from the mobile communication terminal 100, and performs communication based on information from the radio management station 300. The failure factor is determined, and the wireless management station 300 is notified of the determination result of the communication failure factor and the reception power and transmission power when the communication fails.
The same applies to the mobile communication terminal 110.

FIG. 3 is a block diagram illustrating a schematic function of the radio management station 300 (310) in FIG. As shown in the figure, the radio transmission / reception station 300 is provided with a latest transmission / reception signal holding unit 300A. The latest transmission / reception signal holding unit 300A receives the latest data signal received from a plurality of mobile communication terminals 100 and a plurality of mobile communication terminals 100. The latest delivery confirmation signal transmitted to is held.
The radio transmission / reception station 310 includes a latest transmission / reception signal holding unit 310 </ b> A. The latest transmission / reception signal holding unit 310 </ b> A includes the latest transmission signal transmitted to the plurality of mobile communication terminals 110 and the latest reception signal received from the plurality of mobile communication terminals 110. Hold.

Further, the wireless management station 300 is provided with a communication failure information holding 300B. The communication failure information holding 300B is based on the communication failure factor, communication transmission power, and reception power information notified from the plurality of mobile communication terminals 100 that have failed to communicate. Hold for each station.
Further, the radio management station 300 is provided with a transmission power increase request unit 300C. The transmission power increase request unit 300C includes a plurality of mobile communication terminals 100 communication failure factors, transmission power, and reception held in the communication failure information holding unit 300B. Analyzing based on the power, when the received power of the plurality of mobile communication terminals 100 is generally low and there are many communication failures from the radio management station 300, requesting the plurality of base stations 200 to increase the transmission power, or In general, when the transmission power of the plurality of mobile communication terminals is low and there are many transmission failures from the plurality of mobile communication terminals 100, the mobile communication terminals 100 are requested to increase the transmission power.

The same applies to the radio management station 310.
FIG. 4 is a sequence diagram for explaining an operation example of the communication system of the mobile communication terminal in FIG. As shown in this figure, it is assumed that a data signal is transmitted from the mobile communication terminal 100 to the mobile communication terminal 110, and the data signal to be transmitted is the data signal (1), the data signal (2),. In this way, numbers are added in the order of transmission, and data signals (1), data signals (2),..., And data signals (n) are transmitted in this order.

  When the data signal (1), the data signal (2),..., The data signal (n) are transmitted from the mobile communication terminal 100 to the radio management station 300 through the relay of the base station 200, the radio management station 300 transmits the data signal (n). The acknowledgment signal (1) of the data signal (1) and the data signal (2) as the acknowledgment signal to which the number corresponding to the number of the data signal is added as the acknowledgment signal for each data signal to the mobile communication terminal 100 by relay. ) Delivery confirmation signal (2),..., Data signal (n) delivery confirmation signal (n) is transmitted.

The mobile communication terminal 100 confirms that the data signal has been transmitted to the radio management station 300 upon receipt of the delivery confirmation signal from the radio management station 300.
Thus, when transmitting a plurality of data signals, the mobile communication terminal 100 receives the delivery confirmation signal and then transmits the next data signal.
Further, the transmission / reception power measurement unit 100A of the mobile communication terminal 100 receives the transmission power of the data signal (1), the reception power of the delivery confirmation signal (1), the transmission power of the data signal (2), and the reception confirmation signal (2). The power, ..., the transmission power of the data signal (n) and the reception power of the delivery confirmation signal (n) are measured.

A data signal (1), a data signal (2),... Are transmitted from the wireless management station 300 to the wireless management station 310 via the network.
When the data signal (1), the data signal (2),..., The data signal (n) are transmitted from the radio management station 310 to the mobile communication terminal 110 through the relay of the base station 210, the radio management station 310 transmits the data signal (n). The acknowledgment signal (1) of the data signal (1) and the data signal (2) as the acknowledgment signal to which the number corresponding to the number of the data signal is added as the acknowledgment signal for each data signal to the mobile communication terminal 110 by relay. ) Delivery confirmation signal (2),..., A data signal (m) delivery confirmation signal (m) is transmitted.

Radio management station 310 confirms that a data signal has been transmitted to mobile communication terminal 110 upon receipt of a delivery confirmation signal from mobile communication terminal 110.
Thus, when transmitting a plurality of data signals, the radio management station 310 transmits the next data signal after receiving the delivery confirmation signal.
Further, the transmission / reception power measuring unit 110A of the mobile communication terminal 110 transmits the reception power of the data signal (1), the transmission power of the acknowledgment signal (1), the reception power of the data signal (2), and the transmission of the acknowledgment signal (2). The received power of the data signal (m) and the transmission power of the acknowledgment signal (m) are measured.

  Here, in the mobile communication terminal 100, the radio management station 300 receives the transmission of the data signal (n) to the radio management station 300 and receives the data signal (n) delivery confirmation signal (n) from the radio management station 300. If there is a transmission failure of the base station 200 when transmitting the transmission confirmation signal (n) of the data signal (n) from the base station 200 cannot be received, resulting in a communication failure. This communication failure corresponds to communication failure factor 2 described above.

  On the other hand, if there is a transmission failure of the mobile communication terminal 100 when transmitting the data signal (n) from the mobile communication terminal 100 to the radio management station 300, the radio management station 300 cannot receive the data signal (n), and radio management is performed. The station 300 cannot transmit the delivery confirmation signal (n) of the data signal (n), and the mobile communication terminal 100 cannot receive the delivery confirmation signal (n) of the data signal (n), resulting in communication failure. (Not shown). This communication failure corresponds to the communication failure factor 1 described above.

  Further, if there is a transmission failure of the mobile communication terminal 110 when the transmission confirmation signal (m) of the data signal (m) is transmitted from the mobile communication terminal 110 to the radio management station 320, the radio management station 310 transmits the data signal (m). Communication confirmation signal (m) cannot be received, data signal (m + 1) cannot be transmitted from radio management station 310, and mobile communication terminal 110 cannot receive data signal (m + 1), resulting in communication failure. It becomes. This communication failure corresponds to the communication failure factor 1 described above.

  On the other hand, in the mobile communication terminal 110, the wireless management station 310 receives the transmission confirmation signal (m) of the data signal (m) to the wireless management station 310 and receives the data signal (m + 1) from the wireless management station 310. If there is a transmission failure of the base station 200 during transmission, the data signal (m + 1) from the base station 200 cannot be received, resulting in a communication failure (not shown). This communication failure corresponds to communication failure factor 2 described above.

FIG. 5 is a diagram illustrating the latest transmission / reception signal holding unit 100C in the mobile communication terminal 100 and the latest transmission / reception signal held in the latest transmission / reception signal holding unit 110C in the mobile communication terminal 110 when communication fails.
At the time of communication failure in the operation example of FIG. 4, as shown in FIG. 5A, the latest transmission / reception signal holding unit 100 </ b> C in the mobile communication terminal 100 has a data signal (n) as the latest transmission signal and the latest reception signal. As a result, a delivery confirmation signal (n-1) is held.

When the communication in the operation example of FIG. 4 fails, as shown in FIG. 5B, the latest transmission / reception signal holding unit 110C in the mobile communication terminal 110 receives the delivery confirmation signal (m) as the latest transmission signal and the latest reception signal. A data signal (m) is held as a signal.
FIG. 6 is a diagram for explaining the latest transmission signal and the latest reception signal held in the latest transmission / reception signal holding unit 300A in the radio management station 300 and the latest transmission / reception signal holding unit 310A in the radio management station 310 when communication fails.

When communication fails in the operation example of FIG. 4, as shown in FIG. 6A, the latest transmission / reception signal holding unit 300 </ b> A in the radio management station 300 is connected to each mobile communication terminal 100 located in each base station 200. Thus, the delivery confirmation signal (n) is held as the latest transmission signal, and the data signal (n) is held as the latest reception signal.
At the time of communication failure in the operation example of FIG. 4, as shown in FIG. 6B, the latest transmission / reception signal holding unit 310 </ b> A in the radio management station 310 is connected to each mobile communication terminal 110 located in each base station 210. Thus, the data signal (m) is held as the latest transmission signal, and the delivery confirmation signal (m-1) is held as the latest reception signal.

FIG. 7 is a diagram for explaining information on the latest transmission / reception power information holding unit 100B in the mobile communication terminal 100 and the latest transmission power and latest reception power held in the latest transmission / reception power information holding unit 110B in the mobile communication terminal 110 when communication fails. It is.
At the time of communication failure in the operation example of FIG. 4, as shown in FIG. 7A, the latest transmission / reception power information holding unit 100B in the mobile communication terminal 100 receives the transmission power of the data signal (n) as the latest transmission power information. The reception power of the delivery confirmation signal (n-1) is held as the latest reception power information.

When the communication in the operation example of FIG. 4 fails, as shown in FIG. 7B, the latest transmission / reception power information holding unit 110B in the mobile communication terminal 110 transmits a delivery confirmation signal (m) as the latest transmission power information. The received power of the data signal (m) is held as the power and the latest received power information.
FIG. 8 is a flowchart for explaining a series of operations of the communication quality improvement system by specifying the cause of communication failure. As shown in this figure, it is assumed that there is a communication failure shown in FIG.

In step 602, the communication state is waited for.
In step 603, the mobile communication terminal 100 (110) that has recovered the communication state makes an inquiry to the radio management station 300 (310).
In step 604, in response to the inquiry, the radio communication station 300 (310) notifies the mobile communication terminal 100 (110) of the latest transmission signal and latest reception signal of the latest transmission / reception signal holding unit 300A (310A).

For example, as shown in FIG. 6A, the mobile communication terminal 100 stores the delivery confirmation signal (n) as the latest transmission signal and the data signal (n) as the latest reception signal held in the latest transmission / reception signal holding unit 300A. Will be notified.
Furthermore, as shown in FIG. 6B, the data signal (m) held as the latest transmission signal and the delivery confirmation signal (m−1) held as the latest reception signal are held in the latest transmission / reception signal holding unit 310A. The terminal 100 is notified.

In step 605, the communication failure factor determination unit 100D (110D) of the mobile communication terminal 100 (110) performs the latest transmission held in the latest transmission / reception signal holding unit 300A (310A) and the latest transmission / reception signal holding unit 100C (110C). Analyzes the cause of communication failure based on the signal and the latest received signal.
For example, in the communication failure factor determination unit 100D, a delivery confirmation signal (n) as the latest transmission signal held in the latest transmission / reception signal holding unit 300A, a data signal (n) as the latest reception signal, and the latest transmission / reception signal holding unit 100C. When the data signal (n) is analyzed as the latest transmission signal held by the mobile terminal and the delivery confirmation signal (n-1) is analyzed as the latest reception signal, the data signal (n) transmitted from the mobile communication terminal 100 is It can be seen that the delivery confirmation signal (n) transmitted by the radio management station 300 has not reached the mobile communication terminal 100. That is, it can be understood that the transmission failure factor to the radio management station 300 is the transmission failure of the base station 200.

  Further, the communication failure factor determination unit 110D holds the data signal (m) as the latest transmission signal held in the latest transmission / reception signal holding unit 310A, the transmission confirmation signal (m-1) as the latest reception signal, and the latest transmission / reception signal holding. When the transmission confirmation signal (m) is analyzed as the latest transmission signal held in the unit 110C and the data signal (m) is analyzed as the latest reception signal, the transmission confirmation signal of the data signal (m) transmitted by the mobile communication terminal 110 is analyzed. Since the data signal (m + 1) was not received from the radio management station 310 at the time of transmitting (m), it can be understood that the transmission failure factor to the radio management station 310 was the transmission failure of the mobile communication terminal 110.

In step 606, the mobile communication terminal 100 (110) notifies the radio management station 300 (310) of the communication failure cause, the received power at the time of communication failure, and the transmission power information, and holds them in the communication failure information holding unit 300 B (310 B). To do.
In step 607, the transmission power increase request unit 300C (310C) analyzes the communication failure factor, the received power at the time of communication failure, and the transmission power information of the communication failure information holding unit 300B (310B), and the mobile communication terminal 100 ( 110) reception power is low and there are many transmission failures from the base station 200 (210), or transmission power on the mobile communication terminal 100 (110) side is generally low and transmission from the mobile communication terminal 100 (110) It is determined whether there are many failures, and in response to this determination, the base station 200 (210) and the mobile communication terminal 100 (110) are requested to increase transmission power, and the process is terminated.

The transmission power increase request unit 300C (310C) of the radio management station 300 (310) will be described in detail below.
FIG. 9 is a block diagram for explaining a part of the communication system of the mobile communication terminal of FIG. As shown in the figure, the radio management station 300 (310) includes a plurality of base stations 200-1 (210-1), 200-2 (210-2), 200-3 (210) as the base station 200 (210). -3) is connected and the area of the base station zone of the base station 200-1 (210-1) as the mobile communication terminal 100 (110) located in the area of the base station zone of the base station 200 (210-1) Mobile communication terminals 101-1 (111-1), 101-2 (111-2), 101-3 (111-3), and 101-4 (111-4) that are located in the base station 200 fail to communicate. -2 (210-2), the mobile communication terminals 102-1 (112-1) and 102-2 (112-2) located in the area of the base station zone fail to communicate, and the base station 200-3 (210- 3) Mobile stations located in the base station zone area Terminal 103-1 (113-1), 103-2 (113-2), and 103-3 (113-3) is communicating failure.

  FIG. 10 is a diagram for explaining the communication failure information holding unit 300B (310B) and the transmission power increase request unit 300C (310C) of the radio management station 300 (310) of FIG. As shown in this figure, the communication failure information holding unit 300B (310B) of the radio management station 300 (310) includes a communication failure factor and communication of the mobile communication terminal 100 (110) located in each base station 200 (210). Transmission power and reception power at the time of failure are retained.

The mobile communication terminals 101-1 to 101-4 located in the base station 200-1 are assumed to have failed transmission on the mobile communication terminal side.
The mobile communication terminals 102-1 and 102-2 located in the base station 200-2 are assumed to have failed to transmit on the base station side.
Assume that the mobile communication terminal 103-1 located in the base station 200-3 has failed in transmission on the base station side, and the mobile communication terminal 101-4 has failed in transmission on the mobile communication terminal side.
Let's say.

The sum, average, and average of received power of all mobile communication terminals located in each base station 200-1, 200-2, and 200-3 are held.
It is assumed that mobile communication terminal 100 (110) in which no communication failure has occurred transmits and receives with the average value of each base station for both transmission power and reception power.
The transmission power increase request unit 300C (310C) is provided with a restriction on the total transmission power of the mobile communication terminal and a restriction on the average reception power.

The restriction on the sum of the transmission power of mobile communication terminals is limited to base stations 200-1 (210-1), 200-2 (210-2), 200- in order to suppress interference with radio resources and other base stations. 3 (210-3) has an upper limit of mobile communication terminals that can be in the area, and the total transmission power of each mobile communication terminal in the area does not exceed 50 dBm as a limit value.
Further, the average received power is limited so that transmission from the base station side also interferes with other base stations, so that the limit value does not exceed, for example, −80 dBm.

First, in the transmission power increase request unit 300C, the communication failure of the mobile communication terminals 101-1 to 101-4 in the base station 200-1 is a mobile communication terminal side transmission failure with reference to the communication failure information holding unit 300B. The information on the transmission power at the time of communication failure is analyzed as follows.
50 dBm (limit value of total transmission power) −40 dBm (total transmission power of base station 200-1) = 10 dBm

As a result, the total transmission power related to the base station 200-1 has a margin of 10 dBm up to the limit value. Therefore, it is possible to increase the transmission power by allocating to each of the mobile communication terminals 101-1 to 101-4 by 10 dBm / 4 (the number of mobile communication terminals having failed communication) = 2.5 dBm.
Therefore, the transmission power increase request unit 300C uses the existing notification information to request the mobile communication terminals 101-1 to 101-4 to increase the transmission power by 2.5 dBm. Thereby, communication quality can be improved.

Further, the transmission power increase request unit 300C refers to the communication failure information holding unit 300B, and the communication failure of the mobile communication terminals 102-1 and 102-2 in the base station 200-2 is a base station side transmission failure. The received power information at the time of failure is analyzed as follows.
−80 dBm (average received power is a limit value) − (− 90 dBm (average received power of base station 200-1)) = 10 dBm

As a result, the average received power related to the base station 200-1 has a margin of 10 dBm up to the limit value. For this reason, it is possible to increase the transmission power of the base station 200-1 by 10 dBm.
Therefore, the transmission power increase request unit 300C requests the base station 200-1 to increase the transmission power by 10 dBm using the existing notification information. Thereby, communication quality can be improved.

Further, in the transmission power increase request unit 300C, the communication failure information holding unit 300B is referred to, the communication failure of the mobile communication terminal 103-1 in the base station 200-2 is a base station side transmission failure, and the mobile communication terminal 103- Since the communication failure of Nos. 2 and 103-3 is on the mobile communication terminal side, information on transmission power and reception power at the time of communication failure is analyzed as follows.
50 dBm (limit value of total transmission power) −50 dBm (total transmission power of base station 200-3) = 0 dBm

As a result, the total transmission power related to the base station 200-3 has no room for the limit value. For this reason, each of the mobile communication terminals 103-2 and 103-3 cannot increase the transmission power. It is impossible to improve communication quality against a failure on the mobile communication terminal side.
On the other hand
−80 dBm (average received power is a limit value) − (− 85 dBm (average received power of base station 200-3)) = 5 dBm

As a result, the average received power related to the base station 200-3 has a margin of 5 dBm up to the limit value. For this reason, it is possible to increase the transmission power of the base station 200-3 by 5 dBm.
Therefore, the transmission power increase request unit 300C uses the existing notification information to request the base station 200-3 to increase the transmission power by 5 dBm. Thereby, communication quality can be improved.

  As described above, according to the present invention, an accurate communication failure factor can be specified in order to determine a communication failure factor based on the latest transmission signal and the latest reception signal of the mobile communication terminal when communication fails. It becomes possible. Furthermore, since an accurate cause of communication failure is clarified, it is possible to request the mobile communication terminal and the base station to increase transmission power, and it is possible to improve communication quality.

  In the above description, the mobile communication terminal has been described. However, the present invention is not limited to this, and the present invention can also be used for a mobile phone, a PHS (simple mobile phone), and a PDA (mobile information terminal).

It is a block diagram which shows schematic structure of the communication system of the mobile communication terminal which concerns on the communication quality improvement system by communication failure factor specification of this invention. It is a block diagram explaining the schematic function of the mobile communication terminal 100 (110) in FIG. It is a block diagram explaining the schematic function of the radio management station 300 (310) in FIG. It is a sequence diagram explaining the operation example of the communication system of the mobile communication terminal in FIG. It is a figure explaining the newest transmission signal held | maintained in the newest transmission / reception signal holding | maintenance part 100C in the mobile communication terminal 100 at the time of communication failure, and the newest transmission / reception signal holding | maintenance part 110C in the mobile communication terminal 110. 6 is a diagram for explaining the latest transmission signal and the latest reception signal held in the latest transmission / reception signal holding unit 300A in the radio management station 300 and the latest transmission / reception signal holding unit 310A in the radio management station 310 when communication fails. FIG. It is a figure explaining the latest transmission power information holding | maintenance part 100B in the mobile communication terminal 100 in the case of communication failure, the latest transmission power held | maintained in the latest transmission / reception power information holding part 110B in the mobile communication terminal 110, and the latest reception power. It is a flowchart explaining a series of operation | movement of the communication quality improvement system by communication failure factor specification. It is a block diagram explaining the partial detail of the communication system of the mobile communication terminal of FIG. It is a figure explaining the communication failure information holding | maintenance part 300B (310B) and the transmission power increase request | requirement part 300C (310C) of the wireless management station 300 (310) of FIG. It is a figure explaining the example of an occurrence event of communication failure in the radio section of a mobile communication terminal.

Explanation of symbols

100, 110, 101-1 to 101-4, 102-1, 102-2, 103-1 to 103-3 ... Mobile communication terminals 200, 210, 200-1, 200-2, 200-3, 210-1 210-2, 210-3 ... base stations 300, 310 ... radio management stations 100A, 110A ... transmission / reception power measuring units 100B, 110B ... latest transmission / reception power information holding units 100C, 110C ... latest transmission / reception signal holding units 100D, 110D ... communication Failure factor determination unit 300A, 310A ... Latest transmission / reception signal holding unit 300B, 310B ... Communication failure information holding unit 300C, 310C ... Transmission power increase request unit 400 ... Network

Claims (7)

In a communication quality improvement system by identifying communication failure factors of mobile communication terminals located in each area of a plurality of base stations managed by each wireless management station, where the wireless management stations are connected to each other,
A transmission power of a transmission signal transmitted by the mobile communication terminal, a transmission / reception power measurement unit for measuring a reception power of a received reception signal, and
Latest transmission / reception power information holding unit for holding transmission power and reception power measured by the transmission / reception power measurement unit for the latest transmission / reception signal;
A latest transmission signal transmitted and received by the mobile communication terminal, a first latest transmission / reception signal holding unit for holding the latest reception signal;
In the radio management station, a latest transmission signal transmitted / received from a mobile communication terminal residing in a base station having jurisdiction, a second latest transmission / reception signal holding unit holding the latest reception signal,
The mobile communication terminal that has failed in communication is notified of the latest transmission signal and the latest reception signal of the radio management station held in the second latest transmission / reception signal holding unit, and the latest in the radio management station Transmission signal, latest reception signal and latest transmission signal in the mobile communication terminal held in the first latest transmission / reception signal holding unit, transmission failure from the base station as a communication failure factor based on the latest reception signal, Or, a communication failure factor determination unit that determines a transmission failure from the mobile communication terminal,
The communication failure information holding unit for holding the communication failure factor and the communication transmission power notified to the radio management station from the latest transmission / reception power information holding unit of each mobile communication terminal that has failed in communication. When,
Based on the communication failure factor and communication transmission power held in the communication failure information holding unit, the reception power of the plurality of mobile communication terminals is generally low, and when there are many communication failures from the radio management station, If the transmission power of a plurality of mobile communication terminals is generally low, and there are many transmission failures from the plurality of mobile communication terminals, increase the transmission power to a plurality of mobile communication terminals. A communication quality improvement system by specifying a communication failure factor, comprising: a requesting transmission power increase request unit. The communication failure factor determination unit determines that the mobile communication terminal has failed to transmit when the transmission signal is transmitted from the mobile communication terminal to the radio management station and cannot be received by the radio management station. If the mobile communication terminal cannot receive the transmission signal, the base station determines that the transmission of the base station has failed. Further, if the transmission signal is transmitted from the radio management station to the mobile communication terminal, the mobile communication terminal cannot receive the transmission signal. The communication quality according to claim 1, wherein it is determined that the mobile communication terminal has failed to transmit if the radio control station cannot receive the transmission confirmation signal and the transmission confirmation signal is not received. Improvement system. The transmission power increase request unit sets a limit value for the sum of transmission powers of a plurality of mobile communication terminals located in each base station, and further receives power of a plurality of mobile communication terminals located in each base station. If the sum of the transmission powers of a plurality of mobile communication terminals located in each base station has a margin with respect to the limit value, the mobile communication terminal that has failed in communication has a sufficient transmission power. If the average of the received power of a plurality of mobile communication terminals located in each base station has a margin with respect to the limit value, the transmission power of the base station is increased by the margin. The communication quality improvement system according to claim 1, wherein the communication failure factor is specified. In the communication quality improvement method by specifying the communication failure factor of the mobile communication terminal in the area of each of the plurality of base stations that are connected to each other, each wireless management station is connected,
Measuring the transmission power of the transmission signal transmitted by the mobile communication terminal and the reception power of the received reception signal;
A step of holding the transmission power and the reception power measured by the transmission / reception power measurement unit for the latest transmission / reception signal;
The latest transmission signal transmitted and received by the mobile communication terminal, the step of holding the latest reception signal,
In the radio management station, the latest transmission signal transmitted and received from the mobile communication terminal residing in the base station in charge, the step of holding the latest reception signal,
The mobile communication terminal that has failed in communication is notified of the latest transmission signal and the latest reception signal of the radio management station held, and is held as the latest transmission signal and the latest reception signal of the radio management station. The latest transmission signal in the mobile communication terminal, a process of determining a transmission failure from the base station as a communication failure factor based on the latest reception signal, or a transmission failure from the mobile communication terminal,
A communication failure factor notified to the radio management station from each mobile communication terminal that failed in communication, a step of holding communication transmission power for each base station;
Based on the communication failure factors and communication transmission power that are held, if the reception power of multiple mobile communication terminals is generally low and there are many communication failures from the radio management station, increase the transmission power to multiple base stations. Or a step of requesting the plurality of mobile communication terminals to increase the transmission power when the transmission power of the plurality of mobile communication terminals is low and there are many transmission failures from the plurality of mobile communication terminals. A method for improving communication quality by identifying a cause of communication failure. In a program in which the wireless management stations are connected to each other, and the communication quality improvement by identifying the communication failure factor of the mobile communication terminal located in each area of the plurality of base stations managed by each wireless management station is executed by a computer,
A procedure for measuring transmission power of a transmission signal transmitted by the mobile communication terminal and reception power of a received signal received;
A procedure for holding transmission power and reception power measured by the transmission / reception power measurement unit for the latest transmission / reception signal,
The latest transmission signal transmitted and received by the mobile communication terminal, a procedure for holding the latest reception signal,
In the radio management station, the latest transmission signal transmitted and received from the mobile communication terminal residing in the base station that has jurisdiction, a procedure for holding the latest reception signal,
The mobile communication terminal that has failed in communication is notified of the latest transmission signal and the latest reception signal of the radio management station held, and is held as the latest transmission signal and the latest reception signal of the radio management station. The latest transmission signal in the mobile communication terminal, a procedure for determining a transmission failure from the base station as a communication failure factor based on the latest reception signal, or a transmission failure from the mobile communication terminal,
A communication failure factor notified to the radio management station from each mobile communication terminal that failed to communicate, a procedure for holding communication transmission power for each base station,
Based on the communication failure factors and communication transmission power that are held, if the reception power of multiple mobile communication terminals is generally low and there are many communication failures from the radio management station, increase the transmission power to multiple base stations. Or a procedure for requesting the plurality of mobile communication terminals to increase the transmission power when the transmission power of the plurality of mobile communication terminals is low and there are many transmission failures from the plurality of mobile communication terminals. A program for executing communication quality improvement by specifying a cause of communication failure on a computer. In mobile communication terminals where radio management stations are connected to each other, located in each area of a plurality of base stations managed by each radio management station, and improving communication quality by specifying a communication failure factor,
A transmission / reception power measuring unit for measuring transmission power of a transmission signal transmitted by the mobile communication terminal, reception power of a received reception signal, and
Latest transmission / reception power information holding unit for holding transmission power and reception power measured by the transmission / reception power measurement unit for the latest transmission / reception signal;
A latest transmission signal transmitted and received by the mobile communication terminal, a first latest transmission / reception signal holding unit for holding the latest reception signal;
A second latest transmission / reception that holds the latest transmission signal and the latest reception signal transmitted / received from the mobile communication terminal located in the base station in charge at the radio management station to the mobile communication terminal that has failed in communication. The latest transmission data and the latest reception data of the radio management station held in the signal holding unit are notified, and the latest transmission data, the latest reception data and the first latest transmission / reception signal holding unit in the radio management station are notified. Communication failure factor determination unit that determines the transmission failure from the base station or the transmission failure from the mobile communication terminal as a communication failure factor based on the latest transmission data and the latest reception data held in the mobile communication terminal When,
The communication failure information holding unit for holding the communication failure factor and the communication transmission power notified to the radio management station from the latest transmission / reception power information holding unit of each mobile communication terminal that has failed in communication. Based on the cause of communication failure and communication transmission power held in the network, when the reception power of multiple mobile communication terminals is low and there are many communication failures from the radio management station, the transmission power increases for multiple base stations. Or when the transmission power of the plurality of mobile communication terminals is low and there are many transmission failures from the plurality of mobile communication terminals, the radio management station requests the radio management station to increase the transmission power. A mobile communication terminal that improves communication quality by specifying a cause of communication failure. In a radio management station where a mobile communication terminal has jurisdiction over a plurality of base stations located in the area of the base station and performs communication quality improvement by specifying a communication failure factor of the mobile communication terminal,
In the radio management station, a latest transmission signal transmitted / received from a mobile communication terminal residing in a base station having jurisdiction, a second latest transmission / reception signal holding unit holding the latest reception signal,
The mobile communication terminal that has failed in communication is notified of the latest transmission signal and the latest reception signal of the radio management station held in the second latest transmission / reception signal holding unit, and the latest in the radio management station The latest transmission signal at the mobile communication terminal held in the first latest transmission / reception signal holding unit holding the transmission signal, the latest reception signal, the latest transmission signal transmitted / received at the mobile communication terminal, and the latest reception signal A communication failure factor determination unit that determines a transmission failure from the base station or a transmission failure from the mobile communication terminal as a communication failure factor based on the latest received signal, and transmits the latest transmission / reception signal at the mobile communication terminal. The transmission power of the received transmission signal, the transmission power measured by the transmission / reception power measurement unit that measures the reception power of the received reception signal, and the latest transmission / reception power information holding unit that holds the received power are sent to the radio management station. Notified communication cause, a communication failure information storage unit storing communication transmission power for each base station,
Based on the communication failure factor and communication transmission power held in the communication failure information holding unit, the reception power of the plurality of mobile communication terminals is generally low, and when there are many communication failures from the radio management station, If the transmission power of a plurality of mobile communication terminals is generally low, and there are many transmission failures from the plurality of mobile communication terminals, increase the transmission power to a plurality of mobile communication terminals. A radio management station for improving communication quality by specifying a cause of communication failure, comprising: a requesting transmission power increase request unit.

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