JPH07177553A - Mobile communication system - Google Patents

Abstract

PURPOSE:To reduce the operating communication line number to connect a caller exchange and a called exchange. CONSTITUTION:When a caller terminal equipment 110 sends a call request leading to a mobile terminal equipment 105 to a PBX 102 via a PBX 101, the PBX 102 continues connection processing when the called mobile terminal equipment 105 is resident in a station of the PBX 102 or sends a release end message informing a moving destination PBX 103 of the called terminal equipment 105 to the caller PBX 101 when the called mobile terminal equipment 105 is moving to the other PBX 103. The caller PBX 102 sends a call request newly to the moving destination PBX 103 informed through the message.

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 in which a mobile terminal communicates with another terminal through a switch, and more specifically, when a call is received by a mobile terminal moving in a switched network,
The present invention relates to a mobile communication system that performs optimal connection control according to the destination of a mobile terminal.

[0002]

2. Description of the Related Art A private network has a plurality of private branch exchanges (hereinafter referred to as PBXs).
In the mobile communication system in which the position information of the mobile terminal in the network is managed by the PBX to which each mobile terminal subscribes, each PBX is connected to another PBX in the private network.
When receiving a call origination request from a mobile terminal that subscribes to its own PBX, if the mobile terminal has moved to another PBX, relay connection processing is performed to the destination PBX.

In Japanese Patent Laid-Open No. Hei 5-22771, in connection control of a wireless telephone connected to an exchange in which stations are connected by a common line, a location information storage memory of the wireless telephone is centralized in a master station, A method is disclosed in which, when a call is made to a telephone, a slave station other than the master station inquires the master station of the position of the wireless telephone via a common line and performs a call process based on the returned position information.

[0004]

When a mobile terminal receives an incoming call, the above-mentioned exchange to which the mobile terminal subscribes performs relay connection processing with respect to the exchange to which the subscriber terminal moves. For example, even if there is a direct communication line between the originating exchange and the destination exchange, the call is sent between the originating exchange and the destination exchange, as well as the subscriber exchange. The inconvenience arises in that two communication lines between the destination exchange and the destination exchange are used.

An object of the present invention is to provide a call origination request to a moving terminal to another exchange in the network in a mobile communication system in which the position of each mobile terminal in the network is managed by a subscriber exchange of each mobile terminal. It is to provide a mobile communication system capable of effectively using a telephone line when there is (an incoming call).

[0006]

In order to achieve the above object, according to the present invention, when a call request addressed to a subscriber terminal of the own exchange is received from another exchange in the network, the mobile terminal moves to the other exchange. In this case, each switching device notifies the switching requesting switching device of the identification information of the switching device to which the mobile terminal moves.

According to the present invention, the exchange that has transmitted the call request to the subscriber exchange of the mobile terminal (source exchange) receives the identification information of the exchange that is the destination of the destination mobile terminal from the subscriber exchange. , Based on the identification information, a call origination request is made to the destination exchange of the destination terminal.

According to one embodiment of the present invention, each exchange has route information indicating an optimum connection route between all the exchanges in the network, and is transmitted from another exchange to a subscribing mobile terminal of its own exchange. When the request is received, if the mobile terminal is moving to another exchange, the optimum connection path information is referred to and the optimum connection between the exchange to which the terminal is moved and the originating exchange. A route is obtained, and it is determined whether the destination exchange should be relayed or the originating exchange should be notified of the destination exchange.

According to another embodiment of the present invention, the optimum connection route information between all the exchanges in the switching network is centrally managed in one place in the switching network, and each exchange can store the optimum connection route information. Inquires the management target device of the optimal connection route between the destination exchange and the source exchange of the mobile terminal, and based on the notified optimal connection route, the above-mentioned relay connection process or destination notification process to the originating exchange Make a selection of.

[0010]

According to the present invention, when a call request addressed to a subscriber terminal is received from another switch in the network, each switch performs an extension call reception process when the destination terminal is located in its own switch, If the destination terminal is moving to another exchange, it operates so as to notify the source exchange of the destination exchange.In the latter case, the source exchange will not be able to communicate with the destination exchange of the destination mobile terminal. It is possible to directly use the call line with the destination exchange of the terminal without using the call line between them, and to effectively use the call line.

[0011]

FIG. 1 is a diagram showing the overall configuration of a private mobile communication system to which the present invention is applied. 101 to 103 are private branch exchanges (PBX), and 104 to 106 are mobile terminals (PBX).
S), 107 to 109 are base stations (CS), 110 to 11
Reference numeral 2 indicates a wired terminal. A dedicated line 116 connects the PBXs to form a dedicated line network.

Each mobile terminal 104-106 and each base station 10
7 to 109 are connected by a wireless communication interface 113, and these base stations 107 to 109 and the PBX 101 are connected.
-10 to 103, and the wired terminals 110 to 112 and PB
The X 101 to X 103 are connected by telecommunication line interfaces 114 and 115. As the wireless communication interface 113 applied between each mobile terminal and each base station, for example, there is a second generation cordless telephone system standard by the Radio System Development Center.
The telecommunications line interface 115 between each base station and the PBX is, for example, an IS based on CCITT.
A DN interface standard or a conventional analog subscriber line interface can be applied.

FIG. 2 shows the exchange (PBX10 shown in FIG.
1 to 103) shows an example of a specific configuration. PBX10
Reference numerals 1 and 102 denote a switch (SW) 201, a radio interface circuit (RIF) 202, a subscriber interface circuit (LIF) 203, and an outgoing / incoming line trunk (OGT / I).
CT) 204, Talkie Trunk (TKT) 205, C
It comprises a PU 206, a memory (MEM) 207, and a common line signaling device (CSP) 209.

The RIF 202 has a base station (hereinafter referred to as CS
107, 108 are connected to each CS, and a mobile terminal (hereinafter, referred to as “CS”) is connected to each CS via a wireless communication interface 113.
These are referred to as PS) 104 and 105 are connected. LIF20
Telephones 110 and 111 are connected to 3, for example.
The OGT / ICT 204 is a trunk for communication that extends between exchanges via a public network or a leased line network, and the TKT 205 is a trunk for transmitting various voice guidance.

A CPU 206 is a processor for controlling the PBXs 101 and 102, and a MEM 207 is the above CPU.
It is a storage means for storing various programs and data executed by the above, and is composed of, for example, a semiconductor memory or a magnetic memory. In the MEM 207, the position management table 20 has information for managing the current positions of the PSs 104 and 105, which are necessary for mobile communication.
Stored as 8. CSP209 is one PBX1
The CPU 206 in 01 is the CPU 2 in another PBX 102.
6 shows a common line signal device for communicating control information and the like with 06.

FIG. 3 shows each ME in the PBX 101-103.
The structural example of the position management table 208 of PS stored in M207 is shown. The location management table 208 includes a mobile terminal number 301 and location information 302, and a PS that joins the own PBX and another PBX in the leased line network that has moved into the own PBX.
Manages the data of the PS that subscribes to. Mobile terminal number 30
1 is a number uniquely assigned within the leased line network,
The calling terminal corresponds to the dial number for calling the incoming PS. The position information 302 indicates the place where the PS 104 to 106 have last registered the position, and the PBX 101 to 103 indicates the PS 1
It is used when calling 04-106, and is P in the own station.
For S, use the identification numbers of CS107 to 109,
If you are in another PBX in the leased line network, PBX 101 to 1
The leased line number 03 is used. In the example of FIG. 3, for example, the PS having the mobile terminal number “86324” is assigned the identifier “11
It indicates that the location is registered in the CS having "1".

In FIG. 4, the telephone 110 of the PBX 101 has a P
The sequence in the case of originating operation to the PS 105 that joins the BX 102 is shown. In FIG. 4, the calling terminal 110 is P
When the call setup message including the mobile terminal number of S105 is transmitted, the PBX 101 which has received the message sets up the private line 11
A call setup message is transmitted to the PBX 102 to which the PS 105 is subscribed via 6. PB that received the call setup message
In step 401, the X 102 searches the location management table 208 in the MEM 207 for the location information 302 of the destination PS 105. In step 402, it is determined from the search data in step 401 whether the PS 105 is moving to another station, and if it is in its own station, PBX1
A call setup acceptance message is sent to 01 and a call setup message is sent to PS 105 via CS 108 having the number registered in location information 302 in location management table 208.

If the result of determination in step 402 is that the mobile station is moving to another station, the PBX 101 is switched to the PS as shown in FIG.
The release completion message including the information of the transfer destination PBX 103 of 105 is transmitted, and it is requested to retransmit to the received transfer destination PBX 103.

When the PBX 101 which has received the release completion message from the PBX 102 includes the destination PBX number of the PS 105 in the received release completion message,
In step 403, it is determined whether or not the destination PBX is the own station, and if it is the own station, extension connection processing is performed, and if it is another station, a call setting message is transmitted to the destination PBX 103 of PS 105. .

PBX 103 that received the call setup message
In step 401, the PS1 moving from the position management table 205 in the MEM 207 to the PBX 103.
The location information 302 of 05 is searched, the call setting acceptance message is transmitted to the PBX 101, and the CS having the number registered in the location information 302 in the location management table 208 is sent.
The call setup message is transmitted to the PS 105 via 109.

In FIG. 4, when the result of the determination in step 402 is that the PS 105 has moved to another station, according to the conventional method, the PBX 102 sends a call setup acceptance message to the PBX 101 and, in the location management table 205, The call setup message is transmitted to the PBX 103 having the leased line number of the destination PBX registered in the location information 302 of
The BX 103 sends a call setup message to the moving PS 105 via the CS 109. In this case, the incoming PS105
The connection message from CS105, PBX103, P
The communication line 116 that is transmitted to the PBX 101 via the BX 102 and is used when making a call is the PBX 101 and the PBX 101.
Two lines of the BX102 line and the PBX102 and PBX103 lines are used.

On the other hand, according to the method of the present embodiment, only one communication line, PBX 101 and PBX 103, needs to be used.

FIG. 5 shows the format of the ISDN interface release completion message 501 communicated between the PBXs. In FIG. 4, when the PS 105 is moving to the PBX 103 at the time of receiving the call request from the PBX 101 to the PS 105,
The PBX 102 sets a code indicating that the incoming PS is moving in the reason display area 502 in the release completion message 501 of FIG. 5, and also sets the destination PBX number and PS of the PS in the user / user information area 503. Set a number and send to the originating PBX 101.

Next, a second embodiment of the present invention will be described. In the above-described first embodiment, when the incoming PS is moving, the source PBX makes a call again to the destination PBX of the incoming PS. However, in the second embodiment, each source within the leased line network is shown. The optimum connection route information between each PBX in the leased line network provided in the MEM 207 of the PBX 101 to 103 is used.

FIG. 6 is a MEM of each PBX 101-103.
An example of a table configuration showing optimum connection route information between each PBX in the leased line network provided in 207 is shown. The matrix configuration is such that the originating station 602 is shown in the vertical direction and the receiving station 603 is shown in the horizontal direction, and the optimum connection route information 604 between the PBXs is shown in a frame where the PBX as the originating station and the PBX as the receiving station intersect. There is. As the optimum connection path information 604, for example, when there is a line directly connected between the PBXs, it indicates that it is a direct connection line, and when connecting via a relay station, it indicates the number of the PBX that is the relay station.

In the network configuration of FIG. 1, for example, in the case where PBX1 and PBX3 are not connected by the dedicated line 116 and PBX2 is always a relay station, PBX1 and PB3 are connected.
Information indicating that the PBX 2 is relayed is registered as the optimum connection path information 604 of X3.

FIG. 7 shows that the telephone 110 of the PBX 101 has a P
The sequence in the case of originating operation to the PS 105 that joins the BX 102 is shown. In FIG. 7, the calling terminal 110 is P
When the call setup message including the mobile terminal number in S105 is transmitted, the process is performed up to step 402 as in FIG. As a result of step 402, when the PS 105 is moving to another station, the PBX 102 determines in step 701 that it is a MEM.
The optimum connection path information table 601 in 207 is searched for the optimum connection path information 604 of the source PBX 101 and the destination PBX 103 of the PS 105. In step 702, it is searched from the search data of step 701 whether or not the own PBX 102 is a relay station when the optimum route is taken, and if it is not the relay station, it is shown in the first embodiment. The same method as in FIG. 4 is used.

As a result of the determination in step 701, when the relay station is the relay station, for example, in the network configuration of FIG. 1, the PBX 101 and the PBX 103 are not connected by the dedicated line 116 and the PBX 102 is always the relay station. , The PBX 102 is the same as the conventional system described above.
The call setup acceptance message is sent to X101 and the call setup message is sent to PBX103 having the leased line number of the destination PBX registered in location information 302 in location management table 205, and PBX103 is moving through CS109. Send a call setup message to the PS 105.

In this case, in the case of the method shown in the first embodiment, even if the PBX 101 sends the call setup message to the PBX 103 again, the call always goes through the PBX 102. Therefore, in the second embodiment, the first It is possible to perform more optimal connection processing than the embodiment.

The optimum connection route information table 601 is shown in FIG.
As shown in, the common management may be performed at one place in the leased line network. In FIG. 8, reference numeral 801 denotes a computer for managing the optimum connection route information table 601, which includes a communication control device 802, a CPU 803, a memory (ME).
M) 804. The communication control device 802 is a device for communicating control information and the like with the CSP 209 of each PBX 101 to 103 in the leased line network via a common line.

FIG. 9 shows a sequence when the telephone 110 of the PBX 101 makes a call operation to the PS 105 that joins the PBX 102 in the system in which the optimum connection route information table is commonly managed. In FIG. 9, when the calling terminal 110 sends a call setup message including the mobile terminal number of the PS 105, the processing is performed up to step 402 in the same manner as in FIG.
When the destination PS 105 is moving to another station as a result of step 402, the PBX 102 manages the optimum connection route information table 601 in the leased line network by the computer 80.
1 to the outgoing PBX 101 and the destination PBX 103 of the incoming PS
Inquires about the optimum connection route information of. Computer 80
1, the PB designated by the optimum connection route information table 601 in the MEM 804 in step 901.
The optimum connection route information 604 between the X and the PBX 102 is searched.
Notify to. In the PBX 102, step 702 is performed in the same manner as in FIG. 7 based on the optimum connection route information notified from the computer 801, and thereafter, the same as in FIG. 7.

In each of the above embodiments, the private network constituted by the PBX is applied, but the present invention can be applied to the public network.

[0033]

As is apparent from the above description, according to the present invention, when a mobile terminal receives a call, the number of communication lines used between the source exchange and the destination exchange is reduced, and resources are saved. It enables effective communication.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of the overall configuration of a mobile communication system to which the present invention is applied.

FIG. 2 is a diagram showing a configuration of a mobile communication switching system that constitutes a mobile communication system.

FIG. 3 is a diagram showing a configuration of a location management table included in a PBX.

FIG. 4 is a diagram showing an operation sequence in the case of making a call operation to a mobile terminal moving in a leased line network via a PBX.

FIG. 5 is a diagram showing a format of a release completion message exchanged between PBXs.

FIG. 6 is a diagram showing a configuration of an optimum connection route information table in a leased line network included in the PBX.

FIG. 7 is a diagram showing an operation sequence in the case of making a call operation to a mobile terminal moving in a leased line network via a PBX.

FIG. 8 is a diagram showing an example of a configuration of a mobile communication system to which the present invention is applied.

FIG. 9 is a diagram showing an operation sequence in the case of making a call operation to a mobile terminal moving in a leased line network via a PBX.

[Explanation of symbols]

101-103 ... PBX, 104-106 ... Mobile terminal,
107-109 ... Base station PBX, 116 ... Dedicated line, 20
1 ... Position management table, 601 ... Optimal connection route information table.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mikisuke Kuroyanagi 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Information & Communication Division

Claims (3)

[Claims] 1. The position information in the network of a mobile terminal moving in a switching network in which a plurality of mobile communication exchanges (hereinafter, referred to as exchanges) are connected by a trunk line is used to obtain the position information among the plurality of exchanges. In a mobile communication system managed by an exchange to which a terminal joins, each of the exchanges, when receiving a call request from another exchange in the exchange network to the mobile terminal that joins the own exchange, the mobile terminal sends the exchange to another exchange. If it is moving, the exchange that sent the call request is notified of the move destination switch of the mobile terminal, and as a response to the call request, the call destination switch receives a notification of the move destination switch of the mobile terminal. The mobile communication system, wherein the exchange makes a call request to the destination exchange of the mobile terminal notified from the destination exchange. 2. The position information in the network of a mobile terminal that moves in a switching network in which a plurality of mobile communication exchanges (hereinafter referred to as exchanges) are connected by a trunk line is used as a basis of the movement among the plurality of exchanges. In a mobile communication system managed by an exchange to which a terminal joins, each exchange has optimum connection route information between all exchanges in the exchange network, and each exchange joins its own exchange from another exchange in the exchange network. When the mobile terminal is moving to another exchange when receiving a call request to the mobile terminal, the destination exchange of the mobile terminal and the originating exchange are determined from the optimum connection route information of the own exchange. Between the mobile terminal and the destination exchange of the mobile terminal, or the local exchange performs relay connection processing to the destination exchange of the mobile terminal based on the information. The exchange that has received the notification of the destination exchange of the mobile terminal from the destination exchange makes a call to the destination exchange of the mobile terminal notified from the destination exchange as a response to the call request. A mobile communication system characterized by making a request. 3. The mobile communication system according to claim 2, wherein optimum connection route information between all exchanges in the exchange network is centrally managed at one place in the exchange network, and each exchange exchanges the exchanges. When receiving a call request from the other exchange in the network to the mobile terminal that joins the own exchange, if the mobile terminal is moving to another exchange, the mobile terminal is moved to the management destination of the optimum connection route information. By inquiring about optimal connection route information between the destination exchange of the terminal and the originating exchange, based on the notified optimal connection route information,
Whether the own exchange performs relay connection processing to the destination exchange of the mobile terminal or determines whether to notify the destination exchange of the mobile terminal to the exchange that has transmitted the call request, as a response to the call request, The mobile communication system, wherein the exchange that has received the notification of the destination exchange of the mobile terminal from the destination exchange makes a call request to the destination exchange of the mobile terminal notified from the destination exchange.