KR100861125B1 - Method and system for providing alternative video service based on mobile communication network - Google Patents

Abstract

The present invention relates to a method and system for providing an alternative video service based on a mobile communication network.

An alternative video service providing method according to an embodiment of the present invention comprises the steps of receiving a first media stream from a first terminal performing a video call, and a second video is inserted in place of the video data included in the first media stream. Transmitting the media stream to a second terminal.

Description

Method and system for providing alternative video service based on mobile communication network {Method and system for providing a substitute image service based on mobile communication network}

1 is a diagram illustrating a system for providing an alternative video service according to an embodiment of the present invention.

2 is a flowchart illustrating a subscriber registration process according to an embodiment of the present invention.

3 is a flowchart illustrating a call processing process of an originating IMS according to an embodiment of the present invention.

4 is a flowchart illustrating an alternative video service providing process according to an embodiment of the present invention.

5 is a flowchart illustrating a process of stopping providing a substitute video service according to an embodiment of the present invention.

6 is a flowchart illustrating a process of resuming a substitute video service according to an embodiment of the present invention.

7 is a flowchart illustrating a call processing procedure of a called party IMS according to an embodiment of the present invention.

8 is a diagram illustrating an alternative video service providing system according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

110: CSCF 112: P-CSCF

114: I-CSCF 116: S-CSCF

120: HSS 130: media processing server

The present invention relates to a video call, and more particularly, to a method and system for providing an alternative video service in a video call based on an internet protocol multimedia subsystem.

With the development of mobile communication, the spread of various high quality multimedia services using mobile terminals is increasing. Recently, technologies for internet multimedia services based on IP-based core networks have been developed. For example, the 3rd Generation Partnership Project (3GPP) is proceeding standardization on the ALL IP based core network to provide IP based multimedia services.

The 3GPP Internet Protocol Multimedia Subsystem (IMS) can be variously applied for IP-based applications such as video telephony and VoIP. Among these, a video call is a communication service in which a wireless terminal having a video capturing function transmits video data generated by capturing a user's appearance to the counterpart terminal together with audio data including voice, thereby using a combination of voice and video. .

However, since the user may not want to disclose his or her appearance to the other party, there is a demand for a service that allows a video call to be made without a user's appearance using appropriate video data. Accordingly, there is a need for a communication system capable of supporting such a service.

An object of the present invention is to provide an alternative video service for a video call based on the Internet protocol multimedia subsystem.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the alternative video service providing method according to an embodiment of the present invention comprises the steps of receiving a first media stream from a first terminal performing a video call, and instead of the video data included in the first media stream And transmitting a second media stream inserted with the replacement video to the second terminal.

In order to achieve the above object, the alternative video service providing system according to an embodiment of the present invention is a mobile communication network for establishing a session for a video call between the first terminal and the second terminal, and a first media received from the first terminal And a media processing server for transmitting a second media stream in which a substitute image is inserted instead of the video data included in the stream, to the second terminal.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

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

1 is a diagram illustrating an alternative video service providing system 100 according to an exemplary embodiment of the present invention. The illustrated alternative video service providing system 110 is based on an Internet Protocol Multimedia Subsystem (IMS). The alternative video service providing system 100 includes a call session control function (CSCF 110), a home subscriber server (HSS 120), and a media processing server 130.

The CSCF 110 may perform basic functions for session initiation protocol (SIP) based multimedia session control such as subscriber registration, authentication, service triggering, routing, various call control, address handling, and the like. . The CSCF 110 includes a proxy CSCF (P-CSCF 112), an interrogating-CSCF (I-CSCF 114), and a serving CSCF (S-CSCF 116). )).

The P-CSCF 112 is the first point where the terminal 140 connects to the alternative video service providing system 100. When a registration request message (REGISTER) is transmitted from the terminal 140, the P-CSCF 112 delivers it to the I-CSCF 114. The P-CSCF 112 stores the address of the S-CSCF 116 assigned by the I-CSCF 114 in the process of processing a registration request message, and then receives an session request message (INVITE) from the terminal 140. If so, it can be forwarded to the S-CSCF 116.

The I-CSCF 114 serves as a contact point for incoming calls to connect to subscriber stations in the network and a contact point with terminals of other network subscribers roaming in the network. The I-CSCF 114 obtains the address of the S-CSCF available from the HSS 120 in the subscriber registration process, and allocates the S-CSCF 116 to be in charge of actual registration with reference to this.

The S-CSCF 116 may register a subscriber with the HSS 120 when the registration request message is received from the I-CSCF 114 and obtain a service profile of the subscriber from the HSS 116. In addition, when the S-CSCF 116 receives the session request message of the terminal 140, the S-CSCF 116 checks the type of service to be provided to the terminal 140 using the service profile of the subscriber (the user of the terminal 140), and provides the same. Triggering on the media processing server 130 that processes the service to be performed may be performed. As will be described later in more detail, in the present invention, the media processing server 130 may provide an alternative video service.

The HSS 120 is a subscriber's master database, which stores and manages profile information, authentication and location related data, and provides information required by the I-CSCF 114 or the S-CSCF 116. In addition, the HSS 120 may include a function of a home location register (HLR).

The media processing server 130 processes the media stream transmitted from the terminal 140 when the terminal 140 performs a video call. In the present invention, processing the media stream may include relaying data transmitted between terminals to enable a video call. The media stream may include at least one of video data and audio data. Assuming a video call, the media stream preferably contains both video data and audio data.

According to an embodiment of the present invention, the media processing server 130 may provide an alternative video service. When providing an alternative video service, the media processing server 130 may replace the video data of the media stream transmitted from the terminal 140 with the replacement video. The substitute image may be a still image or a moving image. The media stream into which the substitute image is inserted may be transmitted to the counterpart terminal (not shown) that performs a video call with the terminal 140. The substitute image may be previously selected by the substitute image service subscriber from a plurality of video data stored in the media processing server 130 or a database interoperable with the media processing server 130. As shown in Table 1, the media processing server 130 may manage an information table that maps the subscriber's previously selected alternative video and subscriber information.

Table 1

Subscriber Information Alternate video Subscriber A 1930.avi Subscriber B 5403.jpg Subscriber C 3240.avi

In Table 1 and the following embodiments, the subscriber information may include information for identifying the subscriber, such as a phone number and subscriber ID used by the subscriber. Referring to Table 1, subscribers A and C selected the video file with the extension avi as the replacement image, and subscriber B selected the still image file with the extension jpg as the replacement image. If the subscriber A attempts to make a video call to the terminal 140, the media processing server 130 removes the video data captured by the terminal 140 from the media stream transmitted from the terminal 140 and the rest of the media stream. The data may be mixed with the video data identified as 1930.avi and streamed to the counterpart terminal having a video call with the terminal 140.

On the other hand, the replacement video service does not have to be continued from the start of the video call to the end of the video call. The media processing server 130 may stop or start the replacement video service at the request of the terminal 140.

First, whether to provide an alternative video service at the same time as the start of a video call may vary depending on the embodiment, and the subscriber may set this in advance. For example, if the media processing server 130 manages a table as shown in Table 2, subscriber A and subscriber B may be provided with an alternative video service from the start of the video call. In addition, in the case of subscriber C, the alternative video service is not provided when the video call is started, but if the subscriber C requests the alternative video service using the terminal 140 during the video call, the alternative video service may be provided thereafter.

[Table 2]

Subscriber Information Alternate video Whether to offer alternative video services with video call initiation Subscriber A 1930.avi O Subscriber B 5403.jpg O Subscriber C 3240.avi X

According to an embodiment of the present invention, it is also possible to set the type of the alternate video differently according to the counterpart of the video call. For this purpose, the media processing server 130 may manage the information table as shown in Table 3 below.

Table 3

Subscriber Information Video call Alternate video Subscriber A Subscriber F 1930.avi Member other than Member F 2041.avi Subscriber B All subscribers 5403.jpg

Referring to Table 3, when subscriber A makes a video call using subscriber video with subscriber F, video data of 1930.avi is used as the replacement video, and subscriber A makes a video call using subscriber video with other subscribers except subscriber B. In this case, video data called 2041.avi may be used as a substitute video. In addition, when subscriber B makes a video call using the substitute image, regardless of the call partner, still image data of 5403.jpg may be used as the substitute image.

According to an embodiment of the present invention, it is also possible to set the type of the alternate video differently according to the time zone using the video call. To this end, Table 4 shows an embodiment of an information table that can be managed by the media processing server 130.

Table 4

Subscriber Information Service time zone Alternate video Subscriber A 8:00 PM to 7:00 AM 1930.avi 7:00 am-8:00 pm 2041.avi Subscriber B All time zones 5403.jpg

Referring to Table 4, when subscriber A makes a video call using the alternative video in the time zone of 8:00 pm to 7:00 am, the video data of 1930.avi is used as the alternative video, and subscriber A is 7:00 am to 8 pm When a video call using an alternate video is performed in a time zone up to hr, video data of 2041.avi may be used as the alternate video. In addition, when subscriber B makes a video call using the substitute image, the still image data of 5403.jpg may be used as the substitute image regardless of the call time.

Embodiments combining two or more of the embodiments of the alternative video service described with reference to Tables 1 to 4 may be implemented. In addition, the present invention is not limited by the contents described with reference to Tables 1 to 4, and other types of embodiments similar or applied thereto should be construed as being included in the scope of the present invention.

The media processing server 130 in charge of such an alternative video service may include at least one of an application server (AS, not shown) and a multimedia resource function (MRF). The AS holds the service logic and can manage the types of services to be provided to subscribers. The MRF can directly process media data in conjunction with the AS. AS and MRF may follow the 3rd Generation Partnership Project (3GPP) IMS standard.

1 shows a P-CSCF 112, an I-CSCF 114, an S-CSCF 116, an HSS 120, and a media processing server 130 one by one, but this is an alternative video service providing system 100. The present invention is not limited to this because it is intended to describe the basic configuration. Therefore, the alternative video service providing system 100 may include a plurality of devices or servers shown in FIG. 1, and may further include a known device or server based on IMS. In addition, although not shown in FIG. 1, the terminal 140 includes a mobile communication network such as Code Division Multiple Access (CDMA), Wideband CDMA (WCDMA), Global System for Mobile communication (GSM), a Public Switched Telephone Network (PSTN), The alternative video service providing system 100 may be connected through a wired communication network such as an integrated services digital network (ISDN), or other known communication network. Hereinafter, a process of providing an alternative video service based on the IMS will be described.

First, the terminal 140 may perform a task of registering a subscriber in the alternative video service providing system 100, which is illustrated in FIG. 2.

The terminal 140 may transmit a registration request message to the P-CSCF 112 (S210). The registration request message may include a Uniform Resource Identifier (hereinafter referred to as a destination URI) indicating a destination domain, a URI of the terminal 140, an IP address of the terminal 140, and the like.

After receiving the registration request message from the terminal 140, the P-CSCF 112 may perform a DNS (Domain Name System) query operation (S215). Through the DNS query operation, the P-CSCF 112 may obtain the address of the I-CSCF 114. More specifically, in the DNS query operation, the P-CSCF 112 may transmit a DNS query message including a destination URI of the registration request message received from the terminal 140 to a DNS (not shown). . At this time, DNS selects an appropriate I-CSCF 114 by referring to a destination URI included in the DNS query message, and a DNS query response message including an address of the selected I-CSCF 114. May be transmitted to the P-CSCF 112.

The P-CSCF 112 having obtained the address of the I-CSCF 114 transmits a registration request message of the terminal 140 to the I-CSCF 114 (S220). The registration request message transmitted to the I-CSCF 114 may be a compilation of the registration request message received by the P-CSCF 112 from the terminal 140. Here, editing is a concept that includes adding, deleting, and changing information. For example, the registration request message sent to the I-CSCF 114 may include the address of the P-CSCF 112. An example of the address of the P-CSCF 112 is the URI of the P-CSCF 112. The address of the P-CSCF 112 may be used as a routing path when the S-CSCF 116 later wants to send a message to the terminal 140.

Upon receiving the registration request message from the P-CSCF 112, the I-CSCF 114 transmits a user authorization request (UAR) message to the HSS 120 (S225). The UAR message may include information about the capability of the terminal 140. Although omitted in FIG. 2, the operation of obtaining the address of the HSS 120 by the I-CSCF 114 may be performed before the process S225. Here, the I-CSCF 114 may obtain the address of the HSS 120 from an SLF (Server Locator Function, not shown).

The HSS 120 selects the S-CSCF 116 suitable for the capability of the terminal 140 by referring to the UAR message transmitted from the I-CSCF 114 and includes information about the selected S-CSCF 116. A user authorization answer message (UAA) message may be transmitted to the I-CSCF (S230) (S230).

The I-CSCF 114 may know the S-CSCF 116 that will process the registration request of the terminal 140 through the UAR message. If the S-CSCF 116 is confirmed, the I-CSCF 114 transmits a registration request message to the S-CSCF 116 (S235).

Thereafter, the S-CSCF 116 transmits a Server Assignment Request (SAR) message to the HSS 120 (S240).

The HSS 120 may transmit a Server Assignment Answer (SAA) message to the S-CSCF 116 as a response to the SAR message (S245). The SAA message may include the service profile of the user of the terminal 140, that is, the subscriber. The service profile may include various kinds of known information required to provide a service. According to an embodiment of the present invention, the service profile may include information indicating whether the subscriber has subscribed to the alternative video service (hereinafter, referred to as alternative video service subscription information). Preferably, the replacement video service subscription information may be included in an initial filter criterion (iFC) in the service profile.

Upon receiving the SAA message, the S-CSCF S116 stores the service profile and transmits a 200 OK response message to the I-CSCF 114 (S250). The 200 OK response message may include the address of the S-CSCF 116. An example of the address of the S-CSCF 116 may be a URI of the S-CSCF 116.

The I-CSCF 114 transmits a 200 OK response message to the P-CSCF 112 (S255). The P-CSCF 112 may store the address of the S-CSCF 116 included in the 200 OK response message. Of course, the manner in which the P-CSCF 112 obtains the address of the S-CSCF 116 is not limited thereto. For example, an embodiment of obtaining the address of the S-CSCF 116 from the I-CSCF 114 or the S-CSCF 116 is also possible.

Thereafter, the P-CSCF 112 transmits a 200 OK response message to the terminal 140 (S260).

After completing the registration process as shown in FIG. 2, the P-CSCF 112 may know the address of the S-CSCF 116 that will process the request of the terminal 140, and the S-CSCF 116 may determine the terminal. It is possible to retain the service profile of 140 and the routing path (address of P-CSCF 112) of terminal 140.

Hereinafter, an IMS (hereinafter referred to as a source IMS) for processing a request message output from a terminal (hereinafter referred to as a source terminal) requesting for session establishment for a video call and a terminal (hereinafter referred to as a destination) The operation of the IMS (hereinafter referred to as the called party IMS) that processes the request message to be received by the terminal will be described. The calling IMS and the called IMS may be the same IMS physically or logically or may be different IMS.

3 is a flowchart illustrating a call processing process of an originating IMS according to an embodiment of the present invention.

The source terminal 140-1 wishing to establish a session for the video call with the destination terminal may transmit a session request message to the P-CSCF 112-1 (S310).

When the session request message is received from the source terminal 140-1, the P-CSCF 112-1 transmits a 100 Trying response message to the source terminal 140-1 (S315). If the source terminal 140-1 has completed the subscriber registration operation as illustrated in FIG. 2, the P-CSCF 112-1 may use the S-CSCF (S-CSCF) to process the session request message of the source terminal 140-1. 116-1). If the address of the S-CSCF 116-1 is confirmed, the P-CSCF 112-1 may transmit a session request message to the S-CSCF 116-1 (S320).

When the session request message is transmitted from the P-CSCF 112-1, the S-CSCF 116-1 transmits a 100 Trying response message to the P-CSCF 112-1 (S325), and the source terminal 140-. The service profile of 1) is searched for (S330). According to an embodiment of the present invention, the S-CSCF 116-1 extracts subscriber information of the source terminal 140-1 from the session request message transmitted from the P-CSCF 112-1 in step S330. The existence of the service profile corresponding to the extracted subscriber information may be checked.

When the service profile of the source terminal 140-1 is found, the S-CSCF 116-1 may perform service triggering on the source terminal 140-1 (S335). This process is to determine which service the source terminal 140-1 will receive. If the source terminal 140-1 subscribes to the alternative video service, the S-CSCF 116-1 processes the media. The server 130 may request that the alternative video service be interworked.

The media processing server 130 may prepare to provide a substitute video service (S340), and transmit a response message indicating that it is ready to provide a substitute video service to the S-CSCF 116-1 (S345). In operation S340, the substitute image to be used for the media processing server 130 source terminal 140-1 may be searched for.

Meanwhile, the S-CSCF 116-1 may transmit a session request message to an S-CSCF (not shown) of the called party's IMS (S350). Of course, the session request message does not have to be sent directly from the S-CSCF 116-1 to the S-CSCF of the destination IMS, but may be relayed through another device or server.

When a positive response (hereinafter referred to as session response message) to the session request is received from the destination terminal (not shown) (S355), the S-CSCF 116-1 transmits it to the P-CSCF 112-1. (S360). In addition, the P-CSCF 112-1 forwards the session response message to the source terminal 140-1 (S365). When the session between the source terminal 140-1 and the destination terminal is established through this, the source terminal 140-1 may perform a video call with the destination terminal through the media processing server 130 (S370). In this case, the media processing server 130 may provide a substitute video service by processing the media data transmitted from the source terminal 140-1.

4 illustrates an embodiment of a process of providing an alternative video service by the media processing server 130.

When the replacement video service is requested, the media processing server 130 searches for the replacement video previously set by the subscriber (S410). Process S410 may correspond to process S340 of FIG. 3. Subscriber information of the source terminal 140-1 may be used when searching for a substitute image. According to an embodiment of the present invention, the media processing server 130 may use an information table as shown in Tables 1 to 4. It is possible.

Thereafter, when the media stream is transmitted from the source terminal 140-1, the media processing server 130 may replace the video data of the media stream with the substitute image found in step S410 (S420). In step S420, the media processing server 130 may separate the video data from the media stream and insert a substitute image into the media stream. Inserting the replacement video into the media stream may include mixing audio data or text data included in the media stream with the replacement video.

The media processing server 130 outputs a media stream including a substitute image (S430). The media stream output in step S430 may be transmitted to the destination terminal which performs a video call with the source terminal 140-1.

Although FIG. 4 has described the case in which the source terminal 140-1 uses the alternative video service, the destination terminal may also use the alternative video service by the same process.

According to an embodiment of the present invention, the mediator processing server 130 may provide an alternative video service using an alternative video to which the same encoding method as that of video data is applied in the media stream transmitted from the terminal 140. have. For example, if the media stream transmitted from the terminal 140 includes video data coded in the Moving Picture Experts Group 4 (MPEG4) scheme, the media processing server 130 may use the alternative image coded in the MPEG4 scheme. Alternative video services may be provided. Similarly, if the media stream transmitted from the terminal 140 includes video data coded by the H.263 method or the H.264 method, the media processing server 130 may correspond to the H.263 method or the H.264 method accordingly. An alternative video service may be provided using an alternative video coded in a manner. In this case, in step S420 of FIG. 4, the media processing server 130 checks whether the video data of the media stream received from the source terminal 140-1 is coded by which video coding scheme, and the identified video coding scheme is As the applied substitute image, the substitute image having the same content as the substitute image retrieved in step S410 may be used to replace the video data of the media stream. That is, the media processing server 130 may manage substitute images including the same contents but coded by different video coding schemes, and may select necessary substitute images.

According to an embodiment of the present invention, the media processing server 130 may stop the substitute video service at the request of the terminal 140, which will be described with reference to FIG. 5.

While performing a video call using a substitute video with the destination terminal through the media processing server 130, if the user requests to stop the substitute video service, the source terminal 140-1 may transmit the P-CSCF 112-1. In step S510, a message for requesting to stop the replacement video service is transmitted (hereinafter, referred to as a service stop request message).

The P-CSCF 112-1 may transmit a service stop request message to the S-CSCF 116-1 (S520), and the S-CSCF 116-1 may transmit it to the media processing server 130 again. (S530).

When the service stop request message is received, the media processing server 130 stops the replacement video service (S540). Since the replacement video service is stopped, the video call between the source terminal 140-1 and the destination terminal can be effectively continued. In this case, the media stream transmitted from the source terminal 140-1 may be transmitted to the destination terminal as it is.

Thereafter, the media processing server 130 may transmit a response message indicating that the substitute video service is stopped to the S-CSCF 116-1 (S550). The S-CSCF 116-1 may transmit a response message to the P-CSCF 112-1 (S560), and the P-CSCF 112-1 may transmit it to the source terminal 140-1 again ( S570).

On the other hand, it is also possible to resume the suspended alternative video service, an embodiment thereof is shown in FIG. The process of FIG. 6 may be performed in a state where a video call is made without using a substitute video.

If the user requests an alternative video service while performing a video call with the destination terminal through the media processing server 130, the source terminal 140-1 requests the P-CSCF 112-1 to resume the alternative video service. A message (hereinafter referred to as a service request message) may be transmitted (S610).

The P-CSCF 112-1 may transmit a service request message to the S-CSCF 116-1 (S620), and the S-CSCF 116-1 may transmit it back to the media processing server 130 ( S630).

When the service request message is received, the media processing server 130 provides a substitute video service (S640). In this case, the substitute image may be inserted into the media stream instead of the video data included in the media stream transmitted from the source terminal 140-1, and the media stream into which the substitute image is inserted may be transmitted to the destination terminal.

Thereafter, the media processing server 130 may transmit a response message indicating that the substitute video service is provided to the S-CSCF 116-1 (S650). The S-CSCF 116-1 may transmit a response message to the P-CSCF 112-1 (S660), and the P-CSCF 112-1 may transmit it to the source terminal 140-1 again ( S670).

7 is a flowchart illustrating a call processing procedure of a called party IMS according to an embodiment of the present invention.

When the session request message is normally transmitted to the S-CSCF 116-2 of the destination IMS according to the request of the source terminal (S710), the S-CSCF 116-2 sends a 100 Trying response message (S715). Process S710 may correspond to process S350 of FIG. 3.

Thereafter, the S-CSCF 116-2 may retrieve the service profile of the destination terminal 140-2 (S720). According to an embodiment of the present invention, in step S720, the S-CSCF 116-2 extracts the subscriber information of the destination terminal 140-2 from the session request message, and the existence of the service profile corresponding to the extracted subscriber information. You can check whether or not.

When the service profile of the destination terminal 140-2 is found, the S-CSCF 116-2 may perform service triggering on the destination terminal 140-2 (S725). This process is to determine which service the destination terminal 140-2 will receive. If the destination terminal 140-2 is subscribed to the alternative video service, the S-CSCF 116-2 is the media processing server. The server 130 may request the alternative video service to interwork.

The media processing server 130 may prepare to provide a substitute video service (S730), and transmit a response message indicating that it is ready to provide a substitute video service to the S-CSCF 116-1 (S735). In operation S730, an alternative image to be used for the destination terminal 140-2 of the media processing server 130 may be searched for.

After the service triggering, the S-CSCF 116-2 may transmit a session request message to the P-CSCF 112-2 (S740). The P-CSCF 112-2 may send a 100 Trying response message to the S-CSCF 116-2 (S745), and transmit a session request message to the destination terminal 140-2 (S750).

If the user of the destination terminal 140-2 accepts the video call with the source terminal, the destination terminal 140-2 may transmit a session response message to the P-CSCF 112-2 (S755).

When the session response message is received from the destination terminal 140-2, the P-CSCF 112-2 may transmit it to the S-CSCF 116-2 (S760), and the S-CSCF 116-2 may This may be transmitted to the S-CSCF (not shown) of the calling IMS (S765). Process S765 of FIG. 7 may correspond to process S355 of FIG. 3.

If a session is established between the source terminal and the destination terminal 140-2 through this, the destination terminal 140-2 may perform a video call with the source terminal through the media processing server 130 (S770). In this case, the media processing server 130 may provide a substitute video service by processing the media data transmitted from the destination terminal 140-2. Various embodiments of providing the alternative video service to the source terminal described above may be equally or similarly applied to the destination terminal.

Embodiments described above may comply with the 3GPP IMS standard. Accordingly, various call processing procedures specified in the 3GPP IMS standard are applicable for the implementation of the present invention.

1 to 7 have been described as providing an alternative video service based on IMS, but the present invention is not limited thereto. Therefore, it is possible to implement an embodiment for providing an alternative video service even if it is not based on IMS. An example thereof will be described with reference to FIG. 8.

8 is a diagram illustrating an alternative video service providing system 800 according to an embodiment of the present invention. The illustrated alternative video service providing system 800 includes a mobile communication network 810 and an intelligent network 820.

The mobile communication network 810 may establish a communication session between the source terminal 140-1 and the destination terminal 140-2. That is, the mobile communication network 810 may play a role of relaying a media stream for a video call between the source terminal 140-1 and the destination terminal 140-2.

The mobile communication network 810 may be a synchronous mobile communication network or an asynchronous mobile communication network. An embodiment of a synchronous mobile communication network may be an EVDO evolution data only revision (A) communication network, and as an embodiment of an asynchronous mobile communication network, a WCDMA communication network may be used.

Although not shown in FIG. 8, mobile communication network 810 may include a base station, a base station controller, and a switch. If the mobile communication network 810 is an EVDO rA communication network, the base station, the base station controller, and the exchange are to be understood as a base station transformer subsystem (BTS), a base station controller (BSC), and a synchronous mobile switching center (MSC), respectively. If the mobile communication network 810 is a WCDMA communication network, the base station, the base station controller, and the exchange may be understood as a Node B, a Radio Network Controlloner (RNC), and an asynchronous MSC, respectively. Since the specific configuration and function of the mobile communication network 810 are already known, a description thereof will be omitted.

The intelligent network 820 includes a media processing server 822. The media processing server 822 may replace the video data of the media stream transmitted from the terminal with the substitute video previously selected by the subscriber in order to provide a substitute video service as in the media server 130 illustrated in FIG. 1. Accordingly, if an alternative video service is required during a video call between the source terminal 140-1 and the destination terminal 140-2, the media stream transmitted by the source terminal 140-1 or the destination terminal 140-2 is It is delivered to the intelligent network 820 via the mobile communication network 810, processed by the media processing server 822 of the intelligent network 820, and then through the die mobile communication network 810, the destination terminal 140-2 or the source terminal ( 140-1).

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to the method and system for providing an alternative video service based on the mobile communication network of the present invention as described above, an alternative video service can be used more effectively during a video call.

Claims (15)

Receiving a first media stream from a first terminal making a video call; Transmitting a second media stream in which a substitute image is inserted in place of video data included in the first media stream, to a second terminal; And Stopping the transmission of the second media stream and transmitting the first media stream to the second terminal when a message requesting to stop the replacement video service is transmitted from the first terminal. How we deliver the service. The method of claim 1, And the substitute image is a still image or a moving image. The method of claim 1, The type of the replacement video is determined according to at least one of a subscriber using the second terminal and a time zone during which the video call is performed. delete The method of claim 1, The transmitting step is performed when the alternative video service is requested, alternative video service providing method. The method of claim 1, And establishing a session for a video call between the first terminal and the second terminal in response to a request of the first terminal. The method of claim 1, And establishing a session for a video call between the second terminal and the first terminal in response to a request of the second terminal. The method of claim 1, And the video call is based on an internet protocol multimedia subsystem. A mobile communication network for establishing a session for a video call between a first terminal and a second terminal; And a media processing server configured to transmit a second media stream in which a substitute image is inserted instead of video data included in the first media stream received from the first terminal, to the second terminal. When the message for requesting to stop the alternative video service is received from the first terminal, the media processing server stops transmitting the second media stream and transmits the first media stream to the second terminal. Service delivery system. The method of claim 9, And the substitute image is a still image or a moving image. The method of claim 9, The type of the substitute image is determined according to at least one of a subscriber using the second terminal and a time zone during which the video call is performed. delete The method of claim 9, And the media processing server transmits the second media stream to the second terminal when a message requesting a replacement video service is received from the first terminal. The method of claim 9, And the mobile communication network forms a session for a video call between the first terminal and the second terminal in response to a request of the first terminal. The method of claim 9, And the mobile communication network forms a session for a video call between the second terminal and the first terminal at the request of the second terminal.

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