JPH0220127A - Radio telephone system - Google Patents

Abstract

PURPOSE:To attain the outgoing incoming call connection control without making huge the connecting time by scanning a call channel with respective moving stations, detecting the call channel used for an incoming call connecting control with a base station, entering the receiving posture with the call channel and responding with one designated moving station. CONSTITUTION:A base station radio-transmits, first, an incoming call signal with a prescribed call channel to the incoming call from an exchange. The incoming call signal includes a group code and the identification code of a special moving station. Next, a responding signal reception from the moving station designated by the identification code is confirmed and a bell ON signal and a bell OFF signal to stick a group code are radio-transmitted. The moving station scans respective call channels of the radio line with a constant sequence and when the signal is received by the scanning process, confirms the coincidence and dissidence of the group code and the identification code. When the group code is made coincident, a scanning action is stopped at the time point, and the call channel used by the base station of the self-system is detected. At this time, the moving station to make coincident the identification ode at the time of receiving the incoming call signal returns a response signal, enters the receiving posture, and the dissident moving station singly executes the mere stoppage of the scanning action and enters the receiving posture.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a radio telephone system, and particularly to a multi-channel access type radio telephone system that performs call connection control without using a control channel.

(Prior Art) The wireless telephone system to which the present invention is directed is a so-called 1:N cordless telephone system, for example, as shown in FIG. A base station 61 as a station and a plurality of mobile stations (62, 63, 64,
...).

The multi-channel access method is a method in which a plurality of systems illustrated in FIG. 6 are arranged adjacently. That is, although the base stations in each system are connected to different subscriber lines, each system shares a radio line with the same frequency.

It should be noted that a conventionally well-known radio telephone system provides a control channel separate from a communication channel, and uses this control channel to perform call connection control.

(Problems to be Solved by the Invention) By the way, systems using control channels have many advantages such as short connection time and good controllability, but on the other hand, if the control channel cannot be used for some reason, It also has the disadvantage that it is impossible to control outgoing and incoming call connections.

Therefore, based on the request that emphasis should be placed on system reliability even if there are some difficulties in connection time and controllability, the present invention has been developed to provide a multi-chat system that allows call connection control to be performed without using a control channel. This is an attempt to horizontally build a wireless telephone system using wireless access. At this time, the problem is how to solve the following points.

First, in response to an incoming call from the exchange, the base station uses any one communication channel to send the incoming call signal etc. to all mobile stations, but the mobile station selects one of the multiple communication channels. It is necessary to be able to detect the speech channel.

Furthermore, if the mobile station that receives the incoming call signal decides to freely send back a response signal, since the base station has only one radio, there is a possibility that the response signals will collide and cannot be received. In order to avoid this, it is conceivable to send an incoming call signal to each mobile station and request a response. In this case, it takes a considerable amount of time to connect the incoming call.

The present invention was made in response to such demands, and an object thereof is to provide a wireless telephone system that can perform call connection control using any one communication channel without prolonging the connection time. There is a particular thing.

(Means for Solving the Problems) In order to achieve the above object, the wireless telephone system of the present invention has the following configuration.

That is, the wireless telephone system of the present invention consists of a base station connected to an exchange and having one radio, and a plurality of mobile stations wirelessly connected to this base station, and can control incoming and outgoing calls without using a control channel. A multi-channel access wireless telephone system that performs the following: The base station includes a storage means for storing a group code indicating a mobile station group belonging to the base station and an identification code of the mobile station; searching means for searching for an empty communication channel; and forming an incoming call signal containing the group code read from the storage means and the identification code of the specific mobile station in response to detection of an incoming call from the exchange; a first control means for transmitting on the detected idle communication channel; a bell ON signal or a bell OFF signal according to the signal state of the ringing signal from the exchange in response to reception of a response signal to the incoming call signal;
a second control means for forming a signal and transmitting it on the same communication channel used for transmitting the incoming call signal; The scanning operation is stopped when it is confirmed by the matching of the group codes that the signal received during the scanning process is either an incoming call signal, a bell ON signal, or a bell OFF signal related to the base station transmission of the own system. and a channel scanning means for detecting a communication channel used by a base station of its own system; when the cause of the stoppage of the scanning operation is reception of an incoming call signal, it checks whether the identification numbers match, and when they match, creates the response signal. and a response control means for transmitting it; and a response control means for transmitting it;
and a drive means for driving the bell to ring in response to reception of the bell OFF signal.

(Function) Next, the function of the wireless telephone system of the present invention configured as described above will be explained.

In response to an incoming call from the exchange, the base station wirelessly transmits an incoming call signal through a predetermined communication channel.

This incoming call signal contains the group code and the identification code of the specific mobile station.Then, the reception of a response signal from the mobile station designated by the identification code is acknowledged and a bell ON signal or a bell OFF signal is wirelessly transmitted. Of course, a group code is attached to the bell ON signal and the bell OFF signal.

On the other hand, the mobile station scans each communication channel of the radio line in a fixed order, and when it receives a signal during the scanning process, it confirms whether the group code and the identification code match. Then, since the signal with the matching group code is either an incoming call signal, a bell ON signal, or a bell OFF signal transmitted by the base station of the own system, the scanning operation is stopped at that point and the base station of the own system Discover the call channel used by.

At this time, when the mobile station receives the incoming call signal, the mobile station whose identification code matches stops its scanning operation, returns a response signal, and enters reception mode; however, the mobile station that does not match only stops its scanning operation and enters reception mode. to go into. In this way, a plurality of mobile stations can receive the bell ON signal and bell OFF signal transmitted by the base station of their own system and drive their bells to ring.

In other words, multiple mobile stations can receive call connection control from the base station via one communication channel. Here, since the base station obtains a response signal from only one mobile station, the connection time does not become long.

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

As shown in FIG. 1, a base station according to an embodiment of the present invention includes a hook switch 1 that forms a current loop in a subscriber line when making and receiving calls, and a 2-wire to 4-wire converter 2. Amplifier 3
, a data modulation section 4, a transmission section 5, a control section 6 that realizes various functions of the base station, a ROM 7 in which group codes, identification codes for each mobile station, etc. are stored, and an incoming signal from a subscriber line. (ringing signal), an amplifier 9, a data demodulator 10, a receiver 11, a synthesizer 12 that generates a timing signal, an antenna duplexer 13, and an antenna 14. be prepared for.

Further, as shown in FIG. 2, a mobile station according to an embodiment of the present invention includes a microphone 21, a key switch 22, an amplifier 23, a data modulation section 24, a transmission section 25, and the mobile station. A control section 26 that realizes various functions, a ROM 27 that stores group codes and identification codes of own station, etc., a speaker 28, an amplifier 29, a data demodulation section 30, a reception section 31, and generates a timing signal. Synthesizer section 3
2, an antenna duplexer 33, and an antenna 34.

The signals used for controlling the outgoing and incoming call connections, for example, as shown in FIG. 3, are composed of a preamble, a frame same U1 signal, a command, a BT code, an identification (ID) code, and a check pit.

The control unit 6 (26) of the base station and mobile station searches each communication channel of the wireless line in a fixed order and examines the usage status. (b).

First, when a mobile station makes a call, this is basically the same as a conventional one-to-one wireless telephone device (cordless telephone), as shown in FIG. 4, for example. That is, for example, in the mobile station 2, when the key switch 22 is operated, the control unit 26 reads the group code (
If necessary, (including the D code) is read out and a calling signal containing this is generated. Further, the control unit 26 sends the designation of the vacant communication channel detected as a result of the search operation to the transmission unit 26.
Send to 5. As a result, the calling signal is transmitted to the data modulator 24,
The signal is continuously transmitted wirelessly via the transmitter 25, the antenna duplexer 33, and the antenna 34 ((1) in FIG. 4).

The control unit 6 of the base station constantly scans each communication channel in preparation for receiving a control signal from a mobile station, and when a received signal is input from the data demodulation unit 10, it stops scanning and specifies the communication channel. At the same time, a response signal is output to the data modulation section 4. As a result, a response signal is wirelessly transmitted via the transmitter 5, the antenna duplexer 13, and the antenna 14 (FIG. 4 (2)), and the controller 6 controls the hook switch 1 to connect the subscriber line. Well-known operations follow, such as forming a current loop, and a call between the mobile station 2 and the outside world is established via the base station.

Next, the operation when there is an incoming call from the exchange is as shown in FIG. 5, for example. Now, as ID codes, mobile station 62 has ID#1, mobile station 63 has ID#2, and mobile station 64 has ID#3.
It is assumed that these are stored in the ROM 7 of the base station, and that the corresponding ID code is stored in the ROM 27 of the mobile station.

When a current loop is formed in the subscriber line, the control unit 6 of the base station issues the designation of the vacant communication channel detected by the above-mentioned search operation to the transmitting unit 5, and also sends the group code and ID code ID#1 from the ROM 7. is read and an incoming call signal containing it is generated. This is transmitted via the data modulator 4 to the transmitter 5.
sent to.

As a result, the incoming call signal is routed to a predetermined communication channel (e.g. CI
+20>, it is continuously transmitted wirelessly multiple times.

On the other hand, the control unit 26 of the mobile station sequentially scans from Cl11 in preparation for receiving a control signal from the base station, and when the base station transmits the first incoming call signal, the mobile station 62 is scanned from Cl11.
The scanning position of l0, the mobile station 63 is the scanning position of C1115,
It is assumed that the mobile stations 64 are located at each scanning position of C115.

An incoming signal related to base station transmission is input to the control unit 26 via the antenna duplexer 33, the receiving unit 31, and the data demodulating unit 30. First, the mobile station 63 reaches the scanning position of CI+20, and the incoming call signal is captured. Then, the control unit 26 determines whether or not the group code matches the ID code (ID#1). Since the ID code of the mobile station 63 is ID#2, the group codes match but the ID codes do not match.Therefore, the control unit 26 of the mobile station 63 stops channel scanning because only the group codes match. , and enters reception mode at C1120 without returning a response signal.

Next, the mobile station 62 receives CI! 20 scanning positions are reached;
An incoming call signal is taken in, and the control unit 26 determines whether or not the group code matches the ID code (ID#1). Since the ID code of the mobile station 62 is ID#1,
Both the group code and ID code match. Therefore, mobile station 6
The control section 26 of No. 2 stops channel scanning, generates a response signal and outputs it to the data modulation section 24, and also sends a communication channel designation to the transmission section 25, and sends the communication channel designation to the transmission section 25.
Become ready to receive.

The control unit 6 of the base station receives the response signal from the mobile station 62, and
Read the output state of the ringing signal detection section 8 and turn on the bell O.
Generates an N signal or a bell OFF signal. These are C
At 1120, it is wirelessly transmitted multiple times in succession.

Therefore, as mentioned above, mobile station 62 and mobile station 6
The control unit 26 of No. 3 outputs the bell O output from the data demodulation unit 30.
For example, the speaker 28 is driven to generate intermittent sound in response to the N signal or the bell OFF signal.

On the other hand, in the mobile station 64, the channel scanning position did not reach C1120 during the transmission period of the incoming call signal, but reached the scanning position of 01120 after the transmission of the bell ON signal and the bell OFF signal was started. The signal is received by the control unit 26, and the match of the group codes, etc. is confirmed in the same manner as described above. When the match is confirmed, the control unit 26 stops the channel scanning, and the control unit 26 stops the channel scanning,
Similarly, the speaker 28 is driven to generate intermittent sound in response to the N10FF signal.

In the manner described above, each mobile station detects the communication channel used by the base station and receives call connection control via the communication channel.

Note that it is assumed that the mobile station 62 to which the base station specifies a response is out of range, or that the mobile station 62 is turned off and does not respond. In this case, for example, do as follows. When the base station cannot receive a response signal to the incoming call signal within a certain period of time, it changes the communication channel and sends out the incoming call signal again. At this time, the ID code included in the incoming call signal is also changed.

For example, change the ID code from ID#1 to ID#2. Thereby, even if the mobile station 62 is out of range, if the mobile station 63 is within range, wireless connection can be made.

(Effects of the Invention) As explained above, according to the wireless telephone system of the present invention, each mobile station scans the communication channels, detects the communication channel used by the base station for incoming call connection control, and performs the communication. Since one designated mobile station responds when the mobile station enters reception mode on the channel, the incoming call connection time does not become long.

Thus, according to the present invention, it is possible to provide a radio telephone system that can perform call connection control using any one communication channel without increasing the connection time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of a base station according to an embodiment of the present invention, FIG. 2 is a block diagram of the configuration of a mobile station according to an embodiment of the present invention, and FIG. An example of a signal format, FIG. 4 is a flowchart of a calling operation, FIG. 5 is a flowchart 1 of an incoming call operation, and FIG. 6 is a block diagram of the configuration of a wireless telephone system. 1... Hook switch, 2...2
Line-4 line converter, 3,9,23.29...Amplifier, 4.24...Data modulation section, 5,25
...... Transmission section, 6,26... Control section,
7.27...ROM, 8...Ringing signal detection section, 10.30...Data demodulation section, 11.31...Reception section, 12.32
......Synthesizer section, 13.33...Antenna duplexer, 14.34...Antenna,
61...Base station, 62.63.64...
...Mobile station. Agent Patent Attorney Yoshihiro Yahata Figure 4- Figure 4

Claims (1)

[Claims] A multi-channel access wireless telephone system consisting of a base station connected to an exchange and having one radio, and a plurality of mobile stations wirelessly connected to this base station, which performs call connection control without using a control channel. The base station includes a storage means for storing a group code indicating a group of mobile stations belonging to the own system and an identification code of the mobile station; and a search unit for searching each communication channel of a wireless line and detecting an empty communication channel. means for forming an incoming call signal including the group code read from the storage means and the identification code of the specific mobile station in response to the detection of an incoming call from the exchange, and transmitting it on the detected empty communication channel; 1, the control means; in response to the reception of the response signal to the incoming call signal, a bell ON signal or a bell OFF signal is formed according to the signal state of the ringing signal from the exchange, and the signal is used to transmit the incoming call signal; a second control means for transmitting on the same communication channel;
The mobile station scans each communication channel of the wireless line in a fixed order, and the signals received in the scanning process are used as an incoming call signal transmitted from the base station of the own system, or as a bell ON.
channel scanning means for stopping the scanning operation and detecting the communication channel used by the base station of its own system when it is confirmed by the coincidence of the group codes that the signal is either a signal or a bell OFF signal; response control means for checking whether the identification numbers match and mismatch when the cause is reception of an incoming call signal; and when they match, creating the response signal and transmitting it; 1. A wireless telephone system comprising at least: driving means for driving a bell to ring in response to reception of an OFF signal.