JP2000013846A - Position registering method for roaming of portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily register an allocated radio call code by designating a system call code of a roaming enable visitor independent mobile exchange of a portable telephone set via a station independent mobile exchange in a position registering mode. SOLUTION: A visitor station independent mobile exchange identifies the success of authentication from a received authentication answer signal 26 and transmits a position information registering request signal 27 to a home station independent mobile exchange 100. The exchange 100 updates the contents of information including a proper call code, an extension number, an authentication key, a maintenance operation key, various service information and the position information to specify a portable telephone set 1 contained in the exchange 100 and also reads out the roaming destination information. Then a system call code of a newly established visitor station independent mobile exchange which is included in the roaming destination information is added to obtain a position information registering answer signal 29a that is sent back to the visitor station independent mobile exchange.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a location registration in roaming of a portable telephone for registering a system call code in a private digital cordless telephone (hereinafter referred to as "portable telephone") in a second generation cordless telephone system. It is about the method.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a configuration diagram showing a conventional mobile phone system disclosed in Japanese Patent Publication No. 7-107, in which 600 denotes a mobile phone 900;
Home office private exchange, which is a private branch exchange of the home station in which various data for specifying the location are registered, 601 is a home location register in which data such as location information indicating the current position of the mobile phone 900 is registered, and 610 is a home office. A line control device that controls communication performed between the private branch exchange 600 and the wireless base station device 620 via a communication line. A wireless base station device 620 is a base station for transmitting and receiving signals to and from the mobile phone 900 by wireless communication. , 630 are service areas in which the mobile phone 900 can communicate with the wireless base station device 620.

[0003] Also, 700 and 800 are visitor private exchanges, which are other private exchanges connected to the home private exchange 600 via a communication line, and 701 and 801 are mobile telephone private exchanges 700 and 800, respectively.
And a visitor location register 710 and 810 for holding roaming information obtained by roaming, respectively, via the communication line between the visitor station private branch exchange 700 and the wireless base station apparatus 720 and between the visitor station private branch exchange 800 and the wireless base station apparatus 820. Line control device for controlling communication
Reference numerals 20 and 820 denote wireless base station devices for transmitting and receiving signals to and from the mobile phone 900 by wireless communication, reference numerals 730 and 830 denote service areas in which the mobile phone 900 can communicate with the wireless base station devices 720 and 820, Reference numeral 900 denotes a movable mobile phone.

Next, the operation will be described. Home office private branch exchange 600 and visitor office private branch exchanges 700 and 800
Are connected to each other by a communication line, and have a home location register 60 provided in the home office private branch exchange 600.
1 and the data of the visitor location registers 701 and 801 provided in the visitor private branch exchanges 700 and 800, respectively.

Next, the operation of location registration of the portable telephone 900 by this conventional portable telephone location registration system will be described. Service area 83 of visitor private branch exchange 800
When the mobile phone 900 located in the location 0 moves into the service area 730 of the visitor private branch exchange 700, the mobile phone 900 is constantly transmitted from the visitor private branch exchange 700 via the line control device 710 and the wireless base station device 720. Second generation cordless telephone system standard (RESEARCH AND DEV)
ELOPMENT RADIO SYSTEM STA
Detects a plurality of radio call codes including a system call code and an additional identification number specified in NDARD-28 (hereinafter, referred to as “RCR-STD-28”).

If the detected paging code is different from the paging code received from the radio base station device 820 in the service area 830 of the visitor private branch exchange 800 located before the movement, and is registered in the mobile telephone 900 in advance. If there is a matching radio call code among a plurality of radio call codes, the mobile phone 900 sets
20 and sends a location registration request signal to the visitor private branch exchange 700.

[0007] The visitor station private branch exchange 700 transmits the location registration request signal sent from the portable telephone 900 to the radio base station apparatus 7.
20 and the line control device 710, and detects the radio call code of the mobile phone 900 included in the received position registration request signal, and transmits an information acquisition request signal including the detected radio call code via the communication line. Home office private branch exchange 60
Send to 0. In response to the information acquisition request signal, home office private branch exchange 600 returns an information acquisition response signal including authentication necessary information including a call code and an authentication key unique to mobile phone 900 to visitor office private branch exchange 700 via a communication line. I do.

A home office private branch exchange 60 via a communication line
When the visitor private branch exchange 700 receives the information acquisition response signal from 0, the line control device 710 and the radio base station device 72
0, an authentication request signal including an authentication key and an authentication random number is transmitted to the mobile phone 900, and the mobile phone 900 converts the received authentication key and authentication random number into a predetermined authentication key using a predetermined authentication operation formula. And returns an authentication response signal including authentication success information to the visitor private branch exchange 700.

[0009] The visitor private branch exchange 700 identifies successful authentication from the received authentication response signal, and sends a location registration request signal to the home private branch exchange 600. Based on the location information registration request signal transmitted from the visitor private branch exchange 700, the home private branch exchange 600 sends a call code unique to the mobile phone 900 in the home location register 601;
It updates the contents of the mobile phone information including the extension number, authentication key, maintenance operation key, various service information, and location information, and returns a location registration information response signal to the visitor office private branch exchange 700.

As a result, the fact that portable telephone 900 has moved from service area 830 of visitor office private branch exchange 800 to service area 730 of visitor office private branch exchange 700 is registered in home location register 601 of home office private branch exchange 600.

Upon receiving the location registration information response signal from home office private branch exchange 600, visitor office private branch exchange 700 newly registers the portable telephone information of portable telephone 900 in visitor location register 701 and registers the position of portable telephone 900 with respect to portable telephone 900. Sends a registration acceptance signal.

[0012] Further, the home office private branch exchange 600 performs an erasure process for erasing the portable telephone information of the portable telephone 900 registered in the visitor location register 801 with the visitor office private branch exchange 800, and the erasure is completed. It is assumed that the registration of the roaming information in the visitor private branch exchange 700 of the mobile phone 900 has been completed.

[0013]

Since the conventional location registration method for roaming a mobile phone is configured as described above, in order for a mobile phone to request location registration at a roaming destination, an RCR-STD- It is necessary to register a plurality of radio call codes consisting of a system call code and an additional identification number specified in No. 28 internally. Therefore, when a new visitor exchange is installed, the mobile phone is re-wired to the mobile phone again. You need to create a call sign,
Each time the number of visitor private branch exchanges increases, it is necessary to re-register the radio call code in the mobile phone.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. Even when a new exchange (visitor exchange) is newly installed in a portable telephone system, a radio call newly assigned to the portable telephone is set. It is an object of the present invention to obtain a location registration method in roaming of a portable telephone mainly comprising a portable device, which can easily register a code.

[0015]

According to the present invention, there is provided a location registration method for roaming a portable telephone, which comprises, at the time of location registration, a system call code of a plurality of roaming visitor private mobile exchanges capable of roaming the portable telephone. From the mobile switchboard.

According to the location registration method for roaming of a portable telephone according to the present invention, a roaming-capable system call code is designated by a visitor station private mobile switchboard at the time of location registration.

According to the present invention, there is provided a location registration method for roaming a portable telephone, wherein the mobile station for private use at the visitor station has a mobile area for home station use or a mobile station for private use at the visitor station having a service area adjacent to its own service area. Only the system call code of the body exchange is transmitted to the mobile phone, and the mobile phone calculates the difference between the system call codes received at the time of accepting the location registration, restores the complete system number based on a predetermined arithmetic expression, and executes the system call. This is stored in the code management table.

According to the location registration method for roaming of a portable telephone according to the present invention, only one system call code is stored in advance in a system call code management table of the portable telephone, and a plurality of visitor station private mobile exchanges are used. The system call code stored in the system call code management table of the mobile phone is transmitted to the mobile phone as a notification signal, and the mobile phone determines whether or not the mobile station can be roamed by itself and is located in the service area of the mobile station private mobile exchange. A registration request is made.

According to the position registration method for roaming of a portable telephone according to the present invention, the system call code management table of the portable telephone is stored in a column for storing the system code of the mobile station exchange for the visitor station whose position has been registered. The mobile phone stores the system code of the visitor station private mobile switchboard that could not be registered in the system call code management table. When the system call code stored in the corresponding field is received, the location registration operation is not performed any more in the service area.

A location registration method for roaming a portable telephone according to the present invention is to delete the oldest stored system call code and store a new system call code when updating the system call code management table of the portable telephone. It is.

According to the location registration method for roaming of a portable telephone according to the present invention, no system call code is stored in an initial state in a system call code management table of the portable telephone. Even if an authentication mismatch is identified from the authentication response signal received from the mobile phone, a location registration reception signal is transmitted to the mobile phone, and the mobile phone can roam the mobile office of the visitor office receiving this location registration reception signal. As a mobile station exchange for a private visitor station, the system call code is stored in a system call code management table.

In the location registration method for roaming of a portable telephone according to the present invention, a plurality of visitor station private mobile exchanges transmit information including information indicating whether or not roaming is possible in the notification signal.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a configuration diagram for explaining in principle the case where the location registration method for roaming a mobile phone according to the first embodiment of the present invention is applied to a second generation cordless telephone system. In the figure, 1 is a mobile phone, 100 is a home office private mobile exchange which is an exchange of a home office in which various data for specifying the mobile phone 1 are registered, and 110 is a home office private mobile exchange 100. A wireless base station apparatus which is a base station which is connected and exchanges signals with the mobile phone 1 by wireless communication. Reference numeral 120 denotes a service area which is an area where the mobile phone 1 can communicate with the wireless base station apparatus 110. .

Reference numerals 200 and 300 denote other mobile stations connected to the home station mobile switching center 100 via a communication line, and the visitor station mobile switching boards 210 and 31.
Reference numeral 0 denotes a wireless base station device which is connected to the visitor station private mobile switching units 200 and 300, respectively, and exchanges signals with the mobile phone 1 by wireless communication. , A visitor station private mobile switch 400 which is a newly installed switch, 410 is connected to the visitor station private mobile switch 400 and communicates with the mobile phone 1 by wireless communication. A wireless base station device that performs transmission and reception, 420 is a service area that is an area where the mobile phone 1 can roam with the wireless base device 410, 101, 201, and 3
01 and 401 are privately owned mobile switchboards 100, 200 and 3
System call codes (system call codes defined in RCR-STD-28) respectively assigned to 00 and 400, and 102, 202, 302 and 402 are provided in the private mobile exchanges 100, 200, 300 and 400, respectively. This is a roaming destination information storage area which is an area for storing roaming destination information.

Next, the operation will be described. FIG. 2 shows that after a visitor station private mobile switch 400 is newly installed,
FIG. 9 is a sequence flowchart showing a sequence in which the mobile phone 1 moves from the service area 120 of the home station mobile switching center 100 to the service area 320 of the visitor station mobile switching center 300 and completes location registration. . In the figure, reference numeral 50 denotes a system call code management table provided in the mobile phone 1, which represents a state before the mobile phone 1 moves to the service area 320 of the visitor station mobile switching center 300. Reference numeral 51 denotes the same system call code management table, which represents a state after the mobile phone 1 has moved to the visitor station mobile switching center 300 and the location registration has been completed. 32 is RCR-STD-28
This is an optional information element of the location registration reception signal format specified in.

First, as in the conventional example, when the mobile phone 1 located in the service area 120 of the home station mobile switching center 100 moves into the service area 320 of the visitor station mobile switching center 300, the mobile phone 1 Is the mobile station switching system 300 for the visitor station.
A plurality of radio call codes including a system call code and an additional identification number defined in RCR-STD-28 included in the broadcast signal 21 which is constantly transmitted through the wireless communication device 10 are detected.

The system call code portion of the radio call code detected by the mobile phone 1 is transmitted from the radio base station apparatus 110 in the service area 120 of the home office mobile switching center 100 where the mobile phone 1 was located before moving. If the system call code is different from the system call code in the received radio call code, and if there is a matching system call code among a plurality of system call codes registered in advance in the system call code management table 50 of the mobile phone 1, The mobile phone 1 accesses the destination wireless base station apparatus 310 and sends out a location registration request signal 22 to the visitor station private mobile exchange 300.

As in the prior art, the visitor station private mobile exchange 300 detects the radio call code of the mobile phone 1 contained in the location registration request signal 22 transmitted from the mobile phone 1, and detects the detected radio call code. Acquisition request signal 2 including
3 through the communication line to the home office private mobile exchange 100
In response to the transmitted information acquisition request signal 23, the home station private mobile exchange 100 transmits an information acquisition response signal 24 including authentication required information including a unique call code of the mobile phone 1 and an authentication key. Visitor station private mobile switchboard 30
0 is returned via the communication line.

Upon receiving the information acquisition response signal 24 from the home office private mobile exchange 100 via the communication line, the visitor office private mobile exchange 300 sends an authentication request including an authentication key and an authentication random number to the mobile phone 1. The mobile phone 1 transmits a signal 25, authenticates the received authentication key and authentication random number with a predetermined authentication key using a predetermined authentication operation formula, and sends an authentication response signal 26 including authentication success information to the mobile station for mobile use. Return to body exchange 300.

The visitor station private mobile exchange 300 identifies the successful authentication from the received authentication response signal 26, and sends a location information registration request signal 27 to the home station private mobile switch 100. Home station mobile switching center 100
Is based on the location information registration request signal 27 transmitted from the visitor station private mobile exchange 300, based on the unique call code, extension number, authentication key, and maintenance code of the mobile phone 1 in the home station private mobile exchange 100. The content of the information for specifying the mobile phone including the operation key, various service information, and the location information is updated, the roaming destination information is read (step ST28), and the newly established visitor included in the read roaming destination information is read. The location information registration response signal 2 including the system call code of the mobile switching center 400
As 9a, it is returned to the visitor station mobile switching center 300.

As a result, the fact that the mobile telephone 1 has moved from the service area 120 of the home station private mobile exchange 100 to the service area 320 of the visitor station private mobile exchange 300 is registered in the home station private mobile exchange 100. Is done.

Upon receiving the location information registration response signal 29a from the home station private mobile exchange 100, the visitor office private mobile exchange 300 performs a registration process for storing the information of the mobile phone 1 in the roaming destination information storage area 302. (Step ST30a), and at the same time, the fact that the location registration has succeeded with respect to the mobile phone 1 and the system call code capable of roaming at present are transmitted as the location registration acceptance signal 31.
In the first embodiment, a system call code is inserted into the option information element 32 of the location registration reception signal format and transmitted.

The mobile phone 1 that has received a plurality of system call codes at the timing of the position registration acceptance signal 31 stores these system call codes in the system call code management table 50 stored in the system call code management table 50 of the current mobile phone 1. When there is a new information element,
It is assumed that a new exchange is installed in the system, and the system call code management table 50 is updated to the system call code management table 51.

As a result, the portable telephone 1 is placed in the service area 42 of the newly installed mobile station 400 for the visitor station.
When the mobile station 400 moves to 0, it is already in the system call code management table as the business office D and the mobile station 400
Is registered, the location of the mobile phone 1 is registered in the visitor station private mobile exchange 400 in the same manner as when roaming to another visitor station private mobile switch 300, and the service area At 420, the mobile phone 1 can be used.

As described above, according to the first embodiment, even when a new business establishment is opened and a new mobile station for private use of a visitor station is set, the system call code of the business establishment is set in advance. Even if it is not registered in the mobile phone, it is possible to obtain an effect that it is possible to roam with an existing office by roaming with an existing office.

Embodiment 2 FIG. 3 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 2 of the present invention. 3, the same components as those in the sequence flowchart of FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

Next, the operation will be described. In the second embodiment, the home station private mobile switch 100
Updates the content of the information for specifying the mobile phone 1 without adding the roaming destination information, and returns it to the visitor station private mobile switchboard 300 as the location information registration response signal 29b. Visitor station private mobile switchboard 30
0 reads the station configuration information on the network between the exchanges updated by the connection of the new visitor station private mobile exchange 400 (step ST30b), and reads the visitor station private mobile read as a result. Exchange 400
, And sends it to the mobile phone 1 as a location registration acceptance signal 31.

As described above, according to the second embodiment, the same effect as in the first embodiment can be obtained without the home station mobile switching center reading the roaming destination information.

Embodiment 3 FIG. 4 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 3 of the present invention. 4, the same components as those in the sequence flowchart of FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 4, reference numeral 52a denotes a system call code management table provided in the mobile phone 1, which represents an initial state. The system call code management table 52a in the initial state stores only one predetermined system call code common to each business establishment (this is the system call code of the business establishment 0). 52b indicates that the portable wireless device 1 is a business establishment A, B, C
3 shows a system call code management table after roaming in each of the service areas 120, 220, and 320, and stores a system call code unique to each office. Reference numeral 53 denotes a system call code management table after the mobile phone 1 has roamed with the newly established office D. The system call code management table 53 stores the system call code of the office D. 33 is an annunciation signal 21a transmitted to the mobile phone 1 by the visitor station private mobile exchange 400.
This is an option information broadcast signal transmitted in a format specified by RCR-STD-28, and the business establishment 0 commonly set as this option information broadcast signal 33
Is transmitted.

Next, the operation will be described. In the third embodiment, each of the home / visitor office private mobile exchanges 100, 200, 300, and 400 includes an RCR-STD.
A common system call code is transmitted to the mobile phone 1 using the option information notification signal 33 specified by -28. In FIG. 4, the service area 120, 220, 320 of the home station mobile switching center 100 and the visitor station mobile switching center 200, 300 is moved, and the home station mobile switching center 100, the visitor station mobile station are moved. Body exchange machine 2
This shows a location registration sequence when the mobile phone 1 that has roamed to 00, 300 has moved to the service area 420 of the newly installed visitor station mobile switching center 400. The mobile phone 1 that has moved to the service area 420 of the visitor station private mobile exchange 400 is transferred from the visitor station private mobile switch 400 to the wireless base station device 41.
0 from among the annunciation signals that are always transmitted through RCR-
An option information notification signal 33 transmitted in a format specified by STD-28 is detected. The mobile phone 1 that has received the option information notification signal 33 compares the system call code of the office 0 in the option information notification signal 33 with the system call code stored in the system call code management table 52b in advance. Since the same system call code exists, the visitor station private mobile switch 40
A position registration request signal 22 is sent to 0 to make a position registration request. As a result, if the location registration succeeds, the system call code management table 52b is updated, and the position registration is completed as the system call code management table 53 storing the system call code of the office D.

As described above, according to the third embodiment, the home station private mobile exchange and the visitor station private mobile exchange detect the station configuration in the network in the same manner as in the first embodiment. The effect of is obtained.

Embodiment 4 FIG. 5 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 4 of the present invention. 5, the same components as those in the sequence flowchart of FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 5, reference numeral 54a denotes a system call code management table provided in the mobile phone 1, and a column for storing a system call code of a business office for which location registration was not possible, and a system call code of a business office for which position registration was possible. Is stored, and the case where the mobile phone 1 has successfully roamed in the service areas 120, 220, and 320 of the offices A, B, and C is shown. Reference numeral 55a denotes a system call code management table after the mobile phone 1 has failed in roaming with the office D.

In the third embodiment, only system call codes that can be roamed are provided and managed as a management table. In the fourth embodiment, a location registration request more than necessary is transmitted each time the mobile phone 1 moves. In order to avoid this, the system call code management table is divided into two areas of location registration success (OK) and failure (NG),
This is to prevent unnecessary location registration.

Next, the operation will be described. FIG. 5 shows a service area 420 of the visitor station private mobile switch 400.
9 shows a location registration sequence in the case where the mobile station 1 is set to be unusable in the mobile switching center 100 for private use of the home station. A mobile switching center 4 for private use of a visitor station receiving a location registration request signal 22 from the mobile phone 1
00 exchanges an information acquisition request signal 23 and an information acquisition response signal 24 with the home station private mobile exchange 100.

Next, the mobile station switching system 400 for the visitor station
Exchanges an authentication request signal 25 and an authentication response signal 26 with the mobile phone 1, identifies an authentication mismatch from the received authentication response signal 26 (step ST 34), and sends a location registration acceptance rejection signal to the mobile phone 1. 31a is sent out. As a result, information indicating that roaming is not possible in the service area 420 of the visitor station private mobile switching system 400 is clearly transmitted to the mobile phone 1.

Upon receiving the position registration acceptance rejection signal 31a, the portable telephone 1 places the visitor station private mobile switch 40 in the position registration failure (NG) column of the system call code management table.
Register the system call code of 0. As a result, even if the mobile phone 1 moves to the service area 120 of the home station mobile switching center 100 and then to the service area 420 of the visitor station mobile switching center 400 again, the mobile station 1 does not move. It is detected that the system call code received from the broadcast signal constantly transmitted from the exchange 400 via the radio base station apparatus 410 is the service area 420 in which the location registration has failed, and an unnecessary location registration sequence is executed. No need to try.

As described above, according to the fourth embodiment, meaningless communication can be prevented, and the effect of efficiently determining whether to roam can be obtained.

Embodiment 5 FIG. FIG. 6 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 5 of the present invention. 6, the same components as those in the sequence flowchart of FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 6, reference numeral 36 denotes an optional information element of a location registration reception signal format defined in RCR-STD-28,
Homes of business establishments A and D whose service areas are set adjacent to the service area of the visitor office private mobile exchange 300 of the business office C with which the mobile phone 1 is currently communicating, and the visitor office private mobile exchange. The system call codes 100 and 400 are registered as option information elements together with the system call codes of the visitor station private mobile switch 300.

In the second embodiment, the mobile station switching system 300 for the visitor station uses the read out system configuration codes included in the station configuration information on the network between the exchanges as all the location registration acceptance signals 31 to the mobile phone 1. According to the fifth embodiment, when the mobile phone 1 has a function of storing the difference, the mobile station 3
00 transmits only the adjacent system call code as the location registration acceptance signal 31b.

Next, the operation will be described. Embodiment 2
Similarly to the case described above, the home station mobile switching center 100 updates the content of the information for specifying the mobile phone 1 without adding the roaming destination information, and generates a location information registration response signal 29b. Mobile switchboard 300
Return to The visitor station private mobile exchange 300 reads out the station configuration information on the network between the exchanges updated by the connection of the new visitor station private mobile exchange 400 (step ST30b), and the visitor station private mobile. The system call codes of the home and visitor station private mobile switchboards 100 and 400 whose service areas are adjacent to the service area 320 of the mobile switchboard 300, together with the system call code of the visitor station private mobile switchboard 300, are transmitted to the location registration acceptance signal. Mobile phone 1 as 31b
To send to.

On the mobile phone 1 side, the difference between the received system call code of the visitor station private mobile exchange 300 and the system call code of the home and visitor station private mobile exchanges 100 and 400 is calculated, and a predetermined calculation is performed. Based on the formula, it is restored as a complete system number of each office, and written and stored in the system call code management table. In the example of FIG. 6, the system call code of the newly established establishment D is restored by the above calculation and added to the system call code management table.

As described above, according to the fifth embodiment, even if the network configuration is large-scale, the location registration reception signal requires a fixed amount of data, so that the location registration reception signal can be transmitted efficiently. Is obtained.

Embodiment 6 FIG. FIG. 7 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 6 of the present invention. 7, the same components as those in the sequence flowchart of FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 7, reference numeral 54b denotes a system call code management table provided in the mobile phone 1, and a column for storing a system call code of a business office for which position registration was not possible, and a system call code of a business office for which position registration was possible. And has a predetermined buffer size. Reference numeral 55b denotes a system call code management table after the mobile phone 1 has successfully roamed with the office D.

Next, the operation will be described. In the sixth embodiment, the system call code management table is used efficiently, and the system call code management table 55 is used.
b, the system call codes other than the initial system call code (system call code of the office 0) and the system call code of the home station (the system call code of the office A), which are defined in advance, are sequentially arranged in the chronological order. A new system call code is added while deleting. That is, in addition to the initially set system call code of the office 0, the system call codes of the offices A, B, and C that have roamed thereafter are stored in the system call code management table 54b, and the roaming of the system call code management table 54b is performed. Assuming that the field for storing the possible system call codes is already full, if the mobile phone 1 has successfully roamed with the newly installed office D, the oldest roaming successful in the system call code management table 54b will be performed. The system call code of the office B is deleted, and the system call code of the office D that has successfully roamed is newly registered as in the system call code management table 55b.

The system call code management table 55
b stores the system call code of the office D at the position of the system call code of the office B in the system call code management table 54b. This means that the new system call code is physically stored at the same address in the memory. Does not mean that the system call code must be stored, and the address of the system call code of each business office may be sequentially shifted so as to erase the oldest system call code like a shift register. .

As described above, according to the sixth embodiment, an effect is obtained that a system call code management table of a predetermined size can be effectively used.

Embodiment 7 FIG. FIG. 8 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 7 of the present invention. 8, the same components as those in the sequence flowchart of FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 8, reference numeral 56 denotes a system call code management table provided in the mobile phone 1, and a column for storing a system call code of a business office for which location registration was not possible, and a system call code of a business office for which location registration was possible. The system call code of the establishment whose location has been registered does not store any system call code in advance and can be roamed under any private mobile exchange. It is a so-called global setting. Therefore, a column in the system call code management table for storing the system call code of the establishment whose location has been registered is hereinafter referred to as a global setting column. Reference numeral 57 denotes a system call code management table after the mobile phone 1 has failed in roaming with the office D.

Next, the operation will be described. Mobile phone 1
Succeeds in roaming with the establishment A and enters the service area 420 of the newly established establishment D with the system call code of the establishment A entered in the global setting column in the system call code management table 56. Assuming that
As a result of the exchange of the authentication request signal 25 and the authentication response signal 26 with the mobile phone 1, the visitor station private mobile exchange 400 of the establishment D identifies the authentication mismatch from the received authentication response signal 26 (step ST 34). . However, even in this case, the visitor station private mobile exchange 400 transmits the location registration acceptance signal 31 to the mobile phone 1, and the mobile phone 1 receives the location registration acceptance signal 31 and sends the location registration acceptance signal 31 to the mobile station 1. The system call code 400 is stored in the global setting column of the system call code management table 56 as a visitor station private mobile switchboard capable of roaming.

As described above, according to the seventh embodiment, even if the system call code is not previously written in the system call code management table of the portable telephone, the mobile station exchange system for the newly installed visitor station can be used. The effect that roaming becomes possible is obtained.

Embodiment 8 FIG. FIG. 9 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 8 of the present invention. 9, the same components as those in the sequence flowchart of FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 9, reference numeral 33b denotes an RCR-ST in an annunciation signal 21b sent to the mobile phone 1 by the visitor station private mobile exchange 400.
This is an option information notification signal transmitted in a format specified in D-28, and information indicating whether or not roaming is possible is transmitted as the option information notification signal 33b.

Next, the operation will be described. Mobile phone 1
When the mobile phone 1 enters the service area 420 of the visitor station private mobile exchange 400, the mobile phone 1 sends the broadcast signal 21 from the radio base station device 410 of the visitor station private mobile exchange 400.
b is received. Since the notification signal 21b includes roaming availability information, if the roaming is not possible, the mobile phone 1 sets the visitor station private mobile exchange 40
Cancels subsequent communication with 0.

As described above, according to the eighth embodiment, it is possible to obtain an effect that it is possible to prevent a useless location registration request from being sent to a visitor station private mobile switchboard that cannot roam.

[0063]

As described above, according to the present invention, at the time of location registration, a system call code of a plurality of roaming visitor private mobile exchanges of a portable telephone is designated by the home office private mobile exchange. Because it was configured as
Opening a new office and using a mobile phone within the service area of the new office without having to write a new system call code to the mobile phone, even if the network configuration is new There is an effect that can be done.

According to the present invention, at the time of location registration, the roaming-capable system call code is instructed from the visitor station private mobile exchange, so that the home station private mobile exchange reads the roaming destination information. In addition, there is an effect that the mobile phone can be used in the service area of the new office without the need to write a new system call code to the mobile phone.

According to the present invention, the visitor station private mobile switching center can change only the system call code of the home station private mobile switching center or the visitor station private mobile switching center having a service area adjacent to its own service area. The mobile phone transmits the difference between the system call codes received at the time of location registration reception, restores the complete system number based on a predetermined arithmetic expression, and stores the difference in the system call code management table. With this configuration, the location registration reception signal has a fixed amount of data even when the network configuration is large-scale, and has an effect that the location registration reception signal can be transmitted efficiently.

According to the present invention, only one system call code is stored in advance in the system call code management table of the portable telephone, and a plurality of mobile switching units for visitor stations can be used.
The system call code stored in the system call code management table of the mobile phone is transmitted to the mobile phone as a notification signal, and it is determined whether the mobile phone is in the service area of the mobile station mobile switching center capable of roaming by itself. Since the configuration is such that a location registration request is made, the home station private mobile exchange and the visitor station private mobile exchange do not detect the station configuration in the network and write a new system call code to the mobile phone. There is an effect that the mobile phone can be used in the service area of the new business office without requiring the mobile phone.

According to the present invention, the system call code management table of the portable telephone is stored in the column for storing the system code of the mobile station exchange for the personal office whose location has been registered, and the mobile station for the private mobile station whose location cannot be registered. The system is separated into a column for storing the system code of the mobile exchange, and the mobile phone is provided with a system stored in the column for storing the system code of the mobile station exchange for the visitor station which could not be registered in the system call code management table. When the call sign is received,
Since the location registration operation is not performed any more in the service area, meaningless communication can be prevented, and the roaming availability can be efficiently determined.

According to the present invention, when the system call code management table of the portable telephone is updated, the oldest stored system call code is deleted and a new system call code is stored. There is an effect that the system call code management table can be effectively used.

According to the present invention, no system call code is stored in the system call code management table of the portable telephone in the initial state, and the plurality of visitor station private mobile exchanges receive the authentication response signal received from the portable telephone. The mobile station transmits a location registration reception signal to the mobile phone even if it identifies the authentication mismatch from the mobile station, and the mobile phone can roam the visitor station mobile switching center that has received the location registration reception signal. The system call code is stored in the system call code management table. Therefore, even if the system call code is not written in the system call code management table of the mobile phone in advance, the newly installed visitor station can be used. There is an effect that it is possible to roam with a mobile switching center.

According to the present invention, since a plurality of visitor station private mobile exchanges are configured to transmit information indicating whether roaming is possible or not in the broadcast signal, the roaming-unaware visitor station private mobile switch is configured. There is an effect that it is possible to prevent unnecessary sending of the position registration request to the body exchange.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for describing in principle the case where a location registration method in roaming of a mobile phone according to a first embodiment of the present invention is applied to a second generation cordless telephone system.

FIG. 2 is a sequence flowchart showing a location registration method in roaming of the mobile phone according to Embodiment 1 of the present invention.

FIG. 3 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 2 of the present invention.

FIG. 4 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 3 of the present invention.

FIG. 5 is a sequence flowchart showing a position registration method in roaming of a mobile phone according to Embodiment 4 of the present invention.

FIG. 6 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 5 of the present invention.

FIG. 7 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 6 of the present invention.

FIG. 8 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 7 of the present invention.

FIG. 9 is a sequence flowchart showing a location registration method in roaming of a mobile phone according to Embodiment 8 of the present invention.

FIG. 10 is a configuration diagram showing a conventional mobile phone system.

[Explanation of symbols]

1 mobile phone, 31, 31a, 31b location registration reception signal, 50, 51, 52a, 52b, 53, 54a, 5
4b, 55a, 55b, 56, 57 system call code management table, 100 home office private mobile exchange,
200, 300, 400 Visitor office private mobile switch, 120, 220, 320, 420 service area.

Claims (8)

[Claims] 1. A home office private mobile exchange and a plurality of visitor office private mobile exchanges are interconnected by a communication line, and the home office private mobile exchange and the plurality of visitor private mobile exchanges are interconnected. In the location registration method for roaming of the mobile phone when the mobile phone moves between different service areas respectively assigned by the body exchange, the plurality of visitors capable of roaming the mobile phone during location registration in roaming of the mobile phone. A location registration method in roaming of a mobile telephone, wherein a system call code of a private mobile exchange is designated from the home office private mobile exchange. 2. A home office private mobile exchange and a plurality of visitor office private mobile exchanges are interconnected by a communication line, and the home office private mobile exchange and the plurality of visitor private mobile exchanges are interconnected. In the location registration method for roaming of the mobile phone when the mobile phone moves between different service areas respectively assigned by the body exchanges, the location registration in roaming of the mobile phone may be performed by roaming from the visitor office private mobile exchange. A location registration method for roaming a mobile phone, characterized by indicating a possible system call code. 3. The mobile station switching system of the visitor station transmits only the system call code of the mobile switching system of the home station or the mobile switching system of the visitor station having a service area adjacent to its own service area to the mobile phone. 3. The mobile phone according to claim 2, wherein the mobile phone calculates a difference between the system call codes received at the time of receiving the location registration, restores the complete system number based on a predetermined arithmetic expression, and stores the complete system number in a system call code management table. Location registration method for roaming mobile phones. 4. A home office private mobile exchange and a plurality of visitor office private mobile exchanges are interconnected by a communication line, and said home office private mobile exchange and said plurality of visitor office private mobiles are interconnected. In the location registration method for roaming of a mobile phone when the mobile phone moves between different service areas each of which is shared by an exchange, only one system call code is stored in advance in a system call code management table of the mobile phone, The plurality of visitor station private mobile exchanges each transmit the system call code stored in the system call code management table of the mobile phone to the mobile phone as a notification signal, and the mobile phone can roam by itself. Determines whether or not it is the service area of the mobile office of the visitor station and issues a location registration request A location registration method for roaming a mobile phone. 5. A column for storing a system code of a visitor station private mobile switchboard whose location has been registered in a system call code management table of a mobile phone, and a system of a visitor station private mobile switchboard for which a location cannot be registered. The system is stored in a column for storing a system code of the mobile station switching system of the visitor station that could not be registered in the system call code management table. 5. The location registration method according to claim 4, wherein the location registration operation is not performed any more in the service area when the call code is received. 6. The mobile phone according to claim 5, wherein when the system call code management table of the mobile phone is updated, the oldest stored system call code is deleted and a new system call code is stored. Location registration method for roaming. 7. A home office private mobile exchange and a plurality of visitor office private mobile exchanges are interconnected by a communication line, and the home office private mobile exchange and the plurality of visitor private mobile exchanges are interconnected. In the location registration method for roaming of the mobile phone when the mobile phone moves between different service areas respectively allocated by the body exchanges, the system call code management table of the mobile phone stores any system call code in an initial state. The plurality of visitor station private mobile exchanges still transmit a location registration reception signal to the mobile phone even if the mobile phone has identified an authentication mismatch from the authentication response signal received from the mobile phone. The visitor station private mobile exchange that has received the location registration acceptance signal is used as a roamable visitor station private mobile exchange. And storing the system call code in a system call code management table. 8. A mobile switching system for a plurality of visitor stations, comprising:
8. The location registration method according to claim 7, wherein the notification signal includes information indicating whether or not roaming is possible.