JPH10322755A - Radio communication system and remote control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily enlarge the service range of a radio communication system without newly installing an expensive mobile communication exchange device. SOLUTION: Radio base stations 1 and 11 are connected with the mobile communication exchange device 2 through ISDN networks 4 and 15. A base station controller 12 is provided between the radio base stations 1 and 11 and the ISDN networks 4 and 15. A protocol conversion device 14 is installed between the mobile communication exchange device 2 and the ISDN networks 4 and 15 and the mobile communication exchange device 2 remotely controls the radio base stations 1 and 11. The radio base stations 1 and 11 are connected to the base station controller 12 and the protocol conversion device 14 to the mobile communication exchange device 2 through interfaces only for mobile object communication. The base station controller 12 is connected to the ISDN networks 4 and 15 and the ISDN networks 4 and 15 to the protocol conversion device 14 through I interfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system for performing mobile communication such as a personal handy phone system (PHS) or a portable telephone, and an ISD for the radio base station.
The present invention relates to a remote control method for installing a remote location via an N network.

[0002]

2. Description of the Related Art FIG. 8 shows a configuration example of a conventional radio communication system. In the figure, a wireless base station 1 and a mobile communication switching device 2 are connected via a metallic line 3. The mobile communication switching device 2 is connected to an ISDN network 4 and
A telephone 5 is connected to the DN network 4. The wireless base station 1 forms a wireless zone 7, and the mobile terminal 6 and the wireless base station 1 in the wireless zone 7 are connected via a wireless line. The mobile communication switching device 2 is connected to a location information database 8 that holds location information of the mobile terminal 6.

Here, the mobile communication switching device 2 and the ISDN
The network 4 is connected via an I interface. The wireless base station 1 and the mobile communication switching device 2 are connected via an I 'interface dedicated to mobile communication conforming to the I interface. The I 'line between the wireless base station 1 and the mobile communication switching device 2 includes a mobile terminal 6 in a normal ISDN line.
A location registration signal for registering the location in the mobile communication switching device 2 is added.

[0004]

By the way, when the length of the metallic line 3 becomes 7 km or more, the signal is attenuated, and communication between the radio base station 1 and the mobile communication switching device 2 becomes impossible. That is, the wireless base station 1 cannot be installed at a position more than 7 km away from the mobile communication switching device 2. Therefore, in order to expand the service range by arranging the wireless base station 1 in a wide range, a number of expensive mobile communication switching devices 2 must be installed accordingly, which increases the cost of the entire wireless communication system. become.

An object of the present invention is to provide a radio communication system and a remote control method capable of easily expanding the service range of a radio communication system without newly installing an expensive mobile communication switching device. I do.

[0006]

The radio communication system of the present invention connects a radio base station and a mobile communication switching device via an ISDN network. At this time, a base station control device is provided between the radio base station and the ISDN network, a protocol converter is provided between the mobile communication switching device and the ISDN network, and the mobile communication switching device communicates wirelessly via the ISDN network. Remotely control the base station.

Here, the connection between the radio base station and the base station controller, and the connection between the protocol conversion device and the mobile communication switching device are via a dedicated mobile communication interface. Between the base station controller and the ISDN network, and
The DN network and the protocol converter are connected via an I interface. Therefore, the base station control device and the protocol conversion device include means for converting the I interface and the dedicated mobile communication interface to each other, means for packetizing control information not defined by the I interface and transferring the packet to the ISDN network, Means for converting the converted data into the original control information and transferring it to the radio base station or the mobile communication switching device.

Thus, of the control information transferred between the radio base station and the mobile communication switching device, the control information not defined by the I interface is transmitted between the base station control device and the protocol conversion device. ISD as packet information
The transfer can be performed by using the N channels of the D channel.

[0009]

FIG. 1 shows a wireless communication system according to a first embodiment of the present invention. In the figure, a radio base station 1
1 and the base station controller 12 are connected via a metallic line 13. The base station controller 12 and the protocol converter 14 are connected via an ISDN network 15. The protocol conversion device 14 and the mobile communication switching device 2 are connected via a metallic line 16. On the other hand, the wireless base station 1 and the mobile communication switching device 2 are connected via a metallic line 3. The mobile communication switching device 2 is connected to an ISDN network 4, and a telephone 5 is connected to the ISDN network 4. The wireless base station 11 forms the wireless zone 7 and the wireless zone 7
The mobile terminal 6 and the wireless base station 11 are connected via a wireless line. The mobile communication switching device 2 is connected to a location information database 8 that holds location information of the mobile terminal 6.

[0010] A location registration signal not defined by ISDN is transferred between the radio base station 11 and the mobile communication switching device 2. Therefore, a fixed-line dedicated line (PVC) using an ISDN line control channel (D channel) for transferring packet data is set between the base station controller 12 and the protocol converter 14, and the position is set. The registration signal is transmitted over the packet line.

The base station controller 1 of the radio base station 11
2 is the same as that of the conventional mobile communication switching device 2. The interface of the mobile communication switching device 2 with respect to the protocol conversion device 14 is the same as that of the conventional wireless base station. Therefore, the wireless base station 11 and the mobile communication switching device 2
Can be used as it is.

FIG. 2 shows a configuration example of the base station controller 12. In the figure, the base station controller 12 is a radio base station 1
I 'interface unit 21 connected to
It comprises an I interface unit 22 connected to the network 15, and a signal control unit 23 for performing I interface control, I 'interface control, X.25 protocol control, protocol conversion and the like.

The I 'interface unit 21 controls the layers 1 and 2 of the control channel (D channel) of the I' line, transmits and receives signals of layer 3 to and from the signal control unit 23, and transmits information of the information channel (B channel). It is taken out and transmitted to and received from the I interface unit 22. The I interface unit 22
The control of layers 1 and 2 of the control channel (D channel) of the DN and the signal of layer 3 are transmitted and received to and from the signal control unit 23, the information of the information channel (channel B) is extracted, and the information is transmitted and received to and from the I 'interface unit 21. Here, since the information channel (B channel) signal does not need to be changed, it is directly transferred between the I ′ interface unit 21 and the I interface unit 22.

FIG. 3 shows a configuration example of the protocol converter 14. In the figure, the protocol conversion device 14
An I interface unit 31 connected to the DN network 15, an I 'interface unit 32 connected to the mobile communication switching device 2, a phase adjustment circuit 33 connecting the I interface unit 31 and the I' interface unit 32, The signal control unit 34 performs I interface control, I 'interface control, X.25 protocol control, protocol conversion, and the like.

The I interface unit 31 controls the layers 1 and 2 of the ISDN control channel (D channel), transmits and receives signals of the layer 3 to and from the signal control unit 34, extracts information of the information channel (B channel), It transmits to and receives from the adjustment circuit 33. The I 'interface unit 32 controls the layers 1 and 2 of the control channel (D channel) of the I' line, transmits and receives signals of the layer 3 to and from the signal control unit 34, and transmits information of the information channel (B channel) to the phase adjustment circuit 33. Here, since the signal of the information channel (B channel) does not need to be changed, it is transferred as it is between the I interface unit 31 and the I 'interface unit 32. Since there is a phase difference, the phase adjustment circuit 33 adjusts the phase difference.

Hereinafter, the radio communication system (PH) of the present invention will be described.
The operations of (1) location registration, (2) outgoing call, and (3) incoming call in S) will be described with reference to FIGS. In the figure, solid arrows indicate control signals for the ISDN and PHS networks, and broken arrows indicate PVC packet data signals. (1) Location Registration FIG. 4 shows an example of location registration operation, in which the location information of the mobile terminal 6 is registered in the location information database 8 of the mobile communication switching device 2.

When the location registration request signal transmitted from the portable terminal 6 is received by the radio base station 11, the radio base station 11 sends the registration (location registration request) signal to the base station controller 12 as a signal on the I 'line. Forward. The base station controller 12 converts this signal into a packet data signal of the PVC line and
It is sent to the SDN network 15. This packet data signal is received by the protocol converter 14, converted into a registration (position registration request) signal which is an original I ′ line signal, and transferred to the mobile communication switching device 2.

The switching device 2 for mobile communication transfers this signal to the location information database 8. The location information database 8 requests the mobile communication switching device 2 for authentication. The mobile communication switching device 2 converts a facility (authentication request) signal into a protocol conversion device 1 as an I 'line signal.
Transfer to 4. The protocol converter 14 converts this signal into a packet data signal of a PVC line and sends it to the ISDN 15. This packet data signal is received by the base station controller 12, converted into a facility (authentication request) signal, which is the original I ′ line signal, and transferred to the radio base station 11. Upon receiving this signal, the wireless base station 11 transmits an authentication request signal to the mobile terminal 6.

The authentication response signal from the portable terminal 6 is transferred to the location information database 8 of the mobile communication switching device 2 in the same procedure as the location registration request signal. The release completion (location registration response) signal from the mobile communication switching device 2 is transferred to the portable terminal 6 in the same procedure as the facility (authentication request) signal. Thus, the location registration is completed. (2) Outgoing call FIG. 5 shows an example of the operation of the outgoing call.
Is shown.

When the call setting signal transmitted from the portable terminal 6 is received by the radio base station 11, the radio base station 11 transmits a call setting accepting signal to the portable terminal 6, and transmits a call setting signal to the base station controller 12. Send a signal. Base station controller 12
Transfers this call setting signal to the ISDN 15. IS
Upon receiving the call setting signal, the DN network 15 sends a call setting accepting signal to the base station controller 12, and the base station controller 12 transfers the call setting accepting signal to the radio base station 11.

On the other hand, the call setting signal sent to the ISDN 15 is received by the protocol converter 14 and further transferred to the mobile communication switching device 2. Mobile communication switching device 2
Sends this call setup signal to the ISDN network 4,
The network 4 calls the telephone 5 (not shown). Here, telephone 5
Responds, the ISDN 4 transfers the call setting acceptance signal to the protocol converter 14 via the mobile communication switching device 2. The protocol conversion device 14 transfers the call setting acceptance signal to the ISDN 15. Since the ISDN network 15 has already sent the call setting acceptance signal to the base station controller 12, it does not send the call setting acceptance signal again.

Next, an authentication process is performed. The procedure and signal flow of an authentication request and authentication response signal between the mobile communication switching device 2 and the portable terminal 6 are the same as those in the case of location registration. Therefore, the description is omitted. Next, the call, response, and response confirmation signals after the authentication are transferred. Since these signals are defined in ISDN signals, the base station controller 12 and the protocol converter 14 receive the received signals. Can be transferred to the ISDN network 15 as it is.
Thus, the call from the mobile terminal 6 is completed.

(3) Incoming call FIG. 6 shows an operation example of an incoming call.
Is shown. When a call signal from the telephone 5 to the portable terminal 6 is sent to the ISDN 4, the ISDN 4 sends a call setting signal to the mobile communication switching device 2 (not shown). Upon receiving the call setting signal, the mobile communication switching device 2 sends the call setting signal to the protocol converter 14 corresponding to the position information of the portable terminal 6 recorded in the position information database 8. The protocol conversion device 14 transfers this call setting signal to the ISDN 15. Upon receiving the call setting signal, the ISDN network 15 sends a call setting acceptance signal to the protocol converter 14. However, at this time, it is unknown whether the mobile terminal 6 is responding.
The protocol conversion device 14 does not transfer the call setting acceptance signal to the mobile communication switching device 2.

On the other hand, the call setting signal sent to the ISDN 15 is received by the base station controller 12 and further transferred to the radio base station 11. The wireless base station 11 transmits an incoming call signal into the wireless zone 7. When the portable terminal 6 receives the incoming call signal, it transmits an incoming call response signal, and a wireless link is established between the wireless base station 11 and the portable terminal 6. Then, a call setting signal is transmitted from the wireless base station 11, and a call setting acceptance signal is transmitted from the mobile terminal 6. When the radio base station 11 receives the call setting acceptance signal, it sends a call setting acceptance signal to the base station controller 12. The base station controller 12 transfers the call setting acceptance signal to the ISDN 15.

However, even if the ISDN network 15 receives the call setting acceptance signal, the sequence stops here because the call setting acceptance signal has already been sent to the protocol converter 14. For this reason, the base station control device 12
When receiving the call setting acceptance signal from the network, it sends a normal call setting acceptance signal to the ISDN network 15 and converts the call setting acceptance signal into a data packet signal of the PVC line and sends it to the ISDN network 15. The ISDN network 15 transfers the packet data signal to the protocol converter 14. Upon receiving this packet data signal, the protocol conversion device 14 converts the packet data signal into the original call setting reception signal and transfers it to the mobile communication switching device 2.

Thus, the sequence up to the call setting acceptance signal for the call setting signal is completed. Next, an authentication process is performed. The procedure and signal flow of the authentication request and authentication response signals between the mobile communication switching device 2 and the mobile terminal 6 are the same as those in the case of location registration. Is omitted.

Next, the call, response, and response confirmation signals after the authentication are transferred. Since these signals are defined as ISDN signals, the base station controller 12 and the protocol converter 14 ISDN as received signal
The data can be transferred to the network 15. Note that the direction of the signal in this case is opposite to that of the outgoing call. Thus, the incoming call to the portable terminal 6 is completed.

FIG. 7 shows a second example of the radio communication system according to the present invention.
An embodiment will be described. In the figure, the features of this embodiment are as follows.
In place of the ISDN network 15 in the first embodiment, a satellite link via a portable satellite earth station 41, an earth station 42, and a satellite station 43 is used. However, an ISDN line similar to that of the first embodiment is set between the base station controller 12 and the protocol converter 14. In the configuration of the present embodiment, the delay time due to passing through a satellite line increases, but the other configuration is the same as that of the first embodiment. That is, similarly to the first embodiment, it is possible to perform location registration, outgoing call, and incoming call necessary for mobile communication.

By installing such a portable satellite earth station and using a satellite line, it is possible to easily expand the service range to remote islands and mountainous areas, and to use it as a communication means in the event of a disaster. Can be. In addition, between the portable satellite earth station 41 and the base station controller 12, and between the earth station 42 and the protocol converter 14, the IS
A DN network may be interposed.

[0030]

As described above, according to the present invention, since the radio base station and the mobile communication switching device can be connected via the ISDN network, the communication between the radio base station and the mobile communication switching device can be performed. Can be relaxed. Thus, a mobile communication service area can be set up in a spot without newly providing an expensive mobile communication switching device.

Further, a base station control device is provided between the radio base station and the ISDN network, and a protocol conversion device is provided between the mobile communication switching device and the ISDN network. Thus, the wireless base station and the mobile communication switching device can be connected via a normal ISDN network. Also, the interface of the radio base station to the base station control device can be equivalent to that of the conventional mobile communication switching device. The interface of the mobile communication switching device to the protocol conversion device can be equivalent to that of a conventional wireless base station. Therefore, conventional radio base stations and mobile communication switching devices can be used as they are.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a wireless communication system according to the present invention.

FIG. 2 is a block diagram showing a configuration example of a base station controller 12;

FIG. 3 is a block diagram showing a configuration example of a protocol conversion device 14;

FIG. 4 is a diagram showing a signal sequence of location registration.

FIG. 5 is a diagram showing a signal sequence of a call from a mobile terminal.

FIG. 6 is a diagram showing a signal sequence of an incoming call to a portable terminal.

FIG. 7 is a block diagram showing a second embodiment of the wireless communication system of the present invention.

FIG. 8 is a block diagram showing a configuration of a conventional wireless communication system.

[Explanation of symbols]

 1,11 wireless base station 2 mobile communication switching device 3,13,16 metallic line 4,15 ISDN network 5 telephone 6 mobile terminal 7 wireless zone 8 location information database 12 base station controller 14 protocol converter 21,32 I ' Interface unit 22, 31 I interface unit 23, 34 Signal control unit 33 Phase adjustment circuit 41 Portable satellite earth station 42 Earth station 43 Satellite station

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshio Yoshida, Inventor NTT Advanced Technology Co., Ltd. 1-3-1, Gotenyama, Musashino-shi, Tokyo (72) Inventor Takaaki Tanaka Musashino-shi, Tokyo 1-3-1 Gotenyama NTT Advanced Technology Co., Ltd. (72) Inventor Toshio Suzuki 1-3-1 Gotenyama Musashino-shi, Tokyo NTT Advanced Technology Co., Ltd. Inside

Claims (2)

[Claims] 1. A wireless communication system comprising: a wireless base station for mobile communication; and a mobile communication switching device for controlling location registration, outgoing call, and incoming call of a portable terminal in a wireless zone formed by the wireless base station. In the communication system, a base station control device, an ISDN network, and a protocol conversion device are arranged between the radio base station and the mobile communication switching device, and between the radio base station and the base station control device and the The protocol conversion device and the mobile communication switching device are connected via an interface dedicated to mobile communication conforming to the I interface, and are connected between the base station control device and the ISDN network and between the ISDN line and the Connected to the protocol converter via the I interface, the base station controller and the protocol converter,
Means for converting the interface dedicated to mobile communication and the I interface between each other, and packetizing control information not defined by the I interface to form the I
A wireless communication system comprising: means for transferring data to an SDN network; and means for converting the packetized data into original control information and transferring the converted control information to the wireless base station or the mobile communication switching device. . 2. A base station control device, an ISDN network, and a protocol conversion device are arranged between a radio base station and a mobile communication switching device. The conversion device and the switching device for mobile communication are connected via an interface dedicated to mobile communication conforming to the I interface, and are connected between the base station control device and the ISDN network and between the ISDN line and the protocol. In the remote control method of connecting to the conversion device via the I interface and controlling the radio base station from the mobile communication switching device, Among the control information to be transferred, control information that is not defined by the I-interface is transmitted between the base station controller and the protocol converter. As the data, the I
A remote control method, wherein data is transferred using a D channel of an SDN line.