JP2649294B2 - Location registration method in mobile communication network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to mobile communications, and more particularly to a location registration system in a mobile communications network having a location registration area much smaller than that of a conventional car telephone or the like.

[0002]

2. Description of the Related Art Mobile communications are communications for mobile objects such as people, automobiles, ships, and airplanes. At present, services such as car phones, coastal marine phones, aircraft phones, and train public phones are mainly used. Is provided.

[0003] The automobile telephone has a capacity of about 100,000 subscribers per area, and a small zone configuration system capable of providing nationwide service has been developed. The service has been started in Tokyo since 1979, and thereafter, in major cities. Was also introduced. And then
A system for small and medium-sized cities has been developed, and services have been gradually expanded nationwide. In the mobile telephone system having the small zone configuration, a radio base station is provided for each zone, a plurality of radio line control stations accommodating the plurality of radio base stations as its higher station, and the plurality of radio circuit controllers as its higher station. A plurality of mobile telephone exchanges accommodating the above wireless circuit control stations are provided, and the plurality of mobile telephone exchanges are connected to a telephone network so that telephone calls can be made with general telephones nationwide. The zone covered by the radio base station of the car phone is relatively wide (for example, 2 to 3 km in diameter), and the location registration area is also wide on a per-prefecture basis, assuming the tracking connection of a terminal (car phone) moving at high speed. Communication network. The location registration area is a unit area obtained by dividing a service area into an appropriate size and identifying the location of a mobile subscriber, and prevents an invalid call to an absent area when receiving a call to the mobile subscriber. Therefore, it is an area provided for making a call based on the latest location of the called mobile subscriber.

Meanwhile, as a future mobile communication service, a personal communication service, which is a simpler mobile communication system based on an individual (personal number), is attracting attention, and development for realizing the service is active. It has become to. This personal communication can be called a next-generation mobile phone service, and is intended for low-speed moving objects such as walking (for example, humans). By making it narrower (for example, 100 to 200 m in diameter) and the location registration area to several kilometers in diameter, it is possible to reduce the size of communication terminals, effectively use radio frequencies, and reduce network costs, etc. The aim is to provide services that are much cheaper than telecommunications services and increase their spread.

[0005] FIG. 7 shows a location registration method in a conventional mobile communication service. FIG. 7 is a flowchart illustrating a location registration process performed by a location registration processing unit of a conventional mobile communication terminal.

Conventionally, when a power supply of a mobile communication terminal is first turned on (power-on), position information (information indicating the latest registered position registration area) previously stored in an internal memory is extracted and recorded. The position information is compared with the position information transmitted from the wireless base station to determine whether the position information has changed, that is, whether the position information has crossed the position registration area (S2 to S3). If there is, a location registration signal including its own mobile terminal identification number,
After transmitting to the wireless base station in the zone in which the mobile terminal is accommodated (S4), the location information stored in the internal memory is
The current position information is internally set by rewriting the position information received from the wireless base station in the above process S2 (S5).

[0007]

As described above, conventionally, when the location registration area changes due to movement, a location registration signal is unconditionally transmitted to the radio base station. This method, like the current car phone service,
In services where the location registration area is wide, such as by prefecture, and mobile terminals (car phones, etc.) move infrequently beyond the location registration area, location registration signals are not frequently transmitted, and a particular problem occurs. I didn't.

[0008] However, in the personal communication service, for example, when a person carrying a mobile phone gets on a relatively high-speed moving body such as a car or a train and moves, communication (outgoing / incoming connection and talking) is performed. Despite being in a state where it is not possible, a location registration signal is frequently sent from the mobile phone (for example, every time the mobile phone moves 100m to 200m),
There is a risk of network congestion.

[0009] As a countermeasure against the above-mentioned problem, when a mobile phone holder moves on a high-speed moving body such as a car or a train, the power of the mobile phone is turned off. It is conceivable to ask them to do it,
This is bothersome to the user and poor in reliability (high probability of forgetting), so it is not a good solution. Therefore, there is an urgent need to establish a method for automatically and efficiently transmitting a location registration signal without causing network congestion as described above.

An object of the present invention is to prevent network congestion due to abnormal occurrence of location registration signals in mobile communication having a very small location registration area, such as personal communication, and reduce the call processing performance of the network. It is another object of the present invention to realize a location registration method capable of efficiently performing location registration in a network database.

[0011]

FIG. 1 is a diagram illustrating the principle of the present invention. According to the present invention, for all mobile communication devices (mobile terminals) subscribing to the network, the devices have a database that stores a location registration area (location registration unit area) to which the device currently belongs, Each mobile communication device
When the location registration area to which the self belongs belongs changes due to movement, the location registration area to which the self belongs belongs is notified to the network by transmitting a location registration signal, and the network receives the location registration signal and receives the location registration area. It is assumed that a location registration method in a mobile communication network rewrites location information of a mobile communication device that has transmitted a registration signal to a location registration area notified by the location registration signal.

Note that the location registration area is defined as an area for simultaneously calling the called party's mobile communication device at the time of incoming connection, and is an area including a plurality of communication zones. And it is also called a paging area.

The position change detecting means 1 is, for example, a change in a radio wave transmitted from a radio base station (BS) unique to each location registration unit area (for example, a change in a radio wave having the highest reception level).
To detect a change in the location registration area to which the own device changes with movement.

The storage means 2 is composed of, for example, a semiconductor memory which is backed up by a power supply, and stores the change detection time of the position registration area detected by the position change detection means 1 up to N times before. Note that N is an arbitrary positive integer of 1 or more.

Timer 3 is an interval timer (Interval
Timer) and the like, which counts a predetermined time. When the counting of the predetermined time is completed (expired), the completion of the counting is notified by an interrupt or the like.

The calculating means 4 stops the timekeeping operation of the timer 3 every time the change of the position registration area to which the own device belongs is detected by the position change detecting means 1, and the current time is stored in the storage means 2. The time difference tt from the position registration area change detection time N times before is calculated, and the current time is newly stored in the storage means 2 and the change detection time of the position registration area N times before is deleted.

The signal transmission determining means 5 determines whether or not the time difference tt calculated by the calculating means 4 is equal to or longer than a predetermined time T1. , By sending a location registration signal to the network (for example, the wireless base station in the zone where the device is currently accommodated), and if the time is less than the predetermined time T1, the timer 3 measures the predetermined time T2. To start.

The signal transmitting means 6 receives a notification of the expiration of the predetermined time T2 from the timer 3 by interruption or the like, and changes the location registration area to which the own device belongs to by transmitting a location registration signal to the network (for example, Notify the wireless base station of the currently accommodated zone).

The location registration signal is a control signal transmitted on a predetermined control channel, for example, and includes an identification number (for example, a personal number) assigned to the own device in advance.

[0020]

According to the present invention, the mobile communication device moves,
When the position registration area to which the device belongs changes, the change is detected by the position change detecting means 1. This detection time is stored in the storage unit 2 by the calculation unit 4 up to N times before. Each time the position change detection unit 1 detects a change in the position registration area, the calculation unit 4 calculates the current time and the change detection time of the position registration area N times before stored in the storage unit 2. Tt is calculated. Subsequently, the signal transmission discriminating means 5 is activated, and if the time difference tt is equal to or longer than the predetermined time T1, the signal transmission discriminating means 5 transmits a location registration signal to the network, and the location registration area to which the own device currently belongs. To the network. On the other hand, if the time difference tt is less than the predetermined time T1, the signal transmission determining means 5 does not transmit the position registration signal and causes the timer 3 to start measuring the predetermined time T2.
Then, if the position change detecting means 1 does not detect a change in the position registration area while the timer 3 is counting the predetermined time T2, the timer 3 notifies the signal transmitting means 6 of the expiration of the timer. In response to this notification, the signal transmitting means 6 transmits the location registration signal to the network in response to the notification, and notifies the network of the location registration area to which the own device currently belongs. On the other hand, if the position change detecting means 1 detects a change in the position registration area while the timer 3 is counting the predetermined time T2, the calculating means 4
, The signal transmission means 6 does not transmit the position registration signal.

Therefore, by the above processing, the predetermined time T2
When the number of changes in the location registration area frequently occurs below the range, transmission of the location registration signal is suppressed. Then, when a change in the location registration area occurs after a lapse of the predetermined time T2 or more, a location registration signal is transmitted from the signal transmission means 6 by the above processing. Further, when a change in the location registration area constantly occurs at a time interval equal to or longer than the predetermined time T1, a location registration signal is transmitted to the network every time the location registration area is changed by the above processing.

In this way, the transmission frequency of the location registration signal transmitted from the mobile terminal device to the network is always kept below a certain value.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a part of the entire configuration of a personal communication network to which an embodiment of the present invention is applied.

In FIG. 1, communication zones (zones) A,
B,..., Z, a, b,.
It is an area of a shape such as a circle, an equilateral triangle, a regular quadrangle, or a regular hexagon of up to 100 m, and the communication zones A, B,.
.. At the center of Z, a, b,.
S: Base Station) 20A, 20B, ... 20Z, 2
0a, 20b,... 20z are provided. These radio base stations (BS) 20A-20Z, 20a-20z
Performs communication control such as outgoing / incoming connection and communication between the mobile terminals 30 in the communication zones AZ, az managed by the own station.

The communication zones A to Z constitute one location registration unit area (paging area) # α, and the communication zones a to z also constitute one location registration unit area (paging area). # Β. And
Unique position information (area identification code) is assigned to these position registration unit areas in advance, and the radio base station (BS) belonging to each position registration area stores the position information in a communication zone managed by its own station. It is sent to all areas regularly.

Further, a radio control station 30 accommodating all the radio base stations (BS) in the location registration unit area is provided for each location registration unit area. The plurality of radio control stations 30 are accommodated in an exchange 40, and the plurality of exchanges 40 are connected to a common channel signaling network 50 that performs communication using a predetermined common channel signaling system. The common line signaling network 50 is connected to a subscriber information database 60 in which position information of each subscriber (owner of the mobile terminal 30) is registered.

The subscriber information database 60 stores a personal number of each subscriber (owner of the mobile terminal 30) and its current location information (area identification code) in one-to-one correspondence. When a personal number is dialed from a general telephone, the fixed telephone network accesses the subscriber information database 60 through the common channel signaling network 50,
Based on the location information corresponding to the personal number, the exchange 4
0, the mobile terminal 30 of the subscriber to which the personal number is assigned via the radio control station 30 and the radio base station 20
Make a call to.

The configuration shown in FIG. 2 is a part of a personal communication network, and actually includes a larger number of location registration unit areas, communication zones, radio base stations (BS) 20, radio control stations 30, and exchanges 40. Is provided.

Next, FIG. 3 shows a block configuration of the location registration processing unit 31 in the mobile terminal 30 which is a main part according to the present invention. As shown in the figure, the position registration processing unit 31 includes a position registration control unit 31a, a position registration signal transmission determination unit 31b, and an interval timer unit 31c.

The location registration control unit 31 a
Constantly monitors the change in the location registration unit area in which the mobile station 30 is accommodated, and if there is a change, sends a location registration signal including the personal number of the own mobile terminal 30 to the radio base station (BS) of the communication zone in which the mobile station 30 is accommodated. 20 (send).

The location registration signal transmission determination section 31b is started by input of a location registration determination request added from the location registration control section 31a, and, as will be described later in detail, based on the transmission frequency of the location registration signal. It is determined whether or not the location registration signal should be transmitted when the location registration unit area 30 changes, and when it is determined that the location registration signal should be transmitted, a registration transmission instruction request is output to the location registration control unit 31a. As described above, the position registration signal transmission determining unit 31b has a function of preventing the position registration signal from being transmitted (transmitted) at a predetermined frequency or more.

The interval timer section 31c is a timer used by the position registration signal transmission determining section 31b to determine the frequency of transmitting the position registration signal, and operates in response to a timer start request added from the position registration signal transmission determining section 31b. Is started, and the timer operation is stopped in response to the timer stop request added from the position registration signal transmission determination unit 31b.
Further, when a predetermined time (T2) or more elapses after the timer is activated by the timer activation request, the timer notifies the position registration signal transmission determination unit 31b of the expiration of the timer.

Next, the transmission (transmission) control operation of the position registration signal performed by the position registration processing section 31 having the above configuration will be described with reference to the flowchart of FIG. First, the system constants N, T1, and T2 used in the flowchart of FIG. N: Permissible limit value of the number of consecutive executions of location registration (location registration signal transmission). For example, when N = 2, the number of location registration signals transmitted during the unit time (T1) is allowed up to two times. However, if a transmission request occurs three or more times, the transmission of the location registration signal is suspended. This system constant N
For example, the frequency of the position registration signal generated when a person holding the mobile terminal 30 is riding on a high-speed moving object such as a car or a train (when N = 2, the unit time (T1)
(Three or more times in a row) during transmission, and the person holding the mobile terminal 30 accidentally walks near the boundary between the two location registration unit areas while walking. It is used to allow up to N consecutive requests for location registration signal transmission when they occur at very short time intervals. T1... Indicates a unit time used for counting the allowable number N of continuous transmission (transmission). T2: A timer value that defines a time interval from when the position registration processing (position registration signal transmission processing) is skipped due to the above-described regulation until transmission of the position registration signal is restarted. If a position registration request is issued again before the timer value (timer time) T2 expires, the timer clock of the interval timer unit 31c is reset to the timer value (timer time) T2 at that time. If the position registration request is not issued again until the time T2 elapses from the reset point, the position registration signal is transmitted when the time T2 elapses.

By the way, all radio base stations (B
S) 20 continuously transmits the unique radio wave (position information) assigned to the position registration unit area to which the mobile terminal 30 belongs to the mobile terminal 30 by radio. That is, all the radio base stations (BS) 20 in the same location registration unit area
The same radio wave (position information) is transmitted.

The receiving section of the mobile terminal 30 always receives the above radio waves while the power is on (power on), and the position registration processing section 31 constantly monitors the received radio waves. By detecting the change in the radio wave, it is determined that the terminal 30 has moved to another location registration unit area, and the stored location information is rewritten. During power-off (power-off), the position information signal is not monitored, but the radio wave information (position information) stored until immediately before power-off is kept.

Next, the description will proceed to the flowchart shown in FIG. When the mobile terminal 30 is powered on (power-on), the location registration processing unit 31a extracts the location information stored immediately before the power off (S11), and retrieves the location information received from the radio base station (BS) 20. The change is monitored (S12).

Then, a change in the received position information is detected,
That is, when detecting that the own terminal 30 has moved to another location registration unit area, the location information stored in the internal memory is updated to the newly received location information (S1).
3) A “location registration determination request” is transmitted to the location registration signal transmission determination unit 31b (S14 → S21).

The position registration signal transmission determination unit 31b holds the history of the "position registration request" received from the position registration processing unit 31a up to N times before. The history also stores the time at which the “location registration determination request” was received.

Then, the position registration signal transmission determining section 31b
When the "position registration request" is received, if the interval timer unit 31c is running, it sends a "timer stop request" to the interval timer unit 31c to stop the interval timer unit 31c (S22). Subsequently, the current time is read from an internal real-time clock (R-eal Time Clock), not shown, and the time N times before (the reception time of the “position registration determination request” N times before) from the history information is read out. And calculates a time difference (tt) between the current time and the time N times before (S)
23). Then, the history information is updated (the (N-1) th time is set to the Nth time, the (N-2) th time is set to the (N-1) th time, and so on. An update is performed to advance the time, and finally the current time is set to the first time) (S24).

Subsequently, it is determined whether or not the time difference (tt) obtained in the above step S23 is smaller than the predetermined time T1 (S23).
25) If it is equal to or longer than the predetermined time T1, a "registration transmission instruction request" is transmitted to the position registration processing unit 31a (S2).
6 → S15).

Upon receiving the "registration sending instruction request", the location registration processing section 31a transmits a location registration signal including the personal number of the subscriber of the own terminal 30 by radio wave to the communication in which the own terminal 30 is currently accommodated. Zone radio base station (BS) 2
0 (S16).

According to the above operation, when the location registration control unit 31a detects a change in the location registration unit area with a time difference (tt) equal to or longer than the predetermined time T1, the location registration signal is transmitted to the radio base station (BS) 20 by radio. It is transmitted by radio waves.

On the other hand, if the time difference (tt) is smaller than the predetermined time T1 in the determination processing S25, the timer value (timer time) is supplied to the interval timer unit 31c stopped in the processing S22. A “timer start request” having T2 as a parameter is transmitted, and the interval timer unit 31c is started (S27).

Upon receiving the "timer start request" having the timer value T2 as a parameter, the interval timer unit 31c sends a "timer request" to the position registration signal transmission determining unit 31b after the time indicated by the timer value T2. "Expiration". Upon receiving the "timer expiration", the position registration signal transmission determining unit 31b transmits a "registration transmission instruction request" to the position registration processing unit 31a in the process S26, and the position registration processing unit 31 receives the "registration expiration request". , Own terminal 3
A location registration signal including the personal number of the subscriber No. 0 is transmitted to the wireless base station (BS) of the communication zone in which the terminal 30 is currently accommodated by radio waves (S16).

By the above operation, when the position registration control unit 31a detects a change in the position registration unit area at a time interval shorter than the fixed time T1, the position registration control unit 31a
Although the location registration signal is not transmitted to the radio base station (BS) 20, if a change in the location registration unit area is not detected even after a certain time T2 has elapsed, the location registration signal is transmitted to the radio base station (BS). Transmit the location registration signal.

The interval timer unit 31c
However, if the “location registration determination request” is transmitted from the location registration processing unit 31a to the location registration signal transmission determination unit 31b before the timer value T2 is counted, the location registration signal transmission determination unit 31 Transmits a "timer stop request" to the interval timer unit 31c in the above-described step S22, and then executes (T) in steps S23 to S25 to S27.
1> T2), the interval timer 31c is again clocked by the timer value T2. Although the position registration signal transmission determination unit 31b receives the “position registration determination request” from the position registration signal unit 31a, the position registration control unit 31
For example, a situation in which the “registration transmission instruction request” is not transmitted to the mobile terminal 30a is that the mobile terminal 30 frequently moves between the location registration unit areas (for example, when the owner of the mobile terminal 30 Etc. while moving on a high-speed moving object).

By the above operation, while the position registration processing unit 31a continues to detect a change in the position registration unit area at a time interval shorter than the fixed time T1, the position registration processing unit 31a
The location registration signal is not transmitted to the radio base station (BS). Therefore, even if the person holding the mobile terminal 30 moves on a high-speed moving body such as a train or an automobile while the power is turned on (power off), the position registration signal is frequently transmitted. There is no.

Next, the above constants are set as N = 2, T1 = 11 minutes, T
An example of the position registration signal transmission operation performed by the processing shown in the flowchart of FIG. 4 when 2 = 6 minutes will be described with reference to FIG.

In the figure, the time indicated by △ (triangle mark) is the time at which the position registration processing section 31a detects a change in the position registration unit area, and ● (black circle) and × (cross mark) indicate
This indicates that the location registration processing unit 31a has performed or failed to transmit the location registration signal to the radio base station (BS) 20.

As shown in the figure, when Mr. A carrying the mobile terminal 30 is walking at 4 to 5 km / h, the location registration unit area has a circular shape with a diameter of 2 to 3 km. Therefore, the location registration signal is transmitted to the radio base station (BS) 20 at intervals of about 30 minutes.

Next, when Mr. A waits for the train at the station and gets on the train at 50 km / h, the location registration unit area changes at approximately 4 minute intervals. In this case, the first and second location registration units are changed. Each change of area is detected for 80 minutes (tt
1), since it is performed with a time difference tt (> T1) of 53 minutes (tt2), the position registration signal is transmitted for each detection by the radio base station (BS).
20. After that, if the train runs while stopping for 1 minute every 8 minutes, a change in the location registration unit area is detected every 4 minutes or 5 minutes thereafter. The time difference tt from the position registration unit area detection time is 8 minutes (tt3, tt6, tt9) or 9 minutes (tt4, tt5, tt7, tt8) and T1 (= 11 minutes).
Therefore, no location registration signal is transmitted.

[0052] Subsequently, and have lunch at the restaurant Mr. A to get off the train, 6 minutes from the position change detection time t ₁₁ shown in FIG. 5 (= T2) after the lapse, interval timer unit 31
The notification of the expiration of the timer is sent from the location registration signal transmission determination unit 31
b, the registration signal processing unit 31a transmits a location registration signal to the radio base station (BS) 20.

Thereafter, when Mr. A leaves the restaurant and starts walking again at a speed of 4 to 5 km / h, the diameter of the position registration unit area is 2 to 3 km. A change is detected (at time t ₁₃ shown in FIG. 5,
t see _15), each detection, the radio base station (BS) 2
A position registration signal is transmitted for 0.

Also, while Mr. A is walking, as shown schematically in FIG. 6 (in FIG. 6, the bold line indicates the trajectory of Mr. A), the edge of the location registration unit area happens to happen. In the example shown in FIG. 6, when detecting the change of the location registration unit area,
In this case, location registration is performed unless such a situation occurs continuously N times or more (when N times or more, it is assumed that the user is riding on a high-speed moving object such as a train). Since the transmission of the signal is not suppressed, the transmission of the position registration signal does not needlessly be suppressed in the situation where the communication as shown in FIG. 6 is possible (for example, while walking).

In personal communication, since the communication zone is very narrow, 100 to 200 m in diameter, as compared with the conventional mobile communication service, a person carrying the mobile terminal 30 can use a high-speed mobile object such as a train or an automobile. In the case where the user travels with a, the communication zone is frequently switched (occurs every few seconds), so that it is difficult to guarantee the communication. In such a case, the service is excluded in advance. However, in spite of this, in the conventional location registration method, unless the power of the mobile terminal 30 is turned off, the location registration signal is transmitted unconditionally every time the location registration unit area changes. There is a risk of congestion.

In the present embodiment, the maximum N
Since the location registration signal is regulated to be transmitted only up to twice (in the example shown in FIG. 5), such a situation that causes network congestion can be avoided. Also,
If the change in the location registration unit area occurs at a time interval shorter than the timer expiration time T2 because the person carrying the mobile terminal 30 happens to be walking by chance near the proximity of the location registration unit area, In the embodiment, N times (two times in the example shown in FIG. 5) are allowed continuously during the timer time T1, so that in a situation where communication is possible, such as during walking, the position change is detected by chance as described above. Is set to an appropriate value, the transmission of the location registration signal is not unnecessarily suppressed, and at the same time, the signal is not excessively transmitted. In addition, it is possible to enhance the convenience of the subscriber (user) and prevent trouble in network communication.

It should be noted that the values of N, T1, and T2 shown in FIG. 5 are merely examples, and may vary depending on network performance conditions (position registration signal processing capability, etc.), serviceability, speed characteristics of a mobile unit, and the like. , An optimal value may be selected. Also,
The values of N, T1, and T2 may be arbitrarily set by the user.

[0058]

According to the present invention, a mobile communication device (mobile terminal) automatically transmits a location registration signal to a network when a change in a location registration area to which the own device belongs occurs more frequently than a predetermined frequency. In a mobile communication network with a very small location registration area such as personal communication (personal mobile communication), the owner of a mobile communication device moves on a high-speed mobile object. It is possible to prevent the occurrence of unforeseen abnormal situations such as congestion of the network due to abnormal occurrence of location registration signals in situations other than the service target, without reducing the call processing performance of the network. Location registration can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram showing a part of the entire configuration of a personal communication network to which an embodiment of the present invention is applied;

FIG. 3 is a block diagram showing an internal configuration of a location registration processing unit in the mobile terminal according to one embodiment of the present invention.

FIG. 4 is a flowchart illustrating a method of transmitting a position registration signal performed by a position registration processing unit.

FIG. 5 is a diagram illustrating an example of a specific position registration signal transmission process performed by a position registration processing unit.

FIG. 6 is a diagram illustrating a special example in which transmission of a location registration signal frequently occurs in a situation where communication is possible.

FIG. 7 is a diagram illustrating a method of a location registration process in a conventional mobile terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Position change detection means 2 Storage means 3 Timer 4 Calculation means 5 Signal transmission discrimination means 6 Signal transmission means

Claims (2)

(57) [Claims] For all mobile communication devices subscribing to a network, each device has a database storing a location registration area to which the mobile communication device currently belongs. When the location registration area to which the self belongs belongs has changed, the location registration area to which the self belongs belongs is notified to the network by transmitting a location registration signal. In a location registration method in a mobile communication network for rewriting location information of a mobile communication device that has transmitted a signal to a location registration area notified by the location registration signal, each of the mobile communication devices includes a location registration area to which the own device belongs. A position change detecting means (1) for detecting a change in the position registration area detected by the position change detecting means (1). A storage means (2) for storing up to the preceding number of times (arbitrary positive integer); a timer (3); and each time a change in the location registration area to which the own device belongs is detected by the position change detection means (1). , The timer (3)
Stop the clocking operation, and store the current time and the storage means (2).
The time difference tt from the position registration area change detection time N times before stored in the storage means (2) is calculated, and the current time is newly stored in the storage means (2).
Calculating means (4) for erasing the change detection time of the previous location registration area; and determining whether or not the time difference tt calculated by the calculating means (4) is equal to or longer than a predetermined time T1. If so, the location registration area to which the own device belongs is notified to the network by transmitting a location registration signal. On the other hand, if the location registration area is less than the predetermined time T1, the timer (3) measures the predetermined time T2. And a signal transmission discriminating means (5) for initiating the communication. The timer (3) receives, from the timer (3), an expiration notification of the predetermined time T2. And a signal transmitting means (6) for notifying the location registration method in the mobile communication network. 2. The predetermined time T1 is equal to the predetermined time T2.
The location registration method in a mobile communication network according to claim 1, wherein the location registration method is larger than the first location.