KR100882604B1 - Control system and method for vod service session based on the ims - Google Patents

Abstract

A control system for a VOD(Video On Demand) service session based on IMS(IP Multimedia Subsystem) and a method thereof are provided to configure an additional system which performs VOD service session control with an application sever of an IMS based control network so that a VOD service may be provided in an IMS based network without switching to a new terminal and a new server. A service request receiving unit(110) receives a VOD service request message from an IMS sever(30). A VOD sever selecting unit(120) selects a VOD sever containing the requested VOD contents when receiving a VOD service request message. An information collecting unit(130) requests from the selected VOD sever the information necessary for the provision of QoS. A session information transmission unit(150) transmits the VOD service session information to the IMS server by including the VOD session information in a response message to the VOD service request message. A VOD service session settlement unit(160) receives a session connection completion message from the VOD sever and transmits a VOD service session settlement message to the IMS sever.

Description

IMS-based video service session control system and method {Control system and method for VOD service session based on the IMS}

The present invention relates to an IMS-based VOD service session control system and method, and more particularly, to a session control technology for providing a VOD service.

The present invention is derived from the research conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Telecommunication Research and Development. [Task Management Number: 2006-S-058-02, Title: All-IP-based Integrated Network] Service control technology development].

Conventional VOD service control technology finds the location of a video file stored in the VOD server through the HyperText Transport Protocol (HTTP) or Real Time Streaming Protocol (RTSP), and the port, address, and codec information for transmitting the video file from the VOD server. And then play back or stop the video file in real time.

The conventional VOD service control technology is a technology of a client server structure that relies on communication between a VOD terminal and a VOD server, and a separate network must be constructed for quality assurance through user authentication and securing network resources.

IMS (IP Multimedia Subsystem) based network technology performs session control through Session Initial Protocol (SIP) and performs functions such as user authentication, session-based quality of service (QoS) resource allocation and billing according to service characteristics. Next generation network technology.

If VOD service is implemented in IMS based network, existing VOD terminal and VOD server should be replaced with new terminal and server based on SIP, SIP message should be changed for streaming control and programmed to be processed in IMS platform. Various problems arise.

Accordingly, the present inventors have studied a technology for implementing a VOD service in an IMS-based network without replacing an existing VOD terminal and a VOD server with a new terminal and server based on a SIP.

The present invention has been invented under the above-mentioned object, and implements a separate system for performing VOD service session control as an application server of an IMS-based control network to replace a VOD service in an IMS-based network without replacing a SIP-based new terminal and server. An object of the present invention is to provide an IMS-based VOD service session control system and method.

According to an aspect of the present invention for achieving the above object, the present invention is an IMS-based VOD service session control system (IMS-based control) upon receiving a Video On Demand (VOD) service request message from an IP Multimedia Subsystem (IMS) server A session control server implemented as an application server of a network selects a VOD server having VOD service requested VOD service, requests and receives information required to provide a Quality of Service (QoS) to the selected VOD server, and receives the received QoS. It generates a VOD service session information based on the information necessary for providing, including it in the response message to the VOD service request message and transmits it to the IMS server that reserves and allocates the IP resource.

The present invention implements a separate system for performing the VOD service session control as an application server of the IMS-based control network to provide a VOD service in the IMS-based network without replacing the SIP-based new terminal and server, it is more personalized Through IMS-based network supporting suitable convergence services by service characteristics, VOD service can be provided with low development investment cost without adding new equipment.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

1 is a schematic diagram of the present invention. As shown in the figure, the VOD terminal 10 and the VOD server 20 are interworked through an IP network, VOD streaming control is performed through a Real Time Streaming Protocol (RTSP), and the VOD stream is a real-time RTP. It is transmitted from the VOD server 20 to the VOD terminal 10 through the Transport Protocol.

The IP Multimedia Subsystem (IMS) based network includes an IMS server 30 that performs IP resource reservation and allocation, and the network control server 40 for controlling QoS (Quality of Service) resources of the IP transport network according to a service. Interlocked.

In the present invention, a session control server (hereinafter referred to as an IMS-based VOD service session control system) as an application server of an IMS-based control network for controlling VOD service sessions in an IMS-based network is interworked with the VOD server 20.

The VOD terminal 10 requests a Video On Demand (VOD) service to the session control system 100 through the IMS server 30 using a Session Initial Protocol (SIP). Accordingly, the VOD terminal 10 performs both a SIP terminal function as an IMS terminal and an RTSP terminal function as a VOD terminal.

The IMS server 30 performs a proxy call / session control function, a user authentication function, a serving call session control function that performs interworking with the VOD terminal 10, and a user for a session control request from the VOD terminal 10. Routing is performed to the session control system 100 or another terminal through service control based on profile information.

The IMS-based VOD service session control system 100 operates as an IMS application server serving as a SIP destination terminal for a service request requesting a VOD service as an incoming call, and the VOD server 20 is configured through RTSP or HTTP. Performs interworking function that requires content information. The VOD server 20 has the RTSP-based VOD server function of the existing network as it is.

2 is a block diagram according to an embodiment of an IMS-based VOD service session control system according to the present invention.

As shown in the figure, the IMS-based VOD service session control system 100 according to the present invention includes a service request receiving unit 110, a VOD server selecting unit 120, an information collecting unit 130, and session information. The generation unit 140 and the session information transmitter 150 are included.

The service request receiver 110 receives a video on demand (VOD) service request message (SIP INVITE) from an IP multimedia subsystem (IMS) server 30.

That is, when the video on demand (VOD) terminal 10 transmits a VOD service request message (SIP INVITE) to the IMS (IP Multimedia Subsystem) server 30, the IMS server 30 transmits an IMS-based VOD according to the present invention. The VOD service request message (SIP INVITE) is relayed to the service session control system 100. Then, the IMS-based VOD service session control system 100 according to the present invention receives a video on demand (VOD) service request message (SIP INVITE) from the IMS (IP Multimedia Subsystem) server 30 through the service request receiver 110. ).

In this case, the VOD service request message may include Uniform Resource Identifier (URI) information indicating a VOD service and parameter information indicating Contents. For example, the VOD service request message may include information indicating a VOD service such as vod@etri.re.kr and parameter information indicating a content such as URI = "crid".

The VOD server selecting unit 120 selects the VOD server 20 having the VOD service request VOD content upon receiving the VOD service request message by the service request receiving unit 110. That is, the VOD content requested for the VOD service is identified by Uniform Resource Identifier (URI) information, parameter information indicating the content, and the like, and the IMS-based VOD service session control system 100 according to the present invention identifies this. The VOD server 20 having the VOD contents corresponding to the received information is searched and selected through the VOD server selector 120.

In this case, when the VOD server selector 120 has a plurality of VOD servers 20 having the requested VOD content, the VOD server selector 120 may select an optimal VOD server according to a session control policy.

For example, the VOD server selector 120 may select the closest VOD server among a plurality of VOD servers based on the subscriber information requesting the VOD service according to the session control policy.

Alternatively, the VOD server selector 120 may select the VOD server having the least load among a plurality of VOD servers according to the session control policy.

The information collecting unit 130 requests and receives information necessary for providing a quality of service (QoS) to the VOD server 20 selected by the VOD server selecting unit 120.

That is, when the optimal VOD server 20 having the VOD content requested by the VOD server selection unit 120 is selected, the IMS-based VOD service session control system 100 according to the present invention is the information collection unit ( Information required for providing a Quality of Service (QoS) to the selected VOD server 20 through 130 is requested, for example, characteristic information and bandwidth information of the VOD content required for providing the QoS, and from the corresponding VOD server 20. Receive information necessary for providing the requested QoS.

The session information generation unit 140 generates VOD service session information based on the information necessary for providing the QoS collected by the information collection unit 130.

That is, when information necessary for providing QoS such as characteristic information and band information of VOD content is collected by the information collecting unit 130, the IMS-based VOD service session control system 100 according to the present invention may provide the session information. The VOD service session information for the VOD service call connection between the VOD terminal 10 and the VOD server 20 is generated and stored in a database based on the information necessary for providing QoS collected through the generation unit 140.

In this case, the VOD service session information may further include extended tag information for receiving the same call related information from the VOD server 20. Therefore, the IMS-based VOD service session control system 100 according to the present invention transmits the extended tag information by including the etag information in the VOD service session information, and when the same call-related information is received from the VOD server 20 later, the extended tag is received. (etag) can be used to identify which VOD service call related information. This will be described in detail later.

The session information transmitter 150 includes the VOD service session information generated by the session information generator 140 in the response message 200 OK for the VOD service request message to the IMS server 30.

That is, when the VOD service session information for the VOD service call connection between the VOD terminal 10 and the VOD server 20 is generated by the session information generator 140, the IMS-based VOD service session control system according to the present invention. The 100 transmits the VOD service session information to the IMS server 30 by including the VOD service session information in the response message 200 OK for the VOD service request message through the session information transmitter 150.

Then, the IMS server 30 receiving the VOD relays the response message (200 OK) including the VOD service session information to the VOD terminal 10, and receives the response message (200 OK) including the VOD service session information. 10 sends a response acknowledgment message (SIP ACK) to the IMS server 30.

During this process, each VOD terminal 10 transmits a connection setup message (RTSP Setup) to the selected VOD server 20, and the IMS server 30 transmits an IP resource of a band required for VOD stream transmission to the network control server 40. Book through.

In addition, the VOD server 20 receiving the connection setup message (RTSP Setup) transmits a response message (200 OK) thereto to the VOD terminal 10, and simultaneously the IMS-based VOD service session control system according to the present invention ( Transmits a session connection setup complete message (Setup Complete), and the VMS service session control system 100 based on IMS according to the present invention sends a VOD service session confirmation message (SIP UPDATE) to confirm the connection of the VOD service session. When transmitting to the IMS server 30, the IMS server 30 allocates the reserved IP resources through the network control server 40 to complete the VOD service session connection between the VOD terminal 10 and the VOD server 20 to the VOD The VOD content requested from the server 20 to the VOD terminal 10 is transmitted.

By doing so, the present invention implements a separate system for performing VOD service session control (IMS-based VOD service session control system according to the present invention) as an application server of an IMS-based control network and replaces it with a SIP-based new terminal and server. VOD services can be provided in IMS-based networks.

Therefore, it is possible to provide a VOD service at a low development investment cost without adding new equipment through an IMS-based network supporting a more personalized and suitable service for each service characteristic, thereby achieving the above object of the present invention. Will be.

Meanwhile, according to an additional aspect of the present invention, the IMS-based VOD service session control system 100 according to the present invention may further include a VOD service session determination unit 160.

The VOD service session determination unit 160 receives a session connection establishment complete message including the extended tag information from the VOD server 20 and determines a VOD service session identified by the extended tag information. The VOD service session confirmation message (SIP UPDATE) for confirming the connection is transmitted to the IMS server 30.

That is, the IMS-based VOD service session control system 100 according to the present invention includes the VOD service session information in the response message (200 OK) for the VOD service request message through the session information transmitter 150 to the IMS server ( 30), the IMS server 30 receiving the relaying of the response message (200 OK) including the VOD service session information to the VOD terminal 10, the VOD terminal 10 is selected VOD server 20 It sends a connection setup message (RTSP Setup) containing extended tag information.

Then, the VOD server 20 receiving this transmits the session connection establishment complete message including the extended tag information to the IMS-based VOD service session control system 100 according to the present invention to complete the VOD service session connection. Ask. Upon receiving this, the IMS-based VOD service session control system 100 according to the present invention uses the VOD service session determination unit 160 to determine the connection of the VOD service session identified by the extended tag information. The connection of the VOD service session is confirmed by transmitting a service session confirmation message (SIP UPDATE) to the IMS server 30 and storing the determined information in a database.

By doing so, the IMS server 30 receiving the VOD service session confirmation message (SIP UPDATE) connects the reserved IP resources to complete the VOD service session connection between the VOD terminal 10 and the VOD server 20. Since the requested VOD content is transmitted to the VOD terminal 10 from 20), it is possible to provide a VOD service in the IMS-based network without replacing the SIP-based new terminal and server.

Meanwhile, according to an additional aspect of the present invention, the IMS-based VOD service session control system 100 according to the present invention may further include a session release unit 170. The session release unit 170 receives a VOD service session release request message (BYE) from the IMS server 30, and accordingly releases the VOD service session.

That is, when the reception of the VOD content is completed or when the VOD content is transmitted, the VOD terminal 10 transmits the termination request message (RTSP TEARDOWN) to the VOD server 20, and at the same time the VOD content to the IMS server 30. Send a service session release request message (BYE).

Then, the IMS server 30 receiving the VOD service session release request message (BYE) relays this to the IMS-based VOD service session control system 100 according to the present invention and releases the IP resources connected at the same time.

Upon receiving the VOD service session release request message (BYE), the IMS-based VOD service session control system 100 according to the present invention responds to the VOD service session release request message (BYE) through the session release unit 170. (200 OK) is transmitted to the VOD terminal through the IMS server, and the release of the VOD service session is completed by deleting the corresponding VOD service session information from the database.

Therefore, the VOD content reception is completed by this, or the VOD service session between the VOD terminal 10 and the VOD server 20 is released by the termination request during the VOD content transmission.

Referring to FIG. 3, the VOD service session control operation of the IMS-based VOD service session control system 100 according to the present invention having the above-described configuration will be described in more detail. 3 is a flowchart according to an embodiment of a VOD service session control operation of an IMS based VOD service session control system according to the present invention.

First, in step S110, a Video On Demand (VOD) terminal that wants to receive VOD content transmits a VOD service request message (SIP INVITE) to an IP Multimedia Subsystem (IMS) server. In this case, the VOD service request message may include Uniform Resource Identifier (URI) information indicating a VOD service and parameter information indicating content.

Then, in step S120, the IMS server 30 relays the VOD service request message (SIP INVITE) to the session control server (MS-based VOD service session control system according to the present invention).

Then, in step S130, the session control server that receives the VOD service request message (SIP INVITE) selects a VOD server having the VOD content requested for the VOD service.

In this case, when there are a plurality of VOD servers having the VOD content requested by the session control server, an optimal VOD server may be selected according to a session control policy.

For example, the session control server may select the closest VOD server among the plurality of VOD servers based on the subscriber information requesting the VOD service according to the session control policy.

Alternatively, the session control server may select the VOD server having the least load among the plurality of VOD servers according to the session control policy.

Next, in step S140, the session control server requests and receives information necessary for providing a quality of service (QoS) to the selected VOD server. In this case, the information necessary for providing QoS may include characteristic information and band information of the VOD content.

In operation S150, the session control server generates VOD service session information based on the information necessary for providing the received QoS.

Next, in step S160, the session control server includes the generated VOD service session information in the response message (200 OK) for the VOD service request message and transmits it to the IMS server.

Then, in step S170, the IMS server relays the response message 200 OK including the VOD service session information to the VOD terminal.

By doing so, the processing of the VOD service session request is completed, and then the VOD service session determination procedure is performed.

First, the VOD terminal receiving the response message 200 OK including the VOD service session information in step S210 transmits a response acknowledgment message (SIP ACK) to the IMS server, and simultaneously connects to the selected VOD server. ).

Then, the IMS server receiving the response acknowledgment message (SIP ACK) in step S220a reserves the IP resource of the band required for transmitting the VOD stream through the network control server, and receives the connection setup message (RTSP Setup) in step S220b. The VOD server transmits a response message (200 OK) to the VOD terminal, and simultaneously transmits a session connection setup complete message (Setup Complete) to the session control server.

Next, in step S230, the session control server receiving the session connection setup complete message (Setup Complete) transmits a VOD service session confirmation message (SIP UPDATE) to confirm the connection of the VOD service session to the IMS server.

Then, in step S240, the IMS server sends a VOD service session determination message (SIP UPDATE) to the VOD terminal, thereby completing the VOD service session determination procedure.

By doing so, when the VOD service session establishment procedure is completed, the VOD service session connection procedure is performed.

First, the VOD terminal receiving the VOD service session determination message (SIP UPDATE) in step S310 transmits a response message (200 OK) to the IMS server.

Then, the IMS server receiving the response message (200 OK) in step S320 transmits it to the session control server, and allocates the reserved IP resource through the network control server to complete the VOD service session connection between the VOD terminal and the VOD server. do.

Therefore, since the VOD service session connection is completed and the requested VOD content is transmitted from the VOD server to the VOD terminal, the VOD service can be provided in the IMS-based network without replacing the SIP-based new terminal and server. .

If VOD content reception is completed or there is a termination request during VOD content transmission, the VOD service session release procedure is performed.

First, in step S410, the VOD terminal transmits a termination request message (RTSP TEARDOWN) to the VOD server, and simultaneously transmits a VOD service session release request message (BYE) to the IMS server.

Next, in step S420, the IMS server relays the VOD service session release request message (BYE) to the session control server, and simultaneously releases the allocated IP resource through the network control server.

Then, the session control server receiving the VOD service session release request message (BYE) in step S430 sends a response message (200 OK) to the VOD terminal through the IMS server to complete the release of the VOD service session.

By doing so, the VOD service session release operation is completed, and the VOD content reception is completed, or the VOD service session is released between the VOD terminal and the VOD server by the termination request during the VOD content transmission.

Accordingly, since the VOD service session is connected and released according to the above operation, the present invention implements a separate system for performing VOD service session control as an application server of the IMS-based control network and replaces it with a SIP-based new terminal and server. Since VOD service can be provided in IMS-based network without using new equipment, VOD service can be provided at low development investment cost without adding new equipment through IMS-based network that supports convergence service that is more personalized and suitable for each service characteristic. The object of the present invention presented above can be achieved.

While the invention has been described with reference to the preferred embodiments, which are referred to by the accompanying drawings, it is apparent that various modifications are possible without departing from the scope of the invention within the scope covered by the following claims from this description. .

The present invention can be used industrially in the field of session control and its application for providing VOD services.

1 is a schematic diagram of the present invention

2 is a block diagram according to an embodiment of an IMS-based VOD service session control system according to the present invention.

3 is a flowchart according to an embodiment of a VOD service session control operation of an IMS based VOD service session control system according to the present invention;

Description of the main parts of the drawing

10: VOD terminal 20: VOD server

30: IMS server 40: network control server

100: session control system 110: service request receiving unit

120: VOD server selection unit 130: information collecting unit

140: session information generator 150: session information transmitter

160: session determination unit 170: session release unit

Claims (13)

A service request receiver for receiving a video on demand (VOD) service request message from an IP multimedia subsystem (IMS) server; A VOD server selecting unit which selects a VOD server having a VOD service requested VOD content upon receiving a VOD service request message by the service request receiving unit; An information collecting unit for requesting and receiving information necessary for providing a quality of service (QoS) to a VOD server selected by the VOD server selecting unit; A session information generator for generating VOD service session information based on information necessary for providing QoS collected by the information collector; A session information transmitter for including the VOD service session information generated by the session information generator in a response message to the VOD service request message and transmitting the same to the IMS server; IMS-based VOD service session control system, characterized in that comprises a. The method of claim 1, The VOD service session information is: IMS-based VOD service session control system further comprises extended tag information for receiving the same call-related information from the VOD server. The method of claim 2, The IMS-based VOD service session control system is: Receiving a session connection establishment complete message including the extended tag information from the VOD server, VOD service session confirmation to send a VOD service session confirmation message to the IMS server to confirm the connection of the VOD service session identified by the extension tag information To call; IMS-based VOD service session control system, characterized in that it further comprises. The method of claim 3, wherein The IMS-based VOD service session control system is: A session release unit configured to receive a VOD service session release request message from the IMS server, and thereby release the VOD service session; IMS-based VOD service session control system, characterized in that it further comprises. The method according to any one of claims 1 to 4, The VOD server selection unit: IMS-based VOD service session control system, characterized in that the VOD server is selected according to the Session Control Policy, if there are a plurality of VOD servers holding the requested VOD content. The method of claim 5, wherein The VOD server selection unit: According to the session control policy, IMS-based VOD service session control system, characterized in that for selecting the nearest VOD server among a plurality of VOD server based on the subscriber information requesting the VOD service. The method of claim 5, wherein The VOD server selection unit: According to the session control policy, IMS-based VOD service session control system, characterized in that for selecting the VOD server with the least load among the plurality of VOD server. The method according to any one of claims 1 to 4, The information needed to provide the QoS is: IMS-based VOD service session control system comprising the characteristic information and band information of the VOD content. The method according to any one of claims 1 to 4, The VOD service request message is: An IMS-based VOD service session control system, comprising: Uniform Resource Identifier (URI) information indicating a VOD service and parameter information indicating content. a) transmitting, by the Video On Demand (VOD) terminal, a VOD service request message to an IP Multimedia Subsystem (IMS) server; b) the IMS server relaying the VOD service request message to the session control server; c) selecting, by the session control server receiving the VOD service request message, a VOD server having the VOD service requested VOD content; d) requesting and receiving information necessary for providing a Quality of Service (QoS) to the selected VOD server by the session control server; e) generating, by the session control server, VOD service session information based on the information required for providing the received QoS; f) sending, by the session control server, the generated VOD service session information to the IMS server including the response message to the VOD service request message; g) relaying, by the IMS server, a response message including the VOD service session information to the VOD terminal; IMS-based VOD service session control method comprising the. The method of claim 10, The IMS-based VOD service session control method is as follows: h) transmitting, by the VOD terminal receiving the response message including the VOD service session information, to the IMS server a response acknowledgment message and simultaneously transmitting a connection establishment message to the selected VOD server; i) receiving, by the IMS server, a response acknowledgment message, reserving IP resources of a band required for transmitting the VOD stream through the network control server; j) the VOD server receiving the connection establishment message transmits a response message to the VOD terminal, and simultaneously transmits a session connection establishment completion message to the session control server; k) the session control server receiving the session connection establishment complete message, transmitting a VOD service session establishment message to the IMS server to confirm the connection of the VOD service session; l) sending, by the IMS server, a VOD service session establishment message to the VOD terminal; IMS-based VOD service session control method characterized in that it further comprises. The method of claim 11, The IMS-based VOD service session control method is as follows: m) the VOD terminal receiving the VOD service session establishment message, transmitting a response message to the IMS server; n) receiving, by the IMS server, the response message and transmitting the same to the session control server and allocating the reserved IP resource through a network control server to complete a VOD service session connection between the VOD terminal and the VOD server; IMS-based VOD service session control method characterized in that it further comprises. The method of claim 12, The IMS-based VOD service session control method is as follows: o) transmitting, by the VOD terminal, a termination request message to the VOD server, and simultaneously transmitting a VOD service session release request message to the IMS server; p) relaying, by the IMS server, a VOD service session release request message to the session control server, and at the same time releasing an allocated IP resource through the network control server; q) the session control server receiving the VOD service session release request message and transmitting a response message to the VOD terminal through the IMS server to complete the release of the VOD service session; IMS-based VOD service session control method characterized in that it further comprises.

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