JPH09181855A - Digital ratio telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select an optional PHS base station from among plural nearly PHS base stations available. SOLUTION: Based on a reception level from a MODEM demodulator 33, a PHS telephone set 5 detects a PHS base station whose reception level of a radio wave received from each PHS base station is a prescribed level or over capable of stable communication and stores position registration area information received from the PHS base station to a PHS base station management table provided to a memory 54. In the case of dialing, the PHS telephone set 5 selects any of the information of each PHS base station stored in the PHS base station management table based on a prescribed criterion and makes a dialing to the selected PHS base station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital wireless telephone system containing a digital wireless telephone.

[0002]

2. Description of the Related Art In recent years, a digital wireless telephone service called PHS (Personal Handyphone System) has been started, and its service range is currently expanding rapidly. Bring your PHS phone (hereinafter referred to as PHS phone) to the nearest P
A call can be freely made via the HS base station. Further, in such a system, a plurality of time slots are prepared between the PHS base station and the PHS telephone, and one P
Since the HS telephone makes a call through one of the plurality of time slots for each of the up and down timeslots, it is possible to make a call by a plurality of PHS telephones at the same time.

In the conventional digital radio telephone system, P
When there are multiple PHS base stations near the HS telephone, the PHS telephone compares the reception levels of the radio waves transmitted from the PHS base stations, and the PH with the highest reception level is compared.
By selecting the S base station and performing predetermined location registration,
Various call controls for PHS telephones were performed via the PHS base station.

[0004]

Therefore, in such a conventional digital radio telephone system, when a plurality of PHS base stations exist in the vicinity of the PHS telephone, the PHS base station having the highest reception level is selected and the position is set. Since the registration is performed, there is a problem that the reception level is not the maximum but cannot be selected even if there is another PHS base station having a reception level that allows sufficient communication. For example, when there are a plurality of PHS base stations having a certain level of reception near the boundary between local / international calls, it is not possible to select the PHS base station with the cheaper call charge according to the other party. The present invention is intended to solve such a problem, and a plurality of P's that can communicate with each other in the vicinity are provided.
An object of the present invention is to provide a digital wireless telephone system capable of selecting an arbitrary PHS base station from HS base stations.

[0005]

In order to achieve such an object, a digital radio telephone system according to the present invention is
The wireless base station includes a storage unit that stores position registration area information corresponding to its own installation position, and a control unit that notifies the position registration area information to a digital wireless telephone located in its own wireless area, The digital wireless telephone has a wireless base station management table that stores the location registration area information of wireless base stations with which communication is possible, and a wireless base station with a reception level of the radio wave transmitted from the wireless base station that is above a predetermined level that enables stable communication. Select a station and save its location registration area information in the radio base station management table, and select one of the location registration area information stored in this radio base station management table according to a predetermined criterion when making a call. And a control means for performing transmission processing. Therefore, in the digital radio telephone, a radio base station with a reception level of the radio wave transmitted from the radio base station that is equal to or higher than a predetermined level that enables stable communication is selected, and the location registration area information is stored in the radio base station management table. At the time of making a call, any of the location registration area information stored in this radio base station management table is selected according to a predetermined reference, and the call originating process is performed.

Further, the digital radio telephone is provided with correspondence data indicating the order of the call charges from each location registration area for an arbitrary communication partner, and the control means refers to this correspondence data at the time of making a call, thereby the radio base station. Among the wireless base stations stored in the station management table, the wireless base station having the lowest call charge to the dialed-in party is selected and transmitted. Therefore, when making a call, the corresponding data is referred to, and the location registration area information with the lowest call charge to the dialed party is selected from the location registration area information stored in the wireless base station management table. Call origination processing is performed.

[0007]

Next, the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a configuration example of a digital wireless telephone system according to an embodiment of the present invention, P
This system, which is called HS, includes exchanges 1A and 1B,
A center device 2 accommodated in each exchange 1A, 1B, each PHS base station (BS) 3A connected to the exchange 1A, each PHS base station (BS) 3B connected to the exchange 1B,
PHS telephone (PS) wirelessly connected to each PHS base station
5A to 5C. Each PHS base station has a circular wireless area shown in the figure, and in particular, the PHS telephone 5C is located in both wireless areas of the PHS base stations 3A and 3B.

FIG. 2 is a block diagram showing the configuration of the PHS base station 3 connected to the exchange 1 via the ISDN line. In the figure, 31 is a wireless transmission / reception unit that transmits and receives wireless signals to and from a PHS telephone, and 32 is a CP that controls the base station 3.
U (control means), 39 is a memory for storing predetermined position registration area information corresponding to its own installation position, 33 is a modem demodulator for demodulating a received signal, 34 and 36 are channel codecs, 35 is a voice codec, 37 is a modem modulator. In addition, the voice codec 35 has two lines 4
The line conversion unit 30 is connected. And the PHS base station 3
Is a 2-line to 4-line conversion unit 30 and an I interface unit 38.
It is connected to the exchange 1 via.

Here, the radio transmitter / receiver 3 of the PHS base station 3
1 is configured as follows. That is, 311 is an antenna switch for switching between transmission and reception of the antenna AT, 312
Is a reception amplifier that amplifies a reception signal, 313 is a first mixer, 314 is a second mixer, and 315 is an intermediate frequency generator. Further, 316 is a quadrature modulator, 317 is a third mixer,
318 is a transmission amplifier that amplifies a transmission signal, and 319 is a first
Is a PLL synthesizer for supplying signals of respective predetermined frequencies to the third mixer and the quadrature modulator 316.

Next, FIG. 3 is a block diagram showing the configuration of the PHS telephone 5 wirelessly connected to the PHS base station 3. In the figure, since the configuration of the wireless transmission / reception unit and the like is the same as that of the PHS base station 3, the same parts are designated by the same reference numerals and the description thereof is omitted. The difference in configuration from the PHS base station 3 is that
A CPU 52 (control means) includes a keyboard 52 and a display unit 53.
And the memory 54 is connected, and D /
That is, the speaker SP and the microphone MIC are connected to the voice codec 35 that performs A conversion or A / D conversion. In addition to this, a buzzer BZ is connected to the CPU 51 so that it sounds when an incoming call arrives.

When carrying such a PHS telephone 5 and operating the keyboard 5 to make a dial call, the operation information is transmitted to the nearest PHS base station 3 via the control channel of the wireless transmission / reception unit 31. . When the PHS base station 3 receives this operation information, the I interface unit 38 performs a calling protocol with the exchange 1 to cause the other telephone terminal accommodated in the exchange 1 or another exchange via the exchange 1. Make a call to the other party's telephone terminal accommodated in. Then, according to the response from the partner telephone terminal, a call is started between this telephone terminal and the PHS telephone 5.

Further, when an incoming signal arrives from the PHS base station 3 side via the control channel of the wireless transmission / reception unit 31, PH
The CPU 51 of the S telephone 5 detects this incoming signal and sounds the buzzer BZ or blinks the lamp to notify the incoming call. Here, when the keyboard 52 is operated on the PHS telephone 5 side and this is transmitted to the PHS base station 3 side as an incoming call response signal, the PHS base station 3 establishes a call channel with the PHS telephone 5, and as a result, An incoming call response call is made by the PHS telephone 5.

Further, in the memories 39 of the PHS base stations 3A and 3B, predetermined location registration area information is preset corresponding to the respective installation areas, and the location registration area information held by each of them is stored in the PHS base station 3A. , 3B notify the PHS phones 5A to 5C in the respective areas.

Next, the operation of the first embodiment of the present invention will be described with reference to FIG. FIG. 4 is a flowchart showing the operation according to the first embodiment of the present invention. Here, the PHS telephone 5C is provided with charge data for each calling / receiving area, and the call fee corresponding to an arbitrary call partner is low at the PHS telephone 5C according to the location registration area information from the PHS base stations 3A and 3B. An example will be described in which the PHS base station is selected. Therefore, P
Correspondence data in the order of call charges is stored in the memory 54 of the HS telephone 5C as correspondence data between each call originating / receiving area.

Since the PHS base stations 3A and 3B recognize the PHS telephone located in the radio area of the PHS base stations 3A and 3B, the PHS base stations 3A and 3B are always P
The position registration area information of its own set in the memory 39 is transmitted to the HS telephone. PHS phone 5
Compares the location registration area information received from an arbitrary PHS base station with the current location registration area information held in the memory 54, and if they are different, determines that the location registration area has changed due to its own movement. Then, a predetermined location registration request is transmitted (step 40).

This location registration request is transferred to the exchange 1A or 1B via the PHS base station 3A or 3B, and the exchange 1A or 1B performs location registration processing on the center unit 2. As a result, the in-zone position of the PHS telephone 5C is registered, and subsequent call control for the PHS telephone 5 is performed by the exchange 1A or 1B and the PHS base station 3A or 3B.

Next, the PHS telephone 5C determines, based on the reception level from the modem demodulator 33, that the reception level of the radio wave received from each PHS base station is equal to or higher than a predetermined level that enables stable communication. The location registration area information detected and received from the PHS base station is stored in the PHS base station management table provided in the memory 54 as shown in FIG. 5 (step 41).

In this way, the location registration area information is received from the PHS base stations 3A and 3B closest to the PHS telephone 5C (step 42: NO) and stored in the PHS base station management table. Here, in the PHS telephone 5C, the PHS that has obtained the reception level that enables stable communication
As the base stations, the PHS base station 3A and the PHS base station 3B are detected and stored and managed.

When the storage of the location registration area information from each PHS base station is completed (step 42: YES),
The position registration area information of the PHS base station having the maximum reception level is compared with the current position registration area information held in the memory 54 (step 43). When it is determined that it has changed (step 43: YES), the process returns to step 40 and the above-mentioned position registration request is made again.

When the information in the location registration areas match (step 43: NO), it is determined that the user has not moved, and the dial operation of the keyboard 52 is checked to determine whether or not the call operation is performed. It is judged whether or not the call has been made (step 44), and when the calling operation is not detected (step 44: NO), the process returns to step 43. On the other hand, if a calling operation is detected (step 44: Y
ES), and performs the following line selection processing to make a call.

First, the dial number indicating the other party of the call input from the dial key of the keyboard 52 is checked (step 45), and the call charge order between the calling and receiving areas stored in the memory 54 as shown in FIG. PHS with the lowest call rate to the other party by referring to the corresponding data
A base station is selected (step 46). FIG. 6 is an explanatory diagram showing the call charge order correspondence data between the outgoing and incoming areas.
Here, the receiving side, that is, the receiving area of the communication partner, is arranged in the row (horizontal) direction, and the transmitting side, that is, the position registration area information of each PHS base station is arranged in the column (vertical) direction.

The selection order of each calling side with respect to each called side is given to each line intersection in the order of lowest call charges. For example, for the incoming call side area "045" on the receiving side, the PHS base station (not shown) of the position registration area information "BS3C" on the calling side is set as "1", and the position registration area information "BS3B" is set. PHS base station 3B of is set as the "2" rank, and PHS of location registration area information "BS3A" is further set.
Base station 3A is set as "3".

Therefore, for example, when the other party of the call belongs to the incoming call area "045", it is selected from the higher order of the PHS base stations corresponding to the location registration area information of each calling side. Here, since the location registration area information "BS3C" corresponding to "1" is not registered in the PHS base station management table described above (see FIG. 5), the location registration corresponding to the next "2" is registered. Area information “BS3B”, that is, the PHS base station 3B having the second reception level is preferentially selected.

In this way, of the PHS base stations that can be transmitted from the PHS telephone 5C, the PHS base station 3B that has the lowest call charge to the dialed party is selected, and the PHS telephone 5C to the PHS base station is selected. Dialing is made to 3B (step 47). In response to this, in the PHS base station 3B, the I interface unit 38
Performs a calling protocol with the exchange 1B, whereby the exchange 1B makes a call to the call partner accommodated in the other exchange, and the call is started in response to the call partner (step 48). According to the end, a predetermined call termination process is performed (step 49).

In this way, the PHS telephone 5C is the nearest PHS base station 3 at which the reception level at which communication is possible is obtained.
The location registration area information of A and 3B is stored in the PHS base station management table, and when calling, these PH
Since I chose to select one of the S base stations,
Compared with the conventional case where only the PHS base station with the highest reception level is selected, if there is another PHS base station with a reception level that is not the maximum but is sufficiently communicable, select it. Therefore, it is possible to provide a wide range of services to users.

Further, the PHS telephone 5C is provided with the data corresponding to the call charge order between the calling and receiving areas, and the call charge is the lowest among the PHS base stations stored in the PHS base station management table for the dialed party. Since the PHS base station is selected and the transmission is performed, compared with the conventional case where only the PHS base station having the maximum reception level is selected, the reception level is not the maximum but communication is sufficiently possible. Moreover, it is possible to select a PHS base station with a low call charge, and it is possible to reduce the call charge.

[0027]

As described above, according to the present invention, the digital radio telephone is provided with the radio base station management table for storing the location registration area information of the communicable radio base stations, and the data is transmitted from the radio base station. Select a wireless base station with a certain level or higher for stable communication of radio waves and save its location registration area information in the wireless base station management table, and save it in this wireless base station management table when making a call. Since any one of the location registration area information that is present is selected according to a predetermined criterion and transmission processing is performed, compared to the conventional case where only the radio base station with the highest reception level is selected, the reception level is higher. It is possible to provide a wide range of services to users by selecting it when there is another radio base station with a reception level that is not the maximum but is sufficient for communication. It made.

Furthermore, the digital radio telephone is provided with corresponding data indicating the order of the call charges from each location registration area for an arbitrary call partner, and by referring to this corresponding data when making a call, the radio base station management table Among the wireless base stations stored in, the wireless base station with the lowest call rate to the dialed party is selected and the outgoing call processing is performed. Compared to the case of selecting only the station, it is possible to select a wireless base station that has a low reception level but is capable of sufficient communication and has a low call charge, and it is possible to reduce the call charge. .

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration example of a digital wireless telephone system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a PHS base station.

FIG. 3 is a block diagram of a PHS phone.

FIG. 4 is a flowchart showing an operation according to the present invention.

FIG. 5 is an explanatory diagram showing a PHS base station management table.

FIG. 6 is an explanatory diagram showing call charge sequence correspondence data between calling and receiving areas.

[Explanation of symbols]

1A, 1B ... Exchange, 2 ... Center device, 3, 3A, 3B
... PHS base station (BS), 5, 5A-5C ... PHS telephone (PS).

Claims (2)

[Claims] 1. A switch comprising a wireless base station and a digital wireless telephone wirelessly connected to the wireless base station,
In a digital wireless telephone system that performs various call controls based on the location information of the digital wireless telephone confirmed by the location registration request from the digital wireless telephone, the wireless base station uses the location registration area information corresponding to its own installation location. And a control means for notifying the location registration area information to the digital radio telephone located in its own radio area. The digital radio telephone is capable of communicating the location registration area information of the radio base station. And a radio base station management table for storing the radio base station management table, which selects a radio base station with a reception level of the radio wave transmitted from the radio base station which is a predetermined level or higher for stable communication
Control for storing the location registration area information in the radio base station management table and selecting one of the location registration area information stored in the radio base station management table according to a predetermined criterion at the time of transmission to perform transmission processing. And a digital wireless telephone system. 2. The digital radiotelephone system according to claim 1, wherein the digital radiotelephone includes correspondence data indicating the order of call charges from each location registration area for an arbitrary caller, and the control means, when making a call, By referring to this correspondence data, the wireless base station stored in the wireless base station base station management table is selected to select the wireless base station with the lowest call charge to the dialed party A digital wireless telephone system characterized in that