JP2507956B2 - Connection method of incoming call in mobile communication system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly, to a connection system for incoming calls in a mobile communication network having a plurality of mobile communication exchanges which are connected to each other by a common signal line separate from a communication line.

[0002]

2. Description of the Related Art With the widespread use of mobile bodies such as automobiles, mobile terminals and mobile phones mounted on these mobile bodies (hereinafter, referred to as
2. Description of the Related Art Mobile communication systems have become widespread that enable telephone calls between a mobile terminal (generally referred to as a mobile terminal) and a subscriber of a public telephone network or another mobile terminal.

A method of connecting an incoming call to a mobile terminal in a mobile communication system of this type is disclosed in Japanese Patent Laid-Open No. 1-228331.
As the Japanese Patent Publication discloses as an example of the inside of the automobile telephone network, it is configured so as to avoid the invalid hold of the communication line as much as possible.

FIG. 8 is a block diagram of the automobile telephone network described in the above publication, and FIG. 9 is a diagram showing an example of a process of connecting an incoming call to a mobile terminal in the automobile telephone network.

As shown in FIG. 8, in the conventional automobile telephone network, the central control unit (CC) 112 of the gateway office automobile telephone exchange 110, which receives an incoming call from the general telephone network to the mobile unit, is a mobile unit. Call command transmission unit (C that issues a call command to the area containing the current position of
S0) 1121 and a response notification reception unit (CRR) 1122 that receives a response notification from the mobile device. In addition, the central control unit (CC) 132 of the in-station mobile phone exchange 130 corresponding to the in-area is the gateway mobile phone exchange 110.
Paging command receiving unit (CR0) 1321 for receiving a paging command from the mobile station 150 to the base station (MB
S) 140 and a response notification transmission unit (CSR) 1322 that transmits the response notification received. These CC11
2 and 132 are common line signaling devices (CSE) 113, 1
33, and a common line signaling network (CSN) 200. To the CSN 200, a home memory station car telephone exchange 120 that holds various information about the mobile device 150 in a file memory (FM) 124 is connected.

Subscribers 31 accommodated in the general telephone network 300
When 0 makes a call to the mobile device 150, the gateway station car telephone exchange 110 causes the home memory station car telephone exchange 120 to notify the incoming data DR (subscriber number SBN, subscriber data D, position) as shown in FIG. Even after receiving the information L and the mobile phone number REN), the in-station mobile telephone exchange 1
Calling the general calling command CO (SBN, REN, L) to the CS 30 without setting the connection of the communication line 161
Transmitted via N200, and located in station mobile telephone exchange 1
Only when the response notification AR (SBN, OK) is received from 30, the call line 161 is connected and set. With this configuration,
It is possible to avoid invalid hold of the call line 161.

[0007]

However, in the above-mentioned conventional method, a page message and a page response for identifying the current position of the called mobile terminal, that is, for confirming the unit service area (cell) where the called mobile terminal is located. The message is
After being returned from the home memory station car telephone exchange to the gateway station car telephone switch, this gateway station car telephone switch is transmitting to the corresponding in-location station car telephone switch,
The load of data processing in each of these exchanges is increased. Therefore, the time from the arrival of the call to the calling of the called mobile terminal corresponding to the call becomes long, and the effective utilization of the mobile communication network is hindered.

Therefore, an object of the present invention is to reduce the number of exchanges through which page messages and page response messages pass, thereby reducing the load of data processing in each of those exchanges, and thereby the called mobile terminal. It is an object of the present invention to provide a mobile-terminating call connection method in which the time until the call is shortened and the utilization efficiency of the mobile communication network is improved.

[0009]

According to the invention, a gateway mobile telecommunication switch for receiving a call from a subscriber to a mobile terminal,
A mobile communication switch that is connected to the barrier mobile communication switch by a call line and is provided corresponding to a service area including the current position of the mobile terminal, and this mobile communication switch and the mobile terminal and the call line, Radio base stations that are respectively connected through radio lines to transmit and receive signals to and from the mobile terminal, a home location registration register that holds various information about the mobile terminal, the barrier mobile communication exchange, the mobile communication exchange in the area, In the connection method of an incoming call in a mobile communication system including a common line signaling network that interconnects the radio base station and the home location registration register to mutually transmit various signals and messages by a common signaling system, the gateway is provided. The mobile switching center is at the home position
Means for supplying an incoming call information reading request to the registration register,
Identification of the current position of the mobile terminal in response to the read request
A paging message for the wireless base station
And the wireless base station is configured to
Page for the mobile terminal in response to a paging message
Send a message and respond to the page from the mobile terminal.
In response to the answer, the call response message is sent to the gateway mobile communication.
Having means for returning to the exchange, and said barrier mobile communication
The exchange responds to the call response message with an address
The IAM message, which is a signal, is transmitted to the mobile communication switching device
A connection system for an incoming call in a mobile communication system is provided, which further comprises means for supplying to the mobile communication system.

[0010]

Next, the present invention will be described with reference to the drawings.

Referring to FIG. 1 showing an embodiment of the present invention, the mobile communication network of the present invention is a gateway for receiving a call from a calling subscriber 1 accommodated in a public network switchboard 2 to a mobile terminal 7. A mobile communication exchange 3, a mobile communication exchange 4 which is connected to the barrier mobile communication exchange 3 by a call line 101 and corresponds to the area in which the mobile terminal 7 is located, and a mobile communication exchange 4 which is connected via the call line 102. The radio base station 5 connected to the mobile terminal 7 via the radio line 103, the home position registration register 6 holding various information about the mobile terminal 7, the exchanges 3 and 4, the base station 5 and the register 6 are connected to each other. And a common line signaling network 200.

The gateway mobile communication switch 3 includes a call path switch 10, a central control unit 11, a call connection common line control unit 12 for transmitting and receiving a line connection message to and from an opposing switch, a base station and an exchange. And a common line control device 13 for mobility management that transmits and receives a mobility management message to and from. Similarly, the mobile communication switching center 4 and the radio base station 5 are also provided with the communication path switches 20 and 30, the central control devices 21 and 31, the common line control devices 22 and 32 for call connection, and the common line control device for mobility management. 23 and 3
3 are provided respectively. The home location registration register 6 is a database 40 that holds call service registration information and location registration information of mobile terminals, and a common line control for wireless base stations that transmits and receives location information data of mobile terminals to and from base stations and exchanges. It has a device 41 and an exchange common line control device 42 for transmitting and receiving called mobile terminal data between the gateway mobile communication exchange 3.

FIG. 2 shows the central control units 11 and 2 in FIG.
1 is a block diagram of details of each of the common line control devices 1 and 31, the call connection common line control devices 12, 22 and 32, and the mobility management common line control devices 13, 23 and 33.

Referring to FIG. 2, the central controller 11 is
The call connection control unit 11a that sets and releases the communication path to the mobile terminal 7 and the line number for the mobile terminal 7 in response to the position information and the registered service information of the mobile terminal 7 is connected to the call connection control unit 11a. The mobile management control part 11b which transmits / receives between is provided. The call connection common line control device 12 includes a physical level control circuit 12a forming a physical interface with the common line signaling network 200, and a link level control for setting or releasing a data link for carrying a higher layer signal. The circuit 12b and the upper layer signal are connected to the common line signaling network 200.
And a network level control device 12c for performing routing control via the. Common line control device 1 for mobility management
3 is a physical level control device 13a corresponding to each of the circuits 12a to 12c described above, and a link level control device 13
b and the network level control device 13c, the SCCP (Signaling cone)
A section control part (signaling connection control part) 13d is provided. This level control device 13d controls the connection between the common line signaling network 200 and the control devices 12, 13, 22, 23, 32, 33, 41 and 42 connected to this network 200.

FIG. 3 is a block diagram showing the details of the wireless base station common line control device 41 and the exchange common line control device 42 in the home position registration register 6 of FIG. Referring to FIG. 3, the common line control device 41 for wireless base stations is
Physical level control circuit 41a and link level control circuit 4
1b, network level controller 41c, SCC
And a P level control device 41d. Similarly, the exchange common line control device 42 also includes a physical level control circuit 42a, a link level control circuit 42b, and a network level control device 42c. These components are common to the exchange 3 described with reference to FIG. 2 and will not be described in detail.

Next, referring to FIG. 4 showing the connection process of the incoming call to the mobile unit in the above embodiment and FIG. 5 showing an example of the message format on the common signaling network 200, the embodiment will be described. Describe the operation.

The calling subscriber 1 accommodated in the exchange 2 in the public network lifts the handset to make a call to the mobile terminal 7, and the identification number (eg, "030") for the mobile communication network and the mobile terminal 7 are used. Dial the phone number and. The exchange 2 in the public network receives the identification number and the subscriber telephone number and transmits them to the nearest gateway mobile communication exchange 3 via the telephone line 100.

In the gateway mobile telecommunication switch 3, the call connection control unit 11a of the central control unit 11 analyzes the identification number and the telephone number, and obtains the call reception information necessary for the call reception to the mobile terminal 7 in common. An incoming call information read request is transmitted to the home position registration register 6 through the network level control device 12c of the line signaling device 12, the link level control circuit 12b, the physical level control circuit 12a and the common signaling network 200. This incoming call information read request is issued by the physical level control circuit 42 of the exchange common line control device 42 of the register 6.
a, is supplied to the database 40 via the link level control circuit 42b and the network level control device 42c, and in response to this request, various information regarding the mobile terminal 7 is extracted from the database 40. The radio base station common line control device 41 of the register 6 checks the output of the register 6 for checking the position of the called mobile terminal 7 by the SCCP level control device 41d, the network level control device 41c, the link level control circuit 41b, It is transmitted to the radio base station 5 through the physical level control circuit 41a and the common line signaling network 200. The paging message (Fig. 5) is TTC (Tel
communication Technology
Commitee: standard MTP header and SCCP header defined by the Telegraph and Telephone Technical Committee), and includes a message identifier indicating a general call, a called mobile terminal number indicating the number of the mobile terminal 7, and the current location of the mobile terminal 7. Contains the number of the target calling area. The bit numbers of the codes forming each of the above areas of the message format according to the same standard are as written below each format. The radio base station 5 receives this paging message from the exchange 4, transmits it by a radio frequency carrier, and waits for a page response message from the called mobile terminal 7.

When the page response message cannot be received, the radio base station 5 returns a no response message (FIG. 5) to the home position registration register 6 through the common signaling network 200. This non-response message indicates that the mobile terminal 7 is powered off when the page message is transmitted from the base station 5.
It means that the mobile terminal 7 has already moved out of the paging area. Home position registration register 6
This information is used as an incoming call information read response (absence), and the common line signaling network 200, the physical level control circuit 13a of the mobility management common line control device 13, the link level control circuit 13b, the network level control device 13c, and the SCCP level control device. 13d and the movement management controller 1 of the central controller 11
1b and the calling subscriber 1 through the exchange 2 in the public network
To notify. The unanswered call message includes not only the MTP header and the SCCP header but also a message identifier indicating the unanswered call, an incoming mobile terminal number, and a calling area number.

When the page response is received, the radio base station 5
Returns a call response message (FIG. 5) to the home location registration register 6. The call response message is M
In addition to including the TP header and SCCP header, it also includes a message identifier indicating a call response, an incoming mobile terminal number, a call area number, and a response cell number corresponding to the cell that received the page response message. Next, the home position registration register 6 transmits an authentication request to the wireless base station 5 to confirm whether the mobile terminal 7 is registered in the regular communication network, and the authentication request is relayed by the wireless base station 5. Then, the authentication response is received by the mobile terminal 7 and returned to the wireless base station 5. Further, the register 6 receives the authentication response through the common line signaling network 200, refers to the database 40, and confirms that the expected value output from the algorithm previously stored in the database 40 matches the authentication response. Check the existence and check the result.
00 to the gateway mobile telecommunication exchange 3 as an incoming call information read response message. If the expected value does not match the recognition response, an authentication error flag is set in this response message to indicate that it is not normal, and the exchange 3
Notify the calling subscriber 1 via 2 and 2. If they match, a flag indicating that the authentication is normal is set in this response message, and the gateway mobile communication exchange 3 is set through the common line signaling network 200.
To notify. As a result, the gateway mobile communication exchange 3 transmits an IAM message as an address signal to the in-area mobile communication exchange 4, and conversely, the exchange 4 returns an ACM message indicating address completion to the exchange 3 and also the radio base station 5 Set up the call to. Next, the wireless base station 5 sets up a call to the mobile terminal 7 and calls the mobile terminal 7.

In the present embodiment, whether or not the mobile terminal 7 is properly registered in the communication network is confirmed by authentication, but this authentication may be omitted.

As described above, in this embodiment, the paging message used in the procedure for specifying the current position of the called mobile terminal requested from the gateway mobile communication exchange 3 is
The home location registration register 6 transmits to the mobile terminal 7 via the radio base station 5 without passing through the in-area mobile communication switch 4, and a response to the paging is returned from the radio base station 5 to the register 6. Treat these messages as transparent.

FIG. 6 is a diagram showing a process of connecting an incoming call to a mobile in the second embodiment of the present invention. In the present embodiment, the home location registration register 6 returns a read response to the exchange 3 in response to the incoming call information read request from the gateway mobile communication exchange 3, and the exchange 3 sends the register 6 and the in-area mobile communication exchange 4 to each other. It issues a general call instruction to the wireless base station 5 without passing through. In response to this, the radio base station 5 performs paging to the mobile terminal 7, and returns the result of confirmation of the response to the paging to the exchange 3 by the route opposite to the above. Authentication is also performed by the exchange 3. The other points are the same as those of the first embodiment described above, and thus the description thereof is omitted. However, in this case, the call connection control unit 11a of the central controller 11
Receives an authentication key for authenticating whether or not the mobile terminal 7 is properly registered in the communication network from the register 6 as an incoming call information read response message and temporarily holds it.

FIG. 7 is a diagram showing a process of connecting an incoming call to a mobile unit according to the third embodiment of the present invention. In this embodiment, in response to the incoming call information read request from the gateway mobile telecommunication switch 3, the register 6 sends a paging instruction to the wireless base station 5 via the in-area mobile telecommunication switch 4 without returning a response to the switch 3. To do. The authentication is performed by the register 6. The other points are the same as those of the first embodiment described above, and thus the description thereof is omitted.

In the above-mentioned first and second embodiments, it is possible to shorten the time until the subscriber hears the ringing tone after the completion of dialing, on average by about 2 seconds, as compared with the conventional method.
Further, in the third embodiment, it is possible to shorten the time by about 1 second. Therefore, the time required for the subscriber to start a call is shortened and the service is improved. Further, the invalid hold time of the telephone network is remarkably shortened, and the utilization efficiency of equipment in the network is improved.

[0026]

As described above, in the mobile communication system according to the present invention, the transfer route of the paging message and the response message to the paging message for specifying the current position of the called mobile terminal is simplified, and further, Since the messages are made transparent and the number of exchanges handling these messages is reduced, the data processing load of the exchanges can be reduced, and therefore the time from the dialing by the calling subscriber to the setting of the communication path can be shortened. As a result, the utilization efficiency of the mobile communication network can be improved.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing details of some of the components of FIG.

3 is a block diagram showing details of another part of the components of FIG. 1. FIG.

FIG. 4 is a diagram showing a process of connecting an incoming call to a mobile unit according to the first embodiment of the present invention.

FIG. 5 is a diagram showing an example of a message format in this embodiment.

FIG. 6 is a diagram showing a process of connecting an incoming call to a mobile unit according to the second embodiment of the present invention.

FIG. 7 is a diagram showing a process of connecting an incoming call to a mobile unit according to the third embodiment of the present invention.

FIG. 8 is a block diagram showing an example of a conventional automobile telephone network.

FIG. 9 is a diagram showing a connection process of an incoming call in this conventional example.

[Explanation of symbols]

 1 Calling subscriber 2 Public network switch 3 Gateway mobile communication switch 4 In-zone mobile communication switch 5 Radio base station 6 Home location registration register 7 Mobile terminal 10, 20, 30 Call path switch 11, 21, 31 Central control unit 12 , 22, 32 Call connection common line control device 13, 23, 33 Mobility management common line control device 40 Database 41 Radio base station common line control device 42 Switch common line control device 200 Common line signaling network

Claims (1)

(57) [Claims] 1. A gateway for receiving a call from a subscriber to a mobile terminal.
Mobile telecommunication switch and this gateway mobile telecommunication switch and call line
Connected to the mobile terminal in the area containing the current location of the mobile terminal
Correspondingly provided mobile communication exchanges and this mobile
Mobile telecommunication switch, said mobile terminal, telephone line and wireless
Connected via each line and send signals to the mobile terminal
Radio base station for receiving and various information about the mobile terminal
And a home location registration register that holds the
Communication exchange, said mobile communication exchange, said wireless base station
And the home location registration register are connected to each other through a common line
Various signals and messages are mutually transmitted by the signal system
In a mobile communication system equipped with a common line signaling network
In the incoming call connection method,The gateway mobile communication switch is the home location registration register.
The means for supplying the incoming call information read request to the
One for identifying the current position of the mobile terminal in response to the request.
Means for supplying a call message to the radio base station
Having The radio base station responds to the paging message.
When sending a page message to the mobile terminal
In response to the page response from the mobile terminal,
There is a means for returning the sage to the gateway mobile communication exchange.
And The barrier mobile telecommunication switch sends the call response message
In response, an IAM message, which is an address signal, is sent
Further having means for supplying to the mobile communication switching system
 Incoming call connection in mobile communication systems characterized by
method.