JP2002135196A - Reception device for mobile communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitting/receiving device wherein the device configuration is simplified, while the transmission efficiency of up/down frame is enhanced for efficient system management, related to a mobile communication system. SOLUTION: There are provided a voice data generating part 31, which generates a voice frame in which a voice data, coded for each prescribed cycle T1 is housed, a transmission frame generating part 32 which generates a plurality of transmission frames each of which has a prescribed cycle T2 longer than the prescribed cycle T1, while a voice having the length of a super frame SF is allocated as voice data shorter than that acquired from the voice data generating part 31, and a super frame generating part 32, which arranges a transmission frame having a prescribed cycle T3 of a length which is n times that of the prescribed cycle T2, with 2 to n-1 of voice data in it, for transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art At present, various types of mobile communication systems are widely and practically used. However, the system of the present invention described below includes a mobile station mounted on an automobile (such as a taxi) and a base station. An example of a dispatch system is shown in which a station (such as a dispatch center) grasps the position and dynamics of each mobile station (the state of an empty vehicle / actual vehicle / pick-up vehicle) and issues dispatch instructions to each mobile station. More specifically, GPS-AVM (Global Positioning)
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 dispatch center of the position data by itself. The current dispatch system is based on this GPS-AVM system.
Systems are becoming mainstream.

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

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,
-An AVM system will be described as an example. In the figure, reference numeral 1 indicates, for example, a GPS-
Base station 2 which is an AVM system and serves as a dispatch center
And a plurality of mobile stations (1 to n) 3 mounted on a car (such as a taxi) and communicating wirelessly with the base station 1.

[0005] Transmission is performed from the base station 2 at a frequency f2 in a semi-duplex system. That is, even when there is no data to be transmitted, transmission is always performed by arranging some data in each frame. On the other hand, the mobile station 3 can grasp the timing of each frame. From the mobile station 3, the frequency f
1, transmission is performed, but whenever there is data to be transmitted to the base station 2, the data is transmitted in synchronization with the timing of each frame. Further, each time the mobile station 3 is designated by the base station 2, only at that time, the mobile station 3 transmits required data to the base station 2 in synchronization with the timing of each frame.

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

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

[0008] A signal from the base station 2 is received by the transmission / reception section 9 via a base station communication antenna. After the received signal is demodulated by the digital modulator / demodulator 8, the content is reproduced by the control unit 7. If it is determined that the content is audio data, the bit string is decoded by the audio decoder 6 and output from the speaker as original audio. When it is determined that the data is vehicle allocation data addressed to the own station, the data is displayed on the data display unit 10.

On the other hand, when transmitting voice from the mobile station 3 to the base station 2, the operator presses the transmission switch (ON) and inputs from the microphone. This input speech is encoded by the speech encoder 5 and converted into a bit string. The control unit 7 receives this signal, adds a code indicating that it is a voice, and sends it to the digital modulator / demodulator 8. Here, the signal is modulated into a predetermined format and transmitted from an 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 every time the distance from the previous position data transmission exceeds a certain linear distance. On the other hand, the configuration on the base station side is as follows. FIG. 25 shows GP
FIG. 2 is a diagram illustrating a configuration example of a base station side transmission / reception device 12 in the S-AVM system.

In the transmission / reception device 12 shown in FIG. 1, when a transmission switch is pressed by an operator and voice is input from a microphone, the voice is modulated by a digital modulator 15 and transmitted from a transmission unit 16 to the mobile station 3 via an antenna. And transmitted as a downstream frame. In addition, the dispatching data from the base station 2 is input by the operator operating the client 18, and the host computer 17 having received the data is transmitted through the transmission control unit 14 in the same manner as in the case of the input voice described above.
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 by the above-mentioned arbitrary transmission method is received by the receiving section 22 via the antenna, the digital demodulator 2
At 1, demodulation is performed as the original position data. If the reception control unit 20 finds that this is not audio information but positional information, it is input to the host computer 17 and sent to the client 18.

On the other hand, if the demodulation reveals that the speech information is the speech information, the speech decoder 19 reproduces the original speech and outputs it from the speaker to the operator. The object of the present invention relates particularly to the frame shown in FIG. FIG. 26 is a diagram showing a frame configuration example according to the first conventional example. This first conventional example is disclosed in Japanese Patent Application No.
-035672. Here, the synchronization signal, error correction bits, rising and falling ramp times, guard time, and other bits required for the digital modulation method are
The description is omitted for simplification.

Also, here, generally used,
Assuming a frame length of 40 ms and a transmission amount excluding the above omitted bits from the total transmission amount of 9600 BPS, the transmission amount of one frame (including the error detection code) is 16
It has 9 bits. Hereinafter, the description will be made unified to the 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 discriminating whether the subsequent voice / non-voice data portion is voice data or non-voice data, and the voice / non-voice data contains each content of voice data or non-voice data. I do.

Looking at the audio data, AMB, which is currently considered to have the highest compression rate among the audio encoding systems,
An example in which the E method (AMBE: Advanced MultiBand Excite (DVSI, USA)) is adopted will be described. According to the AMBE method, audio is processed with an audio frame every 20 ms as one unit, and 48-bit compressed audio data is generated per unit. In FIG. 26, the audio data is AMBE
As an audio signal for 40 ms (2 × 20 ms), 9
It is generated and allocated in 6 bits.

The control data (46 bits) following the 96 bits is a response signal to the transmission signal of the above-mentioned arbitrary transmission method in the upstream frame. The CRC (16 bits) following the control data is an error detection code for discarding the data when an error during transmission is detected. In FIG. 26, the slender part c has its CRC calculation
M, D / V, voice / non-voice data and control data. That is, the CRC is added to detect a bit error from these entire bit ranges.

For example, in a GPS-AVM system applied to a taxi dispatch system, in the frame configuration shown in FIG. 26, the downlink non-voice data includes dispatch data (usually a plurality of frame lengths), a response signal (single frame), and the like. On the other hand, the uplink non-voice data contains the position data (single frame), dynamic data (single frame), and the like of the mobile station 3 respectively.

According to the first conventional example described with reference to FIG. 26, the frame can be applied to the downlink transmission signal, but cannot be applied to the uplink transmission signal. There is a disadvantage that the efficiency cannot be improved. As a device that can avoid this disadvantage, there is a second conventional example by the present applicant. This is Japanese Patent Application No. 11-214275. Here, a transmission frame of another cycle is created by compressing the audio frame. By using this new transmission frame, even when a certain mobile station is transmitting an uplink signal, other mobile stations can transmit data of the uplink signal.

[0019]

In the second conventional example,
The first aspect proposes changing the frame length between an upstream frame and a downstream frame. For example, (i) reception of 20 ms and transmission of 20 ms, and (ii)
Transmission such as reception of 30 ms and transmission of 30 ms.

However, in this case, there is a first problem that the program in the case (i) and the program in the case (ii) are required, and the processing becomes complicated. In addition, since the base station 2 and each mobile station 3 must hold separate 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. .

[0021] Further, even if another mode other than the above-mentioned first mode of the second conventional example is adopted, the transmission timing of the transmission frame is set to the voice frame length because the voice frame length and the transmission (non-voice) frame length are different. Must be synchronized in units of a plurality of frames, and the same problem as the third problem occurs. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mobile communication transmitting / receiving apparatus that can significantly improve the operation efficiency of a system in view of the above problems.

More specifically, in a mobile communication system such as a GPS-AVM system, transmission timing can be easily set, so that the configuration of the transmission / reception device can be simplified and the cost can be reduced. It is an object of the present invention to improve the signal transmission efficiency even for upstream frames. It is another object of the present invention to enable efficient communication not only between a base station and each mobile station but also between a mobile station and a mobile station.

[0023]

FIG. 1 is a diagram showing an example of a basic configuration of a transmission / reception apparatus according to the present invention. The configuration of the transmission / reception apparatus according to the present invention is substantially the same for each mobile station apparatus (4) and the base station apparatus (12). The transmission / reception devices 4 and 12 are provided with a superframe transmission unit 30.
Having. The superframe transmitting means 30 stores the data (IN) to be transmitted to the receiving side in a plurality of frames each having the same time length, and assembles a series of plural frames into a superframe and transmits (OUT). .

As shown in the lower part of FIG. 1, the super frame transmitting means 30 can be composed of an audio data generating unit 31, a transmission frame generating unit 32, and a super frame generating unit 33, for example. These generators will be described later in detail. FIG. 2 is a diagram showing a configuration example of a frame output from the super frame transmitting means 30.

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

One of the features of the present invention is that the second conventional example has a different frame length between the upstream frame and the downstream frame, but has a common frame structure. The following is 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. Downlink superframe SF (downlink) to mobile station 3 and uplink superframe SF from mobile station 3 to base station 2
(Up) is the same frame configuration.

Thus, the above-mentioned first, second and third problems are basically solved. In this case, the same frame fr
The above-mentioned feature that a plurality of are grouped into a super frame SF is considered to be seemingly similar to the TDMA technology used in general digital mobile phones. However, this is different from the TDMA technology. This will be described later.

[0028]

FIG. 3 shows each frame fr shown in FIG.
FIG. 3 is a diagram specifically showing the configuration of FIG. Throughout the drawings, similar components are denoted by the same reference numerals or symbols. In FIG. 3, frame 0 to frame 2 3 in FIG.
The frames are shown in column (1) as fr0 to fr2, and FIG.
Frame 3 is shown in column (2) as fr3. In the figure, "M" (mobile station number), "voice data" and "CRC"
And "c" are the same as those described in FIG.
Non-speech data is indicated as "transmission / control data". The “associative data” can be used in a down frame when giving a simple instruction to a taxi crew. In the case of an upstream frame, it can be used for notification of the dynamic state described above.

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

As a result, a space for transmitting audio data is created in the last frame fr3, and the transmission / control data, which is non-voice data, can be accommodated in this empty area. Looking further at the bit arrangement in each frame fr, in FIG. 3, first, “frame No.”
Is a two-bit "M" to distinguish the four frames
Is 10 bits sufficient to identify about 1000 taxis (mobile stations), and "combined data" is 13 bits sufficient to notify
"C" has 16 bits as in FIG.

Looking at the "voice data", as described above, the voice for 160 ms is converted into three frames fr0 to fr.
2, the audio data is 53.333.
(= 160/3) mS. Also, as described above, in the AMBE method, 20 ms of audio is converted into 48-bit audio data, so the audio data (53.
333 ms) is 128 (= 48 × 160/20) bits, and each of the frames fr0 to fr2 is unified to 169 bits 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 on a downstream frame and transmitted. In the uplink frame, when a certain mobile station 3 transmits a voice, the voice data is not transmitted in the frame fr3 in the superframe SF transmitted from the mobile station. Therefore, non-voice data (transmission data) can be transmitted to the base station 2 in this frame fr3. Moreover, since the same frame period of 40 ms is used for both the upstream frame and the downstream frame, the device configuration of the transmission / reception devices 4 and 12 is simplified.

Reference is now made to FIG. 3 and the lower part of FIG. The three generators 31, 32, and 33 of FIG. 1 that constitute the superframe transmitting means 30 operate as follows. The audio data generation unit 31 converts the audio to be transmitted to the receiving side into the first
Is generated as an audio frame accommodating the encoded audio data at every predetermined period T1 (corresponding to 20 ms described above).

The transmission frame generator 32 outputs a second predetermined period T2 (the above-described 40 seconds) longer than the first predetermined period T1.
mS) corresponding to the time length (160 mS) of the superframe SF, and the shorter audio data (128 bits) obtained from the audio data generator 31. A plurality of transmission frames (fr0 to fr3) to be allocated are generated.

The superframe generating section 33 is a superframe SF having a third predetermined period T3 (160 ms) having a length n times (for example, n = 4) times the second predetermined period T2, and the audio data is Two or more and (n-1) or less transmission frames (three transmission frames in FIG. 3) are arranged in the SF and transmitted. Here, "2 or more and (n-1)
The reason for expressing it as “the following transmission frame” is based on the TDM described above.
A description will be given while clarifying the difference from the technology A.

As described above, the present invention has similarities to the TDMA technology used in digital mobile phones, but the TDMA technology uses a wider band to increase the amount of transmission, and accordingly, the time required is N. This is a method for configuring a divided transmission path. Therefore, a voice frame has a transmission slot having a length of 1 / N, and a unit of N transmission slots is called a frame.

On the other hand, according to the present invention, the band is limited (narrow band) and the transmission amount per carrier (f1 or f2 in FIG. 23) is limited to the case where the control signal is added by encoding the voice. Providing a more efficient transmission scheme when close to volume. In this respect, it is essentially different from TDMA technology. In order to clarify this point in the superframe generation unit 33, the above-described expression “2 or more and (n−1) or less transmission frames” is used.

Next, an example of the operation of the transmitting / receiving apparatuses 4 and 12 according to the present invention will be described. FIG. 4 is a flowchart illustrating an operation example of the base station side transmitting / receiving device 12. First, the points of the operation will be described. This also applies to other flowcharts described below. In the present invention, since an emphasis is placed on an air format for executing efficient transmission and control, a flowchart for only generation of a transmission signal is shown, and a flowchart for reception is omitted. These flowcharts are executed for each frame as interrupt processing for each frame. Note that the frame No. (Frame
No. ) Is set to 0 as an initial value.

In the operation example of the base station 2 shown in FIG. 1 and FIG. 3, the frame No.
0 to 2 (fr0 to fr2), the sound is output to the frame No.
In 3 (fr3), transmission data or control data is transmitted. Frame No. Is managed by the base station 2 and 0 → 1 → 2
→ 3 → 0 →... To form a superframe SF.

On the receiving side, the frame No. , To discriminate between voice and data, and proceed with the processing. In the mobile station 3, the frame No. Is the frame number transmitted from the base station 2. The frame correspondence of the downstream frame / upstream frame and the upstream transmission timing are separately defined. Therefore, the transmission frame No. Is generated from the received data. For example, the frame No. of the upstream frame to be transmitted. .. Are the frame numbers of the received downstream frames. Are generated from 0, 1... With a delay of a predetermined time.

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

In the mobile station 3, the frame No. If the transmission switch is pressed in the case of No. 0 to 2, the audio signal is transmitted to the frame No. In the case of 3, when a specified transmission condition such as traveling a certain distance from the previous position data transmission is satisfied,
Sends position data. Please refer to FIG. Step S101: It is determined whether it is the transmission timing of the frame fr3.

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

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

Step S109: Frame number (fra
me No. ) To update. FIG. 5 is a flowchart showing an operation example of the mobile station side transmitting / receiving device 4. Step S201: corresponds to S101. Step S202: If YES, it is determined whether or not the transmission condition of the position data (for example, whether the vehicle has traveled a fixed distance since the previous transmission of the position data) matches.

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

Step S206: The associated data (vacant / real / intercepting vehicle) is set in the "associated data" bit (FIG. 3). Step S207: corresponds to S105. Step S208: corresponds to S106. Step S209: corresponds to S107.

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

In the above-described basic form of the present invention, even when there is no audio signal to be transmitted to the mobile station 3 side in the base station 2, audio data corresponding to silence is transmitted, and radio wave utilization efficiency is poor. . Therefore, in the first embodiment, when there is no audio data to be transmitted by the frames fr0 to fr2 in FIG. 3, fr0 to fr2 are provided in place of the audio data to transmit non-audio data.

FIG. 6 is a diagram showing an example of a frame configuration based on the first embodiment. The column (1) in this figure is the frames fr0 to fr2 as described above, but when there is no audio data, non-audio data similar to the frame fr3 in the column (2) is transmitted 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 in the case of non-voice data, it is preferable to include a frame attribute bit of, for example, 6 bits for indicating the type of the data.

As described above, the transmission frame generation unit 32
Generates the 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 generation unit 33 generates at least one non-voice data in the super frame SF. It can be inserted as a transmission frame for voice. The transmission frame can further include a frame attribute bit indicating what type of data the non-voice transmission frame contains.

In the transmission frame for voice, additional data (associated data and M bits) which are distinguished from voice and non-voice information should be included as 6-bit "associated data" shown in FIG. Can be. FIG. 7 is a flowchart showing an operation example of the base station side transmission / reception device 12 under the first embodiment, and FIG. 8 shows an operation example of the mobile station side transmission / reception device 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 non-speech data from speech data, and 0 = speech and 1 = non-speech. Also,
In particular, in the case of non-speech data, the above-described frame attribute bits are set to 6 to indicate what kind of data, etc.
Place bits. In this example, 000000 = unspecified (the attribute is not specified because it is a voice etc.), 000001 =
Broadcast signal (information for simultaneously broadcasting operation parameters and the like from base station 2 to mobile station 3), 000010 = control signal, 00
0100 = position signal (uplink frame).

The frame number of the downstream frame 0-2
When there is no voice transmission, the frame can be used for various purposes, such as using the frame for transmitting general information, using the above-mentioned notification signal, and further using it for control and the like. However, for simplification of the description, only the notification signal is shown in this example.
Further, the mobile station sets the transmission frame of the position data to the frame No. 3 (fr3) only to simplify the operation example.

With such a configuration, the use efficiency of radio waves for downstream frames is significantly improved. Reference is now made to FIG. Step S301: corresponds to S101. Step S302: corresponds to S102.

Step S303: In order to transmit the transmission / control data, the D / V bit is set to 1, that is, non-voice data. Step S304: Set the illustrated bit pattern representing the control data in the 6-bit frame attribute bits. Step S305: If the result of step S301 is NO, it is determined whether or not the transmission switch (FIG. 25) is pressed.

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

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

Step S312: In this case, since it is audio 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
Mostly corresponds to steps S201 to S210 in FIG.

The different steps include steps S404 and S404.
405, S409 and S410, which are steps S303, S304, S311 and S3 in FIG.
Equivalent to 12. [Second Embodiment] The second embodiment basically generates non-voice data to be transmitted to the receiving side together with voice data in addition to a voice transmission frame for transmitting voice data. It is inserted as at least one non-voice transmission frame therein, thereby making it possible to further increase the transmission efficiency.

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

However, in the frame configuration 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. They are included as a whole. That is, in the above-described example, the M bits and accompanying data individually included in the frames fr1 and fr2 are replaced by the first frame fr0
Housed in a lump. This is because fr0-fr2
It is noted that (fr3) is united in one superframe SF and does not fall apart from each other.

Referring to FIG. 9, the accompanying data has 38 bits. This is originally 38 (= 18 + 20) bits in which 6 bits of accompanying data are grouped together into 3 pieces (18 bits) and M bits (20 bits) of 10 bits of frames fr1 and fr2 are further collected. Using these 38 bits, it is possible to superimpose a more detailed vehicle allocation instruction while transmitting voice on the downstream, and to superimpose position data on the voice almost in real time on the upstream.

According to the frame configuration shown in FIG. 9, the following advantages can be further obtained. As mentioned above, each frame is 1
Although it is unified to 69 bits, if the bit arrangement is as shown in this figure, exactly eight pieces of basic audio data 1 to 8 are embedded without gaps in three audio frames (fr0 to fr2) as shown. be able to. That is, each basic audio data can be embedded in a frame in the form of a basic audio unit obtained by converting 20 ms audio into 48-bit audio data based on the above-mentioned AMBE method.

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

Most of the flowchart here is the same as the above-mentioned flowchart, and therefore, only steps that are particularly different from the above-mentioned flowchart will be described. FIG.
In the flowcharts of FIG. 1 to FIG. 14, in order to prevent the transmission of audio frames of 2 frames or less from the viewpoint of the second embodiment, the audio transmission must be started at the frame fr0 including the above-mentioned additional bits, and the audio transmission ends. 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) for storing that the transmission switch is not pressed or not pressed.

First, referring to FIGS. 10 and 11, in step S10, the transmission frame is the start frame fr0.
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 performed by
This is the case where the results of steps S10 and S11 are YES. The process proceeds to step S14 when both the results of steps S10 and S11 are NO, and the process enters the voice processing process and the non-voice processing process, respectively, in response 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 steps S10 to S14, respectively. [Third Embodiment] FIG. 14 is a diagram showing an example of a frame configuration based on the third embodiment. In the third embodiment, an error detection code CRC is added to a non-speech transmission frame (fr3), and a portion (D / V, M, associated data) other than speech data in a speech transmission frame (fr0 to fr2) is added. Data, etc.) to which an error detection code CRC is added. In other words, the audio data portion is excluded from the CRC application range. That is, the application range c of the error detection code CRC shown in FIG.
Narrow as shown. The reasons for doing so and the advantages thereof 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 that frame is discarded, and the data of the previously received frame is filled in instead, and the voice decoder (6, 19) Is often sent to This is a so-called bad frame masking process. However, even if the audio data is actually sent to the audio decoder with a certain amount of error included, no audible fatal deterioration occurs. (I) On the other hand, if the error detection code CRC has the same detection code length (16 bits in FIG. 14), an error is detected if the length of data to be detected (c1 or c in FIG. 14) becomes long. The probability of being unable to do so increases. .. (Ii) Based on the above two facts (i) and (ii), the configuration of the frame for transmitting voice is as shown in FIG. 14, and voice data is excluded from the application range of CRC for which error detection is to be performed. . This allows signals other than voice (non-voice data)
GPS-
The reliability of the AVM system can be improved.

FIG. 15 is a flowchart showing the features of the third embodiment. However, this drawing shows a part of the flowchart of FIG. However, in the other flowcharts described above, the same applies to the part that executes the CRC calculation. Step S31 in FIG. 15 is a characteristic portion of the third embodiment, and here, a CRC calculation applicable range of non-speech data bits is specified. [Fourth Embodiment] FIG. 16 is a diagram showing an example of a frame configuration based on the fourth embodiment.

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

In the frame configuration of FIG. 14 (third embodiment), the bit configuration of the error detection is as follows: <1> voice frame fr0, <2> voice frames fr1 and fr2, <
3> There are three types of non-voice frames fr3. For this reason, the mobile station 3 sets the frame No. Is not known, it is necessary to detect errors in the three types of formats applied to the above <1> to <3>.

As a result, the operation of the device becomes complicated. Also, the frame No. However, since the bit configuration is different between the voice frame and the non-voice frame, it is necessary to detect errors in two types of formats. In order to eliminate such inconvenience, the structure of the frame is changed as shown in FIG.
It is configured as follows. As a result, all frames (fr
0 to fr3), a common bit configuration for error detection (see cc in the figure; 57 bits for each).
This leads to simplification of the device.

By adopting such a configuration, the first CRC
If an error is detected in the bits up to bit No. and it is determined that there is no error, the frame No. And D / V can be processed according to their respective bit configurations. Note that even when an error is detected in bits up to the first CRC, the frame number of the immediately preceding frame is determined. Is already known, the frame number of the frame immediately after that is determined. Since it can be estimated, there is a high possibility that the speech data contains an error, but even if the speech data is sent to the speech decoder as it is, no serious inconvenience occurs.

To realize such unification of the data format for CRC, the fourth embodiment employs 1
One ingenuity has been added. That is, by adding a part of voice data to the data to which the error detection code CRC is applied in the voice transmission frame (fr1 and fr2), the data format of the voice transmission frame is changed to non-voice. Transmission frame fr3 for
The data format is unified. 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 manner, in the audio frames fr1 and fr2, there is a disadvantage that the error detection capability certainly decreases due to the addition of the audio data 3 and 6. On the other hand, however, the merits of unifying the format into one type are far greater. For example,
This is advantageous in that software in the device can be simplified. Further, regarding the non-voice frame fr3, since error detection can be detected by dividing it into two blocks (FIG. 16)
(See cc and cc 'in column (4).) The error detection capability can be further enhanced.

The flowchart based on the fourth embodiment is exactly the same as the above-mentioned respective flowcharts, and will not be described. However, step S31 in the flowchart shown in FIG. 15 is not particularly necessary. This is because the calculation range in step S31 is constant as described above. According to the present invention, a superframe SF is formed by using the audio frames fr0 to fr2 and the non-audio (control) frame fr3 shown in FIG. 3 as one set, and these SFs are continuously transmitted. If such a configuration is skillfully used, the following applied embodiments are possible. [Fifth Embodiment] FIG. 17 is a diagram showing the structure of a transmission frame for explaining a fifth embodiment.

[0107] The column (1) in the figure shows the basic form described above and the first form.
This is common to the fourth to fourth embodiments, and represents an actual transmission frame. In the column (1), the field indicated as “signal body” corresponds to the frame fr described so far.
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 number of bits shown. The “signal body” is arranged with 348 bits. As mentioned earlier,
Each frame is described as being unified to 169 bits. However, in practice, the 169 bits are transmitted with a bit string subjected to error correction coding. This is 34
It is an 8-bit signal body.

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

The background of the fifth embodiment to which the present invention is applied is as follows. In a GPS-AVM system or the like, there is a case where a call is made between mobile stations. For example,
This is a case where it is necessary to communicate with a nearby mobile station when the mobile station 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 constantly transmits,
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, in the mobile station, the frequency deviation is generally set gently from the viewpoint of cost and space.
Therefore, when a call is made between mobile stations as described above, the frequency deviation between the mobile stations becomes even larger,
Reception performance may drop or sometimes reception may not be possible. In addition, since the mobile station suddenly transmits a frame only when the mobile station is transmitting, the other mobile station performs automatic control at a high speed so as to match the transmission frequency at the start of a call, in a short time. There arises a problem that the reception frequency of the own station must be made to follow.

As a solution to this problem, in the fifth embodiment,
In the superframe configuration of the above-described embodiments, attention is paid to a frame fr3 in which a vacant voice transmission occurs, and a carrier to which no digital modulation is applied, that is, an unmodulated carrier is inserted into this frame and transmitted to the other mobile station. . The reason for using an unmodulated carrier is clear from FIG. FIG. 18 is a spectrum diagram for explaining the fifth embodiment.

FIG. 9 shows a non-modulated 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 broad. In contrast, the spectrum of an unmodulated carrier is very narrow. Therefore, the receiving-side mobile station can perform frequency pulling-in at a much higher speed by receiving an unmodulated carrier having a narrow spectrum than by a modulated carrier having a wide spectrum, which is difficult to track the frequency.

Thus, if the transmitting mobile station outputs the non-modulated carrier of FIG. 18 at the timing of frame fr3 in the superframe SF, the receiving mobile station can use the unmodulated carrier in the received frame fr3 at high speed. Frequency pull-in can be performed by the frequency control circuit.
More preferably, a non-voice transmission frame (frame fr3) that carries an unmodulated carrier is arranged at the head of the superframe SF. Thus, the start timing of the frequency control circuit can be further advanced.

FIG. 19 is a flowchart (part 1) showing an operation example of the mobile station side transmitting / receiving apparatus 4 based on the fifth embodiment, and FIG. 20 is a flowchart (part 2). Most of the flowcharts shown in FIGS. 19 and 20 are almost the same as the flowcharts described above. What differs is steps S41 and S42 unique to this embodiment.

In step S41, when it is determined in the preceding step that the frame is frame fr3, it is determined whether or not the communication between the mobile stations is to be started and the transmission switch (FIG. 24) is pressed. In the step S42, the judgment result is Y
In the case of ES, the above-mentioned unmodulated carrier is replaced with the frame fr3
And transmits one frame to the receiving mobile station. Hereinafter, when a frame is transmitted and a response signal is returned from the receiving mobile station, a frame fr3 carrying normal control data is transmitted instead of the unmodulated carrier.

With the above configuration, it is easy to cause the other station to follow the mobile station at high speed even during a call between mobile stations. [Sixth Embodiment] Finally, a sixth embodiment will be described. This sixth embodiment is an improvement over the fifth embodiment in terms of synchronization protection.

FIG. 21 is a configuration diagram of a transmission frame for explaining the sixth embodiment. In this figure, FIG.
The synchronization signal SYNC which is not seen in the embodiment) is adopted. That is, in the sixth embodiment, the synchronization signal SYNC (2
0 bit).

The background for the need for the sixth embodiment will be described below. Generally, when a signal having a continuous frame structure is received, 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. If the timing of the synchronization symbol cannot be confirmed due to fading or the like, synchronization protection is performed by estimating the synchronization symbol from the previous frame and demodulating the synchronization symbol (for example, Japanese Patent Laid-Open No. 7-16247).
No. 3: Synchronous protection method for digital communication).

However, in the method of the fifth embodiment described above, when a non-modulated carrier is received, there is no synchronization signal and synchronization protection cannot be applied. In other words, once every four frames, the synchronization protection is skipped at the frame fr3, so that the front protection is weakened. To solve this, an unmodulated carrier is transmitted after arranging synchronization symbols. FIG. 21 shows the configuration of this frame.

[0092] As a result, synchronization protection at the time of transmitting a non-modulated carrier can be ensured even in a communication between mobile stations.

[0093]

As described above, according to the present invention, a new transmission system not available in the conventional mobile communication system is realized, and the base station and each mobile station constituting the system are realized by this transmission system. Can greatly simplify the hardware configuration and software of the transmitting / receiving device. Thus, the economics of the system is greatly improved.
Further, the transmission efficiency of both the downlink frame and the uplink frame is increased, and the operation efficiency of the system is also improved as compared with the conventional case.

Further, this transmission system 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 the drawings]

FIG. 1 is a diagram showing a basic configuration example of a transmitting / receiving apparatus according to the present invention.

FIG. 2 is a diagram showing an example of a frame configuration output from a superframe transmitting means 30.

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

FIG. 4 is a flowchart illustrating an operation example of the base station side transmitting / receiving apparatus 12.

FIG. 5 is a flowchart illustrating an operation example of the mobile station-side transmitting / receiving device 4.

FIG. 6 is a diagram illustrating an example of a frame configuration based on the first embodiment.

FIG. 7 shows a base station side transmitting / receiving apparatus 12 under the first embodiment.
6 is a flowchart showing an operation example of the above.

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 illustrating a frame configuration example based on a second embodiment.

FIG. 10 shows a base station-side transmitting / receiving apparatus 1 under the second embodiment.
6 is a flowchart (No. 1) illustrating an operation example 2;

FIG. 11 shows a base station side transmitting / receiving apparatus 1 under the second embodiment.
10 is a flowchart (No. 2) illustrating an operation example 2;

FIG. 12 shows a mobile station side transmitting / receiving apparatus 4 under the second embodiment.
5 is a flowchart (No. 1) showing an operation example of the above.

FIG. 13 shows a mobile station-side transmitting / receiving apparatus 4 under the second embodiment.
10 is a flowchart (No. 2) showing an operation example of FIG.

FIG. 14 is a diagram illustrating a frame configuration example based on a third embodiment.

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

FIG. 16 is a diagram illustrating a frame configuration example based on a fourth embodiment.

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

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

FIG. 19 is a flowchart (part 1) illustrating an operation example of the mobile station-side transmitting / receiving device 4 based on the fifth embodiment.

FIG. 20 is a flowchart (part 2) illustrating an operation example of the mobile station-side transmitting / receiving device 4 based on the fifth embodiment.

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

FIG. 22 is a diagram illustrating an example of a general frame configuration in a mobile communication system using a digital modulation scheme.

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

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... GPS-AVM system 2 ... Base station 3 ... Mobile station 4 ... Transceiving apparatus 5 ... Speech encoder 6 ... Speech decoder 7 ... Control part 8 ... Digital modulator / demodulator 9 ... Sending and receiving part 12 ... Transceiving apparatus 13 ... Speech encoder DESCRIPTION OF SYMBOLS 14 ... Transmission control part 15 ... Digital modulator 16 ... Transmission part 17 ... Host computer 19 ... Speech decoder 20 ... Reception control part 21 ... Digital demodulator 22 ... Reception part 23 ... Reservation impossible table 30 ... Super frame transmission means 31 ... Voice data generator 32 ... Transmission frame generator 33 ... Super frame generator

Claims (18)

[Claims] 1. A super frame transmitting means for storing data to be transmitted to a receiving side in a plurality of frames each having the same time length, and for assembling a series of the plurality of frames into a super frame and transmitting the super frame. Characteristic transmission / reception device for mobile communication. 2. A mobile communication transmitting / receiving apparatus provided in a base station, and the other is a mobile communication transmitting / receiving apparatus provided in each of a plurality of mobile stations. 2. The transmitting / receiving apparatus for mobile communication according to claim 1, wherein both the downstream superframe and the upstream superframe from the mobile station to the base station have the same frame configuration. 3. The super-frame transmitting means includes: an audio data generation unit configured to generate audio to be transmitted to the receiving side as an audio frame containing audio data encoded at every first predetermined period; A plurality of transmission frames having a second predetermined period, wherein the voice corresponding to the time length of the superframe is allocated as shorter-time voice data obtained from the voice data generator. A transmission frame generation unit for generating a frame, a superframe having a third predetermined period which is n times as long as the second predetermined period, wherein the audio data is 2 or more and (n-1) or less The transmission / reception device for mobile communication according to claim 1, further comprising: a superframe generation unit that arranges the transmission frame therein and transmits the transmission frame. 4. The mobile unit according to claim 3, wherein said super frame transmitting means transmits non-voice data instead of said voice data when there is no voice to be transmitted to said receiving side. Communication transceiver. 5. The transmission frame generating unit 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. The transmission / reception device for mobile communication according to claim 3, wherein the generation unit inserts at least one transmission frame for non-voice into the superframe. 6. The transmission frame generation unit assigns a unique frame number to each of a plurality of transmission frames including the transmission frame for voice and the transmission frame for non-voice, and transmits the transmission frame to the receiving side. The transmission / reception device for mobile communication according to claim 5, wherein: 7. When a super frame in which a unique frame number is assigned to each of a plurality of transmission frames including the voice transmission frame and the non-voice transmission frame is received from a transmitting side, the received super frame is transmitted. The transmission / reception device for mobile communication according to claim 6, wherein a transmission transmission frame is sequentially generated in synchronization with the frame number in a frame, and is transmitted from the superframe generation unit. 8. The mobile communication according to claim 6, wherein the transmission frame further includes a frame attribute bit indicating what type of data is accommodated in a non-voice transmission frame. Transceiver. 9. The transmission / reception apparatus for mobile communication according to claim 6, wherein the transmission frame for voice includes additional data distinguishable from the voice and non-voice information. . 10. The mobile communication transmitting / receiving apparatus according to claim 9, wherein the additional data is individually included in each of the voice transmission frames. 11. The transmission frame for audio which is to be individually included in each of the transmission frames for audio is collectively included in any one of the transmission frames for audio in the superframe. A transmitting / receiving device for mobile communication according to claim 9. 12. The method according to claim 1, wherein an error detection code is added to the non-voice transmission frame, and an error detection code is added to a portion other than the voice data in the voice transmission frame. 6. The transmitting / receiving device for mobile communication according to 5. 13. An error detection code is added in the transmission frame for voice, an error detection code is added in the transmission frame for non-voice, and the corresponding error code is included in each transmission frame. The transmission / reception device for mobile communication according to claim 5, wherein a data format of data to which the detection code is applied is unified for all the transmission frames. 14. The data format of the transmission frame for audio is added by further adding a part of the audio data to the data to which the error detection code is applied in the transmission frame for audio. 14. The transmission / reception device for mobile communication according to claim 13, wherein the data format of the transmission frame for non-voice is unified. 15. The transmission / reception apparatus for mobile communication according to claim 5, wherein in the superframe generated by modulating a carrier, one transmission frame in the superframe is an unmodulated carrier. . 16. The transmission / reception device for mobile communication according to claim 15, wherein the transmission frame carrying the unmodulated carrier is the non-voice transmission frame. 17. The transmitting / receiving apparatus for mobile communication according to claim 16, wherein the non-voice transmission frame carrying the unmodulated carrier is arranged at the head of the superframe. 18. The mobile communication transmitting / receiving apparatus according to claim 15, wherein a synchronization signal is included at the head of the unmodulated carrier.