JPH0759107B2 - Closed mobile wireless telephone system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mobile radio telephone system, and more specifically,
The present invention relates to a closed mobile radio telephone system (hereinafter abbreviated as closed system) used in closed areas such as buildings and factories, and in particular, any mobile telephone that has entered the closed system can be used as a general public line through a wireless line in a wide area. A closed area designed to enable mutual call with a telephone connected to a general public line via a wide area mobile radiotelephone system (hereinafter abbreviated as wide area system) that executes mutual callable services between Mobile radio telephone system.

[Conventional technology]

Mutual telephone communication in a wide area system is conventionally performed as a cellular (“cellular”) public mobile telephone system, for example, a telephone system that connects an automobile to a general telephone subscriber and to each other as in the case of an automobile wireless telephone. As already the service is running. However, when the mobile phone is brought into a building, there is a problem that the communication quality is deteriorated due to the radio interference due to the building structure. In addition, mobile phones that can enjoy services are limited to subscriber telephones within the wide area service area, that is, telephones that have a telephone number registered in advance and have a contract to pay the telephone charge. There is a problem that mobile phones of closed subscribers other than the subscribers cannot receive the service even if they enter the wide area service area. In addition, as a mobile telephone system for solving the above-mentioned call trouble, "universal mobile wireless communication (Universal Portable R
The document entitled "adio Communications)" is IEEE Transaction
s), VT-34, No. 3, pages 117-121, published in 1985.

[Problems to be solved by the invention]

The universal mobile telephone system of the above document is a small base station with a fixed low output power of about 5 mW, which is divided into a wide area indoor and outdoor into small areas where the distance between adjacent antennas is 2000 feet. We are trying to solve the radio interference indoors by installing an antenna with a height of about 30 feet in and, but because it is a method to install many small base stations outdoors, until the number of subscribers increases Has a problem that the system construction cost becomes expensive and a wide area system different from the existing cellular mobile telephone system must be newly constructed.

One of the inventors of the present application first proposed (Japanese Patent Application No. 60-27674).
9 (JP-A-62-136930)), in the mobile radio telephone system, a mobile telephone in the closed area and a telephone exchange of a wired line in the closed area are connected by a radio line, and a frequency channel for transmitting and receiving the radio line is connected. As a part of the wide-area radio frequency channel that is being serviced in that area, and its radio field strength is weak enough not to disturb the wide-area system and other adjacent closed systems. Enables the mutual call to the general public telephone line through the wide area system without giving or receiving the radio interference to other people, but in that case, the mobile phone becomes a closed system subscriber. However, the problem remains that if the subscriber is not a closed system subscriber, he / she cannot connect to the general public line via the closed system and wide area system.

An object of the present invention is to provide a mobile telephone of a cellular mobile radio telephone,
An object of the present invention is to provide a closed mobile radiotelephone system that enables mutual connection with general public lines via the closed system even if the subscriber is not a closed system subscriber.

[Means for solving problems]

In the closed system installed in the area of the wide area system where the cellular public mobile radio telephone service is implemented, one of a plurality of frequency channel bands used in the wide area system is used in the closed system. To communicate with the mobile phone, set a unique special registration number for each location, which is separate from the subscriber's telephone number, at each of the multiple locations in the closed system, and display this in advance. By having the owner of the mobile phone who is not a closed system subscriber register the location using the special number for registration, the exchange in the closed system receives this via the wireless line, and the special number is used to close the system. Recognizing that he / she is not a subscriber, this special number is registered in a wide area exchange, and the wide area exchange has registered a special number. display It acknowledged that made the by a method for connecting the mobile telephone to the public telephone is achieved.

That is, the present invention has a function that should be called a cordless version of a red telephone (a public telephone to which a call line is connected by paying a fee) installed in a building premises, etc. If the telephone is not a subscriber of the closed system, by knowing the special number for registration displayed in its vicinity and transmitting this, the closed exchange receives the position registration via the wireless line. . After receiving the location registration, the closed exchange recognizes that it is not a closed subscriber from the special number and registers the location in the wide area exchange.
From the location-registered special number, the wide area switching center recognizes that the mobile phone is not a subscriber who has a service contract, but because it used the special number, there was an indication of intention to bear the charge, and Connect to a general line network via a wired line. As a result, even if the mobile phone entering the closed area is not a subscriber, if the location registration is performed using the special numbers for registration displayed at various places within the closed area, like the subscriber phone within the closed area, Mutual (sending and receiving) calls can be made between the telephones connected to the general line network via the closed exchanges and the wide area exchanges during the period when the location registration is maintained.

[Action]

If the mobile telephone is a closed-system subscriber, by registering the location with the subscriber number, the mobile telephone can be connected to the cellular mobile radio telephone system and can communicate with a telephone of the general line network. However, if the mobile telephone is not a closed-system subscriber, the call charge bearer becomes a problem, and the above connection cannot be performed immediately.

This problem is caused by the owner of the mobile phone sending out special numbers for registration that are scattered and displayed in various places in the closed system, and registered in the cellular mobile radio telephone system via the exchanges in the closed system. This is solved by displaying the intention to bear the call charge, and while the special number is stored in the memory in the wide area switching center, it can be treated in the same manner as the subscriber's telephone. In this case, the owner of the closed system can also receive a part of the call charge as a consideration for the service.

The closed system adopts the same method as that used in the cellular mobile radio telephone system as much as possible, whereby the function newly added to the mobile telephone can be minimized. The special number for registration is transmitted from the mobile telephone by operating a manual button or the like, but it is desirable that the special number for registration is restored at the end of the call by an automatic restoration method.

Incoming and outgoing calls of mobile phones that are not subscribers of the closed system are normally recorded in the exchange of the wide area system, and the call charges are paid to the wide area system and the closed system according to the arrangement of the wide area system and the closed system.

The above method is intended for a mobile telephone that is not a closed-system subscriber to perform both outgoing and incoming passages within the closed area. However, considering that the majority of red telephone services are call originators, limiting the aisle service within the closed area to only call origination makes it necessary for mobile phones that are not closed area subscribers to only register the closed area location. , Location registration to wide area system becomes unnecessary.

At this time, how to pay the call charge becomes a problem. One way is for the owner of the mobile phone to call the phone card (NT
Prepaid information such as T company sales) is built into the mobile phone, and this information is paid by the closed exchanges processing through the wireless line. Another method is that the owner of the mobile phone transmits the ID (personal identification) information and the credit number (personal credit information) to the closed exchange through the closed radio line and pays it separately at a later request. is there.
The former has the advantage that the privacy of the caller is maintained, and the latter has the advantage that no charges have to be paid in advance. It goes without saying that both can be applied to the case where the location is registered in the wide area switching center and the arrival and departure service is received.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing a closed and wide area telephone line connection system according to this embodiment, and FIG. 2 is an NTT of cellular automatic telephone systems already provided in Japan.
It is a connection diagram in which the present invention is applied to a (Nippon Telegraph and Telephone Corporation) system. First, in FIG. 2, 1 indicates a wide area mobile radio telephone system, that is, a wide area system, 2 indicates a closed area mobile radio telephone system, that is, a closed area system installed in the service area, and 3 is shared by both parties. A possible mobile radio telephone (hereinafter abbreviated as mobile telephone) is shown. The closed system 2 also adopts a small radius cellular system, and a part of the radio frequency channel used in the car telephone system is double reused with a small electric power. In the figure, 10 surrounded by a dot-dash line indicates the station rank in the long-distance band system of Japan's long-distance telephone network, and EO is the lowest telephone handling station that accommodates the subscriber telephone SUB. ),
TC establishes the central station (Toll Center), which is the center of the area when establishing a central station area in a regional gathering of DCs, DC
R is the Central Center (District Center) that serves as the center of the area when setting the central office area in a regional gathering of centralized area.
C is the general bureau (R
egional Center), respectively.

In Fig. 2, 4 is a closed base station (CP), 5 is a closed mobile exchange (MPBX), 6 is a mobile telephone exchange (AMC), 9 is a wide area mobile telephone base station (MCS), and MBS is Each car base station is shown. These functions and operations will be described with reference to FIG.

FIG. 1 shows a telephone line connection method for the closed system 2 and the wide area system 1 according to this embodiment. The mobile telephone 3 and the closed base station 4 are connected by a wireless line, and the closed base station 4 is connected to the wide area system 1 and the general public network via a closed mobile exchange 5 and a car telephone exchange 6 by a wired line. . The line connection between the closed mobile exchange 5 and the car telephone exchange 6 is controlled by a touch-tone transmitter 7 and a touch-tone receiver 8. C-CH is a control channel for performing data communication until the mobile telephone 3 and the closed base station 4 start a call, and the signal format of the control channel is to minimize the functions required to be added to the mobile telephone 3. Therefore, it is desirable to adopt the signal format adopted in the wide area system 1. That is, FIG. 3 shows the signal types and formats of the communication channel (radio section) S / CH and the control channel C / CH used in the cellular NTT system, which is also adopted in the closed base station 4 of this embodiment as it is. It shall be. There are two control channels C and CH, an outgoing control channel P and CH and an incoming control channel A and CH, which perform data communication in the wireless section until the start of a call. Even during a call, in the call channel S / CH, data communication such as a call channel busy switching command is performed at a speed of 300 bits / second. The closed base station 4 and the closed mobile exchange 5 are connected by the data link D.LK of FIG. Regarding the line control signal in Fig. 3, Research Institute for Practical Use, Research Report, No. 31
Volume, No. 1, p. 35.

The location registration from the mobile telephone 3 to the closed area system 2 is performed in the same manner as the location registration to the wide area system 1. Mobile phone 3 is closed system 2
When entering the service area, the switches of the mobile phone 3 are manually switched to the closed mode. The origination control channel P.CH of the closed base station 4 always sends a position registration request notification signal, and decodes this code to manually switch to a responsive state.

FIG. 4 shows a procedure for location registration from the mobile telephone 3 to the closed mobile exchange 5 and the car telephone exchange 6 via the closed base station 4. When the mobile telephone 3 is switched to the closed mode, it is switched to the transmission control channel P.CH which is constantly transmitted from the closed base station 4 and the position information is collated.
If no match is found, the incoming control channels A and CH are switched to request the location registration from the closed mobile exchange 5. In the closed mobile switching center 5, the received signal is collated, and if it can be collated with the old location information, the location registration acceptance is answered to the mobile telephone 3 via the incoming control channel A / CH. After receiving this signal, the mobile phone 3 updates the old position information with the new position information.

FIG. 5 shows a procedure for location registration from the mobile telephone 3 to the wide area system 1 via the closed system 2. If the mobile telephone 3 is a subscriber of the closed system 2, the service similar to that of the closed wired extension telephone can be received because the subscriber telephone number is already recorded. In other words, an outside line can be dialed by dialing a partner number prefixed with "0" to make a call to a general public line at a lower call charge than a cellular mobile phone. In addition, an external line incoming call can be received via the telephone switch of the closed mobile exchange 5 by regarding the mobile telephone 3 as if it were an extension wired telephone.

When the mobile switching system 3 is not a subscriber of the closed system 2, the owner of the mobile telephone 3 indicates that it is ready to bear the call charge so that the mobile telephone 3 can communicate with the general public network through the closed system 2. However, the point of the present invention is to make it possible to receive the incoming and outgoing call service. It is intended to provide a mobile phone, which is not a subscriber, which has entered the closed system 2 with the same function as that of a cordless red telephone. That is, when a non-subscriber mobile telephone 3 enters the closed system 2 and wants to receive service, if the special number for registration displayed in the vicinity is known and the special number for registration is transmitted, This is registered in the closed area system 2 and then in the wide area system 1. FIG. 5 (a) shows an example of the procedure. This special number for registration does not necessarily have to be dialed from the mobile telephone 3 as a whole.
It suffices to send a call from the closed system 2 to the wide area system 1 at the same time as the location registration in the closed system 2 or the speed dial. After the location registration in the wide area system 1, the incoming call service is set to the fifth step by the procedure of FIG. 5 (b).
The calling service can be received by the procedure shown in FIG.
That is, the mobile telephone 3 and the closed system 2 function as if they were incorporated into a part of the wide area system 1. When the mobile telephone 3 is registered in the wide area system 1 via the closed area system 2, the mobile phone 3 can make a call within the closed area service area, and in addition, can automatically receive.
Calling is performed with "0" prefix as in the case of closed system 2 subscribers, reducing the burden on the wide area system as a general treatment of calling the other party's number, and only receiving the call according to the procedure shown in Fig. 5 (b). Of course, it is also possible for the mobile phone 3 to bear the burden.

Even if the mobile phone 3 is a subscriber of the closed system 2, the closed system 2
Needless to say, if it is desired to receive an incoming call from the wide area system 1 directly without going through the incoming call relay by the telephone switch, the location registration to the wide area system 1 via the closed area system 2 is required.

When the mobile telephone 3 is switched to the closed mode, the mobile telephone 3
Transmission power is automatically set to the lowest level or lower to minimize interference to wide area systems.

Another embodiment of the present invention is shown in FIGS. The present embodiment is an example in which a closed mobile radio telephone system (closed system) 2 according to the present invention is applied to a cellular mobile radio telephone system (wide area system) 1 which has already been provided with services in North America.
The main difference from the embodiment of FIG. 1 and FIG. 2 is that the car telephone exchange 6 of the wide area system 1 is different in the rank of the exchange connected to the general public network. It is connected to the lowest-ranking terminal EO exchange. Further, since the control system and signal format of the wireless line are also different, it is desirable that the system adopted in the closed system 2 is the same as the system adopted in the wide area system 1 in order to minimize the additional functions of the mobile telephone 3. .

FIG. 7 shows a telephone line connection method for the closed system 2 and the wide area system 1. The communication line of the mobile telephone 3 is wireless with the closed base station 4 and thereafter is wired, and is connected to the wide area system 2 and the general public network via the closed mobile exchange 5 and the car telephone exchange 6. That is the same as the above-mentioned embodiment. The connection control of the communication line is performed by transmitting and receiving signals from the dial pulse transmitter / receiver 7 '. Also in this embodiment, the control channel C / CH of the closed base station 4 performs data communication until the mobile telephone 3 and the closed base station 4 start a call, and the signal format thereof is the same as the signal format of the wide area system 1. To use. The signal format is US Electronics Industries Association (Electr
onic Industries Association) Interim Standard, IS-3-B. Its source is found in Bell System Technical Journal, Vol. 58, No. 1, p. 43. Fig. 8 shows the outline of the call signal (ST) 10KHz and supervisory signal (SAT) 6KHz, 6KHz.
The closed connection status of the mobile phone is monitored by three waves of ± 30Hz. The control channel C / CH of the wireless line is used to specify the call channel S / CH before entering the call state, and like the above-described embodiment, BCH (Bose-Chauhuri-Hocquengh) is used.
em) to perform data communication using the code. Even during a call, data communication such as channel designation due to the change of closed base station is performed. This control signal is communicated between the closed base station 4 and the closed mobile exchange 5 via the data link D.LK of FIG.

The location registration from the closed system 2 to the wide area system 1 is performed in the same manner as in the above-mentioned embodiment, and the car telephone exchange AMC of FIG.
, A touch-tone transmitter PBOS and a touch-tone receiver PBRC
Is read as a dial pulse transceiver.

The present invention can also be applied to the case where the frequency channels of the wide area system 1 are not reused in the closed area system 2 doubly. If the frequency channel band adjacent to the frequency channel band of the wide area system 1 is used for the closed system 2, the purpose can be achieved by slightly widening the high frequency circuit of the mobile phone 3.

The mobile phone 3 is manually switched to the closed mode,
When returning from the closed mode to the wide area mode, it is desirable to enable automatic return. The automatic return may be performed, for example, by automatically returning to the wide area mode after a fixed time after the control channel C / CH of the closed base station 4 cannot be received.

〔The invention's effect〕

According to the present invention, (1) even in a building or the like where there is a radio disturbance of a cellular mobile radio telephone, a mobile telephone which is not a closed-system subscriber is provided with the same function as that of a cordless conventional red telephone.
It is possible to receive calling and receiving services and to make calls at the expense of the mobile phone owner.

(2) The cellular mobile radio telephone service area will be expanded to the premises of buildings, etc., and its spread will be promoted. The closed system installer can receive the cellular mobile telephone service when the mobile telephone is taken out of the door.

(3) The mobile telephone can be greatly convenient only by adding some additional functions to the one used in the cellular mobile radio telephone system.

(4) The closed-system hardware can be constructed economically because almost all electronic components used in the cellular mobile radio telephone system can be used.

[Brief description of drawings]

FIG. 1 is a connection diagram of closed and wide area telephone lines according to an embodiment of the present invention, FIG. 2 is a connection diagram in which the present invention is applied to a cellular NTT type mobile telephone system in service in Japan, and FIG. FIG. 4 is a diagram showing an example of a data communication signal on the closed base station side, FIG. 4 is an embodiment diagram showing a location registration procedure for a closed system and a wide area system, and FIG. 5 is an embodiment diagram showing a location registration procedure for a wide area system. FIG. 6 is a connection diagram in which the present invention is applied to a cellular mobile radiotelephone system in service in North America, FIG. 7 is a connection example diagram between a closed system and a wide area system in that case, and FIG. 8 is FIG. It is a figure which shows the data communication signal by the side of a closed base station in the case of. <Explanation of Codes> 1 ... Wide area mobile radio telephone system (wide area system) 2 ... Closed mobile radio telephone system (closed area) 3 ... Mobile telephone 4 ... Closed base station 5 ... Closed mobile exchange 6 ... Automobile telephone exchange 7 ... Push phone Transmitter 8 ... Touch-tone receiver 9 ... Wide area car telephone base station 10 ... General public line

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical indication location H04Q 7/34 7/36 7304-5K H04Q 7/04 J 7304-5K H04B 7/26 105 A 7304 -5K 109 B

Claims (5)

[Claims] 1. A frequency band is allocated to a plurality of base stations, each of which forms a predetermined service area, so as to communicate with a mobile radio telephone by using different frequency channel bands in adjacent service areas. A closed-range mobile radiotelephone system located in one of the service areas of the wide-area mobile radiotelephone system, wherein one of a plurality of frequency channel bands used in the wide-area mobile radiotelephone system is used in the closed-system. If the mobile radio telephone that has entered the closed system and is not a subscriber of the closed mobile radio telephone system after communicating with the mobile radio telephone of A closed mobile radio telephone characterized by starting an outgoing call service to a general public telephone line via a closed system according to information to be stored. Stem. 2. If the mobile radio telephone is not a subscriber of the closed mobile radio telephone system, the location registration is performed in the wide area exchange as well as in the closed exchange, and the closed system is established based on the information held by the mobile radio telephone. The closed mobile radiotelephone system according to claim 1, wherein the originating and terminating communication services are started via the closed mobile radiotelephone system. 3. When the mobile radio telephone is not a subscriber of the closed mobile radio telephone system, the location registration is performed by previously providing special registration numbers at a plurality of locations in the closed system. The closed mobile radio telephone system according to claim 1 or 2, characterized in that the owner of the mobile radio telephone which is not a subscriber makes a location registration request using the special number. 4. The location registration in the case where the mobile radio telephone is not a subscriber of the closed mobile radio telephone system, automatically returns to the state before the location registration after a lapse of a certain time after the call ends. The closed mobile radio telephone system according to claim 1 or 2. 5. A signal format of a communication channel and a control channel between the closed system and the mobile radio telephone is the same as the signal format adopted in the wide area system. A closed mobile radiotelephone system according to claim 1 or 2.