JP3388699B2 - Communication synchronization establishment 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 synchronization establishing device used for a communication device having a function of performing data communication by transmitting and receiving digital data.

[0002]

2. Description of the Related Art In recent years, so-called mobile phones have become extremely popular. In mobile phones, PHS (Personal Handyphone)
In the e System) method, PIAFS (PHS Intern)
A mobile data communication service using the et Access Forum Standard) system is available at a transmission rate of 32 kbit / sec. In the PIAFS method, actual data communication becomes possible after performing synchronization establishment processing in a procedure called negotiation for synchronization for data modulation and demodulation, preparation for error correction processing, and the like.

FIG. 7 shows a schematic configuration of a synchronization establishing device of a conventional PIAFS data communication device. The outgoing / incoming call determining device 1, when requested to establish synchronization, determines whether it is the calling side or the called side. The negotiation request frame sending device 2 receives the signal from the call origination / termination determining device 1 and sends the negotiation request frame to the communication partner as a synchronization establishment request signal. The negotiation acceptance frame transmitting device 3 transmits a negotiation acceptance frame as a response signal to the synchronization establishment request signal. The negotiation request frame receiving device 4 receives the negotiation request frame from the communication partner.
The negotiation acceptance frame receiving device 5 receives the negotiation acceptance frame from the communication partner.

Negotiation request frame sending device 2
Stops transmitting the negotiation request frame when it receives a signal from the negotiation request frame receiving device 4 or the negotiation reception frame receiving device 5 after starting the transmission of the negotiation request frame as the synchronization establishment request signal to the communication partner. To do. When the negotiation reception frame receiving device 5 receives the negotiation reception frame from the communication partner after starting the transmission of the negotiation reception frame, the negotiation reception frame transmission device 3 stops the transmission of the negotiation reception frame. When the negotiation request frame receiving device 4 receives the negotiation request frame from the communication partner, the negotiation request frame receiving device 4 outputs a signal to the negotiation request frame sending device 2 and the negotiation acceptance frame sending device 3, and stops sending the negotiation request frame. Start sending the negotiation acceptance frame. Upon receiving the negotiation reception frame from the communication partner, the negotiation reception frame receiving device 5 outputs a signal to the negotiation request frame transmission device 2 and the negotiation reception frame transmission device 3 to stop the transmission of the frame. The signals output from the negotiation request frame receiving device 4 and the negotiation receiving frame receiving device 5 are also used as signals indicating that synchronization has been established.

[0005] Normally, the PIAFS method is used to establish synchronization in the following procedure. When the communication line is established, the originating / incoming discrimination device 1 first discriminates whether it is the originating side or the terminating side. When the device itself is the transmitting side, it outputs a signal for instructing the negotiation request frame transmitting device 2 to start transmitting a frame, permits the operation of the receiving side circuit, and receives the negotiation accepting frame from the other side. Prepare for The negotiation request frame sending device 2, which has been instructed to start sending the frame, starts sending the negotiation request frame to the communication partner. On the other hand, when the receiving side is the receiving side, the operation of the receiving side circuit is permitted to prepare for the reception of the negotiation request frame from the other side.

[0006] When the negotiation request frame sent by the calling side is received by the called side, the negotiation request frame receiving device 4 on the called side outputs a signal for instructing the negotiation request frame sending device 2 to stop sending frames. To do. The negotiation request frame receiving device 4 outputs a signal for instructing the start of frame transmission to the negotiation receiving frame transmitting device 3 and also notifies the upper layer in the PHS telephone device of the establishment of synchronization. The negotiation-accepting frame sending device 3 which is instructed to start sending the frame
Start sending out the negotiation acceptance frame. When the origination side receives the negotiation acceptance frame transmitted by the destination side, the origination side negotiation acceptance frame receiver 5 instructs the negotiation request frame transmitter 2 and the negotiation acceptance frame transmitter 3 to stop frame transmission. Signal is output and the upper layer is notified of synchronization establishment.

The procedure described above is performed, for example, as shown in FIG. However, this is a general case to the last, and there are actually those that send the negotiation request frame even on the called side and those that do not send the negotiation request frame on the contrary on the sending side. You can First, in the case where the communication partner sends the negotiation request frame even if it is the called side, when the communication line is established, the negotiation request frames are sent to each other.

FIG. 9 shows the procedure in the case where the negotiation request frame is sent as a synchronization establishment request from the calling side and the called side almost at the same time. PIAFS
According to the regulations, as a countermeasure against such contention of negotiation request frames, if the negotiation request frame is also received from the other side while sending the negotiation request frame, the synchronization request from the other side is requested. It is said that it is possible to establish synchronization without any problem by prioritizing and sending a synchronization acceptance frame in response to the synchronization request.

[0009]

The PIAFS synchronization establishment procedure also has a function of determining a protocol to be used for data communication. If the data communication protocols requested by the caller and the callee are the same when the negotiation request frames conflict as shown in FIG. 9, synchronization can be established without any problem. However, if the data communication protocol requested by the caller side and the data communication protocol requested by the callee side are different, the data communication protocols requested by the other party cannot be accepted and synchronization establishment fails. Will end up.

Next, if the communication partner does not send out the negotiation request frame even if it is the originating side,
Even if the communication line is established, both parties are waiting for the negotiation request frame from the other party, and the synchronization establishment fails again.

As described above, when the synchronization is established only in accordance with the PIAFS synchronization establishment procedure, there is a problem that the synchronization cannot be established correctly depending on the synchronization establishment method of the data communication device as the communication partner. .

In view of such circumstances, the object of the present invention is to
It is an object of the present invention to provide a communication synchronization establishment device that can successfully establish synchronization as much as possible even when a communication device having an uncommon synchronization establishment method is used as a partner.

[0013]

SUMMARY OF THE INVENTION The present invention is a device for transmitting and receiving digital data to establish synchronization for signal modulation and demodulation, and a communication line between a calling side device and a called side device. After the communication line establishing means for establishing the connection state and the communication line establishing means establishes a communication line with the other party's device, it is possible to determine whether it is the originating side device or the receiving side device. When the incoming call discrimination means and the outgoing / incoming call discrimination means discriminate themselves as the originating side device, a synchronization establishment signal receiving means for waiting a synchronization establishment request signal from the receiving side device for a predetermined time, and a synchronization establishment signal reception And a synchronization establishment processing means for performing synchronization establishment processing according to a predetermined procedure when the synchronization establishment request signal is received from the receiving side device by the means.

According to the present invention, when the communication line establishing means establishes the connection state of the communication line between the originating side device and the terminating side device, the outgoing / incoming call discriminating means determines whether or not it is the originating side device. Determine if it is the called device. When it is determined that the device is the transmitting side device, the synchronization establishing signal receiving means waits for the synchronization establishing request signal from the receiving side device for a predetermined time, and when the synchronization establishing request signal from the partner device is received, it is set in advance. The synchronization establishment processing is performed by the synchronization establishment processing means according to the procedure. Therefore, even if the data communication device having the synchronization establishing method for sending the synchronization establishing signal is the communication partner even on the receiving side, the competition of the synchronization establishment request signal is avoided as much as possible, and the synchronization establishment is smoothly succeeded. be able to.

Further, according to the present invention, when the synchronization establishment signal receiving means does not receive the synchronization establishment request signal from the receiving side device within the predetermined time, it transmits the synchronization establishment request signal to the receiving side device. It is characterized by further including a synchronization establishment signal transmitting means.

According to the present invention, when the calling / incoming / outgoing discrimination means discriminates itself as the transmitting side device, the synchronization establishment signal receiving means does not receive the synchronization establishment request signal from the receiving side device within a predetermined time. At this time, the synchronization establishment signal transmitting means sends the synchronization establishment request signal to the receiving side device, so that the data communication apparatus having the synchronization establishment method that does not send the synchronization establishment request signal to the receiving side device becomes the communication partner. Even in the case of synchronization, the synchronization can be smoothly established.

Further, in the present invention, the synchronization signal receiving means waits for a synchronization establishment request signal from the originating side device for a predetermined time when the originating / incoming discrimination means determines that it is the destination side device, When the synchronization establishment signal receiving means does not receive the synchronization establishment request signal from the transmission side device within the predetermined time, it further includes a synchronization establishment signal transmission means for transmitting the synchronization establishment request signal to the transmission side device. Is characterized by.

According to the present invention, when the call origination / incoming discrimination means discriminates itself as the receiving side device, the synchronization establishment signal receiving means waits for a synchronization establishment request signal from the originating side device for a predetermined time, When the synchronization establishment request signal is not received within the time, the synchronization establishment request signal is sent to the originating side device by the synchronization establishment signal sending means, so that even the originating side does not send the synchronization establishment request signal Even when the data communication device having the method becomes the communication partner, it is possible to avoid the state where they wait for the synchronization establishment signal from each other and to smoothly establish the synchronization.

Further, in the present invention, the synchronization is established by the PIAF.
It is characterized in that it is made to perform data communication in the S system.

According to the present invention, it is possible to easily succeed in establishing synchronization for data communication in the PIAFS system and perform efficient data communication.

[0021]

1 shows a schematic electrical configuration of a PHS telephone 10 according to an embodiment of the present invention. PHS
The telephone 10 receives, for example, 1.9 via the antenna 11.
It is possible to talk with a communication partner via the base station in the frequency band of GHz. As the other party of the call, it is possible to establish a synchronization by connecting a communication line to the same PHS telephone or various telephones connected to the general public telephone network. The antenna 11 is switched between a transmitting side and a receiving side by an electronic antenna switch 12. A low noise amplifier 13 is connected to the receiving side of the antenna switch 12 to amplify a high frequency signal. The output of the low noise amplifier 13 is a bandpass filter (hereinafter abbreviated as "BPF").
It is selected by 14, and converted into an intermediate frequency by the mixer 15. The output of the mixer 15 is band-limited by the BPF 16 and amplified by an intermediate frequency (hereinafter abbreviated as “IF”) amplifier 17. The mixer 15 on the output side of the BPF 14 is mixed with the high frequency signal from the frequency synthesizer 18 and converted into an intermediate frequency. In order to stabilize the oscillation frequency with temperature with the frequency synthesizer 18,
TCXO (Temperature Compensated crystal Oscillat
or)) is given as a reference signal. IF
The output of the amplifier 17 is π / 4 shift QPSK (Quadratu
rePhase Shift Keying) Demodulated by the demodulator 20. The transmission signal is modulated by the π / 4 shift QPSK modulator 21,
The mixer 22 mixes the output from the frequency synthesizer 18, and inputs the mixed output to the antenna switch 12 via the BPF 23 and the power amplifier 24. The antenna switch 12 switches the antenna 11 to the input side of the low noise amplifier 13 during reception, and switches the antenna 11 to the output side of the power amplifier 24 during transmission.

In the PHS telephone 10, since the frequency utilization efficiency is improved by using TDMA (Time Division Multiple Access) which is a time division multiple access technique, the target reception signal is selected from the reception signals by the time division multiplexing circuit 25. Extract and also split the transmitted signal. The time division multiplexing circuit 25 further includes an ADPCM (Adaptive Differential Pulse C
An ode modulation (CODE) 26 coded an analog signal in the voice band and converted it into a digital signal. A microphone 27 is used to give a voice signal to the ADPCM codec 26, and the voice signal decoded by the ADPCM codec 26 is sonicated from a speaker 28. The time division multiplexing circuit 25 is further connected with a communication line establishing device 29 for performing data communication, and also with a synchronization establishing device 30 of the present invention. A
The DPCM codec 26, the communication line establishing device 29, and the synchronization establishing device 30 are realized by a program operation of a microcomputer or DSP.

FIG. 2 shows the internal structure of the synchronization establishing circuit 30 shown in FIG. In the synchronization establishment circuit 30, the call origination / termination determination device 3
1, a negotiation request frame transmission device 32, a negotiation reception frame transmission device 33, a negotiation request frame reception device 34, a negotiation reception frame reception device 35, and timer devices 41 and 42. The negotiation request frame is PIAFS.
It can be considered as a synchronization establishment request signal for requesting establishment of synchronization between data communication devices. The outgoing / incoming call determining device 31, when requested to establish synchronization, determines whether the device itself is a calling side device or a receiving side device. The negotiation request frame sending device 32 receives the signal from the outgoing / incoming call determining device 31 and sends the negotiation request frame to the communication partner as a synchronization establishment request signal. The negotiation acceptance frame transmitting device 33 transmits a negotiation acceptance frame as a response signal to the synchronization establishment request signal from the communication partner. The negotiation request frame receiving device 34 receives a negotiation request frame from a communication partner. The negotiation acceptance frame receiving device 35 receives the negotiation acceptance frame from the communication partner.

Negotiation request frame sending device 3
After receiving the signal from the negotiation request frame receiving device 34 or the negotiation reception frame receiving device 35 after starting the transmission of the negotiation request frame to the communication partner, 2 receives the negotiation request frame of the negotiation request frame when any of the frames is received. Stop sending. When the negotiation request frame receiving device 34 receives the negotiation request signal from the communication partner as the synchronization establishment request signal, the negotiation reception frame sending device 33 receives the negotiation establishment request signal as a response signal to the synchronization establishment request signal.
When the negotiation reception frame receiving device 35 starts transmitting the negotiation reception frame and receives the negotiation reception frame from the communication partner, the transmission of the negotiation reception frame is stopped. When the negotiation request frame receiving device 34 receives the negotiation request frame from the communication partner, the negotiation request frame receiving device 34 outputs a signal for instructing the negotiation request frame sending device 32 to stop sending the frame to the negotiation receiving frame sending device 33. A signal for instructing the start of frame transmission is output. When the negotiation reception frame receiving device 35 receives the negotiation reception frame from the communication partner, it sends a signal for stopping the transmission of the frame to the negotiation request frame transmitting device 32 and the negotiation reception frame transmitting device 33.

In the present embodiment, the first timer device 41 and the second timer device 42 are used to set a predetermined time t.
Timings of 1 and t2 are performed respectively. The time t1 is the PIAF when the originating / incoming discrimination device 31 discriminates itself as the originating side.
It is provided to realize a delay time from the reception of the synchronization establishment request of S to the start of transmission of the negotiation request frame by the negotiation request frame transmission device 32. The second timer device 42, when the outgoing / incoming call determining device 31 determines that it is the receiving side device, P
After receiving the synchronization establishment request of the IAFS, the self does not transmit the negotiation request frame, but measures the time t2 for waiting the reception of the negotiation request frame from the communication partner. The signals output from the negotiation request frame receiving device 34 and the negotiation receiving frame receiving device 35 are also used as signals to the upper layers such as the control unit of the PHS telephone 10 indicating that the synchronization is established. Also, the delay time t1 of sending the negotiation request frame and the reception waiting time t2 of the negotiation request frame are 0 <t1 value <t2 value <1.
Within a range in which the relationship of 5 seconds is established, it is set to be optimum depending on the device configuration and control method. For 15 seconds,
This is the standard value for the synchronization establishment waiting time.

FIG. 3 shows a procedure of synchronization establishment processing by the synchronization establishment device 30 of FIG. When the outgoing / incoming call determining device 31 determines that it is the calling side, when the communication line is established, the operation of the receiving side circuit is permitted, and the timer device 41 is activated. The timer device 41 measures the delay time t1 of the negotiation request frame transmission,
Until one elapses, it only waits for the negotiation request frame from the communication partner, and does not transmit from itself. When a negotiation request frame, which is a synchronization establishment request, is received from the other party's called side device until time t1 elapses, the calling side sends out a negotiation acceptance frame to the called side device, and within the calling side device, a synchronization establishment indication is displayed to the upper layer. Then, normal synchronization is established.

FIG. 4 shows the procedure when the negotiation request frame as the synchronization establishment request signal cannot be received from the receiving side even when the time t1 measured by the timer device 41 in FIG. 3 has expired. In the present embodiment, the negotiation request frame is sent to the receiving side device which is the communication partner only when the negotiation request frame from the communication partner cannot be received. When the receiving side device receives the negotiation request frame from the calling side device, it sends out a negotiation acceptance frame as a response, so the originating side waits for the negotiation acceptance frame from the called side and displays the synchronization establishment indication to the upper layer. Then, the synchronization establishment process is started. The operation procedure as shown in FIG. 4 is to perform normal synchronization establishment when the receiving side device has a general “synchronization establishment method that does not transmit a negotiation request frame when the receiving side is the receiving side”. You can In this case, it is necessary to wait for the time t1, but as shown in FIG. 3, when the communication requesting party sends the negotiation request frame even though the communication partner is the receiving side, the time t1 is required to avoid the conflict. Is required.

In FIG. 5, when the originating / incoming discrimination device 31 discriminates itself as the receiving side, after the communication line is established, the operation of the receiving side circuit is permitted and the timer device 42 is activated. The timer device 42 defines the negotiation request frame reception waiting time t2, and sets the time to start the transmission of the negotiation request frame from itself as the receiving side when the negotiation request frame from the other party cannot be received by the time t2. Stipulate. Time t2
If a negotiation request frame, which is a synchronization establishment request signal, is received from the sending side within the range up to, the receiving side sends out a negotiation acceptance frame, and performs synchronization establishment display to the upper layer. On the transmission side of the communication partner side, after the negotiation acceptance frame is received, the synchronization establishment display for the upper layer is performed.

In FIG. 6, when the negotiation request frame as the synchronization establishment request signal is not received from the caller during the time t2, the callee sends a negotiation request frame to the caller and responds to this. When the negotiation acceptance frame is received from the transmission side, the state of performing synchronization establishment display to the upper layer is shown.

As described above, in this embodiment, when the originating side waits for the negotiation request frame from the receiving side of the other party for a fixed time t1 and the negotiation request frame from the other party cannot be received during the certain time t1. Only, the transmission of the negotiation request frame is started. Also, on the receiving side, when the negotiation request frame cannot be received from the other side within the fixed time t2, the negotiation request frame is started to be sent out. Therefore, in various cases, it is possible to establish synchronization as much as possible. Become.

[0031]

As described above, according to the present invention, it is possible to establish synchronization of a communication device having a function of performing data communication by transmitting and receiving digital data, when the transmitting side is itself,
Whether the receiving side or the communication partner having the function of transmitting the synchronization establishment request signal, the competition of the synchronization establishment request signal can be avoided as much as possible, and the synchronization establishment can be quickly succeeded.

Further, according to the present invention, the synchronization establishment request signal is not transmitted from the reception side device within a predetermined time even to the communication partner which does not transmit the synchronization establishment request signal when the reception side is the receiving side. In this case, since the synchronization establishment request signal is sent to the receiving side device, the synchronization establishment can be surely succeeded.

Further, according to the present invention, after the communication line is established,
Even if the receiving side device sends a synchronization establishment request signal to the synchronization originating side device when the synchronization establishing request signal is not sent from the originating side device within a predetermined time, the originating side device synchronizes. Even a data communication device having a synchronization establishing method that does not send an establishment request signal can surely succeed in establishing synchronization.

Further, according to the present invention, it is possible to surely perform mobile data communication by using the PHS by the PIAFS method.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic electrical configuration of a PHS telephone according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic electrical configuration of a synchronization establishing device 30 of FIG.

FIG. 3 is a diagram showing an operation procedure of the synchronization establishing device 30 of FIG.

FIG. 4 is a diagram showing an operation procedure of the synchronization establishing device 30 of FIG.

5 is a diagram showing an operation procedure of the synchronization establishing device 30 of FIG.

FIG. 6 is a diagram showing an operation procedure of the synchronization establishing device 30 of FIG.

FIG. 7 is a block diagram showing a schematic electrical configuration of a conventional synchronization establishing device.

8 is a diagram showing an operation procedure of the synchronization establishing device of FIG.

9 is a diagram showing a synchronization procedure of the synchronization establishing device of FIG.

[Explanation of symbols]

10 PHS telephone 11 antenna 12 antenna switch 13 Low noise amplifier 18 frequency synthesizer 20 π / 4 shift QPSK demodulator 21 π / 4 shift QPSK modulator 24 power amplifier 25 time division multiplexing circuit 26 ADPCM Codec 27 microphones 28 speakers 29 Communication line establishing device 30 synchronization establishment device 31 Call incoming and outgoing call identification device 32 Negotiation request frame sending device 33 Negotiation acceptance frame transmission device 34 Negotiation request frame receiver 35 Negotiation acceptance frame receiver 41,42 timer device

Claims (4)

(57) [Claims] 1. A device for transmitting / receiving digital data to establish synchronization for signal modulation / demodulation, wherein a communication line is established between a transmitting device and a receiving device. Means and the communication line establishing means establish a communication line with the other party's device, and then an outgoing / incoming call determining means for determining whether the device is a calling side device or a receiving side device, and an outgoing / incoming call determination When the device determines that the device is the transmitting side device, the synchronization establishing signal receiving device that waits for the synchronization establishment request signal from the receiving device for a predetermined time, and the synchronization establishing signal receiving device transmits the signal from the receiving device. A synchronization establishment device for communication, comprising: synchronization establishment processing means for performing synchronization establishment processing according to a predetermined procedure when receiving a synchronization establishment request signal. 2. A synchronization establishment signal for transmitting a synchronization establishment request signal to the receiving side device when the synchronization establishment signal receiving means does not receive the synchronization establishment request signal from the receiving side device within the predetermined time. The communication synchronization establishing apparatus according to claim 1, further comprising a transmitting unit. 3. The synchronization signal receiving means waits for a synchronization establishment request signal from the originating side device for a predetermined time when the originating / incoming discrimination means determines that it is the destination side device, and establishes synchronization. The signal receiving means further includes a synchronization establishment signal transmitting means for transmitting a synchronization establishment request signal to the originating device when the synchronization establishment request signal is not received from the originating device within the predetermined time. The communication synchronization establishment apparatus according to claim 1. 4. The synchronization establishment is performed to perform data communication by the PIAFS method.
5. The communication synchronization establishment device according to any one of 3 to 3.