JPH11163965A - Communication synchronization establishing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable even a communicated party having a non-general synchronization establishing method to make successful synchronization establishment as much as possible. SOLUTION: A transmission and reception judgment device 31 judges whether it is on the transmission side or on the reception side when the synchronization establishment is demanded. When it is judged that it is on the transmission side, a negotiation demand frame receiver 34 receives a negotiation demand frame from the other party within a time t1 connected by a timer device 41 and, when the negotiation demand frame is not received, a negotiation demand frame transmitter 32 is made to transmit the negotiation demand frame. If the frame is received by the time t1, the negotiation reception frame is transmitted from a negotiation reception frame transmitter 33 and a synchronization establishment display is performed with a host layer. When it is on the reception side, it waits for a negotiation request frame from the other part just for the time t2 counted by a timer device 42 and, when the negotiation demand frame is not received, the negotiation demand frame is transmitted.

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 apparatus used for a communication apparatus 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, a plurality of methods coexist, but PHS (Personal Handyphone)
e System), PIAFS (PHS Intern)
et Access Forum Standard) mobile data communication service is available at a transmission rate of 32 kbit / s. In the PIAFS method, in order to perform synchronization for data modulation and demodulation, and to prepare for error correction processing, actual data communication becomes possible after performing synchronization establishment processing in a procedure called negotiation.

FIG. 7 shows a schematic configuration of a synchronization establishing device of a conventional PIAFS data communication device. When a request for establishing synchronization is made, the calling / calling determining apparatus 1 determines whether the calling / calling side is the calling side or the called side. The negotiation request frame transmitting device 2 receives a signal from the call originating / receiving determining device 1 and transmits a negotiation request frame to a communication partner as a synchronization establishment request signal. The negotiation accepting frame sending device 3 sends out a negotiation accepting frame as a response signal to the synchronization establishment request signal. The negotiation request frame receiving device 4 receives a negotiation request frame from a communication partner.
The negotiation reception frame receiving device 5 receives a negotiation reception frame from a communication partner.

[0004] Negotiation request frame sending device 2
Starts transmission of a negotiation request frame as a synchronization establishment request signal to a communication partner, and then stops transmission of the negotiation request frame when receiving a signal from the negotiation request frame receiving device 4 or the negotiation receiving frame receiving device 5. I do. After starting the transmission of the negotiation reception frame, the negotiation reception frame transmission device 3 stops transmitting the negotiation reception frame when the negotiation reception frame reception device 5 receives the negotiation reception frame from the communication partner. Upon receiving the negotiation request frame from the communication partner, the negotiation request frame receiving device 4 outputs a signal to the negotiation request frame transmitting device 2 and the negotiation receiving frame transmitting device 3 to stop the transmission of the negotiation request frame. The transmission of the negotiation reception frame is started. 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 transmitting device 2 and the negotiation receiving frame transmitting device 3 to stop transmitting the frame. The signals output by 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, synchronization is established in the PIAFS system by the following procedure. When the communication line is established, first, the calling / incoming call discriminating apparatus 1 discriminates whether it is the calling side or the called side. If it is the transmitting side, it outputs a signal for instructing the start of frame transmission to the negotiation request frame transmitting apparatus 2 and permits the operation of the receiving side circuit to receive the negotiation receiving frame from the partner side. Prepare for. The negotiation request frame sending device 2 instructed to start sending the frame starts sending the negotiation request frame to the communication partner. On the other hand, if it 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.

When the negotiation request frame transmitted from the transmitting side is received by the receiving side, the negotiation request frame receiving apparatus 4 on the receiving side outputs a signal for instructing the negotiation request frame transmitting apparatus 2 to stop transmitting the frame. I do. The negotiation request frame receiving device 4 outputs a signal for instructing the start of frame transmission to the negotiation accepting frame transmitting device 3 and notifies the upper layer in the PHS telephone device of the establishment of synchronization. The negotiation reception frame sending device 3 instructed to start the frame sending sends the communication
The transmission of the negotiation reception frame is started. When the negotiation receiving frame transmitted by the receiving side is received by the transmitting side, the negotiation receiving frame receiving apparatus 5 on the transmitting side instructs the negotiation request frame transmitting apparatus 2 and the negotiation receiving frame transmitting apparatus 3 to stop the frame transmission. And notifies the upper layer of synchronization establishment.

The procedure described above is performed, for example, as shown in FIG. However, this is only a general case, and there are those that actually transmit the negotiation request frame even on the receiving side and those that do not transmit the negotiation request frame even on the transmitting side. I can do it. First, in the case where the communication partner is to send a 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 a procedure in the case where the transmission side and the reception side almost simultaneously transmit a negotiation request frame as a synchronization establishment request. PIAFS
According to the provisions of the above, as a countermeasure against such contention of negotiation request frames, if the negotiation request frame is received from the other party when the self is transmitting the negotiation request frame, a synchronization request from the other party is received. Is given priority, and by transmitting a synchronization acceptance frame for the synchronization request, synchronization can be established without any problem.

[0009]

The PIAFS synchronization establishment procedure also has a function of determining a protocol to be used for data communication. At the time of the contention of the negotiation request frames as shown in FIG. 9, if the data communication protocols requested by the calling side and the called side are the same, the synchronization can be established without any problem. However, if the data communication protocol requested by the calling party is different from the data communication protocol requested by the called party, the data communication protocol requested by the other party cannot be accepted, and synchronization establishment will fail. Would.

Next, if the communication partner does not transmit a negotiation request frame even if it is the originating side,
Even if the communication line is established, each other is in a state of waiting for a negotiation request frame from the other party, and the synchronization establishment also fails.

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 correctly established depending on the synchronization establishment method of the data communication apparatus as the communication partner. .

[0012] The object of the present invention has been made in view of such circumstances.
An object of the present invention is to provide a communication synchronization establishing apparatus that can make synchronization establishment as successful as possible even when dealing with a communication apparatus having an unusual synchronization establishing method.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a device for transmitting and receiving digital data and establishing synchronization for modulation and demodulation of a signal, wherein a communication line is established between a transmitting device and a receiving device. A communication line establishing means for establishing a connection state and a communication line establishing means for judging whether the communication apparatus is a transmitting apparatus or a receiving apparatus after a communication line with a partner apparatus is established. When the incoming call discriminating means and the outgoing / incoming call discriminating means determine that the own device is the transmitting device, a synchronization establishing signal receiving device that waits for a synchronization establishing request signal from the receiving device for a predetermined time; And a synchronization establishment processing means for performing synchronization establishment processing in accordance with a predetermined procedure when receiving a synchronization establishment request signal from the receiving side device.

According to the present invention, when the connection state of the communication line is established between the calling side device and the called side device by the communication line establishing means, the calling / calling determining means determines whether or not itself is the calling side device. It is determined whether or not the device is the called device. When it is determined that the self device is the originating device, the synchronization establishment signal receiving means waits for a synchronization establishment request signal from the called device for a predetermined time, and when the synchronization establishment request signal is received from the other device, the synchronization establishment request signal is determined in advance. 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 establishment method of transmitting the synchronization establishment signal becomes the communication partner, the contention of the synchronization establishment request signal is avoided as much as possible, and the synchronization is successfully established. be able to.

Further, according to the present invention, when the synchronization establishment signal receiving means does not receive a synchronization establishment request signal from the receiving side device within the predetermined time, it sends a 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 it is determined by the transmission / reception determining means that the apparatus is the transmitting apparatus, the synchronization establishing signal receiving means does not receive the synchronization establishing request signal from the receiving apparatus within a predetermined time. At this time, the synchronization establishment signal transmitting means sends a synchronization establishment request signal to the receiving side device, so that a data communication device having a synchronization establishment method that does not send out a synchronization establishment request signal when it is the receiving side is the communication partner. In this case, synchronization can be successfully established.

Further, in the present invention, the synchronization signal receiving means waits for a synchronization establishment request signal from the transmission side apparatus for a predetermined time when the transmission / reception determination section determines that it is the destination side apparatus, When the synchronization establishment signal receiving means does not receive a synchronization establishment request signal from the transmission side apparatus within the predetermined time, the synchronization establishment signal transmission section further transmits a synchronization establishment request signal to the transmission side apparatus. It is characterized by.

According to the present invention, when the originating / incoming determining means determines that the apparatus is the receiving side apparatus, the synchronization establishing signal receiving section waits for a synchronization establishing request signal from the transmitting side apparatus for a predetermined time, When a synchronization establishment request signal is not received within the time, the synchronization establishment request sending signal is sent to the originating apparatus by the synchronization establishment signal sending means, so that even the originating side does not send the synchronization establishment request signal. Even when a data communication apparatus having the method becomes a communication partner, it is possible to avoid a state of waiting for a synchronization establishment signal from each other, and to smoothly succeed in establishing synchronization.

In the present invention, the synchronization is established by PIAF
It is characterized by being performed for performing data communication in the S system.

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

[0021]

FIG. 1 shows a schematic electrical configuration of a PHS telephone 10 according to an embodiment of the present invention. PHS
The telephone 10 is connected via the antenna 11 to, for example, 1.9.
It is possible to communicate with a communication partner via a base station in a frequency band of GHz. As the other end of the call, it is possible to establish a synchronization by connecting a communication line with a similar 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, and amplifies a high-frequency signal. The output of the low noise amplifier 13 is a band pass filter (hereinafter abbreviated as “BPF”).
14 and converted by a mixer 15 to an intermediate frequency. 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 a high-frequency signal from the frequency synthesizer 18 and converted to an intermediate frequency. In order to stabilize the transmission frequency with respect to temperature with the frequency synthesizer 18,
TCXO (Temperature Compensated crystal Oscillat)
or) is provided as a reference signal. IF
The output of the amplifier 17 is π / 4 shift QPSK (Quadr
rePhase Shift Keying). The transmission signal is modulated by the π / 4 shift QPSK modulator 21,
The signal is mixed with the output of the frequency synthesizer 18 by the mixer 22 and input 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, the use efficiency of the frequency is improved by using TDMA (Time Division Multiple Access) which is a time division multiple access technique. Extract and split the transmitted signal. The time division multiplexing circuit 25 further includes an ADPCM (Adaptive Differential Pulse C).
ode Modulation) The codec 26 encodes an analog signal in a voice band and converts it into a digital signal. A microphone 27 is used to supply an audio signal to the ADPCM codec 26, and the audio signal decoded by the ADPCM codec 26 is sonicated from a speaker 28. The time division multiplexing circuit 25 is further connected to a communication line establishing device 29 for performing data communication, and is also connected to a synchronization establishing device 30 of the present invention. A
The DPCM codec 26, the communication line establishment device 29, and the synchronization establishment device 30 are realized by a program operation of a microcomputer or a DSP.

FIG. 2 shows the internal configuration of the synchronization establishing circuit 30 of FIG. The synchronization establishing circuit 30 includes a calling /
1, a negotiation request frame transmitting device 32, a negotiation receiving frame transmitting device 33, a negotiation request frame receiving device 34, a negotiation receiving frame receiving device 35, and timer devices 41 and 42 are included. The negotiation request frame is PIAFS
It can be considered as a synchronization establishment request signal for requesting the establishment of synchronization between data communication devices. When a request for establishment of synchronization is made, the transmission / reception determination device 31 determines whether it is the transmission-side device or the reception-side device. The negotiation request frame sending device 32 receives the signal from the calling / calling determining device 31, and sends a negotiation request frame as a synchronization establishment request signal to the communication partner. The negotiation reception frame transmitting device 33 transmits a negotiation reception frame as a response signal to a synchronization establishment request signal from a communication partner. The negotiation request frame receiving device 34 receives a negotiation request frame from a communication partner. The negotiation reception frame receiving device 35 receives a negotiation reception frame from a communication partner.

Negotiation request frame sending device 3
2 starts transmitting the negotiation request frame to the communication partner, and then receives a signal from the negotiation request frame receiving device 34 or the negotiation receiving frame receiving device 35, and when any of the frames is received, the negotiation request frame is transmitted. 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 generates a response signal to the synchronization establishment request signal,
The transmission of the negotiation reception frame is started, and when the negotiation reception frame receiving device 35 receives the negotiation reception frame from the communication partner, the transmission of the negotiation reception frame is stopped. Upon receiving the negotiation request frame from the communication partner, the negotiation request frame receiving device 34 outputs a signal for instructing the negotiation request frame transmitting device 32 to stop transmitting the frame, and outputs the signal to the negotiation receiving frame transmitting device 33. A signal for instructing start of frame transmission is output. Upon receiving the negotiation reception frame from the communication partner, the negotiation reception frame receiving device 35 transmits a signal for stopping transmission of the frame to the negotiation request frame transmitting device 32 and the negotiation receiving frame transmitting device 33.

In the present embodiment, the first timer device 41 and the second timer device 42 are used to determine a predetermined time t.
1 and t2 are measured. The time t1 is determined by the PIAF when the calling / incoming discriminating apparatus 31 discriminates itself as the calling side.
This is provided to realize a delay time from when the synchronization establishment request of S is received to when the negotiation request frame sending device 32 starts sending the negotiation request frame. The second timer device 42 outputs a P
After receiving the IAFS synchronization establishment request, it does not send a negotiation request frame from itself, but counts a time t2 for waiting for reception of a negotiation request frame from a 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 indicating that synchronization has been established with an upper layer such as a control unit of the PHS telephone 10. Further, 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.
The setting is made to be optimal depending on the device configuration, the control method, and the like within a range in which the relationship of 5 seconds is established. For 15 seconds,
This is a standard value of the synchronization establishment waiting time.

FIG. 3 shows a procedure of the synchronization establishing process by the synchronization establishing device 30 of FIG. When the transmission / reception determination device 31 determines that it is the transmitting side, when the communication line is established, the operation of the receiving side circuit is permitted, and the timer device 41 is started. The timer device 41 measures the delay time t1 of sending the negotiation request frame, and
Until one elapse, only the negotiation request frame from the communication partner is waited for, and no transmission is performed from itself. When a negotiation request frame, which is a synchronization establishment request, is received from the called device on the other side until the time t1 has elapsed, a negotiation reception frame is sent from the calling device to the called device, and a synchronization establishment indication is displayed on the upper layer in the calling device. And normal synchronization is established.

FIG. 4 shows a procedure when a negotiation request frame as a synchronization establishment request signal cannot be received from the receiving side even if the time t1 counted by the timer device 41 in FIG. 3 has expired. Only when it is not possible to receive a negotiation request frame from such a communication partner, in the present embodiment, the negotiation request frame is transmitted from the communication device itself to the called device that is the communication partner. When the receiving-side device receives the negotiation request frame from the calling-side device, it sends out a negotiation-receiving frame in response to the negotiation request frame. And the synchronization establishment process is started. The operation procedure as shown in FIG. 4 is to perform normal synchronization establishment when the receiving side apparatus has a general “method of establishing a synchronization that does not transmit a negotiation request frame when the receiving side is the receiving side”. Can be. In this case, it is necessary to wait for the time t1. However, as shown in FIG. 3, when the negotiation request frame is transmitted even though the communication partner is the called side, the time t1 is used to avoid contention. Is required.

FIG. 5 shows that, when the calling / receiving determining device 31 determines that the receiving side is the called side, after the communication line is established, the operation of the receiving side circuit is permitted and the timer device 42 is started. The timer device 42 defines a negotiation request frame reception waiting time t2, and sets a time at which transmission of the negotiation request frame from the self side on the receiving side is started when a negotiation request frame from the other party cannot be received by the time t2. Stipulate. Time t2
When a negotiation request frame, which is a synchronization establishment request signal, is received from the originating side in the range up to the above, the called side sends out a negotiation acceptance frame and performs synchronization establishment indication to the upper layer. On the originating side of the communication partner, after receiving the negotiation reception frame, the synchronization establishment indication to the upper layer is performed.

FIG. 6 shows that when a negotiation request frame as a synchronization establishment request signal is not received from the transmitting side during time t2, the receiving side transmits a negotiation request frame to the transmitting side and responds to this. This shows a state in which a synchronization establishment indication is made to the upper layer when a negotiation reception frame is received from the calling side.

As described above, in the present embodiment, the transmission side waits for the negotiation request frame from the called side for a fixed time t1, and the negotiation request frame from the other side cannot be received during the fixed time t1. Only, the transmission of the negotiation request frame is started. Also, on the receiving side, when the negotiation request frame from the other side cannot be received during the fixed time t2, the transmission of the negotiation request frame is started. Therefore, in various cases, the synchronization can be successfully established 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.
It is possible to avoid contention of the synchronization establishment request signal as much as possible and to quickly succeed in establishing the synchronization, regardless of whether the communication side is a receiving side or a communication partner having a function of transmitting the synchronization establishment request signal.

Further, according to the present invention, the synchronization establishment request signal is not sent from the called side device within a predetermined time to the communication partner who does not send out the synchronization establishment request signal when it is the called side. In this case, the synchronization establishment request signal is transmitted to the receiving side device, so that the synchronization establishment can be surely succeeded.

According to the present invention, after the communication line is established,
Even if the receiving side device does not receive the synchronization establishment request signal from the transmitting side device within a predetermined time, the transmitting side device sends a synchronization establishment request signal to the synchronous transmitting side device. Even a data communication device having a synchronization establishment method that does not send an establishment request signal can successfully establish synchronization successfully.

Further, according to the present invention, mobile data communication using the PHS can be reliably performed by the PIAFS method.

[Brief description of the 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. 1;

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

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

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

FIG. 6 is a diagram illustrating an operation procedure of the synchronization establishing apparatus 30 of FIG. 2;

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

FIG. 8 is a diagram showing an operation procedure of the synchronization establishing apparatus of FIG. 7;

FIG. 9 is a diagram showing a synchronization procedure of the synchronization establishment device of FIG. 7;

[Explanation of symbols]

 Reference Signs List 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 multiplex circuit 26 ADPCM codec 27 Microphone 28 Speaker 29 Communication line Establishing device 30 Synchronization establishing device 31 Incoming / outgoing call discriminating device 32 Negotiation request frame sending device 33 Negotiation receiving frame sending device 34 Negotiation request frame receiving device 35 Negotiation receiving frame receiving device 41, 42 Timer device

Claims (4)

[Claims] An apparatus for transmitting and receiving digital data and establishing synchronization for modulation and demodulation of a signal, comprising establishing a connection state of a communication line between a transmitting side apparatus and a receiving side apparatus. Means for determining whether or not the communication apparatus is a calling apparatus or a receiving apparatus after a communication line has been established with the communication apparatus by the communication line establishing means; When the self-determining device is determined to be the originating device, a synchronization establishing signal receiving device that waits for a synchronization establishing request signal from the receiving device for a predetermined time, A synchronization establishment unit for performing a synchronization establishment process in accordance with a predetermined procedure when receiving the synchronization establishment request signal. 2. A synchronization establishment signal for sending a synchronization establishment request signal to a receiving side device when the synchronization establishment signal receiving means does not receive a synchronization establishment request signal from the receiving side device within the predetermined time. 2. The communication synchronization establishing apparatus according to claim 1, further comprising a transmission unit. 3. The synchronization signal receiving means waits for a synchronization establishment request signal from the transmission side apparatus for a predetermined time when the transmission / reception determination section determines that the apparatus is the destination side apparatus. When the signal receiving unit does not receive the synchronization establishment request signal from the transmission side device within the predetermined time, the signal reception unit further includes a synchronization establishment signal transmission unit for transmitting a synchronization establishment request signal to the transmission side device. The communication synchronization establishing apparatus according to claim 1, wherein: 4. The system according to claim 1, wherein the synchronization is established for performing data communication by a PIAFS method.
4. The communication synchronization establishing apparatus according to any one of claims 1 to 3.