JPH10136433A - Circuit switching equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To perform circuit switching so that communication is possible even when a wireless mobile station belonging to a local network moves from an area on the local network side to an area on the public network side, and performs communication on the local network side Provided is a circuit switching device that can lower the unit price per line. SOLUTION: The public network has a location registration function of storing in a database location registration data indicating which of the location registration areas on the public network side the radio mobile station is located. The storage unit 12 stores location registration data indicating in which of the location registration areas on the local network the radio mobile station belonging to the local network is located. The location registration unit 11 updates the location registration data stored in the storage unit 12 with new location registration data indicating that the location registration data is located in any area on the local network side, and performs a location registration function of the public network. Activate and store the updated new location registration data in the database.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a circuit switching device, and more particularly, to a circuit switching device provided in a mobile communication system.

[0002]

2. Description of the Related Art In recent years, the demand for mobile communication such as a cellular phone and a personal handy phone system (PHS) has been rapidly increasing, and with this, a plurality of mobile communication operators have competed to expand the area where communication is possible. It is getting. In mobile communication, a communicable area is divided into a plurality of areas, and one or more radio base stations are provided for each area. Then, the circuit switching device makes a line connection with each wireless base station, and the wireless mobile station performs wireless communication with the nearest wireless base station,
Each wireless mobile station can perform communication at an arbitrary position in a communicable area.

[0003] However, since the radio mobile station arbitrarily moves between the areas, it is necessary for the network to always know in which area each radio mobile station is currently located. Therefore, a system / method has been developed in which position information of each wireless mobile station is sequentially registered so that communication can be performed even when the wireless mobile station moves between areas. For example, Japanese Unexamined Patent Publication No. Hei 5-218951 discloses a "local network system" in which each time a wireless mobile station moves between areas, the wireless mobile station registers its location with a wireless base station in the destination area. There is disclosed a system which can make and receive calls even when the user moves to an area. Patent No. 1
No. 920104 “mobile radio communication system” enables communication even if the radio mobile station moves to another area by the network centrally managing the position information of the radio mobile station.

[0004]

When another communication carrier attempts to newly set up a local network adjacent to the public network of an existing communication carrier, it moves between areas within the local network. In addition, it is required that communication be possible even if the wireless mobile station moves from an area in the local network to an area in the public network. Therefore, on the local network side, it is necessary to know not only the radio mobile station located on the local network side but also the area where the radio mobile station moved to the public network side is currently located, For example, a circuit switching device provided on the local network side must perform location registration of all wireless mobile stations belonging to the local network. But,
The process of registering the location of a wireless mobile station that has moved to the public network side has a large load, and as a result, there has been a problem that the unit price per line on the local network side is expensive.

Accordingly, an object of the present invention is to perform circuit switching so that communication is possible even when a radio mobile station belonging to a local network moves from an area on the local network side to an area on the public network side, and also performs local switching on the local network. It is an object of the present invention to provide a circuit switching device that can lower the unit price per line on the side.

[0006]

Means for Solving the Problems and Effects of the Invention The first invention has a plurality of communicable areas each including one or more radio base stations, and the radio mobile station is located in any of the areas. A public network having a location registration function of storing location registration data indicating whether or not it is located in a database, and a line connection function of connecting to a wireless base station belonging to itself based on the location registration data stored in the database, A local network having a plurality of communicable areas each including one or more wireless base stations,
A circuit switching apparatus for performing circuit switching of a wireless mobile station belonging to the local network, and stores location registration data indicating in which of the areas on the local network side the wireless mobile station belonging to the local network is located. And updating the location registration data stored in the storage means to new location registration data indicating that the location registration data is located in any area on the local network side, and activating the location registration function of the public network. Location registration means for storing new location registration data obtained by updating in a database, and local network interface means for line-connecting to a radio base station belonging to the local network based on the location registration data stored in the storage means When,
Public network interface means for connecting to the public network is provided.

As described above, the circuit switching apparatus of the first invention has a public network having a plurality of communicable areas each including one or more radio base stations, and a plurality of public networks each including one or more radio base stations. It is provided between a local network having a communicable area and performs circuit switching of wireless mobile stations belonging to the local network. The public network has a location registration function for storing location registration data indicating in which area of the area on the public network side the wireless mobile station is located, and a public network based on the location registration data stored in the database. It has a line connection function for connecting to a wireless base station belonging to a network. The storage means of the circuit switching device stores location registration data indicating in which area of the local network side the radio mobile station belonging to the local network is located. The location registration unit updates the location registration data stored in the storage unit with new location registration data indicating that the location registration data is located in any area on the local network side, and activates a location registration function of the public network. Then, the new location registration data obtained by updating is stored in the database. The local network interface connects to a wireless base station belonging to the local network based on the location registration data stored in the storage. The public network interface is connected to a public network via a line.

As described above, the circuit switching device stores the location registration data of the radio mobile station belonging to the local network and currently located on the local network side. At the same time, the data is updated to new location registration data indicating that it is located on the local network side, and stored in the database on the public network side. For a wireless mobile station that belongs to the local network but is currently located on the public network side, the database on the public network side stores the location registration data. And
If there is an outgoing / incoming call in the local network,
A line connection is made with a wireless base station belonging to the local network based on the stored location registration data. When there is an outgoing call to the public network, the circuit switching device connects to the public network, and the public network connects to a wireless base station belonging to the public network based on the location registration data stored in the database. . When there is an incoming call from the public network, the public network connects to the circuit switching device based on the new location registration data stored in the database, and the circuit switching device stores the stored location registration data. A line is connected to a wireless base station belonging to the local network based on the data. As a result, communication is possible even if a wireless mobile station belonging to the local network moves to an area on the public network side, and circuit switching is performed using the location registration function of the public network. Per unit price can be lower.

[0009] In a second aspect based on the first aspect, the location registration means instructs the storage means when the wireless mobile station having the location registration data stored in the storage means moves to an area on the public network side. The data is then deleted.

Thus, even though the radio mobile station has moved from the area on the local network side to the area on the public network side, the location registration data remains stored in the storage means, and the circuit switching can be performed correctly. It can be prevented from running out.

[0013] In a third aspect based on the second aspect, the location registering means compares the calling number included in the incoming call from the public network with that included in the location registration data stored in the storage means. It is characterized in that it is determined whether or not the radio mobile station has moved to an area on the public network side.

In a fourth aspect based on the second aspect, the location registering means periodically calls, via a public network, a radio mobile station having the location registration data stored in the storage means, It is characterized in that it is determined whether or not the wireless mobile station has moved to an area on the public network side based on the presence or absence of a response.

According to the third and fourth aspects, it is possible to easily determine whether or not the radio mobile station has moved from the area on the local network side to the area on the public network side.

In a fifth aspect based on the first aspect, the calling numbers of the radio mobile stations belonging to the local network are changed periodically, and the location registering means changes the calling number every time the calling numbers are changed.
It is characterized in that the location registration data including the calling number before the change is instructed to the storage means to be deleted.

Thus, the location registration data of the radio base station which has moved from the area on the local network side to the area on the public network side can be deleted from the storage means. Despite the movement to the area, it is possible to prevent the position registration data from being kept stored in the storage means, thereby preventing the circuit switching from being performed correctly.

According to a sixth aspect, in the first to fifth aspects,
The public network further has an authentication function of performing authentication at the time of location registration / line connection, and the location registration means performs a location registration function of the public network when the local network interface unit makes a line connection with a wireless base station belonging to the local network. It is characterized in that it is activated to authenticate the source and destination wireless mobile stations.

As described above, when there is an outgoing / incoming call in the local network, unauthorized communication can be prevented by activating the authentication function of the public network to authenticate the source and destination wireless mobile stations. In addition, since authentication is performed using the authentication function of the public network, the unit price per line on the local network side can be reduced.

According to a seventh aspect, the present invention has a plurality of communicable areas each including one or more radio base stations, and stores location registration data indicating in which of the areas the radio mobile station is located. A public network having a location registration function to be stored in a database, and a line connection function of connecting to a wireless base station belonging to itself based on the location registration data stored in the database; and a plurality of networks each including one or more wireless base stations. A circuit switching device provided between a local network having an area in which communication is possible and a circuit switching circuit for a wireless mobile station belonging to the local network. Storage means for storing position registration data indicating which area of the local network is located; and storing the position registration data stored in the storage means on the local network side. Location registration means for updating to new location registration data indicating that it is located in a certain area, and activating a location registration function of the public network, and storing the updated new location registration data in a database. Based on the location registration data stored in the storage means, at least one local network interface means for connecting to a radio base station belonging to a local network, at least one public network interface means for connecting to a public network, Location registration means, 1
A control bus for transmitting control information for the local network interface means and one or more public network interface means to operate in cooperation with each other;
The one or more local network interface means and the one or more public network interface means each include a bus access means for accessing a control bus and outputting control information.

As described above, the circuit switching apparatus according to the seventh aspect of the present invention includes a public network having a plurality of communicable areas each including one or more radio base stations, and a plurality of public networks each including one or more radio base stations. It is provided between a local network having a communicable area and performs circuit switching of wireless mobile stations belonging to the local network. The public network has a location registration function of storing location registration data indicating in which area the wireless mobile station is located in the area of the public network, and a public network based on the location registration data stored in the database. It has a line connection function for connecting to a wireless base station belonging to a network. The storage means of the circuit switching device stores location registration data indicating in which area of the local network side the radio mobile station belonging to the local network is located. The location registration unit updates the location registration data stored in the storage unit with new location registration data indicating that the location registration data is located in any area on the local network side, and activates a location registration function of the public network. Then, the new location registration data obtained by updating is stored in the database. At least one local network interface unit connects to a wireless base station belonging to the local network, based on the location registration data stored in the storage unit. One or more public network interface means is connected to the public network via a line. At that time, location registration means,
One or more local network interface means and a bus access means included in the one or more interface means respectively access the control bus, and the location registration means, one or more local network interface means and one or more public network interface means cooperate. Control information for the operation of each other.

As described above, the circuit switching device stores the location registration data of the wireless mobile station belonging to the local network and currently located on the local network side. At the same time, the data is updated to new location registration data indicating that it is located on the local network side, and stored in the database on the public network side. For a wireless mobile station that belongs to the local network but is currently located on the public network side, the database on the public network side stores the location registration data. And
If there is an outgoing / incoming call in the local network,
A line connection is made with a wireless base station belonging to the local network based on the stored location registration data. When there is an outgoing call to the public network, the circuit switching device connects to the public network, and the public network connects to a wireless base station belonging to the public network based on the location registration data stored in the database. . When there is an incoming call from the public network, the public network connects to the circuit switching device based on the new location registration data stored in the database, and the circuit switching device stores the stored location registration data. A line is connected to a wireless base station belonging to the local network based on the data. As a result, communication is possible even if the wireless mobile station belonging to the local network moves to the area on the public network side. In addition, since line switching is performed using the location registration function of the public network, the line on the local network side is used. Per unit price can be lower. Further, in the circuit switching device, since the location registration means, the one or more local network interface means and the one or more public network interface means operate in cooperation with each other while transferring control information to each other, efficient circuit switching can be performed. Therefore, the unit price per line on the local network side can be further reduced.

In an eighth aspect based on the seventh aspect, different node numbers are assigned to the bus access means, respectively, and the control bus is transmitting control information or transmitting the node number. Further comprising a control line for transmitting a signal for indicating whether or not the bus access means, which is accessing the control bus, transmits a signal indicating that the node number is being transmitted immediately after the transfer of the control information. And outputs its own node number to the control bus at the same time as it outputs the node number from the data bus at the timing when the signal is detected from the control line. And the node number and its own node number are 1
Is compared with a value obtained by adding..., And when they match, the access to the control bus is started.

As described above, in the eighth aspect, different node numbers are assigned to the respective bus access means, and among the respective bus access means, those accessing the control bus are those of the control information. Immediately after the transfer, a signal indicating that the node number is being transmitted is output to the control line, and at the same time, its own node number is output to the control bus. Those not accessing the control bus each fetch the node number from the control bus at the timing when the signal is detected from the control line, and add the node number and the value obtained by adding 1 to its own node number. If the two match, the access to the control bus is started. Thereby, it is possible to prevent the bus access means from competing for transferring the control information.

A ninth invention is characterized in that, in the eighth invention, one or more node numbers are assigned to the bus access means in accordance with the frequency of access to the control bus.

Thus, it is possible to prevent the control information from being efficiently transferred because the frequency of accessing the control bus differs for each bus access unit.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the circuit switching device according to the first embodiment of the present invention. The circuit switching device 1 of FIG.
1, storage unit 12, local network interface units 13 and 14, public network interface units 15 and 16,
A control bus 17 and an audio bus 18 are provided.

FIG. 2 is a block diagram showing a configuration of a personal handyphone system using the circuit switching device 1 of FIG. The system shown in FIG. 2 includes a circuit switching device 1, a public network 201, a database 202, and PHS base stations 221-2.
29 and PHS mobile stations 251-253. PHS
Each of the base stations 221 to 224 is an ISDN line 211
Through 214 to the public network 201. The PHS base stations 225 to 229 respectively have local lines 231 to 231.
The circuit switching apparatus 1 is connected to the public network 201 via ISDN lines 215 and 216. The database 202 is connected to the public network 201.

PHS base stations 221 and 222 are located in location registration area 241, PHS base stations 223 and 224 are located in location registration area 242, and PHS base stations 225 to 227 are located.
Belongs to the location registration area 243, and the PHS base stations 228 and 229 belong to the location registration area 244, respectively. The PHS mobile stations 251 to 253 are currently located in the location registration areas 242 to 244, respectively, but can be arbitrarily moved between the location registration areas 241 to 244, and the nearest PHS base stations 221 to 229 in each area. Is connected wirelessly. Note that the PHS base stations 221 to 224 belong to the public network 201, and the PHS base stations 225 to 229 and P
The HS mobile stations 251 to 253 belong to a local network.

The public network 201 has a location registration function for storing location registration data indicating in which location registration area the PHS mobile station is currently located in the database 202, and a public network based on the location registration data stored in the database 202. This is a communication network having a line connection function for connecting to a PHS base station belonging to the group and an authentication function for performing authentication at the time of location registration / line connection. The database 202 stores location registration data.

The storage unit 12 stores a P which is located on the local network side.
The location registration data of the HS mobile station is stored. Location register 1
1 updates the location registration data stored in the storage unit 12 with new location registration data indicating that it is located on the local network side, and activates and updates the location registration function of the public network 201. The obtained new location registration data is stored in the database 202. Local network interface unit 1
Lines 3 and 14 are respectively connected to PHS base stations (PHS base stations 225 to 229) belonging to the local network based on the location registration data stored in the storage unit 12.

Public network interface units 15 and 16
Are line-connected to the public network 201, respectively. Control bus 1
Reference numeral 7 denotes a location registration unit 11, local network interface units 13 and 14, and a public network interface unit 15.
And 16 communicate control information that is transferred to each other. The audio bus 18 transmits audio information.

FIG. 3 is a diagram showing the contents of the position registration data stored in the storage section 12 of FIG. 1 and the new position registration data stored in the database 202 of FIG. FIG.
As shown in (1), the location registration data includes a calling number and a registered area number, and the new location registration data includes a calling number and a single area number. FIG. 4 is a diagram showing a format of the position registration data stored in the storage unit 12 of FIG. The storage unit 12 stores the location registration data of the PHS mobile station located on the local network side in the format shown in FIG.

The operation of the apparatus shown in FIG. 1 for performing circuit switching in the system shown in FIG. 2 will be described below. First, an operation in which the public network 201 performs location registration will be described. P
The HS mobile station 251 is a mobile station belonging to the local network, but when moving to the public network side, the public network 201 performs location registration. The PHS mobile station 251 determines the nearest PH
By intermittently communicating with the S base station (here, the PHS base station 224), the self is currently located in the location registration area 24.
No. 2 is recognized. PHS mobile station 2
51 transmits the location registration data including the calling number and the registration area number of the location registration area 242 to the public network 201 via the PHS base station 224 and the ISDN line 214. The transmission of the location registration data is performed by the PHS mobile station 25.
1 is performed each time the user moves between the location registration areas 241-244. The public network 201 stores the received location registration data in the database 202.

Next, the operation of the circuit switching device 1 for performing location registration will be described. The PHS mobile station 252 recognizes that it is currently located in the location registration area 243 by intermittently communicating with the nearest PHS base station (here, the PHS base station 226). The PHS mobile station 252 transmits the location registration data including the calling number and the registration area number of the location registration area 243 to the PHS base station 22.
6 and the local line 232. The transmission of the location registration data is performed every time the PHS mobile station 252 moves between the location registration areas 241 to 244.

In the circuit switching device 1, the location registration unit 11
The transmitted location registration data is instructed and stored in the storage unit 12, and the location registration data is updated to new location registration data including a calling number and a single area number, as shown in FIG. The data is transmitted to the public network via the ISDN line 215. The storage unit 12 stores the location registration data in the format shown in FIG.
Stores the received new location registration data in the database 20.
Store it in 2.

Here, the single area number is a number given by regarding all the location registration areas on the local network side as a single area.
For the HS mobile station, the storage unit 12 stores the location information that distinguishes the location registration area, and the database 202 stores the location information indicating only that the mobile station is located on the local network side.

Next, the operation of the line switching device 1 for making a line connection will be described. Now, it is assumed that the location registration data is stored in the storage unit 12 of FIG. 1 and the database 202 of FIG. 2 as described above. At this time, when there is an outgoing / incoming call in the local network, for example, when there is a call from the PHS mobile station 253 to the PHS mobile station 252, the call is:
It is transmitted to the circuit switching device 1 via the PHS base station 229 and the local line 235. In the circuit switching apparatus 1, the location registration unit 11 transmits new location registration data including a calling number and a single area number included in the transmitted call as shown in FIG. 3 to the public via the ISDN line 215. Send to network side. As a result, the authentication function of the public network 201 is activated, and the public network 201 transmits the authentication request to the ISDN line 215.
To the circuit switching device 1 via

In the circuit switching apparatus 1, the public network interface unit 15 fetches the transmitted authentication request from the voice bus 18, and then receives the authentication request via the local network interface unit 13, the local line 235 and the PHS base station 229. To the PHS mobile station 253. PH
When the S mobile station 253 transmits an authentication response to the circuit switching device 1 via the PHS base station 229 and the local line 235, in the circuit switching device 1, the local network interface unit 13 takes in the authentication response, and then authenticates the authentication response. The response is transferred to the public network 201 via the public network interface unit 15 and the ISDN line 215. Upon receiving the authentication response, the public network 201 performs location registration, and the authentication of the transmission source is completed. Note that authentication is performed for the destination in the same manner.

When the authentication is completed, the local network interface unit 13 retrieves the location registration data of the PHS mobile station 252 from the storage unit 12 by searching for the called number included in the transmitted call. Next, the local network interface unit 13 instructs the PHS base station corresponding to the registration area number included in the read location registration data, that is, the PHS base stations 225 to 227, to make a call to the PHS mobile station 252, and thereafter, , PHS base station 2
26. Thereby, the PHS mobile station 253
And the PHS mobile station 252 can communicate with each other.

When there is a call from the public network to the local network, for example, a call from the PHS mobile station 251 to the PHS mobile station 252, the call is transmitted via the PHS base station 224 and the ISDN line 214 to the public network. It is transmitted to 201. The public network 201 performs authentication based on the calling number and the called number included in the transmitted transmission, and then searches the called number included in the transmission by searching the database 202 for the location registration data of the PHS mobile station 252. Is read. Then, the public network 201 makes a line connection with the circuit switching device 1 based on the single area number included in the read location registration data.

When the line is connected, the line switching device 1
The public network interface unit 15 is connected to the PHS mobile station 252.
Of the PHS mobile station 252 by retrieving the incoming call from the voice bus 18 and searching for the called number included in the incoming call.
Is read from the storage unit 12. Then
The local network interface unit 13 determines whether the PH corresponding to the registration area number included in the read location registration data is
It instructs the S base station, that is, the PHS base stations 225 to 227, to make an incoming call to the PHS mobile station 252, and then makes a line connection with the PHS base station 226. This allows
The PHS mobile station 251 and the PHS mobile station 252 can communicate.

When there is a call from the local network side to the public network side, for example, a call from the PHS mobile station 252 to the PHS mobile station 251, the call is transmitted via the PHS base station 226 and the local line 232. It is transmitted to the device 1. In the circuit switching device 1, the local network interface unit 13 takes in the transmitted call from the voice bus 18, and then searches for a called number included in the call. As a result of the search, if it is found that the PHS mobile station 251 is not located on the local network side, the public network interface unit 1
5 is connected to the public network 201 via a line.

When the line is connected, the public network 201 performs authentication based on the calling number and the called number included in the transmitted incoming call, and then searches the called number included in the incoming call, thereby obtaining the database 202. To PHS mobile station 2
The position registration data 51 is read. And the public network 20
1 indicates to the PHS base station corresponding to the registration area number included in the read location registration data, that is, the PHS base stations 223 and 224, and the PHS mobile station 251
, And then a line connection with the PHS base station 224 is made. Thereby, PHS mobile station 252 and PH
Communication with the S mobile station 251 becomes possible.

However, before moving to the public network side, the storage unit 1
If the location registration data of the PHS mobile station 251 stored in the storage unit 12 remains in the storage unit 12, the circuit switching device 1 cannot perform the circuit switching correctly. Therefore,
When determining that the PHS mobile station whose location registration data is stored in the storage unit 12 has moved to the public network side, the location registration unit 11 of FIG. 1 instructs the storage unit 12 to delete the location registration data. Let it.

The location registration unit 11 can determine that the PHS mobile station whose location registration data is stored on the local network has moved to the public network in the following manner. That is, the location registration unit 11 sequentially compares the calling number included in the incoming call from the public network with that stored in the storage unit 12, and as a result of the comparison, if the number is stored in the storage unit 12, It can be determined that the PHS mobile station of that number has moved to the public network side. In addition, the PHS mobile station whose location registration data is stored in the storage unit 12 is periodically called via the public network 201, and if there is a response, the location registration unit 11 determines that the PHS mobile station of that number is It can also be determined that it has moved to the public network side.

Further, the location registration unit 11 may periodically change the calling number of the PHS mobile station belonging to the local network. That is, when the calling number is changed, the position registration of each PHS mobile station is newly performed. Therefore, the position registering unit 11 instructs the storage unit 12 to delete the position registration data including the calling number before the change. What should I do?

As described above, according to the present embodiment, the circuit switching apparatus 1 registers the location of the PHS mobile stations (PHS mobile stations 252 and 253) belonging to the local network and currently located on the local network side. Store the data. At the same time, the data is updated to new location registration data indicating that it is located on the local network side, and stored in the database 202 on the public network side. The PHS mobile station (PHS mobile station) that belongs to the local network but is currently located on the public network side
For the mobile station 251), the public network database 2
02 stores the position registration data. Then, when there is an outgoing / incoming call (from the PHS mobile station 253 to the PHS mobile station 252) in the local network, the circuit switching apparatus 1 sets the PH belonging to the local network based on the stored location registration data.
The line is connected to the S base station (PHS base station 226).

Transmission from the local network to the public network (PH
If there is an S mobile station 252 to the PHS mobile station 251), the circuit switching apparatus 1 connects to the public network 201 via a line,
The public network 201 makes a line connection with a PHS base station (PHS base station 224) belonging to the public network 201 based on the location registration data stored in the database 202. When there is an incoming call from the public network to the local network (from the PHS mobile station 251 to the PHS mobile station 252), the public network 20
1 is connected to the circuit switching device 1 based on the new location registration data stored in the database 202, and the circuit switching device 1 uses the wireless base station (belonging to the local network based on the stored location registration data). PHS base station 226). Accordingly, communication is possible even if a wireless mobile station belonging to the local network moves to the area of the public network, and circuit switching is performed using the location registration function of the public network 201. Unit price per line can be reduced.

When there is an outgoing / incoming call (from the PHS mobile station 253 to the PHS mobile station 252) in the local network, the authentication function of the public network 201 is started to activate the source and destination wireless mobile stations (PHS mobile station). Authorization of the stations 253 and 252) can prevent unauthorized communication,
Since authentication is performed using the authentication function of the public network 201, the unit price per line on the local network side can be reduced.

In the first embodiment, the location registration unit 1
1. The description of the operation in which the local network interface units 13 and 14 and the public network interface units 15 and 16 mutually transfer control information via the control bus 17 is omitted. Therefore, in the second embodiment,
The operation will be described in detail.

(Second Embodiment) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG.
FIG. 4 is a block diagram illustrating a configuration of a circuit switching device according to a second embodiment of the present invention. The circuit switching apparatus 5 of FIG. 5 includes a location registration unit 51, a storage unit 52, local network interface units 53 and 54, public network interface units 55 and 56, a control bus 57, and a voice bus 58. The position registration unit 51 includes an information control unit 511 and a bus access unit 512. Local network interface unit 53 includes control unit 531, bus access unit 532, and transceiver unit 533. Local network interface unit 54 includes control unit 541, bus access unit 542, and transceiver unit 543. The public network interface unit 55 includes a control unit 551, a bus access unit 552, and a transceiver unit 553. The public network interface unit 56 includes a control unit 561, a bus access unit 562, and a transceiver unit 563.

The information control unit 511 includes the bus access unit 51
2 is controlled. The control unit 531 controls operations of the bus access unit 532 and the transceiver unit 533.
The control unit 541 controls operations of the bus access unit 542 and the transceiver unit 543. The control unit 551 controls the operations of the bus access unit 552 and the transceiver unit 553. The control unit 561 controls operations of the bus access unit 562 and the transceiver unit 563. Each of the bus access units 512, 532, 542, 552, and 562 accesses the control bus 57 to transmit and receive control signals. Transceiver units 533, 543, 553 and 5
63 transmit and receive audio signals via the audio bus 58, respectively. Location registration unit 51, storage unit 52, local network interface units 53 and 54, public network interface units 55 and 56, control bus 57, and voice bus 5.
8 perform the same operation as the corresponding component of the circuit switching apparatus 1 of FIG.

The operation in which the circuit switching device 5 of FIG. 5 performs circuit switching will be described below. The circuit switching device 5
Is provided in place of the circuit switching device 1 in the system of FIG. 2, and performs the same operation as that of the circuit switching device 1.
Here, the storage unit 52, the local network interface units 53 and 54 and the public network interface units 55 and 56 transmit control information via the control bus 57 only when there is a call from the local network to the public network. The operation of mutually transferring will be described. The transceiver unit 533 of the local network interface unit 53
Upon receiving the “call setup message” from the local network side via the communication network 8, the control unit 531 instructs the bus access unit 532 to search for an idle public network interface unit and request it to be notified. Request to control bus 5
7 to be transmitted to the position registration unit 51.

In the position registration unit 51, the bus access unit 51
When receiving the transmitted search request, the information control unit 51
1 retrieves the system data stored in the storage unit 52, and then instructs the bus access unit 512 to identify the empty public network interface unit obtained by the retrieval (here, the public network interface unit). The search response including the identification number 55 is transmitted to the local network interface unit 53 via the control bus 57.

In the local network interface unit 53,
When the bus access unit 532 receives the search response, the control unit 531 instructs the bus access unit 532 to transmit a “call setting message” to the public network interface unit 55 via the control bus 57. In the public network interface unit 55, when the bus access unit 552 receives the “call setup message”, the control unit 551 causes the transceiver unit 5
Instruct the terminal 53 to transfer the "call setting message" to the public network via the voice bus 58. When the link is established in this way, the source on the local network side and the destination on the public network side can communicate via the transceiver unit 533, the voice bus 58, and the transceiver unit 553.

As described above, the circuit switching device 5 transfers control information such as a search request / response and a "call setup message" to each other via the control bus 57, thereby allowing the location registration unit 51 and the local network interface unit 53 and 54
And the public network interface units 55 and 56
It can work in cooperation with each other. However, when the line is congested, it is conceivable that the bus access units of the above units compete with each other and the line switching is not performed correctly. In the following, an operation in which the bus access units 512, 532, 542, 552, and 562 access the control bus 57 in an independent and distributed manner to transfer control information in the circuit switching apparatus 5 without conflict will be described. .

FIG. 6 shows the circuit switching device 5 in which the bus access units 512, 532, 542, 552 and 562
Is a sequence diagram showing how control information is transferred via a control bus 57. FIG. In FIG. 6, a control line is provided in association with the control bus 57, and each bus access unit is driven in a distributed manner. Node-Nos 5 to 9 are bus access units 512, 532, 542, and 5 respectively.
52 and 562.

The bus access unit 512 (Node-No)
5) drives the control line to the high voltage (H) and outputs its own node number (5) to the control bus 57, the bus access units 532, 542, 552 and 562 drive the control bus 57 to the H level, respectively. At the specified timing, the node number is fetched from the control bus 57, and the number is compared with a value obtained by adding 1 to its own node number. As a result of the comparison, the bus access unit that matches them, that is, the bus access unit 532 (Node-No6) next obtains the bus use right.

When the bus access right is obtained, the bus access unit 53
2 drives the control line to a low voltage (L) and outputs control information (Data) to the control bus 57. When the bus access unit 532 terminates the data transfer and drives the control line to H and outputs its own node number (6) to the control bus 57, the bus access units 512 and 54
2, 552 and 562 respectively have the control bus 57
The node number is fetched from the control bus 57 at the timing when the node number is driven, and the number is compared with a value obtained by adding 1 to its own node number. As a result of the comparison, the bus access unit in which both match, that is, the bus access unit 542 (Node-
No. 7) then obtains the right to use the bus.

Even if the right to use the bus is obtained, the bus access unit 54
No. 2 does not perform the operation of driving the control line to L and outputting Data to the control bus 57 because there is no data to be transferred. When the bus access unit 542 drives the control line to H and outputs its own node number (7) to the control bus 57, the bus access units 512, 532, 552 and 56
2 fetches a node number from the control bus 57 at the timing when the control bus 57 is driven to H, and compares the number with a value obtained by adding 1 to its own node number. As a result of the comparison, the bus access unit in which both match, that is, the bus access unit 552 (Node-No8), obtains the bus use right next.

Even if the bus access right is obtained, the bus access unit 55
2 indicates that there is no data to be transferred,
And the operation of outputting Data to the control bus 57 is not performed. When the bus access unit 552 drives the control line to H and outputs its own node number (8) to the control bus 57, the bus access units 512, 532, 542, and 5
Each of the nodes 62 fetches a node number from the control bus 57 at the timing when the control bus 57 is driven to H, and compares the number with a value obtained by adding 1 to its own node number. As a result of the comparison, the bus access part in which both match, that is,
Next, the bus access unit 562 (Node-No9) acquires the right to use the bus.

When the bus access right is obtained, the bus access unit 56
2 drives the control line to L and controls the control bus 57
Is output to the. When the transfer of Data is completed,
The bus access unit 562 drives the control line to H and outputs its own node number (9) to the control bus 57. If the bus access unit 562 is set to output a value obtained by subtracting 1 from the minimum node number (here, 4) instead of its own node number, the above operation is repeated.

As described above, according to the present embodiment, the first
In the embodiment of the present invention, the location registration unit 51, the local network interface units 53 and 54 and the public network interface units 55 and 56 operate in cooperation with each other while transferring control information to each other. Therefore, the unit price per line on the local network side can be further reduced.

Each bus access unit (512, 53)
2, 542, 552, and 562) are respectively assigned different node numbers, and among the bus access units,
The device accessing the control bus 57 drives the control line to a high voltage immediately after the transfer of the control information to indicate that the node number is being transmitted and, at the same time, outputs its own node number to the control bus 57. Those other than those accessing the control bus 57 fetch their node numbers from the control bus 57 at the timing of detecting that the control lines are driven to a high voltage, and add 1 to their node numbers and their own node numbers.
Are added to the control bus 57, and when they match, the access to the control bus 57 is started.
This can prevent each bus access unit from competing for transferring control information.

Each bus access unit (512, 53)
2, 542, 552, 562) must access the control bus 57 generally at different frequencies. For example, in the above case, the access frequency of the bus access unit 512 is considered to be higher than that of the other bus access units. Therefore, by giving each bus access unit a number of nodes corresponding to the access frequency, it is possible to prevent the control information from being efficiently transferred because the frequency to access the control bus 57 is different for each bus access unit. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a circuit switching device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a personal handyphone system using the circuit switching device 1 of FIG.

FIG. 3 is a diagram showing contents of position registration data stored in a storage unit 12 of FIG. 1 and new position registration data stored in a database 202 of FIG. 2;

FIG. 4 is a diagram showing a format of position registration data stored in a storage unit 12 of FIG.

FIG. 5 is a block diagram showing a configuration of a circuit switching device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing bus access units 512, 532, and 54 of FIG. 5;
FIG. 5 is a sequence diagram showing a state in which 2, 552 and 562 access a control bus 57 and perform data transfer.

[Explanation of symbols]

1, 5 Circuit switching device 11, 51 Location registration unit 12, 52 Storage unit 13, 14, 53, 54 Local network interface unit 15, 16, 55, 56 Public network interface unit 17, 57 Control bus 18, 58 Voice bus 201 Public network 202 Database 211 to 216 ISDN line 221 to 229 PHS base station 231 to 235 Local line 241 to 244 Location registration area 251 to 253 PHS mobile station 511 Information control unit 512, 532, 542, 552, 562 Bus access unit 533, 543, 553, 563 Transceiver unit 531, 541, 551, 561 Control unit

Claims (9)

[Claims] 1. A database having a plurality of communicable areas each including one or more radio base stations, and storing location registration data indicating which of the areas the radio mobile station is located in the database. A public network having a position registration function and a line connection function of connecting to a wireless base station belonging to the own base based on the position registration data stored in the database; and a plurality of communicable networks each including one or more wireless base stations. A circuit switching device provided between a local network having an area and performing circuit switching of a wireless mobile station belonging to the local network, wherein the wireless mobile station belonging to the local network is included in an area of the local network. Storage means for storing position registration data indicating which area is located; and storing the position registration data stored in the storage means in the local network. And updates the new location registration data indicating that it is located in any of the areas, and activates the location registration function of the public network, and stores the updated new location registration data in the database. Position registration means, based on the position registration data stored in the storage means,
A circuit switching device comprising: local network interface means for connecting to a wireless base station belonging to the local network; and public network interface means for connecting to the public network. 2. The location registering means, when a wireless mobile station whose location registration data is stored in the storage means moves to an area on the public network side, instructs the storage means to delete the data. The circuit switching device according to claim 1, wherein: 3. The wireless communication system according to claim 1, wherein the location registration unit compares the calling number included in the incoming call from the public network with that included in the location registration data stored in the storage unit. 3. The circuit switching apparatus according to claim 2, wherein it is determined whether or not the mobile terminal has moved to an area on the network side. 4. The location registering means periodically calls, via the public network, a radio mobile station whose location registration data is stored in the storage means, and determines whether or not there is a response to the radio mobile station. 3. The circuit switching device according to claim 2, wherein it is determined whether a mobile station has moved to an area on the public network side. 5. The calling number of a wireless mobile station belonging to the local network is periodically changed, and the location registering means updates location registration data including the calling number before the change each time the calling number is changed. 2. The circuit switching device according to claim 1, wherein the circuit switching device is instructed to delete the data. 6. The public network further includes an authentication function for performing authentication at the time of location registration / line connection, and the location registration unit connects the local network interface unit to a wireless base station belonging to the local network. In this case, a location registration function of the public network is activated to authenticate a source and destination wireless mobile station.
5. The circuit switching device according to any one of 5. 7. A plurality of communicable areas each including one or more radio base stations, and location registration data indicating which of the areas the radio mobile station is located in is stored in a database. A public network having a position registration function and a line connection function of connecting to a wireless base station belonging to the own base based on the position registration data stored in the database; and a plurality of communicable networks each including one or more wireless base stations. A circuit switching device provided between a local network having an area and performing circuit switching of a wireless mobile station belonging to the local network, wherein the wireless mobile station belonging to the local network is included in an area of the local network. Storage means for storing position registration data indicating which area is located; and storing the position registration data stored in the storage means in the local network. And updates the new location registration data indicating that it is located in any of the areas, and activates the location registration function of the public network, and stores the updated new location registration data in the database. Position registration means, based on the position registration data stored in the storage means,
At least one local network interface unit for connecting to a line with a wireless base station belonging to the local network; at least one public network interface unit for connecting to a line with the public network; the location registering unit; and the one or more local network interface units And a control bus for transmitting control information for the at least one public network interface unit to operate in cooperation with each other, the location registration unit, the one or more local network interface units, and the one or more public network interface units Are circuit switching devices each including bus access means for accessing the control bus and outputting control information. 8. The bus access means is provided with node numbers different from each other, and transmits a signal indicating whether the control bus is transmitting control information or transmitting a node number. The bus access means, which is accessing the control bus, outputs a signal indicating that the node number is being transmitted to the control line immediately after the transfer of the control information. Of the bus access means other than accessing the control bus, each of the bus access means fetches the node number from the data bus at a timing when the signal is detected from the control line. , And the node number is compared with a value obtained by adding 1 to its own node number. 8. The circuit switching device according to claim 7, wherein in said case, access to said control bus is started. 9. The circuit switching apparatus according to claim 8, wherein one or more node numbers are assigned to said bus access means in accordance with a frequency with which said control bus is to be accessed. .