JP3291131B2 - 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 general paging activation system in a mobile communication system.

[0002]

2. Description of the Related Art In a conventional simultaneous call activation method,
This will be described with reference to the mobile communication system shown in FIG. FIG.
In the figure, 1 is a mobile device, a home network 2 is a network to which the mobile device 1 is contracted to receive communication service, and a visited network 3
Is the network in which the mobile device 1 is located, the communication network 4 is the home network 2,
This is a different network from the visited network 3.

In the home network 2, when the mobile unit 1 is roaming to a network other than the home network, the mobile unit 1
Is a home location register that stores the network address of the network in which is located.

[0004] In the visited network 3, a gateway exchange 6 is a switching office for making a line connection between the visited network 3 and another network, and a mobile switching center 7.
Is a switching center for performing line setting and call control with the mobile station 1, base stations 8a and 8b are stations connected to the mobile switching center 7,
The wireless zones 9a and 9b are wireless zones formed by the base stations 8a and 8b, respectively, the location registration area 10 is comprised of wireless zones 9a and 9b, an area which is a unit of simultaneous call, and the visitor location register 11 is located in the visited network 3. For each roaming mobile station, the location information in the visited network 3 (that is, the identifier of the location registration area (location registration area I
D) and a register for storing the mobile exchange ID of the mobile exchange included in the location registration area, and a communication line 12 is a communication line between the gateway exchange 2 and the mobile exchange 7, and lines 13a and 13a.
Reference numeral 3b denotes a line for transmitting communication information and control information between the mobile switching center 7 and the base stations 8a and 8b, and a signal line 14 respectively.
Reference numerals a and 14b denote signal lines for transmitting control signals between the gateway exchange 2 and the mobile exchange 3 and the visitor location register 11, respectively.

In the communication network 4, reference numeral 15 denotes an exchange,
The terminal 16 is a terminal connected to the exchange 15.

A signal line 17 transmits a control signal between the home location register 5 and the exchange 15, and a line 18 transmits communication information between the exchange 15 and the gateway 6. It is.

In the conventional system, when a terminal 16 connected to the exchange 15 originates a call to the mobile station 1, the exchange 16
Sends a routing information inquiry signal including the mobile station number assigned to the mobile station 1 to the home location register 5 via the signal line 17 in order to obtain the routing information necessary for routing the call.

The home location register 5 which has received the signal obtains the network address of the visited network 3 in which the mobile station 1 is located based on the mobile station number included in the signal, and exchanges this with the routing information inquiry response signal. to <br/> back to the station 15.

The exchange 15 receiving the response signal analyzes the network address of the visited network 3 contained in the response signal, selects the line 18 to the gateway exchange 6 of the visited network 3, and 6
The terminal 16 is connected to the communication line 18 by transmitting an address signal indicating that the line 18 has been selected. The address signal includes the network address and the mobile station number of the mobile station 1.

[0010] The gateway exchange 6 receiving the address signal
Knows from the network address contained in the address signal and the mobile station number of the mobile station 1 that the routed call is a call to the mobile station 1 located in its own network.
A routing information inquiry signal including the mobile station number of the mobile station 1 is sent to the visitor location register 11 via the signal line 14a in order to obtain the routing information of the call through a.

The visitor location register 11 having received the inquiry signal uses the mobile station number of the mobile station 1 included in the signal to register the location registered in the location registration area 10 where the mobile station 1 is located. The mobile station 1 obtains the area ID and the mobile switching center ID of the mobile switching center 7 included in the location registration area 10, and determines which wireless zone the mobile device 1 is located in with respect to the mobile switching center 7. A paging request signal including the location registration area ID and the mobile unit number of the mobile unit 1 is transmitted to the mobile switching center 7 via the signal line 14b to instruct execution of the paging.

The mobile switching center 7 having received the paging request signal includes the mobile station number of the mobile station 1 through the lines 13a and 13b to the base stations 8a and 8b included in the location registration area included in the signal. The base stations 8a and 8b transmit the paging signals to the wireless zones 9a and 9b, respectively.

Upon receiving the paging signal, the mobile station 1 returns a paging response signal corresponding to the paging signal to the base station 8a (where the mobile station 1 is located in the wireless zone 8a). Assume that). The base station 8a
The mobile switching center 7 sends a paging response signal including routing information enabling the routing of a call to the own station via the line 13a to the mobile switching center 7, and returns this to the visitor location register 11 via the signal line 14b. I do.

The visitor location register 11 returns the routing information included in the paging response signal to the base station 8a to the gateway exchange 6 via a signal line 14a as a routing information inquiry response signal.

The gateway exchange 6 selects a communication line 12 with the mobile exchange 7 based on the routing information, and sends an address signal including the routing information to the base station 8 a to the mobile exchange 7. The transmission is performed, and the communication line 18 and the communication line 12 are connected.

The mobile switching center 7 which has received the address signal
Analyzes the routing information included in the signal, selects a line 13a to the base station 8a, sends an incoming signal to the base station 8a, and connects the communication line 12 to the line 13a. The base station 8a sends the incoming signal to the mobile device 1, and the incoming to the mobile device 1 is performed.

[0017]

As described above,
In the conventional method, it is necessary to set up a line to the terminating network in order to execute the simultaneous calling of the mobile device in the network where the mobile device is located, and the mobile device cannot be used because the power of the mobile device is turned off. Even in this case, there is a problem that the line up to the receiving network is invalidated and held.

Further, in the conventional method, since only the address of the network where the mobile station is located is obtained by accessing the home location register, it is necessary to select the nearest line from the exchange 15 to the visited network 3. There is a problem that even if an optimal route to the destination mobile switching center 7 exists, it cannot be selected.

The present invention has been made in view of the above,
The purpose is that when the mobile station cannot respond to the paging call, it does not invalidate and hold the line to the visited network, and the mobile station is located from the exchange that inquired the routing information to the home location register. The present invention is to provide a simultaneous call starting method capable of selecting an optimum route to a mobile switching center.

[0020]

In order to achieve the above object, the present invention relates to a mobile station which , when moved to a visited network which is another mobile communication network, stores the visited network in a home location register of the mobile station. set the routing information to, and sets the position information in said mobile station within-area network to the visitor location register of the within-area network, located within the visited network the mobile
A mobile communication system that routes calls addressed to
The first exchange that has received the call addressed to the mobile station
To the mobile station for the home location register
Routing information for querying routing information
Sends an inquiry signal to the home location
Based on the routing information to the visited network,
The above routine for the visitor location register
Transmitting a visitor location inquiry signal,
The routing register inquires of the received routing information.
In response to the signal, the location information of the mobile device in the visited network
Sending a paging signal via the corresponding second exchange
The visitor location register stores the broadcast call
Routine to the mobile station as a response to the
Receiving the visit information, the visitor location register
The routing information to the mobile station;
The home location as a response to an inquiry signal;
Reply to the location register
A register stores routing information to the mobile station.
As a response to the
1 exchange, and the first exchange exchanges
According to the routing information to the mobile station,
The point is to route the call .

According to the present invention, when an inquiry about routing information is made to route a call to a mobile station, the home location register makes an inquiry about the routing information to a visitor location register of a network in which the mobile station is located. The visitor location register executes a paging call of the mobile station based on the inquiry.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a mobile communication system that implements a general call activation method according to an embodiment of the present invention. The system shown in the figure changes the functions of the home location register and the visitor location register from those shown in FIG.
And 111, and the only difference is that a signal line 19 for transferring a control signal is provided between the home location register 51 and the visitor location register 111. Other configurations are the same. The same components as those described above are denoted by the same reference numerals, and description thereof will be omitted.

More specifically, in addition to the above-described functions described with reference to FIG. 4, the home location register 51 stores the location information of the mobile station when an inquiry about routing information for routing a call to the mobile station is made. A new function is provided for making an inquiry about routing information to the visitor location register 111 of the network, and the visitor location register 111 is capable of responding to the inquiry from the home location register 51 in addition to the function described in FIG. It has a new function to execute simultaneous paging of the mobile device based on it.

The configuration of the home location register 51 will be described with reference to FIG. In FIG. 2, a control circuit 20 is a circuit for controlling each part of a home location register 51, 21 is a memory, a signal circuit 22 is a circuit for transmitting and receiving signals to and from another node (exchange station, visitor location register, etc.), a network address. A table 23 is included in the memory 21 and stores a network address of a network in which the mobile station is located for each mobile station. An address conversion table 24 is included in the memory 21 and includes a network address and a signal of a visitor location register. 9 is a table for storing correspondence with addresses.

Next, the operation of the present embodiment will be described with reference to an operation flow example of the home location register 51 shown in FIG.

In FIG. 1, when a terminal 16 connected to the exchange 15 makes a call to the mobile station 1, the exchange 15 sends a signal to obtain routing information necessary for routing the call. A routing information inquiry signal including the mobile station number assigned to the mobile station 1 is sent to the home location register 51 via the line 17 (FIG. 3).
Step 110).

The above signal is transmitted to the home location register 5
One signal circuit 22 receives the signal and sends it to the control circuit 20.
The control circuit 20 searches the network address table 23 using the mobile station number included in the signal (step 120), and obtains the network address of the visited network 3 in which the mobile station 1 is located. Next, the address conversion table 24 is searched using the obtained network address, and the signal address of the visitor location register 111 of the visited network 3 is obtained (step 130). The control circuit 20 edits the routing information inquiry signal including the mobile unit number of the mobile unit 1 and converts the signal into the visitor location register 111 based on the obtained signal address.
Is sent to the visitor location register 111 via the signal line 19 (step 140).

The visitor location register 111 that has received the inquiry signal uses the mobile station number of the mobile station 1 included in the signal to register the location registered in the location registration area 10 where the mobile station 1 is located. The mobile station 1 obtains the area ID and the mobile switching center ID of the mobile switching center 7 included in the location registration area 10, and determines which wireless zone the mobile device 1 is located in with respect to the mobile switching center 7. A paging request signal including the location registration area ID and the mobile unit number of the mobile unit 1 is transmitted to the mobile switching center 7 via the signal line 14b to instruct execution of the paging.

The mobile switching center 7 which has received the paging request signal includes the mobile station number of the mobile station 1 through the lines 13a and 13b to the base stations 8a and 8b included in the location registration area included in the signal. The base stations 8a and 8b transmit the paging signals to the wireless zones 9a and 9b, respectively.

When mobile station 1 receives the paging signal, it returns a paging response signal corresponding to the paging signal to base station 8a (step 150) (where mobile station 1 is located in radio zone 8a). Assuming that you are). The base station 8a sends a paging response signal including routing information capable of routing a call to the local station via the line 13a to the mobile switching center 7, and the mobile switching center 7 transmits the paging response signal via the signal line 14b to the visitor. Location register 1
Return to 11.

The visitor location register 111 which has received the general call response signal returns a routing information inquiry response signal including the routing information to the home location register 51.

The signal circuit 22 of the home location register 51 which has received the routing information inquiry response signal
Sends the signal to the control circuit 20. The control circuit 20 edits a routing information inquiry response signal including the routing information to the base station 8a, and returns the signal to the switching center 15 to the signal circuit 22. And the signal is returned to the exchange 15 via the signal line 17 (step 16).
0).

The exchange 15 receiving the response signal analyzes the routing information to the base station 8a contained in the response signal, selects the line 18 to the gateway exchange 6 of the visited network 3, and selects the gateway exchange. An address signal indicating that the line 18 has been selected is transmitted to the terminal 2, and the terminal 16 and the communication line 18 are connected. The address signal includes the routing information to the base station 8a and the mobile station number of the mobile station 1.

The gateway exchange 6 that has received the address signal
Selects a communication line 12 with the mobile switching center 7 based on the routing information to the base station 8a included in the address signal, transmits an address signal including the routing information to the mobile switching center 7, The communication line 18 and the communication line 12 are connected.

The mobile switching center 7 receiving the address signal
Analyzes the routing information to the base station 8a included in the signal, selects the line 13a to the base station 8a,
a to the communication line 12 and the line 1
3a is connected. The base station 8a sends the incoming signal including the mobile station number of the mobile station 1 to the mobile station 1, and the incoming call to the mobile station 1 is performed.

[0037]

As described above, according to the present invention,
When there is an inquiry about routing information to route a call to the mobile station, the home location register makes an inquiry about the routing information to the visitor location register of the network where the mobile station is located, and the visitor location register responds to the inquiry. The paging is performed before the incoming call to the mobile device is routed to the visited network of the mobile device, such as executing the paging of the mobile device based on the paging. Thus, the call can be immediately released, and an invalid line hold up to the visited network can be avoided. In addition, since the final routing information can be obtained as a response to the inquiry to the home location register of the mobile device, it is possible to select an optimal route from the exchange inquiring about the routing information to the mobile device and route the call. it can.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a mobile communication system that implements a paging activation method according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a home location register used in the embodiment of FIG.

FIG. 3 is a flowchart showing an operation of a home location register shown in FIG. 2;

FIG. 4 is a diagram showing a configuration of a mobile communication system for explaining a conventional general paging activation method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mobile device 2 home network 3 visiting network 4 communication network 6 gateway exchange 7 mobile exchange 8a, 8b base station 9a, 9b wireless zone 15 exchange 16 terminal 51 home location register 111 visitor location register

Continuation of the front page (56) References JP-A-5-63640 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B ^7/ 24-7/26 113 H04Q ^7/ 00- 7/38

Claims (1)

(57) [Claims] When a mobile device moves to a visited network which is another mobile communication network, routing information for the visited network is set in a home location register of the mobile device, and visitor location of the visited network is set. It sets the position information in the within-area network of the mobile station to register, located in the visited network the mobile
A mobile communication system that routes calls addressed to
Te, first switching center receives a call of the mobile station addressed to said host
To the mobile location register.
Querying routing information to inquire routing information
Sends a matching signal, and the home location register sends a route to the visited network.
The visitor location register based on the
Sends the routing information inquiry signal to the
The visitor location register stores the received
In response to a timing information inquiry signal,
Via a second exchange corresponding to the location information in the visited network,
Sending a general call signal, and the visitor location register stores the general call
Routing information to the mobile station as a response to a signal
And the visitor location register stores a route to the mobile station.
The routing information as the routing information inquiry signal.
Response to the home location register.
The home location register determines that a route to the mobile station is
The routing information as the routing information inquiry signal.
To the first exchange as a response to the first exchange, and the first exchange sends routing information to the mobile station.
Accordingly, it is characterized in that a call addressed to the mobile station is routed.
Mobile communication system.