JP3426856B2 - Communication device - Google Patents

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 devices and mobile / car telephone device systems have been known as mobile communication systems utilizing radio waves. These mobile communication systems were mainly intended for voice communication used as a telephone.

However, digitalization is progressing for the purpose of effective use of wireless lines, and along with this, the mobile communication system terminal originally dedicated to voice communication is used,
It is considered to perform data communication.

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

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

First, FIG. 7 is a relational diagram of burst data and output data. FIG. 7A shows a frame signal and FIG.
7B shows burst data, and FIG. 7B shows output data.

In the figure, one frame of the frame signal of FIG. 7A is 5 ms.
Transmission and reception are repeated within the 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).
The transmission 4 channels and the reception 4 channels are time-division multiplexed by a method such as ision Multiple Access-Time Division Duplex. Then, from this burst data, the frame signal of FIG. 7A is used as a clue to receive burst data for a predetermined one channel allocated to the own device, and the transmission rate is set to a rate suitable for the data terminal. And output to the data terminal as output data shown in FIG. 7 (c).

FIG. 6 shows the structure of burst data for one channel and the structure 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), control communication procedure (SA),
It is composed of data (DATA) and an error identification code (CRC).

Then, 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 reception information. .

The gate circuit 602 receives the received burst data when the enable signal is input to the data rate converter 6.
Output to 03. The data rate converter 603 converts the data rate from the burst transmission rate to a transmission rate for outputting 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 as shown in FIG. , A signal of all 0s is sent, all the data for one burst is invalid, and a retransmission request or the like is made for the data for one burst.

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

[0013]

As described above, in the conventional communication device, when the data identification code (CI code) is erroneously received during data communication due to deterioration of the transmission line,
The output of the received data for that burst is temporarily stopped,
The data terminal, etc. could not receive the output. Therefore, even if the data terminal or the like is provided with a corner error correction circuit or the like, the data is forced to be retransmitted, so that the rate of erroneously receiving the data identification code (CI code) due to the deterioration of the transmission line during the data communication may increase. When the number increases, the data transmission speed may decrease significantly.

The present invention solves this problem and outputs the received data to the connected data terminal or the like even if the data identification code (CI code) is erroneously received during data communication. The purpose is to prevent the deterioration of.

[0015]

In order to achieve the above object, the present invention identifies a data type by a data identification code attached to received information, and detects a data identification code corresponding to a receivable data type. In the communication device that performs the receiving operation, the data identification code detecting means for detecting the data identification code by comparing the data identification code attached to the reception information with the data identification code stored in advance, 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 data identification code in which the data identification code is preset And a reception processing unit that performs a predetermined reception process when the reception error is detected.

Further, according to the present invention, when the reception processing means can detect a predetermined data identification code without a reception error, a mode for forcibly performing a reception processing of a preset data identification code is set. If the predetermined data identification code cannot be detected without a reception error, the mode for forcibly performing the reception processing of the preset data identification code is released, and if there is a reception error, the preset value is set. Has a forced output setting means for holding a state of a mode for forcibly receiving the received data identification code, and when 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 of 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 switch between voice communication and data communication to perform communication, and the data identification code detecting means comprises:
It is characterized by detecting whether or not the detected data identification code matches either the data identification code indicating voice communication or the data identification code indicating data communication.

With such a configuration, according to the present invention, the current 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 canceled when there is no reception error and other data identification code is detected,
Even if the data identification code is erroneously received during data communication, it is possible to prevent the deterioration of the transmission efficiency by outputting the received data.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A communication device according to the present invention will be described in detail below with reference to the drawings.

As an example, a simple portable telephone device (hereinafter,
An embodiment when applied to PHS) will be described in detail below.

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

In FIG. 2, 11 is an antenna for transmitting / receiving radio waves to / from a base station (not shown), 1 is a radio section for transmitting / receiving a transmission / reception signal transmitted via the antenna 11, and 2 is an output from the radio section 1. A modem unit 3 for demodulating the received signal thus received and modulating the transmitted signal, a channel codec 3 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. Units 4 and 4 are a communication unit that performs ADPCM (Adaptive Pulse Code Modulation) modulation / demodulation and PCM (Pulse Code Modulation) modulation / demodulation on a transmission / reception signal, 43 is a speaker as a receiver, and 44 is a microphone as a transmitter.

Here, the radio unit 1 uses the transmission / reception change-over switch 15 for switching the antenna 11 between the receiving unit 12 and the transmitting unit 13 and the oscillation signal from the reference oscillator 16 such as a crystal oscillator.
Synthesizer 14 for synthesizing a carrier signal required for transmission or reception, and using a carrier signal output from synthesizer 14, a received radio frequency signal is frequency-converted and finally converted into a baseband signal. The transmission unit 13 that performs frequency conversion on the modulated transmission signal output from the unit 12 and the modem unit 2 by using the carrier signal output from the synthesizer 14 and amplifies the power to a level required for transmission and then transmits the signal. Composed 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 makes it a serial data signal.
And the serial data signal from the TDMA transmitter 32
The modulation unit 22 is configured to modulate a / 4 shift QPSK modulation signal.

The channel codec section 3 allocates a synchronization circuit 33 for generating a synchronization signal from the time-division-multiplexed serial signal output from the demodulation section 21 and, based on the synchronization signal, a reception signal assigned to its own station. TDMA transmission in which a signal from a slot is extracted, a data identification code (CI code) is used to determine the type of data, and the signal is output to a predetermined output port, and a voice signal from the call unit 4 is encoded into a transmission slot. It is composed of the unit 32.

The call unit 4 is an ADP that performs adaptive differential pulse code modulation that performs voice coding according to linear prediction of a voice signal.
A CM codec 41 and a PCM codec 42 that digitizes analog voice into PCM code and converts the voice digitized into PCM code into an analog signal are connected to a speaker 43 as a receiver and a microphone 44 as a transmitter. ing.

Reference numeral 5 denotes a control unit, which is composed of a microprocessor and the like, and controls the entire apparatus.

Reference numeral 6 is a display unit for displaying a display necessary for communication and dial numbers, 7 is an operation unit for performing various operations such as key dial operation, 8 is a sounder for producing a ringing sound, and 9 is necessary for control. A memory unit that stores various information, programs, speed dials, and the like.

Further, the mobile station is provided with a data terminal interface 50, and by connecting the external data terminal 10 via the data terminal interface 50, it becomes possible to perform data communication. ing. Further, 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 received a control signal for setting a wireless line, a voice signal for the call section 4, and a data signal for an 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 the data structure of one channel of the received burst data, which includes a data identification code (CI code), a control / communication procedure (SA),
It is composed of valid data (DATA) and an error identification code (CRC).

Reference numeral 101 is a comparator. The comparator 101 has, 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) is stored. Then, the comparator 101 reads out the data identification code (CI code) of the received burst data 110, compares this CI code with each code pattern, and outputs the result as a data identification code detection signal.

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

Reference numeral 105 designates a mode for forcibly receiving the preset data identification code from the data identification code detection signal output from the comparator 101 and the error status signal output from the error detection circuit 104. It is a forced reception processing setting circuit to be executed. An example of the configuration of the forced reception process setting circuit 105 is shown in FIG.

In the forced reception processing setting circuit 105, as shown in FIG. 3, the PR terminal of the SR flip-flop circuit 151 is connected to the first NAND gate circuit 152, and the CLR terminal is connected to the second NAND gate circuit 153. 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 directly input to the AND gate circuit 153.

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

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

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

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

Next, the operation will be described.

A reception signal received by the antenna 11 from a base station (not shown) is frequency-converted by the reception unit 12 and further demodulated by the demodulation unit 21. Then, the TDMA receiving section 31 extracts the slot assigned to the own station from the received signal which is time division multiplexed. At this time, when the received data is data communication, the extracted received data is sent to the data terminal 10 via the interface circuit 50, and in the case of voice communication, it is output to the call unit 4. In the call unit 4, ADPCM demodulation and PCM demodulation are performed and the speaker 4
Output from 3.

Regarding the transmission signal, the signal is transmitted from the antenna 11 to the base station by following the path opposite to that of the reception signal.

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

FIG. 4 is a relational diagram of burst data and output data.

The signals transmitted and received in this embodiment are shown in FIG.
As shown in (a), one cycle has a frame structure of 5 ms, in which 4 transmission slots and 4 reception slots are time-division-multiplexed.
-It has a TDD system signal configuration.

In the TDMA receiving unit 31, the frame signal [FIG. 4 (a)] is assigned to the own device among the burst data signals time-division multiplexed as shown in FIG. 4 (b). Burst data of reception information [hatched portion in FIG. 4 (b)] is received, the transmission rate is expanded to a rate suitable for the data terminal, and output data [FIG. 4 (c)] is sent to the data terminal.

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

In the comparator 101, the data identification code (CI code) of the received burst data 110 is read out, and this CI code is stored in advance in each of the code patterns (control signal pattern, data communication pattern, voice communication). Pattern).

First, when the detected CI code matches any one of the three previously stored code patterns, the 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 received control data is also output to the control unit 5. The data identification code is also output to the selector 107, and the selector 107 is switched 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 with either the data communication pattern or the voice communication pattern, and is "1" in other patterns. In the data identification code detection signal, it is not necessary to distinguish between the case where the detected CI code is the data communication pattern and the case where it is the voice communication pattern, but different codes may be used. However, the data identification code output to the control unit 5 and the selector 107 is
It is necessary to distinguish between the data communication pattern and the 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 reception burst data 110, and the result is used as an error status signal to set the forced reception processing setting circuit 105. Output to. Here, the error status signal indicating this result is a signal of "H" when there is no error and a signal of "L" when there is an error.

The forced reception processing setting circuit 105 sets a mode in which the reception processing of the preset data code is forcibly performed by the above 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 is "H" and the data identification code detection signal is "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 received data after that 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 is "H" and the data identification code detection signal is "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 for forcibly performing the reception processing of the preset data code is released, and the data identification code detection signal is output. Then, the data is output.

When there is a reception error, the outputs of the NAND gate circuits 152 and 153 are both "L".
Since the SR flip-flop circuit 151 does not become (active) and maintains the original state, the state change of the mode for forcibly performing the reception process of the preset data code does not occur.

Incidentally, in the operation of the forced reception process setting circuit 105, the operation is not distinguished whether the CI code is the data communication pattern or the voice communication pattern, and therefore, one of these patterns to the other is performed. The state of the forced reception process 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 means.

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

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

Here, if there is a data identification code detection signal (if it matches the data pattern or the voice pattern), it is judged whether or not there is a reception error (step 502).

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

If the data identification code (CI code) does not match the data pattern or the voice pattern in step 501, a mode for forcibly performing the reception process of the preset data code has already been set. It is determined whether or not it is set (step 504).

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

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

In the procedure described above, the forced reception process setting circuit 105 sets and cancels the mode for forcibly performing the reception process of the preset data code. Therefore, when this mode is released, , The gate circuit is opened / closed based on the presence / absence of the data identification code detection signal, and the valid data can be read into the data rate converter 103.

When the mode for forcibly performing the reception process of the preset data code is set, the AND gate circuit 106 is irrespective of the presence or absence of the data identification code detection signal.
Output becomes (active), the gate circuit 102 becomes “closed”, and valid data is read by the data rate converter 103.

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

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

When another CI code is received,
Since the mode for forcibly receiving the data is canceled, unnecessary data is not accidentally taken in.
Therefore, when the receiving circuit is provided with an error correction circuit, there is no need 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 the data identification code (CI code) due to deterioration of the 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 decrease in the data transmission rate.

[Brief description of drawings]

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

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

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

FIG. 4 is a diagram showing a relationship between burst data and output data according to an embodiment of the present invention.

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

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

FIG. 7 is a relational diagram of burst data and output data in a conventional example.

[Explanation of symbols]

1 radio section 2 Modem section 3-channel codec section 4 call section 5 control unit 6 Display 7 Operation part 8 sounders 9 memory 10 data terminal 11 antenna 12 Receiver 13 Transmitter 14 Synthesizer 15 Transmission / reception switch 16 oscillators 21 Demodulator 22 Modulator 31 TDMA receiver 32 TDMA transmitter 33 Synchronous circuit 41 ADPCM codec 42 PCM codec 43 speakers 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

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Claims (3)

(57) [Claims] 1. A communication device that performs a receiving operation when a data identification code corresponding to a receivable data type is detected by identifying a data type by a data identification code attached to the received information. 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 detecting section for detecting the presence or absence of a reception error in the reception information. And when the detected data identification code matches a preset data identification code, and when the data identification code does not match a preset data identification code and the reception error is detected And a reception processing unit that performs reception processing of a preset data identification code. 2. The reception processing means, when it is possible to detect a preset data identification code without a reception error,
Set the mode to force the receiving process of the preset data identification code, and force the receiving process of the preset data identification code when the preset data identification code cannot be detected without a reception error. In the case where there is a reception error, the mode to be carried out is carried out, and the data identification code has a forced output setting means for holding the state of the mode for forcibly performing the reception processing of the preset data identification code, The reception processing of the reception information is performed when the data identification code matches a preset data identification code or when a mode for forcibly performing the reception processing of the preset data identification code is set. The communication device described. 3. The communication device is a communication device capable of performing communication by switching between voice communication and data communication, wherein the data identification code detecting means detects that the detected data identification code is voice communication. 2. The communication device according to claim 1, wherein the communication device detects whether or not it matches either a data identification code indicating the above or a data identification code indicating the data communication.