JPH06237216A - Mobile radio communication system - Google Patents

Abstract

PURPOSE:To improve the radio wave utilization efficiency by recording receiving frequency band information of a mobile station in a subscriber table of an exchange. CONSTITUTION:Two bands of an AMHZ band and a BMHZ band are set to a radio circuit, and when a mobile station 2 can utilize both these frequency bands, a controller 7 is provided with a means for registering information related to a frequency utilized for its call at every mobile station 1-3 by allowing it to correspond to the registered contents of a subscriber 14, and a means for controlling the call by its frequency. When calling comes to the stations 1-3, a call is executed by the AMHZ band or the BMHZ band. When there is an answer from the stations 1-3 with respect to the call, a base station 4 is subjected to trunk connection to an exchange 15, an exchange connection is executed, and a communication is finished, the circuit is released. Unless there is an answer from the stations 1-3, the station 4 transmits an unconnectable communication to the station 15. The device 7 receives position registering information related to the stations 1-3 from the station 4, and registered it in the table 14. In such a way, the utilization efficiency of radio wave can be 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 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 within the service area. The method of connecting with a mobile phone method for public communication is widely used. In this method, the plurality of base stations are controlled by a control device, and the base station to which the mobile station is to be connected is registered for each mobile station in the control device. Will be updated. When the mobile station is called from the base station side, the call is executed from the registered base station.

By the way, in such a mobile radio communication system, one frequency band (AMHz) is allocated, but as the number of users increases, another one (BMHz) is further allocated.
The frequency band used 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, 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 BMHz band or the AMHz band can be used. A mobile station device 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. 5 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 a circumstance, when a call is made from a base station to one mobile station, if the mobile station is a mobile station having a plurality of frequency bands, which frequency band is used. Whether or not the control channel of which frequency band is being received is strictly unknown on the base station side. Furthermore, when two frequency bands are used in the same service area or in a service area that overlaps with each other in a complicated manner, it becomes unclear on the base station side to which frequency band a mobile station in the service area belongs. 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 a plurality of base stations, a large number of mobile stations connectable to the base stations via radio lines, and a controller for controlling the plurality of base stations. The control device includes storage means for registering, for each mobile station, a base station to which the mobile station should connect, means for updating the registered contents of the storage means as the mobile station moves, And a means for controlling a call from a station to a mobile station to be executed from a base station registered in the storage means.

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. When there is a band mobile station, the control device registers, for each mobile station, information relating to the frequency used for calling the mobile station in association with the registered content of the storage means, and the frequency relating to the frequency. And means for controlling to make a call at that frequency based on the information.

The means for extracting the information regarding the frequency preferably includes means for extracting from the transmission signal of the mobile station.

[0012]

The position registration information of the mobile station and the information of the frequency band received by the mobile station are also registered in the subscriber table of the control device in the exchange. This is to register the frequency band information from the judgment that the frequency band used when the mobile station transmitted the position registration information is also the reception frequency band.

When calling the mobile station, the registered frequency band information is referred to and the mobile station is called.

As a result, radio waves in a frequency band irrelevant to the corresponding mobile station are not wastefully radiated, and radio waves can be effectively used. Also, since the mobile station extracts and registers frequency band information from the frequency band in which the location registration information is transmitted,
It simplifies the registration procedure before using the mobile station.

[0015]

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 comprises a base station 4, three mobile stations 1 to 3 connectable to the base station 4 via a wireless line, and a control device 7 for controlling the base station 4. 7, a subscriber table 1 as a storage means for registering the base station 4 to which each of the mobile stations 1 to 3 should be connected.
4 and means for updating the registered contents of the subscriber table 14 as the mobile stations 1 to 3 move, and the mobile stations 1 to 3.
And a means for controlling the base station 4 registered in the subscriber table 14 to execute a call to the mobile radio communication system.

Here, the feature of the present invention is that two types of frequency bands, AMHz band and BMHz band, are set in the wireless line, and these two types are provided in the three mobile stations 1 to 3. When there is a mobile station 2 having two frequency bands that can be used in both the AMHz band and the BMHz band, the control device 7 uses the mobile stations 1 to 3 for calling the mobile stations 1 to 3. It is provided with a means for registering information on a frequency in association with the registered contents of the subscriber table 14 and a means for controlling the call to be executed on the frequency based on the information on the frequency.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS. 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. As shown in FIG. 2, the base station 4 receives the position registration information from the mobile stations 1 to 3 (S1) and detects the transmission frequency band (S2). The position registration information is transmitted to the exchange 15 together with the information of this frequency band (S3). 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
4), the base station 4 relays the call to the exchange 15 (S5). Exchange connection is established at the exchange station 15 for communication (S6). When communication ends, the line is released (S
7).

When the mobile stations 1 to 3 receive an incoming call (S4), the base station 4 receives a call request signal from the switching center 15 (S).
8). The frequency band information of the called mobile stations 1 to 3 is extracted from this call request signal (S9). If the call is to the mobile station 1, the call is made in the AMHz band as the frequency band (S
11), if the call is for the mobile station 3, the frequency band is B
A call is made in the MHz band (S12). If the mobile station 2 is an incoming call, the mobile station 2 sends the location registration information to the base station 4
The call is made in the frequency band when it was sent to. Here, the mobile station 2 will be described as transmitting and receiving in the AMHz band.

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 (S5), and the exchange 15 performs the exchange connection. Communication is performed (S6). When the communication is completed, the line is released (S7).

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 position registration information regarding the mobile stations 1 to 3 from the base station 4 (S21). Information on the subscriber number, the position number, the frequency band, and the base station number is extracted from the position registration information and registered in the subscriber table 14 (S2).
2). 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 generated (S23), the subscriber table 14 is referred to and the called mobile stations 1 to
The frequency band information of No. 3 is extracted (S24). The control device 7 transmits a call request signal including frequency band 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 in the procedure shown in FIG. 2, and if connection is possible (S26), the calling mobile station side base station and the called party mobile station side base station 4 are switched and connected. (S27) and communication is performed (S2)
8). 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, position numbers, frequency bands, and base station numbers. The subscriber number 111 indicates the mobile station 1, the subscriber number 222 indicates the mobile station 2, and the subscriber number 333 indicates the mobile station 3.

[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.

Since the switching center recognizes and registers the frequency band used by the mobile station based on the transmission frequency band of the location registration information from the mobile station, the registration procedure before using the mobile station can be omitted.

[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 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

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

Claims (2)

[Claims] 1. A plurality of base stations, a plurality of mobile stations connectable to the base stations via a wireless line, and a control device for controlling the plurality of base stations. Storage means for registering a base station to which the mobile station should connect for each station, means for updating the registered contents of this storage means as the mobile station moves, and a call from the base station to the mobile station In a mobile radio communication system comprising means for controlling execution from a base station registered in storage means, a plurality of frequency bands are set in the radio line, and the plurality of frequency bands are set in the plurality of mobile stations. When there is a plurality of frequency band mobile stations that can be used in two or more of the above frequency bands, the control device associates, for each mobile station, information regarding the frequency used for calling the mobile station with the registered content of the storage means. And means to register And a means for controlling the call to be executed on the frequency based on the information on the frequency. 2. The mobile radio communication system according to claim 1, wherein the means for extracting the information about the frequency includes means for extracting from the transmission signal of the mobile station.