JPH06237218A - Mobile radio communication system - Google Patents

Abstract

PURPOSE:To improve the utilization efficiency of a radio wave by registering machine kind of mobile stations 1-3 together with a subscriber's number in a subscriber table 14 of an exchange 15. CONSTITUTION:When calling is executed to stations 1-3, a base station 4 receives a call request signal from a station 15. From this signal, machine kind information of the stations 1-3 is extracted, and collated with a frequency band table 16 in order to retrieve a stand-by receiving frequency band. When there is an answer from the stations 1-3, the station 4 executed a trunk connection of this answer of the station 15, an exchange connection is executed by the station 15 and a communication is executed. When there is no answer, the station 4 transmits an unconnectability notice to the station 15. When a communication request is generated, the machine kind information of the station 1-3 is extracted by referring to a table 14. A controller 7 transmits the call request signal containing the machine kind information of the stations 1-3 to the station 4. The station 4 calls the stations 1-3, and in the case of being connectable, a calling mobile station side base station and a called party mobile station side base station 4 are subjected to exchange connection and a communication is executed. In such a way, the utilization efficiency of a radio wave is improved, and the subscriber capacity can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a mobile radio communication system in which a base station and a large number of mobile stations communicate with each other via radio lines. The present invention is a system developed for use in mobile radio communication in which a large number of users move together with mobile stations and a communication carrier forms part of a public communication network that provides communication and connection services for users. However, the method of the present invention can be applied to communication other than the public communication network.

[0002]

2. Description of the Related Art One or a plurality of base stations are arranged in a service area, and a large number of mobile stations connectable to the base stations by radio lines move in the service area. A mobile telephone system for public communication is widely used as a system for connecting to a base station.

In such a mobile radio communication system, one frequency band (AMHz band) is allocated.
As the number of users increases, another frequency band to be used (BMHz band) will be allocated. In urban areas where there are many users, base station equipment is installed in the BMHz band in addition to the AMHz band equipment, or another base station for the BMHz band is installed in the same service area. On the other hand, although a mobile station device for the BMHz band is provided to a newly subscribed user, at this time, not only the mobile station device that can be used only in the BMHz band but also the AM in the BMHz band is used.
A mobile station device that can be used in the Hz band may be provided. That is, multiple frequency band mobile stations are present in one service area.

A conventional example will be described with reference to FIG. FIG. 6 is a block diagram of a conventional example. The mobile station 1 is an AMHz band dedicated device, the mobile station 2 is an A or B MHz band switching device, and the mobile station 3 is a B MHz band dedicated device. The base station 4 includes a transceiver 5 in the AMHz band and a transceiver 6 in the BMHz band to support both the A and B MHz frequency bands. Zones 12 and 13 are effective radio wave coverage areas formed by the control channel 10 in the AMHz band and the control channel 11 in the BMHz band, respectively.

When a call is made to the mobile station 1, the mobile station 1 may be present in the base station 4 from the exchange 15.
A call request signal is transmitted to. Since the switching center 15 and / or the base station 4 do not have information as to whether the called mobile station 1 is receiving the AMHz band or the BMHz band, the base station 4 has both the control channels 10 and 11. To send a call signal.

[0006]

Under such circumstances, when a call is made to one mobile station from the base station side, it is unclear in which frequency band the mobile station is on standby reception. is there. Strictly speaking, which frequency band of the control channel is being received is unknown on the base station side. Therefore, when a call is made from the base station side to one mobile station, the calls are simultaneously made in parallel on the control channels of two frequency bands.

This is because the paging signal is transmitted even at a frequency that the mobile station is not receiving, and it is useless in terms of radio wave utilization efficiency.

The present invention aims to improve this and to improve the utilization efficiency of radio waves.

[0009]

The present invention comprises one or a plurality of base stations, a large number of mobile stations connectable to the base stations via radio lines, and a control device for controlling the base stations. It is a mobile wireless communication system.

Here, a feature of the present invention is that a plurality of frequency bands are set in the wireless line, and a plurality of frequency bands available in two or more of the plurality of frequency bands in the plurality of mobile stations. There is a band mobile station, and the control device has a storage unit in which a frequency band used for each mobile station is registered in advance, and a storage unit of the storage unit when calling from one of the mobile stations from the base station side. According to the registered contents, control is performed so that mobile stations that use one frequency band can call in one frequency band and mobile stations that use two or more frequency bands can use two or more available frequency bands. And means for doing so.

[0011]

The model information of the mobile station is registered together with the subscriber number in the subscriber table of the control device in the exchange.

When a call is made to this mobile station, a call is made in the standby reception frequency band by referring to the registered model information. At this time, if the model is a model that can use a plurality of frequency bands, the call is performed using the control channels of all of the plurality of frequency bands.

As a result, radio waves in a frequency band irrelevant to the corresponding mobile station are less likely to be emitted unnecessarily, and the radio waves can be effectively used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of an embodiment of the present invention.

The present invention is a mobile radio communication provided with a base station 4, three mobile stations 1 to 3 connectable to the base station 4 via a radio line, and a control device 7 for controlling the base station 4. It is a method.

Here, the feature of the present invention is that two frequency bands, AMHz band and BMHz band, are set in the wireless line, and these two frequency bands are set in the three mobile stations 1 to 3. There is a mobile station 2 as a multiple frequency band mobile station that can be used in the control device 7, and the control device 7 has a subscriber table 14 and a base station 4 as storage means in which the frequency bands used for each mobile station 1 to 3 are registered in advance. Mobile stations 1-3 from the side
When making a call to the mobile station 1 according to the registered contents of the subscriber table 14, the mobile stations 1 and 3 having one frequency band are assigned to the one mobile station 2 and the mobile station 2 having two frequency bands are used. And means for controlling the call to be executed in the second available frequency band.

The operation of the embodiment of the present invention will be described below with reference to FIGS. FIG. 2 is a flowchart showing the operation of the base station 4. FIG. 3 is a flowchart showing the operation of the control device 7. FIG. 4 is a diagram showing the subscriber table 14. FIG. 5 is a diagram showing the frequency band table 16. As shown in FIG. 2, the base station 4 receives the position registration information from the mobile stations 1 to 3 (S1) and transfers it to the exchange 15 (S2). When the base station 4 is started and when there is no communication request from any of them, this operation is repeated to prepare for the generation of a communication request.

When there is a call from the mobile stations 1 to 3 (S
3) The base station 4 relays the call to the exchange 15 (S4). Exchange connection is performed and communication is performed at the exchange 15 (S5). When communication ends, the line is released (S
6).

When the mobile stations 1 to 3 receive an incoming call (S3), the base station 4 receives a call request signal from the exchange 15 (S).
7). The model information of the called mobile stations 1 to 3 is extracted from the call request signal and collated with the frequency band table 16 to search the standby reception frequency band (S8). If it is an incoming call to the mobile station 1, the frequency band is called in the AMHz band (S10), and if it is an incoming call to the mobile station 3, the frequency band is called in the BMHz band (S11). If the call is to the mobile station 2, the call is made in both the AMHz band and the BMHz band (S12).

If there is a response from the mobile stations 1 to 3 to this call (S13), the base station 4 relays the response to the exchange 15 (S4), and the exchange 15 establishes the exchange connection. Communication is performed (S5). When the communication is completed, the line is released (S6).

If there is no response from the mobile stations 1 to 3 to the call (S13), the base station 4 sends a disconnection notification to the exchange 15 (S14).

As shown in FIG. 3, the control device 7 of the exchange 15 receives the location registration information regarding the mobile stations 1 to 3 from the base station 4 (S21). Information on the subscriber number, the location number, and the base station number is extracted from the location registration information and registered in the subscriber table 14 (S22). When the control device 7 is started and when there is no communication request from any of them, this operation is repeated to prepare for the generation of a communication request.

When a communication request is made (S23), the subscriber table 14 is referred to and the called mobile stations 1 to
The model information of No. 3 is extracted (S24). The control device 7 transmits a call request signal including model information of the called mobile stations 1 to 3 to the base station 4 (S25). The base station 4 calls the called mobile stations 1 to 3 by the procedure shown in FIG. 2, and if connection is possible (S2
6) The calling mobile station side base station and the called party mobile station side base station 4 are exchange-connected (S27) and communication is performed (S28). When the communication is completed, the line is released (S29). If the connection is not possible (S26), a notification of connection failure is sent to the calling mobile station side base station (S30).

As shown in FIG. 4, the subscriber table 14 is composed of registration areas for subscriber numbers, mobile station models, position numbers, and base station numbers. The subscriber number 111 is the mobile station 1, the subscriber number 222 is the mobile station 2, and the subscriber number 333.
Indicate mobile stations 3, respectively.

As shown in FIG. 5, the frequency band table 16
Consists of the mobile station model and the registration area of the frequency band to be called.

[0026]

As described above, according to the present invention, the utilization efficiency of radio waves can be improved. Therefore, the subscriber capacity can be increased.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing the operation of the base station.

FIG. 3 is a flowchart showing the operation of the control device.

FIG. 4 is a diagram showing a subscriber table.

FIG. 5 is a diagram showing a frequency band table.

FIG. 6 is a configuration diagram of a conventional example.

[Explanation of symbols]

 1 to 3 mobile station 4 base station 5 AMHz band transceiver 6 BMHz band transceiver 7 controller 8 antenna 9 control line 10, 11 control channel 12, 13 zone 14 subscriber table 15 exchange station 16 frequency band table

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Morito Katsuta 2-10-1, Toranomon, Minato-ku, Tokyo NTT Mobile Communication Network Co., Ltd.

Claims (1)

[Claims] 1. A mobile radio communication system comprising one or a plurality of base stations, a plurality of mobile stations connectable to the base stations via radio lines, and a control device for controlling the base stations, A plurality of frequency bands are set in the wireless line, and there are multiple frequency band mobile stations that can be used in two or more of the plurality of frequency bands among the plurality of mobile stations, and the control device When a call is made from the base station side to one of the mobile stations, the mobile station whose use frequency band is 1 corresponds to the storage means in which the use frequency band is registered in advance. A mobile radio communication system, characterized in that a mobile station having one frequency band and using two or more frequency bands is provided with means for controlling to execute a call in the two or more available frequency bands.