JPH09307519A - Information transmission controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To send control information faster than the case with transmission through a slow associated control channel(SACCH) by reducing deterioration in quality when bad frame processing is conducted at a receiver side. SOLUTION: This controller is provided with a sound detection section 110, a voice coding section 120, a changeover section 130 selecting a compression coded voice or fast associated control channel(FACCH) information, a queue FACCH memory 140, an FACCH error correction coding section 150, a voice error correction coding section 160, a slot processing section 170 for a signal subject to error correction coding by the voice error correction coding section 160 and a call control processing 40 instructing control information and permissible wait time to the changeover section 130. Then the changeover section 130 selects the FACCH error correction coding section 150 or the voice error correction coding section 160 so that control information is transmitted while avoiding sound data of the voice signal when the time is within a permissible wait time of the FACCH information to be sent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information transmission control device used in a cellular mobile phone device, etc.
The present invention relates to an information transmission control device that can be used in a communication system that transmits (receives) control information by using (stealing) an information area for a voice slot.

[0002]

2. Description of the Related Art A current digital wireless mobile terminal device, such as a PHS, uses a 1.9 GHz band as a frequency band to be used, a carrier interval is 300 kHz, and an access method is 4-channel multiplex multi-carrier TDMA (Time Divisio).
n Multiple Access: time division multiple access), and the transmission method is TDD (Time Division Duplex). In this access method and transmission method, a signal on one frequency is divided into, for example, 8 slots per 5 milliseconds, and 4 slots are provided for downlink (base station → terminal) and 4 slots for uplink (terminal → base station). Assign That is, four bidirectional communication channels can be simultaneously set on one carrier.

Data between the terminal and the base station is π / 4.
Shift QPSK (Quadrature Phase Shift Keying) is used, and the voice coding method is ADPC.
32 PCM audio signals of 64 kbit / sec by M (Adaptive Differential PCM)
It is compressed and encoded to k bits / second and transmitted.

The carrier frequency is divided into one for control and one for communication, and the control carrier is always shared by each terminal. The communication carrier confirms and uses a vacant carrier and slot at each communication at each terminal, and when receiving a radio wave interference, moves to another carrier or slot to avoid the interference.

By the way, in the TDM alpha cellular system in Japan or North America, SACCH (Slow Associated Control CHannel) is used to exchange control information with the base station.
And FACCH (Fast Associated Control CHannel) are stipulated in the recommendation. The SACCH divides the control information into a plurality of slots and sends the information in detail (it takes time to send all the information (40 ms or more), that is, Slo.
w) It is a channel and does not affect the voice quality.

On the other hand, the FACCH uses the information area for the voice slot that should be originally transmitted (steal) to send information, so that voice quality is deteriorated, but the transmission of information is S.
It has a feature of being faster (40 ms) than ACCH. When exchanging control information, two types of control information are used depending on whether the information is urgent.

As described above, in the North American TDM (A) cellular system (IS54B), voice or control information FACCH (Fast Associate) is stored in the same 260-bits data area.
d Control CHannel) is assigned and transmitted (received).

From the viewpoint of the MS, the voice information is normally transmitted at the time of transmission, and the FACCH is transmitted instead of the voice information only when the FACCH needs to be transmitted. On the contrary, on the receiving side, the stolen audio information is interpolated by the bad frame processing.

As a bad frame processing method, a method based on pre-interpolation and level reduction is generally used.
No matter what method is adopted, the lost information cannot be completely reproduced, so that the sound quality is deteriorated when the number of times the FACCH is transmitted increases.

[0010]

As described above, the FA
Since the CCH is control information, it has to be transmitted within a specified time, and when it is necessary to transmit it, it is general to transmit it immediately. Therefore, in the conventional information transmission control device, when the number of FACCH transmissions increases, there is a problem in that the quality of a reproduced voice is deteriorated due to bad frame processing on the receiving side. Also, F
When SACCH is used instead of ACCH, there is a problem that the time required for transmission becomes long.

According to the present invention, it is possible to reduce quality deterioration when bad frame processing is performed on the receiving side.
It is an object of the present invention to provide an information transmission control device capable of transmitting control information faster than when transmitting by H.

[0012]

An information transmission control apparatus according to the present invention uses a FACCH (Fast Associated Control CH) for transmitting control information using an information area for a voice slot.
in a TDMA system-based information transmission control device, a voiced sound detecting means for detecting a voiced part of voice, a voice encoding means for compression encoding a voice signal, a compression encoded voice and a FACCH. Switching means for switching transmission with information, and a standby F for storing FACCH information
ACCH memory, FACCH error correction coding means for performing error correction coding for FACCH, voice error correction coding means for performing error correction coding for voice, FACCH error correction coding means, and voice error correction code Slotting means for performing slot interleave conversion and TDM [alpha] slotting on the signal error-correction coded by the coding means,
And a call control means for instructing the switching means of the control information and the allowable waiting time, and the switching means transmits the control information while avoiding the voiced part of the voice within the allowable waiting time of the FACCH information to be transmitted. Thus, the FACCH error correction coding means and the voice error correction coding means are switched.

Further, the information transmission control device according to the present invention is
In an information transmission control device conforming to a TDMA system having a FACCH for transmitting control information using an information area for a voice slot, a level variation detecting means for detecting a variation in power level of voice from a voice signal and a voice signal are provided. Audio encoding means for compression encoding, switching means for switching transmission of compression encoded audio and FACCH information,
Standby FACCH memory for storing FACCH information, FACCH error correction coding means for performing error correction coding for FACCH, voice error correction coding means for performing error correction coding for voice, and FACCH error correction code Conversion means and slot-interleave conversion and TDM for the signal error-correction coded by the speech error correction coding means.
A slotting means for slotting, and a call control means for instructing the switching means control information and allowable waiting time,
If the switching means is within the allowable waiting time of the FACCH information to be transmitted, the FACC is configured to transmit the control information while avoiding the slot in which the change in the power level of the voice exceeds a predetermined value.
The H error correction coding means and the voice error correction coding means are switched.

Further, the voiced sound detecting means may detect the voiced sound detection cycle periodically at the same cycle as the block encoding cycle of the voice or at an integer multiple of the cycle, and the level fluctuation detecting means. Measures the power level of the voice periodically, and detects the level fluctuation depending on whether the value obtained by dividing the level change of the measurement cycle and the subsequent measurement cycle by the average power level exceeds a predetermined value. Good.

Further, the information transmission control device may be provided with an A / D conversion means for sampling a voice signal and converting it into a digital voice signal, and the digital bit string output from the slotting means is π / It may be provided with a D / A conversion means for converting into a 4QPSK baseband signal and a radio section for modulating the baseband signal into a transmission / reception radio frequency and transmitting it.

In addition, the information transmission control device may use voice or F
It may include a receiving unit that receives a radio signal to which any of the ACCHs is assigned.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The information transmission control device according to the present invention can be applied to an information transmission control device used in a cellular mobile phone device or the like.

FIG. 1 is a diagram showing a configuration of an information transmission control device according to a first embodiment of the present invention, which is an example applied to a mobile device such as a cellular mobile phone device.

In FIG. 1, a portable device 10 (information transmission control device) modulates a voice signal input from a microphone into a transmission / reception radio frequency (RF) and radiates from an antenna 50, and transmission / reception from the antenna 50. Radio frequency (R
F) a receiving unit 30 for receiving signals in the frequency band, call setting,
Controls opening, handoff, etc., and if necessary, the transmitter 20
A call control processor 40 that instructs the FACCH to be transmitted to
And a transmitting / receiving antenna 50.

The transmitting section 20 includes an A / D converting section 100,
Voice detection unit 110 (voice detection unit), voice encoding unit 12
0, switching unit 130, waiting FACC memory 140, FAC
The CH error correction coding unit 150, the voice error correction coding unit 160, the slotization unit 170, the D / A conversion unit 180, and the RF unit (radio unit) 190 are included.

The A / D conversion section 100 samples the voice signal input from the microphone and detects the sound detection section 110.
And output to the speech encoding unit 120.

The voice detecting section 110 determines whether the voice signal is a voice portion or a voiceless portion, and detects the voice portion of the voice.

The voice encoding unit 120 performs a compression encoding process of voice, and compresses and switches the PCM voice signal sent from the A / D conversion unit 100 by encoding it into a VSELP voice signal. It is output to the unit 130.

The switching unit 130 switches between transmission of coded voice and FACCH, and the FA to be transmitted.
If it is within the allowable waiting time of the CCH information, the FACCH error correction coding unit 150 and the voice error correction coding 160 are switched so that the control information is transmitted while avoiding the voiced part of the voice.

The waiting FACC memory 140 is an FAC.
Store CH information.

Error correction coding unit 150 for FACCH
Performs error correction coding for FACCH, and performs CRC (cyclic redundancy check code) coefficient calculation for error detection, convolutional coding, and interleave conversion.

The voice error correction coding unit 160 performs voice error correction coding, and is, for example, the switching unit 13.
The output from 0 is encoded by the CRC for error detection. The receiving unit 30 detects an error in the transmitted data by analyzing the CRC. This code is not only a random code but also has a burst error detection capability and is capable of error correction.

The slotting section 170 performs slot interleaving and slotting processing according to the TDM (A) cellular system. The slotting section 170 includes an FACCH error correction coding section 150 and a voice error correction coding section 160.
The control data is added to the voice data transferred from to generate transmission data, which is scrambled and the like, and is transmitted at a predetermined timing, that is, inserted into the self-assigned slot of the frame and transmitted. For example, a fixed length T that is the basic cycle
This is done using a pair of time positions (time slots) assigned in the DMA frame, and each station sends a signal in the assigned time slot in the frame, so that this signal does not collide with other signals. Performs control (burst synchronization control). TDM Α 1 frame period is 40
ms = 1944 bits (6 slots configuration), and the sub-frame period in the frame is 20 ms (3 slots configuration).

The D / A converter 180 converts a digital bit string into a π / 4QPSK baseband signal and constitutes a part of the baseband interface.

The RF unit 190 modulates a baseband signal, and is composed of, for example, a PLL synthesizer, a bandpass filter, a linear power amplifier, a transmission / reception duplexer for distributing transmission / reception, and the like.

As described above, in the portable device 10 according to the first embodiment, the transmitter 20 samples the audio signal and converts it into a digital audio signal, and the A / D converter 100.
A sound detecting unit 110 that detects a sound part of voice, a voice encoding unit 120 that compression-encodes a voice signal, a switching unit 130 that performs transmission switching between compression-encoded voice and FACCH information, and a FACCH. Waiting FACC to store information
H memory 140, FACCH error correction coding unit 150 that performs error correction coding for FACCH, voice error correction coding unit 160 that performs error correction coding for voice, and FA
The CCH error correction coding unit 150 and the slotization unit 170 that performs slot interleave conversion and TDM [alpha] slot conversion on the signal that has been error correction coded by the voice error correction coding unit 160, and the slotting unit 170 output the signals. It is composed of a D / A converter 180 for converting a digital bit string into a π / 4QPSK baseband signal, and an RF unit 190 for modulating the baseband signal into a transmission / reception radio frequency and transmitting the modulated baseband signal. Furthermore, either voice or FACCH is used. It is configured to include a receiving unit 30 that receives the assigned wireless signal, and a call control processor 40 that instructs the switching unit 130 of control information and an allowable waiting time.

Although the voice detecting unit 110 and the voice encoding unit 120 are arranged in parallel in FIG. 1, the A / D conversion unit 100 → the voice detecting unit 110 → the voice encoding unit 120 are arranged in serial. Alternatively, the A / D conversion unit 100, the voice coding unit 120, and the sound detecting unit 110 may be serially arranged.

Hereinafter, the portable device 1 configured as described above
The operation of the transmission unit 20 of 0 will be described.

The A / D conversion unit 100 samples the voice input signal from the microphone and outputs a digital signal to the sound detecting unit 110 and the voice encoding unit 120. The audio encoding unit 120 compression-encodes the audio signal, for example, 20 m
A block-encoded voice compression signal is output in s cycles.
Further, the sound detecting section 110 determines whether the audio signal is a sound section or a silent section, and reports the determination result to the switching section 130.

Here, the period of voiced detection is the same as the block coding period of voice or is an integral multiple. The method of detecting the voice is basically based on the power level calculation, but any method may be used for the processing of the head of speech or the ending of speech.

The call control processor 40 determines the FA to be transmitted.
The switching unit 130 is notified of the CCH information and the allowable waiting time (the number of allowable waiting slots).

FIG. 2 is a flow chart for explaining the operation of the switching unit 130 of the transmission unit 20, and this flow is 20
The process is started once per ms and the program is executed. Note that ST in the drawing indicates each step of the flow.

First, in step ST10, it is determined whether or not there is a FACCH transmission instruction from the call control processor 40, and if there is a transmission instruction, it is saved in the waiting FACCH memory 140 in step ST11. This waiting FAC
In the C memory 140, the allowable waiting time is recorded together with the FACCH information.

If there is no FACCH transmission instruction in step ST10, it is determined in step ST12 whether or not the allowable waiting time of the waiting FACCH memory 140 is 0 or less.

Waiting FACCH The FACCH to be transmitted when there is no allowable waiting time of the memory 140 of 0 or less.
It is judged that it is within the permissible waiting time for information, and step ST
The flag that determines whether or not there is sound in 13 is checked. When the flag indicates that the voice is present, the process is switched to the voice error correction coding unit 160 in step ST14, and in step ST15, the permissible waiting time of the waiting FACCK is decremented by 1 and the present flow ends.

In addition, if the flag which has been judged whether there is sound in step ST13 is checked and if there is no sound without sound, it is judged in step ST16 whether there is a waiting FACCH.

When there is no waiting FACCH, step ST
In step ST14, the process is switched to the voice error correction coding unit 160.

That is, if there is a voiced part of the voice within the allowable waiting time of the FACCH information to be transmitted, or if there is no waiting FACCH even if there is no sound, step ST
At 14, the processing is switched to the error correction coding unit 160 for speech,
The voice signal is encoded by the voice error correction encoding unit 160.

In step ST16, the waiting FACCH
If there is, the process is switched to the FACCH error correction coding unit 150 in step ST17, and the FACCH information is set to F.
The data is output to the ACCH error correction coding section 150 and the process proceeds to step ST15.

On the other hand, in the step ST12, the waiting FAC
When the allowable waiting time of the C memory 140 is less than or equal to 0, it is determined that it is outside the allowable waiting time of the FACCH information to be transmitted, and the process proceeds to step ST17 as it is. This is output to the encoding unit 150, and in step ST15, the allowable waiting time of the waiting FACCH is all decremented by one.

That is, it is outside the allowable waiting time of the FACCH information to be transmitted, or the FACCH to be transmitted.
Wait within the permissible waiting time for information, and even if there is no sound F
If there is an ACCH, FACCH in step ST17
Processing is switched to the error correction coding unit 150 for FACCH
The error correction coding unit 150 codes the FACCH information.

As described above, the switching unit 130 executes the process of transmitting the control information (FACCH information) while avoiding the voiced portion of the voice if it is within the allowable waiting time of the FACCH information to be transmitted.

Returning to FIG. 1, FACCH error correction coding section 150 performs CRC coefficient calculation for error detection, convolutional coding, and interleave conversion. Further, the error correction coding unit for speech 160 performs CRC coefficient calculation for error detection, convolutional coding, and interleave conversion. However, any method may be used for the error detection, error correction, and interleave conversion cycles used in the FACCH error correction coding unit 150 and the voice error correction coding unit 160.

The slotting section 170 performs slot interleave conversion and TDMα slotting. In slotting, error-corrected information is added to the sync pattern, SACC
H, CDVCC (Coded Digital Verification Color C
ode: an identifier given by the base station at call setup) is added.

In the D / A converter 180, the slotting unit 17
The bit string created by 0 is used as a π / 4QPSK baseband signal, and the RF unit 190 modulates the baseband signal and sends it from the antenna 50 to the air.

As described above, in the portable device 10 according to the first embodiment, the transmitting unit 20 has the voice detecting unit 110 for detecting the voice portion of the voice and the voice code for compressing and encoding the voice signal. Conversion unit 120, compression-coded speech and FACC
A switching unit 130 for switching transmission with H information, and FACC
A standby FACCH memory 140 for storing H information,
FACCH error correction coding unit 150 that performs error correction coding for FACCH, voice error correction coding unit 160 that performs error correction coding for voice, FACCH error correction coding unit 150, and voice error correction coding A receiving unit 30 configured to include a slotting unit 170 that performs slotting on the signal error-correction-coded by the unit 160, and further receives a radio signal to which either voice or FACCH is assigned; Control information and allowable waiting time switching unit 1
And a call control processor 40 for instructing the FACCH error correction code so that the control unit transmits the control information while avoiding the voiced part of the voice within the allowable waiting time of the FACCH information to be transmitted. Since the conversion unit 150 and the voice error correction coding 160 are switched, the FACCH insertion position is controlled on the transmission side so as to reduce the deterioration of the reproduced voice even if the bad frame processing is performed on the reception side. Therefore, it is possible to reduce the quality deterioration when the bad frame processing is performed on the receiving side when the FACCH is periodically transmitted, and the transmission is performed only on the FACCH.
The control information can be transmitted earlier than the transmission by SACC.

Therefore, if the information transmission control device having such excellent features is applied to a wireless portable terminal device such as a communication system for transmitting / receiving control information by using (stealing) an information area for a voice slot, In this wireless mobile terminal device, there is no quality deterioration and faster information transmission can be performed.

FIG. 3 is a block diagram showing the configuration of an information transmission control device according to the second embodiment of the present invention. The information transmission control device shown in FIG. 3 can also be applied to a mobile device such as a cellular mobile phone device. In the description of the information transmission control device according to the present embodiment, the same components as those of the information transmission control device shown in FIG. 1 will be assigned the same reference numerals and overlapping description will be omitted.

In FIG. 3, a portable device 60 (information transmission control device) modulates a voice signal input from a microphone into a transmission / reception radio frequency (RF) and radiates from the antenna 50, and transmission / reception from the antenna 50. Radio frequency (R
F) a receiving unit 30 for receiving signals in the frequency band, call setting,
Controls opening, handoff, etc., and if necessary, the transmitter 20
A call control processor 40 that instructs the FACCH to be transmitted to
And a transmitting / receiving antenna 50.

The transmitting section 70 includes an A / D converting section 100,
Level fluctuation detection section 200 (level fluctuation detection means), speech coding section 120, switching section 130, standby FACC memory 1
40, FACCH error correction coding section 150, speech error correction coding section 160, slotting section 170, D / A conversion section 180 and RF section 190.

The A / D conversion unit 100 samples the voice signal input from the microphone and samples the voice detection unit 110.
And output to the speech encoding unit 120.

The level fluctuation detecting section 200 detects fluctuations in the power level of voice.

The voice encoding unit 120 performs compression encoding processing of voice, and compresses and switches the PCM voice signal sent from the A / D conversion unit 100 by encoding it into a VSELP voice signal. It is output to the unit 130.

The switching unit 130 switches the transmission of encoded voice and FACC transmission, and particularly in the second embodiment, the power level of voice is within the allowable waiting time of FACCH information to be transmitted. FACCH so that control information is transmitted while avoiding slots in which the change of
Error correction coding unit 150 and speech error correction coding unit 120
Switch between and.

The waiting FACC memory 140 is the FAC.
Store CH information.

Error correction coding section 150 for FACCH
Performs error correction coding for FACCH, and performs CRC coefficient calculation for error detection, convolutional coding, and interleave conversion.

The voice error correction coding unit 160 performs voice error correction coding, and is, for example, the switching unit 13.
The output from 0 is encoded by the CRC for error detection.

The slotting section 170 performs slot interleaving and slotting processing according to the TDM (A) cellular system.

The D / A converter 180 converts the digital bit string into a π / 4QPSK baseband signal.

The RF section 190 modulates a baseband signal, and is composed of, for example, a PLL synthesizer, a bandpass filter, a linear power amplifier, and a transmission / reception duplexer for dividing transmission / reception.

As described above, in the portable device 60 according to the second embodiment, the transmitting section 70 samples the audio signal and converts it into the digital audio signal, and the A / D converting section 100.
A level variation detection unit 200 that detects a variation in the power level of a voice from a voice signal, a voice encoding unit 120 that compression-encodes the voice signal, a compression-encoded voice, and a FACCH.
A switching unit 130 for switching transmission with information, and a FACCH
A standby FACCH memory 140 for storing information;
FACCH error correction coding unit 150 that performs error correction coding for ACCH, voice error correction coding unit 160 that performs error correction coding for voice, FACCH error correction coding unit 150, and voice error correction coding A slotting unit 170 that performs slot interleave conversion and TDM [alpha] slotting on the signal error-correction-coded by the unit 160;
The D / A converter 180 converts the digital bit string output from the slotter 170 into a π / 4QPSK baseband signal, and the RF unit 190 modulates the baseband signal into a transmission / reception radio frequency and sends the modulated baseband signal. , And a call control processor 40 for instructing the switching unit 130 of control information and allowable waiting time.

In FIG. 3, the level fluctuation detecting section 200 and the speech coding section 120 are arranged in parallel.
It may be arranged serially with the D conversion unit 100 → the level fluctuation detection unit 200 → the speech coding unit 120, or the A / D conversion unit 100 → the speech coding unit 120 → the level fluctuation detection unit 200.
It may be arranged serially.

Hereinafter, the portable device 6 configured as described above
The operation of the transmission unit 70 of 0 will be described.

The A / D converter 100 samples the voice input signal from the microphone and outputs a digital signal to the sound detecting unit 110 and the voice encoder 120. The audio encoding unit 120 compression-encodes the audio signal, for example, 20 m
A block-encoded voice compression signal is output in s cycles.
Further, the level fluctuation detection unit 200 periodically measures the power level of the audio signal, and determines whether or not (level change of a certain measurement cycle and the subsequent measurement cycle) / (average power level) exceeds a set value. Then, the determination result is reported to the switching unit 130.

Here, the level fluctuation detection cycle is the same as or integral multiple of the voice block coding cycle. The level fluctuation detection method is based on power level calculation, but any method may be used.

The call control processor 40 determines the FA to be transmitted.
The switching unit 130 is notified of the CCH information and the allowable waiting time (the number of allowable waiting slots).

FIG. 4 is a flow chart for explaining the operation of the switching unit 130 of the transmitting unit 70, and this flow is 20
The process is started once per ms and the program is executed. The same steps as those in FIG. 2 are designated by the same reference numerals.

First, in step ST10, it is determined whether or not there is a FACCH transmission instruction from the call control processor 40, and if there is a transmission instruction, it is saved in the waiting FACCH memory 140 in step ST11. This waiting FAC
In the C memory 140, the allowable waiting time is recorded together with the FACCH information.

If there is no FACCH transmission instruction in step ST10, it is determined in step ST12 whether or not the allowable waiting time of the waiting FACC memory 140 is 0 or less.

Waiting FACCH The FACCH to be transmitted when there is no allowable waiting time of the memory 140 of 0 or less.
It is judged that it is within the permissible waiting time for information, and step ST
At 20, the flag that determines whether or not the level fluctuation of the voice is smaller than the set value is checked. If the level fluctuation is equal to or larger than the set value (level fluctuation ≧ set value) as seen from the flag, the process is switched to the error correction coding unit for voice 160 in step ST14, and in step ST15, all the allowable waiting times of the waiting FACCK are set to 1 Decrement and end this flow.

If the level variation of the voice is smaller than the set value in the step ST20 and the flag for judging whether or not the level variation of the voice is smaller than the set value is checked (level variation <set value), the process proceeds to step ST16. Waiting FACC
It is determined whether or not H is present.

When there is no waiting FACCH, step ST
In step ST14, the process is switched to the voice error correction coding unit 160.

That is, when the level fluctuation of the voice is equal to or larger than the set value within the allowable waiting time of the FACCH information to be transmitted, or even when the level fluctuation is smaller than the set value, the waiting FAC is waited for.
When there is no CH, the process is switched to the error correction coding unit for speech 160 in step ST14, and the speech signal is coded by the error correction coding unit for speech 160.

In step ST16, the waiting FACCH
If there is, the process is switched to the FACCH error correction coding unit 150 in step ST17, and the FACCH information is set to F.
The data is output to the ACCH error correction coding section 150 and the process proceeds to step ST15.

On the other hand, in step ST12, the waiting FAC
When the allowable waiting time of the C memory 140 is less than or equal to 0, it is determined that it is outside the allowable waiting time of the FACCH information to be transmitted, and the process proceeds to step ST17 as it is. This is output to the encoding unit 150, and in step ST15, the allowable waiting time of the waiting FACCH is all decremented by one.

That is, it is outside the allowable waiting time of the FACCH information to be transmitted, or the FACCH to be transmitted.
If there is a waiting FACCH even within the permissible waiting time of information and the level fluctuation of the voice is smaller than the set value, the process is switched to the FACCH error correction coding unit 150 in step ST17, and the FACCH error correction coding unit is processed. The FACCH information is encoded by 150.

As described above, the switching section 130 transmits the control information (FACCH information) while avoiding the slot in which the change in the power level of the voice exceeds the set value, within the allowable waiting time of the FACCH information to be transmitted. The process is executed.

Returning to FIG. 3, FACCH error correction coding section 150 performs CRC coefficient calculation for error detection, convolutional coding, and interleave conversion. Further, the error correction coding unit for speech 160 performs CRC coefficient calculation for error detection, convolutional coding, and interleave conversion. However, any method may be used for the error detection, error correction, interleave conversion cycles, etc. used in the two types of error correction coding units.

The slotting section 170 performs slot interleave conversion and TDMα slotting. In slotting, error-corrected information is added to the sync pattern, SACC
H, add CDVCC.

In the D / A converter 180, the slotting unit 17
The RF section 190 modulates the baseband signal by using the bit string created by 0 as the π / 4QPSK baseband signal.

As described above, in the portable device 60 according to the second embodiment, the transmitting unit 70 detects the fluctuation of the power level of the sound from the sound signal, and the level fluctuation detecting unit 200.
If the switching unit 130 is within the allowable waiting time of the FACCH information to be transmitted, the FACCH error correction coding unit is configured to transmit the control information while avoiding the slot in which the change in the power level of the voice exceeds a predetermined value. Since it is configured to switch between 150 and the voice error correction coding unit 120,
Even if the receiving side performs bad frame processing, the FACCH insertion position can be controlled by the transmitting side so as to reduce the deterioration of the reproduced voice, and when the FACCH is periodically transmitted, the receiving side performs bad frame processing. It is possible to reduce the quality deterioration of the
Since it is performed in H, the control information can be transmitted earlier than in SACC.

The information transmission control device according to each of the above-mentioned embodiments can be applied to the cellular mobile phone device as described above, but of course the invention is not limited to this, and the information area for the voice slot is provided. If it is a communication system that uses (steals) and sends and receives control information, all devices (for example,
Needless to say, it can be applied to mobile communication terminals).

A constituting the above information transmission control device
It goes without saying that the types of the / D conversion unit, the voice encoding unit, the slotting unit, the D / A conversion unit, etc., the sampling and encoding methods, etc. are not limited to the above-described embodiment.

[0089]

In the information transmission control device according to the present invention, the voice detecting means for detecting the voice portion of the voice, the voice encoding means for compression encoding the voice signal, the compression encoded voice and the FACCH. Switching means for switching transmission with information and FA
A standby FACCH memory for storing CCH information;
An error is caused by the FACCH error correction coding means for performing error correction coding for ACCH, the voice error correction coding means for performing error correction coding for voice, the FACCH error correction coding means, and the voice error correction coding means. The FCCCH to be transmitted is provided with a slotting means for performing slot-interleave conversion and TDM [alpha] -slot conversion for the correction-encoded signal, and a call control means for instructing the switching means of control information and allowable waiting time. Within the permissible waiting time of information, the FACCH error correction coding means and the voice error correction coding means are switched so that the control information is transmitted while avoiding the voiced part of the voice.
The quality degradation when the bad frame processing is performed on the receiving side in the case of periodically transmitting the SAC is performed, and the transmission is performed by the FACCH.
Control information can be transmitted faster than sending by.

Further, in the information transmission control device according to the present invention, the level fluctuation detecting means for detecting the fluctuation of the power level of the sound from the sound signal, the sound coding means for compressing and coding the sound signal, and the compression coding. Switching means for switching transmission between the voice and the FACCH information, a standby FACCH memory for storing the FACCH information, a FACCH error correction coding means for performing error correction coding for the FACCH,
A voice error correction coding means for performing error correction coding for voice, a FACCH error correction coding means, and a slot interleave conversion and TDM [alpha] slot conversion for a signal error-correction coded by the voice error correction coding means. It comprises slotting means for performing and call control means for instructing the switching means of control information and allowable waiting time, and the switching means changes the power level of voice within the allowable waiting time of the FACCH information to be transmitted. Since the FACCH error correction coding means and the voice error correction coding means are switched so as to transmit the control information while avoiding the slots exceeding the predetermined value, the receiving side is required when the FACCH is periodically transmitted. It is possible to reduce the quality deterioration in the case of bad frame processing in S. It can be transmitted faster control information than sending by Eta.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an information transmission control device according to a first embodiment to which the present invention is applied.

FIG. 2 is a flowchart for explaining the operation of the information transmission control device.

FIG. 3 is a block diagram showing a configuration of an information transmission control device according to a second embodiment to which the present invention is applied.

FIG. 4 is a flowchart for explaining the operation of the information transmission control device.

[Explanation of symbols]

10,60 Portable device (information transmission control device), 20,7
0 transmitter, 30 receiver, 40 call control processor,
100 A / D conversion unit, 110 voice detection unit (voice detection unit), 120 voice coding unit, 130 switching unit (switching unit), 140 waiting FACC memory, 150 FACC
H error correction coding unit, 160 speech error correction coding unit, 170 slot conversion unit, 180 D / A conversion unit, 1
90 RF unit (wireless unit), 200 level fluctuation detecting unit (level fluctuation detecting means)

Claims (7)

[Claims] 1. A FACCH (Fast Associated Control) for transmitting control information using an information area for a voice slot.
In an information transmission control device conforming to a TDMA system having an L CHannel), a voice detecting unit that detects a voice portion of voice, a voice encoding unit that compression-encodes a voice signal, and a compression-encoded voice. Switching means for switching transmission to and from FACCH information, standby FACCH memory for storing FACCH information, FACCH error correction coding means for performing error correction coding for FACCH, and error correction coding for voice Speech error correction coding means, the FACCH error correction coding means, and slotting means for performing slot interleave conversion and TDM [alpha] slotting on the signal error-correction coded by the speech error correction coding means, Call control means for instructing the switching means of the control information and the allowable waiting time, and the switching means is the FA to be transmitted. Within the allowable waiting time of the CH information, the FACCH error correction coding means and the speech error correction coding means are switched so that the control information is transmitted while avoiding the voiced part of the voice. An information transmission control device characterized by: 2. An information transmission control device conforming to a TDMA system having a FACCH for transmitting control information using an information area for a voice slot, a level fluctuation detecting means for detecting a fluctuation of a power level of a voice from a voice signal. A voice coding means for compressing and coding a voice signal, a switching means for switching transmission between compressed and coded sound and FACCH information, a standby FACCH memory for storing FACCH information, and an error for FACCH FACCH error correction coding means for performing correction coding, voice error correction coding means for performing error correction coding for voice, the FACCH error correction coding means, and error correction code by the voice error correction coding means Slot-interleaving means for performing slot-interleave conversion and TDM-A slot conversion for the converted signal; And a call control unit for instructing the switching unit of information and an allowable waiting time, the switching unit changing the power level of the voice exceeds a predetermined value within the allowable waiting time of the FACCH information to be transmitted. An information transmission control device, characterized in that the FACCH error correction coding means and the voice error correction coding means are switched so as to transmit the control information while avoiding slots. 3. The sound detecting means is adapted to detect the sound detecting period periodically at a period equal to or a multiple of a block coding period of speech. Information transmission control device described. 4. The level fluctuation detecting means periodically measures the power level of the voice, and determines whether a value obtained by dividing the level change of the measurement cycle and the subsequent measurement cycle by the average power level exceeds a predetermined value. 3. The information transmission control device according to claim 2, wherein the level fluctuation is detected by the above. 5. The information transmission control device according to claim 1 or 2, further comprising an A / D conversion means for sampling a voice signal and converting it into a digital voice signal. Information transmission control device. 6. The information transmission control device according to claim 1 or 2, wherein the digital bit string output from the slotting means is converted into a π / 4QPSK baseband signal. An information transmission control device comprising: a radio unit that modulates the baseband signal to a transmission / reception radio frequency and sends the modulated radio frequency. 7. The information transmission control device according to any one of claims 1, 2, 3, 4, 5 or 6, further comprising: a receiving unit for receiving a radio signal to which either voice or FACCH is assigned. An information transmission control device characterized by the above.