JPH1022959A - Communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a communication equipment capable of preventing the deterioration of a transmission speed by outputting received data to a connected data terminal, etc., even at the time of erroneously receiving a data identification code in the middle of data communication. SOLUTION: As an enable signal inputted to a gate circuit 102, a forcedly received processing signal outputted in connection with the presence/absence of a reception error is AND-connected through an AND gate circuit 106 in addition to an enable signal from a comparator 101. Thereby, as the enable signal is inputted to the gate circuit 102 even when a reception error is generated and data identifying code can not be detected, received burst data is inputted to a data speed converter 103 and outputted through a selector 107.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device such as a mobile communication system capable of performing a plurality of different communication processes such as voice communication and data communication.

[0002]

2. Description of the Related Art Conventionally, cordless telephone systems and portable / car telephone systems have been known as wireless mobile communication systems. These mobile communication systems were primarily intended for voice communications used as telephones.

[0003] However, digitization is proceeding for the purpose of effective use of radio lines and the like, and accordingly, mobile communication system terminals originally used exclusively for voice communication are used.
It is considered to perform data communication.

A mobile communication system capable of performing both voice communication and data communication as described above has a determination circuit for determining the type of communication data. An identification code indicating the type is transmitted, and communication is started after the terminal is set to a mode corresponding to the type of communication data.

Here, as an example, a conventional determination circuit applied to a PHS will be described.

FIG. 7 is a diagram showing the relationship between burst data and output data. FIG. 7A shows a frame signal, and FIG.
FIG. 7B shows burst data, and FIG. 7B shows output data.

[0007] In the figure, in the frame signal of FIG. 7A, one frame is 5 ms.
Transmission and reception are repeated within a frame.
Here, the transmission timing is shown as a high level and the reception timing is shown as a low level. On the other hand, burst data is, for example, TDMA-TDD (Time Div.
In this method, four transmission channels and four reception channels are time-division multiplexed by a method such as ision Multiple Access-Time Division Duplex. Then, from the burst data, using the frame signal of FIG. 7A as a clue, a predetermined one channel of burst data allocated to the own device is received, and the transmission speed is adjusted to a speed suitable for the data terminal. And output to the data terminal as output data shown in FIG. 7 (c).

FIG. 6 shows the configuration of burst data for one channel and the configuration of a data identification code determination circuit of a conventional communication device.

In FIG. 6, received burst data 600
Is a data identification code (CI), a control communication procedure (SA),
It consists of data (DATA) and an error identification code (CRC).

[0010] The comparator 601 compares the input signal with a data identification code (CI code), and outputs an enable signal to the gate circuit 602 if the data identification code is a predetermined data identification code for received information. .

Gate circuit 602 converts received burst data into data rate converter 6 when an enable signal is input.
03 is output. The data rate converter 603 converts the data rate from the transmission rate of the burst to the transmission rate to be output to the data terminal and outputs it. If the comparator 601 cannot recognize the data identification code (CI code), it is assumed that another data identification code has been transmitted, and the data rate converter 603 receives the data identification code as shown in FIG. , A signal of all 0s is sent, and all data for one burst are invalidated, and a retransmission request or the like is made for data for one burst.

As a result, even if a reception error occurs only in the data identification code, all the data for one burst becomes invalid and the data for one burst must be retransmitted. The transmission speed will be reduced.

[0013]

As described above, in the conventional communication apparatus, when a data identification code (CI code) is erroneously received during data communication due to deterioration of a transmission path or the like,
Output of the received data for the burst is temporarily stopped,
The data terminal etc. could not receive the output. Therefore, even when a data terminal or the like is provided with an error correction circuit or the like, data must be retransmitted, and the rate of erroneously receiving a data identification code (CI code) due to deterioration of a transmission path during data communication is low. As the number increases, the data transmission speed may decrease significantly.

The present invention solves this problem, so that even if a data identification code (CI code) is erroneously received during data communication, the received data is output to a connected data terminal or the like. The purpose of the present invention is to prevent the deterioration of the material.

[0015]

According to the present invention, a data type is identified by a data identification code attached to received information, and a data identification code corresponding to a receivable data type is detected. When performed, in the communication device performing the receiving operation, by comparing the data identification code attached to the received information and the previously stored data identification code, data identification code detection means for detecting the data identification code, A reception error detection unit that detects the presence or absence of a reception error in the reception information; a case where the detected data identification code matches a preset data identification code; and a case where the data identification code is a preset data identification code. And reception processing means for performing a predetermined reception process when the reception error does not match with the reception error.

Further, according to the present invention, when the reception processing means can detect a predetermined data identification code without a reception error, a mode setting for forcibly performing a predetermined data identification code reception process is set. When a predetermined data identification code cannot be detected without a reception error, a mode for forcibly performing a reception process of a preset data identification code is canceled, and in the case of a reception error, a preset data identification code is canceled. A forced output setting means for holding a state of a mode for forcibly receiving a received data identification code, wherein the data identification code matches a preset data identification code or a preset data identification code. When the mode for forcibly performing the reception process is set, the reception process of the reception information is performed.

Further, the present invention is a communication device in which the communication device can perform communication by switching between voice communication and data communication, and the data identification code detecting means includes:
It is characterized by detecting whether or not the detected data identification code matches one of a data identification code indicating voice communication and a data identification code indicating data communication.

With such a configuration, according to the present invention, the present state is maintained when a reception error is detected, and the operation is performed when a predetermined data identification code is detected without a reception error. However, since it is released when another data identification code is detected without receiving error,
Even if the data identification code is erroneously received during the data communication, the received data is output and the deterioration of the transmission efficiency can be prevented.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a communication device according to the present invention will be described in detail with reference to the drawings.

As an example, a simplified portable telephone device (hereinafter, referred to as a portable telephone device)
An embodiment in which the present invention is applied to PHS will be described in detail below.

FIG. 2 is a block diagram of a PHS mobile station (PS) to which the present invention is applied.

In FIG. 2, reference numeral 11 denotes an antenna for transmitting and receiving radio waves to and from a base station (not shown); 1, a radio unit for transmitting and receiving signals transmitted and received via the antenna 11; A modem unit for demodulating the demodulated received signal and modulating the transmitted signal, a channel codec for extracting a slot signal to be received from the demodulated received signal and inserting the transmitted signal into a predetermined time slot to generate a TDMA signal Reference numeral 4 denotes a communication unit for performing ADPCM (Adaptive Pulse Code Modulation) modulation and PCM (Pulse Code Modulation) modulation / demodulation on transmission / reception signals; 43, a speaker as a receiver; and 44, a microphone as a transmitter.

Here, the radio unit 1 uses a transmission / reception switch 15 for switching the antenna 11 between the reception unit 12 and the transmission unit 13 and an oscillation signal of a reference oscillator 16 such as a crystal oscillator.
A synthesizer 14 for synthesizing a carrier signal required for transmission or reception, and a reception for frequency-converting a received radio frequency signal using a carrier signal output from the synthesizer 14 and finally converting it to a baseband signal A transmitting unit 13 that performs frequency conversion of a modulated transmission signal output from the modem unit 2 using a carrier signal output from the synthesizer 14, amplifies power to a level required for transmission, and transmits the modulated transmission signal; Consists of

The modem section 2 demodulates and detects the π / 4 shift QPSK modulation signal of the reception baseband signal output from the reception section 12 and converts it into a serial data signal.
And the serial data signal from the TDMA transmission unit 32
It is composed of a modulating unit 22 for modulating a / 4 shift QPSK modulated signal.

The channel codec 3 is a synchronizing circuit 33 for generating a synchronizing signal from the time-division multiplexed serial signal output from the demodulating unit 21. Further, based on the synchronizing signal, the channel codec 3 is allocated to its own station from the received signal. TDMA receiving section 31 which takes out the signal of the slot, determines the type of data based on the data identification code (CI code), and outputs it to a predetermined output port, and TDMA transmission which encodes a voice signal from communication section 4 into a transmission slot. It comprises a unit 32.

The communication unit 4 performs ADP for performing adaptive differential pulse code modulation for performing voice coding according to linear prediction of a voice signal.
It comprises a CM codec 41 and a PCM codec 42 which digitizes analog voice into PCM code and converts voice digitized into PCM code into an analog signal, and is connected to a speaker 43 as a receiver and a microphone 44 as a transmitter. ing.

Reference numeral 5 denotes a control unit, which includes a microprocessor or the like, and controls the entire apparatus.

Reference numeral 6 denotes a display unit for displaying a display and a dial number necessary for communication, 7 denotes an operation unit for performing various operations including key dial operation, 8 denotes a sounder for generating a ringing tone, and 9 denotes a control unit required for control. It is a memory unit for storing important information, programs, speed dials, and the like.

Further, the mobile station is provided with a data terminal interface 50. By connecting an external data terminal 10 via the data terminal interface 50, data communication can be performed. ing. When the external data terminal 10 is attached, a signal indicating whether or not the data terminal is connected is sent from the data terminal interface 50 to the control unit 5.

By the way, among the signals received by the mobile station, there are control signals for setting a radio line, a voice signal for the communication unit 4, and a data signal for the external data terminal 10. Information will be included.

FIG. 1 is a diagram for explaining the configuration of the TDMA receiving section 31.

In FIG. 1, reference numeral 110 denotes a data structure for one channel of received burst data, which includes a data identification code (CI code), a control / communication procedure (SA),
It consists of valid data (DATA) and an error identification code (CRC).

Reference numeral 101 denotes a comparator. The comparator 101 includes, as data identification codes, a code pattern indicating control data (hereinafter referred to as a control signal pattern), a code pattern indicating data transmission (hereinafter referred to as a data communication pattern), and a code pattern indicating voice communication. (Hereinafter, referred to as a voice communication pattern). The comparator 101 reads the data identification code (CI code) of the received burst data 110, compares the CI code with each of the code patterns, and outputs the result as a data identification code detection signal.

Reference numeral 104 denotes an error identification code (CRC)
This is an error detection circuit that detects the presence or absence of a reception error.

Reference numeral 105 denotes a mode for forcibly performing a predetermined data identification code receiving process based on the data identification code detection signal output from the comparator 101 and the error status signal output from the error detection circuit 104. This is a forced reception processing setting circuit to be performed. FIG. 3 shows an example of the configuration of the forced reception processing setting circuit 105.

As shown in FIG. 3, in the forced reception processing setting circuit 105, the first NAND gate circuit 152 is connected to the PR terminal of the SR flip-flop circuit 151, and the second NAND gate circuit 153 is connected to the CLR terminal. ing. Then, a signal obtained by inverting the error status signal and the data identification code detection signal by the inverter circuit 154 is input to the first NAND gate circuit 152. On the other hand, the second N
The error status signal and the data identification code detection signal are input to the AND gate circuit 153 as they are.

Reference numeral 106 denotes an AND signal between the data identification code detection signal and the forced reception processing signal, and an enable signal (L active).
Is an AND gate circuit that outputs

Reference numeral 102 denotes a gate circuit for reading out valid data (DATA) of the received burst data. When the enable signal is "L", the gate circuit 102 closes the gate and reads out valid data (DATA).

A data rate converter 103 extends the data rate of the valid data (DATA) read by the gate circuit 102 to a predetermined transmission rate.

Reference numeral 107 denotes a selector for switching the output destination of the speed-converted data to either the voice communication side (transmitter and receiver) or the data communication side (interface side). This selector 107 is a comparator 1
The output destination of the received data is switched based on the data identification code output from 01. Selector 1
07, when the data terminal 10 is not connected,
It is fixed to the voice communication side (transmitter and receiver) by a control signal of the control unit 5.

Next, the operation will be described.

A received signal received by an antenna 11 from a base station (not shown) is frequency-converted by a receiver 12 and further demodulated by a demodulator 21. Then, the slot allocated to the own station is extracted from the reception signal time-division multiplexed by the TDMA receiver 31. At this time, when the data being received is data communication, the extracted reception data is transmitted to the data terminal 10 via the interface circuit 50, and is output to the communication unit 4 when voice communication is performed. The communication unit 4 performs ADPCM demodulation and PCM demodulation, and
Output from 3.

The transmission signal is transmitted from the antenna 11 to the base station along the reverse path of the reception signal.

Here, the operation of the TDMA receiving section 31 will be described in more detail.

FIG. 4 is a diagram showing the relationship between burst data and output data.

The signals transmitted and received in the present embodiment are shown in FIG.
As shown in (a), TDMA has a frame configuration in which one cycle is 5 ms, in which four transmission slots and four reception slots are time-division multiplexed.
-TDD signal configuration.

The TDMA receiving unit 31 is assigned to its own device by using the frame signal [FIG. 4A] from among the time-division multiplexed burst data signals as shown in FIG. 4B. The received data burst data [shaded portion in FIG. 4 (b)] is received, the transmission speed is expanded to a speed suitable for the data terminal, and the data is sent to the data terminal as output data [FIG. 4 (c)].

The operation of the TDMA receiving unit 31 will be described with reference to FIG.

The comparator 101 reads out a data identification code (CI code) of the received burst data 110, and stores the CI code in each of the previously stored code patterns (control signal pattern, data communication pattern, voice communication pattern). Pattern).

First, when the detected CI code matches one of the three types of code patterns stored in advance, a data identification code corresponding to the data type is output to the control unit 5. The control unit 5 is notified of the data type of the received data. At this time, when the data type is the control signal pattern, the control unit 5 outputs the received control data together with the received control data. The data identification code is also output to the selector 107, and switches the selector 107 according to the data type of the received data.

At the same time, if the CI code matches either the data communication pattern or the voice communication pattern, the data identification code detection signal is sent to the AND gate circuit 106 and the forced reception processing setting circuit 105. Output to Here, the data identification code detection signal is “0” when it matches either the data communication pattern or the voice communication pattern, and is “1” when it is any other pattern. The data identification code detection signal does not need to distinguish between the case where the detected CI code is the data communication pattern and the case where the detected CI code is the voice communication pattern, but may use different codes. However, the data identification code output to the control unit 5 and the selector 107 is
It is necessary to distinguish between a data communication pattern and a voice communication pattern.

On the other hand, the error detection circuit 104 detects the presence or absence of a reception error by reading the error identification code (CRC) of the received burst data 110, and uses the result as an error status signal to set the forced reception processing setting circuit 105. Output to Here, the error status signal indicating the result is “H” when there is no error, and “L” when there is an error.

The forcible reception processing setting circuit 105 sets a mode for forcibly performing the reception processing of the preset data code based on the error status signal and the data identification code detection signal.

Here, the operation of the forced reception processing setting circuit 105 will be described with reference to FIG.

First, when there is no reception error and the CI code matches either the data communication pattern or the voice communication pattern, the error status signal becomes "H" and the data identification code detection signal becomes "L". Therefore, the output of the NAND gate circuit 152 becomes “L” (active). On the other hand, the output of the NAND gate circuit 153 becomes “H”, and the SR flip-flop circuit 151 is set (preset). At this time, since the forced reception processing signal "L" is output, the subsequent received data is forcibly output to the data terminal regardless of the data identification code (CI code).

If there is no reception error and the CI code does not match either the data communication pattern or the voice communication pattern, the error status signal becomes "H" and the data identification code detection signal becomes "H". For,
The output of the NAND gate circuit 152 becomes “H” and the output of the NAND gate circuit 153 becomes active “L”. Therefore, S
The R flip-flop circuit 151 is released (cleared), the forced reception processing signal becomes “H”, the mode in which the reception processing of the preset data code is forcibly released is released, and in response to the data identification code detection signal. As a result, data is output.

When there is a reception error, the outputs of NAND gate circuits 152 and 153 are both "L".
(Active), and the SR flip-flop circuit 151 maintains the original state, so that there is no change in the state of the mode in which the reception processing of the preset data code is forcibly performed.

By the way, in the operation of the forced reception processing setting circuit 105, since the CI code does not discriminate whether it is a data communication pattern or a voice communication pattern, one of these patterns is used. The state of the forced reception processing setting circuit 105 does not change even when the mode is switched to. Here, when the CI code switches between the data communication pattern and the voice communication pattern, the selector 107 is switched, so that the received data can be received by a predetermined receiving unit.

Further, the forced reception processing setting circuit 105 can be constituted by software. The operation in this case will be described with reference to the flowchart of FIG.

First, whether or not a data identification code matches a data pattern or a voice pattern is detected based on the presence or absence of a data identification code detection signal output from the comparator 101 (step 501).

If there is a data identification code detection signal (coincides with the data pattern or the voice pattern), it is determined whether or not a reception error has occurred (step 502).

If there is a reception error, the process returns to the waiting state, and if there is no reception error, a mode is set for forcibly performing a process of receiving a preset data code (step 503).

If it is determined in step 501 that the data identification code (CI code) does not match the data pattern or the voice pattern, the mode is set to forcibly perform a preset data code reception process. It is determined whether the setting has been made (step 504).

If the mode is not set so as to forcibly perform the process of receiving the preset data code, the process returns to the waiting state. If the mode for forcibly performing the preset data code reception process is set, it is next determined whether or not a reception error has occurred (step 505).

If there is a reception error, the process returns to the waiting state, and if there is no reception error, the mode for forcibly performing the reception processing of the preset data code is canceled (step 506).

In the procedure described above, the forced reception processing setting circuit 105 sets and cancels the mode for forcibly performing the reception processing of the preset data code. Based on the presence or absence of the data identification code detection signal, the gate circuit is opened and closed, and valid data can be read into the data rate converter 103.

When a mode for forcibly performing a predetermined data code reception process is set, regardless of the presence or absence of the data identification code detection signal, the AND gate circuit 106
(Active), the gate circuit 102 is closed, and valid data is read into the data rate converter 103.

After the data rate converter 103 performs a predetermined rate conversion, the data is output to the selector 107, and valid data is output to a predetermined path.

As described above, according to the present invention, if the data identification code (CI code) of the received burst data does not match the stored code pattern, the cause of the mismatch is a reception error. Since the mode for forcibly receiving data is set, data can be continuously received in the same manner as when the data identification code can be normally received. Therefore, it is not necessary to determine that all data of one burst is invalid.

When another CI code is received,
Since the mode for forcibly receiving data is canceled, unnecessary data is not accidentally fetched.
Therefore, when the receiving circuit includes the error correction circuit, it is not necessary to retransmit the data, so that it is possible to prevent a reduction in the overall data transmission efficiency.

[0071]

As described above, according to the present invention,
When a reception error occurs in a data identification code (CI code) due to deterioration of a transmission path during data communication,
Since the received data is forcibly output to the data terminal without interrupting the data communication, it is possible to prevent a reduction in the data transmission speed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a TDMA receiver according to one embodiment of the present invention.

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

FIG. 3 is a block diagram of a forced reception processing setting circuit according to one embodiment of the present invention;

FIG. 4 is a diagram showing the relationship between burst data and output data in one embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the forced reception processing setting circuit according to one embodiment of the present invention;

FIG. 6 is a block diagram of a conventional data identification code determination circuit.

FIG. 7 is a diagram showing a relationship between burst data and output data in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radio | wireless part 2 Modem part 3 Channel codec part 4 Communication part 5 Control part 6 Display part 7 Operation part 8 Sounder 9 Memory part 10 Data terminal 11 Antenna 12 Receiving part 13 Transmitting part 14 Synthesizer 15 Transmission / reception switch 16 Oscillator 21 Demodulation part 22 Modulation unit 31 TDMA reception unit 32 TDMA transmission unit 33 Synchronization circuit 41 ADPCM codec 42 PCM codec 43 Speaker 44 Microphone 50 Data terminal interface 101 Comparator 102 Gate circuit 103 Data rate converter 104 Error detection circuit 105 Forced reception processing setting circuit 106 AND gate 107 Selector circuit

Claims (3)

[Claims] 1. A communication apparatus for performing a receiving operation when a data type is identified by a data identification code attached to received information and a data identification code corresponding to a receivable data type is detected. A data identification code detecting means for detecting the data identification code by comparing the added data identification code with a previously stored data identification code; and a reception error detection unit for detecting the presence or absence of a reception error of the reception information. And if the detected data identification code matches a preset data identification code, and if the data identification code does not match a preset data identification code and the reception error is detected. And a reception processing means for performing reception processing of a preset data identification code. 2. The method according to claim 1, wherein the reception processing unit detects a predetermined data identification code without a reception error.
A mode for forcibly performing the reception process of the preset data identification code is set. When the preset data identification code cannot be detected without a reception error, the reception process of the preset data identification code is forcibly performed. In the case where there is a reception error, there is a forced output setting means for holding a state of a mode for forcibly performing reception processing of a preset data identification code, wherein the data identification code is 2. The reception information receiving process is performed when the received information matches a preset data identification code or when a mode for forcibly performing a preset data identification code receiving process is set. The communication device as described. 3. The communication device according to claim 1, wherein the communication device is a communication device capable of performing communication by switching between voice communication and data communication, wherein the data identification code detection unit determines that the detected data identification code is a voice communication. The communication device according to claim 1, wherein the communication device detects whether the data identification code matches one of a data identification code indicating data communication and a data identification code indicating data communication.