KR19990042008A - Stream control method for interworking between internet and asynchronous delivery mode network - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a stream control method for interworking between the Internet and an asynchronous delivery mode network.

2. The technical problem to be solved by the invention

An object of the present invention is to provide a stream control method for allowing an internet user to control a stream transmitted from a server of an asynchronous delivery mode network in a system environment in which the Internet and an asynchronous delivery mode network are interworked.

3. Summary of Solution to Invention

The present invention includes a first step of checking the syntax of the received message for each message type by checking the type of the RTSP message received from the Internet client system; Generating a response message to the received message to the Internet client system, converting the received message into a DSM-CC UU message, and then checking the converted message type; And a third step of establishing or releasing a communication connection according to the type of the converted message or transmitting the converted message to the UU stream server.

4. Important uses of the invention

The present invention is used in the interworking method between heterogeneous networks.

Description

Stream control method for interworking between internet and asynchronous delivery mode network

The present invention is to control the stream when the Internet user receives a real-time stream such as video on demand (VOD) from the server of the asynchronous delivery mode network in a system environment in which the Internet and the asynchronous delivery mode network is interworked. It relates to a method for controlling streams.

The Internet Engineering Task Force (IETF), a standardization organization, proposes a Real Time Streaming Protocol (RTSP) for real-time stream control on the Internet. In addition, the DAVIC (Digital Audio VIsual Council), a standardization organization, uses Digital Storage Media Command and Control (DSM-CC) to control real-time streams based on the asynchronous delivery mode network. User: UU) protocol is adopted, and DSM-CC UU protocol is currently standardized by ISO / IEC, the international standardization organization.

Currently, each standardization organization specifies and uses a standard for stream control for each of the Internet and the asynchronous delivery mode network, but there is no method for controlling the stream in a system environment in which the Internet and the asynchronous delivery mode network interwork.

Therefore, the related art is to provide a multimedia service provided by a server of an asynchronous delivery mode network in a system environment in which the internet and an asynchronous delivery mode network are interworked through stream control between the Internet and an asynchronous delivery mode (ATM) network. However, there is a problem that the Internet client system cannot receive the multimedia service unless the Internet client system has the capability to receive the multimedia service from the server in the asynchronous delivery mode network.

Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, in which the user of the Internet receives a real-time stream from a server of the asynchronous delivery mode network in a system environment in which the internet and the asynchronous delivery mode network are interworked. In this case, an object of the present invention is to provide a method for controlling a stream between the Internet and an asynchronous delivery mode network so that an Internet user can control a stream transmitted from a server in an asynchronous delivery mode network.

1 is a configuration diagram of an interworking system between the Internet and an asynchronous delivery mode network to which the present invention is applied.

2A and 2B are a flowchart illustrating a method for controlling a stream between the Internet and an asynchronous delivery mode network according to the present invention.

3A and 3B are detailed flowcharts illustrating a process of converting the Internet stream control message of FIG. 2B into an asynchronous delivery mode network stream control message.

* Explanation of symbols for main parts of the drawings

11: client system 12: Internet

13 interlocking system 14 asynchronous delivery mode network

15: Broker System 16: User-to-User Stream Server

The present invention for achieving the above object, in the stream control method applied to the interworking system between the Internet and the asynchronous delivery mode network, by checking the type of the real-time streaming protocol (RTSP) request message received from the Internet client system for each message type A first step of checking the syntax of the received message; Generating a response message to the received Internet client system, converting the received message into a digital storage medium command and control user-to-user (DSM-CC UU) message, and then checking the converted message type. Two steps; And establishing or releasing a communication connection between the interworking system and the user-to-user stream server for transmitting the converted message according to the type of the converted message, or transmitting the converted message to the user-to-user stream server. Include.

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

The proposed method includes a method for converting an internet stream control protocol into an asynchronous delivery mode network stream control protocol for stream control interworking between the Internet and an asynchronous delivery mode (ATM) network.

In addition, the Internet Engineering Task Force (IETF), a standardization organization, adopted the Real Time Streaming Protocol (RTSP), which is being standardized, as an Internet stream control protocol, and the DAVIC (Digital Audio VIsual Council), a standardization organization, standardized. The Digital Storage Media Command and Control (DSM-CC) User to User (UU) protocol is adopted as the asynchronous delivery mode network stream control protocol. The stream control method between and asynchronous delivery mode networks uses a real time streaming protocol (RTSP) and a digital storage medium command and control (DSM-CC) user-to-user (UU) protocol adopted by the above standardization body.

The stream control method between the Internet and the asynchronous delivery mode network proposed in the present invention accepts the Internet stream control protocol and undergoes a protocol syntax check, and then converts it to the asynchronous delivery mode network stream control protocol according to the type of the Internet stream control protocol. In addition, the real-time streaming protocol (RTSP), which is an internet stream control protocol, includes not only stream control but also session setting and release messages for stream control, and thus, real-time streaming for stream control when converting to an asynchronous delivery mode (ATM) network stream control protocol. Protocol (RTSP) messages are converted to DSM-CC UU stream control protocol messages, and Real-Time Streaming Protocol (RTSP) messages for establishing and tearing down DSM-CC UU sessions are converted to session establishing and tearing down messages, so that DSM-CC UU streams are Induces connection establishment and release behaviors to send control messages to the server. Also, in order to convert the parameter values constituting the RTSP message into parameters constituting the DSM-CC UU message, the RTSP message is parsed during the protocol conversion.

1 is a configuration diagram of an interworking system between the Internet and an asynchronous delivery mode network to which the present invention is applied.

The Internet client system 11 uses the real-time streaming protocol of the Internet to control the stream, and the User to User (UU) stream server 16 uses the digital storage medium command and control (Digital Storage) to control the stream. Media Command and Control (DSM-CC) uses the User to User (UU) protocol.

The interworking system between the Internet and the asynchronous delivery mode network serves to convert a real-time streaming protocol message transmitted by the client system 11 into a DSM-CC UU protocol message that the UU stream server 16 can recognize.

The broker system 15 is a level 2 gateway (Level 2 GateWay: L2GW) and a level 1 gateway (Level 1 GateWay: L1GW) that selects a stream desired by the client and a server providing the stream before the Internet client system receives the stream service. Provide services.

[Table 1] shows the types of real-time streaming protocol request messages and message syntaxes that can be transmitted by Internet client systems.

SETUP and TEARDOWN messages are messages indicating session setup and teardown, and PLAY and PAUSE messages are messages for stream control. A DESCRIBE message is a message for requesting information on a specific stream. In the PLAY and PAUSE messages, Range and Scale are header fields, Range is the position and range for stream playback and stop, and Scale is the stream control. Show direction and speed. If the scale value is '1', it means to play the stream at normal speed.If the scale value is higher than '1', it indicates fast forward of the scale value speed.If the scale value is less than '0', the scale value is Rewind.

Table 2 shows the types and message syntax of digital storage medium command and control (DSM-CC) UU stream control messages that can be processed by the UU stream server.

Table 3 shows a relationship of converting a real time streaming protocol (RTSP) message into a digital storage medium command and control (DSM-CC) UU message in a coordinated system.

In [Table 3], xx and yy values of the range header field of the real-time streaming protocol request message are values representing stream playback or stop positions and ranges, and have a value greater than '0'. If there is no Range header field, the companion system assigns a null value while converting to a Digital Storage Media Command and Control (DSM-CC) UU message.

2A and 2B are a flowchart illustrating a method for controlling a stream between the Internet and an asynchronous delivery mode network according to the present invention.

It is determined whether a real-time streaming protocol (RTSP) request message transmitted by the Internet client system is received (100). If the real-time streaming protocol request message is not received, the state transitions to an initial state, and when the real-time streaming protocol request message is received, the message is received in the message queue. In step 101, the received message is read (101) and the type of the received message is checked (102), and the syntax of the received message is checked (103).

Thereafter, it is determined whether an error exists in the received message (104). If an error exists in the message, a response message indicating that there is an error in the received real-time streaming protocol message is generated (105) and the generated response message is transmitted to the client system. And transition to the initial state, and transition the state of the real-time streaming protocol server state machine if there is no error in the received message (107).

Thereafter, it is determined that the state has been correctly transitioned (108), if the state is not correctly transitioned, generates a response message indicating that there is an error in the received message (109) and transmits the generated response message to the client system (110) and initializes the initial state. When the state transitions correctly, an appropriate response message for the received real-time streaming protocol message is generated (111) and the generated response message is transmitted to the client system (112).

Thereafter, the received RTSP request message is converted into a digital storage medium command and control (DSM-CC) UU message (113), the converted message type is examined (114), and it is determined whether it is a session establishment message. (115) If it is a session establishment message, establish a connection for communication with the UU stream server (116) request the UU stream server for an object reference for the stream object (117) after receiving the object reference from the UU stream server (118). If it is not a session establishment message, it determines whether it is a session release message (119). If it is a session release message, it disconnects for communication with the UU stream server (120), and transitions to an initial state. Otherwise, after the converted digital storage medium command and control UU message is transmitted to the user-to-user stream server (121), it transitions to the initial state.

3A and 3B are detailed flowcharts illustrating a process of converting the Internet stream control message of FIG. 2B into an asynchronous delivery mode network stream control message.

The type of the received real-time stream protocol (RTSP) message is checked (130), and whether it is a session establishment message (131).

If it is not a session establishment message, it is determined whether it is a session release message (133). If it is a session release message, it is converted into a DSM-CC UU session release message (134).

If it is not a session release message, it is determined whether it is a playback message (135). If it is a playback message, the received message header field is examined (136).

Thereafter, it is determined whether the range header field exists (137), and if the range header field does not exist, a scale value is extracted from the scale header field of the received message (138), and a resume (null) is a DSM-CC UU stream control message. , Scale value) message (139).

If the range header field exists, it is determined whether only the start position is defined in the range header field (140). If only the start position is defined in the range header field, the scale value is extracted from the scale header field of the received message (141). The start position value is extracted from the range header field (142) and converted into a start (start position, scale value) message which is a DSM-CC UU stream control message (143).

If there is no value indicating only the start position in the range header field, a scale value is extracted from the scale header field of the received message (144), and a start position and stop position value are extracted (145) from the range header field. In operation 146, the message is converted into a play (start position, stop position, and scale value) message which is a DSM-CC UU stream control message.

As a result of determining whether the message is a playback message (135), if the message is not a playback message, the received message header field is examined (147).

Thereafter, it is determined whether the range header field exists (148). If the range header field does not exist, it is converted into a stop (null) message which is a DSM-CC UU stream control message (149).

If the range header field exists, the stop position value is extracted from the range header field (150) and converted into a stop (stop position) message which is a DSM-CC UU stream control message (151).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

Therefore, as described above, according to the present invention, an Internet user can control a multimedia service provided by a server of an asynchronous delivery mode (ATM) network according to the user's will in a system environment in which the Internet and the asynchronous delivery mode (ATM) network are interworked. In addition, it is possible to reduce the cost of the client system because the multimedia service can be provided without having the ability to receive the multimedia service from the server of the asynchronous delivery mode network in the Internet client system, and the user can save the Internet server or the asynchronous delivery mode. It is effective to receive service in the same way regardless of network server.

Claims (5)

In the stream control method applied to the interworking system between the Internet and the asynchronous delivery mode network, A first step of checking a syntax of a message received for each message type by checking a type of a RTSP request message received from an Internet client system; Generating a response message to the received Internet client system, converting the received message into a digital storage medium command and control user-to-user (DSM-CC UU) message, and then checking the converted message type. Two steps; And A third step of establishing or releasing a communication connection between the interworking system and the user-to-user stream server for transmitting the converted message according to the type of the converted message, or transmitting the converted message to the user-to-user stream server. Stream control method comprising a. The method of claim 1, The first step is, A fourth step of reading a message received in a message queue from the Internet client system; A fifth step of checking the type of received message; And Sixth step to check message syntax by type Stream control method comprising a. The method according to claim 1 or 2, The second step, A seventh step of determining whether an error exists in the received message; An eighth step of sending a response message to the Internet client system if an error exists in the received message; A ninth step of transitioning a state of the real-time streaming protocol server machine if there is no error in the received message; A tenth step of determining whether the state is correctly transitioned; An eleventh step of sending a response message to the Internet client system notifying that there is an error in the received message if the state is not correctly transitioned; And A twelfth step of transmitting a response message to the client system when the state is correctly transitioned and converting the received message into the digital storage medium command and control user to user (DSM-CC UU) protocol message; Stream control method comprising a. The method of claim 3, wherein The twelfth step, Checking the received message type and converting the received message type into the DSM-CC UU session establishment message if the session establishment message and converting it into the session release message if the DSM-CC UU session release message; Checking a received message type and determining whether the message is a session release message or a playback message; A fifteenth step of extracting a stop position value if the range header field exists by converting the received message header field into a stop (stop position) message which is a DSM-CC UU stream control message if the range header field is not present; A sixteenth step of determining whether a range header field exists by examining the received message header field if the message is a playback message; A 17th step of extracting a scale value from the scale header field of the received message and converting the scale value into a start (null, scale value) message which is a DSM-CC UU stream control message if the range header field does not exist; An eighteenth step of determining whether only a start position is defined in the range header field if the range header field exists; If only the start position is defined, the scale value is extracted from the scale header field of the received message, and the start position value is extracted from the range header field and converted into the start (start position, scale value) message, which is a DSM-CC UU stream control message. A nineteenth step; And If only the start position is not defined, the scale value is extracted from the scale header field of the received message, and the start position and stop position values are extracted from the range header field to play the DSM-CC UU stream control message (start position, stop position). , Scale 20) message to the 20th step Stream control method comprising a. The method of claim 4, wherein The third step, A twenty-first step of determining whether it is the session establishment message; And if the session establishment message, establishes a connection between the interworking system and the user-to-user stream server, requests an object referrer for a stream object from the user-to-user stream server, and receives an object referrer from the user-to-user stream server. Step 22; A twenty-third step of determining if the session establishment message is not the session establishment message; A twenty-fourth step of disconnecting the interworking system and the user-to-user stream server if the session release message; And A twenty-fifth step of transmitting the converted message of the user-to-user stream server to the user-to-user server system if the session release message is not; Stream control method comprising a.