KR20090020091A - Method for transmiting the data using the voice channel - Google Patents

Abstract

A data communications method and an apparatus thereof using a voice channel solving a problem that transfer efficiency at a section in which the voice activity is low falls down are provided to maximize the transmission efficiency of the voice channel. Data transfer apparatus using a voice channel produces a voice frame to a predetermined TTI(Transmission Time Interval). An apparatus determines whether to insert predetermined data stored in advance into the voice frame(S830). In case the insertion of data is possible, the apparatus reorganizes the voice frame(S840). The voice frame which is re-organized is transmitted from the apparatus through the voice channel(S850).

Description

Method and device for transmitting data using voice channel {Method for Transmiting the Data Using the Voice Channel}

The present invention relates to a data transmission method using a voice channel, and more particularly, in a mobile terminal supporting a variable data rate for a voice channel, a voice activity and a wireless channel environment The present invention relates to a data transmission method using a voice channel capable of maximizing frequency utilization efficiency by inserting and transmitting data into a voice channel.

In a mobile communication network, a voice communication service is one of the most common communication services, and is basically a function provided in all mobile terminals.

In particular, a voice codec method of digitizing an analog voice signal, encoding the same by using a predetermined coding method, and transmitting the same has been applied to various mobile communication systems.

The most basic voice codec is a PCM (Pulse Code Modulation) method used in a general wired telephone network. In PCM, each sample is represented by a string of pulses. If you create a WAV file on your PC, the 8KHz, 16-bit mono will produce 16KB of data per second.

However, applying the PCM scheme to a mobile communication network as it is has a problem in that the bandwidth use efficiency of a wireless communication channel is greatly reduced.

Currently, in a mobile communication method such as CDMA or WCDMA, a caller's voice model is modeled at the calling party and the coefficients and input signals of the modeling are simultaneously transmitted to the receiving party.

The receiving side applies the received modeling coefficients and the input signal to the corresponding speech signal model and outputs the same through the speaker.

Modeling of a speech signal uses a method called linear predictive coding (LPC). Here, LPC uses the principle that the current signal can predict the future signal.

Voice signals change over long periods of time, but they are nearly cyclical for small periods of time (eg, 20 ms for QCELP, EVRC, FR, and EFR). That is, the voice signal has a feature that does not change much compared to the past signal in a short interval. Based on the same principle as described above, a human speech structure can be statistically modeled.

The vocal tract model represents the characteristics of the resonance signal of the vocal tract as a filter. When a predetermined input signal is applied to the filter, speech can be obtained.

In general, the voiced sound is modeled as a constant pulse train, and the portions that characterize the unvoiced sound are modeled as Gaussian noise. As such, speech synthesis passes the input signal through the oral model to convolve the input pulse or input signal with a filter and output it through the speaker.

In the actual commercial vocoder implementation, the method of coding and transmitting the difference between the signal passed through the model and the actual signal is used again.

Typical voice codecs used in CDMA include QCELP (QualComm Code Excited Linear Predictive Coding) and Enhanced Variable Rate Codec (EVRC). A typical voice codec used in WCDMA is AMR codec.

QCELP is a CELP vocoder developed by Qualcomm. In general, QCELP 8 Kbps and QCELP 13 Kbps are used. Here, QCELP 8Kbps is not used well because the sound quality is poor.

QCELP supports Variable Bit Rate in four types: full rate, half rate, quarter rate, and eighth bps, depending on voice activity.

Enhanced Variable Rate Codec (EVRC) is based on Residual Code Excited Linear Predictive Coding (RCELP) and has a bit rate of 8 Kbps. In particular, EVRC has better noise suppression effect than the QCELP 8K.

EVRC also supports variable bit rates through four bit rates: full rate, half rate, quarter rate, and eighth bps, depending on voice activity.

AMR (Adaptive Multi-Rate) speech codec (Codec) is a speech codec scheme adopted as a standard of ^{3GPP (3 rd Generation Partnership Project)} .

In general, bit transmission error in digital mobile communication is the biggest cause of call quality degradation, and AMR is one of the effective voice codec methods to solve this problem.

In other words, ARM uses a method of improving the overall sound quality by varying the bits for voice compression and the bits for channel coding among the input bits according to the current bit error rate.

For example, AMR can increase the error correction capability by allocating many bits to channel coding in high bit error environments, and improve speech compression performance by allocating many bits to the voice compressor in low bit error channel environments. .

In addition, according to the current wireless channel environment and the voice activity of the inputted voice signal, the AMR is MR475 (4.75kbps), MR515 (515kbps), MR59 (5.9kbps), MR67 (6.7kbps), MR74 (7.4). kbps), MR795 (7.95kbps), MR102 (10.2kbps), and MR122 (12.2kbps) are supported in eight modes, which can support variable data rates.

Recently, in order to provide better voice quality, 3GPP has added a WideBand AMR (WB-AMR) method, which is sampled at 16KHz.

In general, voice codecs that support variable bit rates, such as AMR and EVRC, have a feature of transmitting at a low bit rate in a low voice activity period, that is, in a background noise period.

However, in the case of CDMA or WCDMA, since a fixed spreading factor (SF) is allocated to a voice service, transmission efficiency in a low voice activity range is inferior.

An object of the present invention for solving the problems of the prior art as described above is a data transmission method using a voice channel capable of maximizing the transmission efficiency of the voice channel by inserting and transmitting data in a low voice activity interval in the mobile terminal To provide.

Another object of the present invention is that when data is inserted into a voice channel in a mobile terminal, by receiving predetermined data identification information indicating that data is being transmitted in a corresponding transmission interval, the called party can receive data. It is to provide a data transmission method using a voice channel.

It is also an object of the present invention to provide a mobile terminal capable of transmitting data to a called party during a voice call by providing a means for reconstructing a voice frame upon insertion of data on the voice channel.

It is also an object of the present invention to provide a predetermined user interface for designating or reserving data to be transmitted through a voice channel.

In addition, the present invention provides a data transmission method using a voice channel capable of minimizing an error occurring during transmission of data included in the voice channel by considering not only voice activity but also current radio channel environment information.

Other objects of the present invention will be readily understood through the following description of the embodiments.

In order to achieve the above object, according to an aspect of the present invention, a method for transmitting data using a voice channel in a mobile terminal is disclosed.

A data transmission method using a voice channel according to the present invention includes a first step of generating a voice frame at a predetermined transmission time period; A second step of determining whether or not predetermined data stored in advance can be inserted into the voice frame; A third step of reconstructing the voice frame when the data can be inserted as a result of the determination; And transmitting the reconstructed speech frame through the speech channel.

According to an aspect of the present invention, a method for receiving data using a voice channel in a mobile terminal is disclosed.

A data receiving method using a voice channel according to the present invention includes a first step of generating a voice frame by decoding a wireless signal received through the voice channel; A second step of confirming whether data is included in the voice frame; And extracting at least one of voice information and data insertion information from the voice frame according to the confirmation result.

In the above description, only a data transmission method using a voice channel is described in the mobile terminal, but the above-described methods are recorded as a program consisting of typed instructions, and the program may be provided as a recording medium that can be read by the electronic device.

According to an embodiment of the present invention, a mobile terminal capable of transmitting and receiving data using a voice channel is provided.

According to an aspect of the present invention, a mobile terminal includes: a frame type determination unit calculating a voice activity of a voice signal input for a predetermined time and determining a frame type using the calculated voice activity; A speech codec that encodes the speech signal according to the determined frame type to generate a speech frame or to decode the encoded speech frame; A reconstruction scheduler which determines whether predetermined data can be inserted into the speech frame and transmits the speech frame to a baseband processor, or reconstructs the speech frame and transmits the speech frame to the baseband processor; And a voice frame analyzer extracting at least one of voice information and data from the voice frame according to whether the voice frame received from the baseband processor is inserted.

The present invention has an advantage of providing a data transmission method using a voice channel capable of maximizing the transmission efficiency of the voice channel by inserting and transmitting data in a low voice activity period in the mobile terminal.

In addition, when the mobile terminal inserts data into a voice channel according to voice activity, the present invention transmits predetermined voice identification information indicating that data is being transmitted in a corresponding section to the called party. It is an advantage to provide a data transmission method using a voice channel capable of receiving data through.

In addition, the present invention has an advantage of providing a mobile terminal capable of transmitting data to a called party during a voice call by providing a means for reconstructing a voice frame when inserting data on the voice channel.

In addition, the present invention inserts and transmits data in an available section of the voice channel, thereby maximizing bandwidth efficiency of the wireless communication channel and reducing data communication charges.

In addition, the present invention has an advantage of providing a user-friendly mobile terminal by providing a predetermined user interface for real-time designation or reservation of data to be transmitted through a voice channel.

In addition, the present invention has an advantage of providing a retransmission procedure for data in which an error occurs by using a sequence number and an error detection code for data included in a voice channel.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The term and / or includes a combination of a plurality of related items or any item of a plurality of related items. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprising" or "mounted" and "mounted" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, one Or other features or numbers, steps, operations, components, parts or combinations thereof in any way should not be excluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

Hereinafter, a preferred embodiment of a data transmission method and an apparatus using a voice channel according to the present invention will be described in detail with reference to the accompanying drawings.

Before describing the data transmission method using the voice channel disclosed in the present invention, a representative voice codec of mobile communication will be described.

AMR is a GSM standard vocoder established by the European Telecommunications Standards Institute (ETSI) and is based on Algebraic Code Excited Linear Predictive Coding (ACELP).

Vocoders such as full rate (FR) and enhanced full rate (EFR), which have been used previously, have a fixed bit rate, but in AMR, various codec bit rates are selectively used according to channel characteristics and voice activity.

The detailed codecs used for narrowband AMR are MR475 (4.75 kbps), MR515 (515 kbps), MR59 (5.9 kbps), MR67 (6.7 kbps), MR74 (7.4 kbps), MR795 (7.95 kbps), MR102 (10.2 kbps), There are eight modes of MR122 (12.2 kbps).

In other words, the narrowband AMR codec defined in the 3GPP standard is sampled at 8KHz and is a variable bit rate codec (Variable Bit) capable of providing various transmission rates in the range of 4.75 kbit / s to 12.2 kbit / s. Rate Codec).

In addition, 3GPP defines WideBand AMR (WB-AMR), which is sampled at 16KHz, to provide high quality voice call service.

1 is a general AMR codec frame structure defined in the 3GPP standard.

Referring to FIG. 1, the AMR codec frame 100 may be largely classified into a header 110, auxiliary information 120, and a core frame 130.

The AMR header 110 includes a frame type 112 and a frame quality indicator 114.

Here, the frame type 112 is a field used to indicate one of eight AMR codec modes and has a length of 4 bits.

The frame quality indicator 114 has a length of 1 bit and is a field for indicating whether an error exists in data included in a corresponding AMR codec frame.

For example, if the value of the frame quality indicator 114 is 0, it may indicate a frame in which an error exists, and if it is 1, it may indicate a normal frame.

The auxiliary information 120 is information used for the purpose of mode adaptation and error detection. The auxiliary information 120 includes a mode indicator 122, a mode request 124, and a codec Cyclic Redundancy Check 126. It is composed.

The core frame 120 is composed of encoded speech parameter bits or comfort parameter frames in the case of encoded speech parameter bits.

Here, in the case of a comfort noise frame, the comfort parameter bits replace class A 132 of the core frame while class B 134 and class C 136 are omitted.

In particular, it should be noted that the number of bits allocated to each class constituting the core frame is variable according to the frame type.

2 is a view for explaining a core frame structure for each frame type according to the prior art.

As shown in FIG. 2, an AMR core frame defined in 3GPP TS 25.101 v6.00 consists of eight frame types 210 and an AMR codec mode 220.

Each frame type 220 defines an AMR codec mode 220, a total number of bits 230, a class A 240, a class B 250, and a class C 260 corresponding to the frame type.

Here, the total number of bits 230 is the number of bits of voice data allocated to the core frame, and is calculated as the sum of the class A 240, the class B 250, and the class C 260.

In particular, it can be seen that the number of bits 270 allocated to class C 260 of frame type 0 to frame type 5 is all zero.

That is, in the case of a low speed AMR codec mode 220 determined according to channel environment and voice activity, wherein the low speed codec mode is a codec mode corresponding to frame type 0 to frame type 5, for class C 260. You can see that no data exists.

Therefore, in the present invention, when a frame type having a class C 260 of 0 bits is selected for a corresponding transmission period in the AMR codec, specific data designated by a user in the corresponding frame is included in the short message, multimedia message, The present invention proposes a data transmission method using a voice channel capable of transmitting a combination of a sound source file and the like.

3 is a diagram illustrating a core frame structure for each frame type according to an embodiment of the present invention.

As shown in FIG. 3, it can be seen that the core frame structure according to the present invention further includes frame types 8 to 13 in the core frame structure shown in FIG. 2.

In general, the transmission time interval (TTI) for the voice channel is 20ms, and the maximum data rate that can be provided through the narrowband AMR codec is 12.2Kbps. Therefore, the maximum data size that can be included in one core frame is 244 bits (12.2 Kbps / 50frame = 244 bits / frame).

In WCDMA, an Orthogonal Variable Spreading Factor (OVSF) is used as an encoding code for channel spreading, and an Orthogonal Code having Spreading Factor (128) is generally used to provide a voice call service.

However, in case of AMR, since the amount of voice data transmitted from the corresponding TTI is variable according to voice activity, the maximum transmission rate that can be transmitted through SF 128 is not continuously used during a voice call.

The core frame structure according to an embodiment of the present invention is a frame type in which the total number of data bits of the core frame is 244 bits for a frame having 0 bits allocated to class C in consideration of the features of the voice channel and the AMR codec. It may be included in the core frame structure.

For example, frame type 8 may be defined to allocate 149 bits instead of 0 bits allocated to class C 330 of existing frame type 0. In this case, the total number of bits of frame type 8 is 244 (42 + 53 + 149) bits.

In the case of WCDMA, each class included in the core frame may be allocated a separate transport channel, for example, class A may be allocated to DCH1 (Dedicated Channel # 1), class B to DCH2, and class C to DCH3. Yes-The transport format information for each class can be shared between mobile terminals in the call setup phase.

Of course, it is obvious to those skilled in the art that transmission format information for each class should be shared between the mobile terminal and the base station.

In the following description, a case where a first mobile terminal and a second mobile terminal connected to base station A makes a voice call in a WCDMA network, for example, the first mobile terminal sends frame type information of the core frame to the second mobile terminal. I will briefly explain the process of delivery.

The first mobile terminal generates transport format combination information corresponding to a frame type determined at every transmission time period, and the generated transport format combination information is transmitted to a transport format combination indicator (TFCI) of uplink (UL) dedicated physical control channel (DPCCH). Send to the base station A through the field.

The base station A decodes the TFCI of the UL DPCCH, generates a voice frame, and transmits the generated voice frame to the base station controller.

When the base station A receives the previously transmitted voice frame from the base station controller, the base station A generates a TFCI corresponding to the corresponding voice frame.

Base station A maps the generated TFCI to DL (Downlink) DPCCH and transmits it to the second mobile terminal.

The second mobile terminal may extract the TFCI from the received DL DPCCH and determine the frame type of the corresponding speech frame through the extracted TFCI.

If the frame type is a frame type including data, for example, may be any one of frame type 8 to frame type 13 illustrated in FIG. 3, the inserted data may be extracted from the corresponding voice frame. .

4 is a structure of class C used for data insertion according to an embodiment of the present invention.

Referring to FIG. 4, class C includes a data type 410 field, a sequence number 420 field, a data length 430 field, a data 440 field, a padding 450 field, and an error detection code 460. It may include.

In the following description, when data is inserted into a voice frame, the information included in class C will be referred to as 'data insert information'.

Here, the data type 410 is used to distinguish the type of information included in the data 440 field. For example, the data type may include a short message type, a multimedia message type, a sound source file type, and the like.

The sequence number 420 is a sequence number assigned to segmented packets when data cannot be transmitted in one class C.

The receiving mobile terminal may sequentially reassemble the packets using the received sequence numbers.

The data length 430 field is a field for indicating the length of data 440 included in class C.

The data 440 field and the padding 450 field have variable lengths within a predefined payload region. Herein, the padding 450 may be filled with a predetermined specific pattern, for example, all zeros.

The error detection code 460 is an error detection code for determining whether an error exists in the payload region of the class C, and may be a cyclic redundancy check (CRC) code having a predetermined length.

When an error is detected when the CRC code is detected, the receiving mobile terminal may request the transmitting mobile terminal to retransmit data corresponding to the corresponding sequence number.

According to another embodiment of the present invention, the class C used for data insertion may further include a predetermined retransmission identifier indicating that the data is retransmitted data.

For example, the retransmission identifier may have a length of 1 bit, and may indicate that 0 is new data and 1 is retransmission data.

5 is a view for explaining the characteristics of the voice call channel supporting a variable transmission rate according to the prior art.

As shown in FIG. 5, a general voice call channel may have different Voice Activity (VA) for each Transmission Time Interval, and thus, there is an idle band.

In particular, in the case of voice communication, the resources allocated during the initial call setup do not change until the call ends, and there is a problem in that the allocated resources cannot be effectively used in a section in which voice activity is low. That is, the conventional voice call channel supporting the variable transmission rate has a problem in that there are many idle bands 540 when the voice activity is low, compared to the voice use band 530.

Referring to FIG. 5, since the voice activity is 0.8, the first transmission section 510 has a high utilization efficiency for allocated resources. On the other hand, the third transmission section 520 has a feature that the utilization efficiency of the allocated resources is very low since the voice activity is 0-for example, the silent section.

6 is a view for explaining a feature of a voice call channel supporting a variable transmission rate according to an embodiment of the present invention.

As shown in FIG. 6, the present invention is characterized by using the idle band 530 existing according to voice activity for transmission of specific data. That is, the present invention can simultaneously provide a voice communication service and a data communication service through one voice call channel.

Therefore, the present invention has an advantage of maximizing the utilization efficiency of resources allocated to the voice call channel by using the idle band 540 shown in FIG. 5 for data transmission.

In the following description, a band used for data transmission among the bands allocated to the voice call will be referred to as a data transmission band 620.

7 is a diagram illustrating a short message transmission procedure using a voice channel according to an embodiment of the present invention.

More specifically, FIG. 7 illustrates that when a voice call channel is established between the first mobile terminal 710 and the second mobile terminal 720, the first mobile terminal 710 transmits a short message through the established voice call channel. FIG. 2 is a diagram illustrating a procedure for transmitting to the second mobile terminal 720. Referring to FIG.

In the case of WCDMA, a voice call channel includes a signaling radio bearer (hereinafter referred to as SRB) for transmitting and receiving a control message with a mobile communication system and a radio bearer (hereinafter referred to as a radio bearer) for transmitting actual voice information. , RB).

In particular, it should be noted that the present invention transmits the short message through the RB rather than the SRB assigned to the voice call channel.

8 is a flowchart illustrating a short message transmission procedure using a voice channel according to an embodiment of the present invention.

In more detail, FIG. 8 is a flowchart illustrating a procedure of transmitting a short message through a voice channel from a first mobile terminal to a second mobile terminal.

The first mobile terminal establishes a voice call channel through a predetermined call processing procedure with the second mobile terminal (S810).

Here, when the voice call channel is set, the first mobile terminal periodically generates AMR codec frames by AMR encoding the voice signal input through the microphone.

When the first mobile terminal receives a predetermined short message transmission request signal (S820), whether the first mobile terminal can insert the short message requested to be transmitted into the current voice frame (eg, an AMR codec frame) according to the current voice activity and the wireless channel environment. It is determined whether or not (S830).

If it is determined that the short message can be inserted, the first mobile terminal performs a voice frame reconstruction procedure for inserting the short message into the corresponding voice frame (S840).

The first mobile terminal transmits the reconstructed voice frame to the second mobile terminal through the voice call channel set up in step 810 (S850).

If it is determined in step 830 that it is impossible to insert the short message, the first mobile terminal transmits the generated AMR codec frame to the second mobile terminal through predetermined baseband processing.

9 is a flowchart illustrating a procedure of receiving a short message using a voice channel according to an embodiment of the present invention.

More specifically, FIG. 9 illustrates a method in which the second mobile terminal extracts the short message included in the voice call channel when the first mobile terminal transmits the short message to the second mobile terminal through the voice call channel. It is a figure for demonstrating.

The second mobile terminal establishes a voice call channel with the first mobile terminal through a predetermined call processing procedure (S910).

The second mobile terminal determines whether a short message is included in the received voice frame (S920).

As a result of the determination, when the short message is included in the corresponding speech frame, the second mobile terminal extracts the AMR codec frame and the short message from the corresponding speech frame (S930).

The second mobile terminal may store the extracted short message in a predetermined message inbox and output a predetermined reception notification message (S940).

The second mobile terminal generates a voice signal through decoding of the AMR codec frame extracted in step 930, and outputs the generated voice signal through a speaker (S960).

In step 920, if the short message is not included in the corresponding speech frame, the second mobile terminal extracts an AMR codec frame from the received speech frame (S950) and then generates a speech generated by decoding the extracted AMR codec frame. The signal is output through the speaker (S960).

10 is a flowchart illustrating a short message transmission procedure using a voice call channel according to an embodiment of the present invention.

Referring to FIG. 10, when the voice call channel is set, the first mobile terminal 1010 and the second mobile terminal 1020 transmit and receive voice through the set voice call channel (S1010).

Here, the voice call channel may be composed of a radio bearer (RB) and a signaling radio bearer (SRB), and a user voice signal is transmitted through the RB.

At this time, the mobile terminal AMR-codes the voice signal input through the microphone to generate a predetermined voice frame every transmission time period, for example, 20 ms in the case of WCMDA.

The mobile terminal determines an appropriate frame type according to the voice activity and the radio channel environment during the corresponding transmission time period, and the mobile terminal reconstructs the voice frame according to the determined frame type.

The voice frame is transmitted to the counterpart mobile terminal through predetermined baseband processing and radio frequency processing.

If the first mobile terminal 1010 receives a predetermined short message transmission request signal from the user during a voice call (S1020), the first mobile terminal 1010 transmits the short message requested to be transmitted on the recently generated voice frame. It is determined whether the insertion is possible (S1040).

Here, whether the short message can be inserted may be determined in consideration of voice activity corresponding to the corresponding voice frame and the current wireless channel environment.

For example, even if the voice activity is low, the first mobile terminal 1010 may not insert a short message in a corresponding voice frame when the wireless channel environment is bad.

On the other hand, when the voice activity is low and the wireless channel environment is good, the first mobile terminal 1010 may insert a short message into the corresponding voice frame and transmit the short message to the second mobile terminal 1020.

In step 1040, if it is determined that the short message can be inserted, the first mobile terminal 1010 inserts the short message into the corresponding voice frame and transmits the short message to the second mobile terminal 1020 (S1070).

Here, the first mobile terminal 1010 needs to select an appropriate frame type according to the size of the short message, and reconfigures the corresponding voice frame into a voice frame into which the short message is inserted according to the selected frame type.

In other words. The first mobile terminal 1010 may generate a new voice frame including the user's voice information and a short message through the reconstruction of the voice frame.

In step 1040, when it is impossible to insert the short message requested to be transmitted to the corresponding voice frame, the first mobile terminal 1010 transmits to the second mobile terminal 1020 without reconfiguring the corresponding voice frame (S1050). . Thereafter, the first mobile terminal 1010 may determine whether the short message can be inserted into the next generated voice frame.

The second mobile terminal 1020 decodes the voice frame at every transmission time period through radio frequency processing and baseband processing (S1080).

The second mobile terminal 1020 determines whether a short message is included in the decoded voice frame (S1082).

In the case of WCDMA, the second mobile terminal 1020 may determine whether the short message is included using the TFCI corresponding to the corresponding speech frame received through the DL DPCCH.

That is, the second mobile terminal 1020 may check the frame type through the TFCI, and may determine whether the short message is included in the voice frame according to the frame type.

As a result of the determination, when the short message is included in the speech frame, the second mobile terminal 1020 extracts the speech information (for example, may be an AMR codec frame) and the short message from the speech frame, and extracts the short text. The message may be stored in a predetermined recording area (S1084). In this case, the extracted voice information may be decoded through a voice decoder provided in the second mobile terminal 1020 and reproduced through a speaker (S1086).

In step 1082, when the short message is not included in the decoded voice frame, the second mobile terminal 1020 reproduces the decoded voice frame using the AMR decoder.

11 is a block diagram of a mobile terminal providing data transmission using a voice call channel according to an embodiment of the present invention.

As shown in FIG. 11, the mobile terminal 1100 according to the present invention includes a microphone 1102, a frame type determiner 1104, a voice encoder 1106, a data transmission scheduler 1108, and a voice frame reconstruction unit 1112. ), Baseband processor 1114, radio frequency processor 1116, antenna 1118, control message processor 1120, voice frame analyzer 1122, voice decoder 1124, speaker 1126, sound file playback The unit 1128, a data processor 1130, and a display unit 1132 may be included.

Here, it should be noted that the speech encoder 1106 and speech decoder 1124 may be composed of one module, for example, a speech codec.

In particular, the speech codec according to the present invention may support an adaptive variable transmission rate.

In the following description, a procedure for generating and transmitting a voice frame in a mobile terminal according to an embodiment of the present invention will be described in detail with reference to FIG. 11.

Referring to FIG. 11, the frame type determiner 1104 also calculates voice activity of a user voice input through the microphone 1102, and uses the calculated voice activity and wireless channel environment information measured by the baseband processor 1114. Frame type of the audio frame is determined.

Herein, the frame type may be determined for every transmission time interval (TTI) of the voice frame, and the determined frame type may be provided to the data transmission scheduler 1108 and the voice encoder 1106.

In addition, the frame type determiner 1104 may provide not only the frame type but also voice activity and radio channel environment information to the data transmission scheduler 1108.

The voice encoder 1106 generates a voice frame by intercoding the voice signal according to the received frame type.

In particular, the voice encoder 1106 according to the present invention supports a variable transmission rate such as AMR.

The data transmission scheduler 1108 may determine whether data requested to be transmitted may be inserted into a corresponding voice frame using at least one of the frame type, voice activity, and wireless channel environment information received from the frame type determiner 1104. .

Here, the data may include a short message, a sound source file, a multimedia message, and the like, and a unique data type identifier may be defined for each data type.

If specific data can be inserted into the corresponding speech frame, the data transmission scheduler 1108 may determine a new frame type according to the data insertion, hereinafter referred to as a 'reconstructed frame type'.

The data transmission scheduler 1108 may provide the voice frame reconstruction unit 1112 with the determined reconstruction frame type, data type identifier, data length identifier, and data start address.

In the following description, the reconstruction frame type, data type identifier, data length identifier, and data start address will be simply referred to as 'voice frame reconstruction information'.

Here, the data length identifier indicates the size of the data to be inserted, and the data start address indicates relative address information on the recording medium in which the data is stored, where the recording medium is the data storage unit 1110.

On the other hand, when it is impossible to insert specific data into the corresponding speech frame, the data transmission scheduler 1108 provides a predetermined control signal to the speech frame reconstruction unit 1112 indicating that there is no data to be reconstructed in the corresponding transmission time interval. can do.

According to another embodiment of the present invention, when the speech frame reconstruction unit 1112 does not receive the speech frame reconstruction information from the data transmission scheduler 1108 for a predetermined time, the speech frame corresponding to the corresponding transmission time period is not reconstructed. You can judge that you do not.

The speech frame reconstruction unit 1112 may reconstruct the speech frame using the speech frame reconstruction information received from the data transmission scheduler 1108 and the speech frame received from the speech encoder 1106.

The speech frame reconstruction unit 1112 transmits the reconstructed speech frame information to the baseband processor 1114, and the baseband processor 1114 transmits a predetermined baseband processed signal for the received speech frame to the radio frequency processor 1116. ) Can be sent.

According to another embodiment of the present invention, the data transmission scheduler 1108 and the voice frame reconstruction unit 1112 may be configured as a single module, which will be referred to as a reconstruction scheduler in the following description.

In other words, the reconstruction scheduler includes means for determining whether data can be inserted into the speech frame, means for generating speech frame reconstruction information if the data can be inserted, speech frame reconstruction information generated and the speech frame generated by the speech encoder 1106. Means for generating a reconstructed speech frame using the means, means for transmitting the generated reconstructed speech frame to the baseband processor 1114, and the like.

In addition, when the reconfiguration scheduler receives a predetermined retransmission control message indicating that an error has occurred in the data previously transmitted from the baseband processor 1114, the reconfiguration scheduler may provide a means for retransmitting the corresponding data.

The baseband processor supporting the WCDMA scheme according to an embodiment of the present invention includes error detection code insertion (CRC attachment), channel coding, interleaving, and transport channel multiplexing defined in the 3GPP standard. ), Rate matching, physical channel mapping, spreading, scrambling, modulation, and the like.

In particular, the baseband processor 1114 may transmit the core frame format information of the reconstructed speech frame to the receiving mobile terminal through a predetermined physical control channel.

For example, in the case of WCDMA, the physical control channel may be a UL DPCCH, and the baseband processor 1114 receives the core frame format information of the voice frame into which data is inserted using the TFCI field defined in the UL DPCCH. It can transmit to the side mobile terminal.

The receiving mobile terminal can obtain the core frame format information of the corresponding speech frame (that is, the frame type of the speech frame) by decoding the TFCI of the DL DPCCH received through the base station. You can check whether or not.

The radio frequency processor 116 may up-convert the received baseband signal to a predefined radio frequency band and provide the received baseband signal to the antenna 118.

In the following description, a process of extracting data included in a voice frame by decoding a wireless signal introduced into an antenna 118 by a mobile terminal according to an embodiment of the present invention will be described in detail with reference to FIG. 11.

Referring to FIG. 11, the radio frequency processor 1116 down-converts a radio signal received from the antenna 1118 to generate a baseband signal.

The baseband processor 1114 may baseband process the baseband signal received from the radio frequency processor 1116 to obtain a voice frame, and transmit the acquired voice frame to the voice frame analyzer 1122.

The voice frame analyzer 1122 may check whether data is included in the received voice frame.

If data is included in the received voice frame, the voice frame analyzer 1122 may extract voice information and data information from the voice frame.

The voice frame analyzer 1122 may transmit the extracted voice information and the data information to the voice decoder 1124 and the data processor 1130, respectively.

The data processor 1130 may display the received data information on the display unit 1132, and extract actual data included in the data information and store the data in a predetermined recording area of the data storage unit 110.

Here, the data information may include at least one of the data type 410, the sequence number 420, the data length 430, the data 440, and the error detection code 460 illustrated in FIG. 4.

In addition, the data processor 1130 may determine whether the data 440 is an error by using the received error detection code 460.

If an error occurs in the specific data, the data processor 1130 may transmit a predetermined retransmission request signal including the sequence number 420 corresponding to the data in which the error occurs to the data transfer scheduler 1108. .

In this case, when receiving the retransmission request signal, the data transmission scheduler 1108 may generate a retransmission request message requesting retransmission of data corresponding to the received sequence number and transmit the retransmission request message to the control message processor 1120.

When the control message processor 1120 receives the retransmission request message, the control message processor 1120 may transmit a mapping to the baseband processor 1114 by mapping to a predefined transport channel, where the transport channel may be a transport channel allocated for the SRB.

The baseband processor 114 may map the retransmission request message received through the corresponding transport channel to the physical channel and transmit the mapped retransmission request message to the counterpart mobile terminal.

The voice decoder 1124 may decode the received voice information to generate a voice signal, and output the generated voice signal through the speaker 1126.

The sound source file reproducing unit 1128 reads and reproduces the requested sound source file from the data storage unit 1110, and the reproduced signal may be output through the speaker 1126.

For example, if a music file playback unit 1128 is requested to play background music during a voice call, the sound source file playback unit 1128 may read out the background music from the data storage unit 1110 and play it back.

In this case, the reproduced background music may be mixed with the voice signal and input to the microphone 1102, and the counterpart mobile terminal user may listen to the background music included in the voice signal.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

1 is a generic AMR codec frame structure as defined in the 3GPP standard.

FIG. 2 is a diagram for explaining a core frame structure for each frame type defined in the 3GPP standard. FIG.

3 is a view for explaining a core frame structure for each frame type according to an embodiment of the present invention.

4 is a structure of class C used for data insertion according to an embodiment of the present invention.

5 is a diagram for explaining characteristics of a voice call channel supporting a general variable transmission rate.

6 is a diagram for explaining characteristics of a voice call channel supporting a variable transmission rate according to an embodiment of the present invention.

7 is a diagram illustrating a short message transmission procedure using a voice channel according to an embodiment of the present invention.

8 is a flowchart illustrating a short message transmission procedure using a voice channel according to an embodiment of the present invention.

9 is a flowchart illustrating a procedure of receiving a short message using a voice channel according to an embodiment of the present invention.

10 is a flowchart illustrating a short message transmission procedure using a voice call channel according to an embodiment of the present invention.

11 is a block diagram of a mobile terminal providing data transmission using a voice call channel according to an embodiment of the present invention.

* Key Drawing

112: frame type

130: core frame

136: class C

410: data type

420: Sequence Number

460: error detection code

540: idle band

620: data transmission band

1104: frame type determination unit

1106: Data Transfer Scheduler

1112: voice frame reconstruction unit

1122: voice frame analysis unit

1130: data processing unit

Claims (17)

In the method for transmitting data using a voice channel in a mobile terminal, Generating a voice frame at a predetermined transmission time period; A second step of determining whether or not predetermined data stored in advance can be inserted into the voice frame; A third step of reconstructing the voice frame when the data can be inserted as a result of the determination; And A fourth step of transmitting the reconstructed speech frame through the speech channel Data transmission method using a voice channel in a mobile terminal comprising a. The method of claim 1, The first step is Measuring voice activity on an input voice signal; Selecting any one of a plurality of predefined frame types according to the measured voice activity; And Generating a voice frame corresponding to the selected frame type Data transmission method using a voice channel in a mobile terminal comprising a. The method of claim 2, The first step is And acquiring radio channel environment information, wherein the frame type is selected using the voice activity and the radio channel environment information. The method of claim 1, The voice frame is a data transmission method using a voice channel in a mobile terminal, characterized in that it comprises a core frame supporting a variable transmission rate (variable transmission rate). The method of claim 4, wherein The core frame includes a plurality of classes, and in the second step, when there is a class that does not include voice information among the classes, it is determined that the data can be inserted into the voice frame. Data transmission method using the voice channel of the. The method of claim 5, If there is a class that does not include voice information among the classes, determining whether the current wireless channel environment is suitable for transmitting the voice frame into which the data is inserted. Data transmission method using voice channel. The method of claim 1, The third step is Calculating a number of bits insertable into the speech frame; Selecting a reconstructed frame type in consideration of the calculated number of bits; And Inserting data insertion information corresponding to the data into the voice frame according to the selected reconstruction frame type; Data transmission method using a voice channel in a mobile terminal comprising a. The method of claim 7, wherein The data insertion information is A data type field for identifying a data type; A sequence number field for providing sequence information of the divided data; A data length field indicating a length of data to be inserted; A data field for transmitting actual data; And Error detection code field to check data integrity A data transmission method using a voice channel in a mobile terminal, characterized in that it comprises at least one of. The method of claim 1, The method of claim 4, wherein the core frame format information of the reconstructed speech frame is transmitted through a predetermined physical control channel associated with the speech channel. The method of claim 1, The core frame format information is transmitted by being mapped to a transport format combination indicator of an uplink dedicated physical control channel defined in the 3GPP standard. Data transmission method using In the method for receiving data using a voice channel in a mobile terminal, Generating a voice frame by decoding the wireless signal received through the voice channel; A second step of confirming whether data is included in the voice frame; And A third step of extracting at least one of voice information and data insertion information from the voice frame according to the confirmation result; Data receiving method using a voice channel in a mobile terminal comprising a. The method of claim 11, The first step is Decoding a transport format combination indicator by decoding the physical control channel of the voice channel; And Generating the speech frame using a frame type mapped to the decoded transmission format combination indicator; Data receiving method using a voice channel in a mobile terminal comprising a. The method of claim 12, In the second step, it is determined whether the data is included through the frame type, the data receiving method using a voice channel in a mobile terminal. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 1 to 13 on a computer. A frame type determiner which calculates a voice activity of a voice signal input for a predetermined time and determines a frame type using the calculated voice activity; A speech codec that encodes the speech signal according to the determined frame type to generate a speech frame or to decode the encoded speech frame; A reconstruction scheduler which determines whether predetermined data can be inserted into the speech frame and transmits the speech frame to a baseband processor, or reconstructs the speech frame and transmits the speech frame to the baseband processor; And The voice frame analyzer extracts at least one of voice information and data from the voice frame according to whether the voice frame received from the baseband processor is inserted. Mobile terminal comprising a. The method of claim 15, The reconfiguration scheduler determines whether the data can be inserted using the voice activity and radio channel environment information. The method of claim 15, The reconfiguration scheduler retransmits the data when receiving a predetermined retransmission control signal indicating that there is an error in the previously transmitted data.

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