JP2606148B2 - Wireless communication broadcasting system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used for mobile radio communication. The present invention is suitable for use in car phones and cellular phones. The present invention provides a broadcast mode in addition to a normal communication mode in which a mobile station communicates with one other party. In the broadcast mode, a plurality of mobile stations can simultaneously receive a broadcast transmitted by a base station. Related to system improvements.

[0002]

2. Description of the Related Art Conventionally, this type of wireless communication system includes:
As disclosed in Japanese Patent Application Laid-Open No. 63-52526, there is a method for performing simultaneous broadcasting in a car telephone system. The mobile phone in this system is configured as shown in FIG. 8, and the system is configured as shown in FIG.

This mobile telephone has a PB (push-button type) telephone 51 and a call current request circuit 50 which are generally used in a mobile telephone system, and when a subscriber of the mobile telephone goes off-hook or on-hook, The call disconnection monitoring circuit 46 for monitoring the call origination and disconnection operates to send out a call request signal or a disconnection signal to the modem 43 via the call disconnection signal sending circuit 45.

The call request signal or the disconnection signal is transmitted from the antenna 40 through the transmitter 41 to the switching center 55 shown in FIG.
Sent to When the receiver 42 receives a connection request signal from the exchange 55 to one of the mobile stations (mobile telephones) 61 to 67, the broadcast switching is performed to determine whether or not a broadcast mode switching request code is added to the connection request signal. It is identified by the request receiving circuit 48. When the broadcast request signal is identified, the channel switching circuit 44 is operated by a command from the modulation / demodulation circuit 43 to switch to the broadcast radio channel, and the switching contact of the broadcast mode switching circuit 47 is switched to the loudspeaker 49 to set the broadcast mode. . Since it is actually impossible for a broadcast channel to receive another frequency allocation, the control channel is diverted to the broadcast channel in the broadcast mode.

Here, the operation of the conventional radio communication broadcasting system will be described with reference to FIG.

[0006] When a call request for simultaneous broadcasting is transmitted from a mobile station (car telephone) 61, the mobile station (automobile telephone) 61 is connected to an exchange 55 through a radio base station 52. The switching center 55 identifies that the broadcast request specific code of the mobile telephone subscriber has been received by the central processing unit 57.

[0007] The central processing unit 57 has a storage device 6 for identifying whether or not the car telephone subscriber is a broadcast-permitted subscriber.
0 is determined in advance by a broadcast-allowed car telephone subscriber directory registered in advance, and if the car is a broadcast-allowed car telephone subscriber, the communication path switch 56 is connected to the broadcast recording device 58 in order to record the broadcast contents. Record the broadcast content of. When the subscriber of the mobile station 61 goes on-hook after the end of the recording, the call disconnection monitoring circuit 46 identifies the on-hook, activates the call disconnection signal sending circuit 45, and sends a disconnection signal to the exchange 55.

The central processing unit 57 checks the disconnection signal and identifies whether or not the disconnection (on-hook) has been canceled by the car telephone subscriber. If the broadcast request has not been canceled, the central processing unit 57 reads the directory of the mobile telephone subscribers in the same service area from the storage device 60, and moves all the broadcast-permitted subscribers in the mobile telephone subscriber directory. Bureau 62,
A broadcast mode switching request code for connection is transmitted to 63 and 65.

At this time, the central processing unit 57 issues a broadcast mode setting instruction for transmitting a connection request signal to which a broadcast radio channel is added via the communication path switch 56 and the radio repeater 53. Assignment device 54
To send to. The broadcast mode switching request signal transmitted from the broadcast wireless channel allocating device 54 is transmitted to, for example, the broadcast switching request receiving circuit 48 of the mobile station 62 in the same service area.
, The modulation / demodulation circuit 43 and the channel switching circuit 4
By operating the broadcast mode switching circuit 47 via the switch 4, the switching contact of the broadcast mode switching circuit 47 is switched to the loudspeaker 49. At this time, the channel switching circuit 44 is operated to switch from the call channel to the broadcast channel, and set a broadcast mode in which broadcast can be received.

[0010] Such a broadcast mode setting is performed for the mobile stations 63 and 65 of other broadcast-permitted subscribers in the automobile telephone subscriber directory within the same service area. The mobile stations 61, 62, 63, and 65 of all the broadcast-allowed subscribers are assigned the same wireless channel by the instruction of the broadcast wireless channel allocating device 54. Connect and broadcast simultaneously.

The mobile stations 64, 66, and 67 are ordinary mobile telephones that do not allow simultaneous broadcasting.
1, 62, 63 and 65 are automobile telephones that allow simultaneous broadcasting. Each of the mobile stations 61, 62, 63, and 65 is configured as shown in FIG.

FIG. 10 is a diagram showing an example of a channel arrangement in a conventional radio communication broadcast. Channel control from the wireless base station side to the mobile station side is performed using a control channel. The mobile station sets a channel to the control channel 68 when a call is not in progress.
By transmitting channel switching information from the wireless base station to the mobile station.

The mobile station, which has received the channel switching information to the broadcast channel 68, sets the channel to the broadcast channel 6
8 and the broadcast is received. After the reception is completed, the channel is switched to the control channel 68 again. On the other hand, the mobile station that has received the telephone call on the control channel switches to a predetermined communication channel based on the communication channel information transmitted from the wireless base station side on the control channel.

[0014]

In such a conventional radio communication broadcasting system, since the control channel and the broadcasting channel are different channels, when the mobile station switches from the control channel to the broadcasting channel. To
There is no way for the radio base station to notify the mobile station of the channel switching information. Therefore, even if a mobile station receives a call from another mobile station while receiving a broadcast, the mobile station cannot recognize the call and cannot stop the broadcast reception to shift to the call mode.

Further, since the setting of the broadcast mode is performed for each mobile station using the control channel, it takes time until the setting of the broadcast mode of all the broadcast receiving mobile stations is completed.
There is a problem that it takes too much time to broadcast to an unspecified number of broadcast receiving mobile stations.

The present invention solves such a problem, and provides a system that can immediately switch to a call mode when receiving a call from another mobile station even while receiving a broadcast. The purpose is to:

[0017]

According to the present invention, a broadcast mode is provided in addition to a normal communication mode so that a broadcast transmitted from a base station can be simultaneously received by a plurality of mobile stations. A radio link is set up between a station and one radio base station, the radio link includes a control channel and a plurality of communication channels in its frequency band, and the mobile station and the radio base station communicate via the control channel. A communication channel designated according to a predetermined control procedure, and performing communication between one mobile station and the radio base station using the communication channel, providing a broadcast channel on the radio line, The mobile station and the radio base station are means for designating a plurality of mobile stations to a broadcast mode via the control channel, and the base station is a mobile station designated to a broadcast mode. In the radio communication broadcast system comprising means for receiving simultaneously broadcast to be transmitted to the broadcast channel of the broadcast channel, characterized in that it is set by using a time division manner the frequency of the control channel.

[0018] The frequency of the control channel is repeatedly allocated to the broadcast channel in a time-division manner at regular intervals T, and the up control channel and the down control channel are set to different frequencies as the control channel. The T is set to the downlink control channel in a time-division manner, and the T is desirably 23,809 μS.

Further, the broadcast channel signal is a time-compressed signal, the radio base station is provided with a means for time-compressing a signal to be broadcast, and the mobile station is provided with a signal received from the broadcast channel. The frequency of the control channel is divided into a control slot and a broadcast channel in a time-division manner, a control signal is transmitted as a QPSK signal in the control slot, and an FM signal is transmitted in the broadcast channel. Transmitted to the mobile station, means for outputting a signal received from the broadcast channel to a speaker as an audio signal, and detecting a call signal of the own station in a control slot of the control channel while receiving the broadcast channel. Means for automatically canceling the broadcast mode and responding to the call signal; and Means for displaying an alarm when a call signal of the own station is detected in a control slot of a channel, and means for canceling a broadcast mode and responding to the call signal in accordance with an operation input performed after the alarm display Is desirable.

[0020]

According to the present invention, in addition to a control channel and a plurality of communication channels, a broadcast channel can be set in a frequency band of a radio channel set between a plurality of mobile stations and one radio base station without expanding its frequency use range. I do. This is performed by setting a broadcast channel using a control channel in a time-division manner.

The broadcast channel is preferably set using the frequency of the downlink control channel in a time-division manner. The frequency is repeatedly allocated to a broadcast channel in a time-division manner at regular intervals T (23,809 μs), and divided into control slots and broadcast channels in a time-division manner.

In the control slot, the control signal is QPSK.
The signal is transmitted as a signal, and the broadcast channel is conveniently configured to transmit the FM signal.

A time-compressed signal is used as a broadcast channel signal. The radio base station time-compresses the signal to be broadcast, and the mobile station expands the band of the signal received from the broadcast channel.

Further, the mobile station outputs a signal received from the broadcast channel to a separately provided speaker as an audio signal instead of an ordinary handset.

By doing so, the control slot of the control channel can be constantly monitored even during the reception of the broadcast channel. Therefore, when the calling signal of the own station is detected in the control slot, the broadcast mode is automatically canceled. The call signal can be answered. When a call signal of the own station is detected in the control slot of the control channel while receiving a broadcast channel, an alarm is displayed, and the broadcast mode is released in response to an operation input performed after the alarm display and the call signal is responded. You can also.

The mobile station can cancel the broadcast mode by operation while receiving a broadcast channel in the broadcast mode to perform a calling operation.

Thus, even when the mobile station is receiving a broadcast, it is possible to immediately switch to the call mode when receiving a call from another mobile station, and to return to the broadcast mode after the call ends. it can.

[0028]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the system according to the embodiment of the present invention.

In the embodiment of the present invention, a radio channel is set between a plurality of mobile stations 61 and one radio base station 52, and the radio channel includes a control channel and a plurality of communication channels in its frequency band. Mobile station 61 and radio base station 5
Reference numeral 2 denotes a configuration in which a communication channel designated according to a predetermined control procedure is selected via the control channel, and communication is performed between one mobile station 61 and the radio base station 52 using the communication channel. A broadcast channel is provided on the line, and the mobile station 61 and the radio base station 52 are provided with means for designating a plurality of mobile stations 61 to a broadcast mode via a control channel, and a radio base station 52 for the mobile station 61 designated for the broadcast mode. Means for simultaneously receiving broadcasts to be transmitted to the broadcast channel. As a feature of the present invention, the broadcast channel is set using the frequency of the control channel in a time-division manner.

The frequency of the control channel is a constant cycle T
Allocated to broadcast channels in a time-sharing manner each time,
An uplink control channel and a downlink control channel are set to different frequencies as control channels, a broadcast channel is set to the downlink control channel in a time-division manner, and a constant cycle T is 23,809 μS.

The broadcast channel signal is a time-compressed signal, the radio base station 52 is provided with a means for time-compressing the signal to be broadcast, and the mobile station 61 is used to convert the signal received from the broadcast channel into a band. The frequency of the control channel is divided into a control slot and a broadcast channel in a time-division manner, a control signal is transmitted as a QPSK signal in the control slot, and an FM signal is transmitted in the broadcast channel. . Further, the mobile station 61 has a means for outputting a signal received from a broadcast channel to a speaker as an audio signal, and automatically detects a calling signal of the own station in a control slot of a control channel while receiving the broadcast channel. Means for canceling the broadcast mode and responding to the call signal; means for displaying an alarm when a call signal of the own station is detected in a control slot of a control channel while receiving a broadcast channel; Means for canceling the broadcast mode in response to a given operation input and responding to the call signal.

Here, the embodiments of the present invention will be specifically described.

(First Embodiment) FIG. 2 is a block diagram showing a configuration of a first embodiment of the present invention, and FIG. 3 is a block diagram showing a configuration of a mobile station in the first embodiment of the present invention.

In the first embodiment of the present invention, a plurality of mobile stations 33 to
39 and one wireless base station 32 are connected by a wireless line,
The radio base station 32 includes a channel control processor 30 that outputs a control signal and performs channel allocation control, a broadcasting device 29 that outputs a broadcast signal, a timing circuit 82 that generates a timing signal, and a broadcast circuit that generates a timing signal based on the timing signal. A multiplexing circuit 28 for generating a frame by time-division multiplexing the signal and the control signal; a modulator 80 for modulating the output of the multiplexing circuit 28; And a transmitting / receiving antenna 1a for wirelessly transmitting an output from the transmitting device 26 and receiving control channel signals from the mobile stations 33 to 39.
And the output of the transmitting / receiving antenna 1a is amplified to a predetermined I
A receiving device 27 for converting to an F frequency;
A demodulator 76 for reproducing the output of the channel control processor 30 and outputting the output to the channel control processor 30, and a circulator 73 for performing transmission and reception with the same antenna. The circulator 73 can be provided in each of the mobile stations 33 to 39.

The mobile stations 33 to 39 include a frame synchronization circuit 11 for establishing reception frame timing synchronization,
A reception signal converter 77 that separates a control signal and a broadcast signal by time according to the reception frame timing and outputs the same, a communication terminal 78, and a transmission signal converter 79 that converts a transmission information signal from the communication terminal 78 into a transmission code. A communication control circuit 13 that decodes a control signal from the received signal converter 77 and executes a communication operation under the control of the radio base station 32, and generates a carrier wave of a channel specified by the control of the communication control circuit 13. The frequency synthesizer 8 and the transmission code from the transmission signal converter 79 use the frequency synthesizer 8
A modulator 80 that modulates the carrier supplied from the transmitter 80, a transmitting device 81 that converts the output of the modulator 80 to a predetermined RF frequency and amplifies the output, demultiplexes the output of the transmitting device 81, and outputs the signal from the radio base station 32. A transmission / reception antenna 1b having a demultiplexer 83 for demultiplexing the control channel signal and the broadcast channel signal, and an antenna 74 for transmitting / receiving a signal;
A receiving device 75 that amplifies the output of the duplexer 83 and converts it to a predetermined IF frequency, and a demodulator 76 that receives the output of the receiving device 75 and reproduces a signal.

The transmission signal converter 79 is composed of a coder, and the modulator 80 is a timing generator 10 for generating timing and a QPSK modulator (four-phase modulator) for modulating a signal output from the coder in accordance with the timing. ) 6. Also, the transmitting device 81 is QPS
It is composed of an up-converter 4 for converting the frequency of a signal from the K modulator 6 and a power amplifier 2 for amplifying the output power and outputting the amplified power to a splitter 83.

The receiving device 75 comprises a low noise amplifier 3 for amplifying a received signal received by the transmitting / receiving antenna 1b and a down converter 5 for frequency conversion.
Reference numeral 6 denotes a QPSK demodulator 7 for performing signal reproduction and an FM demodulator 9. Further, the reception signal converter 77
A time-division processing circuit 72 that receives the output from the M demodulator 9 and performs time-division processing based on the output timing from the frame synchronization circuit 11, and a time expander 12 that performs time expansion of the output from the time-division processing circuit 72. And a switch 14 for switching the output from the time-division processing circuit 72 and the time decompressor 12, and a decoder for decoding the output from the switch 14 and outputting it to the communication terminal 78. The coder constituting the transmission signal converter 79 and this decoder are arranged as a codex 15. In the first embodiment, the communication terminal 78 includes the telephone 16 and the speaker 17, but may include a facsimile or a teletype.

Next, the operation of the first embodiment of the present invention configured as described above will be described. First, the operation of the mobile station 33 will be described with reference to FIG.

The voice signal and the dial signal output from the telephone 16 are encoded by the codec 15 and
The signal is input to the K modulator 6. The QPSK modulator 6 modulates the signal output from the codec 15 in accordance with the timing generated by the timing generation circuit 10 and outputs the modulated signal to the up-converter 4. The up-converter 4 converts the frequency of the input signal and outputs the converted signal to the power amplifier 2. The power amplifier 2 amplifies the power of the input signal and outputs it to the transmitting / receiving antenna 1b.
Or, it transmits to other mobile stations 34-39.

A signal received from the radio base station 32 or the mobile stations 34 to 39 received by the transmitting / receiving antenna 1b is amplified by the low noise amplifier 3 and frequency-converted by the down converter 5. Down converter 5
Are input to a QPSK demodulator 7 and an FM demodulator 9 to perform signal reproduction. QPSK demodulator 7
Are output to the frame synchronization circuit 11 to establish frame synchronization.

The output of the frame synchronization circuit 11 is input to the timing generation circuit 10 to synchronize the transmission timing of the QPSK modulator 6. The other output of the QPSK demodulator 7 and the output of the FM demodulator 9 are both input to the time-division processing circuit 72, and are time-division-processed and output based on the output timing of the frame synchronization circuit 11, respectively.

At this time, if the control / broadcast channel is being received, the time division processing circuit 72 outputs the reproduced control signal to the communication control circuit 13 and simultaneously outputs the reproduced broadcast signal to the time expander 12. . On the other hand, when the communication channel is being received, the time-division processing circuit 72 outputs the communication signal reproduced by the QPSK demodulator 7 to the switch 14. Since there is no output from the FM demodulator 9, the output is not performed.

The output of the communication control circuit 13 causes the frequency synthesizer 8 to switch the QPSK modulator 6 and the QPSK demodulator 7
Of the control / broadcast channel and the communication channel. The switch 14 outputs the broadcast signal output from the time expander 12 to the codec 15 when receiving the control / broadcast channel 18, and outputs the broadcast signal from the time division processing circuit 72 when receiving the communication channel. Communication signal to codec 15
Output to The signal input from the switch 14 to the codec 15 is the on-hook signal of the telephone 16
5 is output to the speaker 17, and when the off-hook signal is output to the codec 15, the output is output to the telephone 16.

FIG. 4 is a diagram showing the configuration of a control / broadcast channel received by the mobile station in the first embodiment of the present invention.
The control / broadcast channel 18 is constituted by a control slot 19 and an FM broadcast slot 20 in a time division multiplex configuration. The control slot 19 is a QPSK-modulated burst wave, and the FM broadcast slot 20 is an FM-modulated burst wave.

FIG. 5 is a diagram showing an arrangement of channels in the first embodiment of the present invention.
It comprises a control / broadcast channel 24 for transmission to the radio stations 3 to 39, an uplink control channel 31 for transmission from a radio station to a control station, and a communication channel 25 for transmission and reception between radio stations.

The control / broadcast channel 24 is
2 to transmit and broadcast control information such as assignment of communication channels to the mobile stations 33 to 39. The uplink control channel 31 is used for transmitting a communication channel assignment request from the mobile stations 33 to 39 to the radio base station 32.

Here, the operation of the radio base station 32 in the first embodiment of the present invention will be described with reference to FIG.

The broadcast signal output from the broadcast equipment 29 and the control signal output from the channel control processor 30 are:
The control / broadcast channel 18 is time-multiplexed by the multiplexing circuit 28. The output of the multiplexing circuit 28 is input to a modulator 80 and modulated. The output of the modulator 80 is input to the transmission device 26 and is converted to a predetermined RF frequency to perform power amplification. The output of the transmitting device 80 is sent to the transmitting / receiving antenna via the circulator 73, and is wirelessly transmitted to the mobile stations 33 to 39.

On the other hand, the mobile stations 33 to 39
Signals such as a channel assignment request transmitted to 2 are received by the transmission / reception antenna 1a, amplified and frequency-converted by the receiving device 27, and input to the demodulator 76. The output of the demodulator 76 is input to the channel control processor 30.

When the mobile stations 33 to 39 are not communicating with each other, they receive the control / broadcast channel 24 transmitted from the radio base station 32 shown in FIG. At this time,
In the mobile stations 33 to 39, the broadcast signal demodulated by the FM demodulator 9 is broadcast by the speaker 17 via the time expander 12, the switch 14, and the codec 15.

Here, for example, when it is assumed that a call is made from the mobile station 33 to the radio base station 32 and the telephone 16 is off-hook at the mobile station 33, an off-hook signal is detected by the codec 15 and the speaker 17 is turned off. Stop broadcasting from. Next, when a dial signal is input from the telephone 16, it is encoded by the codec 15, modulated by the QPSK modulator 6 in accordance with the timing generated by the timing generation circuit 10, and
The frequency is converted by the power amplifier 2, the power is amplified by the power amplifier 2, and the transmission / reception antenna 1a transmits the radio base station 32
The data is transmitted by the time division multiple access method using the uplink control channel 31.

The radio base station 32 receives this signal,
The channel control processor 30 controls the allocation of empty channels. Free channel number and mobile station 3
, Are assigned to the control slot 19 shown in FIG. 4 as channel assignment information.
The mobile station 33 uses the control / broadcast channel 24 shown in FIG.
To 39.

At the same time as receiving the broadcast, the mobile stations 33 to 39 demodulate the control slot 19 with the QPSK demodulator 7 and monitor the control information with the communication control circuit 13.
In this manner, the mobile stations 33 and 34
When the communication control circuit 13 of each of the mobile stations 33 and 34 detects the identification number of the own station and the vacant channel number transmitted from the mobile station 2, the frequency synthesizer 8 controls the frequency synthesizer 8 so that the transmission and reception frequencies of the respective communication channels become a pair. The frequency of the QPSK modulator 6 and the QPSK demodulator 7 is switched under control.

In this way, the mobile stations 33 and 34 communicate with each other using the communication channel 25. After the end of the communication, the mobile station 33 returns to the control / broadcast channel 24 by detecting the on-hook signal of the telephone 16, and receives the broadcast. And terminates the call on the uplink control channel 31.
The second channel control processor 30 is notified.

(Second Embodiment) FIG. 6 is a block diagram showing a configuration of a mobile station according to a second embodiment of the present invention, and FIG. 7 is a diagram showing a configuration of a control broadcast channel according to the second embodiment of the present invention.

In the second embodiment of the present invention, the overall configuration and the configuration of the radio base station are the same as in the first embodiment. In this example, the broadcast channel is also modulated and transmitted / received by QPSK. That is, in the mobile station, as shown in FIG. 6, the FM demodulator 9 is removed from the demodulator 76 in the first embodiment, and the QPSK demodulator output is selected even in the broadcast reception mode.

In the second embodiment, control / broadcast channel 2
1 is demodulated by one QPSK demodulator 7, and the control slot 22 and the broadcast slot 23 are demodulated respectively.
It is output to the frame synchronization circuit 11 and the time division processing circuit 72.

Further, the control / broadcast channel 21 corresponds to FIG.
As shown in (1), each of them is composed of a control slot 22 and a broadcast slot 23 which are QPSK-modulated. In the case of such a configuration, if the bandwidth of the broadcast slot is the same, the sound quality may be inferior to the FM modulation, but the configuration is simplified since only one demodulator of the mobile station is required. be able to. Broadcasting other than music programs such as news can be used practically.

[0059]

As described above, according to the present invention, the control channel and the broadcast channel are formed by the time division multiplexing method, so that the mobile station can receive the control information even while receiving the broadcast, When a call is received from the mobile station, it can be immediately recognized and switched to the call mode. In addition, since all mobile stations that are not making a call can receive the control / broadcast channel, it is possible to easily broadcast to an unspecified number of mobile stations without setting up a broadcast mode.

According to the present invention, a broadcast channel can be used for a long time without being aware of the occurrence of a call.

According to the present invention, the control channel is effectively used, and the communication setting is reliably performed, so that the radio waves can be effectively used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a mobile station according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a control / broadcast channel in the first embodiment of the present invention.

FIG. 5 is a diagram showing a channel arrangement in the first embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a mobile station according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a control / broadcast channel in a second embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a wireless station in a conventional example.

FIG. 9 is a block diagram showing the overall configuration of a conventional system.

FIG. 10 is a diagram showing a channel arrangement in a conventional example.

[Explanation of symbols]

 1a, 1b, 1c Transmit / receive antenna 2 Power amplifier 3 Low noise amplifier 4 Upconverter 5 Downconverter 6 QPSK modulator 7 QPSK demodulator 8 Frequency synthesizer 9 FM demodulator 10 Timing generation circuit 11 Frame synchronization circuit 12 Time extender 13 Communication control Circuit 14 Switch 15 Codec 16 Telephone 17 Speaker 18, 21, 24 Control / Broadcast Channel 19, 22 Control Slot 20 FM Broadcast Slot 23 Broadcast Slot 25, 70 Communication Channel 26, 81 Transmitter 27, 75 Receiver 28 Multiplexer 29 Broadcast Equipment 30 Channel control processor 31 Uplink control channel 32, 52 Radio base station 33-39, 61-67 Mobile station 40, 74 Antenna 41 Transmitter 42 Receiver 43 Modulation / demodulation circuit 44 Channel switching Circuit 45 call disconnection signal transmission circuit 46 call disconnection monitoring circuit 47 broadcast mode switching circuit 48 broadcast switching request receiving circuit 49 loudspeaker 50 call current request circuit 51 PB telephone 53 wireless repeater 54 broadcast wireless channel allocating device 55 switching center 56 communication path switch 57 central processing unit 58 broadcast recording device 59 output device 60 storage device 68 control channel 69 broadcast channel 72 time division processing circuit 73 circulator 76 demodulator 77 reception signal converter 78 communication terminal 79 transmission signal converter 80 modulation Container 82 timing circuit 83 duplexer

Claims (8)

(57) [Claims] 1. A wireless channel is set between a plurality of mobile stations and one wireless base station, the wireless channel including a control channel and a plurality of communication channels in its frequency band,
The mobile station and the radio base station select a communication channel designated according to a predetermined control procedure via the control channel, and perform communication between one mobile station and the radio base station using the communication channel. Providing a broadcast channel on the wireless line, wherein the mobile station and the wireless base station specify a plurality of mobile stations in a broadcast mode via the control channel; A station for simultaneously receiving a broadcast transmitted by the base station to the broadcast channel, wherein the frequency of the broadcast channel is equal to the frequency of the control channel.
The frequency is repeated every fixed period T
A radio communication broadcasting system characterized by being assigned to channels . 2. The radio communication broadcasting system according to claim 1, wherein said T is 23,809 μS. 3. The broadcast channel signal is a time-compressed signal, the radio base station is provided with means for time-compressing a signal to be broadcast, and the mobile station is provided with a signal received from the broadcast channel. wireless Telecommunications system according to claim 1 or 2 comprising means for band extension a. 4. The control channel frequency is divided into control slots and broadcast channels in a time-division manner.
Wireless Telecommunications system according to the the control slot transmitted control signal as a QPSK signal, any one of claims 1 to 3 in its broadcast channel FM signal is transmitted. 5. The frequency of the control channel is time-divided into a control slot and a broadcast channel, and a control signal is transmitted as a QPSK signal in the control slot, and a QPSK signal is transmitted in the broadcast channel. The wireless communication broadcasting system according to claim 1. Wherein said mobile station includes a radio communication broadcast system according to any one of claims 1 comprising means for outputting to the speaker as an audio signal a signal received from the broadcast channel 5. 7. The mobile station automatically releases the broadcast mode and responds to the call signal when the mobile station detects a call signal of the own station in a control slot of the control channel while receiving the broadcast channel. claims 1 comprises means 6
The wireless communication broadcasting system according to any one of the above. 8. A means for displaying an alarm when a call signal of the mobile station is detected in a control slot of the control channel while receiving the broadcast channel, and an operation performed after the alarm display. The wireless communication broadcasting system according to any one of claims 1 to 7, further comprising: means for canceling the broadcast mode in response to the input and responding to the call signal.