JP2006332837A - Mobile communication system, line controller, mobile communication method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication system for preventing communication from becoming impossible in a mobile station managed by an HLR when trouble occurs in the HLR. <P>SOLUTION: A BSC comprises an HLR trouble detection function for detecting the trouble in the HLR; and an HLR substitute function for managing position information equal to the HLR inside the BSC, and using the position information inside the BSC when the trouble occurs in the HLR. As a result, the trouble in the HLR is detected in the BSC when the trouble occurs in the HLR actually, and the BSC performs switching to a subsequent communication request from the mobile station so that an acquisition is made from the position information managed inside the BSC instead of information acquired from the normal HLR. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile communication system, a line control device, a mobile communication method, and a program for managing location information and the like of a mobile station by a management device, and performing the proxy of the management device by another device when a failure occurs in the management device.

  Conventionally, in a mobile communication system, when a home location register (Home Location Register: hereinafter referred to as HLR) that manages location information and registration information of a mobile station becomes a failure, communication of the mobile station managed by the HLR is performed. Becomes impossible. In other words, mobile stations located in the area where the HLR is installed cannot be transmitted or received, the system is down in the unit of the area, and communication is impossible until the HLR is restored. In order to prevent such a situation from occurring and to improve the safety of the apparatus, it has been generally performed in the past to adopt a duplex configuration of the HLR itself, but this duplex configuration itself is an expensive system. Since it is a structure, a cost side will increase. In addition, when the duplex configuration is used, complicated processing such as information synchronization (mirroring) is required, and the data synchronization processing also has a complicated system configuration.

  Specifically, referring to FIG. 2, in the conventional configuration, when the HLR (2A) becomes an obstacle, communication in the district 1 and communication from the district 1 to another district (district 2 in FIG. 2), or Communication from other districts to district 1 becomes impossible, and in district 1 the system goes down.

As a prior art example of a mobile communication system using a mobile device, there is a “path connection control method in a CDMA mobile communication system” that predicts a state transition of a mobile device in the near future and determines a base station that establishes a path (for example, Patent Document 1). In addition, by detecting the transmission power of the downlink signal transmitted from the base station to the mobile device, the presence of the mobile device having a broken reception system is detected, and the downlink transmission power is detected by the downlink transmission power increase request from the failed mobile device. There is a “CDMA system and a faulty mobile device detection method” that prevents an unnecessary increase from occurring (see, for example, Patent Document 2). In addition, a plurality of line control devices are connected to one private branch exchange and connected to each other via a dedicated communication channel highway, and a database management device is provided to connect to a plurality of line control devices via a LAN highway. There is a “wireless communication system” that performs position registration and zone switching (see, for example, Patent Document 3). In addition, there is a “mobile terminal incoming call control system” in which a mobile communication system can be easily constructed using an exchange that does not have a function of controlling the line of the mobile terminal (see, for example, Patent Document 4).
JP 2000-217138 A Japanese Patent Laid-Open No. 2003-18068 JP-A-6-339174 Japanese Patent Laid-Open No. 9-322247

  However, in the inventions of Patent Documents 1 to 4, other devices cannot perform the HLR management function in the event of an HLR failure.

  From the above, in the present invention, in FIG. 2, the location information of the mobile station held in the HLR (2A) at the normal time is also managed in the BSC to share the information. The purpose is to make a substitution. As a result, even if the HLR (2A) becomes a failure, the communication service can be continued without causing the entire district to go down. Moreover, in terms of cost, it is possible to manage the location information by using the BSC, which is an indispensable device for the system, rather than implementing the HLR duplex configuration without installing a new duplex HLR. Since the system configuration can be implemented by adding an additional function, a system configuration that is less expensive than the duplex configuration is possible. In addition, in the duplex configuration processing, complicated processing such as synchronization processing and switching processing between the duplexed devices occurs, but in the present invention, the HLR is recognized as a failure from the viewpoint of the BSC. For example, since processing is performed with position information inside the BSC, the processing is simple.

  Therefore, in the mobile communication system, when a failure occurs in the HLR that manages the location information and registration information of the mobile station, the line control device (Base Station) prevents the mobile station managed by the HLR from being disabled. The object is to provide a mobile communication system, a line control device, a mobile communication method, and a program capable of preventing communication failure at the time of HLR failure by managing the location information of the mobile station inside the controller (hereinafter referred to as “BSC”). And

  In order to achieve this object, the invention described in claim 1 includes a mobile station, a line control device that communicates with the mobile station, and a management device that communicates with the line control device and manages the mobile station. The line control device performs the function of the management device.

  According to a second aspect of the present invention, there is provided a mobile communication system comprising: a line control device that communicates with a mobile station via a radio base station; and a management device that communicates with the line control device and manages position information of the mobile station. The line control device includes a location information management unit that manages the same location information as the location information managed by the management device, a fault detection unit that detects and recognizes a fault in the management device, and a fault in the management device. And switching means for switching to use location information managed by the location information management means, and performs location registration processing and connection processing for communication requests on behalf of the function of the management device. It is characterized by that.

  According to a third aspect of the present invention, in the second aspect of the invention, the failure detection means waits for a first determination based on the presence or absence of a health check response from the management device and a location registration response from the management device. And performing a second determination based on the number, and detecting a failure of the management device based on the results of the first determination and the second determination.

  According to a fourth aspect of the present invention, in the second or third aspect of the present invention, the location information management means manages the registration information of the mobile station together with the location information.

  The invention described in claim 5 is characterized in that it communicates with a mobile station and a management apparatus that manages the mobile station, and performs the function of the management apparatus.

  The invention according to claim 6 is a line control device that communicates with a mobile station via a radio base station and communicates with a management device that manages location information of the mobile station, and is managed by the management device. Position information management means for managing the same position information as the existing position information, a failure detection means for detecting and recognizing a failure of the management apparatus, and a position managed by the position information management means after recognizing the failure of the management apparatus Switching means for switching to use information, and performing a location registration process and a connection process for a communication request on behalf of the function of the management apparatus.

  According to a seventh aspect of the invention, in the sixth aspect of the invention, the failure detection means waits for a first determination based on the presence / absence of a health check response from the management device and a location registration response from the management device. And performing a second determination based on the number, and detecting a failure of the management device based on the results of the first determination and the second determination.

  The invention according to claim 8 is the invention according to claim 6 or 7, wherein the location information management means manages registration information of the mobile station together with the location information.

  The invention according to claim 9 uses a mobile station, a line control device that communicates with the mobile station, and a management device that communicates with the line control device and manages the mobile station. It is characterized by acting the function of

  According to a tenth aspect of the present invention, there is provided a mobile communication apparatus using a line control apparatus that communicates with a mobile station via a radio base station, and a management apparatus that communicates with the line control apparatus and manages location information of the mobile station. In the communication method, the line control device includes a location information registration step for registering the same location information as the location information managed by the management device, a failure detection step for detecting and recognizing a failure of the management device, and the management device A switching step for switching to use the location information managed in the location information management step after recognizing the failure, and performing a location registration process and a connection process for a communication request on behalf of the function of the management device It is characterized by performing.

  The invention according to claim 11 is the invention according to claim 10, wherein in the failure detection step, the first determination is made based on the presence or absence of a health check response from the management device, and the location registration response from the management device And performing a second determination based on the number of waits, and detecting a failure of the management device based on the results of the first determination and the second determination.

  The invention described in claim 12 is characterized in that, in the invention described in claim 10 or 11, registration information of the mobile station is registered together with the position information in the position information registration step.

  According to the thirteenth aspect of the present invention, the line control apparatus is caused to execute a process that performs the function of the management apparatus that manages the mobile station.

  The invention described in claim 14 is a location information registration process for registering the same location information as the location information managed by the management device in the line control device communicating with the mobile station, and detecting and recognizing the failure of the management device. Failure detection processing to be performed, switching processing to switch to using the location information managed by the location information management processing after recognizing the failure of the management device, and location registration processing and communication on behalf of the management device function Execute connection processing for the request.

  A fifteenth aspect of the present invention is the management apparatus according to the fourteenth aspect of the present invention, wherein the line control device is configured to cause the line detection device to perform a first detection process based on the presence or absence of a health check response from the management device. And a second determination process that is determined based on the number of waiting for the location registration response from, and a failure of the management device is detected based on the results of the first determination and the second determination.

  According to a sixteenth aspect of the invention, in the invention according to the fourteenth or fifteenth aspect, the line control apparatus is caused to execute a process of registering registration information of a mobile station together with the position information in the position information registration process.

  According to the present invention, it is possible to continue communication without system failure at the time of an HLR failure, and to realize a function as a substitute for HLR by adding a function to a BSC having an existing system configuration. Compared to the cost of duplicating HLR, the system can be constructed at a low cost.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

  According to the present invention, in a mobile communication system, the management device and other devices manage both the location information of the mobile station (information indicating the area in which the mobile station is located), and the other device acts as a proxy when the management device fails Thus, the position information can be used even at the time of failure.

  FIG. 1 is a diagram illustrating a configuration of a mobile communication system according to the present embodiment. The HLR in FIG. 1 is a management device that performs location information management and registration information management of mobile stations (ML: land mobile stations) per district. Usually, a mobile station belongs to one HLR as a home (district), and the HLR manages position information where the mobile station is located in that area. Therefore, by managing the location information indicating where each mobile station is located in the HLR, it is possible to process outgoing / incoming calls for each mobile station managed in the HLR. The HLR is also a management device that manages location information and registration information of mobile stations in units of districts.

  On the other hand, the Visitor Location Register (VLR) is a management device that temporarily manages the location information of mobile stations located outside the home area where the HLR is installed. .

  In FIG. 1, when an HLR becomes a failure, outgoing and incoming calls from mobile stations under the HLR management are disabled. Therefore, as a feature of the present invention, the BSC acquires and registers the HLR failure detection function for detecting the HLR failure on the BSC side when the HLR fails, and the location information equivalent to the HLR in the BSC in advance from the HLR for registration. The HLR function is substituted by having a location information management function for switching and a switching function for switching to use location information managed in the BSC at the time of an HLR failure. That is, when the HLR actually becomes a failure, the BSC detects the HLR failure by the HLR failure detection function, and the BSC obtains from the normal HLR by the switching function in response to a subsequent communication request from the mobile station. Instead of the information that has been used, the location information management function is switched to obtain the location information registered in advance and managed in the BSC. Therefore, information equivalent to the information acquired from the HLR during the communication processing (during connection) can be acquired from the inside of the BSC, and communication can be continued even after the HLR failure. Therefore, according to the present invention, communication can be performed without system failure at the time of a conventional HLR failure.

FIG. 3 is a diagram showing a system configuration of a conventional mobile communication system.
As shown in FIG. 3, when the mobile station (ML1) moves from the wireless zone (5A-1) to the wireless zone (5B-2), the mobile station (ML1) makes a location registration request by switching the wireless zone. Transmit to BTS (4B-2). The location registration request is a function of notifying the HLR (2A) of the wireless zone in which the mobile station is located. Further, the HLR side not only manages in which radio zone the mobile station is in the location registration, but also checks whether the information of the mobile station is correct. This process is performed to confirm whether there is an unauthorized mobile station. Therefore, the location registration request of the mobile station (ML1) shown in FIG. 3 is moving between the districts, and the HLR (2B) on the district 2 side has no information on the mobile station (ML1) and is processed by the VLR (1). However, it is the HLR (2A) that actually manages the mobile station (ML1). Therefore, since the information management of the mobile station (ML1) is only the HLR (2A), the VLR (1) requests the HLR (2A) to acquire the position information of the mobile station, and the VLR (1) also acquires the position information. Acquire and process for location registration. When the mobile station (ML1) is located in a region other than the district 1, the VLR temporarily takes over and manages the location information. That is, in the VLR (1), the location information of the mobile station (ML1) is updated from the wireless zone (5A-1) to the wireless zone (5B-2).

  On the other hand, in FIG. 3, when the wireless zone in the district 1 is moved like the mobile station (ML2), the location information in the HLR (2A) is changed from the wireless zone (5A-1) to the wireless zone (5A-2). Update to By managing the location information, the radio zone in which each mobile station is located is managed by the HLR or VLR. As a result, in response to a communication connection request to each mobile station, the BSC acquires the location information of the corresponding mobile station managed by the HLR or VLR, and to which radio zone the mobile station is located. Understandably, communication connection becomes possible. This process is a process in which the BSC performs connection processing at the time of conventional location registration management and communication request from a mobile station.

  However, in FIG. 3, when the HLR (2A) becomes a failure, even if the mobile station (ML1) and the mobile station (ML2) move in the wireless zone, the HLR (2A) managing both mobile stations In the case of the mobile station (ML1), the VLR side cannot acquire the necessary information of the mobile station (ML1), and as a result, the VLR (1) performs the location registration process. I can't. Also in the case of the mobile station (ML2), the fact that the wireless zone has moved from (5A-1) to (5A-2) cannot be managed due to the failure of the HLR (2A). That is, both cannot perform location registration processing and location registration management. Therefore, it is not known in which radio zone each mobile station is located because the mobile station cannot be managed, and even in the case of BSC (3A), the corresponding mobile station is located in which radio zone each time a communication request is made. Therefore, the communication connection itself is not possible, and the outgoing / incoming call and location registration processing of the mobile station managed by the HLR (2A) becomes impossible.

  In this embodiment, in FIG. 3, even if the HLR (2A) becomes a failure, information equivalent to the location information of the mobile station managed by the HLR (2A) is retained in the BSC (3A) from the normal time. As a result, when the BSC (3A) recognizes an HLR (2A) failure, the wireless zone in which the mobile station is located can be acquired based on the location information managed inside the BSC. Thus, the location registration and communication service can be continued without causing the location registration and communication of the mobile station managed by the HLR (2A) to become impossible.

The operation of this embodiment will be described. The BSC of this embodiment performs the following processing operations under program control.
The BSC of this embodiment detects the location information managed by the HLR during normal times from the HLR in advance, registers and manages the location information (location information management means), and detects that the HLR has become a failure at the time of failure. And a function (switching means) for switching to use position information managed in the BSC (for example, a database) after recognizing an HLR fault. The location registration process and the connection process for the communication request are performed continuously without going down. Therefore, the BSC of the present embodiment has an HLR location registration / information management proxy function.

  First, FIG. 4 and FIG. 5 show the difference in location registration / information management between the conventional system and the system of this embodiment. FIG. 4 shows location registration within the same district, (a) is a diagram showing a conventional BSC location registration process (without holding location information), and (b) is a BSC location registration process of the present invention. It is a figure showing (holding of position information). FIG. 5 shows location registration in another area, (a) is a diagram showing a conventional BSC location registration process (no location information retention), and (b) is a BSC location registration process ( FIG.

  When moving within the same area shown in FIG. 3 (indicating movement of ML2 in FIG. 3), as shown in FIG. 4A, the conventional system uses BSC for location registration from the mobile station (ML). (In the same case, in the system of this embodiment, as shown in FIG. 4B, a database (DB2) that can register the location in the BSC at the time of response to the request is added. To manage location information.

  When the mobile station moves from a predetermined district to another district, that is, when moving from district 1 to district 2 or from district 2 to district 1 shown in FIG. 3 (indicating the movement of ML1 in FIG. 3), As shown in FIG. 5 (a), the system sends a request for information acquisition (acquisition request 1) to the HLR managed by the mobile station in response to the location registration from the mobile station (ML). Information is acquired on the VLR side (acquisition response 1), and a location registration process is performed. In the same case, even in the system of the present embodiment, when the acquisition request is made, the HLR notifies the BSC side of location information (update request 1 in FIG. 5B), so that information equivalent to the HLR is acquired and managed on the BSC side at normal times. can do. That is, as shown in FIG. 6, the BSC of the system of the present embodiment has a function of managing location information equivalent to the HLR in addition to the function as a conventional BSC line controller (switch).

Next, HLR failure detection by BSC will be described.
There are two methods (determination 1 and decision 2) for detecting an HLR failure by BSC. Judgment 1 is a method of periodically monitoring the status between devices between the BSC and the HLR. If the BSC sends a health check request (status monitoring message) to the HLR and the HLR receives the request, the HLR sends a health check response to the BSC so that the BSC can recognize the reception. Send to. As a result, it is possible to check whether each other's devices are normal or abnormal at a constant cycle. Therefore, as shown in FIG. 8A, the BSC determines the presence / absence of a health check response by monitoring the status between devices (step S1). If there is a response (Step S1 / Yes), the HLR is recognized as normal (Step S3), and if there is no response (Step S1 / No), the HLR is recognized as a failure (Step S2). .

  In decision 2, as shown in FIGS. 4A and 4B, when a location registration request is received from a mobile station, the normal BSC issues a location registration request to the HLR. If the HLR side is normal for this request, a response is sent to the BSC side (showing response 1 in FIG. 4). However, if the HLR is faulty, even if a location registration request is transmitted from the BSC to the HLR, there is no response from the HLR (see FIGS. 7A and 7B), and the BSC is in a location registration response waiting state. Become. Here, as shown in FIG. 8B, the BSC determines the number of waiting for a response to the location information inquiry to the HLR (step S11). When the number of location registration inquiry response waits is less than or equal to a preset number (step S11 / specified value or less), the HLR is recognized as normal (step S13), and the location registration inquiry response wait number is preset. If the number is greater than or equal to the number (step S11 / specified value or more), the HLR is recognized as a failure (step S12).

  Thus, the BSC recognizes the failure of the HLR by making two determinations. In each of the determinations 1 and 2, if a request or response message is lost on the line between devices and a sudden increase in location registration requests occurs in a short period of time, the determination 2 erroneously recognizes an HLR failure. Therefore, HLR failure detection is performed by two determinations, determination 1 and determination 2. An example of the determination result is shown in the table of FIG.

  When the BSC recognizes that the HLR has failed by the HLR failure detection method (determination 1 and determination 2), the BSC performs processing for a subsequent location registration request from the mobile station, and location information management and communication of the mobile station. Instead of making an acquisition request to the normal HLR as a search for the wireless zone in which the connected mobile station is located in response to the request, a database (DB) inside the BSC holding location information equivalent to the HLR is used. It switches to use, performs location registration and communication connection processing, and acts as an HLR function. Therefore, the system operation as the mobile communication system can be continued without deteriorating the communication service.

  Conventionally, when an HLR failure occurs when a mobile station moves within the same area (see FIG. 7A) or when the mobile station moves between areas (see FIG. 9A), No response is received, and the BSC does not perform the HLR proxy function. Therefore, the location registration of the mobile station managed by the HLR and the transmission / reception of communication cannot be performed, resulting in a system down in the district unit. . However, in the present invention, when the mobile station moves within the same area (see FIG. 7B) or when the mobile station moves between the areas (see FIG. 9B), an HLR failure has occurred. Even in this case, the response from the HLR is performed by providing the DB2, and the BSC performs the HLR proxy function, so that it is possible to avoid a system down in each district.

  In addition, in this embodiment, a system configuration can be made without affecting the conventional system construction by adding a function to an existing device (BSC) without adding a new device to the conventional mobile communication system. is there. Conventionally, duplication of the HLR device itself is more mainstream than sharing management of functions between the HLR and the BSC, and duplication itself is complicated in terms of the system. As shown in FIG. 10, the conventional general duplexing includes switching management between the active system and the standby system, and management of synchronization (mirroring) of position information and registration information between the respective duplexing apparatuses. Complex processing occurs.

  In addition, monitoring between devices between the BSC and HLR itself is a necessary process even if the HLR is duplicated in the conventional system, and even in the existing configuration, the BSC recognizes that the HLR has become an obstacle. Is possible. For example, as shown in FIG. 11A, when the HLR duplex configuration is used, a health check is performed between the HLR (active system) and the BSC to check each other's operational status, and As shown in FIG. 11B, even when the HLR duplex configuration is not implemented, a health check is performed between the HLR and the BSC to check each other's operation status.

  Therefore, in this embodiment, BSC's HLR proxy function is added to the conventional device configuration, and the HLR duplication is not performed, and the system does not differ from the conventional configuration, so that communication in one district due to an HLR failure is prevented. It becomes possible to prevent.

  As described above, according to the present embodiment, communication in one district at the time of HLR failure is not possible by adding the function of holding the location information of the mobile station to the BSC itself without changing the current mobile communication system configuration. Can be prevented. Moreover, it is cheaper and can be easily constructed compared to a configuration in which the HLR device is duplicated.

  In the present embodiment, as an additional function of the BSC, the location information management means such as a database manages the location information of the mobile station. However, a function for holding the registration information of the mobile station is added. Also good. Thereby, it is possible to substitute not only as a backup as a system but also as an HLR backup.

  As mentioned above, although the Example of this invention was described, it is not limited to the said Example, A various deformation | transformation is possible in the range which does not deviate from the summary.

  The present invention can be applied to a mobile communication system intended for mobile communication terminals used in a wide range of wireless zones.

It is a figure which shows the structure of the mobile communication system of this invention. It is a figure which shows an example of a structure of a general mobile communication system. It is a figure which shows an example of a structure of a general mobile communication system. (A) is a figure which shows the position registration process of the conventional BSC, (b) is a figure which shows the position registration process of BSC of this invention. (A) is a figure which shows the position registration process of the conventional BSC, (b) is a figure which shows the position registration process of BSC of this invention. It is a figure which shows the function sharing regarding the location registration of BSC and HLR. (A) is a figure which shows the position registration process of the conventional BSC, (b) is a figure which shows the position registration process of BSC of this invention. (A) is a flowchart showing the process of decision 1, (b) is a flowchart showing the process of decision 2, and (c) is a table showing the judgment result of the HLR failure state of the BSC. (A) is a figure which shows the position registration process of the conventional BSC, (b) is a figure which shows the position registration process of BSC of this invention. It is a figure which shows the process in the duplex structure of HLR. (A) is a diagram showing communication processing with the BSC in the HLR duplex configuration, and (b) is the HLR when there is no HLR duplex configuration. It is a figure which shows the communication process of BSC.

Explanation of symbols

1 Visitor location register (VLR, an example of a management device)
2A, 2B Home location register (HLR, example of management device)
3A, 3B line controller (BSC)
4-1, 4-2, 4-3, 4-4, 4A-1, 4A-2, 4B-1, 4B-2 Radio base station (BTS)
5, ML1, ML2 Mobile station (ML)
5A-1, 5A-2, 5B-1, 5B-2 Wireless zone SW-HUB1, SW-HUB2 Layer 3 switching hub DB1, DB2 Database (an example of location information management means)

Claims (16)

A mobile station, a line control device that communicates with the mobile station, and a management device that communicates with the line control device and manages the mobile station,
The mobile communication system, wherein the line control device performs the function of the management device. A line control device for communicating with a mobile station via a radio base station;
A management device that communicates with the line control device and manages location information of the mobile station;
A mobile communication system comprising:
The line control device
Position information management means for managing the same position information as the position information managed by the management device;
Failure detection means for detecting and recognizing a failure of the management device;
And switching means for switching to use position information managed by the position information management means after recognizing a failure of the management device,
A mobile communication system that performs location registration processing and connection processing in response to a communication request in place of the function of the management device. The failure detection means includes
A first determination based on the presence or absence of a health check response from the management device;
Performing a second determination based on the number of waiting for a location registration response from the management device,
The mobile communication system according to claim 2, wherein a failure of the management device is detected based on a result of the first determination and the second determination.   4. The mobile communication system according to claim 2, wherein the location information management means manages registration information of the mobile station together with the location information.   A line control device that communicates with a mobile station and a management device that manages the mobile station to perform a function of the management device. A line control device that communicates with a mobile station via a radio base station and communicates with a management device that manages location information of the mobile station,
Position information management means for managing the same position information as the position information managed by the management device;
Failure detection means for detecting and recognizing a failure of the management device;
And switching means for switching to use position information managed by the position information management means after recognizing a failure of the management device,
A line control apparatus that performs a location registration process and a connection process for a communication request in place of the function of the management apparatus. The failure detection means includes
A first determination based on the presence or absence of a health check response from the management device;
Performing a second determination based on the number of waiting for a location registration response from the management device,
7. The line control apparatus according to claim 6, wherein a failure of the management apparatus is detected based on the results of the first determination and the second determination.   8. The line control apparatus according to claim 6, wherein the location information management means manages registration information of the mobile station together with the location information. Using a mobile station, a line control device that communicates with the mobile station, and a management device that communicates with the line control device and manages the mobile station,
The mobile communication method, wherein the line control device performs the function of the management device. A line control device for communicating with a mobile station via a radio base station;
A management device that communicates with the line control device and manages location information of the mobile station;
A mobile communication method using
The line control device
A location information registration step of registering the same location information as the location information managed by the management device;
A failure detection step of detecting and recognizing a failure of the management device;
After recognizing a failure of the management device, switching to use the location information managed in the location information management step,
A mobile communication method that performs a location registration process and a connection process for a communication request in place of the function of the management apparatus. In the failure detection step,
A first determination based on the presence or absence of a health check response from the management device;
Performing a second determination based on the number of waiting for a location registration response from the management device,
The mobile communication method according to claim 10, wherein a failure of the management device is detected based on a result of the first determination and the second determination.   12. The mobile communication method according to claim 10, wherein registration information of the mobile station is registered together with the position information in the position information registration step. In the line controller
A program that executes a process acting on behalf of a function of a management device that manages a mobile station. In the line controller that communicates with the mobile station,
Location information registration processing for registering the same location information as the location information managed by the management device;
A failure detection process for detecting and recognizing a failure of the management device;
After recognizing the failure of the management device, switching processing to switch to use the location information managed in the location information management processing,
A program for executing location registration processing and connection processing in response to a communication request on behalf of the function of the management device. In the line control device,
In the failure detection process, a first determination process that is determined based on the presence / absence of a health check response from the management apparatus, and a second determination process that is determined based on the waiting number of location registration responses from the management apparatus And execute
The program according to claim 14, wherein a failure of the management device is detected based on a result of the first determination and the second determination. In the line control device,
The program according to claim 14 or 15, wherein in the position information registration process, a process of registering registration information of the mobile station together with the position information is executed.

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