KR100848503B1 - Method, System and Mobile Communication Terminal for Providing Alternative Ring Back Tone Service by Changing Audio Codec - Google Patents

Abstract

The present invention relates to a method, a system and a mobile communication terminal for providing a ringback tone substitute sound service using an audio codec change.

The present invention includes the steps of (a) receiving a call and connecting the call path; (b) confirming whether or not a user is subscribed to a ringback tone replacement tone service; (c) confirming the sound source of the ringback tone substitute tone set for the called mobile communication terminal when the subscription of the ringback tone substitute tone service is confirmed as a result of step (b); (d) checking whether the sound source is an audio codec sound source encoded with an audio codec; (e) if the sound source is the audio codec sound source as a result of checking in step (d), controlling the calling mobile terminal to switch the basic codec to the audio codec; And (f) transmitting the audio codec sound source to the calling mobile communication terminal in bypass mode.

According to the present invention, in providing a ringback tone substitute sound service, it is possible to provide a high quality ringback tone substitute sound service by separately applying an audio codec and a voice codec.

Mobile communication, ringback tone, alternative sound, sound source, audio, voice, codec, bypass, quality

Description

Method for providing ring back tone alternative sound service using audio codec change, system and mobile communication terminal {Method, System and Mobile Communication Terminal for Providing Alternative Ring Back Tone Service by Changing Audio Codec}

1 is a block diagram schematically illustrating a ringback tone replacement sound service providing system using an audio codec change according to an embodiment of the present invention;

2 is a block diagram schematically illustrating an internal configuration of a mobile communication terminal providing a ringback tone substitute sound service using an audio codec change according to an embodiment of the present invention;

3 is a flowchart illustrating a ringback tone substitute sound service providing method using an audio codec change according to an embodiment of the present invention;

4A and 4B are exemplary views showing the first half and the second half of a detailed description of a ringback tone substitute sound service providing method using an audio codec change according to a preferred embodiment of the present invention;

5 is an exemplary diagram for explaining a signaling message according to a preferred embodiment of the present invention;

6A and 6B are exemplary diagrams illustrating a data format for identifying multiple audio codecs according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110: outgoing mobile communication terminal 112: incoming mobile communication terminal

120: mobile communication network 130: outgoing wireless base station

132: terminating base station 140: originating mobile communication switching center

142: terminating mobile communication switching center 150: common line signaling network

160: HLR 170: gateway

180: sound source providing unit 190: sound source providing unit

192: Internet 194: sound source control server

196: Subscriber DB 198: Web Server

210: memory 220: control unit

230: digital signal processor 232: audio codec

234: voice codec 240: baseband conversion unit

250: speaker 260: RF signal processing unit

270: antenna

The present invention relates to a method, a system and a mobile communication terminal for providing a ringback tone substitute sound service using an audio codec change. More specifically, in order to provide a ringback tone replacement sound service that provides real-time bitstreaming as a predetermined sound instead of a specific ring back tone (RBT), various audio codecs are applied to the type of service. When the sound source using the audio codec is set as the replacement sound to be adaptively applied according to the present invention, the mobile terminal transmits a signaling message to the mobile terminal to control the audio codec to be changed to the audio codec. When the communication terminal plays the sound source with the audio codec and terminates the ringback tone replacement sound service, it sends a signaling message to the mobile communication terminal to change the audio codec back to the voice codec so that the mobile communication terminal uses the voice codec. How, Systems, and Goes to Make Voice Calls It relates to the new terminal.

BACKGROUND With the rapid development of computer, electronic and communication technologies, various wireless communication services using wireless communication networks have been provided. The most basic wireless communication service is a voice call service that allows wireless communication between mobile subscribers using a mobile communication terminal regardless of time and place. In recent years, a wireless data service has emerged, which allows a mobile communication subscriber to perform data communication using a wireless communication network while the mobile subscriber is moving.

Accordingly, the mobile subscribers can freely move anywhere at any time by using the voice call service and make voice calls with the other party, as well as various information necessary for life using the wireless data service, for example, news, weather, sports, and securities. , Exchange rates, traffic information, etc. can be provided while moving in a variety of forms, such as text, voice, images.

Recently, a so-called ringback tone replacement sound service has been developed, which listens to the caller's mobile terminal that calls various kinds of music, voice, etc. designated by the called party or caller. have. This ringback tone replacement tone service is a service that provides a ringtone designated by the called party or the caller to the caller's mobile terminal, and is a modern voice instead of a simple sound such as "following", which is normally generated when a call is connected. It is a service that can be used as a substitute for ringback tone as well as the voice of the called party or caller, such as bird sound and water sound.

As the ringback tone replacement sound service is provided, the caller can feel auditory satisfaction by listening to the sounds of various sound sources instead of listening to a uniform mechanical ringback tone.

The ring back tone replacement tone service is typically provided to a mobile communication terminal in a mobile communication network implemented by a mobile communication system such as a code division multiple access (CDMA) 2000 system and a wideband CDMA (WCDMA) system.

In the mobile communication network, the enhanced variable rate codec (EVRC), which is generally referred to as "EVRC", is adaptive for providing the aforementioned ringback tone replacement sound service. A variable rate voice codec, such as an adaptive multi rate codec (AMR), hereinafter referred to as 'AMR', is used. The speech codec is designed for maximizing channel efficiency so as to detect a sounding section and a silent section, generate an appropriate codebook, and provide a voice service at a minimum bit rate through mapping.

However, voice codecs of variable bit rates such as EVRC and AMR apply the same logic to sound sources such as music with little silence section, and encode sound sources using the provided voice code book (Code Book). Incoding). On the other hand, if a sound source such as music is mapped to a voice codebook and encoded, the sound source is encoded according to a human voice pattern, thereby ignoring various patterns appearing in the music during encoding, and as a result, a coding error occurs. Degrades the quality. Therefore, the above-described variable code rate speech codec is not suitable for encoding sound sources in the form of audio such as music.

In order to solve the problem of the voice codec of variable bit rate, a sound source correction scheme has been developed and widely used. That is, a content provider (CP) that provides a sound source extracts a sound source from a high-quality music such as a compact disk (CD) and modifies and encodes the sound source to be suitable for a voice codec such as EVRC. Minimize damage to sound sources.

This method of sound source correction is dependent on the preprocessing processing considering the characteristics of the EVRC codec or the manual work of the sound engineer. However, these works can compensate for the quality of the ringback tone substitute sound service through the EVRC codec to the level of voice quality, but there is a limit to improving the quality of the ringback tone substitute sound service to high quality.

On the other hand, it is most effective to provide a ringback tone replacement sound by encoding an audio source and providing ringback tone replacement sound using an audio codec. However, there are some technical issues that must be preceded for this.

As a technical problem, first, an audio codec suitable for a voice channel of a mobile communication terminal should be modified and applied. That is, for example, 8 Kbps voice channel is used for the voice channel of the CDMA 2000 system, and 12.3 Kbp voice channel is used for the Global System for Mobile Communications (GSM) system. It should be able to provide ring back tone replacement service with improved quality by adjusting to the transmission speed.

Second, the service section is divided into ringback tone replacement sound service section and voice call section, and the audio codec is applied in ringback tone replacement sound service section, and the voice codec is applied in voice call section, and the sound source is transmitted to the mobile communication terminal. The terminal should be able to decode and play the sound source with the appropriate codec. Third, a sound source suitable for an audio codec applied in a mobile communication terminal and a mobile communication network should be produced and provided.

In summary, in order to provide a high quality ringback tone replacement sound service, it is essential to apply an audio codec and a voice codec by appropriately changing the sound codec in each section by dividing the ringback tone replacement sound service section and the voice call section. That is, it is necessary to provide a ringback tone replacement sound service by selecting a codec to be adaptively applied according to the type of service such as a ringback tone replacement sound service or a voice call service to a mobile communication network and a mobile communication terminal. However, until now, no technology has been developed to provide a ringback tone replacement service in this manner.

In order to solve this problem, the present invention provides a ringback tone replacement sound service that provides real-time bit streaming as a substitute sound for a predetermined specific sound instead of a conventional ring back tone (RBT). If a sound source using an audio codec is set as a substitute sound to be adaptively applied according to the type of service, the signaling message is transmitted to the mobile communication terminal to the audio codec. By changing the control, the mobile communication terminal plays the sound source with the audio codec, and when the ringback tone substitute sound service is terminated, a signaling message is sent to the mobile communication terminal to change the audio codec to the voice codec so that the mobile communication terminal can change the audio codec. You can use the voice codec to make a voice call. The purpose is to provide a method, a system and a mobile communication terminal.

In order to achieve the above object, the present invention provides a ringback tone substitute tone service to a calling mobile terminal requesting a call from a mobile communication network to a called mobile terminal, the method comprising: (a) requesting a call from a calling mobile terminal; Receiving and connecting a call; (b) confirming whether or not a user is subscribed to a ringback tone replacement tone service; (c) confirming the sound source of the ringback tone substitute tone set for the called mobile communication terminal when the subscription of the ringback tone substitute tone service is confirmed as a result of step (b); (d) checking whether the sound source is an audio codec sound source encoded with an audio codec; (e) if the sound source is the audio codec sound source as a result of checking in step (d), controlling the calling mobile terminal to switch the basic codec to the audio codec; And (f) transmitting the audio codec sound source to a calling mobile communication terminal in a bypass mode without passing through a vocoder. to provide.

In addition, according to another object of the present invention, the calling mobile communication terminal for requesting a voice call, the incoming mobile communication terminal for receiving a voice call and a sound source providing unit for providing a sound source of the ringback tone replacement sound, and the outgoing mobile communication terminal In a system for providing a ringback tone replacement service, receiving a voice call from an outgoing mobile communication terminal, establishing a call path with the outgoing mobile terminal, and confirming whether the incoming mobile communication terminal is subscribed to the ringback tone replacement sound service. And analyzes the sound source of the ringback tone substitute sound set for the incoming mobile terminal, checks whether it is an audio codec encoded with an audio codec, and controls the calling mobile terminal to switch the default codec to an audio codec. Includes mobile communication network for transmitting codec sound source to calling mobile communication terminal Provided is a ringback tone replacement sound service providing system using an audio codec change.

According to yet another object of the present invention, a mobile communication terminal is provided with a mobile communication service and a ringback tone replacement sound service from a mobile communication network and requests a voice call to a receiving mobile communication terminal which is requested for a voice call using the mobile communication network. An antenna comprising: an antenna for receiving and transmitting a signaling message from the mobile communication network as an RF signal; An RF signal processor for demodulating the RF signal and transmitting a demodulated signal; A baseband converter configured to receive a demodulated signal from an RF signal processor and convert the demodulated signal into a baseband signal, and process the analog-to-digital conversion of the baseband signal to transmit a digital signal; A digital signal processor including one or more of a voice codec and an audio codec implemented by one or more of software and hardware, and setting and converting one of the voice codec and the audio codec to a basic codec; A memory unit for storing a codec changing program for setting one of a voice codec and an audio codec as a default codec; And receiving the digital signal from the baseband converter to identify the signaling message, and when changing the default codec, executes a codec changing program to control the digital signal processor to set one of the voice codec and the audio codec as the default codec. Provided is a mobile communication terminal providing a ringback tone substitute sound service using an audio codec change, comprising a control unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In the following description of the present invention, a preferred embodiment of the present invention will be described assuming that a mobile communication system implementing a mobile communication network is a code division multiple access (CDMA) 2000 system. However, this assumption is for convenience of description, and the technical idea of the present invention is not limited to this assumption and may be applied to other synchronous mobile communication systems and other asynchronous systems.

That is, in providing a ringback tone substitute sound instead of the conventional ringback tone to the wireless terminal in the wireless network, the wireless terminal changes the codec for the sound source of the ringback tone substitute sound to a voice codec or an audio codec in the wireless network. If it is controlled so as to provide a sound source according to it will be within the scope of the technical idea of the present invention.

1 is a block diagram schematically illustrating a ringback tone substitute sound service providing system using an audio codec change according to an exemplary embodiment of the present invention.

Ring back tone replacement sound service providing system using an audio codec change in accordance with a preferred embodiment of the present invention, the outgoing mobile communication terminal 110, the destination mobile communication terminal 112, the mobile communication network 120 and the sound source providing unit 190 It is configured to include.

The outgoing mobile terminal 110 and the terminating mobile communication terminal 112 use a mobile communication network 120 to perform voice calls with each mobile communication terminal or with a general landline telephone through a public switched telephone network (not shown). Communication terminal. Here, the mobile communication terminal is a PDA (Personal Digital Assistant), cellular phone, PCS (Personal Communication Service) phone, Hand-Held PC (GSM), Global System for Mobile (GSM) phone, Wideband CDMA (WCDMA) phone, CDMA-2000 phone, Mobile Broadband System (MBS) phone and the like. Here, MBS phone refers to a mobile phone to be used in the fourth generation system currently being discussed.

According to a preferred embodiment of the present invention, the outgoing mobile terminal 110 requests a voice call to the called party's mobile terminal 112 using the mobile communication network 120 according to a caller's key manipulation, and the called party rings the ringback tone. In the case of subscribing to the substitute tone service, that is, in the case of subscribing to the ringback tone substitute tone service for the incoming mobile communication terminal 112, the mobile communication terminal receives and outputs the ringback tone substitute tone from the mobile communication network 120.

In addition, the outgoing mobile communication terminal 110 according to the preferred embodiment of the present invention requests a voice call to the incoming mobile communication terminal 112 using the mobile communication network 120 and then replaces the ringback tone from the mobile communication network 120. In receiving, when the sound source of the ringback tone substitute sound is encoded with the audio codec, when receiving a data burst message (DBM) as a signaling message requesting to change to the audio codec, the default codec is replaced with the audio codec. In this case, the audio source received from the mobile communication network 120 is decoded and reproduced by an audio codec.

In addition, when the outgoing mobile communication terminal 110 according to the preferred embodiment of the present invention receives a data burst message as a signaling message requesting to change the voice codec from the mobile communication network 120, the default codec is changed to the voice codec and changed. Make a voice call with the voice codec. The outgoing mobile communication terminal 110 according to the preferred embodiment of the present invention will be described in detail with reference to FIG. 2.

Incoming mobile communication terminal 112 according to a preferred embodiment of the present invention is a mobile communication terminal that receives a call request from the outgoing mobile communication terminal 110 using the mobile communication network 120, the paging request of the mobile communication network 120 Respond accordingly.

The mobile communication network 120 according to the preferred embodiment of the present invention includes an outgoing radio base station 130, an incoming radio base station 132, an outgoing mobile communication exchange station 140, a destination mobile communication exchange station 142, and a common line signaling network (CCSN). : Common Channel Signaling Network (150), home location register (HLR: Home Location Register, hereinafter referred to as 'HLR', 160), including the gateway 170 and the sound source providing device 180, the outgoing mobile communication terminal 110 And a communication network for providing a voice call service and a ringback tone replacement sound service to the called mobile communication terminal 112.

Here, the source radio base station 130 and the destination radio base station 132 are each a radio base station of a mobile communication network 120 including a base station transmission system (BTS) and a base station controller (BSC).

When the outgoing wireless base station 130 according to the preferred embodiment of the present invention receives a call request from the outgoing mobile communication terminal 110, it connects a call path between the outgoing mobile communication terminal 110 and the outgoing mobile communication switching center 140. When receiving the bypass setting message, which is a Transcoder control request message to switch to the bypass mode from the outgoing mobile communication switching center 140, the mobile station switches to the bypass mode and receives from the outgoing mobile switching center 140. The audio codec sound source is relayed to the outgoing mobile communication terminal 110 without being passed through the vocoder.

In addition, the originating radio base station 130 according to the preferred embodiment of the present invention releases the bypass mode when receiving a bypass release message, which is a transcoder control request message to release the bypass mode from the originating mobile communication switching center 140. The voice call for the voice call is vocoded using a vocoder and relayed to the calling mobile terminal 110.

The outgoing mobile communication switching center 140 and the incoming mobile communication switching center 142 perform basic and additional service processing, incoming and outgoing call processing of subscribers, location registration procedure and handoff procedure processing, interworking functions with other networks, and the like. As the mobile communication switching station of 120, each of the calling mobile terminal 110, the calling party, the called party, the information of the called party, and the location of each mobile communication terminal using the HLR 160, respectively. Identify information and status information.

When the outgoing mobile communication switching center 140 according to the preferred embodiment of the present invention receives a call call requesting a voice call from the outgoing mobile communication terminal 110 and the outgoing mobile communication terminal 110 is connected to a call path, the incoming call is transferred. When the ISUP call is established with the communication switching station 142 and the information on the ringback tone replacement sound, the information on the bypass mode, and the control information are received from the sound source providing apparatus 180, the ringback tone replacement sound is generated using the audio codec. It checks whether the encoded sound source, that is, the audio codec sound source, controls to switch the outgoing wireless base station 130 to the bypass mode.

In addition, the outgoing mobile communication switching center 140 according to the preferred embodiment of the present invention controls to switch the outgoing wireless base station 130 to the bypass mode, and then sends a signaling message through the outgoing wireless base station 130 to send outgoing mobile communication. The terminal 110 controls the audio codec to change the default codec, and transmits the audio codec sound source from the sound source providing apparatus 180 to the calling mobile communication terminal 110.

In addition, when the originating mobile communication switching center 140 according to the preferred embodiment of the present invention is notified of the response of the terminating mobile communication terminal 112 from the terminating mobile communication switching center 140, it causes the calling wireless base station 130 to bypass. Control to release the mode, and control the originating mobile communication terminal 110 to switch the basic codec to the voice codec, and reporting the response of the terminating mobile communication terminal 112 as alert information (Alert Information). Notify 110 to perform a voice call between the calling mobile communication terminal 110 and the destination mobile communication terminal 112.

When the incoming mobile communication switching center 142 according to the preferred embodiment of the present invention is informed by the calling mobile communication switching station 140 that there is a voice call request for the incoming mobile communication terminal 112, Perform ISUP call setup, paging the terminating mobile communication terminal 112, check whether the terminating mobile communication terminal 112 is subscribed to the ringback tone replacement sound service using the HLR 160, and then provide a sound source The device 180 performs ISUP call setup and transmits the audio codec sound source received from the sound source providing apparatus 180 to the calling mobile communication switching center 140.

In addition, when there is a response from the terminating mobile communication terminal 112, the terminating mobile communication switching station 142 according to an embodiment of the present invention notifies the calling mobile communication switching station 140, from the sound source providing device 180 The audio codec sound source transmitted to the outgoing mobile communication switching center 140 is relayed, and a voice call between the outgoing mobile communication terminal 110 and the destination mobile communication terminal 112 is relayed.

The common line signal network 150 refers to a network that is composed of signal points and signal links and provides a common line signaling system standardized in the ITU-T No. 7 scheme. Here, the common line signaling scheme refers to a signaling scheme that separates signal information and network management information into voice and data and transmits them on a separate channel commonly used for signal transmission.

The HLR 160 is a database that stores service profiles related to subscriber information of mobile subscribers. The HLR 160 performs a function such as registration recognition, registration deletion, and location checking of each mobile communication terminal, and uses each mobile communication terminal. Device for providing information and sound source such as a mobile subscriber's telephone number, a mobile identification number (MIN), an electronic serial number (ESN), a ringback tone replacement tone service, etc. Stores information for routing.

The gateway 170 is a device that interconnects a plurality of different types or same types of communication networks to exchange information with each other. The gateway 170 converts protocols by interconnecting a plurality of incompatible networks or devices with different protocols. Relay information to send and receive information between

The sound source providing device 180 is an IP for an intelligent network that stores a ringback tone replacement sound source. When the ringback tone replacement sound source is received, the sound source providing device 180 requests a sound source authentication to the sound source providing control server 194, and the authentication of the sound source is successful. A ringback tone substitute sound source is transmitted to the switching center 142. In addition, the sound source providing apparatus 180 stores and manages a ringback tone replacement sound source when the ringback tone replacement sound source is transmitted from the web server 198.

The sound source providing apparatus 180 according to the preferred embodiment of the present invention performs an ISUP call setup with the incoming mobile communication switching center 142, and then checks the ringback tone replacement sound source set for the incoming mobile communication terminal 112 and rings After generating the information on the backtone substitute tone, the information on the bypass mode, and the control information, it transmits to the calling mobile communication switching center 140 and transmits the audio codec sound source to the called mobile communication switching center 142.

Here, the sound source providing apparatus 180 according to the preferred embodiment of the present invention is to determine whether the ringback tone replacement sound source set for the terminating mobile communication terminal 112 is an audio codec sound source encoded with an audio codec, In this case, information on a ringback tone replacement sound, information on a bypass mode, control information, and the like are generated.

The sound source providing unit 190 generates and receives a ringback tone replacement sound source including the Internet 192, a sound source providing control server 194, a subscriber DB 196, and a web server 198 to an audio codec or a voice codec. The encoding is provided to the sound source providing apparatus 180.

The Internet 192 is a service that exists in the TCP / IP protocol and its upper layers: Hypertext Transfer Protocol (HTTP), Telnet, File Transfer Protocol (FTP), Domain Name System (DNS), and Simple Mail Transfer Protocol (SMTP). , A global open computer network architecture that provides the Simple Network Management Protocol (SNTP), Network File Service (NFS) and Network Information Service (NIS).

The sound source providing control server 194 is a server controlling the provision of the ringback tone replacement sound service, and controls the sound source providing apparatus 180 and the subscriber database (DB), and the incoming mobile communication terminal 110 and the incoming mobile communication. Sound source authentication is performed using information on the caller and the called party of the terminal 112, information on the call request time, and the like.

The subscriber DB 196 is a database that stores and manages information of subscribers subscribed to the ringback tone replacement tone service, and provides subscriber information necessary to perform sound source authentication in the sound source providing control server 194.

The web server 198 is connected to the sound source providing device 180 and the sound source providing control server 194 through the Internet 192 to add a ringback tone replacement sound to the sound source providing device 180, and the sound source providing control server ( 194), a user interface for setting and changing a sound source code corresponding to information on a sound source specification, that is, information on a caller, a group of callers, a calling time, and a sound source specification, to a user terminal such as a computer or a mobile communication terminal. to provide. To this end, the web server 198 provides a web page or a swap page to a user terminal or a mobile communication terminal.

2 is a block diagram schematically illustrating an internal configuration of a mobile communication terminal providing a ringback tone substitute sound service using an audio codec change according to a preferred embodiment of the present invention.

A mobile communication terminal providing a ringback tone replacement sound service using an audio codec change according to a preferred embodiment of the present invention is implemented as an outgoing mobile communication terminal 110 in FIG. 1, and includes a memory unit 210, a controller 220, and a digital signal. Audio using a audio codec including a DSP (Digital Signaling Digital Signal Processor, 230), a baseband converter 240, a speaker 250, an RF (Radio Frequency) signal processor 260 and an antenna 270 Codec A mobile communication terminal for decoding and reproducing a sound source. Hereinafter referred to as outgoing mobile communication terminal 110 to unify in the term mentioned in FIG.

The memory unit 210 drives the outgoing mobile terminal 110 and performs voice and data communication, and performs a plurality of applications performing various additional functions, protocol software for processing messages transmitted and received with the mobile communication network 120, and the like. Save it. To this end, the memory unit 210 may electrically modify the contents in units of EEPROM (Block) or blocks in which the contents may be modified in units of bytes, which are nonvolatile memories. ) And SDRAM (Synchronous Dynamic Random Access Memory).

The memory unit 210 according to an exemplary embodiment of the present invention mutually uses a voice codec and an audio codec as a basic codec under the control of the mobile communication network 120 from the mobile communication network 120, that is, the control of the originating mobile communication switching center 140. Stores a codec changer, which is software for changing the liver.

The controller 220 controls the overall operation of the outgoing mobile terminal 110. In addition, the controller 220 executes various applications stored in the memory 210 to perform additional functions as well as a function for performing voice and data communication.

When the control unit 220 according to the preferred embodiment of the present invention receives a codec change request from the mobile communication network 120, the control unit 220 executes a codec changing program to switch the audio codec and the voice codec of the digital signal processor 230 as the basic codec. . That is, the controller 220 analyzes the signaling message received from the mobile communication network 120, checks whether a codec or audio codec is requested to change the default codec, and then causes the digital signal processor 230 to execute the corresponding codec. To change to the default codec.

The digital signal processor 230 is a digital signal processor that codes or decodes a voice signal, performs an equalizer function to remove multipath noise, and performs an acoustic data processing function. In addition, the digital signal processor 230 exchanges voice data with the baseband converter 240 and receives digital data from the baseband converter 240.

The preferred digital signal processor 230 of the present invention has an audio codec and a voice codec implemented in software or an audio codec and a voice codec implemented in hardware to decode a voice or a sound source with a codec set as a basic codec. That is, the digital signal processor 230 includes both an audio codec and a voice codec, sets a specific codec as a default codec under the control of the controller 220, and decodes and transmits a voice or a sound source as the default codec.

Therefore, the digital signal processor 230 according to an exemplary embodiment of the present invention can decode the voice into a high quality voice or sound source, that is, ringback tone replacement sound, by decoding the voice with the voice codec and the audio source with the audio codec.

The baseband converter 240 converts a signal transmitted / received between the RF signal processor 260, the digital signal processor 230, and the speaker 250 into a baseband signal, and performs digital-to-analog conversion and analog-digital conversion processing. And so on.

The speaker 250 outputs an audio signal output from the baseband converter 240 as an audible sound. The RF signal processor 260 controls the power of the transmission signal received from the baseband converter 240 or the gain thereof, demodulates and amplifies the RF signal received from the antenna 270, and performs a baseband converter ( The transmission signal received from 240 is modulated and transmitted to the antenna 270. Antenna 270 transmits and receives wireless signals from or into the air.

3 is a flowchart illustrating a ringback tone replacement sound service providing method using an audio codec change according to an exemplary embodiment of the present invention.

When a caller inputs a phone number of the called mobile communication terminal 112 by operating a key of the calling mobile communication terminal 110 to perform a voice call with the called party, and selects a call button, the calling mobile communication terminal 110 Request a call to the mobile communication network (120). That is, the mobile communication network 120 receives a call call from the outgoing mobile communication terminal 110 and connects the outgoing mobile communication terminal 110 with a call path (S310).

The mobile communication network 120 connecting the calling mobile communication terminal 110 with the call path checks the service subscription information for the incoming mobile communication terminal 112 (S320) and the incoming mobile communication terminal 112 provides the ringback tone replacement sound service. Check whether the subscription (S330).

If the incoming mobile communication terminal 112 does not subscribe to the ringback tone replacement service as a result of checking in step S330, the mobile communication network 120 provides the ringback tone to the calling mobile communication terminal 110 in a normal procedure (S332). ). Since the procedure for providing a conventional ringback tone is a well known technique, detailed description thereof will be omitted.

In addition, the mobile communication network 120 checks the type of the ringback tone replacement sound set for the incoming mobile communication terminal 110 when the incoming mobile communication terminal 112 subscribes to the ringback tone replacement sound service as a result of checking in step S330. In operation S350, it is determined whether the ringback tone substitute sound set for the incoming mobile communication terminal 110 is an audio codec sound source encoded using the audio codec (S350).

If the ringback tone replacement sound is a normal ringback tone replacement sound source encoded by a voice codec instead of an audio codec as a result of checking in step S350, the mobile communication network 120 sends a ringback tone replacement sound service according to a conventional procedure. Provided to 110 (S352).

In addition, the mobile communication network causes the wireless base station, that is, the originating wireless base station 130, to bypass when the ringback tone replacement sound is an audio codec sound source other than a normal sound source encoded with a voice codec instead of an audio codec as a result of checking in step S350. Control to switch to the mode, and transmits a predetermined signaling message to the outgoing mobile terminal 110 to control the outgoing mobile terminal 110 to switch the default codec to an audio codec (S360).

The mobile communication network 120 that controls the outgoing mobile terminal 110 transmits the audio codec sound source to the outgoing mobile terminal 110 by bypass without vocoding at the outgoing wireless base station 130 (S370). The outgoing mobile terminal 110 decodes the received audio codec sound source using the audio codec set as the default codec in step S360 to reproduce a high quality sound source as ring back tone replacement sound.

Meanwhile, after transmitting the audio codec sound source to the calling mobile terminal 110 in step S370, the mobile communication network 120 checks whether there is a response to paging from the called mobile terminal 112 (S380).

If there is no response to paging from the destination mobile communication terminal 112, the mobile communication network 120 continues to stream the audio codec sound source to the outgoing mobile communication terminal 110 until there is a response. In case that there is a response to paging from the destination mobile communication terminal 112, a predetermined signaling message is transmitted to the calling mobile communication terminal 110, and the calling mobile communication terminal 110 converts the basic codec into a voice codec. Control to switch (S390).

The mobile communication network 120 that controls the outgoing mobile terminal 110 transmits an alert message indicating that the incoming mobile communication terminal 112 has responded to the outgoing mobile communication terminal 110 to move the incoming mobile communication terminal 110 with the incoming mobile communication terminal 110. It is possible to perform a voice call between the communication terminal 120 (S392).

In this case, since the originating mobile communication terminal 110 converts the basic codec into the voice codec in step S390, it is possible to appropriately decode and reproduce the voice received from the incoming mobile communication terminal 112.

4A and 4B are exemplary views showing the first half and the second half of a detailed description of a method for providing a ringback tone substitute sound service using an audio codec change according to a preferred embodiment of the present invention.

3 illustrates a method for providing a ringback tone replacement sound service using an audio codec change according to a preferred embodiment of the present invention centering on the outgoing mobile terminal 110 and the mobile communication network 120. Hereinafter, in order to describe the preferred embodiment of the present invention in detail, the relationship between the respective components in the mobile communication network 120, the outgoing mobile communication terminal 110, and the incoming mobile communication terminal 112 and their respective roles will be described in detail. .

4A and 4B, it should be clearly understood that the mobile communication system constituting the mobile communication network 120 is assumed to be a CDMA 2000 system for convenience of explanation, as described above. Therefore, in other mobile communication systems, terms and functions of the following description will be somewhat different.

The calling mobile communication terminal 110 requests a call while transmitting information on the called mobile communication terminal 110, that is, a telephone number, etc., to the calling wireless base station 130 according to the caller's key manipulation (S402). The outgoing wireless base station 130 that has received the call request requests the setting of the call path to the outgoing mobile communication switching center 140 (S404), and the outgoing mobile communication switching center 140 sends the calling path to the outgoing wireless base station 130. A request is made to allocate to the mobile communication terminal 110 (S406).

The outgoing wireless base station 130 connects with the outgoing mobile communication terminal 110 in a call (S408), and the outgoing mobile communication terminal 110 notifies the outgoing wireless base station 130 that the call path is connected and confirms it (S410). The originating radio base station 130 notifies the originating mobile communication switching center 140 that the assignment to the call is completed (S412).

When the outgoing mobile communication exchange station 140 confirms that the outgoing mobile communication terminal 110 and the call path are connected through the outgoing wireless base station 130, the area where the incoming mobile communication terminal 110 is located by using the HLR 160. Recognizing the incoming mobile telecommunication switching center 142, which is the mobile telecommunication switching center, sets an ISUP call with the incoming mobile telecommunication switching station 142 (S414).

The terminating mobile communication switching station 142, which has set up an ISUP call with the outgoing mobile communication switching station 140, calls, that is, paging the receiving mobile communication terminal 112 using the terminating wireless base station 122 (S416), and the HLR 160. Check whether or not the incoming mobile communication terminal 112 is subscribed to the ringback tone replacement sound service using the (S418).

The destination mobile communication switching center 142 provides a typical ringback tone to the calling mobile communication terminal 110 through the calling mobile communication switching center 140 when it is not subscribed to the ringback tone replacement sound service as a result of checking in step S418 ( S420), if the subscription to the ringback tone replacement service is set, the sound source providing apparatus 180 and the ISUP call are set (S422).

The sound source providing device 180 that sets up the ISUP call with the incoming mobile communication switching center 142 checks the sound source of the ringback tone replacement sound set for the incoming mobile communication terminal 112, and the information about the ringback tone replacement sound and the ringback tone When the substitute sound source is an audio codec sound source encoded using the audio codec, an ISUP_CPG message including information about the bypass mode and control information is transmitted to the source mobile communication switching center 140 (S424).

Receiving the ISUP_CPG message, the outgoing mobile telecommunication switching center 140 analyzes the ISUP_CPG and checks whether the ringback tone replacement sound source is an audio codec sound source encoded using the audio codec (S426).

The originating mobile telecommunication switching center 140 provides the ringback tone replacement sound service according to the normal procedure when the audio codec is not the audio codec as a result of checking in step S426 (S428), and the calling mobile base station 130 when the audio codec is the audio codec. Bypass setting message, Transcoder Control Request message requesting to switch to bypass mode, and the originating radio base station 130, the bypass does not operate the vocoder upon receiving the transcode control request message After switching to the mode, a bypass setting confirmation message, which is a Transcoder Control Acknowledge message indicating that the switching is completed, is transmitted to the calling mobile communication switching center 140 (S430).

In addition, the outgoing mobile communication switching center 140 that controls the outgoing wireless base station 130 as shown in step S430, the TI (to the calling mobile communication terminal 110) to convert the basic codec of the outgoing mobile communication terminal 110 into an audio codec. Teleservice Identifier) transmits a data burst message with a 61888 as a signaling message (S432).

Receiving a data burst message with a TI of 61888, the originating mobile communication terminal 110 checks that the TI value of the data burst message, that is, 61888, confirms that it is requested to switch to the audio codec, and responds to the data burst message with the TI. A Data Burst Ack Message of 61889 is transmitted as a signaling message to the calling mobile communication switching center 140 through the calling radio base station 130 (S434). This message is a non-reprocessable message, and the originating mobile switching center 140 receiving the message does not perform any other operation.

The originating mobile communication terminal 110, which transmits a data burst confirmation message having a TI of 61889, switches the basic codec to an audio codec (S436).

After converting the basic codec of the outgoing mobile terminal 110 into an audio codec, the audio codec sound source is transmitted to the outgoing mobile terminal 110. That is, the sound source providing apparatus 180 transmits the audio codec sound source set as the ringback tone replacement sound of the terminating mobile communication terminal 110 to the terminating mobile communication switching center 142, and the terminating mobile communication switching center 142 transmits the audio codec sound source. It relays to the outgoing mobile communication switching center 140, and the outgoing mobile communication switching center 140 transmits to the outgoing mobile communication terminal 110 through the outgoing wireless base station 130 (S438).

The originating mobile communication terminal 110 receiving the audio codec sound source decodes the audio codec sound source with the audio codec set as the default codec to reproduce the ringback tone replacement sound (S440). In this case, it is preferable that the originating mobile communication terminal 110 selects or changes the applied codec by searching the bit stream of the received audio codec sound source. That is, if the data burst message received by the originating mobile communication terminal 110 from the originating mobile communication switching station 140 has an error, or if the codec is not changed normally, for example, when it is different from the codec provided by the designated codec, In preparation, it is desirable to search the received audio codec sound source and change the default codec to an appropriate audio codec.

Thus, the mobile communication network 120 may provide an audio codec sound source encoded with an audio codec to the calling mobile communication terminal 110, and the calling mobile communication terminal 110 may play an audio codec sound source using the audio codec. Therefore, the quality of the ringback tone replacement sound service can be improved.

On the other hand, while the outgoing mobile terminal 110 reproduces the ringback tone replacement tone, the incoming mobile terminal 112 may respond to the call request of the outgoing mobile terminal 110, that is, the paging of the incoming mobile switching center 142. Can be. In this case, the mobile communication network 120 should perform a voice call between the calling mobile communication terminal 110 and the called mobile communication terminal 112. Hereinafter, by controlling the outgoing mobile terminal 110 converting the basic codec to the audio codec to the voice codec, the outgoing mobile terminal 110 may perform a voice call with the incoming mobile terminal 112 and the voice codec. Explain how to do this.

When the called mobile communication terminal 112 receives a paging request from the called mobile communication switching center 142 in step S414, the called party notifies the called party of a ring, vibration, etc., and the called party confirms this and presses a specific key or opens a folder. As a specific action, the incoming mobile communication terminal 112 is operated to express the intention to receive the call. At this time, the terminating mobile communication terminal 112 responds to paging of the terminating mobile communication switching center 142 (S442).

Receiving a response to paging, the terminating mobile telecommunication switching center 142 transmits an ISP_ANM message notifying that the terminating mobile communication terminal 112 has responded to the calling mobile telecommunication switching center 140 (S444), and no longer ringback tone replacement tone That is, since the audio codec does not need to be provided to the calling mobile communication terminal 110, the ISUP call with the sound source providing apparatus 180 is released (S446).

The originating mobile telecommunication switching center 140 receiving the ISUP_ANM message in step S444 releases the bypass, which is a transcoder control message requesting the release of the bypass mode to the originating radio base station 130 in order to release the bypass mode requested in step S430. The message is transmitted (S448). The outgoing wireless base station 130 releases the bypass mode and vocodes the voice to be transmitted to the outgoing mobile communication terminal 110 by vocoding the voice.

The outgoing mobile switching center 140, which requests the outgoing wireless base station 130 to release the bypass mode, sends a data burst message having a TI of 61890 as a signaling message to switch the default codec of the outgoing mobile terminal 110 as a signaling message. S130 transmits to the outgoing mobile communication terminal 110 through (130).

Receiving the data burst message, the calling mobile terminal 110 confirms the request to switch the default codec to the voice codec by checking the value of TI, and in response, sends a data burst acknowledgment message of TI 61891 as a signaling message. It transmits to the outgoing mobile communication terminal 140 through the wireless base station 130 (S452).

The calling mobile communication switching center 140 transmits alert information indicating that the called mobile communication terminal 112 has responded to the calling mobile communication terminal 110 through the calling wireless base station 130 (S454).

The outgoing mobile communication terminal 110 receiving the alert information switches the basic codec to the voice codec (S456), and performs a voice call with the incoming mobile communication terminal 112 using the voice codec (S458). At this time, the outgoing wireless base station 130 vocodes and transmits the voice to the voice codec switched in step S448, and the outgoing mobile communication terminal 110 reproduces the voice with the voice codec, thereby replacing the ringback tone encoded by the audio codec. That is, the audio codec sound source can be decoded and reproduced by the audio codec, and the voice can be decoded and reproduced by the voice codec. Therefore, it is possible to provide a high quality ringback tone replacement sound service by separately delivering and reproducing voice and audio into a voice codec and an audio codec, respectively.

5 is an exemplary diagram for describing a signaling message according to a preferred embodiment of the present invention.

5A shows the message format of a data burst message. The outgoing mobile switching center 140 controls the outgoing mobile communication terminal 110 to change the default codec by sending a data burst message as a signaling message by designating a codec as a value of TI, and the data burst message is shown in 5A. As shown.

The message format of the data burst message includes a TI field, a Mobile Identification Number (MIN) field, and an applied codec information field as shown. The TI field is a field having a predefined value between the outgoing mobile communication switching center 140 and the outgoing mobile communication terminal 110. The outgoing mobile communication switching station 140 starts and ends the ring back tone replacement tone service interval. This is a field for notifying the terminal 110. The TI value can be changed as needed. That is, although four values such as 61888, 61889, 61890, and 61891 are used as TI values of the data burst message in FIG. 4, this is an exemplary value that may be changed as necessary.

The MIN field is a field indicating the MIN of the outgoing mobile terminal 110 or the incoming mobile terminal 112.

The last field of the data burst message, that is, the applied codec information field, indicates information on the type of codec to be applied by the calling mobile terminal 110. That is, information on the type of codec to be set as a basic codec among various codecs provided by the calling mobile communication terminal 110 is shown. Codec types and field values are explained in 5B.

The Applicable Codec Information field is not necessary to specify the Applicable Codec in the data burst message. That is, the application codec information may be represented using the TI value of the TI field. If the TI value is set differently according to the applied codec information and promised to use it in advance between the calling mobile terminal 110 and the calling mobile switching center 140, the applied codec information field is a reserved field. You can specify the codec to apply.

5B shows the type of codec that can be applied according to the value of the applied codec information field. The originating mobile communication terminal 110 checks the field value of the applied codec information field and checks the applied codec corresponding thereto and sets the checked codec as the default codec.

6A and 6B are exemplary diagrams illustrating a data format for identifying multiple audio codecs according to a preferred embodiment of the present invention.

As described above in step S440 of FIG. 4, the outgoing mobile communication terminal 110 selects or changes to an audio codec suitable for decoding the audio codec sound source by analyzing the received ringback tone replacement sound source, that is, the audio codec sound source of the bit stream. It is desirable to.

Therefore, in order for the originating mobile communication terminal 110 to analyze or select an appropriate audio codec by analyzing the audio codec sound source, the corresponding information should be specified in the audio codec sound source. That is, when the sound source providing apparatus 180 generates a sound source encoded with an audio codec, that is, an audio codec sound source, the sound source providing apparatus 180 must encode information about an audio codec suitable for the audio codec sound source.

6A shows the data format of a sound source encoded with a conventional audio codec, that is, an audio codec sound source. A typical audio codec sound source has a 168-bit (21-byte) audio data bit stream field and a 3-bit dummy field of a total of 171 bits.

6B shows a data format of an audio codec sound source according to a preferred embodiment of the present invention. In the present invention, in order to indicate information about an audio codec suitable for an audio codec sound source, information about the audio codec, that is, audio codec identification information, is specified in a 3-bit dummy field not used in the conventional format described above in 6A.

6C exemplarily shows audio codec identification information. Since the dummy field is composed of 3 bits, it may represent eight audio codec identification information.

The originating mobile communication terminal 110 checks the dummy field to identify, select, and change an audio codec suitable for the corresponding audio codec sound source. Therefore, even when there is an error in the data burst message generated by the outgoing mobile terminal 110 or an appropriate audio codec is not specified for other reasons, the outgoing mobile terminal 110 selects an appropriate audio codec and converts it to the default codec. can do.

Although only audio codec identification information, which is information for identifying an audio codec, has been described herein, voice codec identification information, which is information for identifying a voice codec, may also be designated using a dummy field as described with reference to FIG. 6.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, in providing a ringback tone replacement sound service, a high quality ringback tone replacement sound service can be provided by separately applying an audio codec and a voice codec.

Further, by transmitting a signaling message from the mobile communication network to the mobile communication terminal, it is possible to stably provide a ringback tone replacement sound service by controlling the mobile communication terminal to apply various audio codecs.

In addition, even when a signaling message has an error or an appropriate audio codec is not specified for other reasons, the mobile communication terminal can select and change the appropriate audio codec on its own to provide a stable service.

Claims (23)

A method for providing a ringback tone replacement sound service to a calling mobile terminal requesting a call from a mobile communication network to an incoming mobile terminal, (a) receiving the call from the calling mobile terminal and connecting a call path; (b) confirming whether or not the user is subscribed to the ringback tone replacement tone service; (c) confirming the sound source of the ringback tone substitute sound set for the called mobile communication terminal when the ringback tone substitute tone service is subscribed as a result of the checking in step (b); (d) checking whether the sound source is an audio codec sound source encoded with an audio codec; (d1) if the sound source is a sound source encoded with a voice codec other than the audio codec sound source as a result of the checking in step (d), transmitting a sound source encoded with the voice codec to the calling mobile communication terminal; (e) if the sound source is an audio codec sound source as a result of checking in step (d), controlling the outgoing mobile communication terminal to switch the default codec to the audio codec; And (f) transmitting the audio codec sound source to the calling mobile communication terminal in bypass mode without passing through a vocoder; Ringback tone replacement sound service providing method using an audio codec change characterized in that it comprises a. The method of claim 1, wherein the method is After step (c), (c1) if the ringback tone is not subscribed to the ringback tone replacement service as a result of the checking in step (b), transmitting a ringback tone to the calling mobile terminal; Ringback tone replacement sound service providing method using an audio codec change characterized in that it further comprises. delete The method of claim 1, wherein the method is After the step (f), (g) paging the called mobile communication terminal; (h) receiving a response to paging from the called mobile communication terminal; (i) controlling the originating mobile communication terminal to convert the basic codec into a voice codec; And (j) controlling to make the call between the calling mobile terminal and the called mobile terminal; Ringback tone replacement sound service providing method using an audio codec change characterized in that it further comprises. The method of claim 1, wherein in step (e), And the mobile communication network controls to switch the basic codec by transmitting a signaling message to the calling mobile communication terminal. The method of claim 5, wherein the signaling message, If the mobile communication network is a synchronous scheme, a method for providing a ringback tone replacement sound using an audio codec change, characterized in that it is a data burst message. The method of claim 6, wherein the data burst message, It includes a Teleservice Identifier (TI) field, a Mobile Identification Number (MIN) field, and an application codec information field, wherein the TI field is a field for specifying values of TI indicating the start and end of the interval of the ringback tone replacement tone service, The MIN field is a field indicating at least one MIN of the calling mobile terminal and the called mobile communication terminal, and the applied codec information field is a field indicating a type of codec to be applied as the basic codec. Ringback tone replacement sound service providing method using the change. The method of claim 6, wherein the data burst message, And a Teleservice Identifier (TI) field and a Mobile Identification Number (MIN) field, wherein the TI field specifies a plurality of values representing the start and end of a section of the ringback tone replacement tone service, and corresponds to the plurality of values. And a field indicating a type of codec to be applied as the basic codec. The method of claim 1, wherein after step (f): (k) analyzing the audio codec sound source in the outgoing mobile communication terminal and comparing the audio codec encoding the audio codec sound source with the audio codec set as the default codec to determine whether there is a match; And (l) If it does not match, as a result of checking in step (k), the source mobile communication terminal analyzes data of the audio codec sound source and sets the audio codec encoding the audio codec sound source as the default codec. Steps to play codec sound source Ringback tone replacement sound service providing method using an audio codec change characterized in that it further comprises. An outgoing mobile terminal for requesting a voice call, an incoming mobile communication terminal for receiving the voice call, and a sound source providing unit for providing a sound source for a ringback tone substitute sound, and providing a ringback tone substitute sound service to the outgoing mobile terminal. In the system, The voice call is received from the originating mobile communication terminal to establish a call path with the originating mobile communication terminal, check whether or not the incoming mobile communication terminal is subscribed to a ringback tone replacement tone service, and call the mobile communication terminal. Analyzes the sound source of the ringback tone replacement sound set for the audio codec to determine whether it is an audio codec sound source encoded with an audio codec, controls the outgoing mobile terminal to switch the default codec to the audio codec, and then the audio codec sound source Mobile communication network transmitting to outgoing mobile terminal If the sound source is a sound source encoded with a voice codec other than the audio codec sound source, the mobile communication network to change the audio codec, characterized in that for transmitting the sound source encoded with the voice codec to the calling mobile communication terminal Ringback tone replacement sound service providing system using. The method of claim 10, wherein the mobile communication network, Paging the called mobile communication terminal, and when there is a response to paging from the called mobile communication terminal, controlling the originating mobile communication terminal to switch the basic codec to a voice codec. Ringback tone replacement sound service providing system. The method of claim 10, wherein the mobile communication network, A sound source that stores and transmits the sound source, and generates and delivers an ISUP_CPG message including information on the ringback tone replacement sound, information on bypass mode, and control information when the sound source is the audio codec sound source. Providing device; An outgoing radio base station for receiving and transmitting a call from the outgoing mobile terminal and transmitting a request for switching to the bypass mode to transmit the audio codec sound source to the outgoing mobile terminal in the bypass mode; After receiving the call from the originating radio base station, receiving and analyzing the ISUP_CPG message from the sound source providing apparatus, confirming whether the sound source is the audio codec sound source, and causing the originating radio base station to switch to the bypass mode. An outgoing mobile communication switching station for controlling the outgoing mobile communication terminal to switch the basic codec to the audio codec and transmitting the audio codec source to the outgoing mobile terminal through the outgoing radio base station; And An incoming mobile communication switching station for setting an ISUP call with the calling mobile communication switching station, setting an ISUP call with the sound source providing device, and relaying the audio codec sound source received from the sound source providing device to the calling mobile communication switching station; Ringback tone replacement sound service providing system using an audio codec change characterized in that it comprises a. 13. The system of claim 12, wherein the terminating mobile communication switching center is: After setting up the ISUP call with the calling mobile communication switching center, paging the called mobile communication terminal, if there is a response to paging from the called mobile communication terminal, releases the ISUP call with the sound source providing apparatus, and makes an outgoing movement. A system for providing a ringback tone replacement sound using a change of an audio codec, characterized in that a communication exchange station is notified of a response of the called mobile communication terminal. 14. The system of claim 13, wherein the originating mobile communication switching center is: A system for providing a ringback tone replacement sound using an audio codec change, by controlling the originating radio base station to release the bypass mode and controlling the originating mobile communication terminal to switch the basic codec to a voice codec. . 15. The method according to claim 12 or 14, wherein the originating mobile communication switching center is And transmitting a signaling message to the calling mobile terminal to control the calling mobile terminal to switch the basic codec. The method of claim 15, wherein the signaling message, If the mobile communication network is a synchronous scheme, ringback tone replacement sound service providing system using an audio codec, characterized in that the data burst message (Data Burst Message). The method of claim 16, wherein the data burst message, It includes a Teleservice Identifier (TI) field, a Mobile Identification Number (MIN) field, and an application codec information field, wherein the TI field is a field for specifying values of TI indicating the start and end of the interval of the ringback tone replacement tone service, The MIN field is a field indicating one or more MIN of the calling mobile terminal and the called mobile communication terminal, and the applied codec information field is a field indicating a type of codec to be applied as the basic codec. Ringback tone replacement sound service providing system using. The method of claim 16, wherein the data burst message, And a Teleservice Identifier (TI) field and a Mobile Identification Number (MIN) field, wherein the TI field specifies a plurality of values representing the start and end of a section of the ringback tone replacement tone service, and corresponds to the plurality of values. Ringback tone replacement sound service providing system using an audio codec, characterized in that the field indicating the type of codec to be applied as the basic codec. 13. The system of claim 12, wherein the originating mobile communication switching center is: An audio codec for controlling the originating radio base station to set the bypass mode by transmitting a bypass setup message, which is a transcoder control message controlling the bypass mode, to the originating radio base station; Ringback tone replacement sound service providing system using the change. 15. The system of claim 14, wherein the originating mobile communication switching center is: An audio codec for controlling the originating radio base station to release the bypass mode by transmitting a bypass release message, which is a transcoder control message controlling the release mode, to the originating radio base station; Ringback tone replacement sound service providing system using the change. A mobile communication terminal receiving a mobile communication service and a ringback tone replacement sound service from a mobile communication network, and requesting the voice call to an incoming mobile communication terminal receiving a voice call using the mobile communication network, An antenna for receiving and transmitting a signaling message from the mobile communication network as an RF signal; An RF signal processor for demodulating the RF signal and transmitting a demodulated signal; A baseband converter configured to receive the demodulated signal from the RF signal processor, convert the demodulated signal into a baseband signal, and perform analog-to-digital conversion on the baseband signal to transmit a digital signal; A digital signal processor including one or more of a voice codec and an audio codec implemented by one or more of software and hardware, and setting and converting one of the voice codec and the audio codec to a basic codec; A memory unit for storing a codec changing program for setting one of the voice codec and the audio codec as the default codec; And After receiving the digital signal from the baseband converter and acquiring the signaling message, if the basic codec is changed, the digital signal processor may execute one of the voice codec and the audio codec. Control unit to set to the default codec Mobile communication terminal providing a ringback tone substitute sound service using an audio codec change, characterized in that it comprises a. The method of claim 21, wherein the mobile communication terminal, And a speaker for outputting a speech or sound decoded by one of the voice codec and the audio codec. The method of claim 21, wherein the control unit, When receiving an audio codec source encoded with the audio codec from the mobile communication network, analyzing the audio codec sound source and checking whether the audio codec specified in the audio codec sound source matches the audio codec specified in the signaling message does not match. And an audio codec specified in the audio codec sound source as the basic codec.

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