KR20060133609A - System and method for providing multimedia contents service by using heterogeneous wireless network - Google Patents

Abstract

A multimedia contents service system using heterogeneous wireless networks and a method thereof are provided to effectively prevent the disconnection of a multimedia contents service by providing multimedia contents to a mobile terminal through the present wireless network by using a contents buffering technique when handoff is progressing between different kinds of wireless networks. A multimedia contents service system using heterogeneous wireless networks comprises a mobile terminal(302), a wireless network group(304), a contents transmission management server(306), a contents service server(308), a multimedia contents DB(310), an encoder(312), and a converter(314). The wireless network group(304) comprises a CDMA wireless network(3041), a WiBro wireless network(3043), a WCDMA wireless network(3045), etc. The contents transmission management server(306) manages the protocols and states of the wireless networks of the wireless network group(304). The contents service server(308) modifies multimedia contents to be provided to mobile terminals according to wireless networks suitably, creates modified multimedia contents, and stores them in the multimedia contents DB(310).

Description

System and method for multimedia content service using heterogeneous wireless network {SYSTEM AND METHOD FOR PROVIDING MULTIMEDIA CONTENTS SERVICE BY USING HETEROGENEOUS WIRELESS NETWORK}

1 is a schematic block diagram of a system for providing a multimedia content service to any mobile terminal in a conventional wireless Internet environment;

2 is a flowchart illustrating a process of serving multimedia content to any mobile terminal in a wireless Internet environment according to a conventional method;

3 is a block diagram of a multimedia content service system using a heterogeneous wireless network according to an embodiment of the present invention;

4 is a flowchart illustrating a process of serving multimedia content to an arbitrary mobile terminal using a heterogeneous wireless network in a wireless Internet environment according to a preferred embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

302: mobile terminal 304: wireless network group

306: content delivery management server 308: content service server

310: multimedia content DB 312: encoder

314 converter 3041 CDMA wireless network

3043: WiBro wireless network 3045: WCDMA wireless network

The present invention relates to an on-demand multimedia service technique using a heterogeneous wireless network, and more particularly, video on demand (VOD) / (Music On Demand) on a mobile terminal using a heterogeneous wireless network in a wireless internet environment. And a multimedia content service system and method using heterogeneous wireless networks suitable for serving MOD.

As is well known, advances in communication and computer technologies are increasing interest in the multimedia field, particularly in VOD / MOD applications. The VOD / MOD system compresses digital data such as video / audio on demand into individual or combined multimedia information and stores it in a database linked to the VOD / MOD server. It's a composite of cable television and video cassette recorder (VCR) technology that delivers video and / or audio.

This VOD / MOD system is based on a simple video / audio order form that supports only the video / audio selection through prior knowledge of the subscriber when the subscriber requests the server for the video data and audio data provided by the VOD / MOD server. A more complex form of video that allows subscribers to navigate directly through server-selected menus, allowing subscribers 'needs to be closely communicated to the server so that they can always handle subscribers' requests instantly and interactively. It ranges from music service.

In addition, the Internet service provides a variety of high-quality multimedia VOD / MOD content (video file / audio file, etc.) to the mobile terminal in accordance with the development of real-time video transmission technology, advanced technologies such as location tracking, voice recognition. The mobile terminal for the VOD / MOD content service is equipped with a WAP (Wireless Application Protocol) browser and a VOD / MOD player, and the VOD / MOD content data can be transferred from a server through a wireless data network (or wireless internet network). It can be downloaded (or streamed) and played back.

1 is a schematic block diagram of a system for providing a multimedia content service to a mobile terminal in a wireless Internet environment. The mobile terminal 102, the base station 104, the PDSN 106, which is a wireless data network, and the IP network 108. ), A WAP server 110, a download server 112, a DB 114 storing multimedia VOD / MOD content, and the like.

A process of serving multimedia content to a mobile terminal in a content service system having the above configuration will be described with reference to FIG. 2.

2 is a flowchart illustrating a process of serving multimedia content (eg, VOD / MOD content) to an arbitrary mobile terminal in a wireless Internet environment according to a conventional method.

Referring to FIG. 2, when a user runs a WAP browser on a mobile terminal 102 owned by the user to receive VOD / MOD content and selects a WAP server connection from the VOD / MOD service menu of the WAP browser, The terminal 10 is connected to the WAP server 110 via a wired or wireless network leading to the base station 104, the PDSN 106, and the IP network 108 (step 202).

In response, the WAP server 110 retrieves WAP page data having a VOD / MOD content menu from the connected mobile terminal 102 and transmits the WAP page data to the corresponding mobile terminal 102 through a wired or wireless network. In this case, the mobile terminal 102 receives and stores a URL (Uniform Resource Protocol) address of each content included in the content menu.

Accordingly, the user may view the VOD / MOD content menu page displayed through the display panel of the mobile terminal 102 to search for the desired content or to request a download service for the retrieved arbitrary content (step 204).

Then, when the user selects the content to receive the download service, the URL request of the selected content is transmitted to the WAP server 110 through the wired / wireless network (base station 104, PDSN 106, IP network 108).

In response, the WAP server 110 transmits detailed information of the corresponding content to a WAP browser of the mobile terminal 102 through a wired / wireless network using a designated WML (Wireless Markup Language). Accordingly, the WAP browser of the mobile terminal 102 receiving the WML is assigned a fast channel in a manner of changing a mux option based on a MO (Mux Option) value received from the WAP server 110.

Thereafter, the mobile terminal 102 interrupts the WAP session with the WAP server 110 connected through the IP network 108 to terminate the connection, and receives the WML received from the WAP server 110 through the WAP browser. Access to the download server 112 via the IP network 108 using the URL having the location and file name of the content in the detailed information of (step 206).

Next, the mobile terminal 102 requests the downloaded download server 112 to download the content selected by the user using a protocol such as Delivery Multimedia Integration Framework (DMIF), which is a transmission protocol. (Step 208). At this time, the display panel of the mobile terminal 102 is currently connected to the download server 112 while displaying various content-related information (eg, title of the content) through a script such as WML received from the WAP server 110. Is displayed.

Subsequently, when download and play preparation are completed in the player of the mobile terminal 102, a download / play command is transmitted through the base station 104, the PDSN 106, and the IP network 108 using a protocol such as DMIF. 112). In response, the download server 112 sends a recognition command for a protocol such as DMIF and accesses the selected multimedia content, for example VOD / MOD content, in conjunction with the multimedia content DB 114 to access the IP network 108 and the PDSN 106. And the mobile station 102 via the base station 104 (step 210).

As a result, the mobile terminal 102 receives the recognition command and receives the selected content by downloading or streaming and storing the selected content in the internal memory. In this case, the mobile terminal 102 may play the content through a VOD / MOD player while being provided with a download or streaming content.

However, the above-described VOD / MOD content service method on the wireless Internet according to the related art is only possible in the same wireless network, and is a heterogeneous wireless network, that is, W-CDMA (Wideband Code Division Multiple Access, WCDMA), or wireless broadband Internet. Service could not be provided between wireless networks such as Internet, WiBro) and CDMA.

For example, in the conventional method, when any mobile terminal receives a multimedia content service (downloading or streaming) through a CDMA wireless network, when the mobile network changes, that is, a WiBro wireless network or a WCDMA wireless network service area, the content currently being served. There is a problem that the service is blocked. This is because the multimedia contents are contents optimized for the CDMA wireless network but not optimized for the WiBro wireless network or the WCDMA wireless network.

Therefore, considering the various service needs of users, the emergence of a technique that can naturally receive multimedia content (i.e. without interruption of content service) while crossing heterogeneous wireless networks is urgently required, but at present There is no suggestion of any technique.

Accordingly, the present invention is to solve the problems of the prior art described above, heterogeneous which can serve multimedia content while interworking heterogeneous wireless networks through a technique for transforming each multimedia content to be optimized for each wireless network. Its purpose is to provide a multimedia content service system and method using a wireless network.

Another object of the present invention is to modify each multimedia contents to be optimized for each wireless network, and heterogeneous to service multimedia contents while interworking heterogeneous wireless networks through a technique for monitoring the status of each mobile terminal in real time. A multimedia content service system and method using a wireless network are provided.

The present invention according to one aspect of the present invention for achieving the above object is a system for servicing multimedia content to a mobile terminal in a wireless network system including a plurality of heterogeneous wireless networks. First server means for generating a plurality of modified multimedia contents respectively corresponding to the heterogeneous wireless networks of the network, means for storing the generated plurality of modified multimedia contents, and a current wireless network in service when the multimedia contents are in service. Means for detecting a change to another heterogeneous wireless network, and in response to a service request from any mobile terminal, extracting multimedia content corresponding to the wireless network stored in the storage means and transmitting the same to the mobile terminal. And change of the wireless network is detected. And a second server means for extracting the modified multimedia contents corresponding to the other wireless network stored in the storage means and transmitting the modified multimedia content to the mobile terminal through the other wireless network. .

According to another aspect of the present invention, there is provided a method of serving multimedia content to a mobile terminal in a wireless network system including a plurality of heterogeneous wireless networks, each time multimedia content to be provided is provided. The first process of generating and storing a plurality of modified multimedia contents each capable of coping with a plurality of heterogeneous wireless networks, and when there is a service request from any mobile terminal, a wireless network currently connected among the plurality of modified multimedia contents stored previously. A second process of extracting modified multimedia contents corresponding to the service and serving the service through the wireless network; and a third process of detecting when the corresponding wireless network is changed to a heterogeneous wireless network; When a change is detected, of the stored plurality of modified multimedia contents A fourth process of extracting other modified multimedia contents corresponding to different wireless networks and transmitting them to the mobile terminal through the other wireless network; and whenever the current wireless network is changed to any other wireless network, the third process. A multimedia content service method using a heterogeneous wireless network including a fifth process of repeatedly performing a process and a fourth process is provided.

According to another aspect of an aspect of the present invention, there is provided a system for servicing multimedia contents to a mobile terminal in a wireless network system including a plurality of heterogeneous wireless networks, the means for storing respective multimedia contents to be serviced. And means for detecting whether the current wireless network in service is changed to another heterogeneous wireless network when the multimedia content is a service, and corresponding radio stored in the storage means in response to a service request from any mobile terminal. First server means for retrieving the multimedia contents or modified multimedia contents corresponding to the network and transmitting them to the mobile terminal and requesting the provision of the modified multimedia contents corresponding to the other wireless network when the change of the wireless network is detected; And in response to the service request, Extract the service-selected multimedia content from the market means and deliver it to the first server means, transform the service-selected multimedia content into multimedia content corresponding to the other wireless network in response to a request from the first server means; And a second server means for providing the modified multimedia content to the first server means.

According to another aspect of another aspect of the present invention, there is provided a method for servicing multimedia content to a mobile terminal in a wireless network system including a plurality of heterogeneous wireless networks, each time a multimedia content to be serviced is generated. A second process of storing a selected multimedia content among a plurality of pre-stored modified multimedia contents and serving a service through a corresponding wireless network when there is a service request from an arbitrary mobile terminal; A third process of detecting when a change is made to another heterogeneous wireless network; a fourth process of transforming the selected multimedia content into multimedia content corresponding to the other wireless network when the change of the wireless network is detected; Transform multimedia content through the other wireless network A fifth process of transmitting to the arbitrary mobile terminal and a sixth process of repeatedly performing the third to fifth processes whenever the mobile terminal is changed from the current wireless network to any other wireless network; It provides a multimedia content service method using a heterogeneous wireless network.

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

First, a key technical aspect of the present invention is to provide multimedia contents (eg, VOD / MOD contents) to be serviced, unlike the above-described conventional technique of providing multimedia contents to a mobile terminal only within a single wireless network in a wireless Internet environment. Each mobile network is modified to be optimized for each wireless network (eg, CDMA wireless network, WiBro wireless network, WCDMA wireless network, etc.), and the current status of the mobile terminal receiving the multimedia service is monitored in real time. When the mobile network is changed from wireless network to other wireless network (heterogeneous wireless network), it detects the change and provides the modified multimedia contents optimized for the other wireless network to the mobile terminal through another wireless network. The object of the invention can be easily achieved.

3 is a block diagram of a multimedia content service system using a heterogeneous wireless network according to an exemplary embodiment of the present invention. The mobile terminal 302, the wireless network group 304, the content delivery management server 306, and the content service server are shown in FIG. 308, multimedia content DB 310, encoder 312, and converter 314. Here, the radio network group 304 includes, for example, a CDMA radio network 3041, a WiBro radio network 3043, a WCDMA radio network 3045, and the like.

Referring to FIG. 3, the mobile terminal 302 is, for example, a terminal equipped with a WAP browser and capable of receiving multimedia content such as VOD / MOD contents. In this figure, only one terminal is exemplarily illustrated. However, in general, it refers to an unspecified number of mobile terminals belonging to a wireless network environment.

Therefore, users can receive a desired multimedia content (eg, VOD / MOD content, etc.) by service (downloading or streaming) by connecting to a remote content service server using a mobile terminal equipped with a WAP browser.

In addition, in order to realize the present invention, the mobile terminal 102 changes its wireless network to another wireless network, for example, while it is currently connected to a CDMA wireless network while its multimedia content is being serviced. It is checked whether it is changed to a WiBro wireless network or a WCDMA wireless network, and when a wireless network change is detected, a wireless network change detection signal is generated and transmitted to a transmission management server 306 to be described later through the currently connected wireless network. do. This is for real-time service interworking to another wireless network that has been changed in response to the wireless network change according to the present invention.

Next, the radio network group 304 includes, for example, a CDMA radio network 3041, a WiBro radio network 3043, a WCDMA radio network 3045, etc. each having a plurality of base stations, a base station controller, and the like. In addition, the mobile station selectively provides multimedia content services such as voice communication service and VOD / MOD content to unspecified mobile terminals belonging to its service area. In addition, each wireless network in the wireless network group 304 provides a function such as receiving the wireless network change detection signal from the mobile terminal 302 and transmitting it to the content delivery management server 306 described later.

In addition, the content delivery management server 306 checks the protocol and wireless network status of heterogeneous wireless networks belonging to the wireless network group 304, such as CDMA wireless network 3041, WiBro wireless network 3043, and WCDMA wireless network 3045. It provides functions such as management (ie, activation or deactivation of the wireless network, etc.), and multimedia services such as VOD / MOD provided through the content service server 308 to request services through any wireless network. It provides a function such as providing to the mobile terminal.

For example, the content delivery management server 306 detects when a wireless network change detection signal is provided from a mobile terminal currently receiving a multimedia content service through a wireless network (for example, a CDMA wireless network). Requests modified multimedia contents optimized for the changed wireless network (eg, WiBro wireless network) by transmitting the changed wireless network information to the service server 308, and deactivates the CDMA wireless network and simultaneously connects the WiBro wireless network to the service. State to enable handover between heterogeneous wireless networks, and transmit the modified multimedia contents received from the content service server 308 to the corresponding mobile terminal through the activated modified wireless network, for example, the WiBro wireless network 3043. to provide.

In addition, when the content delivery management server 306 performs a handoff between heterogeneous wireless networks as described above, a disconnection phenomenon (ie, a disconnection phenomenon due to handoff) of multimedia content that is currently being serviced to the mobile terminal occurs. To buffer the multimedia content, for example, to receive and buffer multimedia content, such as VOD / MOD, that can be serviced through a currently serving wireless network (CDMA wireless network) from the content service server 308, and to buffer the CDMA wireless network. While the handoff from the 3041 to the WiBro wireless network 3043 is in progress, the multimedia content is provided to the mobile terminal through the CDMA wireless network 3041, and the content service server 308 when the handoff between heterogeneous wireless networks is terminated. Optimized for the WiBro wireless network delivered from the) to transmit the modified multimedia content to the mobile terminal through the WiBro wireless network (3043) do.

That is, while the handoff is in progress, the CDMA wireless network 3041 is maintained as it is to provide multimedia contents, and when the handoff is completed, the multimedia contents modified and optimized for the wireless network through the WiBro wireless network 3043 are completed. To provide. Therefore, in the present invention, since the content transmission management server 306 buffers the multimedia content when the handoff is performed between heterogeneous wireless networks, the multimedia content service due to the handoff between the heterogeneous wireless networks is reliably prevented. Can be.

Meanwhile, the content service server 308 generates a plurality of modified multimedia contents by modifying each of the multimedia contents to be serviced to an unspecified mobile terminal so as to be bonded to heterogeneous wireless networks, according to the present invention. A plurality of modified multimedia contents are stored in the multimedia contents DB 310.

For example, assuming that a multimedia content called AAA is inputted, the content service server 308 uses WiBro and a modified multimedia content of AAA-1 suitable for a CDMA wireless network so that the content of AAA can be optimized for each heterogeneous wireless network. Generates the modified multimedia content of AAA-2 suitable for the wireless network and the AAA-3 suitable for WCDMA wireless network, and the three modified multimedia contents generated corresponding to one multimedia content in the multimedia content DB 310. Save it. That is, the present invention generates and stores three modified multimedia contents that can correspond to heterogeneous wireless networks corresponding to one multimedia content.

Herein, the multimedia contents provided to the content service server 308 are provided by VOD information providers corresponding to broadcast information, audio information, video recorder, etc., and are encoded through the encoder 312 or externally input and converted into a converter ( VOD content and MOD content (eg, content in a form of wireless transmission) provided through 314. In this case, the encoder 312 is responsible for encoding the provided content in a wireless transmission possible form.

In addition, the content service server 308 withdraws the multimedia content selected by the user from the multimedia content DB 310 when the mobile terminal requests service of the multimedia content from any mobile terminal, and is currently connected to the content delivery management server 306. The modified multimedia contents corresponding to the multimedia contents currently being serviced (ie, modified multimedia optimized for other modified wireless networks) when the wireless network is transmitted to the corresponding mobile terminal through the wireless network and the notification of the wireless network change is received from the content delivery management server 306. Content) and the like to the content delivery management server 306 to provide a function.

Accordingly, according to the multimedia content service system of the present invention, the modified multimedia contents optimized for heterogeneous wireless networks are prepared and prepared for each multimedia content in advance, and the handoff between heterogeneous wireless networks is monitored by monitoring the current state of the mobile terminal. By selecting and providing modified multimedia contents that can cope with heterogeneous wireless networks that change when they occur, it is possible to provide users with seamless multimedia contents services regardless of the type of wireless network in the wireless Internet environment, thereby effectively satisfying users' various service needs. Can be satisfied.

Meanwhile, in the preferred embodiment of the present invention, when the multimedia content to be provided is provided, the content service server generates previously modified multimedia contents corresponding to heterogeneous wireless networks for each content and stores them in a database, but the present invention has been described. However, the present invention is not necessarily limited thereto. When a handoff occurs between heterogeneous wireless networks without generating and storing a plurality of modified multimedia contents capable of responding to a plurality of heterogeneous wireless networks in advance, a content service is provided. Of course, the server may be configured to transform the multimedia content currently in service into a multimedia content optimized for another wireless network in real time to be serviced.

Of course, this requires that the content service server have a built-in device (hardware) or algorithm (software) capable of transforming the multimedia content into multimedia content compatible with other wireless networks in real time. Therefore, in this case, since a large amount of modified multimedia content to be stored in the database does not occur, the side effect of increasing the utilization efficiency of the database storing the multimedia content may be further obtained.

In addition, although a preferred embodiment of the present invention provides a heterogeneous wireless network, a CDMA wireless network, a WiBro wireless network, and a WCDMA wireless network, the present invention is not necessarily limited to these wireless networks. It will be clear that any wireless network other than the network can be selectively applied.

Moreover, in the preferred embodiment of the present invention, the VOD / MOD content has been described as an example of the multimedia content, but the present invention is not necessarily limited thereto, and those skilled in the art will likewise have any content other than the VOD / MOD content. It will be clear that it can be applied.

Next, a process of serving multimedia content using a heterogeneous wireless network according to the present invention using a multimedia content service system having the above-described configuration will be described.

4 is a flowchart illustrating a process of serving multimedia content to an arbitrary mobile terminal using a heterogeneous wireless network in a wireless Internet environment according to a preferred embodiment of the present invention.

Referring to FIG. 4, the content delivery management server 306 checks whether an arbitrary mobile terminal accesses its own server and requests a service of multimedia content such as VOD / MOD while performing a service standby mode (step). If the check in 402, 404, 406 and step 406 determines that any mobile terminal has requested the service, the content delivery management server 306 notifies the content service server 308 of this.

Next, in response to the service request notification from the content delivery management server 306, the content service server 308 fetches a menu page including a plurality of multimedia content selection items and delivers it to the content delivery management server 306. Then, the content delivery management server 306 transmits the menu page to the mobile terminal through the currently connected wireless network, so that the menu page is displayed on the WAP browser of the mobile terminal (step 408).

Accordingly, the mobile terminal user can search for desired content or select content to be serviced from a menu page displayed through the display panel of the terminal (step 410). The user can select any multimedia content (eg, VOD / MOD). Content), the content selection information is transferred to the content service server 308 via the wireless network and the content delivery management server 306 (step 412).

In response, the content service server 308 retrieves the multimedia content DB 310 to retrieve the corresponding multimedia content for which the user has requested a service, and the retrieved multimedia content is transferred to the content delivery management server 306 and the corresponding wireless network. And transmits to the mobile terminal (step 414). Therefore, the multimedia content selected by the user is downloaded or streamed through the corresponding mobile terminal, so that the user is provided with the content service requested by the user.

Next, the mobile terminal checks whether the mobile terminal is changed to a heterogeneous wireless network (WiBro wireless network) environment other than the wireless network (for example, CDMA wireless network) environment to which it is currently connected (step 416). If it is detected that the change from the current wireless network to another heterogeneous wireless network, the mobile terminal generates a signal for notifying the corresponding wireless network change detection and transmits a content transmission management server through the corresponding wireless network currently connected ( 306) (step 418).

Accordingly, when the content delivery management server 306 is notified of the change of the wireless network from the mobile terminal, the content delivery management server 306 delivers the changed heterogeneous wireless network information to the content service server 308 and simultaneously buffers the multimedia content. Ask for the offer. Here, buffering means buffering multimedia content currently being serviced through the wireless network and providing the same to the mobile terminal while the handoff is performed from the current wireless network to another heterogeneous wireless network. The buffering service is to prevent a service interruption (disruption) of multimedia content in service due to heterogeneous wireless network handoff.

That is, the content delivery management server 306 starts the buffering service while the handoff between the heterogeneous wireless networks is in progress after receiving the radio network change detection notification (step 420), and the handoff between the heterogeneous wireless networks is completed (ie, If it is determined that the CDMA wireless network is deactivated and the WiBro wireless network is activated (step 422), the content delivery management server 306 provides the content service server 308 to provide modified multimedia content that is compatible with other heterogeneous wireless networks. (Step 424).

In response, the content service server 308 searches the multimedia content DB 310 to retrieve the modified multimedia content corresponding to the different heterogeneous wireless networks, and sends the extracted modified multimedia content to the content delivery management server 306. To pass.

Accordingly, the content delivery management server 306 transmits the modified multimedia content to the mobile terminal through another heterogeneous wireless network (eg, WiBro wireless network). To this end, in the multimedia contents DB 310, a plurality of modified multimedia contents each corresponding to a plurality of heterogeneous wireless networks corresponding to one multimedia content are generated and stored in advance. That is, each time a new multimedia content such as VOD / MOD is input through the encoder 312 or the converter 314 in the content service server 308, the content service server 308 may correspond to a plurality of heterogeneous wireless networks, respectively. To generate and store the multimedia content in the multimedia content DB (310).

As a result, the modified multimedia contents corresponding to the multimedia contents selected by the user (multimedia contents optimized to correspond to the changed heterogeneous wireless network) are downloaded or streamed through the corresponding mobile terminal, so that the user provides the content service requested by the user. (Step 426).

Therefore, according to the multimedia content service scheme of the present invention, modified multimedia contents optimized for heterogeneous wireless networks are prepared and prepared for each multimedia content in advance, and handoff between heterogeneous wireless networks is monitored by monitoring the current state of the mobile terminal. By selecting and providing modified multimedia contents that can cope with heterogeneous wireless networks that change when they occur, it is possible to provide users with seamless multimedia contents services regardless of the type of wireless network in the wireless Internet environment, thereby effectively satisfying users' various service needs. Can be satisfied.

Meanwhile, in the preferred embodiment of the present invention, when the multimedia content to be provided is provided, the content service server generates previously modified multimedia contents corresponding to heterogeneous wireless networks for each content and stores them in a database, but the present invention has been described. However, the present invention is not necessarily limited thereto. When a handoff occurs between heterogeneous wireless networks without generating and storing a plurality of modified multimedia contents capable of responding to a plurality of heterogeneous wireless networks in advance, a content service is provided. Of course, the server may be configured to transform the multimedia content currently in service into a multimedia content optimized for another wireless network in real time to be serviced.

Of course, this requires that the content service server have a built-in device (hardware) or algorithm (software) capable of transforming the multimedia content into multimedia content compatible with other wireless networks in real time. Therefore, in this case, since a large amount of modified multimedia content to be stored in the database does not occur, the side effect of increasing the utilization efficiency of the database storing the multimedia content may be further obtained.

In the above description, the present invention has been presented and described with reference to preferred embodiments. However, the present invention is not necessarily limited thereto, and a person having ordinary skill in the art to which the present invention pertains can make various modifications without departing from the technical spirit of the present invention. It will be readily appreciated that branch substitutions, modifications and variations are possible.

As described above, the multimedia content service scheme of the present invention is different from the above-described conventional technology of providing multimedia content to a mobile terminal only within a single wireless network in a wireless Internet environment. Are stored in a manner that is optimized for each heterogeneous wireless network, and when the mobile terminal is changed from the current wireless network to another heterogeneous wireless network by monitoring the current state of the mobile terminal receiving the multimedia service in real time. By detecting this and fetching the modified multimedia contents optimized for the other wireless network that is changed and serving the mobile terminal through the other wireless network, it is possible to effectively meet various service needs of users.

In addition, the multimedia content service technique of the present invention, when handoff between the heterogeneous wireless network is in progress by using the content buffering technique to provide the multimedia content to the mobile terminal through the current wireless network, hand between heterogeneous wireless network The interruption of the multimedia content service due to the off can be effectively prevented.

Claims (15)

A system for servicing multimedia content to a mobile terminal in a wireless network system including a plurality of heterogeneous wireless networks, First server means for respectively generating a plurality of modified multimedia contents respectively corresponding to the plurality of heterogeneous wireless networks for each of the multimedia contents to be serviced; Means for storing the generated plurality of modified multimedia contents; Means for detecting whether the current wireless network in service is changed to another heterogeneous wireless network when the multimedia content is in service; In response to a service request from any mobile terminal, the multimedia content corresponding to the wireless network stored in the storage means is fetched and transmitted to the mobile terminal, and when the wireless network change is detected, Second server means for extracting the modified multimedia contents corresponding to the stored other wireless network and transmitting the same to the mobile terminal through the other wireless network; Multimedia content service system using a heterogeneous wireless network including a. The method of claim 1, The plurality of heterogeneous wireless networks, at least two of the CDMA wireless network, WiBro wireless network and WCDMA wireless network, characterized in that the multimedia content service system using a heterogeneous wireless network. The method of claim 1, The multimedia content is a multimedia content service system using a heterogeneous wireless network, characterized in that the VOD / MOD content. The method of claim 1, The wireless network change is detected by a mobile terminal receiving the multimedia content and is notified to the second server means. The method of claim 1, The corresponding multimedia content or the modified multimedia content is withdrawn from the storage means via the first server means and provided to the second server means, the multimedia content service system using a heterogeneous wireless network. The method according to any one of claims 1 to 5, When the change of the wireless network is detected, the second server means buffers and transmits multimedia content corresponding to the current wireless network provided from the first server means to the corresponding mobile terminal, and transmits the other content in the current wireless network. When the handoff to the wireless network is completed, the modified multimedia content from the first server means receives the multimedia content service system using a heterogeneous wireless network, characterized in that for transmitting to the mobile terminal. A method of serving multimedia content to a mobile terminal in a wireless network system including a plurality of heterogeneous wireless networks, A first process of generating and storing a plurality of modified multimedia contents each corresponding to the plurality of heterogeneous wireless networks whenever the multimedia contents to be provided are provided; When there is a service request from a mobile terminal, a second process of extracting modified multimedia contents corresponding to a currently connected wireless network from among a plurality of stored modified multimedia contents and serving them through the wireless network; A third process of detecting when the corresponding wireless network is changed to another heterogeneous wireless network, When a change to the other wireless network is sensed, a fourth to extract other modified multimedia contents corresponding to the other wireless network among the stored plurality of modified multimedia contents and transmit the same to the mobile terminal through the other wireless network; Process, A fifth process of repeating the third process and the fourth process whenever the current wireless network is changed to any other wireless network Multimedia content service method using a heterogeneous wireless network comprising a. The method of claim 7, wherein When the change to the other wireless network is detected, the method buffers and transmits the multimedia content corresponding to the current wireless network to the corresponding mobile terminal, and the handoff from the current wireless network to the other wireless network is completed. When performed, the multimedia content service method using a heterogeneous wireless network, further comprising the step of performing the fourth process. A system for servicing multimedia content to a mobile terminal in a wireless network system including a plurality of heterogeneous wireless networks, Means for storing respective multimedia contents to be served; Means for detecting when the multimedia content is a service, whether the current wireless network in service is changed to another heterogeneous wireless network; In response to a service request from any mobile terminal, retrieves the multimedia content or the modified multimedia content corresponding to the wireless network stored in the storage means, transmits the multimedia content to the mobile terminal, and detects a change in the wireless network. First server means for requesting provision of modified multimedia content corresponding to the other wireless network; In response to the service request, withdraw the service-selected multimedia contents from the storage means to the first server means, and transmit the service-selected multimedia contents to the other wireless network in response to a request for provision from the first server means. Second server means for transforming the multimedia content into a multimedia content corresponding to the same, and providing the modified multimedia content to the first server means. Multimedia content service system using a heterogeneous wireless network including a. The method of claim 9, The plurality of heterogeneous wireless networks, at least two of the CDMA wireless network, WiBro wireless network and WCDMA wireless network, characterized in that the multimedia content service system using a heterogeneous wireless network. The method of claim 9, The multimedia content is a multimedia content service system using a heterogeneous wireless network, characterized in that the VOD / MOD content. The method of claim 9, The wireless network change is detected by a mobile terminal receiving the multimedia content, and the multimedia content service system using a heterogeneous wireless network, characterized in that notified to the first server means. The method according to any one of claims 9 to 12, When the change of the wireless network is detected, the first server means buffers and transmits multimedia content corresponding to the current wireless network provided from the second server means to the corresponding mobile terminal, and transmits the other content from the current wireless network. When the handoff to the wireless network is completed, the modified multimedia content from the second server means receives the multimedia content service system using a heterogeneous wireless network, characterized in that for transmitting to the mobile terminal. A method of serving multimedia content to a mobile terminal in a wireless network system including a plurality of heterogeneous wireless networks, A first process of storing in a database whenever multimedia content to be serviced occurs; When there is a service request from a mobile terminal, a second process of extracting selected multimedia contents from among a plurality of pre-stored modified multimedia contents and serving them through a corresponding wireless network; A third process of detecting when the current wireless network is changed to another heterogeneous wireless network, A fourth process of transforming the selected multimedia content into multimedia content corresponding to the other wireless network when the wireless network change is detected; A fifth process of transmitting the modified multimedia contents to the arbitrary mobile terminal through the other wireless network; A sixth process of repeating the third to fifth processes whenever the mobile terminal is changed from the current wireless network to any other wireless network Multimedia content service method using a heterogeneous wireless network comprising a. The method of claim 14, When the change to the other wireless network is detected, the method buffers and transmits the multimedia content corresponding to the current wireless network to the corresponding mobile terminal, and the handoff from the current wireless network to the other wireless network is completed. If so, the method further comprising the step of performing the process after the fourth process, the multimedia content service method using a heterogeneous wireless network.

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