JP2947263B2 - Mobile communication system, radio base station, and mobile device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, a radio base station and a mobile station in the mobile communication system. In particular, it is used for a location registration method and a paging method of a mobile device in a mobile communication system, and is used for a location registration method and a paging method of a mobile device moving between a plurality of wireless zones in a mobile communication system having an overlapping location registration area. Used.

[0002]

2. Description of the Related Art In a conventional mobile communication system such as a mobile phone or a mobile phone, a small zone system is adopted in which the entire service area of the mobile communication system is covered by a plurality of wireless zones. Here, the wireless zone refers to a range in which each wireless base station performs communication using a wireless channel with a mobile device mounted on an automobile or the like. One wireless base station is arranged in one wireless zone, and a plurality of mobile stations move freely in each wireless zone.

[0003] In a mobile communication system using the small zone system, each mobile station must perform location registration to inform a radio base station which radio zone is currently in preparation for a call. In general, in order to prevent an increase in traffic of control signals for location registration, the entire service area is divided into a group of several adjacent wireless zones, and a plurality of location registration areas are set. The mobile device performs location registration each time the location registration area changes. When there is an incoming call to a mobile device, the radio base stations in the location registration area simultaneously call the location registration area where the mobile device has registered the location. However, the size of the location registration area is selected to be an appropriate size because if the number of wireless zones belonging to the location registration area becomes too large, the traffic for paging increases and is inefficient.

There are two types of location registration areas: a non-overlapping location registration area in which the radio zone belonging thereto is fixed, and an overlapping location registration area in which the radio zone belonging thereto changes.

[0005] In a location registration area having no overlap, the relationship between the location registration area and the wireless zone belonging to the location registration area is numerically one.
There is a relation of n (n is a natural number), and one wireless zone does not belong to a plurality of location registration areas. In a mobile communication system, a mobile station near the boundary of a location registration area may frequently repeat traversing the location registration area. In such a case, if a non-overlapping location registration area is set, the frequency of location registration by the mobile device increases. As a result, there is a problem that control signal traffic for location registration concentrates on the radio base station near the boundary of the location registration area.

[0006] This problem can be solved by using overlapping location registration areas. That is, if wireless zones overlap in the first location registration area and the second location registration area, as long as the mobile station moves through the overlapped wireless zone, there is no need to re-register the location, and the control signal traffic can be reduced. The concentration problem is solved. In order to set an overlapping location registration zone, a collection of a plurality of wireless zones near the wireless zone with which the mobile device has recently performed location registration may be newly set as the second location registration area.

As an example, there has been proposed a method of setting an overlapping location registration area for each wireless zone based on the two-dimensional location coordinates of each wireless base station (IEICE, IEICE, 1989 Spring National Convention, Article No. B-
863).

According to this method, when a mobile station registers a position with a wireless base station belonging to a certain wireless zone, the mobile station stores the position coordinates reported from the wireless base station that has performed the position registration. Each time the mobile station moves from one wireless zone to another, it receives the position coordinates reported by the wireless base station in the shifted wireless zone. Then, when the mobile station moves to a wireless zone of the wireless base station which is at least a predetermined distance R or more away from the wireless base station which has performed the location registration, the next location registration is performed.

Hereinafter, a method of setting the above-described non-overlapping position registration area and a conventional method of setting the overlapping position registration area will be described with reference to the drawings.

Referring to FIG. 1, a mobile communication system according to the related art and the present invention includes a plurality of radio zones Zi (Z1 to Z23 in the figure) and a plurality of radio base stations B.
The mobile station includes Si (BS1 to BS23 in the figure), a mobile station 1, a radio channel controller 2, and a public line network 3. The wireless channel control device 2 is a device that forms a part of the circuit switching center 4. Here, the suffix i of the wireless zone Zi and the wireless base station BSi is a natural number. Symbols without a suffix shall represent the whole, including symbols that appear thereafter. The wireless base station BSi is arranged one by one for each wireless zone Zi. The wireless base station BSi is given the same number as the number of the wireless zone Zi to which it belongs. As the mobile device 1, one of a plurality of mobile devices mounted on an automobile or the like is shown as a representative. The mobile device 1 can move freely in the entire wireless zone Z. The radio line control device 2 is connected between the public line network 3 and all the radio base stations BS that supervise each other.
Control S. This mobile communication system employs a small zone system in which the entire service area is covered by a plurality of wireless zones Z.

In the mobile communication system shown in FIG. 1, when a conventional non-overlapping location registration area is adopted, for example, the wireless zones Z1 to Z9 are the first location registration area, and the wireless zones Z10 to Z18 are the same. It is fixedly assigned to the second location registration area. When the location registration area is allocated as described above, the mobile device 1
Near the boundary between the location registration area and the second location registration area,
For example, if the traversal between the wireless zones Z8 and Z11 is frequently repeated, the frequency of location registration increases. As a result, in the wireless base stations Z8 and Z11 near the boundary of the location registration area,
There is a problem that control signal traffic for location registration is concentrated.

Referring to FIG. 23, overlapping location registration areas P4 and P9 are located in a wireless zone Z at the center thereof.
4 and Z9, the wireless base stations BS4 and BS9 are respectively constituted by wireless zones within a circle within a certain distance R. That is, the location registration area P4 is in the wireless zones Z1, Z2, Z4, Z5, Z6, Z7.
And the location registration area P9 includes the wireless zone Z.
5, Z6, Z7, Z8, Z9, Z10, Z11 and Z
12 inclusive. Therefore, the wireless zones Z5 to Z8 overlap the location registration areas P4 and P9. The position registration of the mobile device 1 moving in the service area is performed for each wireless zone Zi using the two-dimensional position coordinates of the wireless base station BSi belonging to the wireless zone Zi (The Institute of Electronics, Information and Communication Engineers, National Spring Meeting). No. B-863).

Referring to FIG. 24, a method of setting a location registration area in the conventional example shown in FIG. 23 will be described. The mobile device 1 performs position registration with a certain radio base station BSi, for example, the radio base station BS4 belonging to the radio zone Z4, and stores the position coordinates reported from the radio base station BS4 (step 101). After that, each time the mobile device 1 moves in the wireless zone Zi, the mobile station 1
Receives the position coordinates notified by the user (step 10).
2). Then, the distance between the position coordinates of the wireless base station BS4 and the moved wireless base station BSi is calculated, and it is determined whether or not the distance is longer than a certain distance R (step 103). As a result of the determination, the distance between the position coordinates is the distance R
In the case where the mobile device 1 is separated by more than
9, the radio base station B belonging to the radio zone Z9
If the position coordinates have been received from S9, step 1
Return to 01. Then, the mobile device 1 registers the position with the wireless base station BS9 and stores the position coordinates of the wireless zone Z9.

However, the location registration area P based on the coordinates of the radio base station BSi with which the mobile device 1 has performed location registration is referred to.
i includes a circle having a uniform constant radius R regardless of the position where the mobile device 1 exists. As a result, for example, as in the case where the mobile device 1 travels only one-dimensionally, such as traveling on a highway that is constructed linearly, the wireless zone Zi has no possibility of movement. However, there is a disadvantage that the position registration area Pi including the setting is set.

[0015]

SUMMARY OF THE INVENTION A first object of the present invention is to provide a mobile communication system using a small zone system.
An object of the present invention is to provide a mobile communication system, a radio base station, and a mobile device that can reduce control traffic for location registration of the mobile device.

A second object of the present invention is to provide a location registration system capable of setting a location registration area efficiently. A third object of the present invention is to provide a mobile communication system, a radio base station, and a mobile station that can equalize the loads of devices constituting the system in a mobile communication system using a small zone system. .

[0017]

In the mobile communication system according to the present invention, the entire service area is covered by a plurality of radio zones. One wireless base station is arranged in each wireless zone. Each of the plurality of mobile devices freely moves in each wireless zone and communicates with a wireless base station belonging to a staying wireless zone through a wireless channel. Each wireless base station is generally connected to a public telephone line via a circuit switching office that controls a plurality of wireless base stations. In this mobile communication system, it is necessary for each mobile station to register a current wireless zone in a wireless base station belonging to a staying wireless zone using a location registration signal. The location information of the mobile device is managed by the circuit switching office in units of a location registration area composed of a plurality of wireless zones. The location registration area is configured in the form of “overlapping location registration area” in which a specific wireless zone can belong to a plurality of location registration areas.

The location registration method of the present invention determines whether or not to perform location registration in a destination wireless zone according to the location of the wireless zone in which the location was previously registered. According to the invention, the location registration area is set based on the route information from the mobile device.

In one aspect of the present invention, each radio base station sets a location registration area (hereinafter, sometimes referred to as its location registration area) based on its own station including a plurality of radio zones, and Information (hereinafter, referred to as location registration area information) is held, for example, in the form of a wireless zone identifier. When a radio base station receives a location registration signal from a mobile device, the radio base station notifies the mobile device that has transmitted the location registration signal of the stored location registration area information. The mobile station notified of the location registration area information stores the information. Then, when the mobile device moves to a wireless zone not included in the held location registration area information, the mobile device performs location registration with the wireless base station.

In another aspect of the present invention, each radio base station holds a plurality of radio zones as location registration areas, for example, in the form of radio zone identifiers. Also, each wireless base station constantly reports its own location registration area information. The mobile device stores the wireless zone in which the position registration has been performed most recently, and performs position registration when the mobile device moves to a wireless zone that is not included in the notified position registration area information.

As a specific method of setting a position registration area which is a feature of the present invention, there is a method described below.

The mobile device records the identifier of the wireless zone in which the location registration has been performed and the identifier of the wireless zone that has passed after performing the location registration as route information. Then, in the destination wireless zone, the identifier is checked whether it is included in the location registration area information held by itself or broadcast by the wireless base station, and when it is determined that the identifier is included,
The identifier of the destination wireless zone is added to the route information. If it is determined that the identifier of the destination wireless zone is not included in the held location registration area information, the location is registered with the wireless base station in the destination wireless zone, and the held route is stored. Notify information.

The radio base station accumulates radio zone identifiers included in the route information notified from the mobile device. Then, a set of n (n is a natural number) wireless zones and own wireless zones having a large cumulative value of identifiers is set as a location registration area. Then, the location registration area is sequentially updated according to the change in the cumulative value of the identifier. The latest location registration area information is reported to mobile devices in the own wireless zone.

According to the present invention, each radio base station determines its own location registration area in an autonomous and distributed manner. Therefore, this mobile communication system can realize an overlapped location registration area, and can prevent concentration of location registration traffic due to frequent location registration in a wireless zone at the boundary of the location registration area. Also, each radio base station learns the route information received from the mobile device that has performed location registration, and in consideration of the possibility of movement of the mobile device, the mobile device does not need to perform location registration frequently. An efficient location registration area can be set.

In the paging system of the present invention, the circuit switching office holds an identifier of a mobile station having the circuit switching office as a home memory station and location registration area information of the mobile station in the form of a wireless zone identifier. . When an incoming call (call) is made to a certain mobile station, the circuit switching station searches in which wireless zone the location of the called mobile station has been registered.
Then, the circuit exchange notifies the radio base station controlled by the circuit exchange of a paging signal including the location registration area of the called mobile station. When the notified base station is included in the notified location registration area, the notified base station calls the mobile station in the own wireless zone.

The radio base station holds its own location registration area information. Upon receiving the paging signal from the circuit switching office, it checks the stored location registration area information,
If the location registration area in the received paging signal includes the identifier of the wireless zone in the retained location registration area information, a call is made to the own wireless zone.

[0027] When a mobile station is called by the method of the present invention, the mobile station performs location registration once and then is always called even in a wireless zone passing without location registration. By doing so, the circuit switching station does not need to hold the information of the location registration area based on each wireless base station, and the load can be reduced.

In the present invention, preferably, each radio base station increases or decreases the number of radio zones included in its own location registration area in accordance with the traffic volume of a call signal transmitted from each radio base station to a mobile station. . Alternatively, each wireless base station increases or decreases the number of wireless zones included in its own location registration area in accordance with the traffic volume of a paging signal to the mobile station received by each wireless base station from the circuit exchange. Alternatively, each wireless base station increases or decreases its own location registration area according to the traffic of the call signal or the traffic of the location registration signal.
That is, when the traffic volume of a paging signal transmitted from each radio base station to a mobile device exceeds a predetermined amount, the number of radio zones included in the location registration area is reduced. When the traffic volume of the location registration signal of the mobile station received by each wireless base station exceeds a predetermined amount, the number of wireless zones included in the location registration area is increased. By doing so, each wireless base station can increase or decrease its own location registration area according to the traffic. As a result, in this mobile communication system, it becomes possible to distribute the processing of the traffic of the call signal and the traffic of the location registration signal to the respective radio base stations. This leads to prevention of an increase in connection delay between the mobile station and the radio base station, and prevention of paging traffic and location registration signal traffic from interfering with other control signals.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

Referring again to FIG. 1, as a location registration area PAi according to the present invention, PA5, PA8, PA12 and PA15 which are a group of several radio zones Zi.
It is shown. Location registration area PA5, PA8, PA
12 and PA15 are wireless zones Z5, Z8,
This is a location registration area based on Z12 and Z15.
The location registration area PA5 is a wireless zone Z1, Z2, Z4.
Z5, Z6, Z7 and Z8 consist of 7 wireless zones, and the location registration area PA8 is a wireless zone Z4, Z5, Z6 and Z.
7, Z8, Z9, Z10, Z11, Z12, and Z13, each of which includes ten wireless zones, and the location registration area PA12 has wireless zones Z7, Z8, Z9, Z10, Z11, Z12,
Z13, Z14, Z15 and Z16 are comprised of 10 wireless zones, and the location registration area PA15 is a wireless zone Z11,
Z12, Z13, Z14, Z15, Z16, Z17, Z
It is assumed that there are 10 wireless zones of 18, Z19 and Z20. Then, the location registration and simultaneous paging of the mobile device 1 are performed for each location registration area PAi.

Referring to FIGS. 1 and 2, a sequence flow of a signal for position registration between the radio base station Zi and the mobile station 1 in the first embodiment will be described.

For example, the mobile station 1 transmits the radio base station ID code (identifier ZSi for identifying the radio zone Zi) included in the radio zone identification number (ID) signal a1 broadcast from the radio base station BS5 of the radio zone Z5. Here, the identifier is ZS5) (1). Signal a1
Mobile station 1 having received the location registration signal b1 transmits a location registration signal b1 to the wireless base station BS5 when it is determined that location registration is required (2). The radio base station BS5 that has received the location registration signal b1 transmits a location registration confirmation signal c1 indicating that the location registration signal b1 has been registered to the mobile device 1 (3). At the same time, the wireless base station BS5 is in the wireless zone Z.
Then, a location registration area signal d1 composed of a series of identifiers ZSi (radio base station ID codes) of the wireless zones Zi included in the location registration area PA5 based on No. 5 is transmitted (4).
The mobile device 1 stores a set of identifiers ZSi included in the received location registration area signal d1. Then, mobile device 1
Receives the identifier ZS15 of the wireless zone Z15, for example, by moving to the wireless zone Z15 (1). The identifier ZS15 is the location registration area signal d1 received earlier.
, The location registration operation (2) described above is performed again.

Here, an example of the signal configuration of the signals a1, b1, c1 and d1 shown in FIG. 2 will be described with reference to FIG.

The radio zone identification number (ID) signal a1 is
A notification code indicating that this signal a1 is a notification signal,
Radio base station I for identifying the transmitting radio base station BSi
It comprises D code (identifier ZSi of wireless zone Zi) and additional information indicating the geographical status of the transmitting wireless base station. The position registration signal b1 includes a registration request code indicating that the signal b1 is a position registration signal, a wireless base station ID code indicating a wireless base station of a transmission destination, and a mobile device ID code of the mobile device that transmitted the mobile device (identifying the mobile device). Identifier MSi) and additional information indicating the type of the mobile station that transmitted the information. In addition, as the additional information of the position registration signal b1 or as an independent signal, the route information indicating the wireless zone Zi that the mobile device 1 has passed, that is, the travel route of the mobile device 1, is transmitted at the same time. The location registration confirmation signal c1 includes a registration confirmation code indicating that the signal c1 is a location registration confirmation signal, a mobile station ID code indicating a destination mobile station, a wireless base station ID code of a wireless base station that transmitted the information, and additional information. It consists of. The location registration area signal d1 includes an area notification code indicating that the signal d1 is a location registration area signal, a mobile station ID code for identifying a mobile station of a transmission destination, and the number of radio base stations included in the location registration area. It consists of the number of wireless base stations in the location registration area shown, a plurality of wireless base station ID codes showing the wireless base stations in this location registration area, and additional information. The position registration area signal d1 may be transmitted as additional information of the position registration confirmation signal c1.

The operation of the first embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3.

When the power of the mobile device 1 is applied in the wireless zone Z5, the mobile device 1 first transmits a location registration signal b1 in the wireless zone Z5 to perform location registration. Wireless zone Z
When the wireless base station BS5 belonging to No. 5 registers the location of the mobile device 1, the wireless zone Z1, Z2, Z4, Z5 included in the location registration area PA5 together with the location registration confirmation signal c1. Radio base station ID codes (identifiers ZS1, ZS1) indicating the identification numbers of Z6, Z7, and Z8
ZS2, ZS4, ZS5, ZS6, ZS7 and ZS
8) is transmitted to the mobile device 1. The mobile device 1
From the position registration area signal d1, a plurality of wireless zones Zi included in the position registration area PA5 are identified by, for example, the identifier ZSi.
Remember in the form of Next, a case where the mobile device 1 moves from the wireless zone Z5 to the wireless zone Z12 through the wireless zone Z8 will be considered as an example. Even if the mobile device 1 moves from the wireless zone Z5 to the wireless zone Z8, the wireless zone ID signal a
1 is a wireless zone included in the location registration area signal d1 received when the mobile device 1 has performed location registration in the wireless zone Z5. Therefore, the mobile device 1 does not perform location registration. However, when the mobile device 1 moves from the wireless zone Z8 to the wireless zone Z12, the wireless zone Z12 notified by the wireless zone ID signal a1 becomes the location registration area signal d1 received by the mobile device 1 in the wireless zone Z5. Since it is not included, the mobile device 1 needs to perform location registration using the location registration signal b1. When the mobile device 1 performs location registration in the wireless zone Z12,
The mobile device 1 stores the location registration area PA12 provided by the new location registration area signal d1 received together with the location registration confirmation signal c1. By using such a location registration area PAi and location registration method, even if the mobile device 1 moves to the wireless zone Z8 immediately after performing the location registration in the wireless zone Z12, the mobile device 1 is not moved to the wireless zone Z12. The identifier ZS of the wireless zone Z8 is included in the location registration area signal d1 received when performing location registration.
8 does not perform the location registration again in the wireless zone Z8.

Referring to FIG. 4, one configuration example of the mobile device 1 used in the first embodiment is an antenna 11, a radio transmitting / receiving device 12, and a location zone location registration area extracting device 13
, A location registration area storage device 14, a route information creation storage device 15, and a location registration signal generation device 16.

The antenna 11 and the radio transmitting / receiving device 12 establish a radio channel between the radio base station BSi and transmit and receive signals. Location zone location registration area extraction device 13
Has a function of extracting the identifier ZSi of the wireless zone from the wireless zone ID signal a1 and the location registration area signal d1 received from the wireless transmitting and receiving device 12, and stores the extracted identifier ZSi and the route information creation storage device 14 as control functions. With the extracted route information (which is a set of wireless zones Zi that the mobile device 1 has passed since the previous location registration), and the extracted identifier ZSi and the location registration area storage device 1
4, a function for collating with the location registration area information (which is a set of identifiers ZSi of the wireless zones Zi included in the location registration area stored when the location registration is first performed), and an extracted identifier ZSi Has a function of storing the location registration signal b1 in the location registration area storage device 14 or the route information creation storage device 15, and a function of instructing the location registration signal generation device 16 to transmit the location registration signal b1. Location registration signal generator 1
6 has a function of transmitting the position registration signal b1 and the route information to the wireless transmission / reception device 12.

Referring to FIG. 5, one configuration example of the radio base station BSi corresponding to the mobile station 1 shown in FIG.
, A wireless transmitting / receiving device 22, a nearby wireless zone information updating device 23, a nearby wireless zone information storage device 24, a location registration area determining device 25, and a location registration area storage device 26
And a location registration area notification device 27.

The antenna 21 and the radio transmission / reception device 22 establish a radio channel between the mobile device 1 and transmit and receive signals. The neighboring wireless zone information updating device 23 extracts the route information included in the position registration signal b1 received from the wireless transmitting / receiving device 22, and updates data relating to the route information in the neighboring wireless zone information storage device 24. The neighboring wireless zone information storage device 24 accumulatively calculates the appearance frequency of the identifiers ZSi of the plurality of wireless zones Zi included in the route information by using a counter included therein, and holds the accumulated frequency information of the identifiers ZSi. This frequency information is stored in this radio base station B
It becomes original data for determining the position registration area PAi based on Si. The location registration area determination device 25 uses the identifier ZS accumulated in the neighboring wireless zone information storage device 24.
The set of the n wireless zones Z and the own wireless zone Zi selected in order from the largest one is determined as a new location registration area PAi. The latest location registration area PAi determined by the location registration area determination device 25 is stored in the location registration area storage device 26 in the form of a set of identifiers ZSi of the wireless zones Zi. When the position registration confirmation signal c1 is transmitted, the position registration area notifying device 27 reads the position registration area information from the position registration area storage device 26 at the same time, and transmits the position registration area information via the wireless transmitting / receiving device 22 and the antenna 21. Is transmitted to the mobile device 1.

Here, referring to FIG. 6, identifier ZSx of wireless zone Zx (suffix x is an arbitrary number) extracted from the route information transmitted by mobile device 1 and stored in a counter in neighboring wireless zone information storage device 24. An example of a database will be described. This database is
It consists of two records: an identifier ZSx of the wireless zone and an accumulated count Zx-count for each identifier ZSx. Then, for a plurality of mobile devices that have performed location registration in the own wireless zone Zi, the cumulative number of previous wireless zones Zx in which location registration was performed is stored. That is, this figure shows that among the mobile stations that have performed location registration with the wireless base station BSi having this database, the mobile stations that have performed location registration last time in the wireless zone Zx represented by the identifier ZSx are Zx-c
This indicates that the device is on the stage.

Next, the operation of the mobile station shown in FIG. 4 will be described with reference to FIGS.

First, the mobile station 1 transmits the radio zone ID signal a1 broadcast from the radio base station BSi to the antenna 11
Is received by the wireless transmitting / receiving device 12. Then, the located zone location registration area extraction device 13 outputs the wireless zone ID.
The identifier ZSi of the wireless zone Zi is extracted from the signal a1 (step 201). Next, the located zone position registration area extraction device 13 checks whether or not the extracted identifier ZSi is included in the route information stored in the route information creation storage device 15 (step 202). If the extracted identifier ZSi is included in the route information, the located zone location registration area extraction device 13 does not perform any processing and returns to step 201. If the identifier ZSi is not included in the route information, the located zone location registration area extraction device 13 stores the location registration area stored in the location registration area storage device 14 and obtained from the wireless base station that performed the previous location registration. It is checked whether the information includes the extracted identifier ZSi (step 203). If the stored location registration area information includes the identifier ZSi, the located zone location registration area extraction device 13 sends the route information creation storage device 1
The identifier ZSi of the wireless zone Zi is added to the route information of No. 5 (step 204), and the process returns to step 201. In step 203, if the identifier ZSi is not included in the location registration area information in the location registration area storage device 14, the located zone location registration area extraction device 13 sends the location registration signal b1 to the location registration signal generation device 16. To instruct. The position registration signal generator 16 reads a set of identifiers ZSi stored in the path information creation storage 15 as path information, generates the position registration signal b1 by including it in the additional information, and generates the position registration signal b1. 11
(Step 20)
5). Then, the located zone registration area extraction device 13
The route information in the route information creation storage device 15 is reset once (step 206), and the identifier ZSi of the wireless zone Zi being located is added to the route information (step 20).
4) Return to the processing of step 201. Thus, FIG.
Moves while creating route information indicating what wireless zone Zx has passed.

Next, the operation of the radio base station BSi shown in FIG. 5 will be described with reference to FIGS. Wireless base station B
Si constantly transmits the identifier ZSi of its own wireless zone Zi from the antenna 21 by the wireless zone ID signal a1. The radio base station BSi receives the location registration signal b1 and the path information included therein from the mobile device 1 by the antenna 21 and the radio transmission / reception device 22 (step 30).
1). The location registration area notification device 27 outputs the location registration signal b
1 from the wireless transmission / reception device 22, the location registration signal b
1 own radio zone Z already set at the time of receiving
The information of the position registration area PAi based on i is read from the position registration area storage device 26, and the position registration area signal d is read.
Create 1. Then, the mobile station 1 transmits the location registration area signal d1 together with the location registration confirmation signal c1 to the mobile device 1 that has transmitted the location registration signal b1 via the wireless transmitting / receiving device 22 and the antenna 21 (step 302). The position registration signal b1 is also input from the wireless transmitting / receiving device 22 to the neighboring wireless zone information updating device 23. Then, the neighboring wireless zone information updating device 23 increases the cumulative value of the identifier ZSx of the wireless zone Zx included in the received route information by one in the counter of the identifier ZS of the neighboring wireless zone information storage device 24 (step 303). .

The location registration area determining device 25 sequentially determines the n wireless zones Zx and the own wireless zone ZS in descending order of the accumulated value of the route information in the neighboring wireless zone information storage device 24.
The set with i is determined as the location registration area PAi. However, n is an appropriate natural number, and each radio base station BSi may determine it independently. Determined location registration area PAi
Is stored in the location registration area storage device 26 as the latest location registration area information (step 304).

As described above, the radio base station B shown in FIG.
Si is an identifier Z of a plurality of wireless zones Z as path information.
The accumulated value for S is held, and a position registration area PAi based on the own wireless zone Zi is determined according to the route information to perform position registration.

Next, referring to FIG. 1, a first station including the mobile station 1 shown in FIG. 4 and the radio base station BSi shown in FIG.
A description will be given of the path information creation operation in the embodiment.

After the mobile device 1 has performed location registration in the wireless zone Z5, it is assumed that the mobile device 1 moves from the wireless zone Z5 to the wireless zone Z12 via the wireless zone Z8. The mobile device 1 holds PA5 as a location registration area and an identifier ZS5 of the wireless zone Z5 as route information in the location registration area storage device 14 immediately after performing location registration in the wireless zone Z5. The mobile device 1 keeps the identifier ZS of the wireless zone Z5 while moving in the wireless zone Z5 where the location registration has been performed.
5 is received, but since the identifier ZS5 is included in the held path information, no processing is performed on the identifier Z5, and the processing shifts to a state of waiting for the identifier ZSi of the wireless zone Zi. When moving from the wireless zone Z5 to the wireless zone Z8, the mobile device 1 receives the identifier ZS8 of the wireless zone Z8 broadcast from the wireless base station BS8 of the wireless zone Z8. Since the identifier ZS8 is not included in the route information held by the mobile device 1, the mobile device 1 checks whether or not the location zone PA5 held includes the wireless zone Z8. In this case, since the identifier ZS8 is included in the location registration area PA8 held by the mobile device 1, the mobile device 1
The identifier ZS8 is added to the route information, and the route information is changed to $ ZS.
5, ZS8}, the identifier ZSi of the wireless zone Zi again
Waits for reception. Next, the mobile station 1 sets the wireless zone Z
8 to the wireless zone Z12, the identifier ZS12 extracted from the notified wireless zone ID signal a1 becomes
The location registration area P is also stored in the route information stored in the mobile device 1.
Since it is not included in A12, the mobile station
Location registration is performed with the twelve wireless base stations BS12. At this time, the mobile device 1 transmits the identifier {ZS5, ZS8} of the wireless zone, which is the route information, together with the location registration signal b1 to the wireless base station BS12 which performs location registration. Then, mobile device 1
Resets the route information, adds Z12 to the route information, holds the route information as {ZS12}, and waits for reception of the identifier ZSi of the wireless zone Zi again.

The radio base station BS12 which has received the location registration signal b1 and the path information {ZS5, ZS8} included in the location registration signal b1 from the mobile station 1 sends a location registration confirmation signal c1 to the mobile station 1.
Is transmitted to the mobile device 1 together with information indicating the location registration area PA12 based on the own wireless zone Z12, that is, the location registration area signal d1. After that, the wireless base station BS12 increases the cumulative value of the identifiers ZS5 and ZS8 included in the received route information by one, selects n wireless zones in descending order of the cumulative value, and selects its own wireless zone Z1.
2 to determine a new location registration area PA12.
In this embodiment, the number n of the wireless zones Z belonging to the location registration area PA12 and excluding the own wireless zone Z12 is nine.

As described above in detail, in the first embodiment of the mobile communication system according to the present invention including the mobile station 1 shown in FIG. 4 and the radio base station BSi shown in FIG. 5, each radio base station The BSi can independently set the location registration area PAi using the route information received from the mobile device 1 that has performed the location registration in the own wireless zone Zi, so that the overlapping location registration area PA can be realized. In addition, since the radio base station BSi can set the location registration area PAi in consideration of how likely the mobile device 1 moves from the wireless zone Zi in which the location registration has been performed, the location registration is frequently performed. It is possible to set an efficient location registration area without performing it. Further, the radio base station BSi
Since the location registration area PAi can be set based on the wireless zone Zi in which the mobile device 1 has performed location registration,
Frequent location registration near the boundary of the location registration area that occurred in the case of the conventional location registration area P without overlap, and control traffic for location registration concentrated on the wireless base station BS near the boundary of the location registration area Can be prevented.

Referring to FIG. 1 and FIG. 9, a sequence flow of a signal for position registration between the radio base station BSi and the mobile station 1 in the second embodiment will be described.

The mobile station 1 transmits, for example, a wireless base station ID code included in the location registration area PA5 based on the wireless zone Z5, which is broadcast from the wireless base station BS5 belonging to the wireless zone Z5, that is, the wireless zone Z. Identifier ZS
The location registration area signal d2 including the list of
1). When determining that it is necessary to perform location registration, the mobile device 1 transmits a location registration signal b2 to the radio base station BS5 (22). Radio base station BS that has received location registration signal b2
5 transmits a position registration confirmation signal c2 to the mobile device 1. The mobile device 1 that has received the position registration confirmation signal c2 stores the identifier ZS5 of the wireless zone Z5 in which the position registration has been performed. Then, in the further destination wireless zone Zi, the identifier ZS of the wireless zone Z included in the notified location registration area signal d2 and the stored wireless zone Z
5 is compared with the identifier ZS5. As a result, the mobile device 1
Only when the location registration area signal d2 does not include the identifier ZS5 of the wireless zone Z5 for which the location registration has been performed, a new location registration is performed. Here, referring to FIG.
The signal configuration example of the signals d2, b2 and c2 shown in FIG.

The position registration area signal d2 is
Is a broadcast signal indicating that this is a broadcast signal, a wireless base station ID code (identifier ZSi) for identifying a transmitting wireless base station Zi, and a wireless base station belonging to a location registration area PAi based on the wireless base station Zi. The number of wireless base stations in the location registration area indicating the number, the wireless base station ID code (identifier ZS) of the wireless base station BS belonging to the location registration area PAi
And additional information. The position registration signal b2 and the position registration confirmation signal c2 may have the same signal configuration as the position registration signal b1 and the position registration confirmation signal c1 in the first embodiment, respectively.

The operation of the second embodiment of the present invention will be described with reference to FIGS. 1, 9 and 10.

When the power of the mobile device 1 is applied in the wireless zone Z5, the mobile device 1 first transmits a location registration signal b2 in the wireless zone Z5 to perform location registration. Wireless zone Z
When the wireless base station BS5 belonging to No. 5 registers the location of the mobile device 1, it transmits a location registration confirmation signal c2 to the mobile device 1, and the mobile device 1 identifies the wireless zone Z5 in which the location registration has been performed, for example, its identifier Z5. By memorizing. Next, the mobile device 1 moves from the wireless zone Z5 to the wireless zone Z8 through the wireless zone Z8.
Consider the case of moving to 2 as an example. Even if the mobile device 1 moves from the wireless zone Z5 to the wireless zone Z8, the location registration area signal P including the wireless zone Z5 in the wireless zone Z8.
A8 is notified, and the mobile device 1 does not need to perform location registration. However, when the mobile device 1 moves from the wireless zone Z8 to the wireless zone Z12, the location zone signal d2 broadcast by the wireless base station BS12 in the wireless zone Z12 does not include the wireless zone Z5. 1 performs location registration. By using such a setting of the location registration area PA and the location registration method, even if the mobile device 1 moves again to the wireless zone Z8 immediately after performing the location registration in the wireless zone Z12, it is notified in the wireless zone Z8. Since the location registration area signal d2 includes the wireless zone Z12, the mobile device 1 does not need to perform location registration again in the wireless zone Z8.

As described above, also in the second embodiment, as in the first embodiment, efficient location registration and simultaneous paging of mobile units can be performed.

Referring to FIG. 11, an example of the configuration of a mobile device 1 used in the second embodiment is an antenna 11, a radio transmitting / receiving device 12, and a location zone location registration area extracting device 1
3, a path information creation storage device 15, a position registration signal generating device 16, and a position registration wireless zone storage device 31. This mobile device 1 is provided with a location registration wireless zone storage device 31 instead of the location registration area storage device 14 of the mobile device 1 shown in FIG. The location registration wireless zone storage device 31 stores the identifier ZSi of the wireless zone Zi that has performed location registration as a location registration identifier.

As the radio base station BSi corresponding to the mobile station 1 in the second embodiment, the radio base station BSi having the configuration shown in FIG. 5 used in the first embodiment can be used.

Next, referring to FIGS. 1 and 12, FIG.
The operation of the mobile device 1 shown in FIG.

In the second embodiment including the mobile station 1 shown in FIG. 11 and the radio base station BSi shown in FIG. 5, each radio base station BSi transmits to the mobile station 1 existing in its own radio zone Zi. , The location registration area signal d2 (FIG. 10) indicating the location registration area PAi based on the own wireless zone Zi is constantly notified. First, the mobile device 1 is connected to the radio base station BSi
Is received by the antenna 11 and the wireless transmission / reception device 12 (step 401). Then, the located zone location registration area extraction device 13 extracts the identifier ZSi of the wireless zone Zi to which the reporting wireless base station BSi belongs from the location registration area signal d2.
Is extracted (step 402). Next, the located zone position registration area extraction device 13 checks whether or not the extracted identifier ZSi is included in the route information stored in the route information creation storage device 15 (step 403). If the identifier ZSi is included in the route information, the located zone location registration area extraction device 13 does not perform any processing and returns to step 401. If the identifier ZSi is not included in the route information, the visited zone location registration area extraction device 13
The wireless zone Zy in which the location was previously registered and stored in the location registration wireless zone storage device 31 (hereinafter, referred to as a location registration wireless zone Zy. The suffix y is a natural number).
(Step 404) whether the identifier ZSy (hereinafter sometimes referred to as a position registration identifier ZSy) is included in the position registration area signal d2. Location registration identifier ZSy
Is included in the location registration area signal d2, the located zone location registration area extraction device 13 adds the identifier ZSi of the wireless zone Zi to the route information of the route information creation storage device 25 (step 405), and returns to step 401. Return to processing.
At step 404, the location registration identifier ZSy in the location registration wireless zone storage device 31 is stored in the location registration area signal d.
If the location registration signal b2 is not included, the located zone location registration area extraction device 13 instructs the location registration signal generation device 16 to transmit the location registration signal b2. The location registration signal generator 16 generates a location registration signal b2 and transmits it to the radio base station BSi via the radio transceiver 12 and the antenna 11 (step 406). Also, the located zone location registration area extraction device 13 resets the location registration wireless zone Zy in the location registration wireless zone storage device 31 (step 407).
Then, the located zone location registration area extraction device 13 once resets the route information in the route information creation storage device 15 (step 408), and replaces the identifier ZSi of the wireless zone Zi extracted from the location registration area signal d2 with the route information. (Step 405). Thereafter, the mobile device 1 returns to the process of step 401. In this way, the mobile device 1 shown in FIG. 11 moves while creating route information indicating what kind of wireless zone Zi has passed.

The radio base station BSi used in the second embodiment corresponding to the mobile station shown in FIG. 11 has the same configuration as the radio base station BSi used in the first embodiment shown in FIG. have. However, unlike the first embodiment in which the location registration area signal d1 is transmitted based on the reception of the location registration signal c1 from the mobile device 1, the location registration area signal d2 is constantly transmitted from the radio base station BSi. ing.
The processing after receiving the location registration signal b2 and the path information included therein from the mobile device 1 is the same as the processing of the radio base station BSi in the first embodiment.

Next, a description will be given of a route information generating operation in the second embodiment including the mobile station 1 shown in FIG. 11 and the radio base station BSi shown in FIG. 5, with reference to FIG.

After the mobile station 1 has performed location registration in the wireless zone Z5, it is assumed that the mobile device 1 moves from the wireless zone Z5 to the wireless zone Z12 via the wireless zone Z8. Immediately after performing the location registration in Z5, the mobile device 1 holds the identifier ZS5 of the location registration wireless zone in the route information creation storage device 15 as the route information. The mobile device 1 receives the location registration area signal d2 including the information of the location registration area PA5 and extracts the identifier ZS5 from the signal while moving in the wireless zone Z5 in which the location registration has been performed. ,
Since the identifier ZS5 is stored in the held path information, no processing is performed on the identifier ZS5, and the apparatus enters a state of waiting for reception of the position registration area signal d2. The mobile device 1
When moving from the wireless zone Z5 to the wireless zone Z8, a location registration area signal d2 including information on the location registration area PA8 broadcast from the wireless base station BS8 in the wireless zone Z8.
And extracts the identifier ZS8 of the wireless zone Z8.
However, since the identifier ZS8 is not included in the route information, the mobile device 1 checks whether or not the identifier ZS5 of the retained location registration wireless zone is included in the location registration area PA8. Since the identifier ZS5 is included in the location registration area PA8, the mobile device 1 adds the identifier ZS8 to the route information, sets the route information to {ZS5, ZS8}, and waits for reception of the location registration area signal d2 again. . Next, when the mobile device 1 moves from the wireless zone Z8 to the wireless zone Z12, the identifier ZS12 extracted from the received location registration area signal d2 is not included in the route information held by the mobile device 1, and Since the retained location registration wireless zone identifier ZS5 is also not included in the location registration area PA12, the mobile device 1 establishes the wireless base station BS1 in the wireless zone Z12.
2 is registered with the position registration signal b2. At this time, the mobile device 1 transmits the sequence {ZS5, ZS8} of the identifier of the wireless zone, which is the route information, together with the location registration signal b2 to the wireless base station BS12 which performs location registration. After that, the mobile device 1 stores ZS12 as the identifier of the location registration wireless zone Z12 in the route information creation storage device 15, resets the route information once, adds the identifier ZS12 to the route information, holds it as {ZS12}, It is in a state of waiting for reception of the position registration area signal d2.

The radio base station BS12 that has received the location registration signal b2 and the path information {ZS5, ZS8} included in the location registration signal b2 from the mobile station 1 sends the location registration confirmation signal c2 to the mobile station.
And the identifier ZS5 included in the received route information.
The cumulative value of ZS8 is increased by one. Then, from the wireless zone having the largest accumulated value, n are sequentially selected, and the wireless zone Z12 is selected.
And a new location registration area PA12 is determined. The number n of the wireless zones belonging to the location registration area PA is nine.

Referring to FIG. 13, according to a third embodiment of the present invention, a mobile station 1, a circuit switching center 4, a bus 5, and a plurality of radio zones Z (Z1, Z5, Z8, Z12, Z16 and Z20) and the radio base stations BS (BS1, BS5, BS
8, BS12, BS16 and BS20). The location registration areas PA (PA5, PA8, PA12 and PA16) correspond to the radio base stations BS5 and BS, respectively.
8, a location registration area based on BS12 and BS16. The circuit exchange 4 and the radio base station BS controlled by the circuit exchange 4 are connected by a bus 5. The mobile device 1, the radio zone Z, the radio base station BS, and the location registration area PA have the same system meaning as the system shown in FIG. The mobile device 1 moves while creating route information indicating what wireless zone Zi has passed. Each wireless base station BSi holds a counter for calculating the cumulative value of the identifier ZSi of each wireless zone Zi, and determines a location registration area PAi based on its own wireless zone Zi to perform location registration. The circuit switching center 4 also includes the radio network controller 12 shown in FIG. In addition, the circuit switching station 4 has location registration information indicating in which radio base station Zi the mobile device 1 has performed location registration. When a call is made to the mobile device 1, a broadcast call is made to all the radio base stations BS. It has a function to perform. In this figure, the connection between the circuit switching station 4 and the supervised radio base station BS is connected by a bus 5 having a high broadcast property often used for a packet network or the like. A type connection may be made.

In FIG. 13, the current location registration area PA5 includes wireless zones Z1, Z5 and Z8, and location registration area PA8 includes wireless zones Z5, Z8 and Z1.
2 and the location registration area PA12 is a wireless zone Z8,
It is assumed that the location registration area PA16 includes the wireless zones Z12, Z16, and Z20. The position registration area PA formed by such linear wireless zones Zi is formed, for example, when the mobile device travels on the expressway in only one direction.

Referring to FIG. 14, one configuration example of the radio base station BSi used in the third embodiment of the present invention is an antenna 21, a radio transmitting / receiving device 22, a position information receiving device 41,
Location registration area storage device 42 and data comparison device 43
Contains. The radio base station BSi transmits a call signal broadcast from the circuit switching station 4 to the location information transmitting / receiving device 41.
And sends it to the data comparison device 42. The data comparison device 42 compares the information of the own location registration area PAi held in the location registration area storage device 43 with the call signal, and the identifier ZSy of the wireless zone in which the called mobile device has registered the position is registered. It is checked whether or not it is stored in the area signal storage device 43. When the wireless zone ZSy whose location is registered by the mobile device 1 is included in the location registration storage device 43, a call signal is transmitted to the own wireless zone Zi via the wireless transmitting / receiving device 22 and the antenna 21. here,
The location registration area storage device 43 includes the functions of the neighboring wireless zone information updating device 23, neighboring wireless zone information storage device 24, location registration area determination device 25, and location registration area storage device 26 of the wireless base station shown in FIG. In.
The wireless transmission / reception device 22 includes the function of the location registration area notification device 27 in FIG.

Next, referring to FIG. 13 and FIG.
The procedure of location registration and calling in the embodiment of the present invention will be described.

When the mobile station 1 performs location registration in the radio zone Z8, the radio base station BS8 transmits the identifier ZS8 of the self radio zone Z8 and the identifier MS1 of the registered mobile station 1 via the location information transmitting / receiving device 41. To the circuit exchange station 4.
Then, the circuit exchange 4 changes the location registration data of the mobile device 1 held by itself.

When there is an incoming call to the mobile station 1, the circuit switching station 4 searches the location registration data for the identifier ZS8 of the wireless zone Z8 in which the mobile station 1 is performing location registration, and finds the identifier of the mobile station 1. A paging signal including the MS1 and the identifier ZS8 of the wireless zone Z8 is simultaneously notified to all the wireless base stations Z controlled by the circuit switching center 4. Each radio base station BSi that has received the paging signal compares the identifier ZS of the wireless zone included in the location registration area PAi held with the identifier ZS8 of the wireless zone Z8 in the received paging signal. Then, the wireless base stations BS5, BS8 and BS12 in which the identifier ZS8 of the wireless zone exists in their own location registration areas PA5, PA8 and PA12 report a call signal to their respective wireless zones Z1, Z5, Z8, Z12 or Z16. Thus, the mobile station 1 is called.
According to this method of calling a mobile device, the mobile device 1
Will be called in the wireless zone Z that passes without performing location registration once.

Referring to FIG. 15, circuit switching office 4
An example of the location registration data held by the
It consists of a column of S and a column of an identifier ZS of the location registration wireless zone. Then, in which wireless zone the mobile device 1 is currently performing location registration is stored. In this figure, the wireless zone in which the mobile station 1 to which the identifier MS4 has been given the most recent location registration is the wireless zone Z
8 is represented.

Also, in the third embodiment, similarly to the first and second embodiments, each radio base station BSi transmits the route information received from the mobile station 1 which has performed location registration in its own radio zone Zi. Location registration area PA
Needless to say, i can be realized. Further, in the third embodiment, the circuit switching station 4 does not need to manage the information of the location registration area PAi, and the radio base station BSi can make a call based on its own judgment.
Without overloading.

Referring to FIG. 16, the radio base station BSi according to the fourth embodiment of the present invention comprises an antenna 21, a radio transmission / reception device 22, a neighboring radio zone information updating device 23, a neighboring radio zone information storage device 24, a location registration. Area determination device 25, location registration area storage device 26, wired transmission / reception device 5
1 and a paging traffic measurement device 52. That is, a wired transmission / reception device 51 and a paging traffic measurement device 52 are added to the radio base station BSi shown in FIG. The function of the location registration area notification device 27 in FIG. 5 is included in the wireless transmission / reception device 22 in FIG. The wired transmission / reception device 51 transmits / receives a signal to / from the circuit exchange 4. The paging traffic measurement device 52 measures the traffic of the paging signal in the signal received by the wired transmission / reception device 51 from the circuit exchange 4. This measurement result and FIG.
In accordance with the corresponding rule shown in (1), the location registration area determination device 52 stores the wireless zone identifiers ZS in the location registration area storage device 26 by the number n of the wireless zones Z constituting the location registration area PAi of the own station. The neighboring wireless zone information storage device 24 holds the route information in a data format shown in FIG. 6 as an example. Then, the appearance frequency of the identifier ZSx of the wireless zone Zx included in the route information is calculated, and this is stored as frequency information. The frequency information serves as original data for determining the own location registration area PAi. Other unexplained components are the radio base station BSi shown in FIG.
Has the same function as and executes.

Referring to FIG. 17, an example of a rule followed by location registration area determining device 25 is that, when paging traffic increases, the size of the location registration area, ie, belonging to location registration area PAi based on this radio base station BSi. The number of radio base stations BS decreases. In a certain call traffic range, the number of radio base stations belonging to the location registration area is constant.

Referring to FIG. 18, the radio base station BSi according to the fifth embodiment of the present invention comprises an antenna 21, a radio transmission / reception device 22, a neighboring radio zone information updating device 23, a neighboring radio zone information storage device 24, a location registration. Area determination device 25, location registration area storage device 26, wired transmission / reception device 5
1 and a location registration signal traffic measuring device 61. That is, in the radio base station BSi shown in FIG. 16, the location registration signal traffic measuring device 61 is replaced with the paging traffic measuring device 52. The location registration signal traffic measuring device 61 measures the traffic of the location registration signal from the mobile device, which is received by the wireless transmission / reception device 22.
According to the measurement result and the corresponding rule as shown in FIG. 19, the location registration area determination device 25 stores the wireless zone identifiers ZS for the number n of the wireless zones Z constituting the location registration area PAi of the own station in the location registration area. It is stored in the device 26. Other components not described have and perform the same functions as the radio base station BSi shown in FIG.

Referring to FIG. 19, an example of a rule followed by location registration area determining device 25 is that, when the traffic of the location registration signal increases, the size of the location registration area, that is, the location registration area based on this radio base station BSi. The number of wireless base stations BS belonging to PAi increases. Within a certain location registration signal traffic range, the number of wireless base stations belonging to this location registration area is constant.

Referring to FIG. 20, the radio base station BSi according to the sixth embodiment of the present invention comprises an antenna 21, a radio transmission / reception device 22, a nearby radio zone information updating device 23, a nearby radio zone information storage device 24, a location registration. Area determination device 25, location registration area storage device 26, wired transmission / reception device 5
1 and a traffic measuring device 61. The traffic measuring device 71 is a radio base station B shown in FIG.
It has both the function of the Si paging traffic measuring device 52 and the function of the location registration signal traffic measuring device 61 of the radio base station BSi shown in FIG.

As a first measurement, the traffic measuring device 71 measures the traffic of the paging signal in the signal received by the wired transmitting / receiving device 51 from the circuit exchange 4. And
According to the corresponding rule as shown in FIG. 21, if the measurement result exceeds a predetermined threshold value E0, the position registration area determination device 25 sets the Z of the wireless zone constituting the position registration area PAi of its own station. Is reduced by one.

FIG. 21 shows that the size of the location registration area PA is reduced by one when the traffic of the call signal exceeds the threshold value E0.

At the same time as the first measurement, the traffic measurement device 71 measures the traffic of the location registration signal from the signal received by the radio transmission / reception device 22 as a second measurement. Then, according to the corresponding rule as shown in FIG. 22, if the measurement result exceeds a predetermined threshold value E1, the position registration area determination device 25 determines the radio zone Z of the position registration area PAi of the own station. Increase the number n by one. As described above, the location registration area determination device 25 determines the number n of the wireless zones Z constituting the location registration area PAi of the own station, and determines the number n of the wireless zones Z from the neighboring wireless zone information storage device 24 in descending order of frequency. , The identifier ZS of the wireless zone Z is stored in the location registration area storage device 26. The above two traffic measurements are periodically performed, and the location registration area determination device 25 determines whether to increase or decrease the number of wireless zones Z constituting the location registration area PAi for each measurement.

FIG. 22 shows that the size of the location registration area PA is increased by one when the traffic of the location registration signal exceeds the threshold value E1.

The location registration area setting method for reducing the number of radio zones Z included in the location registration area PAi when the traffic of the call signal exceeds a certain threshold value can be applied to the fourth embodiment of the present invention. The location registration area setting method for increasing the number of wireless zones included in the location registration area PAi when the traffic of the location registration signal exceeds a certain threshold can be applied to the fifth embodiment of the present invention.

As described above, in the fourth to sixth embodiments, similarly to the first to third embodiments, each radio base station receives the route information received from the mobile station that has performed location registration in its own radio zone. , The location registration area is set independently, and an overlapping location registration area is realized. At the same time, the radio base stations of the fourth to sixth embodiments provide the paging traffic
The size of the location registration area based on the own radio base station is changed according to the amount of the location registration signal traffic, so that the load is not concentrated on some of the radio base stations, and the Load distribution can be performed for this.

[0084]

As described above, the present invention has an effect that the control traffic for the position registration can be reduced by setting the overlapped position registration areas in an independent and distributed manner. In addition, by learning the route information of the mobile device, the wireless base station considers the possibility of movement of the mobile device, and thus, an efficient location registration area in which the mobile device does not need to perform location registration frequently is provided. Can be set. Further, the method in which the wireless base station retains its own location registration area information eliminates the need for the circuit switching station to retain the information on the location registration area, and has the effect of reducing the load on the circuit switching station. Such an effect can be further enhanced by changing the size of the self-location registration area in accordance with the control traffic in each wireless base station, and the load of each wireless base station can be dispersed. In addition, in order to change the size of the location registration area in the wireless base station under a predetermined condition, the number of wireless zones belonging to the location registration area is notified to the mobile station as location registration area information. Can accurately receive the location registration area signal. Further, the mobile device can determine the necessity of location registration based on the location registration area signal from the wireless base station, and can reduce control traffic for location registration.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a mobile communication system according to the present invention.

FIG. 2 is a diagram showing a signal sequence flow for location registration transmitted and received between a radio base station and a mobile device in the first embodiment.

FIG. 3 is a configuration example of a signal shown in FIG. 2;

FIG. 4 is a functional block diagram of an example of a mobile device according to the first embodiment.

FIG. 5 is a functional block diagram illustrating an example of a wireless base station according to the first embodiment;

FIG. 6 is a diagram illustrating an example of data of a wireless zone identifier held by a wireless base station according to the present invention.

FIG. 7 is a flowchart illustrating a location registration operation of the mobile device shown in FIG.

FIG. 8 is a flowchart illustrating a position registration operation of the wireless base station shown in FIG.

FIG. 9 is a signal sequence flow for location registration transmitted and received between a wireless base station and a mobile device in the second embodiment.

FIG. 10 is a configuration example of a signal shown in FIG. 9;

FIG. 11 is a functional block diagram of an example of a mobile device according to the second embodiment.

FIG. 12 is a flowchart illustrating a location registration operation of the mobile device shown in FIG.

FIG. 13 is a system configuration diagram of a third embodiment.

FIG. 14 is a functional block diagram illustrating an example of a wireless base station according to a third embodiment;

FIG. 15 is an example of location registration data held by a circuit exchange in the third embodiment.

FIG. 16 is a functional block diagram illustrating an example of a wireless base station according to a fourth embodiment;

17 is a diagram showing an example of a rule followed by a location registration area determining device of the wireless base station of FIG.

FIG. 18 is a functional block diagram illustrating an example of a wireless base station according to a fifth embodiment;

FIG. 19 is a diagram showing an example of a rule followed by the location registration area determining device of the wireless base station of FIG.

FIG. 20 is a functional block diagram illustrating an example of a wireless base station according to a sixth embodiment;

FIG. 21 is a diagram illustrating a first example of a rule followed by a location registration area determination device of the wireless base station in FIG.

FIG. 22 is a diagram illustrating a second example of a rule followed by the location registration area determination device of the wireless base station in FIG.

FIG. 23 is an explanatory diagram of a conventional location registration method having a location registration area where wireless zones overlap.

FIG. 24 is a flowchart illustrating a location registration operation in a mobile device of a conventional mobile communication system having overlapping location registration areas.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 mobile device 2 radio circuit controller 3 public line network 4 circuit switching station 5 bus 11 and 21 antenna 12 and 22 wireless transmitting and receiving device 13 location zone location registration area extraction device 14 location registration area storage device (mobile device) 15 route information Creation storage device 16 Location registration signal generation device 23 Nearby wireless zone information updating device 24 Nearby wireless zone information storage device 25 Location registration area determination device 26 Location registration area storage device (wireless base station) 27 Location registration area notification device 31 Location registration wireless Zone storage device 41 Position information transmission / reception device 42 Data comparison device 43 Location registration area storage device 51 Wired transmission / reception device 52 Call traffic measurement device 61 Location registration signal traffic measurement device 71 Traffic measurement device Zi, Zx, Zy Wireless zone BSi In wireless zone Zi The wireless base station to which it belongs Pi, PAi Location registration area MSi Identifier of mobile station i ZSi, ZSx, ZSy Wireless zone Zi, Zx, Z
y identifier a1 wireless zone identification number (ID) signal b1, b2 location registration signal c1, c2 location registration confirmation signal d1, d2 location registration area signal

 ──────────────────────────────────────────────────続 き Continued on the front page (31) Priority claim number Japanese Patent Application No. 2-416937 (32) Priority date Hei 2 (1990) December 28 (33) Priority claim country Japan (JP) (31) Priority Claim No. Japanese Patent Application No. 2-416938 (32) Priority Date Hei 2 (1990) December 28 (33) Priority Claiming Country Japan (JP)

Claims (7)

(57) [Claims] 1. A wireless base station arranged corresponding to each of a plurality of wireless zones set so as to cover a service area and capable of communicating with a mobile station via a wireless line, including its own wireless zone. In a radio base station including means for notifying a set of one or more radio zones to the mobile station as a location registration area of the mobile station belonging to the own radio zone, the notifying means includes the location registration area and the location registration area A radio base station comprising means for notifying a mobile station of the number of radio base stations arranged corresponding to one or a plurality of radio zones included in an area. 2. A means for determining the number of radio base stations arranged corresponding to one or a plurality of radio zones included in the location registration area, independently of other radio base stations, and informing the mobile station of the number. The radio base station according to claim 1, comprising: 3. A wireless base station arranged corresponding to each of a plurality of wireless zones set to cover a service area and capable of communicating with a mobile station via a wireless line, including its own wireless zone. Means for setting a collection of one or more wireless zones as a location registration area of a mobile station belonging to the own wireless zone;
Means for transmitting identification information for identifying one of the wireless zones to the mobile station as a location registration area signal. 4. A mobile station capable of communicating via a radio line with a radio base station arranged corresponding to a plurality of radio zones set so as to cover a service area. A mobile station, comprising: means for transmitting information indicating a wireless zone that has passed up to the wireless base station as route information. 5. A wireless base station arranged corresponding to each of a plurality of wireless zones set to cover a service area, and a mobile device capable of communicating with the wireless base station via a wireless line. In the mobile communication system, the wireless base station includes: a unit that sets a group of one or more wireless zones including its own wireless zone as a location registration area of the mobile device belonging to the own wireless zone; Means for transmitting identification information for identifying at least one radio zone to be configured to the mobile device as a location registration area signal, wherein the mobile device is configured based on the location registration area signal transmitted from the wireless base station. A mobile communication system comprising means for determining the necessity of location registration by using a mobile phone. 6. The mobile communication system according to claim 5, wherein said wireless base station includes means for changing a wireless zone included in said location registration area based on information transmitted from said mobile device. 7. The mobile station includes means for notifying the radio base station of information on a radio zone which has been passed so far when performing location registration as route information, wherein the radio base station notifies the radio base station of the information from the mobile station. The mobile communication system according to claim 5, further comprising means for changing the location registration area based on the obtained route information.