JP5083383B2 - Communication apparatus and communication method - Google Patents

Description

  The present invention relates to a communication apparatus and a communication method, and in particular, includes a communication apparatus and a communication method having a function of detecting abnormal noise due to a secret parameter shift during voice communication and automatically disconnecting and retransmitting.

  In Patent Document 1, among the secret parameters that cause the generation of voice noise due to the secret parameter deviation during voice communication, at the timing when the deviation of the counter value (CFN) exchanged between the mobile station and the base station occurs, It is described that by correcting the counter value on the base station side, the secret parameters are matched on the base station side and the mobile device side, and the generation of voice noise is avoided while continuing the call connection.

JP 2005-176335 A

  However, in the configuration of the above-described prior art, when the message exchanged between the base station and the mobile station is retransmitted due to factors such as deterioration of the transmission environment, a shift in the confidential parameter occurs in the base station transmission control unit (main (RLC / MAC layer) is effective only when detecting and correcting the deviation of the secret parameter. When the secret parameter shift occurs, the base station side alone corrects the input parameter serving as the secret key, so the change of the secret parameter cannot be notified to the mobile device side. For this reason, it is not known whether or not the secret parameter deviation has been resolved without listening to actual voice data. Furthermore, since the solution of the prior art is not a method of judging abnormal noise based on audio data, it is used as a transmission line when abnormal noise is not solved or abnormal noise is generated by a mechanism other than confidentiality deviation. Since no problem has occurred, there has been a problem that communication in an abnormal sound generation state is continued unless communication is disconnected by a user operation.

  SUMMARY An advantage of some aspects of the invention is that it provides a communication device and a communication method that can prevent a user from hearing an unpleasant sound when abnormal noise occurs.

In order to solve the conventional problems, a communication device according to the present invention includes a transmission / reception unit that transmits and receives a radio signal including audio data, a decoding process that converts a radio signal received by the transmission / reception unit into a digital signal, and the digital signal A transmission control unit that releases the confidential parameter of the signal and generates voice data after the release of the confidentiality, and the voice data after the release of the confidentiality generated by the transmission control unit based on the voice codec rule Performs encoding processing for converting into speech encoded data, determines whether the parameter of the converted speech encoded data is within a predetermined parameter range, and the parameter of the speech encoded data is within a predetermined parameter range If the determination that there is no on has been performed, and a sound control unit which makes a request for disconnection and re-transmission of the communication to the transmission control unit, the The voice control unit, when the adaptive codebook index is not in the range from 102/6 to 564/6 or the adaptive codebook Gain is not in the range from 0.0 to 1.2 among the parameters of the speech encoded data, It is determined that the parameter of the speech encoded data is not within a predetermined parameter range.

Further, the communication method of the present invention cancels the transmission / reception step for transmitting / receiving a radio signal including audio data, the decoding process for converting the radio signal received at the transmission / reception step into a digital signal, and the confidential parameter of the digital signal. A transmission parameter step for generating a confidential parameter cancellation process for generating voice data after the deciphering, and a code for converting the voice data after the deciphering generated by the transmission control step into voice encoded data based on a voice codec rule And whether or not the parameter of the converted speech encoded data is within a predetermined parameter range, and it is determined that the parameter of the speech encoded data is not within the predetermined parameter range. If the has a sound control step of performing a request for disconnection and re-transmission of the communication, and the voice control step Of the parameters of the speech coding data, the speech coding data when the Adaptive Codebook index is not in the range from 102/6 to 564/6 or when the Adaptive Codebook Gain is not in the range from 0.0 to 1.2. Is determined to be outside the predetermined parameter range.

  According to the present invention, communication can be disconnected when abnormal noise occurs, and it is possible to avoid making the user hear an unpleasant sound. Further, by automatically performing the re-transmission, it is highly possible that the generation of abnormal noise due to the secret parameter deviation will be eliminated at the next call, and the abnormal noise generation rate can be reduced.

The block diagram which shows the structure of the mobile apparatus in embodiment of this invention The flowchart explaining operation | movement of the mobile apparatus in embodiment of this invention The figure explaining the parameter range of encoded data

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a mobile device as an example of a communication device according to an embodiment of the present invention. As shown in FIG. 1, a mobile device 1 includes an antenna 2, a transmission / reception unit 3 that transmits and receives audio data by communicating with a base station, a transmission control unit 4 that inputs received audio data and performs decoding processing, and transmission An audio control unit 5 that encodes the decoded data received by the control unit into audio data, a speaker 7 that outputs the encoded audio data, and a microphone 6 that inputs the audio data are provided.

  The transmission control unit 4 performs a decoding process on the audio data received from the transmission / reception unit, a CRC determination, a voiced / non-voiced determination, and a secret parameter release process for the voice data. Here, the decoding process of audio data means that the base station side converts the audio data into the physical layer data format in advance, then converts the digital signal spread by the spreading code or scrambling code into a radio signal, and moves This refers to converting the radio signal received from the transmitter / receiver into a digital signal and multiplying the data transmitted to the device with a spreading code or a scrambling code to convert it into physical layer data before transmission. In addition, CRC determination means that when the base station converts voice data into the physical layer data format, the CRC bit added to detect a block error and the CRC bit received on the mobile station side and the physical layer This refers to determining whether or not there is an error in the data on the propagation path by checking the CRC bits calculated by the mobile station based on the received data. Also, the voiced / silent judgment is to judge whether the received voice data is voiced or silent based on the difference in the number of bits of the received physical layer data when the voice is voiced and silent. To do. Also, the secrecy parameter release processing of audio data is the physical layer data that is calculated by multiplying the physical layer data by the common counter value and the secrecy parameter between the base station and the mobile station that are the secret key. Refers to the release of secrecy.

  The voice control unit 5 performs a coding process and a parameter check of the coded data for the voice data after the deciphering received from the transmission control unit, and counts the number of mismatches after the parameter check of the coded data. Prepare. Further, the voice control unit 5 has a function of transmitting a communication disconnection and retransmission request to the transmission control unit 4 when the parameter check results of the encoded data do not match. Here, the encoding process is a process of rearranging the data based on the voice codec rule with respect to the voice data after the secrecy parameter release process, adjusting the gain, the pitch parameter, etc. , Encoded data or voice encoded data). The parameter check of encoded data refers to a range of values that can be set in advance for gain and pitch parameters when converting the above-described audio data into data that has been rearranged based on the audio codec rules into gain and pitch parameters. It means to check whether the value is within the regulation.

  FIG. 2 is a flowchart for explaining the operation of the mobile device in the embodiment of the present invention. As illustrated in FIG. 2, the transmission control unit 4 performs a decoding process on the audio data received by the transmission / reception unit 3. (Step S102). Next, the transmission control unit 4 performs CRC OK / NG and voice presence / absence determination for each wireless frame (20 msec) based on the decoding processing data (step S104). Next, the transmission control part 4 performs the process which returns to the process of step S102, when it is not CRC OK (step S106 NO). Moreover, the transmission control part 4 performs the process which progresses to the process of step S108, when it is CRC OK (step S106 YES). Next, the transmission control part 4 performs the process which returns to the process of step S102, when it is not audio | voice sound (namely, when audio | voice no sound). Specifically, when the number of bits of Class A of the decoding process data is 0, it is determined that the voice is not voiced (that is, voice is silent), and the process returns to the process of step S102 (NO in step S108). Moreover, the transmission control part 4 performs the process which progresses to the process of step S110, when audio | voice sound exists. Specifically, when the number of bits of Class A of the decoding process data is not 0, a process of proceeding to the process of step S110 as voice presence is performed (YES in step S108). Next, the transmission control unit 4 performs processing for canceling the confidential parameter of the audio data. Then, the CRC determination result is delivered to the voice control unit 5 together with the voice data subjected to the deciphering process. Thereby, the voice control unit 5 can know the CRC determination result and the voice data sound / silence state for each wireless frame data (step S110).

  Next, the voice control unit 5 performs an encoding process from the voice data received from the transmission control unit 4 (step S112). Next, the voice control unit 5 checks the parameters of the encoded data when the CRC is OK and there is sound from the above-mentioned CRC OK / NG information and voice sound / silence information. As an example of the parameter check determination of the encoded data, there are Adaptive codebook Index and Gain as shown in FIG. For example, the parameter settable range of each encoded data, such as Adaptive codebook Index and Gain, is defined in advance by the standard, and can be in the range of 0.0 to 1.2. By holding the parameter setting range information such as Adaptive codebook index and gain in the voice control unit 5, for example, when the CRC is OK and the voice is present, a value in a range that cannot be set for each encoded data parameter is set. If it is determined that the parameters of the encoded data do not match. With this configuration, in order to determine that the confidential parameter is shifted, not only the voice data encoded by the voice control unit 5 but also the CRC information from the transmission control unit and the voiced / silent information are combined. Parameter check can be performed. Encoded data may be set to a value outside the range of parameters that can be set when the confidentiality timing is out of alignment, and the confidential parameter deviation occurs when the value is determined by the parameter check of the encoded data Can be determined by the voice control unit 5. Further, since not only the decoding processing data of the transmission control unit 4 but also the encoded data is verified by the voice control unit 5, it is necessary to deal with cases of confidential parameter deviations other than the existing confidential parameter deviation (CFN deviation) case. (Step S114).

  Next, when the voice control unit 5 determines that the parameters do not match, the voice control unit 5 determines that a shift in the confidential parameter has occurred, transmits a disconnection request to the transmission control unit 4, and receives the request. The transmission control unit 4 executes this command and a retransmission request. With this configuration, the transmission control unit 4 disconnects and retransmits the voice communication in which the secrecy parameter shift occurs, so that the user can automatically disconnect and retransmit the communication without disconnecting. Thus, it is possible to reduce the occurrence of the deviation of the confidential parameter in the next communication (NO in step S116, step S122). On the other hand, if the voice control unit 5 determines that the parameters match, the process returns to the process of step S102 (YES in step S116). Note that the processing from step S118 to step S120 in FIG. 3 may be omitted.

  Next, a case where the processing from step S118 to step S120 in FIG. 22 is not omitted will be described. When the voice control unit 5 determines that the parameters do not match, the value of the mismatch counter is incremented by 1 and is compared with the bearer cut threshold (step S118 to step S120). If the mismatch counter is smaller than the bearer disconnection threshold (No at step S120), the process returns to step S102. If the mismatch counter is larger than the bearer cut threshold, the process proceeds to step S122 (Yes in step S120).

  As described above, the mobile device according to the embodiment of the present invention extracts characteristic information generated when a shift in the confidential parameter occurs during voice communication from the encoded data, and the transmission control unit in the mobile device As assist information, the information is passed to the voice control unit, and based on this information, the voice control unit determines whether or not abnormal noise is generated in the encoded data. Thereby, when abnormal noise occurs, it is possible to immediately disconnect the current communication, and it is possible to avoid making the user hear an unpleasant sound. Furthermore, by automatically performing re-transmission, it is highly possible that the occurrence of abnormal noise due to the shift in the secret parameter will be eliminated during the next call, and the abnormal noise generation rate can be reduced.

  In the above embodiment, an example of a mobile device such as a mobile phone has been described as the communication device, but the same applies to other communication devices.

  In the present invention, characteristic data generated when a deviation of a confidential parameter occurs during voice communication is passed to the voice control unit as assist information of the transmission control unit of the communication device, and the encoded data is encoded by the voice control unit based on this information. The presence or absence of abnormal noise is determined. Thereby, when abnormal noise occurs, it is possible to immediately disconnect the current communication, and it is possible to avoid making the user hear an unpleasant sound. Furthermore, by automatically performing re-transmission, it is highly possible that the occurrence of abnormal noise due to the shift in the secret parameter will be eliminated during the next call, and the abnormal noise generation rate can be reduced. For this reason, this invention is useful as a communication apparatus, a communication method, etc.

DESCRIPTION OF SYMBOLS 1 Mobile device 2 Antenna 3 Transmission / reception part 4 Transmission control part 5 Voice control part 6 Microphone 7 Speaker

Claims (4)

A transmission / reception unit for transmitting / receiving radio signals including audio data;
A transmission control unit that performs a decoding process for converting a radio signal received by the transmission / reception unit into a digital signal, and a secrecy parameter release process for canceling the secrecy parameter of the digital signal and generating audio data after deciphering;
Encoding processing for converting the speech data after the deciphering generated by the transmission control unit into speech encoded data based on a speech codec rule is performed, and the parameters of the converted speech encoded data are within a predetermined parameter range Audio that requests disconnection and re-transmission of communication to the transmission control unit when it is determined that the parameter of the encoded audio data is not within a predetermined parameter range. A control unit ,
The speech control unit may determine that, among the parameters of the speech encoded data, when the Adaptive Codebook index is not in the range from 102/6 to 564/6, or when the Adaptive Codebook Gain is not in the range from 0.0 to 1.2. And determining that the parameter of the speech encoded data is not within a predetermined parameter range.
Communication device. The speech control unit includes a mismatch counter that counts the number of times that the parameter of the speech encoded data is determined not to be within a predetermined parameter range, and the transmission control unit counts the transmission when the count value of the mismatch counter exceeds a predetermined number of times. Requests disconnection and retransmission of communication to the control unit
The communication apparatus according to claim 1 . The transmission control unit determines whether or not there is an error in the data on the propagation path by checking the CRC bits added to the digital signal, based on the OK / NG determination of CRC and the number of bits of the data of the digital signal A secret parameter cancellation process is performed for determining voiced and silent sections, and when the CRC is detected to be OK and a voiced section, the confidential parameters of the digital signal are canceled to generate voice data after the cancellation of the confidentiality. Do
The communication apparatus according to claim 1 or 2 . A transmission / reception step of transmitting / receiving a radio signal including audio data;
A transmission control step for performing a decoding process for converting the radio signal received in the transmission / reception step into a digital signal, and a secret parameter release process for releasing the secret parameter of the digital signal and generating voice data after release of the secret;
Encoding processing for converting the speech data after the deciphering generated by the transmission control step into speech encoded data based on a speech codec rule is performed, and the parameters of the converted speech encoded data are within a predetermined parameter range whether determined, if the parameters of the speech encoded data has been made determination that not within a predetermined parameter range, has a sound control step of performing a request for disconnection and re-transmission of communications, the ,
The speech control step is performed when the adaptive codebook index is not in the range from 102/6 to 564/6 or the adaptive codebook gain is not in the range from 0.0 to 1.2 among the parameters of the speech encoded data. And determining that the parameter of the speech encoded data is not within a predetermined parameter range.
Communication method.

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