JP3016457B2 - Communications system - Google Patents

Abstract

PURPOSE:To shorten a period during which the mobile machine of a free state is made incapable of terminating a call. CONSTITUTION:A control right to change the call state of the mobile machine stored in a home memory 7 is given to only subscriber's switchboard 4. When a call request to the mobile machine 3 is issued from a fixed terminal 11, a switchboard 21 sets the terminal 11 to a line for a gateway switch board 5, and the gateway switchboard 5 inspects the call state of the mobile machine 3 in the home memory 7. If it is 'unused', it executes line setting for a repeating switchboard 63, and the switch 63 executes further the line setting for the subscriber's switchboard 4, and the subscriber's switchboard 4 changes the call state for the mobile machine 3 in the home memory 7 to 'busy', and in addition, it sets the line for the mobile machine 3, and connects the mobile machine 3 to the terminal 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mobile communication network, such as a mobile communication network and a fixed communication network, in which mobile subscribers mutually exchange via a local exchange and, if necessary, further via a transit exchange. Enables communication and communication with a fixed communication network subscriber via a gateway exchange, stores terminal information including a call status of a mobile subscriber in a home memory, and transfers from a fixed communication network subscriber to a mobile subscriber. When there is an incoming request, the terminal information for the mobile subscriber is referenced from the home memory. If the mobile subscriber is not in use, the incoming connection control for the mobile subscriber is performed. To a communication system in which is updated to a use state.

[0002]

2. Description of the Related Art An incoming connection from a fixed communication network in a conventional mobile communication network will be described with reference to FIG. This mobile communication network is described in, for example, Preliminary Lectures SA-1-2, "Structure and Application Technology of Large-Scale Mobile Communication Network" of the Institute of Electronics, Information and Communication Engineers, 1991. And transmitting from the fixed terminal 1 ₁ housed in the exchange 2 ₁ fixed communication networks, when performing a call by call to the mobile station 3 of the mobile communication network, at the request of a call from the fixed terminal 1 _1, exchange 2 to connect the line control circuit 10 ₂ and the fixed terminals in gateway exchange 5 of the mobile communication network using the communication line 9 _1. In the gateway exchange 5, when the communication line 9 ₁ is connected to the line control circuit 10 ₂ and recognizes the call request to the mobile device 3, the call in the terminal information of the mobile device 3 of the state storage circuit 8 in the home memory 7 is recognized. If the status is checked and the status is "unused", a call to the mobile device 3 is possible, so that the state control right for the call status of the mobile device 3 stored in the status storage circuit 8 is generated. Control circuit 11
_The state storage circuit 8 is changed from “unused” to “in use” by 2
Is transmitted to the home memory 7.
Next, the communication line 9 ₁ connects the communication line 9 ₂ to line control circuit 10 ₂ to connect the line control circuit ₁₀₃ in the relay switch 6 _3. Transit switch 6 ₃ In the line control circuit 10 ₃
Call When the line 9 ₂ is connected to, and connects the communication line 9 ₂ and 9 ₃ via the line control circuit 10 _3. It is connected to the local exchange 4 by connecting the communication line 9 ₃ to the line control circuit 10 _3. In the local exchange 4 recognizes when the radio speech circuit 14 is telephone line 9 ₃ are connected, the state control right is shifted to the subscriber exchange 4. Call line 9
_The mobile station 3 is connected to the mobile station 3 by connecting the wireless line 12 to the mobile station 3 via the radio communication circuit 14, so that a call between the fixed terminal ₁₁ and the mobile station 3 becomes possible.

[0003] When the call ends, from the side that requested the disconnected call, sequentially, communication line 91 _to 93 _3, line control circuit 10
_{The connections of 2} and 10 ₃ , the radio communication circuit 14 and the radio line 12 are released. Here, when the connection between the wireless communication circuit 14 and the mobile device 3 via the wireless line 12 is released,
State control circuit 1 in local exchange 4 having state control right
The 1 _4, transmits a status control signal for changing the communication state stored in the state storage circuit 8 from "in use" in the initial state to the "unused" to the home memory 7. At this point, the state control right held by the local exchange 4 disappears. From this time, a call request to the mobile device 3 can be accepted.

[0004]

[SUMMARY OF THE INVENTION In the conventional communication system described above, problems described below with reference to FIG become impossible connection with transit exchange 6 ₃ occurs. That issues a call request from the fixed terminal 1 ₁ to the mobile station 3, the exchange 2
When _one performs a line setting that connects the fixed terminal 1 ₁ to gateway exchange 5, gateway exchange 5 requests the call state information of the mobile device 3 to the home memory 7, receives the information in the unused state is that the mobile station Then, a state control right is generated in the gateway exchange 5, and
Control is performed to update the call state information of the mobile device 3 in the home memory 7 during use, and the fixed terminal ₁₁ is switched to the transit exchange 6 _3.
Set the line to connect to. Transit exchange 6 ₃ even attempt is made to line setting for connecting to the local exchange 4 the fixed terminal 1 _1, the subscriber exchange 4, communication line failure, or have the line is full, the mobile station 3 is called If it becomes impossible the line set by such or have refused to, and transit exchange 6 ₃ detects a connection is impossible, because usually issues a busy tone, a fixed terminal 1 heard the busy tone ₁ returns the subscriber handset, the disconnection request is generated, and releases the connection with the fixed terminal 1 ₁ switch 2 and the telephone line 9 _1, thereby at gateway exchange 5 communication line 9 ₁ and 9 ₂ Is released, and at the same time, a state control signal for updating the call state of the mobile device 3 to "unused" is transmitted to the home memory 7, and the corresponding call state in the home memory 7 becomes "unused". Therefore, the call state for the mobile device 3 is changed from “unused” to “in use”.
During the return to “unused”, another incoming call request to the mobile device 3 is not accepted even though the mobile device 3 is actually idle. For example the fixed terminal 1 ₂ the mobile device 3, second switching system _2, gateway exchange 5, the relay switch 6 _5, originally via the subscriber exchange 4 is also possible incoming back from said "in use" to "unused" Unable to receive a call until it is received.

Furthermore detect the possible connection transit exchange 6 _3, busy tone from the guidance generator 13 not remove the to the fixed terminal 1 _1, already line control circuit 10 ₂ communication lines are connected by 9 ₁ through 9 _2, when sending the guidance of reason can not be connected, by subscriber of the fixed terminal 1 ₁ is heard guiding the connection impossible, issues a disconnect request to return the handset, a line control circuit 10 ₂ calls The time until the connection with the line 9 ₁ or 9 ₂ is released is further delayed, and the time until the gateway exchange 5 transmits the state control signal for updating the communication state of the mobile unit 3 to “unused” becomes longer. However, there is a problem that the period during which another incoming call request to the mobile device 3 cannot be accepted is further lengthened.

[0006]

According to the present invention, the information for updating the communication state of the terminal stored in the home memory is stored in the home memory only in the called local exchange that controls the called terminal. Means for notifying the memory is provided.

[0007]

In the structure of the present invention, when the connection request to the destination terminal arrives at the gateway exchange, the gateway exchange knows the communication state of the corresponding destination terminal from the home memory, and if this is "unused", sets the line for the relay exchange. However, the home memory is not controlled to change the communication state to “in use”. The transit exchange sets the line for the subscriber exchange when the connection with the gateway exchange is made. When the connection with the transit exchange is made, the subscriber exchange has a state control right, and the communication state of the corresponding called terminal in the home memory. Is controlled to “in use” and the line setting for the receiving terminal is performed to enable communication between the receiving terminal and the calling terminal. In the connection operation described above, even if the line to the subscriber exchange cannot be set by the transit exchange, the incoming call from the other originating terminal can be received because the communication state of the receiving terminal is not "in use".

[0008]

FIG. 1 shows an embodiment of the present invention, in which parts corresponding to those in FIG. 5 are denoted by the same reference numerals. In the present invention,
The state control circuit of the gateway exchange 5 is omitted, and only the subscriber exchange ₄ is provided with the state control circuit 114. 2 to FIG.
Are shown, and parts corresponding to those in FIG. 1 are denoted by the same reference numerals.

Each line control circuit 10 in the exchanges 2 ₁ and 2 _2
1, 10 ₅ and between each of the line control circuit 10 _2, each between the circuit control circuit 10 ₂ and 10 ₃ and 10 _5, line control circuit 1
0 ₃ and 10 ₅ respectively communication line 9 ₁ between each of the radio communication circuit 14, 9 _6, 9 _2, 9 _4, 9 _3, 9 in addition to the control line 15 ₁ of _5, 15 _6, 15 _2, 15 ₄ , 15 ₃ , 15
_{5 is} also connected. Gateway exchange 5, transit exchange 6 ₃ ,
6 ₅ , an analysis circuit 16 ₂ ,
16 ₃ , 16 ₅ , and 16 ₄ are provided, and mobile device information (location information, call state information,
Based on the service information that can be received, etc.) and the line setting information transmitted and received between the line control circuits, it is analyzed whether a call request to or from the mobile device 3 can be accepted. A state control circuit 11 ₄ and the analyzing circuit 16 ₄ for analyzing circuit 16 ₂ and the subscriber exchange 4 of gateway exchange 5, the transmission and reception of the mobile station information and status control signals between the state storage circuit 8 of the home memory 7, Gateway exchange 5, Subscriber exchange 4
Communication control circuits 17 ₂ and 17 ₄ respectively provided in
Home a communication control circuit 17 ₆ provided in the memory 7 is performed via connected between these communication lines 18 _2, 18 _4, respectively. Gateway exchange 5, relay exchange 6 ₃ , 6
_{5. The} controllers 19 ₂ ,
19 _3, 19 _5, 19 ₄ are provided, the controller 19
_2, 19 _3, 19 _5, respectively 19 ₄ line control circuit 1
0 ₂ , 10 ₃ , 10 ₅ , line connection / release control for the radio communication circuit 14, analysis circuits 16 ₂ , 16 ₃ , 16 ₅ , 1
6 ₄ control states analysis of the state control circuit 11 _2, 1
Generating state control signals for one ₄ and the communication control circuit 17 _2, 17 _4, transmission request of the mobile station information, the control for each circuit such as the reception control carried out.

Next, referring to FIG. 2 and FIG.₁Or
The operation of the system when the call is transmitted from the
explain. Exchange 2₁Is the fixed terminal 1₁Call request from
(Transmission request), the line control circuit 10₁By
Fixed terminal 1₁Call line 9₁Connect to and exchange barriers
Line control circuit 10 in machine 5_TwoControl line to request line setting
Fifteen₁To send through. This line setting request was received
Line control circuit 10_TwoSends a call request to the controller 19. _Two
Notify. Controller 19_TwoIs a call to mobile device 3
Analysis circuit 16 to determine whether or not_TwoControl to make
I do. The analysis circuit 16 activated by this_TwoIs communication control
Circuit 17_TwoFrom the communication line 18_Two, And a communication control circuit 1
7₆Via the mobile station stored in the state storage circuit 8
Requesting and receiving information on the mobile device including the call status of the third item;
And analyze the result._TwoNotify to
Controller 19_TwoIndicates that the result of the analysis is
If you call 9₁Circuit control circuit 10 to release_Two
Control. Line control circuit 10_TwoIs the control line 15₁Through
The line control line 10₁Send a line release request to
If the analysis result indicates that a call is possible, the controller 19_Two
Is call line 9₁And 9_TwoLine control circuit 1 to connect
0_TwoControl. Line control circuit 10_TwoSends a line setting request
Control line 15_TwoThrough the transit exchange 6_ThreeLine control within
Circuit 10_ThreeSend to

[0011] Access control circuit ₁₀₃ notifies the line setting request to the controller 19 _3. Controller 19 ₃
The analysis circuit 16 ₃ or can call to the mobile device 3, thereby determining the line setting information received with channel setting request.
Determination result from the analysis circuit 16 ₃ is a call if, as the controller 19 ₃ connects the communication line 9 ₂ and 9 _3, controls the line control circuit 10 _3. Line control circuit 10
₃ transmits the channel setting request via a control line 15 ₃ to the wireless communication line 14.

In the local exchange 4, a state control right for the mobile station 3 is generated when the radio communication circuit 14 receives the line setting request. Radio communication circuit 14 notifies the channel setting request to the controller 19 _4. Controller 19 ₄
Activates the state control circuit 11 ₄ to change the call state of the mobile device 3 from "unused" to "in use". Thus the state control circuit 11 ₄ is the communication control circuit 17 _4, the communication line 18 _4, changes the call status of the mobile device 3 via the communication control circuit 17 ₆ are stored in the state storage circuit 8. Here, the mobile device 3 cannot receive a call from another fixed terminal or a mobile device. The controller 19 ₄ is the communication line 9
_The wireless communication circuit 14 is controlled to connect the wireless communication circuit 12 to the wireless communication line 12. Once the connection has been made, communication line is established from the fixed terminal 1 ₁ to the mobile device 3, the fixed terminal 1 ₁ and the mobile device 3
Calls can be made with the.

[0013] fixed terminals 1 ₁ makes a disconnection request, the exchange 2 fixed terminals within ₁ 1 ₁ and the telephone line 9 _1, gateway exchange 5
Communication line 9 ₁ and 9 ₂ at the inner, to sequentially release each connection communication line 9 ₂ and 9 ₃ in the transit switch 6 _3, respectively line control circuit 10 ₁ is controlled ,, controller 19
₂ line control circuit 10 _2, the controller 19 ₃ controls each line control circuit 10 _3. Line control circuit 10
_3, receives the line release request radio communication circuit 14, the controller 19 ₄ is the state control circuit 11 ₄ activated to the communication control circuit 17 _4, the communication line 18 _4, through the communication control circuit 17 _6, state storage circuit 8 Is changed from "in use" to "unused". Here, the state control right of the local exchange 4 is extinguished, and the mobile station 3 can receive a call from another fixed terminal or a mobile station. Further, the controller 19 ₄ controls the line control circuit 10 ₄ so as to release the connection between the communication line 9 ₃ , the wireless communication circuit 14, and the wireless line 12.

[0014] In the incoming connection operation from the fixed terminal 1 ₁ described above to the mobile station 3, the operation when incapable of line setting to the subscriber exchange 4 in transit exchange 6 ₃ with reference to FIG. Line control circuit 10 ₃ in the relay switch 6 ₃ until activates the controller 19 ₃ receives the channel setting request is the same as described above. Controller 19 ₃ to the analysis circuit 16 ₃ whether or not it is possible to call to the mobile device 3, thereby determining the line setting information. If the determination result from the analysis circuit 16 ₃ is impossible call, the controller 19 ₃ is guided generating circuit 13 ₃
And sends the derived guide connectable controls the line control circuit ₁₀₃ to the fixed terminal 1 _1.

[0015] In this manner, in the present invention since not changed control the communication state of the mobile device 3 to "in use" in gateway exchange 5, with the conventional relay switch 6 ₃ can not be set the line to the subscriber exchange 4 Means that the gateway exchange 5 is the mobile 3
After changing the call state of the call to "in use",
₃ gives a guidance that connection is not possible, and fixed terminal 1 that heard this
_One subscriber returns the handset and the disconnection request is sent to the gateway switch 5.
Until the gateway exchange 5 returns the call state of the mobile unit 3 to "unused", the mobile unit 3 is in an idle state, but an incoming call request from another subscriber to the mobile unit 3 is blocked. But
In the present invention, such a situation does not occur, and an incoming call request to the mobile device 3 can be efficiently processed.

In the above description, the present invention has been described as an example of an incoming connection from a fixed terminal of a fixed communication network to a mobile unit of a mobile communication network. However, the present invention is not limited to the fixed communication network but to an international communication network or another mobile communication network. The present invention can also be applied to the case of an incoming connection from a terminal to a mobile device. In addition to mobile communication networks,
Also in a personal communication system, when a subscriber registers a receiving terminal and stores it in a home memory,
The present invention can be similarly applied to the incoming connection to the subscriber of the personal communication. The present invention is also applicable to the case where the transit exchange is omitted in the above description.

The present invention can be applied not only to a connection for a telephone call but also to a connection for facsimile, data communication, and the like.

[0018]

As described above, according to the present invention, since only the local exchange has the control right for controlling the communication state of the home memory, the incoming request from the calling terminal to the called terminal is stopped. If the connection is not possible or the connection becomes impossible, the communication state of the called terminal in the home memory is not changed to "in use", and the incoming call request from the calling terminal to the called terminal can be accepted. If communication is possible, the status of the receiving terminal is updated from "in use" to "unused" at the latest time, so that the "unused" status in which the receiving terminal cannot accept communication requests Can be shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram in which each part of the embodiment of FIG.

FIG. 3 is a diagram showing an operation sequence of an incoming connection from the fixed terminal ₁₁ to the mobile device 3 in the embodiment of FIG.

[4] FIG incoming request of the mobile device 3 from the fixed terminal 1 ₁ in the embodiment of FIG. 2 to illustrate an operation sequence when it becomes impossible connection with transit exchange 6 _3.

FIG. 5 is a block diagram showing a mobile communication network connected to a conventional fixed communication network.

6 shows a conventional operation sequence when the relative incoming request from the fixed terminal 1 ₁ to the mobile station 3 transit exchange 6 ₃ becomes impossible connection.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinobu Kanashige 2-10-1 Toranomon, Minato-ku, Tokyo Inside NTT Mobile Communication Network Co., Ltd. (56) References JP-A-3-219499 ( JP, A) JP-A-4-132425 (JP, A) JP-A-6-86355 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q 7/06-7/38

Claims (1)

(57) [Claims] 1. A subscriber exchange for controlling communication with a receiving terminal, a gateway exchange for controlling communication with another communication system, and between said subscriber exchanges, or between said gateway exchange and said subscriber exchange. A home exchange for storing and managing terminal information including a communication state of the called terminal, wherein the subscriber exchange on the called side controls the called terminal. Only a means for notifying the home memory of information for updating the communication state of the terminal stored in the home memory.