JPH1169437A - Portable telephone system provided with broadcasting channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of a complicated connection processing and to easily receive information by providing a broadcasting channel transmission means in a base station and a broadcasting channel, reception means in a mobile station, making the broadcasting channel transmission means perform transmission at all times regardless of connection with the mobile station and making the broadcasting channel reception means perform reception without performing a connection procedure with the base station. SOLUTION: In the initial operation of the mobile station, the respective mobile stations capable of receiving a broadcasting channel search a pilot channel sent out by the base station at all times when power is supplied. The mobile station 14 closest to the base station 4 matches a code phase with the pilot signal of the base station 4 and receives a synchronization channel. Then, after performing synchronization to the system time of the base station 4, an access channel is transmitted and a registration processing to the base station 4 is performed. For that, the base station 4 reports the reception of registration to the mobile station 14. The state is a standby state and the mobile station 14 performs call origination and call, termination at any time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone system having at least a base station and a mobile station and performing communication between the two stations using a radio channel including a communication channel and a control channel. The present invention relates to a mobile phone system having a broadcast channel in which a base station is provided with broadcast channel transmitting means and a mobile station is provided with broadcast channel receiving means.

[0002]

2. Description of the Related Art A general portable telephone system has at least a base station and a mobile station, and communicates between the two stations using a radio channel including a communication channel and a control channel, and has a plurality of base stations. In such a case, a control station for controlling all the base stations is provided, and the mobile station is provided with a function of registering the location of the mobile station and exchanging with another telephone line. In particular, CDMA
As a mobile phone system using the Code Division Multiple Access (Code Division Multiple Access) system, US TIA (Telecommunication
The IS-95 standard defined by the Industry Association) is known.

[0003] In this technique, a base station and a mobile station are connected by a code spreading method, and the control channel includes a control channel for controlling connection between the mobile station and the base station, and a communication channel mainly for transmitting and receiving a communication signal. . The control channel of the base station is
There are a pilot channel, a synchronization channel, and a paging channel. The mobile station specifies the base station with the pilot channel, controls the phase of the spreading code, detects the received power, and the like, and transmits the base station using the synchronization channel. Synchronous control is performed according to the standard time that comes.
Also, call control such as calling from the base station is performed by the paging channel. On the other hand, the control channel of the mobile station is only the access channel, and performs call control such as registration with the base station and outgoing / incoming calls.

Although the radio band from the base station to the mobile station is different from the radio band from the mobile station to the base station, a control channel and a communication channel from the base station to the mobile station, or a control channel from the mobile station to the base station. The same radio band is used for each and the communication channel, and the same band is used even when a plurality of mobile stations exist. Further, a control channel from the base station to each mobile station is common, and a spread code is used in which only a speech channel differs for each mobile station.

When making a call, the mobile station detects a pilot channel from the base station in advance, searches for the base station having the highest reception level, receives the synchronization channel, and synchronizes it. Register the ID address in the base station. In this standby state, when a call is made to the mobile station, the mobile station is called by the paging channel, and the mobile station responds by the access channel, and can make a call by specifying the communication channel to be used. Conversely, when making a call from the mobile station, the telephone number of the call destination is transmitted to the base station through the access channel, the call is connected to the call destination, and the call can be made through the call channel specified by the base station.

[0006] In addition to the above, according to the conventional technique, in order to improve the number of mobile stations to be accommodated and the communication quality, the transmission power of the mobile stations is set so that the reception level of each mobile station at the base station becomes the same. Power control technology for sequentially controlling the CDMA system has been used, and various devices have been devised to realize a mobile phone system based on the CDMA system.

[0007]

However, in the case of the prior art, if a service for transmitting information in one direction from the base station to the mobile station is to be provided, the mobile station and the base station need to communicate with each other in the same manner as in a normal call. A complicated connection process using a control channel had to be performed with the station. In addition, there is a problem that a communication channel from the mobile station to the base station is occupied despite the one-way communication from the base station to the mobile station. Further, even when a plurality of mobile stations receive the same information, the base station has to establish and transmit a communication channel individually to each mobile station.

Therefore, an object of the present invention is to provide a mobile station that transmits information in one direction from a base station to a mobile station without performing complicated connection processing such as registration with the base station. It is to provide a mobile phone system capable of receiving information.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has at least a base station and a mobile station, and performs communication between the two stations using a radio channel including a communication channel and a control channel. In a portable telephone system, a base station is provided with a broadcast channel transmitting means, and a mobile station is provided with a broadcast channel receiving means. The broadcast channel transmitting means always transmits regardless of the connection with the mobile station. It is configured so that it can be received at any time without performing a connection procedure. In particular, the modulation method is based on code spreading, the communication channel is modulated using a different spreading code for each mobile station, the broadcast channel is modulated with a predetermined second spreading code, and the broadcast channel receiving means is: The information transmitted by the broadcast channel is demodulated by despreading with the second spreading code.

[0010] The code for spreading the broadcast channel is:
Modulation is performed using a spreading code registered only for a specific number of mobile stations, so that only mobile stations despread with this spreading code can receive a broadcast channel.

Further, the base station is provided with storage means for storing information broadcast from the broadcast channel in advance, and the broadcast channel transmitting means repeatedly reads the information stored in the storage means and transmits the information from the broadcast channel.

[0012] Further, the mobile station is provided with storage means for storing information received via a broadcast channel, and display / reproduction means for displaying or reproducing the contents stored in the storage means. The information is repeatedly read out and displayed or reproduced on the display / reproduction means.

Further, a base station control station for controlling n (n is a natural number) base stations is provided.
Is a natural number, and the first broadcast information is transmitted to m <n) base stations, and the second broadcast information is transmitted to k (k is a natural number, k <n and k = nm) base stations. Transmission is controlled so that different information can be transmitted for each area.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. Here, the mobile phone system of the present invention uses a CDMA (Code Division Malutiple Access) system, and multiplexes a plurality of channels by spreading a signal to be transmitted using a code having no correlation over a wide band. Is available.

Further, the portable telephone system of the present invention is provided with a broadcast channel for performing one-way transmission from the base station to the mobile station. The broadcast channel is spread by a code different from that of the speech channel and communicates with the base station like the speech channel. A mobile phone system having a broadcast channel, which can demodulate a modulated signal of a base station without performing the complicated connection procedure described above.

FIG. 1 is an explanatory diagram showing the overall configuration of a portable telephone system having a broadcast channel according to a first embodiment of the present invention. In FIG. 1, 1 is a base station control station, 3 is a general telephone network, 4, 5, and 6 are base stations controlled by the base station control station 1, 9, 10, 11, and 12 are general telephone networks. Connected telephones, 13, 14, 15, 1
6 is a mobile station, 17 is a broadcasting station for providing information, and is connected to the base station control station 1 via a dedicated telephone line 18.

The operation of each section in FIG. 1 will be described. The base station control station 1 performs overall control of a plurality of base stations, operates as an exchange for controlling transmission and reception between a telephone connected to the general telephone network 3 and a mobile station, and performs diversity control between base stations. It also performs handoff control and the like.
In the case of the present embodiment, the three base stations of the base station 4, the base station 5, and the base station 6 are integrally controlled, and the connection between telephones and mobile stations connected to the general telephone network 3 is exchanged and controlled. The information transmitted from the broadcasting station 17 via the dedicated telephone line 18 is transmitted to the base station 4, the base station 5, and the base station 6.
And send it through a broadcast channel.

The base station 4 is controlled by the base station control station 1, and has a control channel, a communication channel, and a broadcast channel classified according to functions. As will be described later in detail, registration and outgoing / incoming processing of the mobile station are performed by the control channel, and the communication voice is transmitted to and received from the mobile station by the communication channel. In addition, information provided by the broadcast station 17 via a broadcast channel, which is a feature of the present embodiment, is transmitted to an unspecified number of mobile stations. The base station 5 and the base station 6 operate similarly to the base station 4.

The telephone 9, telephone 10, telephone 11 and telephone 12 are telephones connected to the ordinary general telephone line network 3.

The mobile station 13 is capable of performing location registration and outgoing / incoming / outgoing control using a control channel and talking on a call channel, similarly to a general mobile phone.

The basic operation of the mobile station 14 is as follows.
Is the same as that described above, except that one difference is that signals transmitted from the base station 4, the base station 5, and the base station 6 via the broadcast channel can be received. It is. Similarly to the mobile station 14, the mobile stations 15 and 16 can receive broadcast channels.

The broadcast station 17 transmits an audio signal like an existing radio broadcast, an audio signal and an image signal like an existing television broadcast, or a data signal known in a text broadcast or the like to a dedicated telephone line. 18 to the base station control station 1.

The main equipment constituting the portable telephone system having the broadcast channel of the present embodiment has been described above.

Next, the configuration and operation of each facility will be described in detail. First, regarding the configuration of the base station control station 1,
This will be described with reference to FIG. 2, reference numeral 301 denotes a telephone line interface unit, 302 denotes a vocoder unit, 303 denotes a base station interface unit, 304 denotes an exchange, 305 denotes a control unit, 306 denotes a connection line to the general telephone line network 3, and 307 denotes a connection line.
Is a connection line to the dedicated telephone line 18.

The telephone line interface unit 301 inputs and outputs control information such as a telephone number transmitted from the general telephone line network 3 via the connection line 306 and a communication signal with a corresponding mobile station via the exchange 304. I do. Also, it outputs information sent from the dedicated telephone line 18 to the control unit 305.

The base station interface unit 303 connects the exchange 304 to the base station 4 or the base station 5 or the base station 6 via a connection line according to a command from the control unit 305.

The switch 304 operates to output the input call signal to a corresponding output destination in response to a command from the control unit 305, similarly to a switch of a normal telephone line network.

The control unit 305 controls each unit in the base station control station 1, and controls the telephone line interface unit 3.
01, transmit and receive various control signals via the base station interface unit 303.

The vocoder unit 302 is a voice coding / decoding device for compressing / decompressing voice, and each base station and the base station control station 1
The audio signal is input and output via the base station interface unit 303 as compressed data.

The connection lines 306 and 307 are capable of transmitting and receiving a plurality of signals using a copper wire, an optical fiber, or wirelessly, and input and output a control signal and a call signal. In general, in a telephone line network, control information such as a telephone number is performed using a common line different from a path of a call signal. However, in the present embodiment, the description is simplified and described in the form of a connection line. I have.

Next, the operation of the base station control station 1 will be described. The control unit 305 includes the base station interface unit 30
3 and the mobile stations connected to each base station are grasped. When a call is received from the general telephone line network 3 via the telephone line interface unit 301, the mobile station is disconnected from the base station. When the call and the mobile station answer,
Establish a telephone call with a general telephone line, and make a call between the mobile station and a telephone connected to the general telephone line via the exchange 304, the vocoder unit 302, and the base station interface unit 303. Control to be able to.

Broadcast information sent from the dedicated telephone line 18 is input to the control unit 305 via the connection line 307 and the telephone line interface unit 301, and is transmitted to each base station via the base station interface unit 303. Is sent to the broadcast channel transmitting unit.

Next, the configuration of the base station 4 will be described in detail with reference to FIG. The base station 4 is a facility for transmitting and receiving a control signal and a call signal to and from a mobile station, or transmitting a broadcast signal by a control signal transmitted from the base station control station 1.

In FIG. 3, reference numeral 401 denotes a receiving antenna;
07 is a transmitting antenna, 950 is a transmitting unit, 951 is a receiving unit, 952 is a base station control unit, 953 is a base station control station interface unit, 954 is a GPS receiving unit, and 955 is GP.
The S antenna, 505 is an adder, 506 is an analog modulator, and 509 is a baseband modulated signal from another transmitter.

Next, the operation of the base station 4 will be described.
Modulated signals of a plurality of mobile stations received by receiving antenna 401 enter receiving section 951 and are also sent to other receiving sections. The control signal demodulated by the receiving section 951 is input to the base station control section 952, and the speech signal is transmitted through the base station control station interface section 953 while being voice-encoded.
It is sent to the base station control station 1.

Conversely, the control signal transmitted from the base station control station 1 is input to the base station control section 952, and the encoded voice data is input to the transmission section 950.

The transmission section 950 is controlled by the base station control section 952, and transmits a pilot signal serving as a reference when the mobile station receives the signal, a synchronization signal for obtaining synchronization, a paging signal for performing a call, etc., respectively. , And further transmits a speech coded signal transmitted from the base station control station 1 via the base station control station interface unit 953 through the communication channel.

The transmission signal of each channel is added to an adder 505
After being sent to the mobile station and added thereto, the signal is modulated into a high-frequency signal by the analog modulation section 506 and transmitted from the transmission antenna 507 to the mobile station. In addition, a signal 509 output from another transmitting unit is also input to the adding unit 505, added, modulated by the analog modulating unit 506, and transmitted from the transmitting antenna 507.

Next, the receiving section 951 of the base station will be described with reference to FIG. In FIG. 5, 401 is a receiving antenna, 402 is an analog demodulator, 403 is a digital demodulator, 404 is a digital demodulator, 405 is a searcher unit,
406 is a control unit, and 408 is a decoder unit.

The analog demodulation unit 402 includes a receiving antenna 4
01, is converted into an intermediate frequency, demodulated into an analog baseband signal, A / D converted, a digital demodulation unit 403, another digital demodulation unit 404, and a searcher unit 405. And output to

The digital demodulation unit 403 despreads and demodulates the A / D converted and code spread baseband signal output from the analog demodulation unit 402. Digital demodulation unit 4
04 is demodulated in the same manner, and digital demodulation units 403 and 40
The signal demodulated in 4 is output to the decoder unit 408. At the time of demodulation, demodulation is performed in synchronization with the synchronization information output by control unit 406. This part will be described later in detail.

The searcher unit 405 includes an analog demodulation unit 4
02 scans the A / D-converted baseband signal in the time domain, and determines the cycle timing of the spread code by the control unit 406.
, And the control unit 406 notifies the digital demodulation units 403 and 404 of the timing, whereby the digital demodulation units 403 and 404 can adjust the timing of the despreading of the received signal.

The control section 406 obtains the timing of despreading based on the information output from the searcher section 405 and notifies the digital demodulation sections 403 and 404 of the timing. This timing is also transmitted to the decoder unit 408, and is used for timing adjustment at the time of decoding.

Decoder section 408 deinterleaves the interleaving process performed by the mobile station during transmission, performs Viterbi decoding, and sends the result to base station controller 1.

Although FIG. 3 shows only one transmitting unit and one receiving unit for one base station in order to make the explanation easy to understand, a plurality of mobile stations are actually connected by one base station. Therefore, it is clear that a plurality of transmitting units and receiving units are required.

Also, in the portable telephone system of the present embodiment, it is necessary to determine the phase on the time axis of the reference signal for each base station, as is conventionally known, and the phase of the reference signal is determined using the GPS reference time. Have decided. Where GP
S will be briefly described. GPS is Global Positio
This is a system that transmits standard time information from multiple satellites whose positions are known in advance and provides ground position information based on the time difference between arrivals.

In FIG. 3, a GPS antenna 955 is
A modulated signal sent from an artificial satellite is received and output to a GPS receiver 954. The GPS receiver 954 transmits the standard time information sent from the artificial satellite to the base station controller 95.
Output to 2. The base station control unit 952 uses this information to adjust the phase on the time axis of the transmission signal to the mobile station, and controls the timing of the code cycle when the transmission unit 950 performs code spreading.

Next, the transmitter 95 of the base station 4 will be described with reference to FIG.
0 will be described. In FIG. 4, reference numeral 502 denotes a control unit,
Reference numeral 503 denotes a control channel modulator, 504 denotes a communication channel modulator, and 508 denotes a broadcast channel modulator.

505 is an adder, 506 is an analog modulator, and 507 is a transmission antenna. The adder 505 adds code spread modulated signals 509 output from the transmitter 950 and other transmitters. The signal is modulated into a high-frequency signal by an analog modulation unit 506 and transmitted from a transmission antenna 507 to a plurality of mobile stations.

The control section 502 checks the control information output from the base station control section 952, and controls the control channel modulation section 503.
And a communication channel modulator 504 and a broadcast channel modulator 508.

The control channel modulator 503 includes a controller 5
02, and initializes control channels such as a pilot channel, a synchronization channel, and a paging channel with a code phase instructed by the control unit 502, and performs spreading with a specified Walsh code among 64 types of Walsh codes. .

Here, the Walsh code is shown in FIG.
5 will be briefly described. FIG. 15A shows the matrix divided into four blocks. The upper left is named A block, the upper right is named B block, the lower left is named C block, and the lower right is named D block. FIG.
(B) shows a basic matrix of 2 × 2 Walsh codes, where A, B and C blocks are “0” and D
Each block has an inverted value "1" of another block. FIG.
(C) is a combination of four Walsh code basic matrices to form a 4 × 4 Walsh code. The A, B, and C blocks contain the basic matrix of FIG. Each block contains an inverted value of another block. In this way, n × n (n
Is an even natural number), and it is known that these codes are orthogonal to each other. In the present embodiment, 64 Walsh codes when n = 64 are used.

Next, the configuration of control channel modulation section 503 in transmitting section 950 of FIG. 4 will be described with reference to FIG. In FIG. 6, reference numeral 601 denotes a Walsh code generation unit of No. 0, 602 denotes a Walsh code generation unit of No. 32,
603 is the first Walsh code generator, 605 and 60
6, 610 are exclusive OR (ExOR), 607 is an encoder section of a synchronization channel, 608 is an encoder section of a paging channel, 609 is a long PN code generation section,
611 is a short PN code generator for performing in-phase (I-channel) spread modulation of quadrature modulation, and 612 is a quadrature (Q
Short PN code generators 613, 614, and 615 for performing spread modulation of channels (channels);
Reference numerals 6, 617, 618, 619, 620, and 621 denote D / A converters for converting a digital modulation signal output from the quadrature modulator into an analog signal.

Next, the operation of the control channel modulator 503 will be described. The pilot channel code is 0
Since the exclusive Walsh of the number Walsh code and the code string of “0” is always calculated, the code string output to the orthogonal modulation unit 613 is the Walsh code number 0 itself generated by the Walsh code generation unit 601. . Further, since all the Walsh codes are “0”, the quadrature modulator 6
The signal output from the channel 13 is the short PN code string of the I channel, and the Q channel is the Q
This is the short PN code sequence of the channel itself.

The code of the synchronization channel is the 32nd Walsh code generated by the Walsh code generation section 602 and the synchronization information output by the control section 502.
07 and the code string encoded by the EXOR gate 60
The ExOR is taken at 5 and output to the quadrature modulator 614. Here, in the Walsh code No. 32, “0” is 3
After two continuations, a code pattern in which 32 "1s" continue and 32 "0s" continue is repeated, so that the Walsh code can be easily synchronized on the mobile station side.

The code of the paging channel is determined by the control unit 5.
02, a code string obtained by encoding the paging information output by the encoder unit 608, and a code string generated by the long PN code generation unit 609 according to the setting value of the control unit 502.
ExOR is taken by ExOR gate 610. further,
ExOR is obtained by the ExOR 606 and the first Walsh code generated by the Walsh code generator 603, and output to the quadrature modulator 615.

Here, the long PN code generation section 609 includes:
A long PN code is generated by a 42-tap generating polynomial. The tap mask information is set to a predetermined value by the control unit 502.

I channel short PN code generator 61
1 and Q channel short PN code generating section 612
Is a generator polynomial that generates a code having a length of 15 to the power of 1, generating different mutually orthogonal PN codes.

The quadrature modulators 613, 614 and 615
Are spread by the short PN code generation section 611 and the short PN code generation section 612, output to the respective D / A conversion sections, and then output to the addition section 505.

Next, the communication channel modulator 504 in the transmitter 950 of FIG. 4 will be described with reference to FIG.
In FIG. 7, reference numeral 701 denotes a Walsh code generation unit;
2 is an encoder, 703 is a long PN code generator, 7
04 and 705 are ExOR gates, 706 is a quadrature modulator,
707 and 708 are D / A conversion units.

The Walsh code generating section 701 generates a Walsh code excluding the Walsh codes 0, 32 and 1 out of the 64 Walsh codes in accordance with a command from the control section 502 and outputs the generated Walsh code to the ExOR gate 705. .

The encoder unit 702 performs convolutional coding of transmission information and repetition (repetition) of codes in order to cope with code errors.
Output to

The long PN code generation unit 703 is a mobile station specific PN code generated by the mobile station ID and the like.
It has a length of 2 42 -1. The mobile station ID is
The control unit 502 sets the generated polynomial as tap mask information. The control unit 502 receives the ID of the mobile station at the time of the registration processing of the mobile station to the base station, and generates tap mask information based on the ID.

ExOR gates 704 and 705 are
This is a logic gate that takes an exclusive OR of inputs.

The quadrature modulation section 706 outputs an in-phase (I
ExOR gate 705 outputs the short PN code output from short PN code generation section 611 for performing spread modulation of (channel) and short PN code code generation section 612 for performing orthogonal (Q channel) spread modulation. The D / A conversion unit 7 further spreads the spreading code to be processed and passes through a low-pass filter (roll-off filter) for waveform shaping.
07 and 708.

The D / A converters 707 and 708 convert the digital signal output from the quadrature modulator 706 into an analog signal and output the analog signal to the adder 505.

Next, the broadcast channel modulator 508 in the transmitter 950 of FIG. 4 will be described with reference to FIG. 8, reference numeral 801 denotes a Walsh code generation unit;
802 is an encoder unit, 805 is an ExOR gate, 80
Reference numeral 6 denotes a quadrature modulator, and 807 and 808 denote D / A converters.

The Walsh code generating section 801 generates the 63rd Walsh code out of the 64 Walsh codes in accordance with a command from the control section 502 and outputs it to the ExOR gate 805.

The encoder unit 802 performs convolutional coding of transmission information and repetition (repetition) of codes to cope with code errors, and performs an ExOR gate 805
Output to

The ExOR gate 805 receives two inputs from the Walsh code generator 801 and the encoder 802,
Take the exclusive OR.

The quadrature modulation section 806 has the same phase (I
ExOR gate 805 outputs the short PN code output from short PN code generation section 611 for performing spread modulation of channel (channel) and short PN code generation section 612 for performing spread modulation of orthogonal (Q channel). The spread code is further spread and output through a low-pass filter (roll-off filter) for waveform shaping. The spread code of the I channel is output to the D / A converter 807, and the spread code of the Q channel is output to the D / A converter 808.

D / A conversion sections 807 and 808 convert the digital signal output from quadrature modulation section 806 into an analog signal and output it to addition section 505.

Next, the configuration of the mobile station will be described.
FIG. 10 is an explanatory diagram showing the configuration of the mobile station 14 (or 15 or 16) that can receive a broadcast channel. FIG.
At 0, 950 is an antenna, 951 is an analog modulation / demodulation unit, 952 is a digital demodulation unit, 953 is a digital modulation unit, 954 is a speech decoding unit, 955 is a speech encoding unit, 9
56 is an audio input / output unit, 957 is a microphone, 958 is a speaker, 959 is a broadcast reception button, 960 is an operation unit, 961
Denotes a control unit, and 962 denotes a power supply unit.

The antenna 950 is connected to the analog modulation / demodulation unit 95.
1 transmits the high-frequency signal output from the base station 1, and outputs the received high-frequency signal to the analog modulation / demodulation unit 951.

The analog modulation / demodulation unit 951 separates a high-frequency transmission signal and a reception signal by a filter circuit, and the high-frequency reception signal is once converted to an intermediate frequency, amplified, and then demodulated into a baseband signal. The demodulated baseband signal is output to digital demodulation section 952.
Conversely, the baseband signal output from the digital modulation section 953 is modulated by the analog modulation / demodulation section 951 into a high-frequency signal. The signal modulated to a high frequency is transmitted from the antenna 950 via the power amplifier.

The digital modulation section 953 code-spreads the audio information output from the control section 961,
51. The operation of this portion will be described later in detail.

Digital demodulation section 952 despreads the baseband reception signal output from analog modulation / demodulation section 951 with a predetermined code, demodulates the received information, and outputs it to control section 961. The operation of this portion will also be described later in detail.

The audio encoding unit 955 includes an audio input / output unit 95
The digital audio data output from the digital audio data 6 is compression-encoded by a predetermined method and output to the control unit 961.

The audio decoding unit 954 receives the demodulated audio compressed data output from the control unit 961, performs decompression processing, decodes the digital audio signal into a digital audio signal, and outputs the audio input / output unit 956.
Output to

The microphone 957 converts the sound into an electric signal and outputs the electric signal to the sound input / output unit 956. Speaker 958
Converts the electric signal output from the audio input / output unit 956 into sound and outputs the sound.

A broadcast reception button 959 is an operation button for starting reception of a broadcast channel broadcast by the base station.

The operation unit 960 has operation buttons such as a dial button and a call button, a power switch, and a display panel, which are provided in a general mobile phone mobile station other than the broadcast reception button 959. , And input / output to / from the control unit 961 for processing.

The control section 961 controls the operation of each section of the mobile station and also processes voice data and control data.

The power supply section 962 is a rechargeable battery and supplies operation power to each section of the mobile station.

Next, the digital modulation section 953 of FIG. 10 will be described with reference to FIG. In FIG. 11, 97
0 is an encoder unit, 971 is a Walsh code modulation unit,
972, a long PN code generator, 973, a short PN code generator for I channel, 974, a short PN code generator for Q channel, 975, an ExOR gate, 97
Reference numeral 6 denotes a quadrature modulator, 977 denotes an I-channel D / A converter, and 978 denotes a Q-channel D / A converter.

The encoder 970 performs convolutional coding with 9 taps and a rate of 1/3 or block interleaving for error correction during communication, and outputs the result to the Walsh code modulator 971.

The Walsh code modulation section 971 divides the code string output from the encoder section 970 into 6-bit units and converts them into 64 types of Walsh codes.

The long PN code generation section 972 calculates 2
A long PN code having a length of the power of -1 is generated and output to the ExOR gate 975.

An ExOR gate 975 is a gate for taking an exclusive OR of two inputs, and is a Walsh code modulator 971
And the code string output by the long PN code generation section 972 are subjected to an exclusive OR operation, and the orthogonal modulation section 9
76.

Short PN code generator 9 for I channel
73 generates a short PN code having a length of 2 15 -1 and outputs the short PN code to the quadrature modulation unit 976.

Short PN code generator 9 for Q channel
74 generates a short PN code having a length of 2 15 -1 which is not correlated with the short PN code for the I channel, and outputs the short PN code to the quadrature modulation unit 976.

The quadrature modulator 976 is provided with an ExOR gate 97.
5 is output to the short PN code string output from the PN code generation unit 973 for the I channel or the short P code output from the PN code generation unit 974 for the Q channel.
The code sequence modulated by the N code sequence is output to the D / A conversion unit 977, and the spread modulated code sequence of the I channel is output to the D / A conversion unit 978, respectively. The signal is converted into an analog signal and output to the analog modulation / demodulation unit 951.

Here, the encoder 970, the long PN
The code generator 972, the short PN code generator 973 for the I channel, and the short PN code generator 974 for the Q channel synchronize the code phases according to a command from the controller 961. Further, the control section 961 can set a code pattern generated by the long PN code generation section 972. The control unit 961 stores an address assigned to each mobile station, determines a generating polynomial mask pattern for generating a long PN code based on the address, and sends the generated pattern to the long PN code generating unit 972. Set. As a result, a different spreading code is generated for each mobile station, so that the base station can determine and receive a signal of a specific mobile station.

In the actual operation, when modulating control information and when modulating voice information, the mask pattern at the time of code generation is changed, and the base station is addressed to the control channel modulated with a predetermined mask pattern. When the base station receives the communication channel of the mobile station, the base station generates a PN code for demodulation based on this address and receives the communication channel of the mobile station.

Further, in order to obtain synchronization at the time of reception at the base station, the signals are spread again by short PN codes having no correlation with each other, and are orthogonally modulated and transmitted.

As described above, the digital modulation section 953 code-spreads the audio encoded information output from the audio encoding section 955 and the control information output from the control section 961 to convert them into analog baseband signals. The signal is output to the analog modulation / demodulation unit 951.

Next, the digital demodulation unit 952 in FIG. 10 will be described with reference to FIG. In FIG. 12, 85
0 and 856 are A / D converters, 851 is a demodulator, 852 is a demodulator, 853 is a searcher, 854 is a diversity, and 855 is a decoder.

The A / D converter 850 converts the analog I-channel baseband signal output from the analog modulator / demodulator 951 into a digital signal.

The A / D converter 856 converts the analog Q channel baseband signal output from the analog modulator / demodulator 951 to a digital signal.

[0100] Demodulation section 851 despreads the received baseband digital signal and outputs the result to diversity section 854.

Here, the demodulation section 851 will be described with reference to FIG. 13, 870 is a despread demodulator, 871 is an I-channel accumulator, 872 is a Q-channel accumulator, 873 is a phase controller,
874 is a short PN code generator for I channel, 87
5 is a Q channel short PN code generator, 876 is a Walsh code generator, 877 is a long PN code generator, and 878, 879, 880, and 881 are ExOR gates.

The despread demodulation section 870 includes an A / D conversion section 85
By despreading the baseband digital signals input from 0 and 856 and the decoded code sequence for the I channel input from the ExOR gate 878 or the decoded code sequence for the Q channel input from the ExOR gate 879,
It outputs to the accumulator 871 for I channel and the accumulator 872 for Q channel.

The accumulator 871 includes a despreading unit 870
Output the I-channel despread code sequence output to the phase control unit 873 by averaging one symbol period.

The accumulator 872 includes a despreading unit 870
The average of the Q channel despread code sequence output by the symbol period is output to the phase control unit 873.

The phase control section 873 includes an accumulator 87
1 and the output phase of accumulator 872 to match the received data to output to diversity section 854.

Short PN code generator for I channel 8
Numeral 74 generates a short PN code sequence of the same I channel used by the base station at the time of code spreading.

Short PN code generator for Q channel 8
75 generates a short PN code sequence of the same Q channel used by the base station at the time of code spreading.

[0108] Walsh code generating section 876 generates a Walsh code having the number specified by control section 961.

The long PN code generation section 877 calculates 2
The code of the pattern specified by the control unit 961 out of the code length of the power −1 is generated.

ExOR gates 878, 879, 880 and 881 are gates that take exclusive OR of two inputs.

As described above, demodulation section 851 obtains I-channel and Q-channel reception code strings by despreading with the orthogonal code string used by the base station at the time of spreading modulation.
After filtering by the accumulator, phase control is performed, and the received code is output to diversity section 854.

Referring to FIG. 12, demodulation section 852 has the same configuration and operates in the same manner as demodulation section 851 described above, but demodulates a signal received with a time delay by multipath or the like to second demodulation section 852. And demodulation, and the addition can be performed by the diversity section 854 to increase the reception sensitivity.

Next, the operation for receiving a broadcast channel will be described. In FIG. 10, when the mobile station is not in the registered state, when the broadcast reception button 959 is pressed, the power of the power supply unit 962 is turned on via the operation unit 960, and each unit of the mobile station starts operating. At this time, the control unit 961 can know via the operation unit 960 that the broadcast reception button 959 has been pressed, and does not start the registration operation to the base station as when a normal call is made. This operation is completely different from the conventional mobile phone system.

First, in FIG.
3 searches for the pilot signal of the nearest base station and notifies the control unit 961 of the phase information. Control unit 961
Is transmitted to the Walsh code generator 876 of the demodulator 851,
A Walsh code 63 for a broadcast channel is set. Further, it instructs the long PN code generation section 877 to output all “0”, which means that the generation of the long PN code is effectively turned off. by this,
The despreading demodulation unit 870 can demodulate the signal of the broadcast channel, and is input to the phase control unit 873 via the accumulators 871 and 872 and is synthesized as in the case of receiving the signal of the communication channel. Output to diversity section 854.

Similarly, demodulation section 852 also receives the broadcast channel of the base station in synchronization with the pilot signal of the second highest reception level,
4 is output.

In the diversity section 854, the demodulation section 85
1 and the broadcast channel signal output by the demodulation unit 852 are added to increase the reception sensitivity and output to the encoder unit 855. The encoder unit 855 deinterleaves or Viterbi-decodes the data sequence output from the diversity unit 854, demodulates the encoded audio data, and outputs it to the audio decoding unit 954.

[0117] Then, the audio signal is decoded into a digital audio signal by the audio decoding unit 954, is converted into an analog audio signal by the audio input / output unit 956, and is transmitted from the speaker 958 via the broadcast channel from the base station. The broadcast sound is reproduced and can be heard.

Further, during reception of the broadcast channel, control section 961 controls digital modulation section 953 and analog modulation / demodulation section 9.
The power of the transmitting unit 51 is controlled to be turned off.

As described above, when receiving a signal on a broadcast channel, a mobile station needs to perform registration with a base station and establish a call using a control channel, unlike receiving a signal on a communication channel. There is no power consumption for transmission.

Next, the operation flow of the portable telephone system having a broadcast channel according to the present embodiment will be described with reference to FIG.

First, the initial operation of the mobile station will be described. The mobile station 14, the mobile station 15, and the mobile station 16 are mobile stations that can receive a broadcast channel.
3 is a mobile station for ordinary calls only.
When the power is turned on, the base station searches for a pilot channel that is constantly transmitting.

For example, when the power of the mobile station 14 is turned on, the pilot channel is scanned on the time axis, and the code phase is adjusted to the pilot signal having the highest reception level.
In FIG. 1, since the mobile station 14 is closest to the base station 4,
The code phase is adjusted to the pilot signal of the base station 4. Next, the mobile station 14 receives the synchronization channel of the base station 4,
After synchronizing with the system time of the base station 4, the access channel is transmitted, and the registration processing with the base station 4 is performed.
On the other hand, the base station 4 informs the mobile station 14 that the registration has been accepted through the access channel. This state is a standby state, and the mobile station 14 can make and receive calls at any time.

Next, the operation when the mobile station 14 makes a call will be described. When the mobile station 14 presses the dial button to make a call to the telephone 10 connected to the general telephone line, the information of the call is transmitted to the base station 4 via the access channel and further transmitted to the base station control station 1. The base station control station 1 informs the general telephone network 3 that the dial of the telephone 10 has been pressed, and
Calls the telephone 10 in the same manner as a normal telephone call.
When the telephone 10 answers, although not shown in the figure,
The telephone 10 and the mobile station 14 are connected via the exchange of the general telephone line network 3 and the exchange 304 and the base station 4 of the base station control station 1 to establish a talking state. The voice signal of the telephone 10 is encoded into digital voice in the base station control station 1, code-spread modulated by the base station 4, and sent to the mobile station 14. The mobile station 14 despreads the data, demodulates the data into voice-encoded data, performs voice decoding, and reproduces the data as analog voice signals from a speaker. Conversely, the voice signal input from the microphone of the mobile station 14 is voice-coded, spread-modulated, and transmitted to the base station 4. The base station 4 despreads and demodulates the encoded voice data to output to the base station control station 1. The base station control station 1 performs a voice decoding process to decode the voice signal into a voice signal, and the voice signal is transmitted to the telephone set 10 via the exchange of the general telephone network 3.

Next, the operation when the mobile station 16 receives a call from the telephone 12 will be described. When the telephone 12 goes off-hook and turns the dial number of the mobile station 16, the general telephone network 3 informs the base station control station 1 that the mobile station 16 is being called. The base station control station 1 checks whether or not the mobile station 16 corresponding to the control range of each base station is registered. If the mobile station 16 is registered, the mobile station 16 uses the paging channel of the registered base station. 16
Call.

Now, assuming that the base station closest to the mobile station 16 is the base station 6, the mobile station 1 receives a call command transmitted through the paging channel of the base station 6.
Ring the ringing tone of 6. When the user of the mobile station 16 goes off-hook on the mobile station 16 and responds to the paging signal, the response is sent to the base station 6 through the access channel, and the base station 6 is assigned a traffic channel. The Walsh code generator 876 of the demodulator 851 sets the Walsh code of the assigned communication channel. Thus, mobile station 1
A communication channel is established between the mobile station 16 and the base station 6, and the mobile station 16 is connected to the general telephone network 3 via the base station 6 and the base station control station 1, and can communicate with the telephone 12.

Next, the broadcast reception button 959 of the mobile station 15
The operation when is pressed will be described. When the broadcast reception button 959 is pressed, the mobile station 15 searches for the pilot channel of the nearest base station, receives the synchronization channel of the base station, and synchronizes. At this time, mobile station 1
The power of the transmission unit 5 is turned off, and only the broadcast channel of the base station 4 which is the nearest base station is received.

Here, the handoff will be briefly described. When the mobile station is talking while moving, the search level is constantly monitored while searching for the pilot channel from the base station by the searcher unit 853 in FIG. 12, and the pilot channel transmitted by the connected base station is monitored. When the reception level of a pilot channel having a different code phase increases, it is determined that the base station that is transmitting this pilot channel is nearer, and the code phase of another control channel or speech channel is moved to this base station. To continue the call. This is called a handoff function, and in the case of the CDMA system in particular, since signals from adjacent base stations can be received simultaneously, switching can be performed while simultaneously receiving signals from two base stations having different code phases. In addition, since there is no interruption in communication at the time of switching, it is called soft handoff, which is a major feature of the CDMA system. The mobile phone system having the broadcast channel according to each embodiment of the present invention also has this handoff function.

As for the broadcast channel, when a base station having a higher reception level than that of the base station transmitting the broadcast channel being received is detected, the base station having the higher reception level is detected in the same manner as the above-described handoff function. Since it is possible to shift to the base station while simultaneously receiving the broadcast channel, it is possible to continuously and stably receive the received information without interruption.

Although the configuration of the broadcast information has not been described in detail in the present embodiment, the broadcast information itself can be divided into a plurality of information blocks and different information can be broadcast. For example, in the mobile phone system having a broadcast channel according to the present embodiment, the Walsh code No. 63 is assigned to the broadcast channel.
It is divided into four information blocks by repeating every byte,
Four broadcast channels can be secured.

[0130] In addition, the information can be transmitted asynchronously by adding an information header indicating the type of information and the channel number to the broadcast information and transmitting the information without fixed synchronization. For example, a plurality of pieces of information such as audio information, image information, and data information can be broadcast in a time-division manner.

FIG. 16 is a supplementary diagram for explaining an application of a portable telephone system having a broadcast channel according to the present invention. FIG. 16A shows an application of a general radio broadcast providing audio information. In the image diagram, the sound is reproduced from the speaker, and the name of the broadcasting station being received is displayed on the display unit. (B) of FIG.
FIG. 3 is an image diagram showing an application such as a general television broadcast for providing image information and audio information, in which audio is reproduced from a speaker and a received image is displayed on a display unit. FIG. 16C is an image diagram showing an application such as a general text broadcast for providing data information. The display unit displays received data and provides information such as traffic information and weather forecast. be able to. FIG. 16 (d) is an image diagram showing a situation where a user is talking while receiving image information. In the mobile phone system having a broadcast channel according to the present invention, the mobile phone system has a broadcast channel in addition to the talk channel and performs code spreading. Therefore, by providing a plurality of demodulators, it is possible to receive a broadcast channel while using a communication channel.

As described above, according to the present invention, in a portable telephone system for performing communication using a radio channel consisting of a communication channel and a control channel, a broadcast channel transmitting means is provided in a base station, and a broadcast channel Providing receiving means, the broadcast channel transmitting means always transmits regardless of the connection with the mobile station, and the broadcast channel receiving means receives without performing the connection procedure with the base station, so that the mobile station uses the control channel. Thus, information can be easily received without performing complicated connection processing such as registration with a base station.

In addition, while receiving a broadcast channel, the mobile station does not need to transmit any information to the base station, so that the transmission portion can be electrically turned off, and wasteful power is consumed. Broadcast channels can be received over a long period of time without having to do so.

In the above description of the first embodiment,
Although the broadcast channel modulator is provided separately from the communication channel in the base station, the communication channel modulator can be used as the broadcast channel modulator. For example, in the diagram of the traffic channel modulation unit in FIG.
1 is set to generate a Walsh code 63 for broadcasting, and the ExOR gate 7 of the long PN code generator 703 is set.
If the output to 04 is set to always output “0”,
The configuration is exactly the same as the configuration of the broadcast channel modulator 508 in FIG. 8, and the communication channel modulator can be used as the broadcast channel modulator. This is similar to the case of the mobile station in FIG.
6 and the setting of the long PN code generator 877 can be used not only as a demodulator for a speech channel but also as a demodulator for a broadcast channel.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a diagram illustrating a broadcast channel modulator 50 of a transmitter 950 of a base station in a mobile phone system having a broadcast channel according to a second embodiment of the present invention.
8 shows the configuration of FIG.

In FIG. 9, reference numeral 901 denotes a Walsh code generator; 902, an encoder; 903, a long PN code generator; 904, 905, ExOR gates; is there.

As in the first embodiment, the Walsh code generating section 901 receives a command from
The 63rd Walsh code is generated from the four Walsh codes and output to the ExOR gate 905.

The long PN code generation section 903 includes the control section 5
In response to the 02 command, a long PN code registered only for a plurality of predetermined mobile stations is generated and output to the ExOR gate 904.

The encoder unit 902 performs convolutional coding of transmission information and repetition (repetition) of codes in order to cope with code errors.
Output to

ExOR gates 904 and 905 are
This is a logic gate that takes an exclusive OR of inputs.

The quadrature modulation section 906 has the same phase (I
ExOR gate 905 outputs the short PN code output from short PN code generation section 611 for performing spread modulation of (channel) and short PN code generation section 612 for performing spread modulation of orthogonal (Q channel). The spread code is further spread and output through a low-pass filter (roll-off filter) for waveform shaping. The spread code of the I channel is output to the D / A converter 907, and the spread code of the Q channel is output to the D / A converter 908.

The D / A converters 907 and 908 convert the digital signal output from the quadrature modulator 906 into an analog signal and output the analog signal to the adder 505.

The difference between the broadcast channel modulator 508 according to the second embodiment and the broadcast channel modulator 508 according to the first embodiment shown in FIG. It is spread by the long PN code possessed by the mobile station.
There is a feature that only a specific mobile station can receive information transmitted on a broadcast channel. Therefore, by limiting pay broadcasts and areas, or by limiting recipients,
Information can be sent.

In the description of the second embodiment, the base station is provided with the broadcast channel modulator separately from the speech channel. However, the speech channel modulator is used as the broadcast channel modulator. Is also possible.
For example, in the drawing of the communication channel modulation unit in FIG. 7, the control unit 502 sets the communication Walsh code generation unit 701 to generate Walsh code 63 for broadcasting,
By making the long PN code generated by the long PN code generation section 703 a code unique to a specific mobile station, the configuration becomes exactly the same as that of the broadcast channel modulation section 508 in FIG. Can be used as This is similar to the case of a mobile station as shown in FIG.
3, the setting of the Walsh code generator 876;
Depending on the setting of the long PN code generation section 877, the long PN code generation section 877 can also be used as a demodulation section for a communication channel and used as a demodulation section for a broadcast channel.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 14 is a diagram showing a configuration of the base station control station 1 in a mobile phone system having a broadcast channel according to the third embodiment of the present invention.

In FIG. 14, reference numeral 310 denotes a storage unit. The configuration other than the storage unit 310 is the same as the configuration of the first embodiment shown in FIG.

The control unit 305 temporarily stores the broadcast information input from the dedicated telephone line 18 via the telephone line interface unit 301 in the storage unit 310 and then repeatedly reads out the broadcast information.
In addition, when transmitting text information, etc., via each base station, the broadcast station 17 and the base station control station 1 need to be connected only when updating the broadcast information without constantly connecting. Good. Therefore, it is possible to perform a simple broadcast such that the broadcast information is periodically updated from the general telephone line network 3 via the connection line 306, and it is also possible to use the system together with a method of constantly connecting and streaming through a dedicated line or the like. .

For example, a system in which information is updated periodically and broadcast, such as traffic information and a weather forecast, can be effectively operated, and broadcasting closely related to an area can be easily performed.

Further, if the broadcast station 17 is configured to add a broadcast area header to the broadcast information to be transmitted from the broadcast station 17 to the base station control station 1, the base station control station 1 selects a base station to broadcast based on the header. Thus, a mobile phone system having more effective broadcast channels can be realized. Since the broadcast station 17 can set a broadcast area for each piece of information to be broadcast, there is an advantage that it is not necessary to determine a broadcast range in advance.

[0150] For example, in FIG.
It is assumed that the area and the base station 6 are divided into area B. When the broadcast station 17 transmits the weather forecast with the broadcast information header of the area A and the traffic information with the broadcast information header of the area B, and transmits them to the base station controller 1, respectively, the base station controller 1 Is broadcast through the broadcast channels of the base station 4 and the base station 5, and the traffic information is broadcast through the broadcast channel of the base station 6.

In addition, by providing an information header having the content of simultaneous broadcasting in addition to the regional information, it is possible to simultaneously transmit the same broadcast in an emergency or the like.

As described above, since the broadcasting station 17 can determine the broadcasting area for each information, unlike the conventional radio broadcasting and television broadcasting, the broadcasting station 17 uses the portable telephone system to provide a broadcast having a high degree of freedom. Can be realized.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 17 shows a configuration of a base station transmitting section 950 of a base station in a portable telephone system having a broadcast channel according to a fourth embodiment of the present invention.

In FIG. 17, reference numeral 510 denotes a storage unit. The configuration other than the storage unit 510 is the same as the configuration of the first embodiment shown in FIG.

The control section 502 temporarily stores the broadcast information input via the base station control station interface section 953 in the storage section 510, and the control section 502 reads out the broadcast information and transmits it via the broadcast channel modulation section 508. Modulated and transmitted. As described above, in the present embodiment, the broadcast information is temporarily stored in the base station instead of the base station control station 1, so that the burden on the base station control station 1 can be reduced.

Although the second, third, and fourth embodiments described above have described the configuration on the base station side, the mobile station also includes the control unit 9 in FIG.
By providing the broadcast information storage unit 61, a more convenient portable telephone system can be realized. That is, the control unit 961 can store the broadcast information received via the broadcast channel, and can control the control unit 96 even in a place where connection with the base station is difficult and reception is not possible.
1 reads and displays or reproduces the stored information, so that the broadcast information can be effectively used.

Although not specifically described in each of the above-described embodiments, it is possible to realize a system for more stable reception by setting the transmission level of the broadcast channel slightly higher than the level of transmitting the communication channel. it can.

[0158]

As described above, according to the present invention, there is provided a portable telephone system having at least a base station and a mobile station and performing communication between the two stations using a radio channel including a communication channel and a control channel. The base station is provided with a broadcast channel transmitting means, the mobile station is provided with a broadcast channel receiving means, the broadcast channel transmitting means always transmits regardless of the connection with the mobile station, and the broadcast channel receiving means performs a connection procedure with the base station. The mobile station can receive information easily without performing complicated connection processing such as registration with the base station using the control channel.

Also, when receiving a broadcast channel, the mobile station does not need to transmit any information, so that the transmission portion can be electrically turned off, and thus wasteful power is consumed. Without receiving the broadcast channel, the broadcast channel can be received for a longer time than the talk time.

The code for spreading the broadcast channel is
Modulation is performed using a spreading code registered only for a specific number of mobile stations, and only mobile stations despreading with this spreading code can receive a broadcast channel. Information can be provided for mobile stations.

Further, a base station control station for controlling n (n is a natural number) base stations is provided, and the base station control station assigns first (m is a natural number, m <n) base stations to the first base station. Broadcast information is transmitted, and different information is transmitted for each region by controlling k (k is a natural number, k <n and k = nm) base stations to transmit the second broadcast information. Information such as traffic information and weather forecast can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a mobile phone system having a broadcast channel according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a base station control station of FIG.

FIG. 3 is a block diagram illustrating a configuration of a base station in FIG. 1;

FIG. 4 is a block diagram illustrating a configuration of a transmission unit in FIG. 3;

FIG. 5 is a block diagram illustrating a configuration of a receiving unit in FIG. 3;

FIG. 6 is a block diagram illustrating a configuration of a control channel modulator of FIG. 4;

FIG. 7 is a block diagram illustrating a configuration of a traffic channel modulator of FIG. 4;

FIG. 8 is a block diagram illustrating a configuration of a broadcast channel modulator of FIG. 4;

FIG. 9 is a block diagram showing a configuration of a broadcast channel modulation unit of a transmission unit of a base station in a portable telephone system having a broadcast channel according to a second embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of the mobile station shown in FIG.

FIG. 11 is a block diagram illustrating a configuration of a digital modulation unit in FIG. 10;

12 is a block diagram illustrating a configuration of a digital demodulation unit in FIG.

13 is a block diagram illustrating a configuration of a demodulation unit in FIG.

FIG. 14 is a block diagram showing a configuration of a base station control station 1 in a portable telephone system having a broadcast channel according to a third embodiment of the present invention.

FIG. 15 is an explanatory diagram for explaining a Walsh code.

FIG. 16 is an explanatory diagram for describing an application of a mobile phone system having a broadcast channel according to the present invention.

FIG. 17 is a block diagram illustrating a configuration of a transmission unit of a base station in a mobile phone system having a broadcast channel according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 base station control station 4, 5, 6 base station 14, 15, 16 mobile station 17 broadcast station

Claims (14)

[Claims] 1. A mobile phone system having at least a base station and a mobile station and performing communication between the two stations using a wireless channel including a communication channel and a control channel, wherein the base station includes a broadcast channel transmitting means. A mobile phone system having a broadcast channel, wherein the mobile station is provided with a broadcast channel receiving means. 2. The communication system according to claim 1, wherein the broadcast channel transmitting means performs transmission without performing connection control with a mobile station, and the broadcast channel receiving means performs reception without performing connection control with a base station. A mobile phone system having a characteristic broadcast channel. 3. The modulation method according to claim 1, wherein the modulation method is code spreading, the communication channel is modulated using a different spreading code for each mobile station, and the broadcast channel is different from the spreading code. 2. A mobile telephone system having a broadcast channel, wherein the mobile phone system modulates with a spread code of 2, and the broadcast channel receiving means performs despreading and demodulation using the second spread code. 4. The mobile phone system according to claim 3, wherein the second spreading code is a spreading code registered only for a specific number of mobile stations. 5. The base station according to claim 1, further comprising: a first storage unit configured to store information to be broadcasted via the broadcast channel, wherein the broadcast channel transmission unit includes the first channel unit. A portable telephone system having a broadcast channel, wherein information stored in a storage means is repeatedly read and transmitted from the broadcast channel. 6. The mobile station according to claim 1, wherein said mobile station stores information received via said broadcast channel, and contents stored in said second storage means. And a display / reproduction means for displaying or reproducing the information, and repeatedly reading out the information stored in the second storage means and displaying or reproducing the information on the display / reproduction means. 7. The base station control station according to claim 1, wherein the base station control station controls n (n is a natural number) base stations, and the base station control station includes m (m is a natural number, m <
controlling n) base stations to transmit the first broadcast information, and controlling k (k is a natural number, k <n and k = nm) base stations to transmit the second broadcast information. A mobile phone system having a broadcast channel. 8. The mobile station according to claim 1, wherein the receiving unit of the mobile station having at least a transmitting unit, a receiving unit, and a controlling unit is receiving the broadcast channel. A mobile phone system having a broadcast channel, wherein the mobile phone system controls to stop the operation of the unit. 9. The system according to claim 1, 2 or 3, wherein a transmission level of a first transmission unit for transmitting the broadcast channel of the base station is set to a second level for transmitting the communication channel.
A mobile phone system having a broadcast channel, wherein the mobile phone system has a higher transmission level than the transmission level of the transmission unit. 10. The mobile phone system according to claim 1, wherein the broadcast channel is divided into a plurality of fixed-length blocks. 11. The mobile phone system according to claim 1, wherein the broadcast channel is divided into a plurality of blocks, and header information is added to each block. 12. The mobile phone system according to claim 11, wherein the header information is information indicating a broadcast area. 13. The base station according to claim 1, further comprising a modulation spread code generator provided in the base station, wherein the modulation spread code generator generates the first signal when modulating the traffic channel.
Generating a spread code and modulating the broadcast channel, the modulation spread code generation section generates a second spread code and performs modulation by switching between the communication channel and the broadcast channel. A mobile phone system having a broadcast channel. 14. The mobile station according to claim 1, further comprising: a demodulation / spreading code generator provided in the mobile station, wherein the demodulation / spreading code generator is configured to perform the first demodulation / spreading code generation when demodulating the speech channel.
Generating a spread code and demodulating the broadcast channel, the demodulation spread code generator generates a second spread code and switches between the communication channel and the broadcast channel by performing demodulation. A mobile phone system having a broadcast channel.