KR101247961B1 - Method, System and Terminal for Providing Multimedia Ring Back Tone Service by Using Multimedia Codec Information and Intelligent network - Google Patents

Abstract

The present invention relates to a method and system for providing a multimedia ringback tone service using multiple audio codec information and an intelligent network of a calling terminal.

The present invention relates to a method for providing a multimedia ringback tone service in a multimedia ringback tone service system including an outgoing mobile terminal, an outgoing wireless base station, an outgoing mobile communication exchange station, an incoming mobile communication exchange station, an SCP (Service Control Point), and a sound source providing server. (A) the originating mobile communication switching center receiving a call request from the calling mobile communication terminal transmitting an initial address message to the called mobile communication switching center; (b) the terminating mobile telecommunication switching center requesting a multimedia ringback tone service from the SCP; (c) the SCP receiving multiple audio codec information of the originating mobile communication terminal from the terminating mobile communication switching center; (d) When the SCP requests the terminating mobile telecommunication switching center for a call connection to the sound source providing server, the SCP transmits bypass mode switch request information to the terminating mobile telecommunication switching center to cause the originating radio base station to bypass the bypass mode. To be set to; (e) transmitting, by the SCP, multiple audio codec information, which is sound source information of a multimedia ringback tone and information on types of multiple audio codecs of the originating mobile communication terminal, to the sound source providing server; (f) the sound source providing server extracts multimedia ringback tone data which is data of the multimedia ringback tone encoded by any one audio codec type among the multiple audio codec information, and converts the multimedia ringback tone data into the terminating mobile communication exchange station. And transmitting to the originating mobile communication terminal through the originating mobile communication switching center. And (g) decoding and playing the multimedia ringback tone data by the calling mobile communication terminal using an audio codec suitable for multimedia ringback tone data among the multiple audio codecs. It provides a multimedia ringback tone service providing method using codec information and intelligent network.

According to the present invention, a multimedia ringback tone suitable for multiple audio codecs of a mobile communication terminal is provided in an intelligent network, and information for switching the codec setting of the mobile communication terminal and information of an audio codec encoded with multimedia ringback tone data are provided. By including the data, the mobile communication terminal can reproduce the multimedia ringback tone with the best sound quality, and the problem of inability to properly reproduce the multimedia ringback tone due to the loss of the signaling message can be solved.

Multimedia ringback tone, audio codec, voice codec, intelligent network

Description

Method, System and Terminal for Providing Multimedia Ring Back Tone Service by Using Multimedia Codec Information and Intelligent Network}

1 is a block diagram schematically illustrating a system for providing a multimedia ringback tone service according to an embodiment of the present invention;

2 is a block diagram schematically illustrating an internal configuration of a mobile communication terminal according to an embodiment of the present invention;

3 is a flowchart illustrating a process for distinguishing codecs of ringback tone data in a call control module according to an embodiment of the present invention;

4 is a diagram illustrating data analyzed to distinguish codecs of multimedia ringback tone data in a mobile communication terminal according to an embodiment of the present invention;

5 illustrates a data format for identification of multiple audio codecs according to a preferred embodiment of the present invention;

6A and 6B are flowcharts illustrating a process of providing a multimedia ringback tone service according to an exemplary embodiment of the present invention.

Description of the Related Art

110: outgoing mobile communication terminal 115: incoming mobile communication terminal

120: outgoing wireless base station 125: incoming wireless base station

130: outgoing mobile communication exchange station 135: incoming mobile communication exchange station

140: NO. 7 network 150: Home location register

160: SCP 170: Sound Source Server

180: sound source providing control server 182: subscriber DB

190: Internet 195: Web Server

The present invention relates to a method and system for providing a multimedia ringback tone service using multiple audio codec information and an intelligent network of a calling terminal. More specifically, the intelligent network provides a multimedia ringback tone suitable for a mobile communication terminal having one or more audio codecs, and encodes multimedia ringback tone data and information for switching the codec setting of the mobile communication terminal to the multimedia ringback tone data. The present invention relates to a system and method for providing information including codec information.

Due to the rapid development of mobile communication service, mobile communication service provides various services such as wireless internet service, video call service and multimedia ringback tone service in addition to voice call, which is the most basic service.

Among them, the multimedia ringback tone service provides the ringback tone to the caller's mobile terminal calling the called party a variety of mechanical call connection sounds such as "Tarung", that is, various music and voices designated by the called party to replace the mechanical ringback tone. In the past, an enhanced variable rate codec (EVRC) or an adaptive multi-rate codec (EVRC) may be used through a mobile communication network or an intelligent network including an outgoing mobile telecommunication switching center and an incoming mobile telecommunication switching center. AMR: Provided the sound source suitable for variable code rate voice codec such as Adaptive Multi Rate Codec (hereinafter referred to as 'AMR') as ringback tone, but nowadays, it is AAC (Advanced Audio Coding), A method for providing a ringback tone for a sound encoded with an audio codec such as AAC + or Enhanced AAC + has been proposed. In the following description, a ringback tone source suitable for a voice codec is defined as a ringback tone substitute sound, and a ringback tone source encoded with an audio codec is defined as a multimedia ringback tone.

When the above method is applied to an intelligent network, in order to provide a multimedia ringback tone to an outgoing mobile communication terminal, a specific device of the intelligent network controls the outgoing radio base station so that the outgoing radio base station is set to bypass mode. Before transmitting the multimedia ringback tone, the communication terminal transmits a signaling message such as a data burst message to cause an outgoing mobile communication terminal set as a voice codec to switch to an audio codec. Here, the bypass mode transmits the multimedia ringback tone to the calling mobile terminal without vocoding at the calling wireless base station, that is, the calling wireless base station activates only a path for transmitting the multimedia ring back tone to the calling mobile terminal. Means that.

As described above, the conventional method for providing a multimedia ringback tone to an outgoing mobile terminal in an intelligent network includes one or more audio codecs provided by the outgoing mobile communication terminal, that is, the mobile communication terminal even when the outgoing mobile communication terminal has one or more audio codecs. Without considering the characteristics, since the multimedia ringback tone is encoded by a uniform audio codec, there is a problem that the playback quality of the multimedia ringback tone may be different for each type of mobile communication terminal.

In addition, as described above, in a configuration in which the outgoing mobile communication terminal switches from a voice codec to an audio codec by transmitting a signaling message before transmitting the multimedia ringback tone from the intelligent network to the outgoing mobile communication terminal, between the outgoing mobile communication terminal and the outgoing wireless base station. When a cause such as a poor wireless environment and a poor output of a wireless base station is generated, the signaling message is lost without being transmitted to the calling mobile terminal. As a result, the outgoing mobile terminal set as the voice codec does not switch to the audio codec. There is a problem in that the sound quality is poor because the multimedia ringback tone is not reproduced by the reception or the multimedia ringback tone is reproduced by the voice codec.

In order to solve the above problems, the present invention provides a multimedia ringback tone suitable for a mobile communication terminal having one or more audio codecs in an intelligent network, and information and multimedia for switching the codec setting of the mobile communication terminal to multimedia ringback tone data. It is an object of the present invention to provide a system and method for providing ring code data including information of an audio codec encoded therein.

In order to achieve the above object, the present invention provides a multimedia in a multimedia ringback tone service system including an outgoing mobile communication terminal, an outgoing wireless base station, an outgoing mobile communication exchange station, an incoming mobile communication exchange station, a SCP (Service Control Point) and a sound source providing server. A method for providing a ringback tone service, the method comprising: (a) sending an initial address message to the called mobile switching center by the calling mobile switching center receiving a call request from the calling mobile terminal; (b) the terminating mobile telecommunication switching center requesting a multimedia ringback tone service from the SCP; (c) the SCP receiving multiple audio codec information of the originating mobile communication terminal from the terminating mobile communication switching center; (d) When the SCP requests the terminating mobile telecommunication switching center for a call connection to the sound source providing server, the SCP transmits bypass mode switch request information to the terminating mobile telecommunication switching center to cause the originating radio base station to bypass the bypass mode. To be set to; (e) transmitting, by the SCP, multiple audio codec information, which is sound source information of a multimedia ringback tone and information on types of multiple audio codecs of the originating mobile communication terminal, to the sound source providing server; (f) the sound source providing server extracts multimedia ringback tone data which is data of the multimedia ringback tone encoded by any one audio codec type among the multiple audio codec information, and converts the multimedia ringback tone data into the terminating mobile communication exchange station; It provides a method for providing a multimedia ring back tone service using the multi-audio codec information and intelligent network of the calling terminal, characterized in that it comprises the step of transmitting to the outgoing mobile terminal through the outgoing mobile communication switching center.

According to another object of the present invention, there is provided a system for providing a multimedia ring back tone in an intelligent network, the system comprising: a mobile communication terminal having multiple audio codecs and voice codecs which are one or more audio codecs; When the mobile communication terminal requests a call, an outgoing mobile communication exchange station including the telephone number of the mobile communication terminal and the multiple audio codec information, which is information on the type of the multiple audio codec of the mobile communication terminal, in the initial address message, is transmitted to the called party. ; When the originating mobile communication exchange receives the initial address message, the multi-audio codec information is transmitted while requesting processing of a multimedia ringback tone service to the intelligent network to provide the multimedia ringback tone to the mobile communication terminal. A terminating mobile communication switching center receiving the bypass mode switch request information for setting an outgoing wireless base station into the bypass mode and transmitting the received mode to the originating mobile communication switching center; Receiving the multiple audio codec information from the terminating mobile telecommunication switching center, transmitting the bypass mode switch request information to the terminating mobile telecommunication switching center, and storing / managing the sound source information of the multimedia ringback tone and the multiple audio codec information; SCP (Service Control Point); And storing multimedia ringback tone data, which is data of multimedia ringback tone encoded according to the type of audio codec applicable to the mobile communication terminal, and information for switching the codec setting of the mobile communication terminal in the multimedia ringback tone data. The present invention provides a system for providing a multimedia ringback tone service using a multi-audio codec information and an intelligent network of a calling terminal, comprising: a sound source providing server for storing multimedia ringback tone data including information of an audio codec encoded therein.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a block diagram schematically illustrating a system for providing a multimedia ringback tone service according to an exemplary embodiment of the present invention.

The system 100 for providing a multimedia ringback tone service according to an exemplary embodiment of the present invention includes an outgoing mobile communication terminal 110, an incoming mobile communication terminal 115, an outgoing wireless base station 120, a destination wireless base station 125, Outgoing mobile switching center 130, incoming mobile switching center 135, NO.7 network 140, Home Location Register (HLR) 150, Service Control Point (SCP) hereinafter ' 160), a sound source providing server 170, a sound source providing control server 180, a subscriber DB (DataBase) 182, the Internet 190, a web server 195, and the like.

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

The outgoing mobile communication terminal 110 and the incoming mobile communication terminal 115 are mobile communication terminals that perform voice calls with each mobile communication terminal using a mobile communication network or with a general landline telephone through a public switched telephone network. 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.

The calling mobile communication terminal 110 according to the preferred embodiment of the present invention requests a voice call to the called mobile communication terminal 115 of the called party by using the mobile communication network according to the caller's key operation, and the called mobile communication terminal 115. Is a mobile communication terminal that receives and outputs a multimedia ringback tone from the system 110 for providing a multimedia ringback tone service according to a preferred embodiment of the present invention, the type of an audio codec. Has multiple audio codecs each having one or more audio codecs, and the system 100 reproduces the multimedia ringback tone encoded by any one of the multiple audio codecs as decoding and ring back tone.

To this end, the outgoing mobile terminal 110 receives the ringback tone sound source data from the system 100, and encodes the ringback tone sound source data into an audio codec of a ringback tone substitute sound which is a ringback tone sound source suitable for a voice codec. In order to determine whether the multimedia ringback tone is a ringback tone source, that is, the ringback tone sound data or multimedia ringback tone data, the ringback tone source data is stored in a buffer every 20 ms, and the 20 ms period data is determined. Repeat the first byte analysis of to determine if the data currently being received is a ringback tone replacement or a multimedia ringback tone. Here, the 20 ms period data refers to ringback tone source data stored in a buffer for 20 ms.

If it is determined that the data currently being received by the calling mobile terminal 110 is multimedia ringback tone data, the calling mobile terminal 110 deactivates the voice codec in an active state and activates any one of the multiple audio codecs. By analyzing the dummy data of the ms period data (Dummy Data) to determine the type of audio codec encoding the multimedia ringback tone data in the system 100, the meaningless data among the multiple audio codecs provided by the originating mobile communication terminal 110 Decode the multimedia ringback tone by activating the audio codec that matches the type of audio codec determined through the analysis of.

Of course, when the incoming response of the incoming mobile communication terminal 115 occurs, the outgoing mobile communication terminal 110 deactivates the audio codec by receiving a signaling message from the system 100 and activates the incoming voice codec to activate the incoming mobile communication. A voice call with the terminal 115 is performed.

Description of the outgoing mobile communication terminal 110 according to a preferred embodiment of the present invention will be described in more detail with reference to FIG.

The originating radio base station 120 and the destination radio base station 125 each include a base station transmission system (BTS) and a base station controller (BSC).

In the present invention, when the outgoing wireless base station 120 receives a call call 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 station 130, and the outgoing mobile communication exchange station. Receiving a bypass switch message from the 130, it switches to the bypass mode and relays to the outgoing mobile terminal 110 without vocoding the multimedia ringback tone received from the outgoing mobile switching center 130. do. That is, only the transmission path for transmitting the multimedia ring back tone to the calling mobile terminal 110 is activated.

In addition, the originating radio base station 120 according to the preferred embodiment of the present invention releases the bypass mode and receives a voice call for a voice call (Vocoder) when receiving a bypass release message from the originating mobile communication switching center 130. After vocoding by using, and relays to the outgoing mobile communication terminal (110).

The outgoing mobile switching center 130 and the incoming mobile switching center 142 perform basic and additional service processing, subscriber's incoming and outgoing call processing location registration procedure and handoff procedure processing, interworking function with other networks, and the like. As the mobile communication switching center of the mobile communication terminal, each of the mobile communication terminal 110, the caller, the mobile subscriber of the terminating mobile communication terminal 115, information on the called party, and the location of each mobile communication terminal using the home location register 150, respectively. Identify information and status information.

 In the present invention, when the outgoing mobile communication switching station 130 receives a call call requesting a voice call from the outgoing mobile communication terminal 110 to the incoming mobile communication terminal 115, the incoming mobile communication using the home location register 150 is performed. Recognizing the switching center 135, receiving the multi-audio codec information provided by the calling mobile communication terminal 110 and the telephone number of the calling mobile communication terminal 110 from the home location register 150 and includes it in the initial address message The call is transmitted to the destination mobile communication switching center 135 to perform call setup. Here, the multiple audio codec information includes the type of multiple audio codec provided by the calling mobile communication terminal 110. For example, if the multi-audio codec provided by the outgoing mobile terminal 110 is an AAC codec, an AAC + codec, or an enhanced AAC + codec, the multi-audio codec information is divided into three types of multi-audio codecs such as AAC, AAC +, and Enhanced AAC +. do.

Upon receiving the address termination message including the bypass mode switch request information from the destination mobile telecommunication switching center 135, the source mobile telecommunication switching station 130 transmits a bypass switch message to the calling wireless base station 120 so that the calling wireless base station 120 can receive the address. ) To switch to bypass mode.

In addition, when the outgoing mobile communication switching station 130 receives the multimedia ringback tone data from the sound source providing server 170 through the incoming mobile communication switching station 135, the outgoing mobile communication terminal 110 to the outgoing mobile communication terminal 110. When the multimedia ringback tone data is transmitted in the bypass mode, and a response message including the bypass mode release request information is received from the terminating mobile communication switching station 135, it transmits the bypass release message to the originating radio base station 120 to transmit the originating radio. Controlling the base station 120 to release the bypass mode, and transmits a signaling message for the originating mobile communication terminal 110 having activated the audio codec to switch to the voice codec.

In the present invention, when the terminating mobile communication switching station 135 receives the initial address message from the originating mobile communication switching station 130, it receives the additional service information for the terminating mobile communication terminal 115 from the home location register 150 and moves the incoming call. Check whether the multimedia ringback tone service is subscribed to the communication terminal 115, and if the terminating mobile communication terminal 115 is subscribed to the multimedia ringback tone service, the SCP is provided to provide the multimedia ringback tone to the calling mobile terminal 110. Requests the 160 to process the multimedia ringback tone service, transmits multiple audio codec information included in the initial address message to the SCP 160, and then provides a sound source including the bypass mode switch request information from the SCP 160. When the call connection request to the server 170 is received, call setup is performed with the sound source providing server 170 and the bypass is transmitted to the outgoing mobile communication switching center 130. Notify the mode switch request information.

In addition, when the terminating mobile communication switching station 135 receives the multimedia ringback tone from the sound source providing server 170, the terminating mobile communication switching station 135 relays the multimedia ring back tone to the calling mobile communication switching station 130, and the receiving mobile communication terminal 115 paging a response to paging. Upon reception from the terminating mobile communication terminal 115, under the control of SCP 160, releases the call setup with the sound source providing server 170 and notifies the originating mobile communication switching station 130 that the terminating mobile communication terminal 115 has responded. By including the bypass mode release request information in the response message for the request to the originating mobile communication switching station 130 to release the bypass mode of the originating radio base station 120.

The NO.7 network 140 refers to a common line signal network composed of signal points and signal links to provide a common line signaling system standardized by the ITU-T NO.7 scheme. Here, the common line signaling scheme is a scheme defined by the ITU-T as a signaling scheme in which signal information on multiple circuits or functions and network management information for communication network management are transmitted through a single channel by an address message. That is, as a computer is used to control an exchange, a common signal line is used so that various signals processed by lines can be mutually processed by a central processing unit (CPU), so that an exchange signal necessary for telephone connection is transmitted through this signal line. to be.

 The home location register 150 is a database that stores service profiles related to subscriber information of mobile subscribers, and performs functions such as registration recognition, registration deletion, and location checking of each mobile communication terminal, and uses each mobile communication terminal. Information about the service type, such as a mobile identification number (MIN), a mobile identification number (MIN), an electronic serial number (ESN), and a multimedia ringback tone service subscription, a music providing server 170 It stores information for routing, multiple audio codec information of a mobile communication terminal including an outgoing mobile communication terminal 110 and a receiving mobile communication terminal 115, and the like.

SCP 160 is a core equipment for providing various additional services using an intelligent network, and provides service logic for various services. In other words, by performing interworking with the mobile communication switching center, the call processing necessary to perform the service is actually executed to perform the intelligent network service scenario of the mobile communication service provider.

In the present invention, the SCP 160 is used to determine the type of ringback tone sound source set for the incoming mobile communication terminal 115, that is, a ringback tone substitute sound which is a ringback tone sound source suitable for a voice codec, or a multimedia ringback tone encoded with an audio codec. Information, information on a file of a ringback tone sound source, and the like, and the eligibility check and translation of the additional service received from the terminating mobile communication switching center 135 are performed.

That is, when the SCP 160 receives a request for processing of the multimedia ringback tone service from the terminating mobile communication switching station 135, the sound source providing server 170 grasps the type of the ringback tone sound source set for the terminating mobile communication terminal 110. Requests for initial call connection preparation while transmitting routing information for, and when receiving multiple audio codec information from the destination mobile communication switching station 135, it stores and manages, and the destination mobile communication switching station 135 and the sound source providing server 170 Request a call connection to the terminating mobile communication switching center (135). At this time, the SCP 170 transmits the bypass mode switch request information to the terminating mobile communication switch station 135 so that the terminating mobile communication switch station 135 transmits the bypass mode switch request information to the source mobile communication switch station 130. .

In addition, when the SCP 160 receives the multimedia ringback tone sound source information set for the terminating mobile communication terminal 115 from the sound source providing server 170, the multi-audio codec information and ringback tone sound source information of the originating mobile communication terminal 110 are received. To transmit to the sound source providing server 170.

In addition, SCP 160 requests the terminating mobile communication switching station 135 to set a trigger detection point, and when the terminating mobile communication switching station 135 receives a request for service processing for the termination of the multimedia ringback tone service, 135) request to release the call setup with the sound source providing server 170.

In the present invention, the sound source providing server 170 is an IP for an intelligent network that stores a ringback tone sound source, that is, ringback tone data. The ringback tone data is encoded according to the type of audio codec applicable to the mobile communication terminal, that is, multimedia ringback tone data. The audio codec is stored according to the type of the audio codec, and the multimedia ringback tone data is stored including information for switching the codec setting of the originating mobile communication terminal 110 and information of the audio codec encoding the multimedia ringback tone data.

The sound source providing server 170 performs call setup with the terminating mobile communication switching center 135 and receives a request for the provision of the multimedia ringback tone set by the terminating mobile communication terminal 115 to the SCP 160, the sound source information for the sound source, and After requesting and receiving the multiple audio codec information, the multimedia ringback tone data encoded with any one audio codec type among the multiple audio codec information is extracted and transmitted to the terminating mobile communication switching center 135.

To this end, the sound source providing server 170 generates a sound source code request signal including the multiple audio codec information received from the SCP 160 and transmits it to the sound source providing control server 180, and from the sound source providing control server 180. The retrieved multimedia ringback tone data is transmitted to the destination mobile communication switching center 135 using the received ringback tone source code. Here, the sound source code request signal includes multiple audio codec information, called mobile communication terminal 115 identification information, outgoing mobile communication terminal 110 identification information, call request time zone information, and the like.

The sound source providing control server 180 is a server controlling the provision of the multimedia ringback tone service. The sound source providing control server 180 controls the sound source providing server 170 and the subscriber database (DB) 182 and moves the incoming call included in the sound source code request signal. The sound source authentication is performed using the communication terminal 115 identification information, the outgoing mobile communication terminal 110 identification information, and the call request time zone information.

Also, the sound source providing control server 180 searches for a ringback tone sound source code, which is a code designating a multimedia ringback tone suitable for the multiple audio codec information included in the sound source code request signal, and transmits the ringback tone sound source code to the sound source providing server 170. Here, the ringback tone source code stored in the sound source providing control server 180 is stored separately according to a multimedia codec, a specific caller, a caller group, and a call time zone.

The subscriber DB 182 is a database that stores and manages information of subscribers subscribed to the multimedia ringback tone service. The subscriber DB 182 provides subscriber information necessary to perform sound source authentication in the sound source providing control server 180.

The Internet 190 is a TCP / IP protocol and a number of services that exist above it, namely Hypertext Transfer Protocol (HTTP), Telnet, File Transfer Protocol (FTP), Domain Name Server (DNS), and Simple Mail Transfer Protocol (SMTP). It represents a worldwide open computer network architecture that provides the Simple Network Management Protocol (SNTP), Network File Service (NFS) and Network Information Service (NIS).

The web server 195 is connected to the sound source providing server 170 and the sound source providing control server 180 through the Internet 190 to add a multimedia ringback tone to the sound source providing server 170, and the sound source providing control server 180 ) Provides a user interface to a user terminal or mobile communication terminal such as a computer 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 call time, etc. do. To this end, the web server 195 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 according to a preferred embodiment of the present invention.

An internal configuration of a mobile communication terminal according to an exemplary embodiment of the present invention includes an RF signal processor 210, a channel decoder 220, a signal processor 230, a call control module 240, and an enhanced variable rate coder (EVRC) codec. 250, the multiple audio codec unit 260, and the like.

The RF signal processor 210 converts a wireless signal received through an antenna (not shown) into a digital signal.

The channel decoder 220 decodes the digital signal received by the RF signal processor 210, separates the signal portion and the data portion of the digital signal, and transmits the signal portion to the signal processor 230, and calls the data portion. Transmission to the control module 240.

The call control module 240 transmits the data transmitted from the channel decoder 220 to the EVRC codec 250 or from the multiple audio codec unit 260 composed of one or more audio codecs to an audio codec suitable for multimedia ringback tone data. To determine whether this is the case, the first byte of 20 ms period data stored in the buffer is repeated every 20 ms period.

If the data is determined to be multimedia ringback tone data, the EVRC codec 250 in an activated state is deactivated. After analyzing the multimedia ringback tone data, the appropriate audio codec suitable for the multimedia ringback tone data is activated in the multiple audio codec unit 260, and then the multimedia ringback tone data is transmitted to the appropriate audio codec. In addition, when the call control module 240 receives the signaling message transmitted from the originating mobile communication switching center 130, the call control module 240 reactivates the EVRC codec 250, and receives the data received from the channel decoder 220 from the EVRC codec 250. To send.

A method of establishing a transmission path of data and identifying an audio codec in the multimedia ringback tone data in the call control module 240 will be described in detail with reference to FIGS. 3 to 5.

The EVRC codec 250 is a voice encoding method used for a mobile communication service, and uses an existing mobile communication network as it is, but improves an algorithm for converting and compressing a human voice into a digital signal and an algorithm for decoding the compressed data into a voice, thereby improving call quality. Is raised to Personal Communication Services (PCS) level. The EVRC codec 250 is excellent in noise removal and transmits through a high level S / W processing process when encoding and decoding a voice, thereby realizing an optimal sound quality close to natural sound. The EVRC codec 250 may greatly improve sound quality by minimizing noise except human voice when making a call in a noisy area. The EVRC codec 250 according to the preferred embodiment of the present invention receives voice data transmitted from the call control module 240 when a call is made with the incoming mobile communication terminal 115 and the multimedia ringback tone service is terminated and a voice call is performed. Will be received.

The multiple audio codec unit 260 includes one or more audio codecs to decode the multimedia ringback tone data so as to reproduce high quality multimedia ringback tone data received through a voice call channel of the mobile communication system. Here, examples of the audio codec may be an advanced audio coding (AAC), an AAC +, an enhanced AAC + codec, or the like.

3 is a flowchart illustrating a process for distinguishing codecs of ringback tone data in a call control module according to an embodiment of the present invention.

The ringback tone data transmitted from the sound source providing server 170 is received by the RF signal processor 210 of the calling mobile communication terminal 110 and converted into a digital signal (S300). The digital signal converted by the RF signal processor 210 is decoded by the channel decoder 220 to separate the signal portion and the ringback tone data portion of the digital signal, and transmit the signal portion to the signal processor 230, and the ringback tone The data portion is transmitted to a buffer (not shown) at a period of 20 ms (S305).

The call control module 240 receives the 20 ms period data transmitted to the buffer and analyzes the information of the first byte (S310). Information of the upper 3 bits of the first byte is analyzed to determine data of a buffer (not shown) as data of an audio codec or data of an EVRC codec 250 (S315).

If the information of the upper 3 bits is '110' or '111' which is not used in the data encoded by the EVRC codec 250, it is determined as an audio codec and counted A (S320). If the upper 3 bits are not '110' or '111', the next 3 bits of information are analyzed to determine whether the 3 bits following the upper 3 bits are '000' (S325). If the 3 bits after the upper 3 bits are '000', the data of the buffer (not shown) is determined as the data of the EVRC codec 250 and counted B. If not, the data of the buffer is determined as the data of the audio codec. A counts (S530). Here, the A count means that the entire data of the ringback tone data is analyzed by a plurality of buffers (not shown), each of which stores the data at 20 ms intervals, and determined as the data of the audio codec, and the B count is the EVRC codec ( It means that it is determined by the data of 250) and integrated.

The A count and the B count are added together to analyze whether the result is 10 or more or less (S335). Although the number of buffers for storing data in a 20 ms period used as a criterion for reference is limited to 10 for convenience of explanation, a criterion for determining ringback tone data may be set in actual application.

If the sum of the A count and the B count is 10 or less, the processing for distinguishing between the voice codec and the audio codec of the call control module 240 is repeated. If the sum result is 10 or more, the magnitude of the A count and the B count is large. To compare (S340). If the A count is smaller than the B count, the received data is transmitted to the EVRC codec 250 (S345). If the A count is greater than the B count, the received data is determined to be multimedia ring back tone data and transmitted to the multiple audio codec unit 260 (S350).

FIG. 4 is a diagram illustrating data analyzed to distinguish codecs of multimedia ringback tone data in a mobile communication terminal according to an exemplary embodiment of the present invention.

4A shows a buffer that stores 20 ms period data. If 171 bits of data are stored in a 1-byte buffer for 20 ms, the block of the buffer storing 20 ms period data becomes 21 blocks. Information of the buffer '0' in which the first byte of data is stored is used by the call control module 240 to distinguish between the EVRC codec and the audio codec. In addition, the process of distinguishing the voice codec and the multimedia codec of the 20 ms period data is repeated to prevent an error of transmitting the multimedia ringback tone sound source to the EVRC codec 250. The current CDMA network transmits 171 bits of data for 20 ms, but the data transmitted from the GSM network and the access network of the fourth generation mobile communication system to be implemented in the future is not limited thereto.

4B is a diagram in which the information of the first byte is blocked in units of bits. If the upper 3 bits are '110' or '111', the call control module 240 determines the data of the buffer as the data of the multimedia codec.

4C shows the next three bits of information. If the upper 3 bits are not '110' or '111' and the next 3 bits are '000', the call control module 240 determines the data of the buffer as the data of the EVRC codec 250. Is determined as data of an audio codec.

5 illustrates a data format for identification of multiple audio codecs according to a preferred embodiment of the present invention.

5A shows a data format of a conventional 20 ms period. The conventional 20 ms periodic data format transmitted to the mobile communication terminal is transmitted as 168 bits of payload and 3 bits of dummy data among 171 bits of data.

5B illustrates a data format for identification of a multimedia codec according to a preferred embodiment of the present invention. The audio codec identification according to the preferred embodiment of the present invention uses the 3D bit to identify an audio codec suitable for multimedia ringback tone data from one or more audio codecs of the multi-audio codec unit 260 through the process of FIG. 5. Use meaningless data. The call control module 240 of the outgoing mobile terminal 110 includes an algorithm for identifying the type of audio codec by analyzing information bits of meaningless data for identification of the audio codec. By analyzing the meaningless data analysis of the multimedia ringback tone data received by the channel decoder 220, the audio codec type is identified to activate an appropriate audio codec suitable for the multimedia ringback tone data among the multiple audio codec units 260 and the multimedia ringback tone data. To decode the multimedia ringback tone data in the appropriate audio codec.

6 is a flowchart illustrating a process of providing a multimedia ringback tone service according to an exemplary embodiment of the present invention.

In the description of FIG. 6, it is assumed that a calling terminal may receive a multimedia ringback tone service through a voice call channel using multiple audio codecs other than the EVRC codec.

When the caller enters the telephone number of the called mobile communication terminal 115 to select a call by operating the calling mobile communication terminal 110 to perform a voice call with the called party, the calling mobile communication terminal 110 may call the calling wireless base station ( In step S602, a voice call is sent to the outgoing mobile communication switching center 130 through S120.

The outgoing mobile communication switching center 130, which has received a voice call, requests the location information of the incoming mobile communication terminal 115 by transmitting a phone number of the incoming mobile communication terminal 115 to the home location register 150 (S604). The home location register 150 queries the location of the terminating mobile communication terminal 115 to recognize the terminating mobile communication switching station 135 and requests routing information from the terminating mobile communication switching station 135 (S206). The destination mobile communication switching station 135 transmits its routing information to the home location register 150 and responds (S608), and the home location register 150 transmits the received routing information to the calling mobile communication switching center 130. In response to the location information request of the incoming mobile communication terminal 115 (S610).

The originating mobile switching center 130, which has obtained the location information of the terminating mobile communication terminal 115, that is, the routing information for the terminating mobile communications switching station 135, makes an outgoing movement in order to attempt a call connection with the terminating mobile communications switching station 135. The initial address message including the telephone number of the communication terminal 110 and the multiple audio codec information of the outgoing mobile communication terminal 110 is transmitted to the destination mobile communication switching center 135 (S612).

Receiving the initial address message, the terminating mobile communication switching center 142 checks whether the terminating mobile communication terminal 115 subscribes to the ringback tone service using the home location register 150 (S614). The mobile communication terminal 110 provides a conventional ringback tone, that is, a mechanical ringback tone such as "Tungreung" (S616), and when subscribed to the ringbacktone service, sends it to the SCP 160 to provide a ringbacktone service. The phone number of the mobile communication terminal 110 and the phone number of the incoming mobile communication terminal 115 are transmitted, and a service process is requested (S618). Here, since the procedure for providing a conventional ring back tone as in step S616 is a well known technique, detailed description thereof will be omitted.

The SCP 160, which has received a request for service processing from the terminating mobile communication switching station 135, encodes an audio codec to determine whether the ringback tone source set for the terminating mobile communication terminal 115 is a ringback tone substitute sound which is a ringback tone sound source suitable for the voice codec. By checking whether the multimedia ringback tone service is requested by checking whether the multimedia ringback tone is requested, the mobile communication switching center 135 requests the preparation of an initial call connection (S620).

The terminating mobile telecommunication switching center 135 that is requested to prepare for the initial call connection transmits multiple audio codec information of the originating mobile communication terminal 110 to the SCP 160 (S622).

Upon receiving the multiple audio codec information, the SCP 160 requests a call connection between the terminating mobile communication switching station 135 and the sound source providing server 170 to the terminating mobile communication switching station 135 (S624). At this time, the SCP 160 transmits the bypass mode switch request information to the terminating mobile communication switch station 135 so that the terminating mobile communication switch station 135 transmits the bypass mode switch request information to the originating mobile communication switch station 130. .

The terminating mobile communication switching center 135, which has been requested to connect to the sound source providing server 170, transmits an initial address message to attempt a call connection with the sound source providing server 170 (S626), and from the sound source providing server 170. The call connection procedure is completed by receiving the address termination message (S628).

The terminating mobile communication switching station 135, which has completed the call connection procedure, transmits an address termination message to the calling mobile communication switching station 130, and completes the call connection procedure with the calling mobile communication switching station 130 to the calling mobile communication switching station 130. The bypass mode switch request information is notified (S630).

Although not shown in FIG. 6, the originating mobile switching center 130 notified of the bypass mode switch request information requests the originating radio base station 120 to set the bypass mode so that the multimedia ringback tone data is transmitted. Request to deliver to the outgoing mobile terminal 110 in the bypass mode without going through).

On the other hand, the sound source providing server 170 that has performed call setup with the incoming mobile communication switching center 135 requests the sound source information for the sound source and the multi-audio codec information of the calling mobile communication terminal 110 to the SCP 160, After receiving this, the multimedia ringback tone data encoded by any one audio codec type is extracted from the multi-audio codec information and transmitted to the terminating mobile telecommunication switching center 135, and the terminating mobile telecommunication switching station 135 transmits to the originating telecommunication switching center ( 130, the outgoing mobile communication switching center 130 transmits to the outgoing mobile communication terminal 110 through the outgoing wireless base station 120 (S632, S634, S636). To this end, the sound source providing server 170 generates a sound source code request signal including the multiple audio codec information received from the SCP 160 and transmits it to the sound source providing control server 180, although not shown in FIG. 6. The multimedia ringback tone data retrieved using the ringback tone source code received from the providing control server 180 is transmitted to the destination mobile communication switching center 135.

The outgoing mobile communication terminal 110 receiving the multimedia ringback tone data can reproduce a high quality multimedia ringback tone by decoding the multimedia ringback tone with an audio codec suitable for the multimedia ringback tone among the multiple audio codecs as described with reference to FIGS. 3 to 5. There is (S638).

Meanwhile, in step S634, SCP 160 having transmitted the sound source information and the multiple audio codec information to the sound source providing device 180 requests the incoming mobile communication switching station 135 to set a response trigger detection point (S640), and proceeds with the call progress. Request to continue (S642). The terminating mobile communication switching station 135 paging the terminating mobile communication terminal 115 to notify that there is a call request from the calling mobile communication terminal 110 (S644), and the terminating mobile communication terminal 115 rings according to the paging request. After notifying the called party that there is a call request in various ways such as vibration, and when an incoming event occurs such that the called party recognizes it and presses a specific key button, a response to paging is transmitted to the called mobile communication switching center 135 (S646). ).

Receiving a response to paging, the terminating mobile telecommunication switching center 135 requests the service processing to notify the end of the multimedia ringback tone service to the SCP 160 (S648), SCP 160 to the terminating mobile telecommunication switching station 135 Request to release the call with the sound source providing server 170 (S650). The incoming mobile communication exchange station 135 that has been requested to release the call requests the release of the call to the sound source providing server 170 (S652), and the sound source providing server 170 responds to the call release to the incoming mobile communication exchange station 135 in response to the call release. (S654) The call between the incoming mobile telecommunication switching center 135 and the sound source providing server 170 is completed.

The terminating mobile communication exchange station 135 that has completed the call release with the sound source providing server 170 includes the bypass mode release request information in the response message indicating that the terminating mobile communication terminal 115 has responded to the calling mobile communication exchange station 130. Request to release the bypass mode of the originating radio base station 120 to the originating mobile communication switching center 130 (S656).

Receiving the response message, the outgoing mobile communication switching center 130 transmits a bypass release message to the outgoing wireless base station 120 to control the outgoing wireless base station 120 to release the bypass mode, and the outgoing mobile communication terminal 110. Send a signaling message to control the outgoing mobile terminal 110, which activates the audio codec, to switch to the voice codec (S658), and sends alert information to the outgoing mobile terminal 110 to receive the call. The mobile communication terminal 115 notifies that it has responded (S660). The originating mobile communication terminal 110 analyzes the signaling message received in step S658 and converts the basic codec into a voice codec (S662).

Thereafter, a voice call channel is established between the outgoing mobile terminal 110, the outgoing mobile communication exchange station 130, the incoming mobile communication exchange station 135, and the incoming mobile communication terminal 115 to move the incoming mobile communication terminal 110 with the incoming mobile communication terminal 110. A voice call is performed between the communication terminals 115 (S664).

Accordingly, the mobile communication network can provide a high quality ringback tone replacement sound to the mobile communication terminal by providing a ringback tone replacement sound source by adaptively changing the codec by dividing the ringback tone replacement sound service interval and the voice call service interval. In addition, the mobile communication terminal has a multi-audio codec and a voice codec to decode and play the multimedia ringback tone with an audio codec suitable for the multimedia ringback tone among the multiple audio codecs, and the voice call is decoded and reproduced by the voice codec, thereby providing a high quality ring. A backtone replacement sound service and a voice call service may be performed.

In addition, a high quality ringback tone replacement sound using an intelligent network, that is, SCP 160, is minimized so as to minimize the modification or change of other devices of the existing mobile communication network such as the outgoing mobile communication switching station 130, the incoming mobile communication switching station 135, and the like. Can provide services.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of 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, an intelligent network provides a multimedia ringback tone suitable for multiple audio codecs of a mobile communication terminal and encodes information and multimedia ringback tone data for switching the codec setting of the mobile communication terminal. By including the information in the multimedia ringback tone data, it is possible to reproduce the multimedia ringback tone in the best sound quality in the mobile communication terminal, and to solve the problem of not properly playing the multimedia ringback tone due to the loss of the signaling message.

Claims (7)

A method for providing a multimedia ringback tone service to an originating mobile terminal in a multimedia ringback tone service system including an originating radio base station, an originating mobile communication switching center, an incoming mobile communication switching center, a service control point (SCP), and a sound source providing server, (a) the originating mobile communication switching center receiving the call request from the calling mobile communication terminal transmitting an initial address message to the called mobile communication switching center; (b) the terminating mobile telecommunication switching center requesting a multimedia ringback tone service from the SCP; (c) the SCP receiving multiple audio codec information of the originating mobile communication terminal from the terminating mobile communication switching center; (d) When the SCP requests the terminating mobile telecommunication switching center for a call connection to the sound source providing server, the SCP transmits bypass mode switch request information to the terminating mobile telecommunication switching center to cause the originating radio base station to bypass the bypass mode. To be set to; (e) transmitting, by the SCP, multiple audio codec information, which is sound source information of a multimedia ringback tone and information on types of multiple audio codecs of the originating mobile communication terminal, to the sound source providing server; And (f) the sound source providing server extracts multimedia ringback tone data which is data of the multimedia ringback tone encoded by any one audio codec type among the multiple audio codec information, and converts the multimedia ringback tone data into the terminating mobile communication exchange station; Transmitting to the outgoing mobile communication terminal through the outgoing mobile communication switching center; Method for providing a multimedia ringback tone service using the multi-audio codec information and the intelligent network of the calling terminal comprising a. delete A system for providing a multimedia ringback tone to a mobile communication terminal having multiple audio codecs and voice codecs, which are one or more audio codecs in an intelligent network, When the mobile communication terminal requests a call, an outgoing mobile communication exchange station including the telephone number of the mobile communication terminal and the multiple audio codec information, which is information on the type of the multiple audio codec of the mobile communication terminal, in the initial address message, is transmitted to the called party. ; When the originating mobile communication exchange receives the initial address message, the multi-audio codec information is transmitted while requesting processing of a multimedia ringback tone service to the intelligent network to provide the multimedia ringback tone to the mobile communication terminal. A terminating mobile communication switching center receiving the bypass mode switch request information for setting an outgoing wireless base station into the bypass mode and transmitting the received mode to the originating mobile switching center; Receiving the multiple audio codec information from the terminating mobile telecommunication switching center, transmitting the bypass mode switch request information to the terminating mobile telecommunication switching center, and storing / managing the sound source information of the multimedia ringback tone and the multiple audio codec information; SCP (Service Control Point); And Stores multimedia ringback tone data, which is data of multimedia ringback tone encoded according to the type of audio codec applicable to the mobile communication terminal, and information for switching the codec setting of the mobile communication terminal and the multimedia ring in the multimedia ringback tone data. Sound recording server that stores information of audio codec which encoded backtone data A system for providing a multimedia ringback tone service using multiple audio codec information and an intelligent network of a calling terminal, comprising: a. The method of claim 3, wherein The mobile communication terminal stores the multimedia ringback tone data in a buffer at a predetermined cycle, analyzes dummy data of the periodic data, which is data stored in the buffer at a predetermined cycle, and uses the audio codec suitable for the multimedia ringback tone data. A system for providing a multimedia ringback tone service using a multi-audio codec information and an intelligent network of a calling terminal characterized by decoding ringback tone data. The method of claim 3, wherein The sound source providing server is a system for providing a multimedia ringback tone service, characterized in that for storing the information of the audio codec encoding the multimedia ringback tone data in the meaningless data of the multimedia ringback tone data. A method of providing a service for a multimedia ringback tone by receiving ringback tone sound data transmitted through an intelligent network in a mobile communication terminal having multiple audio codecs, which are a plurality of audio codecs having different types of audio codecs. Determining whether the ringback tone source data is data of a ringback tone substitute sound that is a ringback tone source suitable for a voice codec or multimedia ringback tone data that is a ringback tone sound source encoded by an audio codec; If it is determined that the ringback tone source data is multimedia ringback tone data, deactivating a voice codec and storing the multimedia ringback tone data in a buffer at regular intervals; And Decoding the multimedia ringback tone data with an audio codec suitable for a type of an audio codec which encodes the multimedia ringback tone data among the multiple audio codecs by analyzing dummy data of constant period data, which is data stored in a buffer at a predetermined period. step Method for providing a multimedia ring back tone service comprising a. In a mobile communication terminal provided with a plurality of audio codecs, which are a plurality of audio codecs of different types of audio codecs (Codec), and receives ringback tone sound data transmitted through an intelligent network to provide a service for multimedia ringback tone, A buffer for storing the multimedia ringback tone data at a predetermined period; And It is determined whether the ringback tone source data is data of a ringback tone substitute sound which is a ringback tone sound source suitable for a voice codec or multimedia ringback tone data which is a ringback tone sound source encoded by an audio codec, and the ringback tone sound source data is multimedia ringback tone data. If it is determined, disable the voice codec Call control module for decoding the multimedia ringback tone data with an audio codec suitable for the multimedia ringback tone data by analyzing the dummy data of the periodic data, which is the data stored in the buffer at regular intervals. A mobile communication terminal providing a multimedia ring back tone service, comprising: a.

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