KR20020044306A - System And Method For Multimedia Streaming Service In Mobile Internet - Google Patents

Abstract

The present invention provides a mobile terminal with a streaming service for a multimedia message that requires real-time or non-real-time streaming transmission such as video or audio through interworking of a MMSC and a Video On Demand (VOD) server in the wireless Internet. The present invention relates to a multimedia streaming service system and a method for providing a wireless streaming service in a wireless Internet. In the related art, a message in a packet form including a simple image such as a text, a still image, or a small video image clip is transmitted. Because it is limited to multimedia message processing, it cannot provide various multimedia conversion and transmission services.

Accordingly, the present invention provides a multimedia streaming service of various media types to a mobile terminal through redirection with a VOD server in which an MMSC providing a wireless Internet multimedia message service actually stores a multimedia message, thereby delivering a video message or a movie or voice. , Broadcasting, as well as video advertising using mobile multicasting is possible.

In addition, the present invention can be provided with a streaming service that immediately receives and plays a multimedia message in a mobile terminal through call signal conversion and transmission without notification of media conversion and message arrival using real-time call control through the SIP protocol.

Description

System and Method for Multimedia Streaming Service In Mobile Internet}

The present invention relates to a system and method for a multimedia streaming service in the wireless Internet. In particular, a mobile terminal provides a streaming service for a multimedia message requiring real-time or non-real-time streaming such as video or audio through interworking of an MMSC and a VOD server. The present invention relates to a multimedia streaming service system and a method for providing a wireless Internet.

The WAP 1.x standard was enacted under the initiative of the Wireless Application Protocol (WAP) Forum for wireless data services that can provide IP (Internet Protocol) access and Internet services without limitation. It plays a leading role in wireless data service.

However, the conventional WAP method is implemented to provide a service in a simple text format menu method optimized for a mobile terminal having a low transmission bandwidth and a specification, such as a short message service (SMS) method.

Therefore, in recent years, a multimedia message service (MMS) method capable of supporting a multimedia service to accommodate various media away from the text-based service described above has been provided. The MMS method receives an email or transmits an MMS through the Internet. Receives multimedia messages created from devices that support the WPX, and classifies them into respective MIME (Multipurpose Internet Mail Extensions) types, converts each classified media into a media format optimized for mobile device specifications, and stores them. When the message arrives, the receiver of the mobile terminal user can check the multimedia message by notifying the receiver of the message.

In addition, the above-mentioned MMS service is being standardized based on the WAP forum. The current MMS standard supports simple packet data such as a video image clip and text of a small amount that does not require still images and real-time transactions using existing e-mail. Consideration is given to only standardizing services.

However, in the future, the next generation mobile communication network capable of providing a high quality data service with a high transmission bandwidth is expected to increase user demand for various multimedia services, and thus, more advanced MMS service supplementation is required.

On the other hand, the MMS service structure for processing the above-described multimedia message is as shown in Figure 1, the e-mail server 11 for receiving a multimedia message in conjunction with a PC via the Internet, and retrieve the profile of the recipient by email An MMSC (MMS Center) 10 having a multimedia message processing unit 12 and a web server 13 for processing multimedia messages received by the server 11, and the web server 13 of the MMSC 10 move. It has a structure including a WAP gateway 20 to interlock to transmit a multimedia message to the terminal. In addition, the operator maintenance unit 14, which is not described, performs the message status, resource status, and system statistics functions processed by the multimedia message processor 12.

A conventional MMS service operation procedure having such a structure will be described in detail with reference to the flowchart of FIG. 2 and the MMS interface and protocol stack of FIG. 3.

First, an email server 11 of the MMSC 10, which interworks with the Internet according to the Transmission Control Protocol / Internet Protocol (TCP / IP) protocol, attaches a multimedia file from the sender's PC using the SMTP (Simple Mail Transfer Protocol) protocol. When receiving the received email (step S21), the multimedia message processing unit 12 refers to the recipient profile of the received email to optimize mail parsing and media (text, image, etc.) included in the mail to the receiver's mobile terminal. It converts as much as possible (step S22).

In this case, the profile includes information on the use of the mobile terminal, that is, whether MMS is supported, resolution, supported chromaticity, and memory capacity.

Subsequently, the multimedia message processing unit 12 notifies the mobile terminal of the receiver through the web server 13 and the WAP gateway 20 that a new multimedia message has been received using the HTTP (HyperText Transfer Protocol) protocol (step S23). In this case, the message notified to the receiver's mobile terminal includes Uniform Resource Identifier (URI) information in which newly arrived multimedia messages are stored, and a scheduling technique is applied to manage the message arrival notification. It is possible to make a reservation transmission method for delivering a multimedia message.

Accordingly, the mobile terminal receiving the arrival notification message of the new multimedia message first transmits a response message to the notification message to the MMSC 10 through the WAP gateway 20 (step S24), and then receives the newly arrived multimedia message. You can choose whether to reject, reject or delete.

If the newly arrived multimedia message is to be received, the MMSC 10 is approached using the URI of the multimedia message to be received by the 'GET' method of the HTTP protocol (steps S25 and S26). The multimedia message processing unit 12 of FIG. 10 encapsulates the multimedia message converted to the receiver profile according to the HTTP protocol and transmits the multimedia message to the receiver's mobile terminal through the web server 13 and the WAP gateway 20 (step S27). ).

On the contrary, when the multimedia message created by the mobile terminal is to be transmitted to the mobile terminal supporting the Internet or MMS service, the multimedia message created by the mobile terminal is received by the MMSC 10 through the WAP gateway 20, and thus, the MMSC. The multimedia message processing unit 12 of FIG. 10 may convert the multimedia message into an e-mail format or a multimedia message for transmission to the receiver's mobile terminal, and then transmit the multimedia message to the Internet or the receiver's mobile terminal.

In summary, the conventional multimedia message service described above is limited to the transmission of a message in the form of a packet containing a simple image, such as a text, a still image, or a small size of a video image clip, that is, a multimedia message in the form of an e-mail or an e-mail. There was a drawback in not being able to provide conversion and transfer services.

In particular, in recent years, the next generation mobile communication network (IMT-2000 (International Mobile Telecommunication), UMTS (Universal Mobile Telephone Service) environment requires high bandwidth and high quality packet data service to accommodate various multimedia services, but the conventional MMSC There was a drawback in not supporting this.

The present invention is to solve the problems described above, the object is,

According to the multimedia streaming service system and method in the wireless Internet according to the present invention, it is possible to provide a multimedia streaming service in a variety of media forms to the mobile terminal through a redirect to the VOD server that actually stores the multimedia message, the video message delivery In addition, movie, voice, broadcast, as well as video ads using mobile multicasting is possible.

In addition, the present invention can be provided with a streaming service that immediately receives and plays a multimedia message in a mobile terminal through call signal conversion and transmission without notification of media conversion and message arrival using real-time call control through the SIP protocol.

1 is a diagram illustrating a conventional MMS service structure for multimedia message processing.

2 is a flowchart illustrating a conventional MMS service operation procedure.

3 illustrates a conventional MMS interface and protocol stack.

4 is a diagram illustrating a configuration of a multimedia streaming service system through interworking of a MMSC and a VOD server in a wireless Internet according to the present invention.

5 is a flowchart illustrating a procedure of operating a multimedia streaming service for a mobile terminal in a wireless Internet according to the present invention.

6 illustrates an MMS interface and protocol stack in accordance with the present invention.

Explanation of symbols on the main parts of the drawings

40: MMSC 50: VOD Server

60: WAP gateway

A feature of the present invention for achieving the above object is a VOD server for transmitting in real time to the mobile terminal accessing the format-converted multimedia message in the HTTP 'GET' method using a real-time multimedia streaming control protocol; After converting the multimedia message received from the IP network or the e-mail server into a media format according to the receiver profile and storing it in the VOD server, the URI information of the VOD server is included and notified of the arrival of a new message to the receiver's mobile terminal. The present invention provides a multimedia streaming service system in the wireless Internet including an MMSC for providing a multimedia streaming service to a mobile terminal of the receiver through redirection with the VOD server.

Here, the real-time multimedia streaming control protocol, characterized in that any one of the RTP / RTCP protocol or RTSP protocol based on the user datagram protocol, the MMSC is interworking with the IP network according to the SIP protocol Call setup is performed to the receiver's mobile terminal to provide a streaming service for the received multimedia message.

Another feature of the present invention, the process of performing the media format conversion according to the profile of the receiver when the multimedia message is received through the IP network or email server; Storing the format-converted media in the VOD server and notifying the mobile terminal of the receiver of the arrival of a new multimedia message; When the MMSC is approached to receive the newly arrived multimedia message, it provides a multimedia streaming service method in the wireless Internet including providing a streaming service for the multimedia message through the MMS 'GET' method through a redirect with the VOD server. It is.

The multimedia streaming service method in the wireless Internet may further include receiving a multimedia streaming message through an interface using a real-time multimedia streaming control protocol based on a user datagram protocol between the IP network and the MMSC. It features.

In the process of performing the media format conversion, when the received multimedia message is a video, the media format is converted into H.263 or MPEG4 format media, and the media format is converted to media having a screen resolution and color supported by the receiver's mobile terminal. And converting the arrival of the new multimedia message to the receiver's mobile terminal, including the URI information of the VOD server storing the sender's address, media type, size and format of the converted media in the arrival notification message. And to notify.

Furthermore, the process of providing a streaming service for a multimedia message through redirection with the VOD server may include transmitting and receiving a message using a video / audio codec of a higher RTP / RTCP protocol, a lower UDP, and an IP protocol in the VOD server. It is possible to provide a streaming service for the multimedia message by enabling the dynamic transmission and playback of the multimedia message to the mobile terminal of the receiver.

On the other hand, the above-described multimedia streaming service method in the wireless Internet, the process of performing a call setup with the mobile terminal of the receiver using the SIP protocol when the multimedia message is received through the IP network or the email server; When the call is set up, after performing media conversion in real time through buffering, the method further includes providing a streaming service by transmitting and playing a multimedia message to the mobile terminal of the receiver using the RTP / RTCP protocol.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

System configuration for providing a multimedia streaming service to a mobile terminal through the interworking of the MMSC and the VOD server in the wireless Internet according to the present invention is shown in Figure 4, the MMSC 40 and VOD (Video On Demand) The server 50 has an interworking structure, which is not limited to processing only media that can be converted into the currently active e-mail format such as simple text and still images, and real-time processing and QoS (Quality) in the MMSC 40. It is possible to provide a mobile terminal with a multimedia streaming service such as video, audio, etc. requiring control of the service through the WAP gateway 60.

The MMSC 40 converts the multimedia streaming message set from the Internet into a media form (MPEG4) according to the profile of the receiver in the multimedia message processing unit and stores the multimedia streaming message in the VOD server 50, and then stores the message in the VOD server 50. By including the URI information of the arrival of a new message to the mobile terminal of the receiver through the WAP gateway 60, and provides a multimedia streaming service to the mobile terminal of the receiver through the redirect (Redirect) with the VOD server (50). In addition, the MMSC 40 provides a real-time multimedia streaming service by transmitting a real-time call control signal to a mobile terminal through interworking with a call signal control function (CSCF) according to a SIP (Simple Initiate Protocol) protocol.

The VOD server 50 provides multimedia access to a mobile terminal approaching the HTTP 'GET' method using a real-time transmission protocol based on a Real-time Transfer Protocol / RT Control Protocol (RTP) protocol or a RT Streaming Protocol (RTSP) protocol. Send the message in real time.

At this time, when the mobile terminal is notified of the arrival of a new multimedia message from the MMSC 40, the mobile terminal requests transmission to the VOD server 50 in which the multimedia message is stored in the HTTP 'GET' method.

With reference to the flowchart of FIG. 5 and the MMS interface and protocol stack of FIG. 6, the procedure of the operation of the multimedia streaming service for the mobile terminal in the wireless Internet according to the present invention having such a configuration will be described in detail as follows.

First, an interface using an RTP / RTCP protocol based on the UDP (User Datagram Protocol) protocol or a real time multimedia streaming control protocol such as an RTSP protocol is provided between the IP network and the MMSC 40 to enable multimedia streaming transmission.

In addition, in order to perform multimedia streaming transmission through the interface between the IP network and the MMSC 40, transmission and reception address information acquisition, address conversion, and authentication are performed using the SIP protocol, and the IP network connected to the MMSC 40 is performed. In order to transmit a multimedia streaming message through an IP network, an internal call is set, and in addition, a VOD-type multimedia such as a video advertisement or a movie of an ISP (Internet Service Provider) can be directly stored in the VOD server 50.

In this state, when the multimedia message is received from the IP network or the e-mail server, the multimedia message processing unit of the MMSC 40 extracts user information from the SIP header or e-mail header included in the received multimedia message and performs authentication. The information of the user and the mobile terminal is extracted from the profile of the receiver to perform real-time or non-real-time media format conversion through buffering (steps S51 and S52).

In this case, if the received multimedia message is a video (AVI, MPEG, MOV, DAT), it is converted into H.263 or MPEG4 type media, but the media is in a format that matches the screen resolution and color supported by the receiver's mobile terminal. Will be converted.

The MMSC 40 stores the format-converted media in the VOD server 50 in real time. In this case, the MMSC 40 stores the format-converted media in the VOD server 50 in the form of a multimedia database or a file (step S53). ).

Thereafter, the MMSC 40 notifies the receiver of the mobile terminal that a new multimedia message has arrived (step S54). In this case, the VOD server 50 in which the sender's address, media type, size, and media are stored in the arrival notification message. The URI information is transmitted to the receiver's mobile terminal through the WAP gateway 60, and retransmission is performed after a predetermined time when the transmission fails.

Accordingly, the mobile terminal receiving the arrival notification message of the new multimedia message first transmits a response message for the notification message to the MMSC 40 through the WAP gateway 60 (step S55), and then receives the newly arrived multimedia message. You can choose whether to reject, reject or delete.

If the newly arrived multimedia message is approached to the MMSC 40 by using the URI for the multimedia message to be received by the 'GET' method of the HTTP protocol, the MMSC 40 in the VOD server ( 50) is connected to the VOD server 50 by the MMS 'GET' method through the redirection, so that the VOD server 50 converts the media, ie, multimedia messages, converted to the receiver profile by the MMSC 40 in real time. The data is transmitted to the mobile terminal of the receiver (steps S56 and S57).

At this time, the VOD server 40 provides message transmission and reception functions through the video / audio codec of the RTP / RTCP protocol, UDP, and IP protocol layers of the RTP / RTCP protocol to provide dynamic transmission for the multimedia streaming service to the mobile terminal. And playback, and the RTP / RTCP protocol or RTSP protocol improves the quality of real-time multimedia streaming services through jitter, transmission loss and dynamic resource utilization.

In addition, network interworking required for the actual transmission of multimedia messages requires network interworking using a GGSN (GPRS Gateway Support Node) or RTP interface and UDP / IP protocol, and call signaling control (CSCF) for real-time call control through SIP protocol. Protocol linkage is required.

On the other hand, as a real-time call control through the SIP protocol, it is possible to receive a streaming service for immediately receiving and playing multimedia messages in a mobile terminal through call signal conversion and transmission without media conversion and message arrival notification.

For example, when a phone number or address of a specific mobile terminal is input from a PC connected through the Internet, call setup is performed using the SIP protocol. When the call is set up, transmission control of RTP / RTCP protocol is performed. The multimedia streaming message is sent to the MMSC 40.

Accordingly, the MMSC 40 performs a media conversion operation in real time through buffering of the received multimedia streaming message and stores it in the VOD server 50.

Thereafter, when media conversion and storage are completed, an arrival notification message is transmitted to the receiver's mobile terminal or an incoming call signal is received. When the SIP call setup is completed, the converted multimedia streaming message is transmitted through the flow control of the RTP / RTSP protocol. To the mobile terminal.

As described above, in the present invention, the multimedia streaming service can be provided so that the mobile terminal can receive various media such as an e-mail of the Internet or a multimedia message of the mobile terminal through interworking with the MMSC 40 and the VOD server 50. Will be.

In addition, the embodiment according to the present invention is not limited to the above description, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art in connection with the present invention. In the case of video ads, the video ads can be stored in the VOD server first to secure business feasibility, and can be received through notification to the group that wants to receive them. It is possible to provide a video advertising service.

As described above, according to the system and method of a multimedia streaming service in the wireless Internet according to the present invention, it is possible to provide a multimedia streaming service in various media formats to a mobile terminal through redirection with a VOD server that actually stores multimedia messages. Accordingly, it is possible to deliver video messages, movies, voices, broadcasts, as well as video advertisements using mobile multicasting.

In addition, the present invention can be provided with a streaming service that immediately receives and plays a multimedia message in a mobile terminal through call signal conversion and transmission without notification of media conversion and message arrival using real-time call control through the SIP protocol.

Claims (9)

A VOD server for transmitting the format-converted multimedia message in real time to a mobile terminal accessing the HTTP 'GET' method using a real-time multimedia streaming control protocol; After converting the multimedia message received from the IP network or the e-mail server into a media format according to the recipient profile and storing it in the VOD server, the URI information of the VOD server is included and notified of the arrival of a new message to the receiver's mobile terminal. And an MMSC providing a multimedia streaming service to a mobile terminal of the receiver through redirection with the VOD server. The method of claim 1, The real-time multimedia streaming control protocol, the RTP / RTCP protocol based on the user datagram protocol, the multimedia streaming service system in the wireless Internet, characterized in that any one of the RTSP protocol. The method of claim 1, The MMSC performs a call setup to a mobile terminal of a receiver through interworking with an IP network according to a SIP protocol, and provides a streaming service for the received multimedia message. Performing a media format conversion according to the profile of the receiver when a multimedia message is received through an IP network or an email server; Storing the format-converted media in the VOD server and notifying the mobile terminal of the receiver of the arrival of a new multimedia message; In the case of accessing the MMSC to receive the newly arrived multimedia message, the multimedia streaming in the wireless Internet, comprising the step of providing a streaming service for the multimedia message by MMS 'GET' method through the redirect with the VOD server. Service method. The method of claim 4, wherein And receiving a multimedia streaming message through an interface using a real-time multimedia streaming control protocol based on a user datagram protocol between the IP network and the MMSC. The method of claim 4, wherein The process of converting the media format may include converting the received multimedia message into a media in H.263 or MPEG4 format when the received multimedia message is a video, and converting the media format into media having a format suitable for a screen resolution and a supported color supported by the receiver's mobile terminal. Multimedia streaming service method in the wireless Internet, characterized in that. The method of claim 4, wherein The notifying of the arrival of the new multimedia message to the receiver's mobile terminal includes notifying the arrival information message of the sender's address, media type, size, and URI information of the VOD server storing the converted media. Method of multimedia streaming service in wireless internet. The method of claim 4, wherein The process of providing a streaming service for a multimedia message through redirection with the VOD server may be performed by transmitting and receiving a message using a video / audio codec of a higher RTP / RTCP protocol, a lower UDP, or an IP protocol in the VOD server. A multimedia streaming service method in a wireless Internet, characterized by providing a streaming service for a multimedia message by enabling dynamic transmission and playback of a multimedia message to a mobile terminal of a receiver. The method of claim 4, wherein When a multimedia message is received through the IP network or an e-mail server, performing a call setup with a receiver's mobile terminal using a SIP protocol; When the call is set up, after performing the media conversion in real time through the buffering, and transmitting and playing the multimedia message to the mobile terminal of the receiver using the RTP / RTCP protocol further comprises providing a streaming service Multimedia streaming service method on the Internet.