JP2010041461A - Radio base station device and method for controlling suppression for location registration - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the execution of location registration for a mobile station of a user passing through a cell, and to reduce a quantity of a control signal for the location registration sent to a host network regarding a radio base station device and a method for controlling suppression for the location registration. <P>SOLUTION: When location-registration requirements are received from the mobile station by a radio base station, it is detected whether or not there is a history which has conducted the location registration for the mobile station (2-3), and the location registration is executed instantaneously when there is the history of the location registration (2-7). When there is no history of the location registration, 1 is added to the number of tries of location-registration retry-control information regarding the mobile station (2-4), it is determined whether or not the number of tries reaches a try-number threshold value (2-5) and the location registration is executed when the number of tries reaches the try-number threshold value (2-7). When the number of tries does not reach the try-number threshold value, location-registration requirements emitted this time are nullified (2-6). The location registration is executed to the mobile station having the history of the location registration, or executed to the mobile station which has made position registration requirements prescribed several times. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a radio base station apparatus and a location registration suppression control method. As an example of the radio base station apparatus, a radio base station apparatus (femto radio base station apparatus) constituting a femto cell is included.

  A radio base station apparatus in a mobile communication system is installed to provide a public connection service by a mobile phone service provider, covers a call area (macrocell) with a radius of several hundred m to several tens Km, and is large and expensive. Device. On the other hand, in recent years, it is a small (corresponding to the base unit of a cordless phone) that covers a narrow communication area (femtocell) with a radius of about several tens of meters (femtocell) and has the same functions as a radio base station device, and is inexpensive (level that can be purchased individually ) Femto radio base stations are emerging.

  Femto radio base stations are generally installed to cover the dead zone of radio waves, and are also installed for private use (individual use) and business use (corporate use) of users. Allow. In the future, along with the liberalization of installation of femto radio base stations, it is predicted that the number of location registration requests for mobile stations interposing the installation of femto radio base stations will increase due to the increase in the number of installations and installation environment.

  FIG. 8 shows an outline of the configuration of the mobile communication system. The mobile communication system includes a home register 8-1 that manages subscription contract information of the mobile station 8-7, a mobile switching center 8-2 that provides switching services based on the subscription contract information and location registration information of the mobile station 8-7. , A radio base station control station 8-3 that controls the radio base station 8-4 and the femto radio base station 8-6, a radio base station that establishes a radio zone and controls communication with the mobile station 8-7 by radio 8-4 and a femto radio base station 8-6, which provides a radio communication service to the mobile station 8-7. The radio base station 8-4 covers the radio zone of the macro cell 8-8, and the femto radio base station 8-6 covers the radio zone of the femto cell 8-9.

  The femto radio base station 8-6 and the radio base station control station 8-3 are connected by a network such as a public IP (Internet Protocol) network 8-5. The network 8-5 is, for example, a network of an Internet service provider that provides an Internet access service using a broadband line such as an ADSL (Asymmetric Digital Subscriber Line) or an optical fiber.

  When receiving a call to the mobile station 8-7, it is necessary to make a call from a radio base station that covers a radio zone in which the mobile station 8-7 is located, from among a plurality of radio zones. In the communication system, it is necessary to perform location registration for notifying the location information of the wireless zone in which it is located.

  FIG. 9 shows a location registration processing sequence in the mobile communication system. In the location registration, the mobile station 8-7 sends location registration request information including the mobile station identification number and location information to the radio base station 8-4 (9-1), and the radio base station 8-4 sends the location registration request. Information is sent to the radio base station control station 8-3 (9-2), and the radio base station control station 8-3 sends the location registration request information to the mobile switching center 8-2 (9-3). The exchange 8-2 performs a location registration update process on the home register 8-1 based on the location registration request information (9-4).

  When the location registration update process for the home register 8-1 is completed, the mobile switching center 8-2 sends a notification of successful location registration to the radio base station control station 8-3 (9-5), and the radio base station control station 8 -3 sends a notification of location registration success to the radio base station 8-4 when receiving the notification (9-6), and the radio base station 8-4 receives the notification and succeeds in location registration to the mobile station 8-7. Is sent (9-7).

The location registration process in the mobile communication system is known, for example, from the following patent document.
JP-A-9-18934 JP 2000-78249 A JP-A-11-196252 Japanese Patent Laid-Open No. 8-172626

  In a femto radio base station that covers a busy communication area such as a shopping street or a downtown area, every time a mobile station passes through the communication area, a location registration request is generated from the mobile station, and the femto radio base station There is a possibility that traffic of a control signal for location registration that flows out to a connected network will frequently occur, increasing the processing load on the network. This processing load is proportional to the amount of traffic.

  Location registration when a mobile station passes through a femto cell in a macro cell as shown in FIG. 10 will be described. The location registration processing sequence is shown in FIG. First, when the mobile station 8-7 is located in the macro cell 8-8, location registration according to the sequences 11-1 to 11-7 in FIG. 11 is performed. The location registration by the sequences 11-1 to 11-7 is the same as the location registration processing sequence described with reference to FIG.

  When the mobile station 8-7 moves from the macro cell 8-8 to the femto cell 8-9, the sequence 11-8 to 11- in FIG. 11 is performed via the femto radio base station 8-6 that covers the femto cell 8-9. 14 is registered. The location registration by the sequences 11-8 to 11-14 is the same as the processing sequence of FIG. 9 except that the location registration processing sequence described in FIG. 9 is performed through the femto radio base station.

  Then, when the mobile station 8-7 located in the femtocell 8-9 once moves from the femtocell 8-9 to the original macrocell 8-8, the radio base station that covers the macrocell 8-8 again. The location registration according to the sequences 11-15 to 11-21 in FIG. 11 is performed via 8-4. The location registration by the sequences 11-15 to 11-21 is the same as the location registration processing sequence described in FIG.

  Location registration for a user's mobile station that actually communicates within the femtocell is an indispensable process, but the femtocell that occurs only when the user passes through the femtocell without communicating with the femtocell. Location registration and location registration in the macro cell after passing are useless. This useless location registration causes an invalid control signal to flow out to the network. That amount is enormous for femtocells installed in busy locations.

  The present invention suppresses the execution of location registration in response to a location registration request generated from a user's mobile station that is only temporarily in the cell (femtocell) to pass through the cell (femtocell).

The disclosed radio base station apparatus stores, for each mobile station, the number of retries of location registration request by each mobile station, and the number of retries of the location registration request stored in the storage unit exceeds a predetermined threshold. For location registration requests from mobile stations, location registration processing is performed, and for location registration requests from mobile stations where the number of retries of location registration requests stored in the storage means is equal to or less than a predetermined threshold, location registration is performed. And a control means that does not execute processing.
Also, the disclosed location registration suppression control method includes a first step of storing the number of retries of a location registration request by each mobile station in a memory for each mobile station, and a retry of the location registration request stored by the first step. For a location registration request from a mobile station whose number of times has exceeded a predetermined threshold, a location registration process is performed, and the number of retries of the location registration request stored in the first step is less than or equal to a predetermined threshold. The location registration request from the station includes a second step in which location registration is not executed.

  Since it can restrict | limit so that location registration may be implemented with respect to the mobile station of the user who has been in the cell for a long time and needs a communication service, implementation of location registration can be suppressed. Furthermore, it is possible to reduce the amount of control signal transmitted to the upper network.

  A femtocell will be described as an example of the cell. In addition to femtocells, this does not preclude application for picocells and other cells. First, various information appearing in the following embodiments will be briefly described.

  A mobile station identification number is used here as an example of identification information unique to the mobile station. Based on the mobile station identification number, the mobile station that issued the location registration request is distinguished, and location registration history information and location registration retry control information are generated and stored for each mobile station.

  The location registration history information is data stored and held in the femto radio base station, and is used to determine whether or not there is a past record of location registration for a mobile station from which a location registration request has been issued. . As this location registration history information, a “holding period (for example, number of days)” indicating a period for holding history information, a “list registration count” indicating the number of mobile stations registered in the location registration history list, and a location in the past The “mobile station identification number” for identifying the mobile station that has performed registration and the “time (time stamp)” at which the location registration was successful are stored in the memory.

  A configuration example of the list of location registration history information is shown in FIG. The retention period and a specific mobile station identification number (for example, the mobile station identification number of the femto radio base station owner) can be registered in advance or at any time as location registration history information by the human machine interface. It can be configured. In addition, by setting the time stamp of a specific mobile station identification number (for example, the mobile station identification number of the owner of the femto radio base station) to a specific value, the specific mobile station identification number is stored in the location registration history. The information can be registered indefinitely as information.

  The location registration retry control information is data stored and held in the femto radio base station, and is used for monitoring the number of location registration request tries of each mobile station and controlling the indication of the retry transmission interval of the location registration request. As the location registration retry control information, “traffic information” indicating the number of location registration requests received per unit time (for example, 1 second), “retry transmission interval” indicating the time interval of location registration request retry transmission instructed to the mobile station, "Trial threshold" indicating the threshold of the number of tries to accept the location registration request and permit location registration, "List registration number" indicating the number of mobile stations registered during the retry of the location registration request, and making a location registration request The “mobile station identification number” indicating the identification number for identifying the mobile station and the “trial number” indicating the number of times of the location registration request for each mobile station are stored in the memory.

  A configuration example of the list of location registration retry control information is shown in FIG. Here, “try” means a position registration request that is repeatedly performed including the first position registration request, and “retry” means a position registration request that is repeatedly performed for the second time or later. In the following embodiments, there is no essential difference even if the meaning of “try” is treated in the same way as the meaning of “retry”.

  The “retry transmission interval” and the “threshold number threshold” can be configured to be registered in advance or at any time as location registration retry control information of the femto radio base station by a human-machine interface. As the human machine interface, an input key provided on the femto radio base station device itself, a computer connected to the femto radio base station device, a remote control for the femto radio base station device, or a mobile terminal of a mobile station, etc. It may be configured to register / cancel data by inputting data directly, writing it, or downloading the input data from a dedicated website via an air (wireless) interface or via a network. it can.

Described below is the control for inhibiting the execution of location registration at the femto radio base station.
(First method)
The femto radio base station refers to the location registration retry control information, counts the number of location registration requests for each mobile station in response to the location registration request from each mobile station, and repeats the location registration request a predetermined number of times or more. The location registration request is accepted from the mobile station and the location registration is permitted. In response to a location registration request from a mobile station in which the number of location registration request trials is less than a certain number of times, the location registration request signal is discarded and no location registration control signal is sent to the network.

(Second method)
The femto radio base station instructs the mobile station on the retry transmission interval for location registration using the broadcast information. In order to reduce the impact of processing load on the femto radio base station, this retry transmission interval increases the retry transmission interval as the number of location registration requests (traffic amount) per unit time increases, and location registration per unit time As the number of requests (traffic amount) is smaller, the retry transmission interval is made shorter.

  The second method is taken in order to suppress an increase in signal transmission traffic to a higher-level device even if the number of location registration requests (traffic amount) increases with respect to the femto radio base station. However, for mobile stations that do not have a function to control the retry transmission interval, signal transmission to the host device is performed by the first method for performing location registration when the above-described location registration request is repeated a predetermined number of times or more. An increase in traffic can be suppressed.

(Third method)
In the femto radio base station, the location registration is performed by the first location registration request try for a mobile station having a history of location registration in the past. Whether a mobile station has a history of location registration in the past is determined by referring to location registration history information and whether there is a record of location registration within a certain period (for example, one week).

  The maintenance of location registration history information related to the performance of location registration in the third method uses the time (time stamp) at which location registration was successful and the information on the retention period, and the time at which location registration was successful (time stamp). It is periodically checked whether the value obtained by adding the retention period value to the current time value exceeds the current time value, and if it exceeds, the mobile station identification number is deleted from the list.

  Next, the relationship between the traffic volume and the retry transmission interval will be described. When the number of location registration requests (traffic amount) per unit time is large, if the location registration is performed in the normal time in response to the location registration request, the amount of signal flowing out to the network (higher level device) increases. Accordingly, by instructing to increase the retry transmission interval of the location registration request issued from the mobile station, the implementation of location registration per unit time is suppressed, and the amount of signal flowing out to the network (higher level device) can be reduced. it can.

  Also, if the number of location registration requests per unit time (traffic volume) is small, even if location registration is performed as it is for a location registration request retry that occurs in a short period of time, it will flow out to the network (higher level device). The amount of signal is small. Therefore, it is possible to improve the convenience for the user by instructing to shorten the retry transmission interval of the location registration request issued from the mobile station and promptly performing the location registration.

Next, the retry transmission interval will be described.
(Control by femto radio base station)
Retry transmission interval information is included in notification information to the mobile station when the femto radio base station is ready to start operation. In addition, the amount of traffic from the mobile station is measured and updated periodically (cycle), and the retry transmission interval is determined and updated periodically (cycle) based on this traffic volume. Then, the broadcast information of the retry transmission interval is updated and transmitted to the mobile station.

(Control by mobile station)
When the mobile station that has received the retry transmission interval broadcast information from the femto radio base station performs the location registration request retry, the mobile station waits for the elapsed retry transmission interval to retry the next location registration request. .

(Signal format of broadcast information to mobile stations)
As broadcast information to be broadcast from the femto radio base station to the mobile station, a retry transmission interval parameter is added in addition to the conventional broadcast parameters. FIG. 1C shows an example of the signal format of broadcast information to which a retry transmission interval parameter is added.

  Next, a control flow for suppressing the execution of location registration will be described. FIG. 2 shows a control flow of the signal processing system for realizing location registration suppression control at the femto radio base station. FIG. 3 shows a control flow of the periodic processing system for realizing location registration suppression control at the femto radio base station.

  As shown in FIG. 2, the control flow of the signal processing system for realizing the location registration inhibition control receives a signal at the femto radio base station (2-1), and determines the type of the signal (2-2). If the signal is a location registration request signal, it is determined whether or not there is a history of location registration in the location registration history information for the mobile station that issued the location registration request (2-3). .

  If there is a history of location registration in the past, location registration is performed immediately (2-7). If there is no history of location registration in the past, 1 is added to the number of tries in the location registration retry control information for the mobile station that issued the location registration request. If there is a location registration request from a mobile station that is not registered in the location registration retry control information, the mobile station is registered in the location registration retry control information as the number of tries 1 (2-4).

  Next, it is determined whether or not the number of tries in the position registration retry control information has reached the threshold for the number of tries (2-5). When the number of trials reaches the threshold for the number of trials, location registration is performed (2-7). If the number of trials has not reached the threshold for the number of trials, the location registration request signal issued this time is discarded (2-6).

  If the received signal type is a location registration success signal, the femto radio base station performs existing processing (2-8), and registers the performance of the current location registration as location registration history information. (2-9). Then, the entry information of the number of tries of the mobile station is deleted from the location registration retry control information (2-10). In FIG. 2, a flow surrounded by a broken line is a control flow newly added for controlling the location registration suppression.

  As shown in FIG. 3, the control flow of the periodic processing system for realizing the location registration suppression control is such that when an event is periodically started in the femto radio base station and an event occurrence signal is received (3-1), The type is determined (3-2), and when the event is the first periodic event, the traffic amount of the location registration request per unit time (for example, 1 second) is measured and updated (3-3).

  When the event is the second periodic event, the retry transmission interval of the location registration retry control information is updated from the traffic amount information (3-4). Then, it is determined whether or not there is a change in the retry transmission interval (3-5), and when there is a change in the retry transmission interval, a change in the parameter of the retry transmission interval of the broadcast information is requested (3-6). .

  In this retry transmission interval control, the amount of traffic is compared with one or a plurality of threshold values, and the retry transmission interval is lengthened as the traffic amount increases, and the retry transmission interval is shortened as the traffic amount decreases.

  If the event is a third periodic event, the threshold for the number of tries in the location registration retry control information is updated from the traffic information (3-7). In the control of the threshold for the number of trials, the traffic amount is compared with one or a plurality of thresholds, and the threshold for the number of trials is increased as the amount of traffic increases, and the threshold for the number of tries is decreased as the amount of traffic decreases.

  If the event is a fourth periodic event, the entry information of the location registration history that has passed the holding period is deleted from the location registration history information based on the holding period of the location registration history information (3-8). In the control flow of these periodic processing systems, since the control flow of each periodic processing can be executed in an independent period, the periodic event of each periodic processing system can be different.

  In the example of the control flow in FIG. 3, the example of controlling the retry transmission interval and the threshold for the number of trials based on the information on the traffic amount of the measured location registration request is shown. However, the location registration request according to the day of the week or the time zone is shown. Based on the average traffic volume per unit time, the retry transmission interval is lengthened on the day of the week or time period when the traffic volume is large, and the retry transmission interval of the location registration request is shortened on the day or time period when the traffic volume is small. It can be set as the structure controlled to do.

  Similarly, the trie threshold value is controlled so that the value of the trie threshold value is increased on a day of the week or time period with a large traffic volume, and the value of the trie threshold value is decreased on a day of the week or time period with a low traffic volume. be able to.

  An operation example when the mobile station passes through the femtocell will be described with reference to FIGS. In this operation example, the threshold for the number of tries (that is, the threshold for the number of location registration requests) is set to twice. FIG. 4 shows a mode in which the mobile station 8-7 passes through the femtocell 8-9 covered by the femto radio base station 8-6. Note that the femtocell 8-9 is surrounded by the macrocell. In addition, the femto radio base station 8-6 transmits the location registration information to the upper radio base station control device via the network (for example, IP network) 8-5.

  FIG. 5 shows the relationship between the field strength of the femtocell and the macrocell. (A) of the figure shows the electric field strength of the femto cell, and (b) shows the electric field strength of the macro cell. In the figure, the horizontal axis indicates the location (location) in the call area, and the vertical axis indicates the electric field strength. When the mobile station passes a point where the electric field strength (a) of the femtocell exceeds the electric field strength (b) of the macrocell, a location registration request from the macrocell to the femtocell is issued from the mobile station. Further, when the mobile station passes a point where the electric field strength (a) of the femtocell is smaller than the electric field strength (b) of the macrocell, a location registration request from the femtocell to the macrocell is issued from the mobile station.

  The processing sequence of this operation example is shown in FIGS. When the mobile station 8-7 is located in the macro cell 8-8, the location registration by the sequences 6-1 to 6-7 in FIG. 6 is performed via the radio base station 8-4. The location registration by the sequences 6-1 to 6-7 is the same as the location registration processing sequence described with reference to FIG.

  The femto radio base station 8-6 constantly transmits a radio wave of broadcast information including information on the retry transmission interval of the location registration request to the mobile station 8-7 (6-8 in FIG. 6, ( I)). When the mobile station 8-7 enters the femtocell 8-9 and the mobile station 8-7 detects a radio wave from the femtocell radio base station 8-6, a signal for requesting location registration is sent to the femto radio base station 8-6. (Refer to 7-1 in FIG. 7 and (II) in FIG. 4).

  The femto radio base station 8-6 searches the location registration history information based on the mobile station identification number of the mobile station 8-7, determines the presence / absence of location registration results, and performs the following control. If the mobile station has been registered in the past as location registration history information, location registration is performed on the mobile station (see 7-2 to 7-7 in FIG. 7).

  For mobile stations that have not been registered for location registration in the past, search for location registration retry control information based on the mobile station identification number, and count the number of location registration request trials from the mobile station. Compare with the number threshold. In this case, since the number of tries is 1 (because it is the first time) and is not greater than the threshold value of the number of tries 2, this location registration request signal is discarded (see 7-8 in FIG. 7), and the next location registration from the mobile station 8-7. Wait for request retry (see (III) in FIG. 4).

  Since there is no response from the femto radio base station 8-6 in response to the location registration request, the mobile station 8-7 has passed the retry transmission interval time instructed from the femto radio base station 8-6 after the response wait timed out The location registration request is retried later (see 7-9 in FIG. 7 and (IV) in FIG. 4).

  The femto radio base station 8-6 searches the location registration retry control information based on the mobile station identification number, counts the number of tries in the location registration request from the mobile station, compares it with the threshold for the number of trials, Therefore, the location registration request is accepted and location registration is performed (see 7-10 to 7-15 in FIG. 7 and (V) in FIG. 4).

  When the location registration is successful, the mobile station identification number of the mobile station is registered in the memory together with the time stamp so that the location registration history information stores information on the record of the successful location registration of the mobile station for a certain period. Further, the registration information of the number of tries of the mobile station is deleted from the location registration retry control information.

  When the mobile station 8-7, whose location is registered via the femtocell radio base station 8-6, moves out of the femtocell area, the radio base station 8-4 covering the macro cell covering the periphery of the mobile station 8-7 6 is registered in the sequence 6-9 to 6-15. The location registration by the sequences 6-9 to 6-15 is the same as the location registration processing sequence described in FIG. In addition, for the mobile station 8-7 that has not been subjected to the location registration by the femtocell radio base station 8-6, the location registration in the macro cell by the sequences 6-9 to 6-15 is not performed.

  By the above control sequence, the mobile station has been in the femtocell for a long time and repeats location registration requests more than a predetermined number of times, or only for mobile stations that have a history of location registration within a predetermined period of time. Registration is performed, and location registration is not performed for mobile stations that are temporarily located for a short time only after passing through the femtocell, and location registration can be suppressed.

  While a mobile station is retrying a location registration request at a femtocell, it cannot receive a communication service at that femtocell, but via a radio base station that covers the macrocell that was originally located. Since communication is possible, there is no problem in terms of service.

  In addition, there is a concern that the number of control signals due to the retry increases by causing the mobile station to retry the location registration request up to a predetermined number of times, which increases the processing load of the femto radio base station. In many cases, the mobile station of a user who has been in the area moves out of the femtocell area before the start of the location registration request retry, and since the femtocell is originally a small area, the mobile station is in that area. The number of mobile stations does not increase that much.

  Therefore, even if the mobile station is retried a location registration request up to a predetermined number of times, there is no excessive burden on the femto radio base station. However, in order to suppress the increase in the number of control signals due to retries as much as possible, for a mobile station that has a history of location registration in the past, by performing location registration with a single location registration request, the control signal An increase in the number can be suppressed.

It is a figure which shows the structural example of the signal format of the list | wrist of position registration history information, the list | wrist of position registration retry control information, and alerting | reporting information. It is a figure which shows the control flow of the signal processing system of position registration suppression control. It is a figure which shows the control flow of the periodic processing system of position registration suppression control. It is a figure which shows the aspect through which a mobile station passes a femtocell. It is a figure which shows the relationship between the electric field strength of a femtocell and a macrocell. It is a figure which shows the processing sequence (the 1) of a location registration when a mobile station passes the femtocell in a macrocell. It is a figure which shows the processing sequence (the 2) of a location registration when a mobile station passes the femtocell in a macrocell. It is a figure which shows the outline | summary of a structure of a mobile communication system. It is a figure which shows the process sequence of the position registration in a mobile communication system. It is explanatory drawing of a position registration when a mobile station passes the femtocell in a macrocell. It is a figure which shows the processing sequence of the conventional location registration when a mobile station passes the femtocell in a macrocell.

Explanation of symbols

8-1 Home register 8-2 Mobile switching center 8-3 Radio base station control station 8-4 Radio base station 8-5 Network 8-6 Femto radio base station 8-7 Mobile station 8-8 Macro cell 8-9 Femto cell

Claims (5)

Storage means for storing the number of retries of location registration request by each mobile station for each mobile station;
For a location registration request from a mobile station in which the number of retries of the location registration request stored in the storage means exceeds a predetermined threshold, a location registration process is performed, and the location registration request stored in the storage means For a location registration request from a mobile station whose number of retries is less than or equal to a predetermined threshold, control means that does not execute location registration processing;
A radio base station apparatus comprising: Comprising history information storage means for storing a mobile station that has performed location registration;
When the control means receives a location registration request from the mobile station, the control means searches the location registration history information stored and held in the history information storage means, and receives a location registration request from the mobile station in which the location registration history is stored. The radio base station apparatus according to claim 1, wherein the location registration processing is performed even when the number of retries of the location registration request is less than the threshold. The amount of traffic per unit time of a location registration request from a mobile station is measured, the traffic amount is compared with one or a plurality of thresholds, and the larger the traffic amount, the more the location registration request from each mobile station is retried. Means for sending broadcast information instructing the mobile station to shorten the retry transmission interval of the location registration request from each mobile station as the transmission interval is lengthened and the traffic volume is small;
Or the means for controlling the threshold value to increase the threshold value as the traffic volume increases, and to decrease the threshold value as the traffic volume decreases;
The radio base station apparatus according to claim 1, further comprising: Based on the average traffic volume per unit time of the location registration request according to the day of the week or the time zone, the retry transmission interval of the location registration request from each mobile station is lengthened on the day of the week or the time zone when the traffic volume is large. Means for sending notification information for instructing the mobile station to shorten a retry transmission interval of a location registration request issued from each mobile station on a day of the week or a time zone with a small amount of traffic;
Or means for controlling the threshold value so as to increase the value of the threshold value on a day of the week or time period with a large amount of traffic and to decrease the value of the threshold value on a day of the week or time period with a small amount of traffic.
The radio base station apparatus according to claim 1, further comprising: In the location registration suppression control method in the radio base station,
A first step of storing the number of retries of a location registration request by each mobile station in a memory for each mobile station;
For the location registration request from the mobile station in which the number of retries of the location registration request stored in the first step exceeds a predetermined threshold, the location registration processing is performed, and the location registration request is stored in the first step. For a location registration request from a mobile station in which the number of retries of the location registration request is not more than a predetermined threshold, a second step that does not execute location registration;
A location registration deterrence control method comprising:

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