KR100723697B1 - Method for providing multimedia ringback tone service and mobile communication terminal for mobile communication system and multimedia ringback tone service - Google Patents

Abstract

The present invention relates to a method for providing a multimedia ringback tone service, a mobile communication system, and a mobile communication terminal for a multimedia ringback tone service.

The present invention utilizes a home location register (HLR) in which profile information including whether a subscriber subscribes to a ringback tone service and a sound source providing server storing ringback tone sound sources is used. A method for providing a multimedia ringback tone service in which a called-back subscriber sets a ringback tone source previously set in a sound source providing server when a call is made by the calling-party mobile terminal, the method comprising: (a) the called-party mobile terminal is connected to the called-party mobile communication terminal; When the call is attempted to the terminal, receiving location information of the called mobile communication terminal, whether the called mobile terminal subscribes to the ringback tone service, and a plurality of multimedia codec information supported by the calling mobile terminal from the home location register. ; (b) if the called-party mobile communication terminal is subscribed to a ringback tone service, transmitting an ISUP (ISDN User Part) call connection request message including a plurality of multimedia codec information to a sound source providing server; (c) requesting a setting of a multimedia codec to an originating base station controller to activate a routing path for a ringback tone service; And (d) receiving the selected ringback tone sound source from a sound source providing server using a plurality of multimedia codec information and transmitting the received ringback tone sound source to a calling party mobile terminal. .

According to the present invention, by using various kinds of multimedia codecs in the ringback tone service, it is possible to operate a multimedia codec for high quality music during the ringback tone period, and propose a method for operating a voice codec such as EVRC during a voice call. It has the effect of providing quality ringback tone service.

Ringback tone, mobile switching center, multimedia codec, vocoder, mobile communication terminal

Description

Method and System for Providing Multimedia Ring Back Tone Service and Mobile Communication Terminal for Multimedia Ring Back Tone Service

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 conceptual diagram briefly illustrating a process of providing a multimedia ringback tone service according to an embodiment of the present invention;

3A and 3B are detailed views illustrating a process of providing a multimedia ringback tone service according to an embodiment of the present invention;

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

5 is a flowchart illustrating a process for distinguishing between a voice codec and an audio codec of a call control module according to an embodiment of the present invention;

6 is a view showing a method for analyzing data in a mobile communication terminal according to an embodiment of the present invention;

7 is a diagram illustrating a method for additional transmission of information bits for identification of a multimedia codec according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: calling mobile terminal 102: base station transmitter

104: base station controller 106: calling mobile communication switching center

108: NO.7 Network 110: Home Location Register

112: destination mobile communication switching center 114, 124: gateway

116: sound source providing server 118: Internet

120: sound source providing control server 122: subscriber DB

126: web server 400: RF signal processing unit

410: channel decoder 420: signal processing unit

430: call control module 440: EVRC codec

450: multimedia codec unit

The present invention relates to a method for providing a multimedia ringback tone service, a mobile communication system, and a mobile communication terminal for a multimedia ringback tone service. More specifically, when the calling mobile terminal supports a multimedia codec capable of improving the quality of music in addition to a voice-only codec such as EVRC (Enhanced Variable Rate Codec), the multimedia codec for high quality music is operated during the ringback tone period. In the case of voice call, a method of operating a voice codec such as EVRC is proposed to provide a multimedia ringback tone service that provides a high quality ringback tone service, and to a mobile communication terminal for a mobile communication system and a multimedia ringback tone service. It is about.

As computer, electronic, and communication technologies have made rapid progress, various wireless communication services using wireless networks have been provided. The most basic wireless communication service is a wireless voice call service that provides a voice call to a mobile terminal user wirelessly, which can provide a service regardless of time and place. In addition, while supplementing the voice call service by providing a text message service, recently, a wireless Internet service that provides an Internet communication service to a user of a mobile communication terminal through a wireless communication network has emerged.

Therefore, the subscribers of the mobile communication service can freely move and talk with the other party anytime and anywhere by using the wireless communication service, and through the wireless Internet service, various information necessary for life, for example, news, weather, sports, securities, Exchange rates or traffic information may be provided in various forms such as text, voice, or image.

As a result of the development of mobile communication technology, a service provided by a code division multiple access (CDMA) mobile communication system transmits data such as circuit data and packet data as well as voice service. It is developing into a multimedia communication service.

In addition, recently, IMT-2000 (International Mobile Telecommunication 2000) (eg, CDMA2000 1X, 3X, EV-DO, WCDMA (WideBand CDMA), a third generation mobile communication system that has been standardized by ITU-R due to the development of information communication. ) And the like are commercially available. Recently, the IS-95C network, which has evolved from the existing IS-95A and IS-95B networks, transmits up to 307.2 Kbps, which is much faster than the 14.4 Kbps or 56 Kbps data rate that can be supported in the IS-95A and IS-95B networks. It offers wireless internet at speed. In particular, by using IMT-2000 service, it is possible to provide various multimedia services (AOD, VOD, etc.) at higher speed as well as improving existing voice and WAP service quality.

On the other hand, in recent years, a ring back tone (RBT) service or a so-called coloring RBT (CRBT: Coloring RBT), which allows a caller to hear various sounds designated by the called party of the mobile communication terminal as a call waiting tone from the other party's mobile terminal or a general telephone. ) The service is in the spotlight. The ringback tone service provides the caller with the ringback tone specified by the called party. The ringback tone service is used to listen to the sound of birds, water, etc., as well as the latest songs or pop songs, instead of the mechanical call waiting sound generated during the existing call, for example, "following". In addition, it is a service that enables you to use your own prerecorded voice as ringback tone.

As the ringback tone service is provided, the other party can feel auditory satisfaction by listening to the sound of a sound source designated by the called party instead of listening to a uniform mechanical ringback tone.

On the other hand, most mobile communication terminals use a voice codec having a variable bit rate such as EVRC for efficiency of a voice call and optimization of a wireless channel. Here, EVRC is a method of encoding voice information variably according to the amount of information of a voice. In the silent period where a caller does not speak, voice encoding is performed at a low rate of information, and when there is a large amount of information, encoding is performed at high speed. This EVRC can be seen in an efficient manner compared to the previous method of always encoding at a constant rate. By using this, the system capacity of a code division multiple access (CDMA) mobile communication system can be increased, and power consumption can be saved at the same time.

However, such a voice codec having a variable bit rate such as EVRC has a problem in that music quality is degraded due to a variable bit rate coding error for music such as a background sound having almost no silent section. To overcome this, music service providers are actually trying to minimize sound damage by voice codecs by extracting the sound source and modifying the sound source to match the EVRC. This sound source correction is a preprocessing processing or sound engineer considering the characteristics of the EVRC. Rely on the manual work of.

However, these works can complement the quality of the music service through the EVRC to a level equivalent to the voice quality, but there is a problem that it is difficult to improve the quality of the music service. Due to these problems, most of the high quality music services currently in service use high quality multimedia codecs separately, and provide music using data channels rather than voice channels. However, most of these commercialized multimedia service codecs require a transmission speed of 16 K or more, and in order to satisfy these transmission speeds, a download service or a real time multimedia service is provided using a data communication channel.

Therefore, if the music service using the multimedia codec is used in the ringback tone service, the sound quality can be expected to improve, but there are still problems of the data rate required for the multimedia voice transmission and the use of the voice channel rather than the data channel. do. Of these, the data rate problem can be solved theoretically by modifying the encoding and decoding algorithms of the multimedia codec so that the average data rate is 8K or less. However, there is a practical problem that some modification of the mobile communication system is inevitable in order to utilize a multimedia codec whose average transmission rate is modified to 8K or less for a voice channel for which a ringback tone service is currently performed.

In order to solve the above problems, the present invention provides a high-quality music during a ringback tone when the calling mobile terminal supports a multimedia codec capable of improving the quality of music in addition to a voice-only codec such as EVRC (Enhanced Variable Rate Codec). A method for providing a multimedia ringback tone service providing a high quality ringback tone service by presenting a method for operating a multimedia codec such as EVRC during voice call and a mobile communication system and a multimedia ringback tone Its purpose is to provide a mobile communication terminal for a service.

Accordingly, according to a first object of the present invention, a home location register (HLR) storing profile information including whether a subscriber subscribes to a ringback tone service or a sound source providing server storing ringback tone sound sources is used. A method for providing a multimedia ringback tone service in which, when a calling party calls a called subscriber, a ringback tone source preset by the called subscriber in the sound source providing server is played by the calling mobile terminal, the method comprising: (a) calling mobile; When the communication terminal attempts to connect the call to the called mobile terminal, the location information of the called mobile terminal from the home location register, whether the called mobile terminal subscribes to the ringback tone service, and the plurality of mobile terminals supported by the calling mobile terminal are determined. Receiving multimedia codec information; (b) if the called-party mobile communication terminal is subscribed to a ringback tone service, transmitting an ISUP (ISDN User Part) call connection request message including a plurality of multimedia codec information to a sound source providing server; (c) requesting an originating base station controller to set a multimedia codec to activate a routing path for a ringback tone service; And (d) receiving the selected ringback tone sound source from a sound source providing server using a plurality of multimedia codec information and transmitting the received ringback tone sound source to a calling party mobile terminal. .

In addition, according to a second object of the present invention, a home location register (HLR) storing profile information including whether a subscriber subscribes to a ringback tone service, and a sound source providing server storing ringback tone sound sources are used. In the system for providing a multimedia ringback tone service, so that when the calling subscriber calls the called subscriber, the ringback tone sound source set in advance by the called subscriber in the sound source providing server is played by the calling mobile terminal. Attempts to connect the call to the called mobile terminal, receives an ISUP (ISDN User Part) call connection request message containing a plurality of multimedia codec information from the calling mobile communication switching center and transmits it to the sound source providing server. Routing path for ringback tone service by requesting multimedia codec setting from exchange It provides a system for providing a multimedia ringback tone service, characterized in that it comprises a receiving mobile communication switching station for receiving a ringback tone sound source convertible to a multimedia codec from the sound source providing server and transmitting to the calling mobile communication exchange. .

In addition, according to a third object of the present invention, a home location register (HLR) storing profile information including whether a subscriber subscribes to a ringback tone service and a sound source providing server storing a ringback tone sound source are used. In the system for providing a multimedia ringback tone service, so that when the calling subscriber calls the called subscriber, the ringback tone sound source set in advance by the called subscriber in the sound source providing server is played by the calling mobile terminal. Attempts to make a call to the called mobile terminal, receives from the home location register whether or not the called mobile terminal subscribes to a ringback tone service and a plurality of multimedia codecs supported by the calling mobile terminal, If your device is subscribed to the ringback tone service, include the multimedia codec information. An ISUP (ISDN User Part) call connection request message to a sound source providing server, and comprises a calling mobile communication switching center receiving a ringback tone sound source convertible to a multimedia codec from the sound source providing server and transmitting the ringback tone sound source to a calling mobile terminal; It provides a system for providing a multimedia ring back tone service, characterized in that.

In addition, according to a fourth object of the present invention, a home location register (HLR) storing profile information including whether a subscriber subscribes to a ringback tone service and a sound source providing server storing a ringback tone sound source are used. In the mobile communication terminal for a multimedia ringback tone service, when the calling subscriber calls the called subscriber, the ringback tone source preset by the called subscriber in the sound source providing server is played by the calling mobile terminal. A call control module that controls to change the path of the ringback tone source data from an enhanced variable rate coder (EVRC) codec to a multimedia codec when receiving data of a ringback tone sound source including information; And a multimedia codec unit for decoding the data of the ringback tone sound source received through the communication network through the multimedia codec when the path of the ringback tone sound source data is changed to the multimedia codec under the control of the call control module. Provide a terminal for the service.

In addition, according to a fifth object of the present invention, a home location register (HLR) storing profile information including whether a subscriber subscribes to a ringback tone service and a sound source providing server storing a ringback tone sound source are used. When the calling subscriber calls the called subscriber, the ringback tone source preset by the called subscriber in the sound source providing server receives the data of the ringback tone sound source including the plurality of multimedia codec information. Variable Rate Coder) When the path of the ringback tone source data is changed to the multimedia codec under the control of the call control module and the call control module controlling to change from the codec to the multimedia codec, the data of the ringback tone source received through the communication network is converted into the multimedia codec. Originating mobile communication including a multimedia codec unit for decoding through A mobile communication terminal control method for a multimedia ring back tone service to play to the end stage, (a) receiving data in the RBT sound sources comprising a plurality of multimedia codec information from the caller-side mobile switching center; (b) analyzing data of the received ringback tone sound source and determining the data of the ringback tone sound source as data of an EVRC codec or data of a multimedia codec; (c) transmitting from the multimedia codec unit of the ringback tone source to a multimedia codec suitable for the ringback tone source; And (d) decoding and playing the ringback tone source through the multimedia codec.

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.

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.

As shown in FIG. 1, a system for providing a multimedia ring backtone service according to a preferred embodiment of the present invention includes an originating mobile terminal 100, a base transceiver station (BTS) 102, and a base station controller ( BSC: Base Station Controller (104), originating mobile communication switching center 106, No. 7 network 108, home location register (HLR) 110, terminating mobile communication switching center 112, Gateways 114 and 124, a sound source providing server 116, the Internet 118, a sound source providing control server 120, a subscriber database 122, a web server 124, and the like.

The connection of each component is outlined as follows. The home location register (110) has information about the subscriber and is the source mobile communication switching station (106) and the destination mobile communication via a signaling transfer protocol (STP) based NO.7 network 108. Communicate with the switching center 112. Here, the source mobile communication switching station 106 and the destination mobile communication switching station 112 are connected to the sound source providing server 116 that stores the sound source through the gateway 114 equipment. In addition, the source mobile communication switching center 106 and the destination mobile communication switching center 112 are connected with the base station controller 104 to support access for mobile communication. The base station controller 104 communicates with a user mobile communication terminal, and is responsible for resource allocation and vocoder control for a voice call channel. Meanwhile, the sound source providing server 116 is connected to the subscriber database 122 and the sound source providing control server 120 through the Internet 118.

Hereinafter, the main components according to the preferred embodiment of the present invention will be described in more detail.

The calling mobile terminal 100 according to the preferred embodiment of the present invention is a terminal capable of performing a voice call and a video call with each other through a mobile communication network and performing data communication through a wireless Internet connection. In addition, the calling mobile terminal 100 according to a preferred embodiment of the present invention uses H.245 for call control, H.245 for call setup and call signaling, audio codec and video codec. Support. That is, the terminal may receive a music service through a voice call channel using a multimedia codec other than EVRC (Enhanced Variable Rate Codec) for voice call. Therefore, when the caller's mobile communication terminal 100 according to the preferred embodiment of the present invention receives a ringback tone sound source, the caller's mobile communication terminal 100 plays the multimedia codec according to the sound source.

Here, examples of the multimedia codec may be AAC (Advanced Audio Coding), AAC +, Enhanced AAC +, AMR-WB, AMR-WB + codec, etc. AAC is used for music distribution service using the Internet as a voice compression method and MP3 In general, ATRAC3 (Adaptive Transform Acoustic Coding 3) is used. AAC has a higher compression rate than MP3, but the sound quality is slightly lower, so it is suitable for music distribution using personal mobile communication (telephone). In addition, AMR (Adaptive Multi-Rate) voice codec is a voice codec adopted as a standard of IMT-2000 W-CDMA, and bit transmission error in mobile communication is the biggest cause of deterioration of call quality. In order to solve this problem, AMR uses a method of improving overall sound quality by variably adjusting a bit for speech compression and a bit for channel coding according to bit error degree among the allowed bits. In other words, in the environment with a lot of bit errors, many bits can be modified by allocating bits to channel coding, and in the environment with little bit errors, many bits are allocated to the voice compressor to improve voice compression performance.

An internal configuration of the calling mobile terminal 100 according to the preferred embodiment of the present invention will be described in detail later with reference to FIG.

The base station transmitter 102 according to the preferred embodiment of the present invention is a network endpoint device that directly interworks with a mobile communication terminal by performing baseband signal processing, wired / wireless conversion, and transmission and reception of a wireless signal. The base station transmitter 102 receives a call attempt from the calling mobile terminal 100 to the called mobile terminal (not shown) through a traffic channel among the signal channels, and transmits the received call attempt to the calling base station controller. Send to 104.

The base station controller 104 according to the preferred embodiment of the present invention controls the base station transmitter 102, and assigns and releases radio channels to the mobile communication terminal, controls the transmission output of the mobile communication terminal and the base station transmitter 102, and inter-cell software. Soft Handoff and Hard Handoff Determination, Transcoding and Vocoding, Global Positioning System (GPS) Clock Distribution, Operation and Maintenance for Base Station Transmitter 102 Perform the function.

Mobile communication switching centers (106, 112) according to a preferred embodiment of the present invention performs a control function for the mobile communication network to operate efficiently and the exchange function for the call request of the calling mobile terminal 100. That is, basic and additional service processing of the mobile communication terminal, incoming and outgoing call processing of the subscriber, location registration and handoff procedure processing, interworking with other networks, and the like. The mobile communication switching centers (106, 112) of the IS-95 A / B / C system include an Access Switching Subsystem (ASS) that performs distributed call processing, an Interconnection Network Subsystem (INS) that performs centralized call processing, Subsystems include a Central Control Subsystem (CCS), which is in charge of centralizing operations and maintenance, and a Location Registration Subsystem (LRS), which performs storage and management of information on mobile subscribers. In addition, mobile switching centers 106 and 112 for 3rd and 4th generations may include an Asynchronous Transfer Mode (ATM) switch (not shown). The ATM switch is a cell-by-cell packet transmission that provides transmission speed and efficiency of line use. To increase.

The calling mobile communication switching station 106 according to the preferred embodiment of the present invention receives a call from the home location register 110 when the calling mobile communication terminal 100 attempts to connect to a called mobile communication terminal (not shown). Receives whether the mobile communication terminal (not shown) subscribes to the ringback tone service and receives a plurality of multimedia codec information supported by the calling mobile communication terminal 100. At this time, if the called-side mobile communication terminal (not shown) is subscribed to the ringback tone service, the sound source providing server 116 receives the ISUP (ISDN User Part) call connection request message including the multimedia codec information through the incoming mobile communication switching center 112. To send.
In addition, when the sound source providing server 116 transmits a ringback tone sound source that can be converted into a multimedia codec, the ringback tone sound source is received through the destination mobile communication switching center 112 and passed through the base station transmitter 102 and the base station controller 104. It transmits to the calling mobile terminal 100.

At this time, when the calling party mobile communication switching station 106 transmits an ISUP call connection request message including a plurality of multimedia codec information to the called party, the called party sends the first codec setting message including the multimedia codec information to the calling party. To 106. Then, the calling mobile communication switching station 106 transmits a second codec setting message requesting the multimedia codec setting to the calling base station controller 104, so that the calling base station controller 104 encodes the multimedia codec by the sound source providing server. Controls to bypass the ringback tone source without encoding. To this end, the mobile communication switching centers 106 and 112 according to a preferred embodiment of the present invention communicate with the home location register 110 at the time of registering the subscriber and route information to the sound source providing server 116 and the presence or absence of subscription to the ringback tone service. Save the information to

On the other hand, the calling mobile communication switching station 106 transmits the ISUP call connection request message to the sound source providing server 116 through the called mobile communication switching station 112, and then requests the codec setting to the calling base station controller 104. To activate the routing path for the ringback tone service. That is, if the multimedia codec supported by the calling mobile terminal 100 is a codec other than EVRC, the codec setting request, which is a control message for controlling the ringback tone sound source to simply pass through the vocoder of the calling base station controller 104, is called. It is transmitted from the mobile telecommunication switching center 112 to the calling mobile telecommunication switching center 106.

On the other hand, when a call is received by the called-party mobile communication terminal (not shown), the called-party mobile communication switching center 112 requests to change the codec setting for the incoming call signal and the voice call of the called-party mobile communication terminal (not shown). Sends a signal to the calling mobile telecommunication switching center 106. The originating mobile telecommunication switching center 106 releases the ISUP call connection with the sound source providing server 116 when receiving the incoming call signal, and when the calling codec setting change request signal is received, the originating base station controller 104 and the originating mobile. Request a codec setting change to the communication terminal 100 to enable a voice call.

A home location register (HLR) 110 according to a preferred embodiment of the present invention performs functions such as registration recognition, registration deletion, and location confirmation of a mobile communication terminal. In addition, the home location register 110 includes profile information including whether the subscriber subscribes to a ringback tone service, information for routing to the sound source providing server 116, and a plurality of multimedia codec information supported by the calling mobile terminal 100. Is stored. Here, the plurality of multimedia codec information supported by the calling party mobile terminal 100 are set and stored as additional service subscription information of the calling party profile.

The sound source providing server 116 according to the preferred embodiment of the present invention stores a ringback tone sound source and receives a plurality of ISUP call connection request messages from the destination mobile communication switching station 112. The selected ringback tone source is transmitted to the called party's mobile telecommunication switching center 112 using the codec information.

In the sound source providing server 116 according to the preferred embodiment of the present invention, various sound sources are encoded and stored according to the type of codec applicable to the user's mobile communication terminal, and the sound source providing server 116 mediates the gateway 114. It connects to the mobile telecommunication switching centers 106 and 112 to provide a sound source suitable for the type of codec requested by the mobile telecommunication switching stations 106 and 112.

In addition, the sound source providing server 116 according to the preferred embodiment of the present invention generates a sound source code request signal including a plurality of multimedia codec information received from the source mobile communication switching station 106 to provide a sound source control control server 120 And the ringback tone sound source retrieved using the ringback tone sound source code received from the sound source providing control server 120 to the calling mobile communication switching center 106. Here, the sound source code request signal includes a plurality of multimedia codec information, called-party mobile communication terminal (not shown) identification information, calling-party mobile communication terminal 100 identification information and call request time zone information.

The sound source providing control server 120 according to the preferred embodiment of the present invention communicates with the sound source providing server 116 via the Internet network 118 and includes a plurality of multimedia codec information from the sound source providing server 116. Upon receiving the request signal, the ringback tone source code convertible to the multimedia codec is searched and transmitted to the sound source providing server 116. Here, the ringback tone source code stored in the sound source providing control server 120 may be stored separately according to a multimedia codec, a specific caller, a caller group, and a call time zone.

Web server 126 according to a preferred embodiment of the present invention is connected to the sound source providing server 116 or the sound source providing control server 120 through the Internet network 118, the sound source to be stored in the sound source providing server 116 It provides a wired or wireless web page for adding or changing the sound source providing control server 120 to change the information for specifying the sound source and the corresponding ringback tone sound source code. The information for specifying the sound source may be specific caller information, caller group information, or call time zone.

2 is a conceptual diagram briefly illustrating a process of providing a multimedia ringback tone service according to an exemplary embodiment of the present invention.

A call origination request from the calling mobile terminal 100 having the multimedia codec to the base station transmitter 102 / base station controller 104 is requested (S200). The base station transmitter 102 / base station controller 104 transmits a call origination request to the calling mobile communication switching station 106 (S202). The calling mobile communication switching station 106 makes a call connection request to the called mobile communication switching station 112 (S204). In addition, the ringback tone service request is transmitted to the sound source providing server 116 (S206).

As described above, the sound source providing server 116 stores the ringback tone source to match the multimedia codec used in the calling mobile terminal 100, and the called mobile communication switching station 112 and the calling mobile communication switching station ( The ringback tone source is transmitted to the calling mobile terminal 100 through step 106 (S208).

At this time, the vocoder located in the calling base station controller 104 cannot support the multimedia codec, and the ringback tone sound source transmitted from the sound source providing server 116 is already encoded sound source, thereby bypassing it.

The calling mobile terminal 100 reproduces the received ringback tone sound source using a multimedia codec. Then, when a call is made by the called mobile terminal (not shown) (S210), the called mobile communication switching station 112 notifies the caller of the call to the calling party, and at the same time, the ringback tone to the sound source providing server 116. Request release (S212). The calling mobile communication switching station 106 receiving the incoming call signal from the called mobile communication switching station 112 controls the vocoder of the base station controller 104 and the voice codec of the calling mobile communication terminal 100 to make a voice call. (214).

3A and 3B are detailed views illustrating a process of providing a multimedia ringback tone service according to an exemplary embodiment of the present invention.

When the calling mobile communication terminal 100 attempts to connect a call to a called mobile communication terminal (not shown), the calling mobile communication switching station 106 assigns a radio resource to the base station controller 104 along with channel allocation and vocoder allocation. Perform (S300).

When the calling party wireless call setup is completed, the calling party mobile communication switching center 106 requests the home location register 110 for location information of the called party mobile communication terminal (not shown) (S302). The home location register 110 requests routing information from the called mobile communication switching center 112 where the called mobile terminal (not shown) is located, and the called mobile communication switching center 112 responds to the home location register 110. The message is transmitted (S304). In addition, the home location register 110 performs a location information response of the called-party mobile communication terminal (not shown) to the calling-side mobile communication switching center 106 (S306). At this time, the source mobile communication switching center 106 also receives information on a plurality of multimedia codecs supported by the source mobile communication terminal 100.

The calling mobile communication switching station 106 transmits an ISUP call connection request message to the called mobile communication switching station 112 to notify that there is a call request for the called mobile communication terminal (not shown) using the IAM message ( S308). Here, the ISUP call connection request message includes information on a plurality of multimedia codecs supported by the calling mobile terminal 100.

The destination mobile communication switching center 112 detects whether the destination mobile communication terminal (not shown) subscribes to the ringback tone service, and uses the routing data to ring the source mobile communication terminal 100 to the sound source providing server 116. In operation S310, an ISUP call connection request message including a plurality of multimedia codec information for a backtone service is transmitted. The called-side mobile communication switching center 112 notifies the called-side mobile communication terminal (not shown) by performing paging of the called-side mobile communication terminal (not shown) (S311).

Meanwhile, the sound source providing server 116 requests the subscriber's ringback tone setting sound source to the sound source providing control server 120, and the sound source providing control server 120 transmits the sound source code set by the called subscriber to the sound source providing server 116. (S312). In this case, when the sound source request request from the sound source providing server 116 includes multimedia codec information, the sound source providing control server 120 notifies the sound source code corresponding to the corresponding codec, and when not included, the ringback tone sound source for the voice codec Notify the code.

The destination mobile communication switching center 112 transmits a codec setting request, which is a control message just for passing the EVRC vocoder of the calling base station controller 104, to the calling mobile communication switching center 106 (S314). Upon receiving the codec setting request, the calling mobile communication switching station 106 requests the base station controller 104 to enable ringback tone through the multimedia codec, receives a response, and then activates a routing path for the ringback tone ( S316, S318).

The ringback tone sound source is controlled by the destination providing mobile station (116) until the incoming call is made by the called party's mobile terminal (not shown). Through the 104 and the base station transmitter 102 is transmitted to the calling mobile terminal 100 (S320).

The calling mobile terminal 100 reproduces the ringback tone sound source by activating a codec suitable for the transmitted ringback tone sound source (322). An internal configuration of the calling mobile terminal 100 according to the preferred embodiment of the present invention will be described in detail with reference to FIG. 4.

When a call is received by the called party's mobile terminal (not shown), the called party's mobile switching center 112 receives a call signal indicating that the call has been received. When necessary, a codec setting change request signal is requested to the calling mobile communication switching center 106 (S324, S326, S328) to enable the codec operation. Then, the ringback tone service is terminated by releasing the ISUP call connection with the sound source providing server 116 (S330). On the other hand, when the calling party mobile communication switching station 106 receives such a codec setting change request signal, a normal call is made possible by requesting an EVRC vocoder setting change located in the base station controller 104 (S332).

4 is a block diagram schematically illustrating an internal configuration of a mobile communication terminal according to an exemplary 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 400, a channel decoder 410, a signal processor 420, a call control module 430, and an enhanced variable rate coder (EVRC) codec. 440, the multimedia codec unit 450, and the like.

The RF signal processor 400 converts a wireless signal received through an antenna (not shown) into a digital signal. The channel decoder 410 decodes the digital signal received by the RF signal processor 400, separates the signal portion of the digital signal from the data portion of the ringback tone sound source, and transmits the signal portion to the signal processor 420. The data portion is sent to the call control module 430.

The call control module 430 transmits the data of the ringback tone source transmitted from the channel decoder 410 to the EVRC codec 440 or the multimedia codec 450 that is composed of a plurality of multimedia codecs. Determine whether to send. The call control module 430 will be described in detail with reference to FIGS. 6 and 7 in the transmission path setting and the multimedia codec of the ring back tone sound source.

The EVRC codec 440 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 compressed data into a voice. Is raised to Personal Communication Services (PCS) level. The EVRC codec 440 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 440 may greatly improve sound quality by minimizing noise except for a human voice when making a call in a noisy area. The EVRC codec 440 according to the preferred embodiment of the present invention transmits by the call control module 430 when the callback is terminated by the called party's mobile terminal (not shown) to terminate the ringback tone service and perform a voice call. Voice data will be received.

The multimedia codec unit 450 includes a plurality of multimedia codecs for reproducing a multimedia ringback tone sound source so as to receive a high quality music service through a voice call channel of a mobile communication system. Here, examples of the multimedia codec may be AAC (Advanced Audio Coding), AAC +, Enhanced AAC +, AMR-WB, AMR-WB + codec.

5 is a flowchart illustrating a process for distinguishing between an EVRC codec and a multimedia codec of a call control module according to an exemplary embodiment of the present invention.

The multimedia ring back tone sound source transmitted from the sound source providing server 116 is received by the RF signal processor 400 of the calling mobile terminal 100 and converted into a digital signal (S500). The digital signal converted by the RF signal processor 400 is decoded by the channel decoder 410 to separate the signal portion of the digital signal and the data portion of the ringback tone source, and transmit the signal portion to the signal processor 420. The data portion is transmitted to a buffer (not shown) at a period of 20 ms (S505).

The call control module 430 analyzes information of the first byte by receiving data of a 20 ms period transmitted to the buffer (S510). The upper 3 bits of the first byte are analyzed to determine the data of the buffer (not shown) as the data of the multimedia codec or the data of the EVRC codec 440 (S515).

If the information of the upper 3 bits is '110' or '111' which is not used in the data encoded by the EVRC codec 440, it is determined by the multimedia codec and counted A (S520). 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' (S525). 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 440 and counted B. If not, the data of the buffer is determined as the data of the multimedia codec. A counts (S530). Here, the A count means that the entire data of the ringback tone sound source is analyzed by a plurality of buffers (not shown) storing data at 20 ms periods, and determined by the multimedia codec data, and the B count means the EVRC codec ( It is determined by the data of 440 and accumulated.

The sum of the A count and the B count is analyzed to determine whether the result is 10 or more or less (S535). 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 description, a criterion for setting a suitable criterion for data of a ringback tone sound source may be set in practice.

If the sum of the A count and the B count is less than or equal to 10, the processing for distinguishing between the voice codec and the audio codec of the call control module is repeated. (S540). If the A count is smaller than the B count, the received data is transmitted to the EVRC codec 440 (S545). If the A count is greater than the B count, the received data is determined as a multimedia ringback tone and transmitted to the multimedia codec unit 450 (S550).

6 is a view showing a method for analyzing data in a mobile communication terminal according to an embodiment of the present invention.

6a shows a buffer that stores data of 20 ms periods. If 171 bits of data are stored in a 1-byte buffer for 20 ms, the block of buffer that stores 20 ms of 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 430 to distinguish between the EVRC codec and the multimedia codec. In addition, by repeating the process of distinguishing the voice codec and the multimedia codec of the data stored in the buffer every 20 ms, the error of delivering the multimedia ringback tone sound source to the EVRC codec 440 does not occur. 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.

6b is a block diagram of the information of the first byte in units of bits. If the upper 3 bits are '110' or '111', the call control module 430 determines the data of the buffer as the data of the multimedia codec.

6c shows the next three bits of information. If the next three bits are '000' while the upper three bits are not '110' or '111', the call control module 430 determines the data of the buffer as the data of the EVRC codec 440. Is determined as the data of the multimedia codec.

7 is a diagram illustrating a method for additional transmission of information bits for identification of a multimedia codec according to a preferred embodiment of the present invention.

7a illustrates a conventional 20 ms data format. The data format of the conventional 20 ms period transmitted to the mobile communication terminal is transmitted as 168 bits of payload and 3 bits of dummy data among 171 bits of data.

7b illustrates a data format for identification of a multimedia codec according to a preferred embodiment of the present invention.

In the multimedia codec identification according to the preferred embodiment of the present invention, in order to identify a codec suitable for the multimedia ringback tone among a plurality of multimedia codecs of the multimedia codec unit 450 through the process of FIG. Use it. The call control module 430 of the calling mobile terminal 100 includes an algorithm for identifying the type of multimedia codec by analyzing information bits of meaningless data for identifying the multimedia codec. By analyzing the meaningless data of the multimedia ringback tone source received from the channel decoder 410, the multimedia codec type is identified and the multimedia ringback tone source is transmitted to a suitable multimedia codec among a plurality of multimedia codecs of the multimedia codec unit 450.

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, a multimedia codec for high quality music can be operated during a ringback tone period by utilizing various kinds of multimedia codecs in a ringback tone service, and a voice codec such as EVRC can be operated during a voice call. By presenting the plan, it is effective to provide high quality ringback tone service. In addition, according to the present invention, a high quality ringback tone service can be provided to a calling mobile terminal supporting a multimedia codec without changing a vocoder in a network equipment of a mobile communication system.

In addition, the quality of the ringback tone service that is currently in service can be improved from the mobile operator's point of view, thereby generating new revenue in terms of additional charges for the improved service, and improving customer satisfaction with the mobile communication service. have.

Claims (24)

When the calling subscriber calls the called subscriber by using a Home Location Register (HLR) that stores profile information including whether the subscriber subscribes to the ringback tone service and a music providing server that stores the ringback tone sound source, A method for providing a multimedia ringback tone service in a multimedia ringback tone system to allow the called subscriber to play the ringback tone sound source previously set in the sound source providing server by a calling mobile terminal. (a) when the calling mobile communication terminal attempts to connect a call to the called mobile communication terminal, the calling mobile communication exchange station transmits the location information of the called mobile communication terminal from the home location register and the called mobile communication terminal. Receiving whether to subscribe to the ringback tone service and a plurality of multimedia codec information supported by the calling mobile terminal; (b) if the called-party mobile communication terminal is subscribed to the ringback tone service, sends an ISUP (ISDN User Part) call connection request message including the plurality of multimedia codec information to the called-party mobile communication switching center, and the called-party The mobile communication switching center transmitting the ISUP call connection request message to the sound source providing server; (c) when the calling mobile communication exchange receives the codec setting request message from the called mobile communication switching station, the calling mobile communication switching station transmits the codec setting request message to the calling base station controller to provide the ringback tone service. Activating a routing path for the network; And (d) receiving the ringback tone sound source selected using the plurality of multimedia codec information from the sound source providing server and transmitting the ringback tone sound source to the calling mobile terminal; Including The sound source providing server generates a sound code request signal including the plurality of multimedia codec information, the called-party mobile communication terminal identification information, the calling-party mobile communication terminal identification information, and the call request time zone information, and transmits it to a sound source providing control server. The sound source providing control server transmits a sound source code including the multimedia codec suitable for the sound source code request signal to the sound source providing server, and transmits the ringback tone sound source encoded by the sound source providing server to the multimedia codec to the called party's mobile communication. A method for providing a multimedia ringback tone service, characterized in that for transmitting to the calling mobile communication switching center via an exchange. The method of claim 1, And the calling mobile terminal receives the ringback tone service through a voice call channel by supporting the multimedia codec other than an enhanced variable rate coder (EVRC) codec for a voice call. The method of claim 2, The multimedia codec includes an advanced audio coding (AAC), an AAC +, an enhanced AAC +, an adaptive multi-rate (AMR), an AMR-WB, and an AMR-WB + codec. The method of claim 1, And the home location register sets and stores the information of the plurality of multimedia codecs supported by the calling mobile terminal as additional service subscription information of the calling subscriber profile. The method of claim 1, And a calling ring mobile communication switching center storing information on whether to subscribe to the ring back tone service and routing information to the sound source providing server by communicating with the home location register. How to give. delete The method of claim 1, wherein in step (c) When the calling party's controller requests the setting of the multimedia codec from the calling party's base station controller, the calling party's base station controller bypasses the ringback tone sound source encoded by the multimedia codec without encoding. How to provide multimedia ringback tone service. The method of claim 1, And the ringback tone sound source is encoded and stored according to the type of the multimedia codec applicable to the mobile communication terminal of the subscriber. delete delete When the calling subscriber calls the called subscriber by using a Home Location Register (HLR) that stores profile information including whether the subscriber subscribes to the ringback tone service and a music providing server that stores the ringback tone sound source, In the system for providing a multimedia ringback tone service to the ringback tone sound source preset by the called subscriber in the sound source providing server to be played by the calling party mobile terminal, When the calling mobile communication terminal attempts to connect to the called mobile communication terminal, it receives an ISUP (ISDN User Part) call connection request message including a plurality of multimedia codec information from the calling mobile communication switching center and transmits it to the sound source providing server. Transmits, requests the calling mobile communication switching center to set a multimedia codec, activates a routing path for the ringback tone service, receives the ringback tone sound source convertible to the multimedia codec from the sound source providing server, and moves the calling party Recipient's mobile telecommunication switching center transmitting to telecommunication switching center System for providing a multimedia ring back tone service comprising a. delete When the calling subscriber calls the called subscriber by using a Home Location Register (HLR) that stores profile information including whether the subscriber subscribes to the ringback tone service and a music providing server that stores the ringback tone sound source, In the mobile communication terminal for a multimedia ringback tone service to allow the called subscriber to play the ringback tone source previously set in the sound source providing server to the calling mobile terminal, A call control module that controls to change the path of the ringback tone source data from an enhanced variable rate coder (EVRC) codec to a multimedia codec when receiving data of the ringback tone sound source including a plurality of multimedia codec information; And When the path of the ringback tone sound source data is changed to the multimedia codec under the control of the call control module, the multimedia codec unit decodes the data of the ringback tone sound source received through a communication network through a multimedia codec. Terminal for a multimedia ring back tone service comprising a. The method of claim 13, The call control module is a terminal for a multimedia ringback tone service, characterized in that for storing the data of the ringback tone sound source in a buffer 20 ms cycles. The method of claim 13, The call control module includes an algorithm for identifying the type of the multimedia codec by analyzing information bits of the meaningless data of the ringback tone sound source to identify the multimedia codec from the data of the ringback tone sound source. Terminal for multimedia ringback tone service. The method of claim 13, The multimedia codec unit includes a plurality of multimedia codecs including Advanced Audio Coding (AAC), AAC +, Enhanced AAC +, Adaptive Multi-Rate (AMR), AMR-WB, and AMR-WB + codecs to reproduce the ringback tone sound source. Terminal for a multimedia ringback tone service, characterized in that. A call control module and a call control module that control to change the path of the ringback tone sound source data from an enhanced variable rate coder (EVRC) codec to a multimedia codec when receiving ringback tone sound data of a ringback tone sound source including a plurality of multimedia codec information. When the path of the ringback tone sound source data is changed to the multimedia codec according to the control of the, the ringback tone at the calling mobile terminal comprising a multimedia codec unit for decoding the ringback tone sound data received through a communication network through a multimedia codec In the mobile communication terminal control method for reproducing sound source data, (a) receiving, at the call control module, data of the ringback tone sound source including the plurality of multimedia codec information from a calling mobile communication switching center; (b) analyzing the received ringback tone sound source data to determine data of the ringback tone sound source as data of the EVRC codec or data of the multimedia codec; (c) transmitting, by the multimedia codec unit, the ringback tone sound source data to the multimedia codec suitable for the ringback tone sound source; And (d) decoding and playing the ringback tone source through the appropriate multimedia codec; To include, in the step (b) The call control module is a terminal control method for a multimedia ringback tone service, characterized in that for analyzing the first byte (Byte) of the ringback tone sound source data stored in a buffer at regular intervals. The method of claim 17, And storing the data of the ringback tone sound source in a buffer every 20 ms in the call control module of the calling mobile terminal. 18. The process according to claim 17, wherein in step (b) The predetermined period is 20 ms terminal control method for a multimedia ringback tone service. The method of claim 17, And analyzing the upper three bits (Bit) of the first byte to determine the data of the buffer as the data of the multimedia codec or the data of the EVRC codec. The method of claim 20, Analyze the upper 3 bits of the first byte to determine the data of the EVRC codec, and analyze the next 3 bits of the upper 3 bits of the first byte to determine the data of the buffer if the next 3 bits is '000'. Terminal control method for a multimedia ringback tone service, characterized in that determined by the data of. 18. The process according to claim 17, wherein in step (b) Multimedia ringback tone service, characterized in that the plurality of buffers for storing data at regular intervals so as not to cause a determination error to repeat the step (b) and to compare the ringback tone source data to a codec that is determined a lot Terminal control method for. 18. The process of claim 17, wherein in step (c) The ringback tone sound source data is a terminal control method for a multimedia ringback tone service, characterized in that 3 bits of dummy data are used as information bits for identifying a plurality of types of multimedia codecs in a period of data. 18. The process of claim 17, wherein in step (c) And the call control module includes an algorithm for analyzing information bits of the 3 bits of meaningless data to identify the type of the appropriate multimedia codec.

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