TWI387960B - Method and system of ring back tone service using multimedia codec - Google Patents

Description

Call answering service method and system using multimedia codec

The present invention relates to a method of processing and transmitting a sound source capable of efficiently transmitting a sound source from a sound source providing unit to a mobile switching center providing an incoming call ring by means of a multimedia codec.

Most mobile terminals use a voice codec with variable transmission ratio, such as EVRC (Enhanced Variable Rate Coding), for wireless channel optimization and improved voice call efficiency. These speech codecs maximize channel efficiency by checking pronunciation, quieting intervals, generating and mapping appropriate codebooks.

However, speech codecs with variable transmission rates (e.g., EVRC, Enhanced Variable Rate Coding) reduce the quality of the music because of the variable transmission ratio coding error when providing music services that are not at all silent intervals. To solve this problem, a method that minimizes the damage caused by the speech codec to the sound source is employed, and the sound source is accordingly retrieved and corrected by the instant music provider to suit the EVRC codec. This source correction depends on the pre-processing of the EVRC codec features and the sound engineer's process. These operations can compensate for the quality of music services through the EVRC codec, which corresponds to voice quality, but it is difficult to significantly improve the quality of music services.

To overcome this problem, a method for downloading one of the services' multimedia codecs is employed, but additional independent development is required to implement the methods in the voice call channel. In addition, since it is necessary to change the function of the traditional mobile terminal network to apply the methods to the mobile terminal network service, it is desirable to minimize the modification of the universal mobile terminal network while providing its services.

Correspondingly, it is preferable to enable a mobile terminal to process an incoming call answering interval by implementing a decoding function of the multimedia audio codec, and at the same time The voice encoder bypass function used in making a voice call between mobile terminals can be used to transmit data from a source providing server to a mobile terminal to minimize node modifications to the mobile terminal network.

Accordingly, it is an object of the present invention to provide a method of processing and transmitting a sound source capable of utilizing a voice encoder bypass function of a mobile communication network to efficiently store a sound source server and a multimedia audio The sound source encoded by the decoder is sent to a mobile terminal.

It is necessary to modify the device of the mobile terminal system having a low data transmission rate in the voice call channel to provide high quality music service by utilizing the multimedia audio codec in the mobile communication network. It is possible to gradually improve the functionality of the mobile terminal by replacing it with a new terminal or S/W upgrade, but it should be consistent with traditional related services to minimize improvements in the mobile terminal system.

In addition, another object of the present invention is to provide a sound source preprocessing method which considers sound source transmission to provide an incoming call answering service to a transmitting terminal supporting a multimedia codec without changing the network of mobile terminals. A speech encoder in a road device.

The sound source providing server for the call answering service is provided by the multimedia codec, and the sound source information is preferably stored, so that the same information to be provided is sent to the sending user of the service environment, and the same information is effectively transmitted. Correspondingly, the voice encoders of all the codecs used in the instant music service may be installed in the base station controller or the mobile switching center of the mobile terminal system to achieve the purpose, but considering the system change requirements and the instant This method is economically inefficient when operated. Therefore, it is preferable that the sound source providing server stores a sound source encoded by the S/W codec, bypasses the voice encoder of the mobile terminal, and then transmits the same sound source to the user when the service terminal issues a service request. terminal.

Accordingly, a first aspect of the present invention is to provide an incoming call answering service. The method comprises the steps of: (a) transmitting a call sending request signal to a mobile switching center by a transmitting terminal having a codec; (b) the mobile switching center responding to the calling request signal and answering the incoming call The ringing service device transmits an incoming call answering service request signal; (c) the incoming call answering service device processes the sound source data provided by the sound source data providing unit, so that the sound source data is suitable for the editing used in the transmitting terminal a decoder, which then transmits the sound source data to the transmitting terminal; (d) a voice encoder of the mobile switching center or controller bypasses the processed sound source to the transmitting terminal; (e) the transmitting terminal The processed sound source data is reproduced by the codec.

Preferably, the codec is a multimedia codec. More preferably, the method further comprises the step (f): the mobile switching center transmits an incoming call cancellation request signal to the incoming call answering service device when the terminating terminal cancels the call.

In addition, step (c) is performed by the incoming call answering service device to encode the sound source data into multimedia sound source data. Preferably, the incoming call answering service device encodes the sound source data through an encoder of a multimedia codec implemented in software or hardware. More preferably, the incoming call answering service device reconstructs the encoded sound source data into a bypass frame unit.

According to a second aspect of the present invention, a call answering service method is provided, which includes the following steps: (A) the incoming call answering service device processes sound source data provided by a sound source providing unit to make the sound source data suitable a codec used in the transmitting terminal, and then transmitting the sound source data to the transmitting terminal; (B) transmitting a call sending request to the mobile switching center by using a transmitting terminal having a codec (C) the incoming call answering service device responds to the call request signal from the mobile switching center, and transmits the processed sound source data to the transmitting terminal; (D) the voice exchange of the mobile switching center or controller The source data is bypassed to the transmitting terminal; (E) the transmitting terminal reproduces the processed sound source data through the codec.

According to a third aspect of the present invention, an incoming call answering service system is provided The system includes: a signaling terminal having a codec for transmitting a call requesting signal to the mobile switching center; and a mobile switching center for responding to the call requesting signal to the incoming call answering service device Transmitting an incoming call answering service request signal; an incoming call answering service device for processing the sound source data provided by the sound source data providing unit, so that the sound source data is suitable for the codec used in the transmitting terminal, and then The sound source data is transmitted to the sending terminal; the voice encoder of the controller or the mobile switching center is used to bypass the processed sound source to the transmitting terminal.

Preferred embodiments in accordance with the present invention are described below in conjunction with the accompanying drawings. Herein, when an element is connected to another element, the element may be directly connected to the other element, or may be indirectly connected to the other element via another element. In addition, irrelevant elements are omitted for clarity. In addition, the same component symbols always refer to the same components. Detailed and improved items in accordance with the present invention are disclosed in the dependent claims.

1 is a block diagram showing an incoming call answering service system. A home location recorder 100 has information corresponding to the user and communicates with the mobile switching center (O_MSC 102, T_MSC 103) via the No. 7 network 101 based on the STP. The mobile switching centers 102 and 103 are connected to the sound source providing unit 105 that stores the sound source through a gateway 104. In addition, mobile switching centers 102 and 103 are coupled to base station controller 106 to support access to mobile terminal communications. The base station controller 106 communicates with a user terminal via a base station transceiver system 107 and functions in a control voice coder that corresponds to a resource assignment and voice call channel. The sound source providing unit 105 is connected to the user DB 109 and the sound source providing unit control server 110 through the outline path 108.

The home location recorder 100 has all the functions as a conventional network component, and has a storage function for storing information on whether or not the incoming call is replaced and information for performing routing to the sound source providing unit 105. It also includes the codec information that the messaging terminal wants to use for the incoming call ringing service. The additional codec information is pre-set and stored as additional service specific information for the end user scheme.

The mobile switching centers 102 and 103 have all the functions as a conventional network component, and have a storage function for storing information indicating whether or not the incoming call is replaced, and information for performing routing to the sound source providing unit 105, while recording the terminal. The user's location communicates with the home location recorder 100; in addition, it has the following functions: upon receiving a call connection request to the terminal user, information based on whether the incoming call is answered or not, and for performing routing to the sound source providing unit 105 The information is received from the sound source providing unit 105 to provide an incoming call answering, and then the received sound source is provided to the corresponding transmitting user. Here, the dispatching mobile switching centers 102 and 103 communicate with the home location recorder 100, receive codec information for calling ringback from the transmitting terminal, and must provide a codec for the sound source providing unit 105. Information, the user wishes to use this information in the call ringing service through the terminal mobile switching centers 102 and 103.

The sound source providing unit 105 stores various sound sources to be suitable for all kinds of codecs that a user terminal can use in an incoming call ringing, characterized in that it is connected to the mobile switching centers 102 and 103 through the gateway 104, thereby A sound source corresponding to the type of codec requested by the mobile switching centers 102 and 103 is provided.

The sound source providing control server 110 has a function of communicating with the sound source providing unit 105 via the Internet 108 to transmit a corresponding sound source to the mobile switching centers 102 and 103 according to the codec information of the requested incoming ringing service. Adding the call answering type that the sound source providing unit 105 must provide to the mobile switching centers 102 and 103 to the functions provided in the conventional incoming call answering service, such as the identification information of the terminal user required to connect the call, corresponding The identification information of the sending user and/or the time slot information when requesting a call connection.

The website server 112 is connected to the sound source providing unit 105 or the sound source providing control server 110 via the Internet 108 to add the stored sound source to the sound source providing unit 105, or to change the sound source providing control server 110. Specify the information needed for a source (specific senders, groups, call slots, etc.) and the corresponding source code. This addition and change function can be implemented by the user via a web page or using a wireless internet service screen of the mobile terminal provided by the web server 112.

The present invention presupposes the fact that the call answering service for supporting the multimedia codec according to the present invention can be used by using a multimedia codec other than the EVRC codec (i.e., AAC codec). The mobile terminal provides music service to the voice call channel. Furthermore, the exemplary embodiments described must also assume the fact that the base station controller 106 or the mobile switching centers 102 and 103 of the mobile terminal do not spontaneously use the H/W or S/W to provide the multimedia codec.

2 is a flow chart illustrating a call answering service using a multimedia codec. If a transmitting terminal having a multimedia codec requests a call to be sent, an incoming call answering service request signal is transmitted to the incoming call answering service device 205 by the mobile switching centers 203 and 204 where the terminal user is located. The incoming call answering service 205 stores and processes a sound source to adapt the sound source data to the multimedia codec used in the transmitting terminal 201. Here, the speech encoder of the base station controller 202 or the mobile switching centers 203 and 204 does not support multimedia due to the voice encoder used for the conventional voice call. Accordingly, the sound source previously encoded as the multimedia codec in the incoming call answering service device 205 is transmitted to the mobile terminal network, and the voice encoder or mobile switching center 203 and 204 of the base station controller 202 the sound source Bypass to the user terminal. The user terminal 201 replaces the speech codec through a multimedia codec to reproduce the sound source of the terminal. Then, the terminal mobile switching center notices the termination of the call to the transmitting portion, and requests the incoming call answering service device 205 to cancel the incoming call answering service.

Figure 3 is a block diagram illustrating the transmission of sound sources in a conventional incoming call answering service. In order to implement the above-described sound source processing method, the incoming call answering service device 303 must encode a sound source to be used at the mobile terminal 301 to make it suitable for the multimedia codec. Since the conventional incoming call answering service uses the voice encoder 302 in the mobile terminal, the incoming call answering service device 303 simply stores the PCM type sound source data supplied from the content provider 304. However, since the voice encoder 302 of the mobile terminal cannot be used for the incoming call answering service using the multimedia codec, the incoming call answering service device 303 or the content provider 304 must directly perform encoding of the sound source. Furthermore, since the voice encoder bypass function of the mobile terminal system used in the voice call in the mobile terminal must be used, the incoming call answering service device 303 must adjust the data format when transmitting the data to the mobile terminal system.

Figure 4 illustrates a block diagram of sound source transmission in a multimedia call answering service. As shown in FIG. 4, the incoming call answering service device 403 must receive the PCM sound source data from the content provider 404, and generate the sound source data for the multimedia codec from the sound source data through the multimedia decoder, and generate a special format that can be transmitted. .

There are two ways to store sound sources in an incoming call answering service. First, if the incoming call answering service device includes an instant multimedia encoder, the incoming call answering service device stores the sound source as a PCM type, and then the sound source can be immediately transmitted in the presence of a mobile terminal system request. In addition, the incoming call answering service device includes a non-instantaneous multimedia codec, and the incoming call answering service device converts the sound source into a multimedia codec format instead of a PCM type, and stores it, and then, in the presence of a mobile terminal request , the stored sound source is transmitted without separate encoding.

Figure 5 is a view showing the construction of a bypass frame. It is desirable to transmit the sound source data whose encoding is suitable for the multimedia codec to perform the voice encoder bypass function in the mobile terminal system. In order to perform the method, the source material must be transmitted in the frame format described. a message header to store Voice encoder type and frame number. An encoded packet includes a data transmission rate, a packet data, and dummy information. The data transmission rate must be transmitted at full rate, and the 17-bit data information and the 101-bit dummy information are simultaneously transmitted.

Figure 6 illustrates a flow diagram for processing a sound source in an incoming call answering service device having an instant multimedia codec. The incoming call answering service device stores the PCM sound source received from the content provider. The incoming call answering service device searches for the corresponding sound source, and then encodes the sound source using a multimedia codec in the case of receiving an incoming call answering service request from a mobile terminal system. The sound source encoded as a multimedia frame unit is reconstructed into a frame for bypass mode processing. Here, the sound source data is divided into 171-bit units, additional information is added thereto, and then the data is transmitted to the mobile terminal system at intervals of 20 milliseconds.

Figure 7 illustrates a flow diagram for processing a sound source in an incoming call answering service device having a non-instant multimedia codec. The difference between FIG. 6 and FIG. 7 is that multimedia encoding is performed on a PCM source, converted into a frame for bypass mode processing, and stored. The incoming call answering service device searches for the corresponding sound source, and then transmits the sound source to a mobile terminal system at intervals of 20 milliseconds when receiving the incoming call answering service request from the mobile terminal system.

As described above, the present invention can improve the quality of the incoming call answering service, minimize the modification of the shared mobile terminal network, and provide an incoming call answering service with improved quality.

While some embodiments of the present invention have been shown and described, it is understood by those skilled in the art that the invention may be modified without departing from the spirit and scope of the invention. The scope and its equivalent content are limited.

100‧‧‧Home location recorder

101‧‧‧No. 7 Network

102‧‧‧O_MSC

103‧‧‧T_MSC

104‧‧‧Chute

105‧‧‧Source supply unit

106‧‧‧Base station controller

107‧‧‧Base Station Transceiver System

108‧‧‧

109‧‧‧User DB

110‧‧‧Source supply unit control server

111‧‧‧Chute

112‧‧‧Web server

201‧‧‧Message terminal

202‧‧‧Base station controller

203‧‧‧O_MSC

204‧‧‧T_MSC

205‧‧‧Call ringing service device

301‧‧‧ mobile terminal

302‧‧‧Voice encoder

303‧‧‧Call ringing service device

304‧‧‧Content Provider

401‧‧‧ mobile terminal

402‧‧‧Mobile Terminal Speech Encoder

403‧‧‧Call ringing service device

404‧‧‧Content Provider

The above and/or other advantages of the present invention will become apparent and appreciated from the <RTIgt;

1 is a block diagram showing an incoming call answering service system.

2 is a flow chart illustrating a call answering service using a multimedia codec.

Figure 3 is a block diagram illustrating the transmission of sound sources in a conventional incoming call answering service.

Figure 4 is a block diagram showing the sound source transmission in the multimedia call answering service.

Figure 5 is a view showing the construction of a bypass frame.

Figure 6 illustrates a flow diagram of sound source processing in an incoming call answering service device having an instant multimedia codec.

Figure 7 illustrates a flow diagram of sound source processing in an incoming call answering service device having a non-instantaneous multimedia codec.

The above examples are given for illustrative purposes only and are not intended to limit the scope of the invention.

201‧‧‧Message terminal

202‧‧‧Base station controller

203‧‧‧O_MSC

204‧‧‧T_MSC

205‧‧‧Call ringing service device

Claims (14)

An incoming call answering service method, comprising the steps of: (a) transmitting a call origination request signal from a signaling terminal having a codec to a mobile switching center; (b) the mobile switching center responds to a call. Requesting a signal to transmit an incoming call answering service request signal to an incoming call answering service device; (c) the incoming call answering service device processes the sound source data provided by a sound source data providing unit to make the sound source data suitable for the The codec used in the transmitting terminal, and then transmitting the same data to the transmitting terminal; (d) the voice encoder or controller of the mobile switching center bypasses the processed sound source data to the transmitting terminal (e) the transmitting terminal reproduces the processed sound source data through the codec; and (f) when the terminating terminal cancels the call, the mobile switching center transmits an incoming call to the incoming call answering service device The bell cancels the request signal. The call answering service method according to claim 1, wherein the codec is a multimedia codec. The call answering service method according to claim 1 or 2, wherein the step (c) is performed by the incoming call answering service device, and the device encodes the sound source data into a multimedia sound source material. The call answering service method according to claim 3, wherein the incoming call answering service device encodes the sound source data through an encoder of a multimedia codec implemented by software or hardware. For example, the call answering service method described in claim 3, wherein the incoming call answering service device reconstructs the encoded sound source data into a bypass frame unit. The call answering service method according to claim 5, wherein the bypass frame unit is reconstructed into an input having the encoded frame. Millisecond unit frame. The call answering service method according to claim 1, wherein the sound source data providing unit of the step (c) processes the sound source data. An incoming call answering service method includes the following steps: (A) the incoming call answering service device processes the sound source data provided by a sound source data providing unit, so that the sound source data is suitable for use in the calling terminal a decoder, and then transmitting the same data to the transmitting terminal; (B) transmitting a call sending request signal from a transmitting terminal having a codec to a mobile switching center; (C) the incoming call answering service device Responding to the call origination request signal from the mobile switching center, and transmitting the processed sound source data to the transmitting terminal; (D) one of the mobile switching centers of the voice encoder or controller next to the sound source data (E) the transmitting terminal reproduces the processed sound source data through the codec; and (F) the mobile switching center answers the incoming call when the terminal terminates the call cancellation The device transmits an incoming call answering cancellation request signal. The call answering service method according to claim 8, wherein the codec is a multimedia codec. The call answering service method according to claim 8 or 9, wherein the step (A) is performed by the incoming call answering service device, and the sound source data is encoded into a multimedia sound source data. The call answering service method according to claim 10, wherein the incoming call answering service device encodes the sound source data through an encoder of a multimedia codec implemented in software or hardware. The call answering service method according to claim 10, wherein the call answering service device reconstructs the encoded sound source data into A bypass frame unit. The call answering service method of claim 12, wherein the bypass frame unit is reconstructed into a 20 millisecond unit frame having an input of the encoded frame. The call answering service method according to claim 8, wherein the sound source data providing unit of the step (A) processes the sound source data.