JPH0363258B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication channel utilization technique for integrating mobile radio systems such as automobile telephones, mobile telephones, and cordless telephones.

[Conventional technology]

Conventionally, each of the three types of systems has been operated independently, which has the disadvantage of causing so-called frequency division loss and dead zones for each system.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a mobile radio communication system that eliminates the above-mentioned disadvantages of the prior art, eliminates the frequency division loss, and mutually compensates for dead areas, resulting in fewer disconnections.

[Means for solving problems]

The present invention has at least one connection control channel for a car or a mobile phone that uses adjacent frequency bands, and at least one connection channel for a cordless phone, and at least one communication path for a car or a mobile phone that uses adjacent frequency bands. , at least one telephone communication channel for cordless telephones, each mobile object such as an automobile, a mobile phone, or a cordless telephone, which is equipped with a total of four types of communication channels and can be tuned to the four types, and a land-based wired switching network connected through the communication channels. , and an exchange or connection device that performs connection control to realize the system functions.

The present invention integrates an automobile or a mobile phone system and a cordless telephone system, which were conventionally operated as separate systems, and mutually reuses communication channels, thereby dividing the system into separate systems.
By eliminating the so-called frequency division loss and by taking advantage of the fact that the target service area mutually compensates for dead areas, it can economically eliminate the entire dead area and improve call quality and connection rate. It is characterized by

〔Example〕

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

FIG. 1 is a concrete configuration diagram showing the entire system of an embodiment of the present invention.

In FIG. 1, a car phone 1, a mobile phone 2,
For cordless telephones 3 located outdoors,
It is directly coupled to the base station 4 by radio waves. A cordless telephone 13 located in a building 9 on the ground is connected to a cordless telephone master station 5 by indoor-to-room radio waves. This master station 5 is connected to an exchange 6 located outside the building 9 by a subscriber line 7, and this exchange 6 is connected to an automobile or mobile telephone exchange 14 via an inter-office trunk line 8. and this exchange 1
4 is connected to the base station 4 via a transmission path 20.

Furthermore, other mobile phones 12 and other car phones 11 that have entered the dead area 10 such as an underground parking lot are transferred to another cordless telephone master station 5 provided within the parking lot.
This master station 5 is connected to the switching center 6 by another subscriber line 7.

The exchange 6 is connected to the public communications switching network via an interoffice trunk line 19.

FIG. 2 is a frequency allocation diagram of the system according to the embodiment of the present invention. A first connection control communication path 15 for a car phone or a mobile phone or a common use for both, a second connection control communication path 16 for a cordless phone, a first call communication path 17 for a car phone or a mobile phone or a common use for both, and a cordless phone. The second communication channels 18 for telephones are arranged as shown in the figure. This indicates that these are placed in adjacent frequency bands so that they can be switched and shared.

Here, the exchange 6 is provided with a subscriber file memory for registering the location of each mobile phone.
The subscriber line number of each mobile phone or location information indicating the area in which each mobile phone exists is registered in this subscriber file memory, and connection control such as incoming calls is performed based on this location registration. In addition, the subscriber file memory of this exchange 6 also contains data indicating whether the mobile phone or cordless phone has selected the first communication path for the car phone or mobile phone or the second communication path for the cordless phone, as will be described later. The selected communication path is also registered.

The configuration of the base station and master station here is that of a conventional base station for a car phone or mobile phone, or a master station for a cordless phone, and is connected to each mobile phone via a wireless line under control from the switching center. . Regarding the configuration of such a base station or master station, see, for example, Ito, Matsuzaka, "Overview of Car Telephone System," Research and Practical Application Report, Vol. 26, No. 7 (1977), P.1821-1836 Z.
C.Fluhr, PTPorter “Control Architecture”
Bell System Technical Journal, Vol.58, No.
1, Jan. 1979, P. 43-63. In addition, the configuration of the switching center 6 is the same as that of the conventional mobile phone system switching center, but the mobile body selects and uses two communication paths: the mobile phone system communication path and the cordless phone communication path. Therefore, regarding the subscriber file memory, the mobile phone registers its location through one of two communication channels, a car phone or a cordless phone, and information to identify which of these two communication channels to connect to. A configuration is added in which the information is stored.

Next, the operation of the method of this embodiment will be explained.

The service area of the base station 4 in FIG. 1 is mainly outdoors, and connection with the car phone 11 and the mobile phone 12 cannot be made as is in a dead area 10 such as an underground parking lot. Furthermore, the cordless telephone 13 is mainly permanently installed in the building 9, and the service area of the master station 5 is limited to the inside of the building 9 and the vicinity of the building 9 due to electromagnetic field leakage from the building. becomes disconnected.

In the present invention, as shown in FIG. 2, all communication paths can be shared by each mobile body, so that when the mobile phone 11 enters the dead area 10 such as an underground parking lot, the mobile phone 11 is connected to the base station 4.
When the electric field in the car phone connection control communication channel 15 becomes weaker and falls below a certain limit value, scanning starts automatically. Then, upon receiving a strong electric field from the cordless telephone connection control channel 16, it stops scanning and returns its own identification number via a communication channel in the opposite direction to the cordless telephone connection control channel 16.
This returned signal is sent to the exchange 6 via the master station 5 in the underground parking lot and the subscriber line 7, and the exchange 6 sends the subscriber line to the exchange 14 to which the car telephone 11 is registered. Send the number and identification number. As a result, the subscriber line number indicating the current location is registered in the subscriber file memory (not shown) related to the above-mentioned car telephone 11.

Incoming calls to the car phone 11 are first sent to the exchange 1.
An incoming signal is received at 4, and is transferred to the dead area 10, which is the current location, via the interoffice trunk line 8, the exchange 6, and the master station 5, using the subscriber line number indicating the current location in the subscriber file memory. Connect. A call is also made from the car telephone 11 to the interoffice trunk line 19 via the master station 5, the trunk line 7, and the exchange 6, and the billing information is sent to the exchange 14 for billing.

In both cases of incoming and outgoing calls, when connecting via a connection control channel and proceeding to a call, the general rule is to move to a call channel belonging to a frequency band with a stronger electric field on the connection control channel. This is done after moving to the cordless telephone communication channel 18. However, it is not necessary that the communication path for the car phone or mobile phone and the communication path for the cordless phone be dedicated to each other, and the communication paths may be mutually accommodated as necessary or with constant attention to mutual interference. It is also possible to eliminate split losses. This is exactly the same for the mobile phone 12 as for the car phone 11.

In the above description, it is preferable to appropriately increase or decrease the transmission output within the respective service areas of the car phone, mobile phone, and cordless phone in order to reduce interference.

Next, as a reverse example, a case will be described in which the cordless telephone 13, which is permanently installed inside the building 9, is taken outside.

Since it is outside the service area of the master station 5 in the building 9, the electric field of the cordless telephone connection control channel 16 becomes weak. When the electric field falls below a certain limit value, it automatically starts scanning, receives the connection control channel 15 for a car or mobile phone with the strongest electric field, and stops, and sends its own identification number to the connection control channel 15 for the car or mobile phone. A return path in the opposite direction of the communication path 15 connects the base station 4, the mobile telephone exchange, and the inter-base station transmission path 2.
0, the switching center 14, and the interoffice trunk line 8 to register the current location information indicating the area where the mobile body currently exists in the switching center 6's own subscriber file memory. Transfer of incoming calls based on registered current location information and billing for outgoing calls are completely the same as in the previous car.

Implementation of the present invention having the above operations and functions can be realized by designing the program of the electronic exchange group and the control unit of each mobile unit, and the hardware and software of the control unit of each mobile unit, which is large in number, can be unified. This has the advantage of being possible, and there are few factors that will increase costs.

〔Effect of the invention〕

By applying the present invention, the frequency can be shared and division loss can be eliminated. It is possible to provide a mobile radio communication system that has the effect of saving frequency resources, is economical in land-side radio equipment, has a high connection rate, has fewer dead areas, and has high call quality. Generally, there are many problems in eliminating dead zones within the service area of a base station, which poses many problems not only from an economical perspective but also from a practical standpoint, but it is clear that this can be solved economically and effectively by applying the present invention. , which is particularly advantageous for the (mobile) radio communication system according to the invention.

[Brief explanation of drawings]

FIG. 1 is a concrete configuration diagram showing the entire structure of an embodiment of the present invention. FIG. 2 is a schematic diagram showing frequency allocation of a communication channel according to the present invention. 1, 11...Car phone, 2,12...Mobile phone, 3, 13...Cordless phone, 4...Base station for car or mobile phone, 5...Cordless phone main station, 6...Switching center, 7 ...Subscriber line (or trunk line), 8..Interoffice trunk line, 9..Building, 10..
...Car telephone service dead area, 14...Car or mobile phone exchange, 15...Connection control communication path for car or mobile phone, 16...Connection control communication path for cordless telephone, 17...Car and mobile phone call Communication path, 18... Speech communication path for cordless telephone, 19... Interoffice relay line, 20... Transmission line between switching center for car telephone or mobile phone and base station.

Claims (1)

[Scope of Claims] 1. In a wireless communication system that uses a plurality of communication paths separately for connection control and for calls, and targets mobile phones such as car phones, mobile phones, and cordless phones, A first connection control communication path for a mobile phone or for both, a second connection control communication path for a cordless phone, a first communication path for a car phone or a mobile phone, or a communication path for both, and a cordless phone. and a second communication channel for communication are arranged in a frequency band close to each other, and each of the above-mentioned mobile objects is equipped with a means for switching between the above-mentioned communication channels to control connection and make calls, regardless of the type thereof, and has an antenna outdoors. A base station for telephones or mobile phones and a master station for cordless telephones having an indoor antenna are connected via a wired communication network to a switching center equipped with a subscriber file memory. When connecting via the first connection standby communication path and the first call communication path, the identification number of this mobile object and location information indicating the current position of this mobile object are registered, and the mobile object is connected to the second connection standby communication path. When connecting via a communication path and a second call communication path, the identification number of this mobile object and the subscriber line number are registered in place of the above location information of this mobile object, and the above-mentioned car phone or mobile phone base station The cordless telephone master station is equipped with a means for controlling the connection on the first connection standby communication channel based on the location information registered in the subscriber file memory, A means for controlling the connection on the second connection standby communication channel is provided, and each of the moving objects has a means for scanning the first and second connection control communication channels to control the input electric field in order to perform incoming call standby and making calls. The switching center is equipped with a scanning means for detecting a strong communication channel, and a means for returning its own identification number to the exchange for location registration on the communication channel with a strong input electric field detected by the scanning means. . A wireless communication system characterized by comprising means for registering the location of the mobile body in the subscriber file memory based on the identification number returned from the mobile body. 2. The mobile body is equipped with means for switching transmission output, and the strength of the transmission output is configured to be switchable according to the area in which the mobile body is currently located among the respective service areas of a car phone, a mobile phone, or a cordless phone. The wireless communication system according to claim 1, characterized in that: