JP5239749B2 - Communication quality management system, communication detection device, network management device, communication quality management method, and communication detection program - Google Patents

Description

  The present invention relates to a communication quality management system that manages a communication quality index for each mobile terminal in a communication area, and a communication detection device, a network management device, a communication quality management method, and a communication detection program applied to the communication quality management system. And a network management program.

  Wireless communication networks that connect mobile terminals such as portable terminals have been developed. For example, telecommunications carriers are required to monitor the communication quality of communication networks and the operating status of communication devices, and take prompt action in the event of a failure.

  FIG. 23 is a block diagram showing an example of the configuration of a mobile communication network related to the present invention. The mobile communication network shown in FIG. 23 includes mobile terminals 10 to 14, radio base stations 30 to 32, a radio base station control device 100a, and a network management device 200a.

  The radio base stations 30 to 32 are radio communication apparatuses that secure communication lines with the mobile terminals 10 to 14 by transmitting and receiving radio waves, for example. The mobile terminal 10 and the mobile terminal 11 are connected to the radio base station 30 via radio links 20 and 21. Similarly, the mobile terminal 12 is connected to the radio base station 31 via the radio link 22, and the mobile terminal 13 and the mobile terminal 14 are connected to the radio base station 32 via the radio links 23 and 24. In addition, wireless cells 80 to 82 are provided around the wireless base stations 30 to 32 as a range in which a wireless link with a mobile terminal is effective.

  The radio base station control device 100a is a device that controls the radio base stations 30 to 32. The radio base station control device 100a transmits and receives communication traffic and control traffic via the radio base stations 30 to 32 under control and the wired links 40a to 42a.

  The radio base station control device 100a is connected to the mobile communication core network 60a via a wired link 43a. The mobile communication core network 60a is a communication network including, for example, other exchanges and server devices.

  In such a communication network, an index relating to communication quality is obtained from a network-side communication apparatus such as the radio base station control apparatus 100a, and an abnormality in the operation status of the communication network is detected by comparing the index with a predetermined threshold. To do. For example, in the mobile communication network shown in FIG. 23, the network management device 200a is connected to the radio base station control device 100a and the exchange station or server device (not shown) in the mobile communication core network 60a via wired links 44a and 45a. Connected. The communication carrier refers to the communication quality index periodically acquired from the network side communication device by the network management device 200a, and monitors the failure of the communication device and the quality deterioration of the communication service.

  Non-Patent Document 1 describes an example of a communication quality index for a communication network. Non-Patent Document 1 defines communication quality information to be periodically acquired for each radio cell in a radio base station control device of a mobile communication network based on the specifications of 3GPP (3rd Generation Partnership Program). For example, as the information on the communication quality, the number of establishment attempts of radio access bearers per unit time, the number of establishment failures, the number of abnormal releases, and the like are defined. From these pieces of information, communication quality indicators such as the probability of establishment failure of radio access bearers and the probability of abnormal release are calculated. If these indicators are larger than a predetermined threshold, it is determined that there is an abnormality.

  When dealing with the communication quality abnormality detected in this way, a significant deterioration in quality is caused to a wide range of terminals in the communication area, such as a failure of a device in the communication network (sometimes referred to as a network side device). It is important to deal quickly with priority from the fatal ones. For this purpose, it is necessary to quickly evaluate the scale of the number of terminals that suffer quality degradation with respect to the detected communication quality abnormality.

  As a first technique for evaluating the scale of the number of terminals that suffer quality degradation, there is a method of analyzing a failure notification message. The failure notification message is a message for notifying a device failure. For example, in the mobile communication network shown in FIG. 23, when a failure occurs between communication devices facing each other such as the radio base station control device 100a and the radio base station 30, the radio base station control device 100a or the radio base station 30 transmits a failure notification message to the network management apparatus 200a.

  In this method, the cause is estimated for the detected abnormality, and when the estimated cause indicates a device failure on the network side, it is evaluated that a wide range of terminals under the device suffers quality degradation. On the other hand, in other cases, it is evaluated that quality degradation is limited to some terminals.

  Japanese Patent Application Laid-Open No. 2004-228561 describes a failure countermeasure method for specifying a failure factor when a failure occurs as a method for specifying the cause of the detected abnormality. In the failure countermeasure method described in Patent Document 1, individual operation scenarios such as traffic information collection, diagnosis / test, and device switching are prepared in advance. The factor identification / fault countermeasure section identifies the cause of the failure by automatically identifying the influence by collecting traffic information and identifying the factor by diagnosis / test according to the operation scenario.

  Further, as a second technique for evaluating the scale of the number of terminals that suffer quality degradation, there is a method of analyzing a communication quality index (quality index). In this method, the degree of abnormality (abnormality) is calculated for the quality index observed in communication area units, and if the quality index is high, a fatal event such as a network-side device failure has occurred. Therefore, it is evaluated that a wide range of terminals under the communication area suffer from quality degradation. On the other hand, when the degree of anomaly of the quality index is low, it is considered that the failure is caused by a specific mobile terminal or a call due to local insensitivity of radio waves, etc. Evaluate to be limited to terminals.

Patent Document 2 describes an abnormality detection system that calculates the degree of abnormality of a quality index . The abnormality detecting system according to Patent Document 2, for example, leave modeled in advance the communication quality of the communication area of the normal statistical distribution of the quality index value, in accordance with the number of trials of the communication, for the quality model The degree of abnormality is calculated based on the degree of statistical deviation.

  As a third technique for evaluating the scale of the number of terminals that suffer quality degradation, there is a method of analyzing a process log inside a communication device. Patent Document 3 describes an example of a process log inside a communication device. The process log described in Patent Document 3 is called a call processing alarm log, and the processing location or abnormal disconnection in which an abnormal disconnection occurs in response to an abnormal disconnection of a communication event that occurred in the middle of the call processing in the communication device. It contains information such as the reason for the occurrence. For example, in the mobile communication network shown in FIG. 23, the call processing alarm log is provided in the radio base station control apparatus 100a and the network management apparatus 200a as a time-series log accompanied by information such as the date and time of occurrence and a communication node related to abnormal disconnection. Accumulated in the recording device.

  In the method of analyzing the process log inside the communication device, the terminal that suffers from the quality abnormality is identified from the information of the communication node related to the abnormal disconnection. Evaluate that a wide range of terminals under its control suffer quality degradation. On the other hand, for a communication area where the number of terminals that undergo abnormal disconnection is small, it is evaluated that quality degradation is limited to some terminals.

  The first to third techniques for evaluating the scale of the number of terminals that suffer quality degradation may be used alone or in combination. For example, when the cause specified by the first technique does not indicate a network-side device failure, the second technique is used to evaluate the scale of the number of terminals that suffer quality degradation from the degree of abnormality of the quality index. If a more detailed analysis is desired, a method based on the third technique is used in which a process log inside the communication apparatus is acquired and the scale of the number of terminals that suffer quality degradation is evaluated.

JP 2004-80297 A (paragraph 0032, FIGS. 4 and 5) JP 2006-340050 A (paragraphs 0012 to 0015, 0036 to 0038, FIG. 3) Japanese Patent Laid-Open No. 11-261471 (paragraphs 0011 to 0013, FIG. 1) 3GPP TS 32.410, "Telecommunication management; Key Performance Indicators (KPI) for UMTS and GSM (Release 8)", 2008.

  In the first technique, it is necessary to specify in advance from the failure notification message whether there is a device failure on the network side. However, when a failure occurs in the failure notification function itself, an appropriate failure notification message may not be output. For this reason, there is a problem in that even if a communication quality abnormality is detected, a failure notification message is not output, so that the scale of the number of terminals that suffer quality degradation may be underestimated.

  In the second technique, it is necessary to appropriately evaluate the degree of abnormality with respect to the quality index observed in communication area units. However, in a wireless cell with relatively little traffic, even if the quality indicator of the wireless cell shows a high degree of anomaly, in reality, some terminals simply failed to communicate near the dead zone In many cases, communication of most other terminals is normal. Therefore, in such a case, there is a problem of overestimating the scale of the number of terminals that are subject to quality degradation.

  These problems are caused by the third technique, that is, a method in which process logs in the communication device are collected in advance from the network side communication device to the network management device, and the number of terminals suffering from quality abnormalities is totaled on the network management device side. There are cases where it can be solved. However, since the process log contains detailed information on abnormally disconnected communication events, the amount of data is enormous. Furthermore, in mobile communication networks that provide communication services over a wide area, the communication area managed by the network management device There are many. Therefore, it generally takes a lot of time to collect process logs from the network side device to the network management device.

  In addition, when the number of terminals that suffer from quality abnormalities is counted for each communication area, a huge amount of storage capacity is required for network management devices. Will increase. As described above, since the third technique requires a lot of resources and time for data collection and aggregation, there is a problem that it is difficult to quickly evaluate the scale of the number of terminals that suffer quality degradation using this technique. .

  These problems become particularly apparent when a network-side device failure occurs in a wireless cell with relatively little traffic, and at the same time, the failure notification function fails and an appropriate failure notification message is not output. In this case, even if a communication quality abnormality is detected, it can be distinguished from quality deterioration due to local dead areas of radio waves or terminal failures, as in the problems of the first and second technologies. There is a problem that it is difficult to appropriately determine the cause of the detected abnormality.

  Furthermore, when the third technique is used, a long time is required for detailed analysis. For this reason, it takes a lot of time to determine the local quality degradation that occurs frequently, and there is a problem that the response to a fatal failure that requires quick action such as network equipment failure is delayed. .

  Therefore, the present invention provides a communication quality management system capable of accurately evaluating the scale of the number of terminals suffering quality degradation and estimating the cause of the quality degradation while suppressing a necessary storage capacity, and the communication quality management system thereof An object of the present invention is to provide a communication detection device, a network management device, a communication quality management method, a communication detection program, and a network management program that are applied to the network.

A communication quality management system according to the present invention is connected to a mobile communication network and detects a communication in a communication area, and a communication detection device connected to the mobile communication network and detected by the communication detection device. And a network management device for analyzing the quality of communication, and the communication detection device performs the number of communication attempts performed by the mobile terminal in the communication area in a predetermined period, the number of communication failures, and the movement that has failed in communication. Communication information storage means for storing period communication information including the number of failed terminals indicating the total number of terminals, and terminal failure information including information related to communication failure for each mobile terminal, communication attempts and communication in the communication area A detecting means for detecting failure, and when the detecting means detects a communication attempt and a communication failure, the period communication information is totaled based on the number of communication attempts and the number of communication failures, and is stored in the communication information storage means. Communication information to register When the registration unit and the detection unit detect a communication failure, a management target terminal specifying unit that specifies a mobile terminal that has failed in communication as a management target terminal for which communication quality is to be calculated, and a management target terminal specifying unit The terminal management information registration means for totaling terminal failure information for each management target terminal specified by the network and registering it in the communication information storage means is provided, and the network management device is based on the period communication information stored in the communication information storage means. A terminal failure rate calculating means for calculating a terminal failure rate indicating a ratio of the number of terminals that have failed in communication with respect to the number of mobile terminals that have performed communication, terminal failure information stored in the communication information storage means, and a terminal failure rate. to the original, and the deterioration scale evaluation means for evaluating the number of terminals of scale that suffer the quality deterioration, on the basis of the scale of the number of terminals, and a deterioration cause estimation means for estimating the cause of quality deterioration, the deterioration scale evaluation means , Terminal When the loss rate is equal to or higher than a predetermined threshold, the number of terminals that are subject to quality degradation is judged to be large, and the cause-of-degradation estimation means has judged that the number of terminals that are subject to quality degradation is large. Sometimes, it is estimated that a failure of a network side device that relays communication between a mobile terminal and a communication detection device or a relay line that relays communication is a cause of quality degradation .

A communication detection apparatus according to the present invention is a communication detection apparatus connected to a mobile communication network, and the number of communication attempts performed by a mobile terminal in a communication area during a predetermined period, the number of communication failures, and communication. Communication information storage means for storing period communication information including the number of failed terminals indicating the total number of failed mobile terminals, terminal failure information including information regarding communication failure for each mobile terminal, and communication attempt within the communication area And detecting means for detecting a communication failure, and when the detecting means detects a communication attempt and a communication failure, the communication information is totaled based on the number of communication attempts and the number of communication failures. Communication information registration means for registering in the storage means, and when the detection means detects a communication failure, a management target terminal specifying means for specifying a mobile terminal that has failed in communication as a management target terminal for calculating communication quality When Aggregates the terminal failure information for each managed terminal managed terminal identifying unit has identified, with terminal summary information registration means for registering in the communication information storage unit, the communication information storage means is connected to the mobile communication network Communication between a mobile terminal and a communication detection device when a terminal failure rate indicating a ratio of the number of terminals that have failed in communication to the number of mobile terminals that have performed communication within a communication area is equal to or greater than a predetermined threshold It is referred to by a network management apparatus that estimates that a failure of a network side apparatus that relays or a relay line that relays communication is a cause of quality degradation .

A network management apparatus according to the present invention is connected to a mobile communication network, and the number of communication attempts performed by a mobile terminal in a communication area during a predetermined period, the number of communication failures, and the total number of mobile terminals that have failed in communication. The period communication information including the number of failed terminals shown, and the terminal failure information obtained by aggregating information related to the communication failure for each management target terminal specified as the communication quality calculation target among the mobile terminals that failed to communicate. A network management device that receives period communication information and terminal failure information from a communication detection device, and that has failed to communicate with the number of mobile terminals that have performed communication based on the period communication information stored in the communication detection device A terminal failure rate calculating means for calculating a terminal failure rate indicating the ratio of the number, a degradation scale evaluating means for evaluating the scale of the number of terminals suffering quality degradation based on the terminal failure information and the terminal failure rate, and the number of terminals Scale of Based, and a deterioration cause estimation means for estimating a cause of quality deterioration, the deterioration scale evaluating means, the size of the number of terminals suffer quality degradation when the terminal failure rate is not smaller than a predetermined threshold value is determined as large The degradation cause estimation means determines that the degradation scale evaluation means determines that the number of terminals suffering quality degradation is large, and the network side apparatus that relays communication between the mobile terminal and the communication detection apparatus or relay that relays communication. It is characterized in that a line failure is estimated as a cause of quality degradation .

A communication quality management method according to the present invention includes a detection step for detecting a communication attempt and a communication failure in a communication area, and a mobile terminal that has failed in communication when a communication failure is detected in the detection step. The management target terminal specifying step specified as the management target terminal to be calculated, and terminal failure information including information on communication failure for each management target terminal specified in the management target terminal specifying step are aggregated and stored in the communication information storage means When the terminal aggregation information registration step to be registered and the detection step detect a communication attempt and a communication failure, the mobile terminals in the communication area are in a predetermined period based on the number of communication attempts and the number of communication failures. The communication information is stored by summing up communication information for a period including the number of communication attempts performed, the number of communication failures, and the number of failed terminals indicating the total number of mobile terminals that failed to communicate. A terminal for calculating a terminal failure rate indicating the ratio of the number of terminals that have failed to communicate with the number of mobile terminals that have performed communication based on the communication information registration step registered in the communication information and the period communication information stored in the communication information storage means A failure rate calculating step, a terminal failure information stored in the communication information storage means, and a degradation scale evaluation step for evaluating the scale of the number of terminals that suffer quality degradation based on the terminal failure rate, and a scale of the number of terminals DOO, the saw including a deterioration cause estimation step of estimating a cause of quality degradation, in the deterioration scale evaluation step, the size of the number of terminals terminal failure rate suffer quality degradation in the case of more than the predetermined threshold value is determined as large The network side device or the communication that relays the communication between the mobile terminal and the communication detection device that detects the communication in the communication area when the number of terminals that are subject to the quality deterioration is determined to be large in the deterioration cause estimation step. In Failure of trunk line and estimates the cause of quality degradation.

A communication detection method according to the present invention includes a detection step for detecting communication attempts and communication failures in a communication area, and calculating a communication quality for a mobile terminal that has failed in communication when a communication failure is detected in the detection step. A mobile terminal in the communication area by collecting terminal failure information including information on communication failure for each management target terminal specified in the management target terminal specifying step, and a management target terminal specifying step that is specified as a target management target terminal Period communication information including the number of communication attempts performed in a predetermined period, the number of communication failures, and the number of failed terminals indicating the total number of mobile terminals that failed communication, and communication failures for each mobile terminal the terminal compiled information registration step of registering the communication information storage means for storing a terminal failure information including information, and detects a failure of the communication attempt and communication in the detection step In addition, based on the number of communication attempts and the number of communication failures, the number of communication attempts performed by the mobile terminals in the communication area in a predetermined period, the number of communication failures, and the total number of mobile terminals that failed to communicate It aggregates the period communication information including the number of failures terminal shown, seen including a communication information registration step of registering the communication information storage unit, the communication information storage unit, communication to the number of mobile terminals performing the communication in the communication area Network side device that relays communication between a mobile terminal and a communication detection device that detects communication within the communication area or relay that relays communication when the terminal failure rate indicating the ratio of the number of terminals that failed It is referred to when a line failure is estimated as a cause of quality degradation .

The network management method according to the present invention includes a period including the number of communication attempts performed by mobile terminals in a communication area in a predetermined period, the number of communication failures, and the number of failed terminals indicating the total number of mobile terminals that have failed in communication. Based on the communication information, a terminal failure rate calculating step for calculating a terminal failure rate that indicates a ratio of the number of terminals that have failed to communicate with the number of mobile terminals that have performed communication; A degradation scale evaluation step for assessing the scale of the number of terminals that suffer quality degradation based on the terminal failure information and the terminal failure rate obtained by summarizing communication failure information for each management target terminal specified as a calculation target, based on the number of scale, seen including a deterioration cause estimation step of estimating a cause of quality degradation, in the deterioration scale evaluation step, the number of terminals of the scale device failure rate suffer quality degradation in the case of more than a predetermined threshold value Large scale A network-side device that relays communication between a mobile terminal and a communication detection device that detects communication in the communication area when the number of terminals that are subject to quality deterioration is determined to be large in the deterioration cause estimation step Alternatively, it is presumed that a failure of a relay line that relays communication is estimated as a cause of quality degradation .

A communication detection program according to the present invention is a communication detection program installed in a computer connected to a mobile communication network, and detects a communication attempt in a communication area and a communication failure in the computer. Thus, when a communication failure is detected, a managed terminal identification process for identifying a mobile terminal that has failed in communication as a managed terminal that is a communication quality calculation target, and a mobile terminal in the communication area performs during a predetermined period. Communication information for a period including the number of communication attempts, the number of communication failures, the number of failed terminals indicating the total number of mobile terminals that failed to communicate, and the terminal failure information including information related to communication failures for each mobile terminal. Terminal aggregation information registration processing for collecting and registering terminal failure information for each management target terminal identified in the management target terminal identification processing in the stored communication information storage means, and detection When detecting the failure of the communication attempt and communications management, the number of attempts and the number of unsuccessful communication of a communication by aggregating the period communication information based, to execute the communication information registration process for registering in the communication information storage unit The communication information storage means communicates with the mobile terminal in the communication area when the terminal failure rate indicating a ratio of the number of terminals that have failed in communication to the number of mobile terminals that have performed communication within the communication area is equal to or greater than a predetermined threshold. It is referred to when a failure of a network side device that relays communication with a communication detecting device to be detected or a failure of a relay line that relays communication is estimated to be the cause of quality degradation .

The network management program according to the present invention is connected to a mobile communication network, and the number of communication attempts performed by a mobile terminal in a communication area during a predetermined period, the number of communication failures, and the total number of mobile terminals that have failed in communication. The period communication information including the number of failed terminals shown, and the terminal failure information obtained by aggregating information related to the communication failure for each management target terminal specified as the communication quality calculation target among the mobile terminals that failed to communicate. A network management program installed in a computer that receives period communication information and terminal failure information from a communication detection device, and failed to communicate with the number of mobile terminals that communicated with the computer based on the period communication information. A degradation rule that evaluates the scale of the number of terminals that suffer quality degradation based on the terminal failure rate calculation process that calculates the terminal failure rate that indicates the ratio of the number of terminals, the terminal failure information, and the terminal failure rate. Evaluation process, and, based on the scale of the number of terminals, to execute the deterioration cause estimation process for estimating the cause of quality degradation, in the deterioration scale evaluation processing, the terminal failure rate suffer quality degradation in the case of more than a predetermined threshold value A network-side device that relays communication between a mobile terminal and a communication detection device when the size of the number of terminals is determined to be large and the size of the number of terminals suffering quality degradation is determined to be large in the degradation cause estimation process Alternatively, it is characterized in that a failure of a relay line that relays communication is estimated as a cause of quality degradation .

  According to the present invention, it is possible to accurately evaluate the scale of the number of terminals suffering quality degradation and estimate the cause of quality degradation while suppressing the necessary storage capacity.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, a case will be described in which a base station control device is provided between a mobile communication core network and a radio base station, and these mobile communication networks are managed by a network management device. It is not limited. For example, the mobile communication network in which the mobile communication core network and the radio base station directly transmit and receive control signals without the base station control device, and the function of the network management device are incorporated in the base station control device or the radio base station. It may be a mobile communication network.

  In the following description, a wireless cell managed by a mobile communication network based on a cellular system will be described as an example of a communication area, but the communication area is not limited to a wireless cell.

Embodiment 1. FIG.
FIG. 1 is a block diagram showing an embodiment of a communication quality management system according to the first embodiment of the present invention. The communication quality management system according to the present embodiment includes a radio base station control device 100 and a network management device 200. The radio base station control device 100 and the network management device 200 are connected via a wired link 44.

  The radio base station control device 100 includes call processing control means 101 and quality statistics management means 106.

  The call processing control means 101 is connected to a mobile communication core network (not shown) and a radio base station (not shown) via wired links 40 to 43, and these devices and mobile terminals (not shown). ) And a control signal to control communication (hereinafter referred to as call processing).

  The quality statistics management means 106 includes a communication event abnormality detection means 102, an observation terminal selection means 103, a quality statistics storage means 104, and a quality statistics aggregation means 105.

  The communication event abnormality detection means 102 determines whether or not the call processing controlled by the call processing control means 101 has been normally completed. When an abnormality in call processing such as abnormal disconnection is detected, the occurrence date and time, the communication that has terminated abnormally Collect information such as communication nodes related to events and abnormal call processing.

  The quality statistics storage means 104 is a storage device that temporarily stores quality statistics for the observation period. The quality statistics storage means 104 includes quality statistics of the communication area such as the number of trials and failures of communication events during the observation period, and movements included in groups individually managed by the observation terminal selection means 103 among the mobile terminals existing in the communication area. Stores quality statistics such as the number of terminal failures.

  The observation terminal selection means 103 manages a group of mobile terminals that individually manage quality statistics. These mobile terminals managed by the observation terminal selection means 103 can also be called managed terminals. When the communication event abnormality detection unit 102 detects a call processing abnormality, the observation terminal selection unit 103 determines whether or not to include in the group managed by the observation terminal selection unit 103, and the mobile terminal stored in the quality statistics storage unit 104 Update group content.

  The quality statistics totaling unit 105 totals quality statistics such as the number of communication event attempts and the number of failures for the communication area where the communication call has occurred, and registers it in the quality statistics storage unit 104. Further, when a call processing abnormality occurs, quality statistics such as the number of failures are aggregated and registered in the quality statistics storage means 104 by the observation terminal selection means 103 for the mobile terminals targeted for individual management.

  FIG. 2 is an explanatory diagram illustrating an example of a data configuration of the quality statistics storage unit 104 according to the first embodiment of this invention. The quality statistics storage means 104 includes the type of communication event to be managed by the quality statistics, the communication area, the observation period, the number of communication event attempts and the number of failures, and the observation period (this In the example, information such as the number of terminals that failed to communicate is stored on July 1, 2008, 0: 0 to 0:15.

  In the following description, an area in which the radio base station control device 100 communicates is referred to as a communication area X. Also, the number of communication event attempts in communication area X is the number of attempts Ax, the total number of communication failures in communication area X is the number of failures Fx, and the number of terminals that have failed to communicate in communication area X within a certain observation period is the failed terminal. The number is written as Ux.

  Furthermore, the quality statistics storage means 104 stores information such as the terminal identification number, the number of communication event failures, and the last update time of the number of failures for a predetermined number of mobile terminals. The predetermined number means the upper limit of mobile terminals that the radio base station control apparatus 100 selects as a target for calculating communication quality. Hereinafter, this predetermined number is referred to as an upper limit M. In addition, for each mobile terminal, the number of communication event failures is denoted as failure number fi (1 ≦ i ≦ M), and the last update time of the number of failures is denoted as final update time ti (1 ≦ i ≦ M). Note that the number of trials Ax, the number of failures Fx, the number of failed terminals Ux, and the number of failures fi all have 0 as initial values.

  The call processing control means 101, the quality statistics management means 106 (more specifically, the communication event abnormality detection means 102, the observation terminal selection means 103, and the quality statistics aggregation means 105) are, for example, radio base stations that operate according to a program This is realized by the CPU of the control device 100. For example, the program is stored in a storage unit (not shown) of the radio base station control apparatus 100, and the CPU reads the program, and according to the program, the call processing control unit 101 and the quality statistics management unit 106 (more specifically, communication The event abnormality detecting means 102, the observation terminal selecting means 103, and the quality statistics counting means 105) may be operated.

  The network management device 200 includes quality statistics acquisition means 201, quality statistics storage means 202, quality statistics analysis means 203, network management variable storage means 204, and display means 205.

  The quality statistics acquisition means 201 reads the quality statistics of the communication area from the quality statistics storage means 104 of the radio base station control apparatus 100 and stores the quality statistics in the quality statistics storage means 202.

  The quality statistics storage unit 202 is a storage device that stores quality statistics of the communication area over a long period of time. The quality statistics storage unit 202 stores the quality statistics read by the quality statistics acquisition unit 201 from the quality statistics storage unit 104 and the analysis result of the quality statistics analysis unit 203.

  The network management variable storage unit 204 is a storage device that stores a threshold value used when the quality statistical analysis unit 203 evaluates the scale of the number of terminals that are subject to quality degradation.

  The quality statistical analysis means 203 evaluates the scale of the number of terminals that suffer quality degradation in the communication area based on the quality statistics stored in the quality statistics storage means 202 and the threshold values stored in the network management variable storage means 204. Estimate the cause of quality degradation.

  FIG. 3 is an explanatory diagram showing an example of the configuration of the quality statistical analysis means 203 in the first embodiment. The quality statistical analysis unit 203 includes, for example, a terminal failure rate calculation unit 206, a degradation scale evaluation unit 207, and a degradation cause estimation unit 208. The configuration of the quality statistical analysis unit 203 is limited to the configuration illustrated in FIG. Not.

  The terminal failure rate calculation means 206 is based on the quality statistics stored in the quality statistics storage means 202, and the ratio of the number of terminals that failed to communicate with the number of terminals that communicated within the communication area within the observation period (hereinafter, Calculated as terminal failure rate.) The terminal failure rate is different from the quality index obtained by the ratio of the number of failed communications to the number of communications. The terminal failure rate calculation unit 206 registers the calculation result in the quality statistics storage unit 202.

  Based on the quality statistics stored in the quality statistics storage unit 202 and the threshold values stored in the network management variable storage unit 204, the degradation scale evaluation unit 207 determines the number of terminals that have suffered quality degradation in the communication area within the observation period. The scale is evaluated and the result is registered in the quality statistics storage unit 202.

  Based on the evaluation result stored in the quality statistics storage unit 202 by the degradation scale evaluation unit 207, the degradation cause estimation unit 208 estimates the cause of quality degradation that has occurred in the communication area within the observation period, and uses the result as the quality Register in the statistics storage means 202.

  FIG. 4 is an explanatory diagram illustrating an example of a data configuration of the quality statistics storage unit 202 according to the first embodiment of this invention. The quality statistics storage unit 202 performs communication event trial count Ax and failure count Fx for each communication area acquired from the quality statistics storage unit 104 for the type, communication area, and observation period of the communication event to be managed by the quality statistics. Information such as the number of failed terminals Ux that failed in communication during the observation period of the communication area is stored. Further, the quality statistics storage means 202 is a terminal failure rate, which is a quality index calculated by the quality statistics analysis means 203, an evaluation result of the number of terminals subjected to quality degradation (degradation scale), an estimation result of the cause of quality degradation, etc. The information is memorized. In the following description, the terminal failure rate in the communication area X is referred to as a terminal failure rate Qx.

  FIG. 5 is an explanatory diagram showing a data configuration of the network management variable storage unit 204 according to the first embodiment of this invention. The network management variable storage unit 204 stores a threshold value of the failure frequency Fx used in the evaluation of the degradation scale for each communication area (in this example, wireless cell X) and communication event type (here, “establishment of wireless control connection”). (Hereinafter, referred to as threshold value Tx1), a threshold value of the number of failed terminals Ux (hereinafter referred to as threshold value Tx2), a threshold value of terminal failure rate Qx (hereinafter referred to as threshold value Tx3), and the like are stored. The threshold value Tx1 is a lower limit value of the number of failures per terminal regarded as significant quality degradation, the threshold value Tx2 is a lower limit value of the number of failed terminals regarded as a large scale, and the threshold value Tx3 is a lower limit value of a terminal failure rate regarded as a large scale. Are set respectively.

  The display unit 205 is a display device that displays information such as the contents of quality statistics of various communication events and the size of the number of terminals that suffer quality degradation. For example, if the network management device 200 is provided with an input means (not shown), the quality statistics according to the communication area and observation period designated by the administrator of the network management device 200 via the input means. The analysis unit 203 may display information such as the contents of quality statistics of various communication events and the size of the number of terminals suffering quality degradation on the display unit 205.

  The quality statistics acquisition means 201, the quality statistics analysis means 203 (more specifically, the terminal failure rate calculation means 206, the degradation scale evaluation means 207, and the degradation cause estimation means 208) are, for example, network management devices that operate according to a program This is realized by 200 CPUs. For example, the program is stored in a storage unit (not shown) of the network management apparatus 200, and the CPU reads the program, and in accordance with the program, the quality statistics acquisition unit 201, the quality statistics analysis unit 203 (more specifically, terminal failure) The rate calculating means 206, the deterioration scale evaluating means 207, and the deterioration cause estimating means 208) may be operated.

  Next, the operation will be described. FIG. 6 is a flowchart showing an example of processing of the quality statistic management unit 106 in the first embodiment.

  First, whether or not the communication event abnormality detection means 102 has detected an abnormality for each communication event of the call processing performed between the mobile terminal located inside the communication area X to be managed and the network side device. Is determined (step S200). If no abnormality is detected (NO in step S200), the quality statistics management means 106 increments the count of the communication area trial count Ax recorded in the quality statistics storage means 104 once and ends (step S201). .

  On the other hand, when the communication event abnormality detecting means 102 detects an abnormality (YES in step S200), the observation terminal selecting means 103 is a mobile terminal related to the communication event that ended abnormally (hereinafter referred to as an abnormal terminal A in this example). Is specified (step S202). For example, the observation terminal selection unit 103 may identify the abnormal terminal A based on the terminal identification number given for each terminal. In the following description, a case where a terminal identification number is used to identify a terminal will be described.

  Thereafter, the observation terminal selection means 103 stores the information of the mobile terminals managed in the communication area X (hereinafter referred to as a terminal identification number list) and quality statistics in the observation period including the abnormality occurrence date and time, and the quality statistics storage means 104. Read from. The observation terminal selection means 103 determines whether or not the terminal identification number of the abnormal terminal A has been registered in the terminal identification number list (step S203).

  When the terminal identification number of the abnormal terminal A has already been registered in the terminal identification number list (YES in step S203), the quality statistics management unit 106 counts the number of failures corresponding to the terminal identification number recorded in the quality statistics storage unit 104. The count of fi is incremented once (step S204), and the last update time ti is updated to the date and time when the abnormality occurred (step S205). Further, the quality statistics management means 106 increases the count of the failure count Fx of the communication area X stored in the quality statistics storage means 104 by 1 (step S206), and also increases the count of the communication area trial count Ax by 1. The process ends (step S201).

  On the other hand, when the terminal identification number of the abnormal terminal A is not registered in the terminal identification number list (NO in step S203), the observation terminal selection unit 103 determines the total number of terminal identification numbers registered in the terminal identification number list, that is, the number of terminals. Is less than or equal to a predetermined upper limit M (step S207).

  If the total number of terminal identification numbers registered in the terminal identification number list is not more than the upper limit M (YES in step S207), the terminal identification number of the abnormal terminal A is newly registered in the terminal identification number list (step S208). The count of the number of failed terminals Ux in the communication area X recorded in the quality statistics storage unit 104 is increased by 1 (step S209). Thereafter, the processes in steps S204 to S206 and step S201 are executed, and the process ends.

  On the other hand, when the total number of terminal identification numbers registered in the terminal identification number list exceeds the upper limit M (NO in step S207), the quality statistics management unit 106 determines that the number of failures is a predetermined threshold (hereinafter, threshold F). The following terminal group is extracted from the terminal identification number list (step S210). The threshold value F may be stored in the network management variable storage unit 204, for example, and the quality statistics management unit 106 may extract a terminal group from the terminal identification number list with reference to the value. The quality statistics management means 106 excludes the terminal with the oldest last update time from the extracted terminal group from the terminal identification number list (step S211). Thereafter, the processing of step S208 to step S209, step S204 to step S206, and step S201 is executed in order, and the processing ends.

  Note that the number of unsuccessful terminals Ux is counted redundantly by re-registering the mobile terminals excluded from the list when a mobile terminal exceeding the upper limit M of the registered number of terminal identification numbers fails during the observation period. There is a possibility. However, in reality, if the failure continues, there are many users who give up communication on the way, and there is a high possibility that a terminal that has not been updated for a long time has moved to another wireless area. Therefore, for example, in the assumed observation period (5 minutes to 1 hour), the mobile terminal excluded from the list is re-registered in the list by setting the upper limit M of the number of registrations to a somewhat large value. The frequency can be kept low. That is, it is possible to avoid the problem that the number of failed terminals Ux is counted twice due to re-registration of the mobile terminal.

  FIG. 7 is a flowchart for explaining an example of processing of the network management apparatus 200 in the present embodiment. The quality statistics acquisition unit 201 receives the quality statistics of the communication area X from the quality statistics storage unit 104 of the radio base station control apparatus 100, and stores the quality statistics in the quality statistics storage unit 202 (step S300).

  Next, the terminal failure rate calculating unit 206 reads the quality statistical information of the observation period to be analyzed with respect to the communication area X from the quality statistical storage unit 202, and acquires the values of the number of trials Ax, the number of failures Fx, and the number of failed terminals Ux. (Step S301).

  Based on these acquired values, the terminal failure rate calculation means 206 follows the equation 1 shown below, and the ratio of the number of terminals that failed to communicate with the number of terminals that communicated within the communication area within the observation period, that is, A terminal failure rate Qx is calculated (step S302).

  It is assumed that the number of communication per terminal within the observation period is a maximum of one, and the number of terminals communicating in the communication area X within the observation period excluding the duplication of retry due to communication failure from the number of communication attempts. Was approximated to Ax- (Fx-Ux).

  Subsequently, the degradation scale evaluation unit 207 reads the threshold value Tx1, the threshold value Tx2, and the threshold value Tx3 related to the communication area X from the network management variable storage unit 204 (step S303), and based on the read values, the quality degradation is performed in the communication area X. The scale of the number of terminals suffered is evaluated (step S304).

  The deterioration cause estimating means 208 estimates the cause of quality deterioration based on the evaluation result of the deterioration scale evaluating means 207 regarding the scale of the number of terminals that suffer quality deterioration in the communication area X (step S305).

  The terminal failure rate calculating unit 206, the deterioration scale evaluating unit 207, and the deterioration cause estimating unit 208 store the calculated results in the quality statistics storage unit 202 (step S306). Moreover, the quality statistical analysis means 203 outputs each calculation result to the display means 205 (step S307).

  The process of step S304 executed by the deterioration scale evaluation unit 207 will be described in detail below. FIG. 8 is a flowchart for explaining an example of processing of the degradation scale evaluation unit 207 in the first embodiment.

  First, the degradation scale evaluation unit 207 reads the quality statistical information of the observation period to be evaluated with respect to the communication area X from the quality statistical storage unit 202, and the number of terminals registered in the list of terminal identification numbers (hereinafter, the number of terminals mx). (Step S400). Next, the degradation scale evaluation unit 207 determines whether or not the number of failed terminals Ux is larger than the number of terminals mx (step S401). When the number of unsuccessful terminals Ux is larger than the number of terminals mx (YES in step S401), the degradation scale evaluation means 207 is a terminal that is outside the registration range of the list of terminal identification numbers among the mobile terminals that have failed to communicate within the observation period. On the other hand, the average number of failures per terminal (hereinafter referred to as the average number of failures f0) is calculated according to Equation 2 shown below (step S402).

  Here, the degradation scale evaluation means 207 compares the average failure frequency f0 with the failure frequency threshold value Tx1, and if the average failure frequency f0 is smaller than the threshold value Tx1, the range of terminals registered in the terminal identification number list. Evaluate the scale of the number of terminals that suffer quality degradation. On the other hand, when the average failure frequency f0 is equal to or greater than the threshold value Tx1, the degradation scale evaluation unit 207 evaluates the scale of the number of terminals that suffer quality degradation including terminals outside the registration range.

  Specifically, the degradation scale evaluation unit 207 determines whether or not the average failure frequency f0 is smaller than the threshold Tx1 (step S403). When the average failure frequency f0 is smaller than the threshold value Tx1 (YES in step 403), the degradation scale evaluation unit 207 has the number of terminals with the failure number equal to or greater than the threshold value Tx1 among the registered terminals (hereinafter referred to as the terminal number mx ′). (Step S404), and the number of failed terminals (hereinafter referred to as the number of failed terminals Ux ′) when evaluating the degradation scale is set as the number of terminals mx ′ (step S405). On the other hand, when the average failure frequency f0 is equal to or greater than the threshold Tx1 (NO in step S403), the degradation scale evaluation unit 207 sets the number of failed terminals Ux ′ as the number of failed terminals Ux (step S406).

  Next, the degradation scale evaluation means 207 calculates a terminal failure rate (hereinafter referred to as a terminal failure rate Qx ′) when evaluating the degradation scale according to the following Expression 3 (step S407).

  The degradation scale evaluation unit 207 determines whether or not the calculated terminal failure rate Qx ′ is smaller than the terminal failure rate threshold Tx3 (step S408).

  If the terminal failure rate Qx ′ is smaller than the threshold Tx3 (YES in step S408), the degradation scale evaluation unit 207 determines that the number of terminals that suffer quality degradation is small (step S409), and the terminal failure rate Qx ′ is When it is determined that it is not smaller than the threshold value Tx3 (NO in step S408), the number of terminals that suffer quality degradation is determined to be large (step S410).

  On the other hand, when the number of failed terminals Ux is less than or equal to the number of terminals mx in step S401 (NO in step S401), the degradation scale evaluation unit 207 executes the processing from step S404 and ends.

  In the above description, the scale of the number of terminals that suffer quality degradation is evaluated using the terminal failure rate Qx ′. However, the degradation scale evaluation unit 207 compares the number of failed terminals Ux ′ with the threshold Tx2 of the number of failed terminals. However, it may be determined as “small” when smaller than the threshold Tx2, and as “large” in other cases.

  In the above description, the scales determined by the degradation scale evaluation means 207 are two types, “small” and “large”, but the scales are not limited to these two types.

In addition to the processing in step S406, the degradation scale evaluation unit 207 registers the difference in reliability (for example, the difference between the average failure frequency f0 and the threshold value Tx1) in the quality statistics storage unit 202 , and the quality statistics analysis unit 203 However, the registered information may be displayed on the display unit 205 together with the evaluation result. By these processes, the reliability of the result of evaluating the deterioration scale can be improved.

  Next, the process of step S305 executed by the deterioration cause estimation unit 208 will be described in detail below. FIG. 9 is a flowchart for explaining an example of processing of the deterioration cause estimating means 208 in the first embodiment.

  First, the degradation cause estimation unit 208 reads the quality statistics information of the observation period to be evaluated with respect to the communication area X from the quality statistics storage unit 202 and acquires the evaluation result of the degradation scale determined by the degradation scale evaluation unit 207 ( Step S500). Next, the deterioration cause estimating means 208 determines whether or not the evaluation result of the deterioration scale is “large scale” (step S501).

  For example, when the scale causing quality degradation is large, the network side device that relays communication between the mobile terminal and the radio base station control device 100 or the communication between the mobile terminal and the radio base station control device 100 is relayed The cause is presumed to be a failure of the trunk line. Therefore, when the evaluation result is “large-scale” (YES in step S501), the deterioration cause estimating means 208 estimates that the cause of quality deterioration is “caused by a failure of the network side device or the relay line” and ends ( Step S502). On the other hand, if the evaluation result is not “large-scale” (NO in step S501), the deterioration cause estimating means 208 estimates that the cause of the quality deterioration is “caused by a failure of a specific terminal or a local dead zone”. The process ends (step S503).

  In the above embodiment, the case where the deterioration cause estimating unit 208 estimates the cause of deterioration based on the two types of contents “small” and “large” determined by the deterioration scale evaluating unit 207 has been described. When the scale evaluation unit 207 determines the scale of other contents, the deterioration cause estimation unit 208 may estimate the cause of deterioration based on the determination contents.

  In the present embodiment, the case where the quality statistics acquisition unit 201 receives quality information for each terminal from the quality statistics storage unit 104 has been described as an example. In addition to this, the parameters necessary for the processing performed by the degradation scale evaluation unit 207 are calculated in advance by the quality statistics management unit 106, and the quality statistics acquisition unit 201 uses the parameters instead of the quality information for each terminal. May be received. Alternatively, the quality statistics management unit 106 may perform the analysis process performed by the quality statistics analysis unit 203 and the quality statistics acquisition unit 201 may receive the analysis result. By such a method, the time required for the network management apparatus 200 to collect data can be shortened.

  According to the present invention, when the call processing control unit 101 detects a communication failure, the management target terminal is selected based on the information stored in the quality statistics storage unit 104, and the number of failures for each management target terminal is selected. Fi is totaled and registered. That is, in the radio base station control apparatus 100, the failure frequency fi for each terminal is recorded only for the top M mobile terminals having a large number of communication failures in the communication area. Therefore, it is possible to reduce the necessary storage capacity and the time required for data transfer to the network management apparatus 200 as compared with the case of recording information of all terminals that fail to communicate in the communication area.

  Furthermore, according to the present invention, the terminal failure rate is calculated based on the information stored in the quality statistics storage unit 202, and the scale of the number of terminals suffering quality degradation is evaluated based on the terminal failure rate. . That is, the network management apparatus 200 calculates a communication failure rate per terminal based on the record for each terminal, and evaluates the scale of the number of terminals that suffer quality degradation. Therefore, compared with the method using the communication failure rate per communication attempt, particularly in an environment where there are terminals that repeatedly fail to communicate (that is, when the number of times of failure Fx ≠ the number of failed terminals Ux), It is possible to more accurately evaluate the scale of the number of terminals that suffer quality degradation.

  A method for evaluating the scale of the number of terminals that suffer quality degradation will be described in detail below. FIG. 10 is an explanatory diagram showing an example of the distribution of the number of communication failures for each terminal with respect to the communication area X. For example, in the case of the method using the communication failure rate per trial, it was impossible to distinguish the difference between the distribution 300 and the distribution 301 and evaluate the scale of the number of terminals that suffered quality degradation. However, according to the present invention, since the number of failed terminals Ux is known, it is possible to perform an evaluation in which the difference between the distribution 300 and the distribution 301 is distinguished.

  Furthermore, according to the present invention, the cause of quality degradation is estimated based on the scale of the terminal that suffers quality degradation. For this reason, even in a wireless cell with relatively little traffic, it is easy to distinguish whether the cause of quality degradation is due to a local dead zone of radio waves, a terminal failure, or a device failure on the network side. Can be estimated more accurately.

Embodiment 2. FIG.
Next, a communication quality management system according to the second embodiment of the present invention will be described. The second embodiment of the present invention evaluates the bias of the distribution of the number of failures for each terminal and estimates the cause in more detail when the scale of the terminal suffering quality degradation is determined as “small”. Thus, it is different from the first embodiment. Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As in the first embodiment, the communication quality management system according to the second embodiment of the present invention includes a radio base station control device 100 and a network management device 200 (see FIG. 1). FIG. 11 is an explanatory diagram showing an example of the configuration of the quality statistical analysis means 203 in the second embodiment of the present invention. The quality statistical analysis unit 203 according to the present embodiment includes a failure number distribution evaluation unit 209 in addition to the terminal failure rate calculation unit 206, the deterioration scale evaluation unit 207, and the deterioration cause estimation unit 208 shown in FIG. Thus, it is different from the first embodiment.

  The failure number distribution evaluation unit 209 evaluates the deviation of the failure number distribution for each terminal based on the failure frequency distribution for each terminal stored in the quality statistics storage unit 202, and stores the evaluation result in the quality statistics storage. The data is stored in the means 202.

  Quality statistics acquisition means 201 and quality statistics analysis means 203 (more specifically, terminal failure rate calculation means 206, deterioration scale evaluation means 207, deterioration cause estimation means 208, failure number distribution evaluation means 209) are, for example, It is realized by the CPU of the network management device 200 that operates according to the program. For example, the program is stored in a storage unit (not shown) of the network management apparatus 200, and the CPU reads the program, and in accordance with the program, the quality statistics acquisition unit 201, the quality statistics analysis unit 203 (more specifically, terminal failure) The rate calculation means 206, the deterioration scale evaluation means 207, the deterioration cause estimation means 208, and the failure number distribution evaluation means 209) may be operated.

  FIG. 12 is an explanatory diagram showing an example of the data configuration of the quality statistics storage unit 202 in the second embodiment of the present invention. The quality statistics storage unit 202 in the present embodiment is different from the first embodiment in that the evaluation result of the failure number distribution evaluation unit 209 is stored in addition to the contents shown in FIG.

  FIG. 13 is an explanatory diagram showing an example of the data configuration of the network management variable storage unit 204 according to the second embodiment of the present invention. In addition to the contents shown in FIG. 5, the network management variable storage unit 204 in this embodiment uses an evaluation point of the cumulative number of failures used in the evaluation by the failure number distribution evaluation unit 209 (hereinafter referred to as evaluation point Rx). And the threshold value of the degree of bias of the failure number distribution (hereinafter, referred to as threshold value Tx4) is stored, and is different from the first embodiment.

  Next, the operation will be described. FIG. 14 is a flowchart illustrating an example of processing of the network management device 200 according to the second embodiment. Until the quality statistics acquisition unit 201 receives the quality statistics of the communication area X from the quality statistics storage unit 104 until the degradation scale evaluation unit 207 evaluates the scale of the number of terminals that suffer quality degradation in the communication area X. This process is the same as steps S300 to S304 (see FIG. 7) in the first embodiment.

  When the degradation scale evaluation unit 207 evaluates the scale of the number of terminals that suffer quality degradation in the communication area X (step S304), the failure number distribution evaluation unit 209 receives the evaluation points Rx, Rx, for the communication area X from the network management variable storage unit 204. The threshold value Tx4 is read (step S308).

  The failure number distribution evaluation means 209 evaluates the degree of bias of the distribution of the number of failures for each terminal for terminals whose failure number is equal to or greater than the threshold Tx1 in the communication area X based on the read value (step S309). .

  The cause-of-degradation estimation means 208 is the degree of bias of the distribution for each terminal of the number of failures evaluated by the failure number distribution evaluation means 209 and the evaluation result of the deterioration scale evaluation means 207 regarding the scale of the number of terminals that suffer quality deterioration in the communication area X. Based on the above, the cause of quality deterioration is estimated (step S305 ′).

  The terminal failure rate calculation means 206, the deterioration scale evaluation means 207, the failure number distribution evaluation means 209, and the deterioration cause estimation means 208 store the calculated results in the quality statistics storage means 202 (step S306 '). The quality statistical analysis means 203 outputs each calculation result to the display means 205 (step S307 ').

  The process of step S309 executed by the failure number distribution evaluation unit 209 will be described in detail below. FIG. 15 is a flowchart for explaining an example of processing of the failure number distribution evaluation unit 209 in the second embodiment. The failure number distribution evaluation unit 209 calculates a failure rate cumulative ratio distribution based on the failure frequency distribution for each terminal stored in the quality statistics storage unit 202 (step S600).

  FIG. 16 is an explanatory diagram illustrating an example of a distribution of a cumulative ratio of the number of communication failures with respect to the number of terminals. As shown in FIG. 16, the distribution of the cumulative ratio of the number of failures is the maximum of the sum of the number of failures (the horizontal axis of the graph shown in FIG. 16) and the number of failures where the terminal for which the number of terminals is counted failed. This distribution shows the relationship between values. At this time, the maximum value of the sum of the number of failures is expressed as a ratio to the sum (accumulation) of the number of failures in the target range (hereinafter referred to as the sum (accumulation) F0 of the number of failures) (in the graph shown in FIG. 16). Vertical axis). That is, the relationship between the number of terminals N (1 ≦ N ≦ Ux ′) and the cumulative number of failures R (0 ≦ R ≦ 1) is given by Equation 4 below.

  Note that the number of failures fi for each terminal is already arranged in ascending order. Further, the total number (failure) F0 of the number of failures shown in the above equation 4 is divided into a case where the value of Ux ′ determined by the degradation scale evaluation unit 207 in step S304 is mx ′ and a case of Ux, It is calculated | required by Formula 5 shown below.

  Based on this relationship, the failure number distribution evaluation unit 209 calculates the minimum number of terminals (hereinafter referred to as the number of terminals Nx) in which the cumulative number R of failure numbers exceeds the evaluation point Rx (step S601).

  The failure number distribution evaluation unit 209 determines whether or not the ratio of the number of terminals Nx to the number of failed terminals Ux ′ (hereinafter referred to as the degree of bias of the failure number distribution) is smaller than the threshold Tx4 (step S602). It can be said that the smaller the failure degree distribution is, the smaller the failure number distribution is. Therefore, when the degree of bias of the failure number distribution is smaller than the threshold Tx4 (YES in step S602), the failure number distribution evaluation unit 209 determines that “the bias of the failure number distribution is small” (step S603). On the other hand, if the degree of bias of the failure number distribution is equal to or greater than the threshold Tx4, the failure number distribution evaluation unit 209 determines that “the bias of the failure number distribution is large” (step S604).

  When the number of failed terminals Ux ′ exceeds the upper limit M of the number of terminals stored in the quality statistics storage unit 104, the failure number distribution evaluation unit 209 determines the difference in reliability (for example, the maximum sum of the number of failures). The value statistics) may be registered in the quality statistics storage unit 202, and the quality statistics analysis unit 203 may display the registered information on the display unit 205 together with the evaluation result. By these processes, the reliability of the result of evaluating the deviation of the failure number distribution can be improved.

  Next, the process of step S305 'executed by the deterioration cause estimating means 208 will be described in detail below. FIG. 17 is a flowchart for explaining an example of processing of the deterioration cause estimating means 208 in the second embodiment. Processing until the deterioration cause estimation unit 208 determines whether or not it is “large-scale” based on the evaluation result read from the quality statistics storage unit 202, and when the evaluation result is determined to be “large-scale” The processing is the same as steps S500 to S501 in the first embodiment and YES to step S502 (see FIG. 9) in step S501.

  When it is determined that the evaluation result is not “large-scale” (NO in step S501), the deterioration cause estimation unit 208 is based on the evaluation result of the failure number distribution regarding the communication area X evaluated by the failure number distribution evaluation unit 209. (Step S504), it is determined whether or not the evaluation result is “the deviation of the failure number distribution is large” (Step S505).

  When the evaluation result is “the deviation of the failure number distribution is large” (YES in step S505), the failure number distribution evaluation unit 209 determines that the cause of the quality deterioration is “the failure of the specific terminal or the local dead zone of radio waves”. ”And the process is terminated (step S503 ′). On the other hand, when the evaluation result is not “the bias of the failure number distribution is large” (NO in step S505), the failure number distribution evaluation unit 209 determines that the cause of the quality degradation is “partial failure of the network side device or local radio wave insensitivity”. It is estimated that “the cause is the ground” and the process is terminated (step S506).

  In the above embodiment, the deterioration cause estimating means 208 has two types of contents “small” and “large” determined by the deterioration scale evaluating means 207, and the size of the bias evaluated by the failure number distribution evaluating means 209. In addition, the case of estimating the cause of deterioration has been described. In addition, the degradation scale evaluation unit 207 may determine a scale other than “small” and “large”, and the failure number distribution evaluation unit 209 may evaluate a bias other than large or small. . In this case, the deterioration cause estimation means 208 may estimate the deterioration cause based on the determination content or evaluation.

  According to the present invention, in addition to the configuration of the first embodiment described above, a bias in the distribution of the number of failures for each terminal is evaluated, and the cause is estimated in more detail. Therefore, in addition to the effects of the first embodiment, it is easy to distinguish between a terminal failure of a specific terminal and a partial failure of the network side device, and the cause can be estimated more accurately.

  A method for distinguishing between a terminal failure of a specific terminal and a partial failure of the network side device will be described in detail below. FIG. 18 is an explanatory diagram showing an example of the distribution of the number of communication failures for each terminal with respect to the communication area X. As shown in FIG. 18, when there are terminals with a large number of failures compared to other terminals, the distribution of failure numbers becomes more uneven. In this embodiment, since the difference between the distribution 302 and the distribution 303 can be distinguished, a terminal failure of a specific terminal and a partial failure of the network side device can be further distinguished.

Embodiment 3. FIG.
Next, a communication quality management system according to the third embodiment of the present invention will be described. The third embodiment of the present invention is different from the first embodiment or the second embodiment in that the upper limit M of the number of terminals recorded in the quality statistics storage unit 202 is dynamically changed according to the traffic in the communication area X. Different from the embodiment. Hereinafter, the same components as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 19 is a block diagram showing an embodiment of a communication quality management system according to the third embodiment of the present invention. The communication quality management system according to the present embodiment includes the radio base station control device 100 and the network management device 200, but the first is that the network management device 200 includes the observation terminal number determination means 210. Different from the second embodiment or the second embodiment. Other configurations are the same as those of the first embodiment or the second embodiment.

  The number-of-observation-terminal determining means 210 uses the quality statistics storage means based on the past observation period data related to the communication area X stored in the quality statistics storage means 202 and the data related to the communication area X stored in the network management variable storage means 204. In 202, an upper limit (hereinafter referred to as an upper limit Mx) of the number of terminals in the communication area X individually managed is determined.

  FIG. 20 is an explanatory diagram showing an example of the data configuration of the network management variable storage unit 204 in the third embodiment of the present invention. The network management variable storage unit 204 in the present embodiment is different from the second embodiment in that in addition to the contents shown in FIG. 13, the upper limit Mx of the number of terminals individually managed by the quality statistics storage unit 202 is stored. .

  Quality statistics acquisition means 201, quality statistics analysis means 203 (more specifically, terminal failure rate calculation means 206, deterioration scale evaluation means 207, deterioration cause estimation means 208, failure number distribution evaluation means 209), observation terminal The number determining means 210 is realized by the CPU of the network management apparatus 200 that operates according to a program, for example. For example, the program is stored in a storage unit (not shown) of the network management apparatus 200, and the CPU reads the program, and in accordance with the program, the quality statistics acquisition unit 201, the quality statistics analysis unit 203 (more specifically, terminal failure) The rate calculating unit 206, the degradation scale evaluating unit 207, the degradation cause estimating unit 208, the failure number distribution evaluating unit 209), and the observation terminal number determining unit 210 may be operated.

  Next, the operation will be described. In the description of the present embodiment, a case will be described as an example where the network management variable storage unit 204 has already stored the upper limit Mx of the number of terminals determined in the past observation period. In the initial state, for the upper limit Mx of the number of terminals, for example, an administrator of the network management apparatus 200 may set an arbitrary value as an initial value.

  The processing from when the quality statistics acquisition unit 201 receives the quality statistics of the communication area X from the quality statistics storage unit 104 until the quality statistics analysis unit 203 displays the analysis result on the display unit 205 is the first process. This is the same as steps S300 to S307 (see FIG. 7) in the embodiment or steps S300 to S307 ′ (see FIG. 14) in the second embodiment.

  FIG. 21 is a flowchart illustrating an example of processing of the observation terminal number determination unit 210 in the present embodiment. The number-of-observation-terminal determining means 210 is, for example, the number of terminals that are individually managed for the communication area X to be managed in response to an instruction from the administrator through an input means (not shown) of the network management apparatus 200. An observation period for determining the upper limit Mx is detected (step S700).

  Next, the number-of-observation-terminals determining unit 210 reads from the quality statistics storage unit 202 the number of communication attempts Ax, the number of communication failures Fx, the number of failed terminals Ux, and the number of communication failures fi for each terminal in the detected observation period ( Step S701). Further, the observation terminal number determining unit 210 reads the threshold value Tx3 of the terminal failure number, the evaluation point Rx of the cumulative number of failure numbers, and the upper limit Mx of the number of individually managed terminals from the network management variable storage unit 204 (step S702).

  Next, the observation terminal number determination means 210 calculates the number of terminals (hereinafter referred to as the number of terminals M1) necessary for accurately evaluating the degradation scale (step S703). The number of terminals M1 is calculated according to Equation 6 shown below, for example.

  Here, int [x] is a function that returns the maximum integer that does not exceed the value of the argument x.

  The observation terminal number determining means 210 calculates the number of terminals (hereinafter referred to as the number of terminals M2) necessary for accurately evaluating the failure number distribution (step S704). The number of terminals M2 is calculated according to Equation 7 shown below, for example.

  The observation terminal number determination means 210 calculates the upper limit of the number of terminals that can be managed individually (hereinafter referred to as the number of terminals M0) from the number of communication areas to be managed and the storage capacity that can be stored in the network management apparatus 200. (Step S705). As the value of the number of terminals M0, for example, the number of terminals may be calculated in consideration of the storage capacity that can be stored in the quality statistics storage unit 202 based on the type of communication event type, the number of communication areas, and the like.

  Based on the number of terminals M1, the number of terminals M2, and the number of terminals M0, the observation terminal number determination means 210 sets the upper limit Mx of the number of terminals to be individually managed in the communication area X, for example, according to Equation 8 below. calculate.

  Here, min (x, y) is a function that returns the smaller value of the arguments x and y, and max (x, y) is a function that returns the larger value of the arguments x and y. It is.

  The observation terminal number determination unit 210 updates the upper limit of the number of terminals stored in the network management variable storage unit 204 with the calculated upper limit Mx of the number of terminals (step S707). The observation terminal number determination unit 210 notifies the observation terminal selection unit 103 of the update (step S708).

  In the above description, the observation terminal number determination means 210 uses the number of communication attempts Ax, the number of communication failures Fx, the number of failed terminals Ux, and the number of communication failures fi for each terminal in Expressions 5 and 6 in the past observation period. The case where it is used has been described as an example. In addition to this, for example, the observation terminal number determination unit 210 uses a time series method such as regression prediction from the values of a plurality of past observation periods, and calculates a value predicted for the observation period to be determined. The equations 5 and 6 may be calculated by using them, but the number of times and the method of calculating the number of terminals are not limited to the above methods.

  According to the present invention, in addition to the configuration of the first embodiment or the second embodiment, the number of managed terminals for each communication area is calculated based on the information stored in the quality statistics storage unit 202. Then, the number is transmitted to the radio base station controller 100. That is, the radio base station controller 100 can dynamically change the upper limit M to be individually managed according to traffic. Therefore, in addition to the effects of the first embodiment or the second embodiment, it is possible to individually manage the number of terminals necessary for the evaluation and more accurately evaluate the deterioration scale and the failure distribution.

  FIG. 22 is a block diagram showing an outline of a communication quality management system in the present invention. The communication quality management system according to the present invention is connected to a mobile communication network and is connected to a communication detection device 8 (for example, a radio base station control device 100) that detects communication in a communication area, and is connected to the mobile communication network. A network management device 9 (for example, the network management device 200) that analyzes communication quality based on communication information detected by the detection device 8 is provided.

  The communication detection device 8 includes the number of communication attempts (for example, the number of attempts Ax) performed by a mobile terminal in the communication area in a predetermined period (for example, the observation period), the number of communication failures (for example, the number of failures Fx), and the like. The period communication information including the total number of mobile terminals that have failed to communicate (for example, the number of failed terminals Ux) and information related to communication failures for each mobile terminal (for example, the number of failures fi, the last update time ti) ) Including communication failure information storage means 81 (for example, quality statistics storage means 104), communication attempts within the communication area (for example, communication events), and communication failures (for example, communication failures). Detecting means 82 (for example, call processing control means 101), and when detecting means 82 detects a communication attempt and a communication failure, a period based on the number of communication attempts and the number of communication failures The communication information registration means 83 (for example, the quality statistics management means 106) that aggregates the communication information and registers it in the communication information storage means 81 and the movement that failed in communication when the detection means 82 detects a communication failure. Terminal failure information for each management target terminal specified by the management target terminal specifying unit 84 (for example, the observation terminal selecting unit 103) and the management target terminal specifying unit 84 that specifies a terminal as a management target terminal for which communication quality is to be calculated. Terminal totaling information registration means 85 (for example, quality statistics totaling means 105) is provided.

  The network management device 9 performs communication based on the period communication information (for example, the number of attempts Ax, the number of failures Fx, the number of failed terminals Ux) stored in the communication information storage unit 81 (for example, the quality statistics storage unit 202). Terminal failure rate calculating means 91 (for example, terminal failure) that calculates a terminal failure rate (for example, terminal failure rate Qx) that indicates the ratio of the number of terminals that have failed to communicate with the number of mobile terminals that have been performed. Rate calculation means 206), deterioration scale evaluation means 92 (for example, deterioration scale evaluation means 207) for evaluating the scale of the number of terminals that suffer quality degradation based on the terminal failure information and the terminal failure rate, Deterioration cause estimating means 93 (for example, deterioration cause estimating means 208) for estimating the cause of quality deterioration based on the scale is provided.

  With such a configuration, it is possible to quickly and accurately estimate the scale of the number of terminals that suffer quality degradation and estimate the cause of quality degradation while reducing the necessary storage capacity.

  That is, the communication detection device 8 can reduce the necessary storage capacity compared to the case of recording information of all terminals that fail to communicate within the communication area, and the time required for data transfer to the network management device 200 is also reduced. Can be suppressed.

  Furthermore, in comparison with a method using a communication failure rate per communication attempt, particularly in an environment where there are terminals that repeatedly fail to communicate (that is, when the number of times of failure Fx ≠ the number of failed terminals Ux), It is possible to more accurately evaluate the scale of the number of terminals that suffer quality degradation.

  Furthermore, even in a wireless cell with relatively little traffic, it is easy to distinguish whether the cause of quality degradation is due to a local dead zone or a terminal failure, or a device failure on the network side. It can be estimated more accurately.

  In the above embodiment, the network management apparatus 9 evaluates the distribution of failure numbers for each mobile terminal based on the period communication information and terminal failure information stored in the communication information storage unit 81. Disclosed is a configuration that includes distribution evaluation means (for example, failure number distribution evaluation means 209), and that causes the deterioration cause estimation means 93 to estimate the cause of quality deterioration based on the size of the number of terminals and the distribution of the number of failures. ing.

  Specifically, the failure number distribution evaluation means is a ratio of the number of failures of individual managed terminals (failure number fi) to the total number of communication failures that occurred in the communication area (for example, the total number of failures (cumulative) F0). Is accumulated according to the increase in the number of management terminals (for example, the accumulation ratio R), and the minimum number of management terminals (for example, the number of terminals Nx) exceeding a predetermined accumulation ratio (for example, the evaluation point Rx) is calculated. When the total number of terminals that have failed to communicate in the communication area is less than a predetermined threshold (for example, threshold Tx4), it is evaluated that the deviation in the distribution of the number of failures is large. It may be evaluated that the distribution of numbers is small.

  With such a configuration, it becomes easy to distinguish between a terminal failure of a specific terminal and a partial failure of a network side device, and the cause can be estimated more accurately.

  Further, the degradation scale evaluation means 92 determines that the scale of the number of terminals suffering quality degradation when the terminal failure rate is less than a predetermined threshold (for example, threshold Tx3) is small, and the terminal failure rate is greater than or equal to the predetermined threshold. In this case, the scale of the number of terminals that suffer quality degradation may be determined to be large.

  Further, when the degradation cause estimating means 93 determines that the scale of the number of terminals that the degradation scale evaluation means 92 suffers from quality degradation is large, a network side device or communication that relays communication between the mobile terminal and the communication detection device is used. When it is estimated that the failure of the relay line to be relayed is the cause of the quality deterioration, and the deterioration scale evaluation means 92 determines that the number of terminals suffering the quality deterioration is small, the failure of a specific mobile terminal or local radio wave It may be estimated that non-sensing is the cause of quality degradation.

  Further, when the degradation cause estimating means 93 determines that the scale of the number of terminals that the degradation scale evaluation means 92 suffers from quality degradation is large, a network side device or communication that relays communication between the mobile terminal and the communication detection device is used. When the failure of the relay line to be relayed is estimated to be the cause of the quality deterioration, and the deterioration scale evaluation means 92 determines that the number of terminals suffering the quality deterioration is small, the failure number distribution evaluation means calculates the failure number distribution. When it is evaluated that the bias is small, it may be estimated that a partial failure of the network side device or local insensitiveness of radio waves is detected.

  In the above-described embodiment, the network management device 9 calculates the number of managed terminals for each communication area based on the terminal failure information (for example, the number of observation terminals determining means 210), Is provided with a transmission means (for example, observation terminal number determination means 210) for transmitting the information to the communication detection device 8.

  Specifically, the number calculation means has the number of quality degradation evaluation terminals (for example, the number of terminals M1), which is the number of individually managed terminals necessary for accurately evaluating the number of terminals suffering quality degradation, and the failure number distribution. The number of distribution evaluation terminals (for example, the number of terminals M1), which is the number of individually managed terminals necessary for accurately evaluating the bias, and the maximum number of terminals (for example, the monitoring information can be stored in the storage area of the communication detection device 8). The number of terminals M0) may be calculated and the number of terminals subject to individual management may be calculated based on the number of quality degradation evaluation terminals, the number of distribution evaluation terminals, and the maximum number of terminals. Specifically, the number calculation means is based on the number of communication attempts in the past observation period, the number of failures, the number of terminals that have failed in communication, and the number of communication failures for each mobile terminal that is managed individually. The number and the number of distribution evaluation terminals may be calculated.

  With such a configuration, it is possible to manage the number of terminals necessary for evaluation individually and more accurately evaluate the deterioration scale and failure distribution.

  Further, when the management target terminal specifying unit 84 specifies the mobile terminal as the management target terminal, if the management target terminal for each communication area exceeds a predetermined number (for example, the upper limit M), the management target terminal is selected. You may limit to below a predetermined number. Specifically, when the management target terminal specifying unit 84 exceeds a predetermined number (for example, the upper limit M) of management target terminals for each communication area, the number of communication failures per unit time in the communication area is large. You may limit a management object terminal to below a predetermined number by selecting with priority from a mobile terminal.

  In addition, the terminal failure rate calculation unit 91 stores the number of communication attempts (for example, the number of attempts Ax), the number of communication failures (for example, the number of failures Fx) stored as the period communication information in the communication information storage unit 81, Communication terminal number calculating means for calculating the number of communication terminals that have performed communication within the communication area (for example, calculating the denominator of Equation 1) based on the total number of mobile terminals that have failed to communicate (for example, the number of failed terminals Ux). And a failure rate calculation means (for example, terminal failure rate calculation means 206) that calculates a terminal failure rate from the ratio of the total number of mobile terminals that failed to communicate and the number of communication terminals (for example, Equation 1). Good.

  In addition, the communication terminal number calculating means excludes the number of communication failures generated by the same mobile terminal repeatedly from the number of communication failures for each communication area, thereby performing communication in the communication area. The number of terminals may be calculated (for example, the denominator of Equation 1 is calculated).

  The present invention is preferably applied to a communication quality management system that manages an index of communication quality for each mobile terminal in a communication area.

It is a block diagram which shows one Embodiment of the communication quality management system in the 1st Embodiment of this invention. It is explanatory drawing which shows the example of a data structure of the quality statistics memory | storage means 104 in the 1st Embodiment of this invention. It is explanatory drawing which shows the example of a structure of the quality statistics analysis means 203 in 1st Embodiment. It is explanatory drawing which shows the example of a data structure of the quality statistics storage means 202 in the 1st Embodiment of this invention. It is explanatory drawing which shows one data structure of the network management variable memory | storage means 204 in the 1st Embodiment of this invention. It is a flowchart which shows the example of a process of the quality statistics management means 106 in 1st Embodiment. It is a flowchart for demonstrating the example of the process of the network management apparatus 200 in this embodiment. It is a flowchart explaining the example of a process of the degradation scale evaluation means 207 in 1st Embodiment. It is a flowchart explaining the example of a process of the deterioration cause estimation means 208 in 1st Embodiment. It is explanatory drawing which showed the example of distribution for every terminal of the frequency of communication failure regarding the communication area X. It is explanatory drawing which shows the example of a structure of the quality statistics analysis means 203 in the 2nd Embodiment of this invention. It is explanatory drawing which shows the example of a data structure of the quality statistics storage means 202 in the 2nd Embodiment of this invention. It is explanatory drawing which shows the example of a data structure of the network management variable memory | storage means 204 by the 2nd Embodiment of this invention. It is a flowchart which shows the example of a process of the network management apparatus 200 in 2nd Embodiment. It is a flowchart explaining the example of a process of the failure number distribution evaluation means 209 in 2nd Embodiment. It is explanatory drawing which shows the example of distribution of the cumulative ratio of the failure number with respect to the number of terminals. It is a flowchart explaining the example of a process of the deterioration cause estimation means 208 in 2nd Embodiment. It is explanatory drawing which showed the example of distribution for every terminal of the frequency of communication failure regarding the communication area X. It is a block diagram which shows one Embodiment of the communication quality management system in the 3rd Embodiment of this invention. It is explanatory drawing which shows the example of a data structure of the network management variable memory | storage means 204 in the 3rd Embodiment of this invention. It is a flowchart which shows the example of a process of the observation terminal number determination means 210 in this embodiment. It is a block diagram which shows the outline | summary of the communication quality management system in this invention. It is the block diagram which showed the example of the structure of the mobile communication network.

Explanation of symbols

10-14 Mobile terminal 20-24 Radio link 30-32 Radio base station 40-46, 40a-45a Wired link 60 Mobile communication core network 70 External network 80-82 Radio cell 100, 100a Radio base station controller 200, 200a network Management apparatus 101 Call processing control means 102 Communication event abnormality detection means 103 Observation terminal selection means 104, 202 Quality statistics storage means 105 Quality statistics aggregation means 106 Quality statistics management means 201 Quality statistics acquisition means 203 Quality statistics analysis means 204 Network management variable storage Means 205 Display means 206 Terminal failure rate calculation means 207 Degradation scale evaluation means 208 Deterioration cause estimation means 209 Failure number distribution evaluation means 300 to 303 Failure distribution terminal distribution

Claims (37)

A communication detection device connected to a mobile communication network for detecting communication in a communication area;
A network management device connected to a mobile communication network and analyzing communication quality based on communication information detected by the communication detection device;
The communication detection device is:
Periodic communication information including the number of communication attempts performed by a mobile terminal in a communication area in a predetermined period, the number of communication failures, and the number of failed terminals indicating the total number of mobile terminals that have failed in the communication, and the mobile terminal Communication information storage means for storing terminal failure information including information on communication failure for each,
A detecting means for detecting a communication attempt in the communication area and a failure of the communication;
When the detecting means detects the communication attempt and the communication failure, the communication information is totaled for the period based on the number of communication attempts and the number of communication failures and registered in the communication information storage means. Information registration means;
When the detection means detects the communication failure, a management target terminal specifying means for specifying a mobile terminal that has failed in the communication as a management target terminal for calculating communication quality;
A terminal total information registration unit that totals the terminal failure information for each management target terminal identified by the management target terminal identification unit and registers the information in the communication information storage unit;
The network management device
Based on the period communication information stored in the communication information storage unit, a terminal failure rate calculating unit that calculates a terminal failure rate indicating a ratio of the number of terminals that failed to communicate with the number of mobile terminals that performed communication;
Degradation scale evaluation means for evaluating the scale of the number of terminals that suffer quality degradation based on the terminal failure information stored in the communication information storage means and the terminal failure rate;
A deterioration cause estimating means for estimating the cause of quality deterioration based on the scale of the number of terminals ;
The degradation scale evaluation means determines that the scale of the number of terminals that suffer quality degradation when the terminal failure rate is equal to or greater than a predetermined threshold is a large scale,
The degradation cause estimation unit relays a network side device or a communication that relays communication between a mobile terminal and the communication detection device when the degradation scale evaluation unit determines that the number of terminals subjected to quality degradation is large. A communication quality management system characterized by estimating failure of a trunk line as a cause of quality degradation . The network management device
Based on the period communication information and terminal failure information stored in the communication information storage means, comprising failure number distribution evaluation means for evaluating the deviation of the failure number distribution for each mobile terminal,
The communication quality management system according to claim 1, wherein the deterioration cause estimation means estimates the cause of quality deterioration based on a scale of the number of terminals and an uneven distribution of the number of failures. The failure number distribution evaluation means calculates a cumulative ratio obtained by adding the ratio of the number of failures of each managed terminal and the total number of communication failures occurring in the communication area in accordance with the increase in the number of management terminals, and calculates a predetermined cumulative ratio. When the minimum number of management terminals exceeding is less than a predetermined threshold with respect to the total number of terminals that failed to communicate in the communication area, it is evaluated that the deviation in the distribution of the number of failures is large, and is greater than or equal to the predetermined threshold The communication quality management system according to claim 2, wherein it is evaluated that the deviation of the distribution of the number of failures is small. The communication quality management system according to any one of claims 1 to 3, wherein the degradation scale evaluation means determines that the scale of the number of terminals that suffer quality degradation is small when the terminal failure rate is less than a predetermined threshold. . The degradation cause estimation means estimates that a failure of a specific mobile terminal or local undetection of radio waves is a cause of quality degradation when the degradation scale evaluation means determines that the number of terminals suffering quality degradation is small. The communication quality management system according to claim 4 . The degradation scale evaluation means determines that the scale of the number of terminals that suffer quality degradation when the terminal failure rate is less than a predetermined threshold is small,
The degradation cause estimation means is when the degradation scale evaluation means determines that the scale of the number of terminals suffering quality degradation is small, and when the failure number distribution evaluation means evaluates that the distribution of failure numbers is small, The communication quality management system according to claim 2, wherein the network side device is estimated to be a partial failure or a local undetected radio wave. The network management device
Based on the terminal failure information, the number calculating means for calculating the number of managed terminals for each communication area,
The communication quality management system according to any one of claims 1 to 6, further comprising transmission means for transmitting the number of units to a communication detection device. The number calculation means is the number of terminals for quality degradation evaluation, which is the number of terminals for individual management necessary for accurately evaluating the number of terminals that suffer quality degradation, and the individual management necessary for accurately assessing the deviation of failure number distribution. Calculating the number of distributed evaluation terminals and the maximum number of terminals that can store monitoring information in the storage area of the communication detection device, and calculating the number of quality degradation evaluation terminals, the number of distribution evaluation terminals, and the maximum number of terminals. The communication quality management system according to claim 7, wherein the number of terminals to be individually managed is calculated based on. The number calculation means is based on the number of communication attempts in the past observation period, the number of failures, the number of terminals that have failed to communicate, and the number of communication failures for each mobile terminal that is individually managed, The communication quality management system according to claim 8, wherein the number is calculated. The management target terminal specifying unit limits the management target terminal to a predetermined number or less when the number of management target terminals for each communication area exceeds a predetermined number when the mobile terminal is specified as the management target terminal. The communication quality management system according to any one of claims 1 to 9. The management target terminal specifying unit manages the management by preferentially selecting a mobile terminal having a large number of communication failures per unit time in the communication area when the number of management target terminals for each communication area exceeds a predetermined number. The communication quality management system according to claim 10, wherein the target terminals are limited to a predetermined number or less. Terminal failure rate calculation means
Based on the number of communication attempts, the number of communication failures, and the total number of mobile terminals that have failed in communication, stored as communication information storage means in the period communication information, the number of communication terminals that have performed communication within the communication area Means for calculating the number of communication terminals to be calculated;
The communication quality management according to any one of claims 1 to 11, further comprising failure rate calculation means for calculating a terminal failure rate from a ratio between the total number of mobile terminals that have failed in communication and the number of communication terminals. system. The number-of-communications-terminal calculating means excludes the number of communication failures generated by the same mobile terminal from the number of communication failures for each communication area, so that the number of communication terminals that have performed communication within the communication area The communication quality management system according to claim 12. A communication detection device connected to a mobile communication network,
Periodic communication information including the number of communication attempts performed by a mobile terminal in a communication area in a predetermined period, the number of communication failures, and the number of failed terminals indicating the total number of mobile terminals that have failed in the communication, and the mobile terminal Communication information storage means for storing terminal failure information including information on communication failure for each,
A detecting means for detecting a communication attempt in the communication area and a failure of the communication;
When the detecting means detects the communication attempt and the communication failure, the communication information is totaled for the period based on the number of communication attempts and the number of communication failures and registered in the communication information storage means. Information registration means;
When the detection means detects the communication failure, a management target terminal specifying means for specifying a mobile terminal that has failed in the communication as a management target terminal for calculating communication quality;
A terminal total information registration unit that totals the terminal failure information for each management target terminal identified by the management target terminal identification unit and registers the information in the communication information storage unit ;
The communication information storage means is a network management device connected to the mobile communication network, and a terminal failure rate indicating a ratio of the number of terminals that have failed in communication to the number of mobile terminals that have performed communication within a communication area is predetermined. Characterized by being referred to by a network side device that relays communication between a mobile terminal and a communication detection device or a network management device that estimates that a failure of a relay line that relays communication is a cause of quality degradation. Communication detection device. The management target terminal specifying unit limits the management target terminal to a predetermined number or less when the number of management target terminals for each communication area exceeds a predetermined number when the mobile terminal is specified as the management target terminal. Item 15. The communication detection device according to Item 14. The management target terminal specifying means, when the number of management target terminals for each communication area exceeds a predetermined number, in the communication area, by preferentially selecting from a mobile terminal having a large number of communication failures per unit time, The communication detection device according to claim 15, wherein the number of management target terminals is limited to a predetermined number or less. Connected to the mobile communication network, the number of communication attempts performed by the mobile terminals in the communication area during a predetermined period, the number of communication failures, and the number of failed terminals indicating the total number of mobile terminals that failed the communication. From the communication detection device that stores the communication information and the terminal failure information in which the information related to the communication failure is counted for each management target terminal specified as the communication quality calculation target among the mobile terminals that have failed in the communication. A network management device that receives period communication information and terminal failure information,
Based on the period communication information stored in the communication detection device, a terminal failure rate calculating means for calculating a terminal failure rate indicating a ratio of the number of terminals that failed to communicate with the number of mobile terminals that performed communication;
Degradation scale evaluation means for evaluating the scale of the number of terminals that suffer quality degradation based on the terminal failure information and the terminal failure rate;
A deterioration cause estimating means for estimating the cause of quality deterioration based on the scale of the number of terminals ;
The degradation scale evaluation means determines that the scale of the number of terminals that suffer quality degradation when the terminal failure rate is equal to or greater than a predetermined threshold is a large scale,
The degradation cause estimation unit relays a network side device or a communication that relays communication between a mobile terminal and the communication detection device when the degradation scale evaluation unit determines that the number of terminals subjected to quality degradation is large. A network management apparatus characterized in that a failure in a trunk line is estimated to cause quality degradation . Based on the period communication information and terminal failure information stored in the communication detection device, comprising failure number distribution evaluation means for evaluating the deviation of the failure number distribution for each mobile terminal,
18. The network management device according to claim 17, wherein the deterioration cause estimation means estimates the cause of quality deterioration based on a scale of the number of terminals and a deviation in the distribution of the number of failures. The failure number distribution evaluation means calculates a cumulative ratio obtained by adding the ratio of the number of failures of each managed terminal and the total number of communication failures occurring in the communication area in accordance with the increase in the number of management terminals, and calculates a predetermined cumulative ratio. When the minimum number of management terminals exceeding is less than a predetermined threshold with respect to the total number of terminals that failed to communicate in the communication area, it is evaluated that the deviation in the distribution of the number of failures is large, and is greater than or equal to the predetermined threshold The network management device according to claim 18, wherein the network management device is evaluated as having a small distribution of failure numbers. The network management device according to any one of claims 17 to 19, wherein the degradation scale evaluation unit determines that the scale of the number of terminals that experience quality degradation is small when the terminal failure rate is less than a predetermined threshold. The degradation cause estimation means estimates that a failure of a specific mobile terminal or local undetection of radio waves is a cause of quality degradation when the degradation scale evaluation means determines that the number of terminals suffering quality degradation is small. The network management device according to claim 20 . The degradation scale evaluation means determines that the scale of the number of terminals that suffer quality degradation when the terminal failure rate is less than a predetermined threshold is small,
The degradation cause estimation means is when the degradation scale evaluation means determines that the scale of the number of terminals suffering quality degradation is small, and when the failure number distribution evaluation means evaluates that the distribution of failure numbers is small , The network management device according to claim 19, wherein the network management device estimates a partial failure of the network side device or local undetection of radio waves. Based on the terminal failure information, the number calculating means for calculating the number of managed terminals for each communication area,
The network management device according to any one of claims 17 to 22, further comprising transmission means for transmitting the number of units to a communication detection device. The number calculation means is the number of terminals for quality degradation evaluation, which is the number of terminals for individual management necessary for accurately evaluating the number of terminals that suffer quality degradation, and the individual management necessary for accurately assessing the deviation of failure number distribution. Calculating the number of distributed evaluation terminals and the maximum number of terminals that can store monitoring information in the storage area of the communication detection device, and calculating the number of quality degradation evaluation terminals, the number of distribution evaluation terminals, and the maximum number of terminals. The network management device according to claim 23, wherein the number of terminals to be individually managed is calculated based on. The number calculation means is based on the number of communication attempts in the past observation period, the number of failures, the number of terminals that have failed to communicate, and the number of communication failures for each mobile terminal that is individually managed, The network management device according to claim 24, wherein the number is calculated. Terminal failure rate calculation means
A communication terminal that calculates the number of communication terminals that have performed communication in the communication area from the number of communication attempts stored as communication information in the communication detection device, the number of communication failures, and the total number of mobile terminals that have failed to communicate. Number calculating means;
The network management device according to any one of claims 17 to 25, further comprising failure rate calculation means for calculating a terminal failure rate from a ratio between a total number of mobile terminals that have failed in communication and the number of communication terminals. . The number-of-communications-terminal calculating means excludes the number of communication failures generated by the same mobile terminal from the number of communication failures for each communication area, so that the number of communication terminals that have performed communication within the communication area The network management device according to claim 26. A detection step of detecting a communication attempt in the communication area and a failure of the communication;
When a communication failure is detected in the detection step, a management target terminal specifying step for specifying a mobile terminal that has failed in communication as a management target terminal for calculating communication quality;
Terminal aggregation information registration step of totalizing terminal failure information including information regarding communication failure for each management target terminal identified in the management target terminal identification step, and registering in the communication information storage means;
When the detection step detects the communication attempt and the communication failure, the communication attempt performed by the mobile terminal in the communication area during a predetermined period based on the number of communication attempts and the number of communication failures. A communication information registration step of totalizing the period communication information including the number of times, the number of times the communication has failed, and the number of failed terminals indicating the total number of mobile terminals that have failed in the communication, and registering in the communication information storage unit;
Based on the period communication information stored in the communication information storage means, a terminal failure rate calculation step of calculating a terminal failure rate indicating a ratio of the number of terminals that failed to communicate with the number of mobile terminals that performed communication;
Degradation scale evaluation step for evaluating the scale of the number of terminals suffering quality degradation based on the terminal failure information stored in the communication information storage means and the terminal failure rate;
On the basis of the scale of the number of the terminal, only including the deterioration cause estimation step of estimating the cause of quality deterioration,
In the degradation scale evaluation step, when the terminal failure rate is equal to or higher than a predetermined threshold, the scale of the number of terminals that suffer quality degradation is determined to be large,
A network-side device or communication that relays communication between a mobile terminal and a communication detection device that detects communication in the communication area when the deterioration cause estimation step determines that the number of terminals subjected to quality deterioration is large. A communication quality management method characterized in that a failure of a relay line that relays a message is estimated as a cause of quality degradation . Based on the period communication information and terminal failure information stored in the communication information storage means, including a failure number distribution evaluation step for evaluating the bias of the failure number distribution for each mobile terminal,
The communication quality management method according to claim 28, wherein the cause of quality deterioration is estimated based on a scale of the number of terminals and a distribution of the number of failures in the deterioration cause estimation step. A detection step of detecting a communication attempt in the communication area and a failure of the communication;
When a communication failure is detected in the detection step, a management target terminal specifying step for specifying a mobile terminal that has failed in communication as a management target terminal for calculating communication quality;
The terminal failure information including information related to communication failure is aggregated for each managed terminal identified in the managed terminal identifying step, the number of communication attempts performed by the mobile terminal in the communication area in a predetermined period, and the communication Communication information storage means for storing a period communication information including the number of times of failure and the number of failed terminals indicating the total number of mobile terminals that have failed in the communication, and terminal failure information including information regarding communication failures for each mobile terminal A terminal aggregation information registration step to be registered;
When the detection step detects the communication attempt and the communication failure, the communication attempt performed by the mobile terminal in the communication area during a predetermined period based on the number of communication attempts and the number of communication failures. frequency and a failure count of the communication, by aggregating the period communication information including the number of failures terminal indicating the total number of mobile terminal fails in the communication, including a communication information registration step of registering the communication information storage unit See
The communication information storage means communicates with the mobile terminal in the communication area when a terminal failure rate indicating a ratio of the number of terminals that have failed in communication to the number of mobile terminals that have performed communication within the communication area is equal to or greater than a predetermined threshold. A communication detection method that is referred to when a failure of a network side device that relays communication with a communication detection device to be detected or a failure of a relay line that relays communication is estimated to be a cause of quality degradation . When the mobile terminal is specified as a management target terminal in the management target terminal specifying step, if the number of management target terminals for each communication area exceeds a predetermined number, the management target terminal is limited to a predetermined number or less. Item 30. The communication detection method according to Item 30. Based on the period communication information including the number of communication attempts performed by the mobile terminals in the communication area in a predetermined period, the number of communication failures, and the number of failed terminals indicating the total number of mobile terminals that failed the communication. A terminal failure rate calculating step for calculating a terminal failure rate indicating a ratio of the number of terminals that failed to communicate with the number of mobile terminals that performed communication;
Among the mobile terminals that have failed in communication, for each management target terminal that is specified as a communication quality calculation target, the terminal that suffers quality degradation based on the terminal failure information that totals information related to communication failure and the terminal failure rate A degradation scale assessment step for assessing the scale of the number;
On the basis of the scale of the number of the terminal, only including the deterioration cause estimation step of estimating the cause of quality deterioration,
In the degradation scale evaluation step, when the terminal failure rate is equal to or higher than a predetermined threshold, the scale of the number of terminals that suffer quality degradation is determined to be large,
A network-side device or communication that relays communication between a mobile terminal and a communication detection device that detects communication in the communication area when the deterioration cause estimation step determines that the number of terminals subjected to quality deterioration is large. A network management method characterized in that it is estimated that a failure of a relay line that relays a cause of quality degradation . Based on the period communication information and terminal failure information, including a failure number distribution evaluation step for evaluating the bias of the failure number distribution for each mobile terminal,
33. The network management method according to claim 32, wherein the cause of quality deterioration is estimated based on a size of the number of terminals and an uneven distribution of the number of failures in the deterioration cause estimation step. A communication detection program mounted on a computer connected to a mobile communication network,
In the computer,
A detection process for detecting a communication attempt in the communication area and a failure of the communication;
In the detection process, when the communication failure is detected, a management target terminal specifying process for specifying a mobile terminal that has failed in the communication as a management target terminal to be a communication quality calculation target;
Periodic communication information including the number of communication attempts performed by a mobile terminal in a communication area in a predetermined period, the number of communication failures, and the number of failed terminals indicating the total number of mobile terminals that have failed in the communication, and the mobile terminal Terminal total information registration for totaling and registering the terminal failure information for each managed terminal identified in the managed terminal identification process in the communication information storage means for storing terminal failure information including information regarding communication failure for each Processing and
Communication that aggregates period communication information based on the number of communication attempts and the number of communication failures when it detects the communication attempt and the communication failure in the detection process, and registers the communication information in the communication information storage unit Run the information registration process ,
The communication information storage means communicates with the mobile terminal in the communication area when a terminal failure rate indicating a ratio of the number of terminals that have failed in communication to the number of mobile terminals that have performed communication within the communication area is equal to or greater than a predetermined threshold. Referenced when the failure of the network side device that relays communication with the communication detection device to be detected or the failure of the relay line that relays communication is estimated to be the cause of quality degradation
A communication detection program characterized by that . On the computer,
When a mobile terminal is specified as a management target terminal in the management target terminal specifying process, if the number of management target terminals for each communication area exceeds a predetermined number, the management target terminal is limited to a predetermined number or less. Item 35. The communication detection program according to Item 34. Connected to the mobile communication network, the number of communication attempts performed by the mobile terminals in the communication area during a predetermined period, the number of communication failures, and the number of failed terminals indicating the total number of mobile terminals that failed the communication. From the communication detection device that stores the communication information and the terminal failure information in which the information related to the communication failure is counted for each management target terminal specified as the communication quality calculation target among the mobile terminals that have failed in the communication. A network management program installed in a computer that receives period communication information and terminal failure information,
In the computer,
Based on the period communication information, a terminal failure rate calculation process for calculating a terminal failure rate indicating a ratio of the number of terminals that failed to communicate with the number of mobile terminals that performed communication,
Based on the terminal failure information and the terminal failure rate, a degradation scale evaluation process for evaluating the scale of the number of terminals that suffer quality degradation, and
Based on the scale of the number of terminals, the cause of quality degradation is estimated to be executed ,
In the degradation scale evaluation process, when the terminal failure rate is equal to or greater than a predetermined threshold, the scale of the number of terminals that suffers quality degradation is determined to be large,
A failure of the network side device that relays communication between the mobile terminal and the communication detection device or the failure of the relay line that relays communication when the scale of the number of terminals that suffer quality degradation is determined to be large in the deterioration cause estimation process Is a network management program that makes it possible to estimate the cause of quality degradation . On the computer,
Based on the period communication information and terminal failure information stored in the communication detection device, to perform a failure number distribution evaluation process to evaluate the distribution of failure number distribution for each mobile terminal,
37. The network management program according to claim 36, wherein the cause of quality deterioration is estimated based on the size of the number of terminals and the distribution of the number of failures in the cause of deterioration estimation process.

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