JP2003143066A - Transmitter/receiver for mobile communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter/receiver, where the system constitution is simplified and also the employment efficiency of the system is elevated by raising the transmission efficiency of an up/down frame, in a mobile communication system. SOLUTION: This transmitter/receiver is composed of a voice-data generator 31, which generates a voice frame for accommodating voice data coded by each specified cycles T1, a transmission frame generator 32 which generates a plurality of transmission frames, each having a predetermined cycle T2 longer than the predetermined cycle T1 and portioning out the voice of a length of super-frame SF into voice data of a time shorter than it being obtained by the voice data generator 31, and a super-frame generator 32 which has a specified cycle T3 n times as long as the predetermined cycle T2 and transmits a transmission frame, constituted of not less than two and not more than 'n-1' voice data arranged therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter / receiver for mobile communication, and more particularly to a transmitter / receiver constituting a base station and each mobile station in a mobile communication system using a digital modulation method.

[0002]

2. Description of the Related Art Currently, various forms of mobile communication systems are widely put to practical use. However, the system of the present invention described below has a mobile station mounted on an automobile (such as a taxi) and a base station. An example of a vehicle allocation system for issuing a vehicle allocation instruction to each mobile station by grasping the position and movement of each mobile station (state of empty vehicle / actual vehicle / coming vehicle etc.) at the station (vehicle allocation center etc.). More specifically, GPS-AVM (Grobal Positioning)
A System-Automatic Vehicle Monitoring system will be described as an example. In this GPS-AVM system, a mobile station autonomously grasps its own position using GPS and further notifies the vehicle dispatch center of the data of the position. The current vehicle dispatch system uses this GPS-AVM system.
Systems are becoming mainstream.

FIG. 22 is a diagram showing an example of a general frame structure in a mobile communication system using a digital modulation method. In the figure, column (1) shows the frame structure of the downlink frame from the base station to the mobile station, and column (2) shows the frame structure of the uplink frame from the mobile station to the base station. In this figure, an arbitrary part (near the Nth) in the flow of the frame is extracted and shown. As shown in the figure, in a general frame flow, time is divided into frame units. Then, encoded voice data and non-voice data are transmitted by each divided frame. in this case,
The attribute of whether it is audio data or non-audio data is determined by the control data arranged in a predetermined position in each frame. In a general mobile communication system, communication is performed according to the above frame flow.

FIG. 23 is a diagram showing a schematic configuration of a GPS-AVM system, which is one form of the above-mentioned general mobile communication system. The present invention, as described above, uses this GPS
-The AVM system will be described as an example. In the figure, reference numeral 1 indicates, for example, GPS- which constitutes a vehicle dispatch system.
Base station 2 that is an AVM system and forms a dispatch center
And a plurality of mobile stations (1 to n) 3 mounted on an automobile (such as a taxi) and communicating wirelessly with the base station 1.

Transmission is performed from the base station 2 at the frequency f2 in the semi-duplex system. That is, even when there is no data to be transmitted, some data is always placed in each frame for transmission. On the other hand, the mobile station 3 can grasp the timing of each frame. Frequency f from mobile station 3
The data is transmitted at 1, but each time there is data to be transmitted to the base station 2, the data is transmitted at the timing of each frame. Also, the mobile station 3 transmits the required data to the base station 2 each time it is designated by the base station 2 and only at that time in synchronization with the timing of each frame.

In particular, in the GPS-AVM system 1, frequent uplink frames are sent to the base station 2 so that the current position and dynamics (actual vehicle / empty vehicle / intercepting vehicle) of each of a large number of mobile stations 3 can be always accurately grasped. Is sent. Therefore, an arbitrary transmission method is adopted for the current position. In this method, every time the mobile station 3 moves a certain distance such as 50 m, the position is autonomously notified to the base station 2 by using an upstream frame.

The respective configurations of the base station 2 and the mobile station 3 are as follows. FIG. 24 is a diagram showing a configuration example of a mobile station side transmitting / receiving apparatus in the GPS-AVM system. In the figure, the transmission / reception device 4 of the mobile station 3 performs only the receiving operation at the time of reception and only the transmitting operation at the time of transmission.

A signal from the base station 2 is received by the transmitter / receiver 9 via the base station communication antenna. Further, the digital modulator / demodulator 8 demodulates the received signal, and then the control section 7 reproduces the content. When it is determined that this content is voice data, the bit string is decoded by the voice decoder 6 and output from the speaker as the original voice. When it is determined that the vehicle dispatch data is addressed to the own station, this is displayed on the data display unit 10.

On the other hand, when transmitting a voice from the mobile station 3 to the base station 2, the operator pushes the transmission switch (ON) and inputs from the microphone. This input voice is encoded by the voice encoder 5 and converted into a bit string. The control unit 7 receives this, adds a code indicating that it is voice, and sends it to the digital modulator / demodulator 8. Here, it is modulated into a predetermined format and transmitted from the antenna.

On the other hand, the position data of the mobile station 3 is generated by a GPS receiver 11 by receiving a GPS signal from a GPS satellite. The control unit 7 transmits the position data each time the position data is separated by a predetermined straight line distance or more from the previous position data transmission. On the other hand, the configuration on the base station side is as follows. Figure 25 is GP
It is a figure which shows the structural example of the base station side transmission / reception apparatus 12 in an S-AVM system.

In the transmitter / receiver 12 shown in the figure, when the operator presses the transmitter switch and the voice is input from the microphone, it is modulated by the digital modulator 15 and directed from the transmitter 16 to the mobile station 3 via the antenna. And is transmitted as a downlink frame. Further, with respect to the vehicle allocation data from the base station 2, the operator operates the client 18 to input the same, and the host computer 17 which receives the data receives the same through the transmission control unit 14 as in the case of the above-mentioned input voice.
It is sent to the mobile station 3 side.

On the other hand, when the position data of each mobile station transmitted from the mobile station 3 side by the above-mentioned arbitrary transmission method is received by the receiving unit 22 via the antenna, the digital demodulator 2
At 1, demodulate as the original position data. When the reception control unit 20 finds that this is position information instead of voice information, it is input to the host computer 17 side and further sent to the client 18.

On the other hand, when it is determined by the above demodulation that the voice information is the above voice information, the voice decoder 19 reproduces the original voice and outputs it from the speaker to the operator. The subject of the invention relates in particular to the frame shown in FIG. 22 above. FIG. 26 is a diagram showing a frame configuration example according to the first conventional example. This first conventional example is the Japanese Patent Application No. 2000 by the present applicant.
-035672 (JP 2001-223630 A). Here, necessary for digital modulation system,
The description of the synchronization signal, the error correction bit, the rising and falling ramp times, the guard time, etc. is omitted for simplification.

Further, here, in general,
Assuming a frame length of 40 mS and a transmission amount excluding the above omitted bits from the total transmission amount 9600 BPS, the transmission amount of one frame (including the error detection code) is 16
It is 9 bits. Hereinafter, the description will be given by unifying to 169 bits. In FIG. 26, M is a bit indicating the number of the mobile station 3 of the transmission destination in the downlink frame and the number of the mobile station 3 of the transmission source in the uplink frame.
Is a bit for distinguishing the following audio / non-voice data from the audio data or the non-voice data, and the audio / non-voice data contains the contents of the voice data or the non-voice data. To do.

Looking at this voice data, AMB, which is currently said to have the highest compression rate in the voice encoding system,
An example in which the E method (AMBE: Advanced MultiBand Excite (DVSI, USA)) is adopted is shown. According to this AMBE method, voice is processed with a voice frame of 20 mS as one unit, and compressed voice data of 48 bits is generated for each unit. In FIG. 26, the audio data is AMBE.
Depending on the system, 9 as audio signals for 40 mS (2 x 20 mS)
It is generated and allocated with 6 bits.

The control data (46 bits) following the 96 bits is a response signal to the transmission signal by the arbitrary transmission method in the upstream frame. CRC (16 bits) following this control data is an error detection code for discarding the data when an error is detected during transmission. In addition, in FIG. 26, the CRC calculation is performed for the slender portion c.
M, D / V, voice / non-voice data and control data. That is, the CRC is added to detect bit errors from these full bit ranges.

In the GPS-AVM system applied to a taxi dispatch system, for example, in the frame structure shown in FIG. 26, downlink non-voice data includes dispatch data (usually a plurality of frame lengths), response signals (single frame), etc. On the other hand, the upstream non-voice data contains the position data (single frame) of the mobile station 3 and the dynamic data (single frame), respectively.

According to the first conventional example described with reference to FIG. 26, although the frame can be applied to the downlink transmission signal, it cannot be applied to the uplink transmission signal. There is a disadvantage that efficiency cannot be improved. There is a second conventional example by the present applicant that can avoid this inconvenience. This is disclosed in Japanese Patent Application No. 11-214275 (Japanese Patent Laid-Open No. 2001-4492).
No. 0). Here, the transmission frame of another cycle is created by compressing the audio frame. By utilizing this new transmission frame, even when a certain mobile station is transmitting an upstream signal, other mobile stations can transmit the data of the upstream signal.

[0019]

In the second conventional example described above,
In the first aspect, it is proposed to change the frame length between the upstream frame and the downstream frame. For example, (i) 20mS reception and 20mS transmission, and (ii)
It is transmission such as reception of 30 mS and transmission of 30 mS.

However, the first problem is that the program in case (i) and the program in case (ii) above are required, and the processing becomes complicated. Further, since the base station 2 and each mobile station 3 must hold different programs, there is a second problem that an economical system cannot be constructed. Furthermore, there is a third problem that the transmission timing of the mobile station 3 must be synchronized in units of a plurality of frames transmitted by the base station 2, which complicates the transmission timing setting means. .

Even if another aspect other than the first aspect of the second conventional example is adopted, since the voice frame length and the transmission (non-voice) frame length are different, the transmission timing of the transmission frame is the voice frame. Therefore, the same problem as the third problem arises. Therefore, in view of the above problems, it is an object of the present invention to provide a transceiver for mobile communication, which can greatly improve the operation efficiency of the system.

Specifically, in a mobile communication system such as a GPS-AVM system, the transmission timing can be easily adjusted. Therefore, the structure of the transmission / reception device can be simplified and the cost can be reduced. The object is to improve the signal transmission efficiency even in the upstream frame. Furthermore, it is an object of the present invention to enable efficient communication not only between the base station and each mobile station but also between the mobile station and the mobile station.

[0023]

FIG. 1 is a diagram showing a basic configuration example of a transmitting / receiving apparatus according to the present invention. The transmission / reception device according to the present invention has substantially the same configuration for both the mobile station device (4) and the base station device (12). The transmission / reception devices 4 and 12 have a superframe sending means 30.
Have. The superframe sending means 30 divides the data (IN) to be sent to the receiving side into a plurality of frames each having the same time length, accommodates them, assembles a series of a plurality of frames into a superframe, and sends (OUT). .

As an example, the superframe transmitting means 30 can be composed of an audio data generating section 31, a transmission frame generating section 32, and a superframe generating section 33, as shown in the lower part of FIG. These generators will be described later in detail. FIG. 2 is a diagram showing an example of a frame structure output from the super frame sending means 30.

That is, the output OUT of FIG. 1 forms a superframe SF, and is composed of a plurality of frames fr each having the same time length (for example, 40 mS), which is 160 mS as a whole. In the figure, four frames fr (0 to 3) are shown as an example. That is, the superframe SF is assembled with four frames as a repeating unit. Then, the audio data and the non-audio data are distributed in the superframe SF formed of four frames fr having the same frame length.

One of the features of the present invention is that the frame lengths of the upstream frame and the downstream frame are different from each other in the above-mentioned second conventional example, but a common frame structure is used. The following points are also one of the features of the present invention. That is, one is the mobile communication transceiver 12 provided in the base station 2 and the other is the mobile communication transceiver 4 provided in each of the plurality of mobile stations 3, from the base station 2 to the mobile station 3. Downlink superframe SF to the base station 2 from the mobile station 3 to the base station 2
Both (upstream) have the same frame configuration.

Thus, the above-mentioned first, second and third problems are basically solved. In this case, the same frame fr
It is considered that the above-mentioned characteristic that a plurality of are grouped into a superframe SF is similar to the TDMA technology adopted in a general digital mobile phone. However, it differs from this TDMA technique. This point will be described later.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows each frame fr shown in FIG.
It is a figure which shows the structure of specifically. Throughout the drawings, the same reference numerals or symbols are given to the same components. In FIG. 3, 3 of frame 0 to frame 2 of FIG.
Frames are shown in the (1) column as fr0 to fr2, and are shown in FIG.
The frame 3 of this is shown in the (2) column as fr3. In the figure, "M" (mobile station number), "voice data", and "CRC"
And “c” are the same as those described in FIG.
Also, non-voice data is shown as "transmission / control data". The "accompanying data" can be used in the down frame when giving a simple instruction to the taxi crew. In addition, in the upstream frame, it can be used for the above-mentioned notification of dynamics.

The "frame No." is one of the features of the present invention, and the transmission frame generation unit (31 in FIG. 1) uses the transmission frames fr0 to fr2 for voice and the transmission frame fr3 for non-voice. It is a unique frame number assigned to each of the plurality of transmission frames that include it. What should be noted in the frame configuration of FIG. 3 is four frames (fr0 to fr0).
That is, the audio data obtained by encoding the audio for the time (fr3) (160 mS) is compressed into three frames fr0 to fr2 and arranged.

As a result, it is possible to make a space for transmission of voice data in the final frame fr3 and accommodate the transmission / control data which is non-voice data in this space. Further, looking at the bit arrangement in each frame fr, in FIG. 3, first, "frame No."
Is 2 bits for distinguishing four frames, "M"
Is 10 bits which is enough to identify about 1000 taxis (mobile stations), the "accompanying data" is 13 bits which is enough to notify various information related to the above-mentioned dynamics, and "CR
"C" is 16 bits as in FIG.

Looking at the "voice data", as described above, the voice of 160 mS is divided into three frames fr0 to fr.
Since it is evenly distributed to 2, each voice data is 53.333.
This corresponds to (= 160/3) mS voice. Further, as described above, in the AMBE method, the voice of 20 mS is the voice data of 48 bits, so the voice data of FIG.
333 mS) is 128 (= 48 × 160/20) bits, and each of the frames fr0 to fr2 is unified to 169 bits as a whole as described above. Since the frame fr3 also has 169 bits as a whole, 141 bits are allocated to the transmission / control data.

With the frame structure as shown in FIG. 3, voice data and transmission / control data are superimposed and transmitted in the downlink frame. In the upstream frame, when voice is transmitted from a certain mobile station 3, in the superframe SF transmitted from this mobile station, the voice data is not transmitted in frame fr3. Therefore, in this frame fr3, non-voice data (transmission data) can be transmitted to the base station 2. Moreover, since the upstream frame and the downstream frame have the same frame cycle of 40 mS, the device configurations of the transmitting and receiving devices 4 and 12 are simplified.

Reference is now made to FIG. 3 and the bottom of FIG. The three generators 31, 32 and 33 of FIG. 1 which constitute the superframe sending means 30 operate as follows. The voice data generation unit 31 determines that the voice to be transmitted to the receiving side is the first
The encoded voice data is generated every predetermined period T1 (corresponding to the above-mentioned 20 mS) and stored in the voice frame.

The transmission frame generating section 32 has a second predetermined period T2 (each of the above 40) which is longer than the first predetermined period T1.
of a plurality of transmission frames each having mS) and sound corresponding to the time length (160 mS) of the superframe SF is obtained by the sound data generation unit 31 and has a time shorter than the time length of SF ( A plurality of transmission frames (fr0 to fr3) arranged as 128 bits are generated.

The superframe generator 33 is a superframe SF having a third predetermined period T3 (160 mS) that is n (eg, n = 4) times as long as the second predetermined period T2. n / 2 (for example, 2 if n = 4)
And transmission frames of (n-1) or less (in FIG. 3,
3 transmission frames) are arranged in the SF and transmitted.
Here, the reason why the expression "transmission frame exceeding n / 2 and (n-1) or less" is described while clarifying the difference from the TDMA technique described above.

As described above, the present invention has some similarities with the TDMA technique used in digital mobile phones, but in the TDMA technique, the transmission amount is increased by using a wide band, and N minutes in time is correspondingly increased. This is a method of configuring divided transmission lines. Therefore, a voice frame has a transmission slot with a length of 1 / N, and a unit of N transmission slots is called a frame.

On the other hand, the present invention has a limited band (narrow band), and the transmission amount per carrier (f1 and f2 in FIG. 23) is the transmission when the voice is encoded and the control signal is added. It provides a more efficient transmission method when it is close to the quantity. This is essentially different from TDMA technology. In order to clarify this point in the superframe generation unit 33, the expression “transmission frame exceeding n / 2 and (n−1) or less” is used.

Next, an example of the operation of the transmission / reception devices 4 and 12 according to the present invention will be described. FIG. 4 is a flowchart showing an operation example of the base station side transmitting / receiving apparatus 12. First, the points of operation will be described. This also applies to other flowcharts described later. Since the present invention focuses on the air format for executing efficient transmission and control, only a flow chart for generating a transmission signal is shown, and a flow chart for reception is omitted. These flowcharts are executed for each frame as interrupt processing for each frame. The frame No. (Frame
No. The initial value of) is 0.

In the operation example of the base station 2 shown in FIGS. 1 and 3, regardless of whether the transmitter switch is ON or OFF, the frame No.
No. 0 to 2 (fr0 to fr2) indicates voice, and frame No.
In 3 (fr3), transmission data or control data is sent out. Frame No. Is managed by the base station 2 and 0 → 1 → 2
→ 3 → 0 → ... Cycles to form a superframe SF.

On the receiving side, the frame number. , And distinguish between voice and data, and proceed with the process. In the mobile station 3, the frame number. Is the frame number transmitted from the base station 2. Are assigned in synchronism with the above, and the frame correspondence of the downlink frame / uplink frame and the uplink transmission timing are separately specified. Therefore, the transmission frame No. of the mobile station 3 is set. Is generated from the received data. For example, the frame number of the upstream frame to be transmitted. 0, 1 ... are the frame numbers of the received downlink frames. It is generated with a delay of 0, 1 ...

That is, when a super frame SF in which a unique frame number (frame No.) is assigned to each of a plurality of transmission frames including a transmission frame for voice and a transmission frame for non-voice is received from the transmission side, The transmission frames for transmission are sequentially generated in synchronization with the frame number in the superframe SF, and the superframe generation unit 33 transmits the frames.

In the mobile station 3, the frame number. In the case of 0 to 2, if the transmission switch is pressed, the audio signal is changed to the frame number. In the case of 3, when the prescribed transmission conditions such as traveling a certain distance from the previous position data transmission are satisfied,
Send position data. Please refer to FIG. Step S101: It is judged whether it is the transmission timing of the frame fr3.

Step S102: If YES, the data from the host computer 17 (FIG. 25) is transferred / transmitted.
Control Data "bit (FIG. 3). Step S103: If NO, set the voice data from the voice encoder 13 to the "voice data" bit (FIG. 3). Step S104: The incidental data from the host computer 17 is set in the "accompanying data" bit (FIG. 3).

Step S105: The number of the destination mobile station 3 designated by the host computer 17 is set in M. Step S106: frame No. To set. Step S107: Calculate the CRC and set the CRC bit. Step S108: The mobile station 3 receives one frame (fr0)
Send to the side.

Step S109: Frame number (fra
me No. ) Is updated. FIG. 5 is a flowchart showing an operation example of the mobile station side transmitting / receiving apparatus 4. Step S201: Corresponds to S101. Step S202: If YES, it is judged whether or not the transmission condition of the position data (whether or not the vehicle has traveled a certain distance since the last position data transmission, etc.) is met.

Step S203: If YES, the position data at that time is set in the "transmission / control data" bit (FIG. 3). Step S204: It is judged whether or not the transmitter switch (FIG. 24) is pressed by the operator. Step S205: If YES, the voice encoder 5 (see FIG.
Set the audio data from 4) to the "audio data" bit (Fig. 3).

Step S206: The associated data (empty vehicle / actual vehicle / coming vehicle) is set in the "associated data" bit (FIG. 3). Step S207: Corresponding to S105. Step S208: Corresponding to S106. Step S209: Corresponding to S107.

Step S210: Corresponds to step S108. After that, the frame No. To update. Now that the basic form of the present invention has been described, various embodiments will be described below. [First Embodiment] Under the first embodiment, the superframe sending means 30 sends non-voice data instead of voice data when there is no voice to be transmitted to the receiving side.

In the above-described basic form of the present invention, even if there is no voice signal to be transmitted to the mobile station 3 side in the base station 2, voice data corresponding to silence is transmitted, resulting in poor utilization efficiency of radio waves. . Therefore, in the first embodiment, when there is no audio data to be transmitted in the frames fr0 to fr2 of FIG. 3, instead of this, fr0 to fr2 are provided for transmitting non-audio data.

FIG. 6 is a diagram showing a frame configuration example based on the first embodiment. The column (1) in this figure shows the frames fr0 to fr2 as described above, but when there is no audio data, the non-voice data similar to the frame fr3 in the column (2) is sent out as fr0 to fr2. Therefore, 1-bit D / V indicating the distinction between audio data and non-audio data
It is preferable to include a bit, and particularly for non-voice data, it is preferable to include a frame attribute bit of, for example, 6 bits to indicate the type of the data.

As described above, the transmission frame generator 32
Generates non-voice data to be transmitted to the receiving side together with the voice data in addition to the voice transmission frame for transmitting the voice data, and the super frame generator 33 causes at least one non-voice data in the super frame SF. It can be inserted as a transmission frame for voice. Further, the transmission frame can further include a frame attribute bit indicating what kind of data is stored in the non-voice transmission frame.

It should be noted that additional data (accompanying data or M bits) that is distinguished from each information of audio and non-audio is included in the transmission frame for audio as 6-bit "accompanying data" shown in FIG. You can FIG. 7 is a flow chart showing an operation example of the base station side transmitting / receiving apparatus 12 under the first embodiment, and FIG. 8 shows an operation example of the mobile station side transmitting / receiving apparatus 4 under the first embodiment. It is a flowchart.

First, the points of operation in the first embodiment will be described. In the first embodiment, one D / V bit described above is arranged to distinguish between non-voice data and voice data, and 0 = voice and 1 = non-voice. Also,
Especially, in the case of non-voice data, the above-mentioned frame attribute bit is set to 6 to indicate what kind of data.
Place bits. In this example, 000000 = unspecified (because it is voice or the like, no attribute is specified), 000001 =
Notification signal (information for broadcasting operating parameters etc. from the base station 2 to the mobile station 3 all at once), 000010 = control signal, 00
0100 = position signal (uplink frame).

The frame number of the downlink frame. 0-2 is
When there is no voice transmission, the frame can be used for various purposes such as transmission of general information, the notification signal, and control. However, for simplification of description, only the notification signal is shown in this example.
Further, on the mobile station side, the transmission frame of the position data is set to the frame number. Only 3 (fr3) is used to simplify the operation example.

With such a configuration, the efficiency of use of radio waves for downlink frames becomes very good. Referring now to FIG. Step S301: Corresponds to S101. Step S302: Corresponding to S102.

Step S303: Since the transmission / control data is transmitted, the D / V bit is set to 1, that is, non-voice data. Step S304: The illustrated bit pattern indicating that the data is control data is set in the 6-bit frame attribute bit. Step S305: If the result of the step S301 is NO, it is judged whether or not the transmitter switch (FIG. 25) is pressed.

Step S306: If NO, this step is reached. This corresponds to step S102. Step S307: Corresponding to step S303. Step S308: In this example, since the above-mentioned notification signal is transmitted, the illustrated bit pattern is set in the 6-bit frame attribute bit.

Step S309: If the result of step S305 is YES, the data from the voice encoder 13 (FIG. 25) is set to the "voice data" bit. Step S310: Host computer 17 (FIG. 25)
Set the ancillary data from to the "accompanying data" bit. Step S311: The D / V bit is set to 0 indicating that it is a voice.

Step S312: In this case, since it is voice data, a 6-bit 0 pattern is set. Steps S313 to S317: correspond to S105 to S109, respectively. Next, referring to FIG. 8, steps S401 to S414.
For the most part corresponds to steps S201 to S210 in FIG.

The different steps are steps S404 and S.
405, S409 and S410, which are steps S303, S304, S311 and S3 in FIG.
Equivalent to 12. [Second Embodiment] In the second embodiment, basically, in addition to a voice transmission frame for transmitting voice data, non-voice data to be transmitted to a receiving side together with voice data is generated, and a superframe SF It is inserted as at least one non-voice transmission frame therein, and can further improve the transmission efficiency.

FIG. 9 is a diagram showing a frame configuration example based on the second embodiment. In the figure, columns (1) to (3) are frames fr0 to fr2 for voice data, and columns (4) are frames fr3 for non-voice data. In the frame configuration shown in FIG. 3, the accompanying data and the additional data such as M bits are individually included in each audio transmission frame.

However, in the frame structure shown in FIG. 9, additional data such as accompanying data to be individually included in each audio transmission frame is added to any one of the superframes, for example, the first audio transmission frame. I am trying to include them as a group. That is, in the above-described example, the M bits and the accompanying data which are individually included in the frames fr1 and fr2 are set to the head frame fr0
To be housed in a batch. This is these fr0-fr2
This is because (fr3) is bundled in one super frame SF and is not separated from each other.

Referring to FIG. 9, the accompanying data has 38 bits. This is 38 (= 18 + 20) bits, which is originally set by grouping three pieces of 6-bit associated data (18 bits) and collecting further M bits (20 bits) of each 10-bit frame fr1 and fr2. By using these 38 bits, it becomes possible to superimpose a more detailed vehicle allocation instruction while transmitting the voice in the downlink, and to superimpose position data on the voice in the near real time in the uplink.

According to the frame structure shown in FIG. 9, the following advantages can be further produced. As mentioned above, each frame is 1
It is standardized to 69 bits, but if the bit arrangement is as shown in this figure, exactly eight pieces of basic audio data 1 to 8 are embedded in three audio frames (fr0 to fr2) as shown in FIG. be able to. That is, each basic voice data can be embedded in a frame in the form of a voice basic unit in which voice of 20 mS is converted into 48-bit voice data based on the AMBE method described above.

As a result, the processing in the apparatus can be further simplified. FIG. 10 is a flowchart (No. 1) showing an operation example of the base station side transmitting / receiving apparatus 12 according to the second embodiment, and FIG. 11 is the same flowchart (No. 2). 12 is a flowchart (No. 1) showing an operation example of the mobile station side transmitting / receiving apparatus 4 according to the second embodiment, and FIG. 13 is the same flowchart (No. 2).

Since most of the flowcharts here are similar to the above-mentioned flowcharts, only steps different from the above-mentioned flowcharts will be extracted and described. Figure 1
In the flowcharts of FIGS. 0 to 13, from the viewpoint of the second embodiment, in order to prevent the transmission of audio frames of 2 frames or less, the audio transmission is always started at the frame fr0 including the additional bit and the audio transmission is completed. The frame is frame fr2. The initial value of the transmission status flag is OFF
And The transmission state flag corresponds to a bit of a register (not shown) that stores whether or not the transmission switch is pressed.

First, referring to FIGS. 10 and 11, in step S10, the transmission frame is the start frame fr0.
Then, it is determined whether the transmission switch (FIG. 25) is ON. In step S11, it is determined whether the transmission frame is the end frame fr2 and the transmission switch is OFF.

Steps S12 and S13 are as follows.
This is the case when the results of steps S10 and S11 described above are YES. Step S14 is reached when both the results of steps S10 and S11 described above are both NO, and the voice processing process and the non-voice processing process are respectively entered according to YES and NO of the result of step S14.

Next, referring to FIGS. 12 and 13, steps S20 to S24 are new steps, which correspond to the above-mentioned steps S10 to S14, respectively. [Third Embodiment] FIG. 14 is a diagram showing a frame configuration example based on the third embodiment. In the third embodiment, the error detection code CRC is added to the non-voice transmission frame (fr3), and the error detection code CRC is not added to the voice data in the voice transmission frame (fr0 to fr2). It is characterized by that. In other words, the audio data portion is excluded from the CRC applicable range. That is, the applicable range c of the error detection code CRC shown in FIG. 3 and the like is narrowed as shown by c1 in FIG. The reasons for doing so and the advantages of doing so are as follows.

In voice transmission, when an error is detected in a bit in a received frame on the receiving side, the data of the frame is discarded, and instead, the data of the previously received frame is filled and the voice decoder (6, 19) is used. Often sent to. This is so-called bad frame masking processing. However, actually, even if the audio data is sent to the audio decoder with some error, it does not cause a fatal deterioration in hearing. (I) On the other hand, when the error detection code CRC has the same detection code length (16 bits in FIG. 14), an error is detected when the length of data to be detected (c1 or c in FIG. 14) becomes long. The probability that you will not be able to do it will increase. (Ii) From the above two facts (i) and (ii), the structure of the frame for transmitting voice is set as shown in FIG. 14, and the voice data is excluded from the application range of the CRC for error detection. . This allows signals other than voice (non-voice data)
The probability of not being able to detect errors in
The reliability of the AVM system can be improved.

FIG. 15 is a flow chart showing the characteristics of the third embodiment. However, this figure shows a part of the flowchart of FIG. However, in the other flow charts described above, the same applies to the part that executes the CRC calculation. Step S31 in FIG. 15 is a characteristic part of the third embodiment, in which the CRC calculation applicable range of non-voice data bits is specified. [Fourth Embodiment] FIG.
FIG. 11 is a diagram showing an example of a frame structure based on the fourth embodiment.

In the fourth embodiment, a voice transmission frame (f
The error detection code CRC is added in r0 to fr2), and the error detection code CRC is added in the non-voice transmission frame (fr3).
Is added, and the data format of the data to which the corresponding error detection code is applied in each transmission frame is unified for all the transmission frames. The reasons for doing so and the advantages of doing so are as follows.

In the frame configuration of FIG. 14 (third embodiment), the bit configuration for error detection is such that <1> voice frame fr0, <2> voice frame fr1 and fr2, <
3> Three types of non-voice frame fr3 are created. Therefore, in the mobile station 3, the frame number. If it is not known, it is necessary to detect an error with the three types of formats applied to <1> to <3>.

As a result, the operation of the device becomes complicated. In addition, frame No. Even if it is found that the voice frame and the non-voice frame have different bit configurations, it is necessary to detect an error in two types of formats. In order to eliminate such inconvenience, the frame structure is changed to that shown in FIG.
Configure as follows. As a result, all frames (fr
0 to fr3) can have a common bit configuration for error detection (see cc in the figure; all 57 bits).
Therefore, the device is simplified.

By adopting such a configuration, the first CRC
If an error is detected in the bits up to, the frame No. of the frame is determined. And D / V enable processing according to the respective bit configurations. Even if an error is detected in the bits up to the first CRC, the frame No. of the immediately preceding frame. Is already known, the frame No. of the frame immediately after that is determined. Since it can be estimated that there is a high possibility that the voice data may contain an error, there is no great inconvenience if it is sent to the voice decoder as it is.

In order to realize such unification of the data formats for CRC, in the fourth embodiment, 1 is set.
Two ideas have been added. That is, in the voice transmission frame (fr1 and fr2), by adding a part of voice data to the data to which the error detection code CRC is applied, the data format of the voice transmission frame is changed to non-voice. Transmission frame fr3
It is to be unified with the data format of. The part of the audio data added as described above is specifically the audio data 3 and the audio data 6 in the columns (2) and (3) of FIG.

In this way, in the audio frames fr1 and fr2, there is a demerit that the error detection capability is certainly reduced by the addition of the audio data 3 and 6. On the other hand, however, the merits of unifying the formats into one type are far greater. For example,
This is an advantage that the software in the device can be simplified. As for the non-voice frame fr3, the error detection can be divided into two blocks and detected (see FIG. 16).
(See cc and cc 'in column (4)), the error detection capability can be further enhanced.

The flow chart according to the fourth embodiment is exactly the same as the above-mentioned flow charts, and therefore its explanation is omitted. However, step S31 in the flowchart shown in FIG. 15 is not necessary. This is because the calculation range in step S31 is constant as described above. The present invention forms a superframe SF by setting the voice frames fr0 to fr2 and the non-voice (control) frame fr3 shown in FIG. 3 as one set, and continuously transmits the superframe SF. Utilizing such a configuration skillfully enables the following application examples. [Fifth Embodiment] FIG. 17 is a configuration diagram of a transmission frame for explaining the fifth embodiment.

Column (1) of the figure shows the above-mentioned basic form and the first
~ It is common to the fourth embodiment and represents an actual transmission frame. In the column (1), the field indicated as "signal body" is the frame fr described so far.
It corresponds to 0 to fr3. However, in the actual transmission frame, the rising and falling ramp times RAMP1 and RAMP2, which are indispensable for digital modulation, and the synchronization signal SYN.
C and guard time GUARD are arranged with the numbers of bits shown in the figure. The "signal body" is arranged with the bit number 348. As I mentioned at the beginning,
Although it has been described that all the frames are unified into 169 bits, in actuality, a bit string subjected to error correction coding is added to the 169 bits for transmission. This is 34
It is an 8-bit signal body.

Next, referring to the column (2) of FIG. 17, this is the transmission frame adopted in the fifth embodiment, more specifically, the transmission frame based on the above-mentioned non-voice frame fr3. The fifth embodiment is characterized in that in a superframe SF generated by modulating a carrier, one transmission frame in this superframe SF is an unmodulated carrier, and optimally, this is The transmission frame carrying the unmodulated carrier is the non-voice transmission frame (fr3).

The background to the birth of the fifth embodiment of the present invention is as follows. In the GPS-AVM system or the like, mobile stations may call each other. For example,
This is the case when it is necessary to communicate with a mobile station in the vicinity when it is out of the coverage area of the base station. In the communication between the base station 2 and the mobile station 3, in the case of a semi-duplex system in which the base station 2 is constantly transmitting,
The mobile station may automatically perform frequency control on the frequency of the base station and follow the frequency. At this time, since the base station is a fixed station, its transmission frequency accuracy is generally set high.

However, the frequency deviation of the mobile station is generally set to be gentle from the viewpoint of cost and space.
Therefore, when a call is made between the mobile station and the mobile station as described above, the frequency deviation between them becomes further large,
Receiving performance may be degraded, and sometimes reception may not be possible. Also, since the mobile station suddenly transmits a frame only when the mobile station itself speaks, the mobile station of the other party performs automatic control at high speed at the beginning of the call to match the transmission frequency, and within a short time. The problem arises that the reception frequency of the own station must be followed.

As a solution to this problem, in the fifth embodiment,
In the superframe structure of the above-described embodiments, paying attention to the frame fr3 in which a voice transmission space is generated, a carrier without digital modulation, that is, an unmodulated carrier is inserted into this frame and transmitted to the mobile station of the other party. . The reason why the non-modulation carrier is used is clear from FIG. FIG. 18 is a spectrum diagram for explaining the fifth embodiment.

This figure shows an unmodulated carrier and a modulated carrier digitally modulated with voice data / non-voice data. As is clear from the figure, the spectrum of the modulated carrier is wide. In contrast, the spectrum of unmodulated carrier is very narrow. Therefore, in the mobile station on the receiving side, it is possible to pull in the frequency much faster by receiving an unmodulated carrier having a narrow spectrum than by a modulated carrier having a wide spectrum, which is difficult to follow the frequency.

Thus, if the mobile station on the transmission side outputs the non-modulated carrier of FIG. 18 at the timing of frame fr3 in the superframe SF, the mobile station on the receiving side can quickly transmit the non-modulated carrier in the received frame fr3. The frequency control circuit can perform frequency pull-in.
More preferably, a non-voice transmission frame (frame fr3) that carries an unmodulated carrier is arranged at the beginning of the superframe SF. As a result, the activation timing of the frequency control circuit can be further advanced.

FIG. 19 is a flowchart (No. 1) showing an operation example of the mobile station side transmitting / receiving apparatus 4 based on the fifth embodiment, and FIG. 20 is the same flowchart (No. 2). Most of the flowcharts shown in FIGS. 19 and 20 are almost the same as the above-mentioned flowcharts. The only difference is steps S41 and S42 unique to this embodiment.

In step S41, when it is determined that the frame is fr3 in the previous step, it is determined whether the communication between mobile stations is started and the transmission switch (FIG. 24) is pressed. In step S42, the determination result is Y.
At the time of ES, the above-mentioned unmodulated carrier is added to the frame fr3
, And transmits one frame to the receiving side mobile station. After that, several frames are transmitted, and when a response signal is returned from the mobile station on the receiving side, a frame fr3 carrying normal control data is transmitted instead of the unmodulated carrier.

With the above arrangement, it becomes easy to make the other station follow the call at high speed even in a call between mobile stations. [Sixth Embodiment] Finally, a sixth embodiment will be described. The sixth embodiment is an improvement over the fifth embodiment with respect to synchronization protection.

FIG. 21 is a transmission frame configuration diagram for explaining the sixth embodiment. In this figure, FIG.
The sync signal SYNC, which is not found in the embodiment, is incorporated. That is, in the sixth embodiment, the synchronization signal SYNC (2
It is characterized by including 0 bit).

The background of the need for the sixth embodiment will be described below. In general, when receiving a signal having a continuous frame structure, the timing of the synchronization symbol of the currently received frame is confirmed from the timing of the synchronization symbol of the previously received frame. When the timing of the sync symbol cannot be confirmed due to fading or the like, the sync protection is executed by inferring from the previous frame to demodulate the sync symbol (for example, Japanese Patent Laid-Open No. 7-16247).
(See No. 3: Synchronization protection method for digital communication).

However, in the method of the fifth embodiment described above, there is no synchronization signal when receiving an unmodulated carrier, and synchronization protection cannot be applied. That is, once every four frames, the synchronization protection is skipped at the frame fr3, and the front protection is weakened. In order to solve this, an unmodulated carrier is transmitted after the synchronization symbols are arranged. FIG. 21 shows the structure of this frame.

As a result, it is possible to secure synchronization protection during transmission of the unmodulated carrier even in the communication between mobile stations.

[0093]

As described above, according to the present invention, a new transmission system which has not been available in the conventional mobile communication system is realized, and by this transmission system, the base station and each mobile station constituting the system are realized. The hardware configuration and software of the transceiver device can be greatly simplified. Therefore, the economical efficiency of the system is greatly improved.
Further, the transmission efficiency of both the downlink frame and the uplink frame is improved, and the operation efficiency of the system is also improved as compared with the conventional one.

This transmission method can be applied to communication between mobile stations, and practical inter-mobile station communication can be easily realized by inserting an unmodulated carrier into a specific frame.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a basic configuration of a transmission / reception device according to the present invention.

FIG. 2 is a diagram showing an example of a frame structure output from a super frame sending means 30.

FIG. 3 is a diagram specifically showing a configuration of each frame fr shown in FIG.

FIG. 4 is a flowchart showing an operation example of the base station transceiver device 12.

FIG. 5 is a flowchart showing an operation example of the mobile station side transmitting / receiving apparatus 4.

FIG. 6 is a diagram showing an example of a frame structure based on the first embodiment.

FIG. 7 is a transceiver apparatus 12 on the base station side according to the first embodiment.
5 is a flowchart showing an operation example of FIG.

FIG. 8 is a flowchart showing an operation example of the mobile station side transmitting / receiving apparatus 4 under the first embodiment.

FIG. 9 is a diagram showing a frame configuration example based on a second embodiment.

FIG. 10 is a transceiver apparatus 1 on the base station side according to the second embodiment.
6 is a flowchart (No. 1) showing an operation example of No. 2;

FIG. 11 is a base station side transceiver device 1 according to the second embodiment.
6 is a flowchart (No. 2) showing an operation example of No. 2;

FIG. 12 is a transmission / reception device 4 on the mobile station side according to the second embodiment.
5 is a flowchart (No. 1) showing an operation example of FIG.

FIG. 13 is a transmission / reception device 4 on the mobile station side according to the second embodiment.
3 is a flowchart (No. 2) showing an operation example of FIG.

FIG. 14 is a diagram showing an example of a frame structure according to the third embodiment.

FIG. 15 is a flowchart showing the features of the third embodiment.

FIG. 16 is a diagram showing an example of a frame structure according to the fourth embodiment.

FIG. 17 is a configuration diagram of a transmission frame for explaining the fifth embodiment.

FIG. 18 is a spectrum diagram for explaining the fifth embodiment.

FIG. 19 is a flowchart (No. 1) showing an operation example of the mobile station side transmitting / receiving apparatus 4 according to the fifth embodiment.

FIG. 20 is a flowchart (No. 2) showing an operation example of the mobile station side transmitting / receiving apparatus 4 based on the fifth embodiment.

FIG. 21 is a configuration diagram of a transmission frame for explaining the sixth embodiment.

[Fig. 22] Fig. 22 is a diagram illustrating a general frame configuration example in a mobile communication system using a digital modulation method.

FIG. 23 is a diagram showing a schematic configuration of a GPS-AVM system.

FIG. 24 is a diagram showing a configuration example of a mobile station side transmitting / receiving device 4 in the GPS-AVM system.

FIG. 25 is a diagram showing a configuration example of a base station side transmitting / receiving device 12 in the GPS-AVM system.

FIG. 26 is a diagram showing a frame configuration example according to a first conventional example.

[Explanation of symbols] 1 ... GPS-AVM system 2 ... Base station 3 ... Mobile station 4 ... Transceiver 5 ... Voice encoder 6 ... Voice decoder 7 ... Control unit 8 ... Digital modulator / demodulator 9 ... Transceiver 12 ... Transceiver 13 ... Voice encoder 14 ... Transmission control unit 15 ... Digital modulator 16 ... Transmitter 17 ... Host computer 19 ... Voice decoder 20 ... Reception control unit 21 ... Digital demodulator 22 ... Receiver 23 ... Reservation not possible table 30 ... Super frame sending means 31 ... Voice data generator 32 ... Transmission frame generation unit 33 ... Super frame generation unit

Continued front page    F term (reference) 5K028 AA11 BB04 DD01 DD02 EE02                       KK12 MM05                 5K067 AA21 AA41 BB03 BB21 DD17                       DD20 DD51 EE02 EE10 FF03                       GG00 HH22 JJ52 JJ56 JJ61                       KK13 KK15

Claims (4)

[Claims] 1. A mobile device having superframe sending means for accommodating data to be transmitted to a receiving side divided into a plurality of frames each having the same time length, and assembling a series of n frames into a superframe and transmitting the superframe. In the transceiver for body communication, a voice data generation unit that generates voice data by encoding voice corresponding to the time length of the superframe is provided, and the superframe sending unit outputs the voice data,
A transmission / reception device for mobile communication, wherein the transmission / reception device allocates to each of the frames exceeding (n / 2) and (n-1) or less and transmits the frames. 2. The transmission / reception device for mobile communication according to claim 1, wherein a gradually increasing frame number is given to each of the frames in order of the transmission time of the frame. 3. The transceiver for mobile communication according to claim 2, wherein the frame number is circulated for each superframe. 4. The superframe transmitting means allocates the audio data to a group of continuous frames of (n / 2) or more and (n-1) or less and arranges them for transmission. The transmitter / receiver for mobile communication according to claim 1.