KR20120109447A - Method and apparatus for transceiving data through heterogeneous networks - Google Patents

Abstract

PURPOSE: A data transmission and reception method using a heterogeneous network and apparatus therefor are provided to reduce the load of a data service for a mobile communication network by automatically distributing loads to other networks. CONSTITUTION: A terminal receives content data. The terminal connects to a first network. The terminal connects to a second network. A skip section for the undelivered content data is determined. The terminal simultaneously uses the first and the second network for transmitting the content data. The first network is used for the skip section. The transmission of the terminal is transmission for the content data including the expression of a section after the determined section. [Reference numerals] (AA) Existing transmission part; (BB) Simultaneous transmission time section; (CC) Single transmission time section

Description

Method for transmitting / receiving data using heterogeneous networks and apparatus therefor {Method and Apparatus for transceiving data through Heterogeneous networks}

The present invention relates to a method for transmitting and receiving data using heterogeneous networks, in particular heterogeneous networks having different numbers of users, service areas, or qualities of communication services, and a terminal and an apparatus therefor.

With the development of mobile communication network, users can receive various information and contents that they need regardless of the place using mobile phones, smart phones, tablet computers, etc.

Users access and use high-speed wireless networks, such as Wi-Fi wireless networks, that can support them in real time in case of large amounts of information or content, and otherwise use mobile telephone networks such as CDMA2000 or There is a tendency to use a W-CDMA mobile communication network. This may be due to a communication environment in which a high-speed wireless network is serviced only in a limited area and provides a communication infrastructure to a user at no cost.

However, since the high-speed wireless network is only available in limited areas scattered locally, as mentioned above, it is a dissatisfaction for users who have high mobility or low accessibility to serviceable areas. It is true that such complaints have a negative effect on the number of subscribers. In order to eliminate these negative factors, service providers are lowering or eliminating the cost barrier of data service through mobile telephone network that can service the whole area except radio shade area.

However, as the utilization rate of the data service through the public mobile telephone network of the above-mentioned mobile terminals for information or content requiring higher transmission quality increases, it causes a heavy load on the mobile telephone network. Increasing the load also creates another problem by drastically reducing the channel or band for general purpose communications such as voice calls.

The present invention can reduce the load of the data service on the mobile communication network by automatically distributing the load to the data service through the mobile communication network, in particular, a large amount of data service, to other high speed networks. Iii) It is an object of the present invention to provide a data transmission / reception method using a network and an apparatus therefor.

Another object of the present invention is to transmit and receive data using a heterogeneous network, so that the power of a terminal consumed to check whether it is accessible to other high-speed networks other than the currently connected mobile telephone communication network can be minimized. It is to provide a method and an apparatus therefor.

The object of the present invention is not limited to the object explicitly stated above, and of course includes the purpose of achieving an effect that can be derived from the specific and exemplary description of the present invention.

According to an aspect of the present invention, a method for providing data by using a heterogeneous network including a first network and a second network may include transmitting content data to a terminal connected through the first network. And determining, when the terminal is connected through the second network, a point at which a portion of the currently untransmitted data of the content data is skipped; And transmitting the content data of the section after the determined point to the terminal through at least the second network.

In one embodiment according to the present invention, the determining step includes a time required for seamless continuous reproduction of previously transmitted data of content data transmitted through the second network and data transmission through the second network. Determining a duration of data transmission through the first network based on a temporal element including a time of data processing necessary for the data processing; and determining a duration of the content data for which the determined duration is required during play. And determining the interval.

In one embodiment according to the present invention, the transmission to the terminal includes a block in which the content data is divided, and is made in a segment unit in which a number for the order of transmission is included in a header.

In an embodiment according to the present invention, the parallel step may include a base segment and an enhancement segment for the content packet constituting the content data, wherein the base segment is the first network and the second network. The reinforcement segment is transmitted through the other network, and the base segment includes an infrastructure picture of a video packet of the content packet and an audio packet of the content packet. A reinforcement segment includes pictures of all or some types of picture types predicted from other pictures in the video packet, and each segment includes a sequence number assigned according to the data order of the content data and the segment from the segment. Packing information necessary for the restoration of video packet and / or audio packet Included header is added. The packing information may include information on whether the corresponding segment is generated by block division of the content data or by repacking by extracting content attributes of each content packet, and includes information on the type of the corresponding segment. And, optionally, coding information for decoding only by infrastructure pictures. In this embodiment, the one network may be the second network, the other network may be the first network, and the method may include disconnecting or transmitting the connection with the terminal through the second network. If unsuccessful, selectively transmit a reinforcement segment including a picture associated with the base segment successfully transmitted through the second network through the first network, and immediately after the transmission or upon no transmission, the successively transmitted base segment. And constructing a segment by block division of the portion of the content data after the pictures of and transmitting through the first network. In this embodiment, the one network may be the first network, the other network may be the second network, and the method may include disconnecting or transmitting a connection with the terminal through the second network. If unsuccessful, selectively transmit, through the first network, a reinforcement segment that includes a picture associated with the base segment transmitted through the first network until then, immediately after the transmission or upon no transmission. And constructing a segment by block division of the portion of the content data after the pictures of the segment and transmitting it through the first network. Also, in the present embodiment, the parallel operation may determine the one network based on the relative size of the base segment and the reinforcement segment and / or the superiority of data transfer reliability between the first network and the second network. Content packets with caption information are included in the base segment.

In one embodiment according to the present invention, requesting a report on the access resources of the second network accessible to the terminal connected through the first network through a radio signal channel of the first network, and the terminal Determining one access resource based on associated service characteristic information and the access resource information received from the request, and designating the determined access resource to establish a wireless signal channel of the first network. And further comprising the step of instructing through the connection, wherein the connection through the second network of the terminal is performed by the command. In the present embodiment, the request for reporting on the access resource includes a duration for confirming whether the terminal has access to the access resource of the second network and a period for confirming. The confirmation duration and the confirmation period included are variable in length depending on the communication environment of the current service area of the terminal. In this embodiment, the service characteristic information associated with the terminal includes a load on traffic or resources in each accessible service area of the terminal on the second network and each accessible service area of the terminal on the second network. Pre-registration information, including a class, for each user using the service, a type of each access resource forming each accessible service area of the terminal on the second network, and a current location or current time zone of the terminal. At least one information element in the group of information.

In one embodiment according to the present invention, the content data having the representation content of the section after the determined point is the content data of the section consecutive to the skipped partial section, or a content source including data of the partial section. This is content data on a content source that has a different presentation quality from and exists separately from the content source.

In an embodiment according to the present invention, the parallel operation may include distributing the content data having the content of the section after the determined point through one or more third networks other than the first and second networks. Send to the terminal.

In one embodiment according to the present invention, the second network includes a plurality of wireless networks which are separated from each other but accessible through the same connection method from the viewpoint of the terminal. In addition, the second network has zones dispersed in the serviceable area of the first network as the serviceable area, and the speed of the service is on average faster than that of the first network.

According to another aspect of the present invention, a mobile terminal for receiving content data provided from a remote server is configured to simultaneously transmit and receive data by connecting to each network of a heterogeneous network including a first network and a second network. A module periodically checks and accesses a connection resource of the second network that is accessible when a condition that content data is received from the remote server through a connection with the first network established by the communication module is satisfied. When a connection resource is identified, an operating processor for configuring information of the connection resource so that the communication module can be reported through the wireless channel of the first network, and the remote server established by the communication module. A segment consisting of portions of the content data, received and distributed over each connection with a first network and a second network From is configured to include a pre-configured to provide an application that can play the content data to restore the content data.

In one embodiment according to the present invention, the operating processor is configured to confirm whether the access resource of the second network is accessible based on a request for access resource confirmation of the second network received through a wireless channel of the first network. The acknowledgment is confirmed at the interval specified in the request, and the acknowledgment operation is configured to terminate when there is the report or when the duration of the acknowledgment operation specified in the acknowledgment request elapses.

In one embodiment according to the present invention, the preprocessing unit is configured to perform the restoration of the content data by extracting the divided blocks of the content data included in the segment and sorting each other according to the sequence number of the segment.

In one embodiment according to the present invention, the received segments are composed of a base segment and a reinforcement segment, and each base segment comprises an infrastructure picture of the video packet constituting the content data and the content data. The audio packet includes the P and B pictures of the video packet in each reinforcement segment, and the preprocessing unit is based on the packing information described in the header of each segment if the reinforcement segment associated with the base segment is received. Reconstruct the content data by restoring the video packet or the audio packets. In another embodiment, the preprocessing unit configures the encoding information described in packing information of each segment to be header information of a video packet provided to the application when the reinforcement segment associated with the base segment is not received. Reconstruction of the content data into a video packet and an audio packet composed only of I pictures is performed.

According to yet another aspect of the present invention, an apparatus for providing data using a heterogeneous network including a first network and a second network may transmit content data to a terminal connected through the first network. And when the terminal is connected through the second network during the transmission, determines a point at which a portion of the data that is not currently transmitted of the content data is skipped, and wherein the first portion of the skipped content data of the partial region is determined. A first server configured to perform transmission to the terminal through a network and to the terminal through at least the second network for content data having a representation of a section after the determined point; and the first network The second network accessible to a terminal specified from the first server, the identification information of the terminal connected via the identification information; Request via the radio signal channel of the first network to report information on a connection resource, and allow the terminal to access the second network based on the service characteristic information associated with the terminal and the connection resource information received from the request. And a second server configured to optionally command.

In one embodiment according to the present invention, in the request for information reporting on the access resource, a duration for confirming whether the terminal can access the access resource of the second network and a confirmation period are specified.

In one embodiment according to the present invention, the first server receives the content data from a third server that stores various contents and transmits the content data to the terminal.

In an embodiment according to the present invention, the second server receives the service characteristic information associated with the terminal from a fourth server or the first server that manages operation information of the first network and the second network, and receives the received. Determine one access resource included in the access resource information based on the service characteristic information, and designate the determined access resource to instruct to access the second network. In this embodiment, the service characteristic information associated with the terminal includes a load on traffic or resources in each accessible service area of the terminal on the second network and each accessible service area of the terminal on the second network. Pre-registration information, including a rating, for each user using a network, a type of access resource forming each accessible service area of the terminal on the second network, and a current location or current time zone of the terminal. Include at least one information element in the group of information.

In another embodiment according to the present invention, the second server selects an access resource included in the access resource information so that the terminal does not access the second network based on the service characteristic information associated with the terminal. It is further configured not to. In this embodiment, the service characteristic information associated with the terminal includes a load on traffic or resources in the service area of the terminal on the first network, and the size of data not transmitted to the terminal in the content data. Include at least one information element in the group of information.

At least one embodiment of the present invention described above, or described in detail in conjunction with the accompanying drawings below, is a communication network, for example, carrying a large data load on a mobile telephone communication network providing a general purpose public communication service. Since it is possible to switch to a high-speed wireless LAN network or the like, it is possible to use the resources of the mobile communication network as efficiently as possible, and also to prevent some deterioration in the provision of universal communication services such as voice calls.

In addition, even when the load of large-capacity content data is transferred to a high-speed wireless LAN network, the access resources such as the wireless LAN network can be evenly distributed based on the current load on the connection resources. It ensures the safety of high-speed wireless network without generating any obstacles.

In addition, the present invention increases the user's convenience, such as increasing the download speed of content on average and stably providing audio and main video information to the terminal even when network conditions are unstable.

FIG. 1A illustrates an example of a network configuration in which a data transmission / reception method using a heterogeneous network is performed according to an embodiment of the present invention.
FIG. 1B illustrates an example of a network configuration illustrating that there are a plurality of WLAN networks that are separated from each other but accessible through the same access method in an embodiment according to the present invention.
2 is a schematic signal flow diagram of an embodiment of a data transmission / reception method using a heterogeneous network in accordance with the present invention, performed in the network configuration illustrated in FIG. 1A, and FIG.
3 is a diagram illustrating a format in which a report request for access resource information of a wireless LAN network and a corresponding report are transmitted / received through a paging / access channel according to a wireless signal protocol of a mobile communication network according to an embodiment of the present invention. As an illustration,
FIG. 4 is a diagram illustrating data of a corresponding content when a WLAN network session is established while the distribution control server of FIG. 1A transmits content data through a session established in a mobile communication network, according to an embodiment of the present invention. Conceptually illustrates how to distribute and transmit
5 is a diagram of segmenting data blocks into segments by sequentially segmenting content data according to a specified scheme by a segmenting processor executed in the distribution control server of FIG. 1A according to an embodiment of the present invention. It is an example of how to configure,
FIG. 6 illustrates a method in which block-sliced segments configured as in FIG. 5 are distributed and transmitted to each session according to an embodiment of the present invention.
FIG. 7 illustrates a method of extracting divided blocks in received segments and rearranging them in order of content play according to an embodiment of the present invention, and a related configuration in a terminal.
FIG. 8 illustrates a method of classifying encoded content packets transmitted to a terminal by attributes and repacking them in a predetermined manner to configure segments according to an embodiment of the present invention.
FIG. 9 illustrates a method in which a repacking processor executed in the distribution control server of FIG. 1A configures types of segments by repacking requested content data according to the embodiment of FIG. 8.
FIG. 10 illustrates a manner in which segment by type is distributed to each session and transmitted according to the embodiment of FIG. 9.
FIG. 11 is a diagram illustrating a method of extracting a repacked data pack in received segments, restoring them into content packets, and rearranging them in order of play according to an embodiment of the present invention; Illustrates the relevant configuration within,
12 illustrates a flowchart of a process of recovering content packets from a repacked segment, according to an embodiment of the present invention.
13A and 13B illustrate that a segment is divided into a block partitioning method and a repacking method by replacing a content source having a quality different from that of a previously transmitted content source while a separate session is connected according to an embodiment of the present invention. Each process is illustrated.

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

FIG. 1A illustrates an example of a network configuration in which a data transmission / reception method using a heterogeneous network according to an embodiment of the present invention is performed, and two heterogeneous networks constructed as different communication infrastructures, for example, FIG. For example, it includes a mobile phone communication network 10 and a wireless LAN network (2, 2 _I ), connected to each of the networks to control the point-to-point connection path with the mobile communication terminal (3 _J ) in the network And a distribution control server 100 for appropriately processing and distributing or concentrating the transmission / reception data, and a content server 110 for storing various information and video contents and selectively providing stored information upon request from the outside. And an access control server 120 for controlling access to the wireless LAN network 2 and 2 _I for traffic distribution, and monitoring the traffic of the mobile telephone communication network 10 and the wireless LAN network 2, resource) Integrated, efficient, and operate and also includes a central management server 13 to perform operations to manage by concentrating the information about the terminal to access the network. Hereinafter, for convenience of description, a 2G or 3G cellular network (hereinafter, abbreviated as “cellular network”) is taken as an example of the mobile telephone communication network 10, and a Wi-Fi wireless LAN network. (Hereinafter, abbreviated as "Wi-Fi network") will be described as an example of the wireless LAN (2, 2 _I ).

The WLAN network in which traffic is monitored by the central operation server 13 and the access terminal is identified is a public WLAN network installed and concentrated by a communication provider. On the other hand, there is a private wireless LAN network installed and operated by an individual, in particular, a wireless LAN network in a home. In the following description, when referring to the WLAN network 2,2 _I , it is assumed that it includes a public WLAN network and a private WLAN network. However, in various embodiments described below, in the case of the embodiment of checking the traffic of a specific service area of the wireless LAN network (2, 2 _I ) or information about the terminal in the service area, the terminal is a public wireless It is assumed that it exists in the LAN network, and other embodiments may be naturally applied even when the corresponding terminal exists in the private WLAN network.

In addition, in the following description, for the sake of convenience, the “wireless LAN network” is referred to as one object, but in reality, as shown in FIG. 1B, another heterogeneous network 20 is intervened so as to interact with the distribution control server 100. While the communication path can be formed, from the viewpoint of the terminal, the public WLAN network which can be accessed by the same connection method as the public WLAN network 2 for the purpose of wide area service, for example, the Wi-Fi connection method. The term "wireless LAN network", for example "Wi-Fi network", is used as a concept that includes an island network (5) separate from (2). In addition, when transmitting data to the terminal through the wireless LAN network, only the wireless LAN network exists in the transmission path of the data, and other heterogeneous networks 20 may naturally be included in the transmission path as illustrated in FIG. 1B. Therefore, in the following description or claims, the expression “transmitting data through a wireless LAN network (or a term meaning thereof)” does not exclude the existence of other heterogeneous networks in the transmission path.

2 is a schematic signal flow diagram of an embodiment of a data transmission / reception method using a heterogeneous network in accordance with the present invention, performed in the network configuration illustrated in FIG. 1A. The illustrated signal flow diagram is a mobile communication terminal 3 ₁ (for example, one of a smart phone, a tablet computer, a notebook, etc. that can access all the heterogeneous networks exemplified above, hereinafter abbreviated as “terminal”). When access to the Wi-Fi network is enabled, such as entering an arbitrary zone (2 ₁ ) that can access the Wi-Fi network within the cellular network (10) according to an embodiment of the present invention This is for the process of transmitting and receiving (P100 of FIG. 1A).

First, the terminal 3 ₁ designates an arbitrary content to the distribution control server 100 in the cellular network 10 and requests streaming thereof (S210). This request is hereinafter referred to as "cellular session" in order to distinguish it from a session 20 (hereafter a session formed over a Wi-Fi network) which is a logical connection between the distribution control server 100 and the terminal 3 ₁ . Is formed and transmitted to the distribution control server 100, and according to the request, the distribution control server 100 requests data transmission of the content to the content server 110 storing the specified content. In operation S211, the content data received according to the request is streamed (S212). According to an embodiment of the present invention, the meta data of the content (location, protocol, size, etc. of the content can be obtained without requesting the content server 110 to transmit the data of the content). After the various information for accessing the data is obtained as a mark-up language), the distribution control server 100 directly receives the corresponding content data based on the acquired metadata and streams the content data. You may. On the other hand, information on a list, etc. necessary for the terminal to select content is secured in the distribution control server 100 in advance by exchanging information with the content server 110.

In another embodiment according to the present invention, the terminal 3 ₁ directly connects with the content server 110 through the cellular network 10, and the content requested by the connection is a specific content (eg, , The content server 110 does not provide the requested content directly, but requests the distribution control server 100 to open a cellular session with the corresponding terminal 3 ₁ . It may be. At this time, the metadata for the requested content is also provided to the distribution control server 100. When the cellular session 20 with the terminal 3 ₁ is established at the distribution control server 100 or before the cellular session 20 is established, the cellular session between the content server 110 and the terminal 3 ₁ is released.

Meanwhile, the access information for the terminal 3 ₁ , that is, the terminal identification number, is provided to the distribution control server 100 or the content server 110 from the exchange station of the cellular network 10 at the time of establishing the cellular session. do.

The terminal 3 ₁ provides the streaming data to the user by outputting an image on an appropriate form, for example, on a screen using an appropriate decoder and / or application. During this process, the terminal 3 ₁ receives a "report request for information on a Wi-Fi network access resource" (S220). The Wi-Fi network access resource information report request is sent from the access control server 120, the access control server 120 is provided from the content server 110 or the distribution control server 100, The terminal is specified and sent using identification information of the terminal 3 ₁ that is streaming the content, and this dispatch is a predetermined sending cycle (this sending cycle is longer than the "connection resource confirmation duration" described below). It will be sent periodically according to). If, according to the information report request, the Wi-Fi network resource information report message is received from the terminal (3 ₁ ), the subsequent periodic sending is stopped.

In another embodiment according to the present invention, the position of the terminal is determined from the strength of radio waves reaching each base station or repeater of the cellular network 10 based on the position information of the terminal 3 ₁ on which content is being streamed. Is received from a separate location server (not shown), and the point grasped from the received location information is within or close to the Wi-Fi zone _{2N previously} grasped by the access control server 120. When the information report request for the Wi-Fi network access resources may be sent to the terminal (3 ₁ ).

The Wi-Fi network access resource information report request and report according thereto, as illustrated in FIG. 3, may be a radio signal channel, for example, paging, according to a radio signal protocol with a terminal of the cellular network 10. Transmitted / received through a paging / access channel, and these are identifiers 301 assigned to message types, such as paging and commands, which are previously defined and used for voice calls or data transmission and reception through the cellular network 10. The type is designated by another identifier 311. At the end of the type identifier 311, the unique number 312 of the terminal that is the target of the Wi-Fi network access resource information report request is displayed. Accordingly, the terminal 3 ₁ confirms a control command (Wi-Fi network access resource information report request) for accessing the Wi-Fi network, which is being received through the paging channel, although the call is currently being received as the content is being streamed. Accordingly, by searching for the Wi-Fi signal in the signal band of the Wi-Fi network, information about an AP (Access Point) having a predetermined signal quality or more is obtained.

In another embodiment according to the present invention, the Wi-Fi network access resource information report request message 320 may be configured by including a Wi-Fi network access resource check duration and a check period in addition to the unique number of the terminal. If a terminal identification code of another method mutually promised between the switching center and the terminal in the cellular network 10 is used, the terminal identification number may not be included in the access resource information report request message. At this time, when the access control server 120 specifies the terminal and requests the cellular network 10 to transmit a Wi-Fi network resource information report request, the access control server 120 based on the subscriber registration management information in the cellular network 10. The subject of the report request message is now specified by using the unique identification code assigned to the terminal when the terminal is transmitted from the base station via the registered exchange.

The Wi-Fi network access resource confirmation duration and confirmation period are values that allow the terminal to acquire and report AP information of nearby Wi-Fi networks according to the period within the duration. Providing the terminal with the confirmation duration and period in this way prevents waste of power used by the terminal 3 ₁ always checking the connection resources of the Wi-Fi network, and also prevents unnecessary situations, for example, This is to prevent power consumption from identifying access resources even in a non-service area where Wi-Fi zone does not exist or entering the non-service area.

In one embodiment according to the present invention, the confirmation period may be varied without using a fixed value continuously. For example, the access control server 120 may be in a service area of the terminal 3 ₁ (eg, coverage of a base station providing communication service to the terminal) identified from the positioning server. When the traffic of the cellular network 10 (which is confirmed from the central management server 130) is large, increases or increases, set a confirmation period shorter than the confirmation period used in the previous report request message. The Wi-Fi network access resource information report request message 320 is used for transmission. This is because it is advantageous to convert the resource occupancy traffic of the cellular network 10 to the Wi-Fi network 2 even slightly faster. As another example, the access control server 120, if the Wi-Fi network resource information report message described below is not received with respect to the previously reported information report request message, and when the next sending time according to the sending cycle, The confirmation period is set longer than the previously specified confirmation period and used in the report request message. This means that if you do not check the accessible Wi-Fi resources for the specified verification duration, it is unlikely that you will enter the Wi-Fi service area within a short time, so the verification period is longer to reduce the power consumption of the terminal. For sake.

In one embodiment according to the invention, the confirmation duration may also vary without a fixed value being used continuously. For example, if the variability of the traffic of the cellular network 10 in the service area of the terminal 3 ₁ is large, the confirmation duration is set short (confirmed according to the situation at the time of transmission of the confirmation duration thereafter. It is possible to change the period so that it is advantageous to cope with volatility.) In case of weak volatility, a relatively long confirmation duration is used. As another example, the confirmation duration may be variably set and used in proportion to the time interval of the confirmation period that is variably set.

Meanwhile, the terminal 3 _{1 transmits} a Wi-Fi network resource information report message including information on the acquired AP, for example, an IP address of each AP, through an access channel to the adjacent base station of the cellular network 10. To send. If the report is made even within the confirmation duration, the access resource check process is not performed even in a subsequent period. The Wi-Fi network resource information report message may have a format 330 as illustrated in FIG. 3. The Wi-Fi network resource information report message is distinguished from an identifier assigned to each type of existing messages (eg, registration message, call response message, etc.) inserted into an access channel of the cellular network 10. A field 331 in which an identifier is recorded, a unique number field 332 of a terminal, and a field 333 including an identified AP or IP of APs. For example, the Wi-Fi network resource information report message may not include the terminal unique number field 331 for the same reason as described in the Wi-Fi network access resource information report request message carried on the paging channel.

When the information about the neighbor AP is obtained, the terminal 3 _{1 constructs} a Wi-Fi network resource information report message as described above and transmits the message to the neighbor base station of the cellular network 10 through an access channel. The access channel data including this message is properly interpreted at the receiving switching center, and properly routed to the access control server 120 by the operation network for network control and management (S221). If the terminal unique number field is not included in the Wi-Fi network resource information report message, the exchange receiving the message adds a unique number for the terminal that has sent the message to the access control server 120. To be routed. If the information about the neighboring AP is not obtained, the terminal 3 ₁ may not configure a Wi-Fi network resource information report message.

In an embodiment of the present invention, the reception of the information report request for the Wi-Fi network access resource and the generation / transmission of the report information accordingly are firmware or hard-coding to the terminal ₃₁ . It is performed by an operating processor embedded in the form of a program.

In the above description and drawings, the Wi-Fi network access resource information report request and information reporting thereof are made through the paging / access channel of the cellular network 10. However, this is merely one example. If a more stable radio channel is used for management and / or control as a radio resource operated by (10), the Wi-Fi network access resource information request request and the corresponding information report may be made through the channel.

Upon receiving the Wi-Fi network resource information report message, the access control server 120 designates one of the APs specified by the IP included in the report message (for example, Wi-Fi zone 2 in FIG. 1A). ₁ AP) transmits a message 340 that allows the terminal 3 ₁ to access the Wi-Fi network 2 through the AP (S222). Of course, this message has a unique type identifier 341 as described above and is received at the terminal 3 ₁ via a paging channel.

The access control server 120 selects one of a plurality of APs included in the Wi-Fi network resource information report message according to the terminal associated service characteristic information received from the central operation server 130. The service characteristic information associated with the terminal may include load for each AP forming the Wi-Fi zone or traffic information in the zone. For example, the access control server 120 loads each AP included in the Wi-Fi network resource information report message received from the central management server 130 and / or the local network to which the AP is connected. One of the plurality of APs may be selected based on traffic and the like. In another embodiment according to the present invention, registration information of another terminal (3 ₂ , 3 ₃ , 3 ₄ ,...) That is previously serviced in the zone of each AP accessible by the terminal is also included in the service characteristic information associated with the terminal. May be included. That is, one AP may be selected according to registration information of other terminals that are previously serviced in each AP zone. The registration information is information that is pre-registered at the time of service establishment for the user of the terminal, and defines information such as the grade of the user, the quality of the required service, and is managed as a DB in the central operation server 130. The Wi-Fi network 2 is accessed within an arbitrary Wi-Fi zone by the permission message 340 of the access control server 120 or regardless of the reception of the permission message of the access control server 12. When the registration information for the terminal is provided from the central operation server 130 to the access control server 120. Therefore, when determining the AP to allow the access of the terminal 3 ₁ , the access control server 120 refers to registration information about other terminals in each Wi-Fi zone. If the user class or the quality of the requested service of the terminals serving in the zone (2 ₂ ) by the specific AP included in the access resource information report is high, the traffic of the service area by the AP is relatively low even if the AP is relatively low. It is also possible to determine the AP of another zone 2 ₁ without specifying.

In another embodiment according to the present invention, the current remaining amount of content is also included in the service characteristic information associated with the terminal. In other words, when the Wi-Fi network resource information report message is received, the access control server 120 may determine one AP according to the remaining amount of content transmission to the terminal 3 ₁ . For example, if the remaining amount of content transmitted to the terminal 3 ₁ that has transmitted the Wi-Fi network resource information report message is received by inquiring of the distribution control server 100, and the received amount is large, Among the received APs, an AP having a relatively large margin in the transmission bandwidth may be selected, and if the remaining amount is small, an AP having a normal margin may be selected to transmit the allow message 340. If the received transmission remaining amount is less than or equal to a preset size, the access control server 120 may not allow access to the Wi-Fi network 2. In other words, the allow message 340 is not transmitted at this time, in order to avoid the functional / procedural overhead for heterogeneous network co-transmission when a small amount of data remains.

In another embodiment according to the present invention, the load on the traffic or resources of the service area of the cellular network 10 in which the terminal is located is also included in the service specific information associated with the terminal. For example, when receiving the Wi-Fi network resource information report message, the access control server 120 from the central management server 130 to the traffic or resources of the service area of the cellular network 10 When the load information is received and the received information indicates that the free bandwidth of the corresponding service area is sufficient, the load of the content transmission is not loaded into the cellular network without allowing access to the Wi-Fi network 2. 10) may be made fully burdened.

In another embodiment according to the present invention, the type of each AP is also included in the service characteristic information associated with the terminal. That is, one AP may be selected according to the type of each AP. For example, in the APs included in the Wi-Fi network resource information report, all but one belong to the public WLAN network where the resource and the user terminal are monitored in the central management server 130, and the one If it belongs to the unmonitored private wireless LAN network (private wireless LAN network, whether the IP is not registered in the central management server 130 or is not managed.) If it belongs to the access control server ( 120 may designate an AP of the private WLAN network and transmit the allow message 340. This is because the terminal is usually located in the user's home or dedicated office space, so that the designated AP has a high probability of providing an optimized transmission service to the terminal.

In another embodiment according to the present invention, the spatial location or time zone of the current terminal is also included in the service characteristic information. For example, if the current location of the terminal identified from the positioning server is near a pre-registered address for the user of the terminal or a time zone having a high probability that the time zone is at home, such as at night, the access control server 120 ) May transmit the permission message 340 by designating an AP having an IP not managed by the APs included in the Wi-Fi network resource information report.

When the terminal 3 ₁ is close to an area where Wi-Fi network access is possible while receiving or receiving content through the distribution control server 100, the above-described process is performed. ₁ ) makes a Wi-Fi network access request using the IP 342 of the AP specified in the Wi-Fi network access permission message 340 and receives configuration information such as IP and DNS to be used by the request. The access state of the Wi-Fi network 2 is established. In this state, the terminal 3 ₁ requests to establish a session with the distribution control server 100 (hereinafter referred to as a “Wi-Fi session”) and responds to the distribution control server 100 in response to a Wi-Fi session ( 21) is established (S230).

The terminal 3 ₁ may independently perform the Wi-Fi network access resource check without originating from the command of the distribution control server 100. To this end, the terminal 3 ₁ may be installed in a specific monitor application (this application may be provided from the distribution control server 100 so that it is always performed at the time of startup of the terminal, or may be installed in the operating processor in the form of a firmware or hardcoded program). May be some of the functions inherent in.) And the monitor application monitors whether a large amount of content, such as a video, is received through the cellular network 10 or whether an application involving such an execution is executed. If there is such a reception or such an application is executed, periodically checks the Wi-Fi network access resources around therefrom. When the accessible Wi-Fi network access resource is identified, of course, as described above, the Wi-Fi network resource information report message is configured and transmitted on the access channel to be routed to the access control server 120.

Meanwhile, the distribution control server 100 recognizing the establishment of the Wi-Fi session, the Wi-Fi session 21 is set for the data of the content currently being transmitted to the terminal 3 ₁ through the cellular session 20 Partial distribution is transmitted through (S231). The method of distributing and transmitting data is as follows.

FIG. 4 conceptually illustrates a method of distributing and transmitting data of a content when a Wi-Fi session is established while the distribution control server 100 transmits content data through the cellular session 20. . As shown, when the Wi-Fi session is established, from the time point t ₀ , the content data from the point CP ₂ spaced apart by the data gap DGap from the content point CP ₁ currently being transmitted. Transmission through the established Wi-Fi session 21 and data transmission through the aforementioned cellular thin line 20 for content data of the data gap DGap are performed in parallel. Accordingly, the data gap section 401 connected to the data section 400 transmitted before the time point t ₀ when the Wi-Fi session 21 is established continues through the cellular session 20. The interval 402 is then transmitted via the Wi-Fi session 21 simultaneously with the transmission of the data gap interval 401. After the successive data gap interval 401 has completed transmission through the cellular session 20, according to an embodiment according to the present invention, either alone or through both sessions 20, Content data is transmitted in combination with 21).

In determining the data gap DGap, the distribution control server 100 switches a mode or a processing method so that the terminal 3 ₁ can seamlessly play content for data received in parallel through a plurality of sessions. The time required for transmission, the time required for the data of the section transmitted through the Wi-Fi session 21 to be the minimum buffering for the play, and / or the subsequent transmission for increasing the tolerance of the reproduction. Consider the repacking processing time for the data (described later). Considering these temporal factors, if the duration of the cellular session-based data transmission is appropriately determined, the size of the data interval corresponding to the duration, that is, the data gap Dgap, is determined. To determine this size, the distribution control server 100 decodes header information of a content packet (eg, a PES packet) of content data to be transmitted and decodes a time stamp of each content packet from the decoded information. Or the PTS (Presentation Time Stamp) to determine the duration of the playing time to determine the size of the data gap DGap corresponding to the determined duration.

The transmission of content data through the established Wi-Fi session 21 is stopped (411) unless the established Wi-Fi session 21 is released or the other party acknowledges the data through the session (411). After the last acknowledged data point Dp_re, content data is transmitted only through the cellular session 20 again (S240). On the other hand, if the established Wi-Fi session 21 is not released or the other side acknowledgment (acknowledged) of the data through the session (411), the distribution control server 100 for the corresponding terminal (3 ₁ ) The access control server 120 is notified of the identification number and the "non-use of the Wi-Fi session," accordingly, the access control server 120 activates the aforementioned sending cycle, the terminal 3 ₁ Wi-Fi access resource information request message is periodically sent again.

According to the present invention, as described above, since one piece of content is transmitted by using a heterogeneous network together, the terminal 3 _{1 on} the receiving side may change the mode or change the processing method if necessary. There is a need for transmission to arrange in order for content play.

In one embodiment according to the present invention, as illustrated in FIG. 5, the segmenting processor 501 executed in the distribution control server 100 may be configured in a manner designated sequentially from the first transmission on the requested content data. By dividing along, data blocks are constructed, and a segment including an order 511 and a size 512 of the block is added to each data block 502 to construct and transmit a segment. The designated scheme may be a designation of the number of content packets (eg, PES packets) constituting content data included in one segment. Alternatively, a scheme of splitting the block into blocks based on audio packets in the content packet may be specified.

As illustrated in FIG. 5, for block-sliced segments including a split block, the distribution control server 100 may be configured according to a current connection state with the terminal 3 ₁ . The segments may be sent in a single session or distributed in both sessions. 6 shows an example of such distributed transmission. The segments illustrated in FIG. 6 are configured in the manner as illustrated in FIG. 5, and are shown only by the sequence numbers of the segments for simplicity of the drawings. As illustrated, when the Wi-Fi session 21 is established (611), the distribution processor 601 executed in the distribution control server 100 is located in the data gap (DGap) period determined as described above. The corresponding segments 602 (several segments having sequence numbers consecutive to the last sequence number “N-1” of the segment transmitted before the establishment of the Wi-Fi session 21 (in the example of FIG. 6) , Segments N) and "N + 1" are still transmitted through the cellular session 20, and thereafter the established Wi-Fi session 21 for segments of the sequence. Distribute to transmit via Then, the established Wi-Fi session 21 is released or the terminal 3 ₁ leaves the current Wi-Fi zone without a specific control operation for the session, thereby acknowledging the other party's data through the session. If not) (612), the next number after the last acknowledged segment sequence number (“N + k” in the example of FIG. 6) is distributed again to be transmitted through the cellular session 20.

As illustrated in FIG. 6, since content data is distributed and transmitted through the cellular network 10 and the Wi-Fi network 2 which are heterogeneous networks, the terminal 3 ₁ receiving the data is in the order of content play. Reorder the received segments to fit. FIG. 7 shows the manner in which this process is carried out and the relevant configuration in the terminal 3 ₁ . As shown, segments by a block division method that are received together through a cellular session 711 and a Wi-Fi session 712 established by the communication module 710 for performing data transmission and reception according to various protocols. A preprocessing processor 702 is included to align according to the sequence number of the segment and then remove the header of the segment and provide the sequential content blocks to the application 701 for content play. The preprocessing processor 702 may transmit the distribution control server 100 to the terminal 3 _{1 in} advance in an applet form before executing the requested content, or may be received through a separate download. It may be an application that is executed. The distribution control server 100 checks whether the preprocessor 702 is installed in the terminal 3 ₁ before transmitting the requested content and requests execution if it is installed. Otherwise, the distribution control server 100 provides the terminal in the form of an applet. It can also be executed at (3 ₁ ).

When a user passes through one or more Wi-Fi zones 2 ₁ , .. 2 _k ,... After selecting and receiving content through the cellular network 10, the user's terminal 3 ₁ The application 701 for the content play within) receives the content blocks arranged in the order of play despite the combination of heterogeneous networks, so that the same as the sequential reception through the single network, that is, the cellular network 10 The content can be played and displayed on the screen. In addition, while in the Wi-Fi zone 2 ₁ ,..., 2 _k ,..., Content data can be transferred over the relatively high speed Wi-Fi network 2, as illustrated in FIG. 4 or 6. A portion (402 of FIG. 4, “N + 2” to “N + k” segments of FIG. 6) (a large amount of data compared to a cellular network for the same time) is transmitted, so that the data load as much as that transmitted is transmitted to the cellular. It is alleviated from the network 10. Therefore, in the case of the cellular network 10, the resources to be occupied by heavy data such as video can be allocated to a normal service such as a voice call. It helps to prevent degradation.

In another embodiment according to the present invention, content data packed in a content packet, for example, a PES packet, is repacked according to an attribute and transmitted. In the above-described embodiment, the encoded content data is divided into blocks, and only the header is added to distribute the data to a single session or to each session. However, in the present embodiment, the encoded content data is classified by attributes to be reclassified in a predetermined manner. Packed and sent in segments. FIG. 8 illustrates an example of a repacking method of content data.

In the example shown in FIG. 8, two types of segments are formed for successive content packets 801 of content data based on an audio packet. The segment 802 of the video packets includes a base segment 810 and an enhancement segment 820. The base segment 810 includes an audio packet 812 in the target segment 802, and extracts only the infrastructure coded pictures 811 included in the video packets in the target segment 802. Included. The reinforcement segment 820 extracts P and / or B pictures, which are prediction type coded picture types, included in other video pictures or pictures included in the video packets in the target section 802. Included. Of course, although not shown in Figure 8, the header information of each content packet is included in the base segment as it is. If a packet for subtitles (eg, a subpicture packet) exists in the content packet, the packet is included in the base segment in the same manner as an audio packet.

In another embodiment according to the present invention, a predicted coded P picture type may be included in the base segment.

As described above, the repacking is performed by the repacking processor 901 executed in the distribution control server 100, and the repacking processor 901 is the embodiment described above. As in the above, each segment (base segment and reinforcement segment) is added with the segment sequence number 911 and the size of the segment 912 as a header, and the packing information 913 related to the repacking is also prepared and included in the segment header. . The method of assigning a sequence number to a segment follows the encoded order of the original content packet and assigns the sequence number immediately before the associated reinforcement segment to the base segment.

In the embodiment described with reference to FIGS. 8 and 9, a pair of base segments and reinforcement segments are respectively configured for a section based on one audio packet, but this is merely an example and the principles and concepts of the present invention are necessarily limited thereto. It doesn't happen. That is, a pair of base segments and reinforcement segments may be configured for a content section to which a plurality of audio packets belong.

The repacking processor 901 packs the information for reference in order to be able to recover original video packets and audio packet (s) from a pair of base and enhancement segments when content packets are repacked. It is included in the information 913. For example, the packing information 913 may include whether or not the segment is repacked (if not the repacked segment, the block information is simply block-sliced as described with reference to FIG. 5). Body), type of segment (base, reinforcement) when the segment is repacked, and pictures (I) 811, picture in the segment, as illustrated in FIG. The interval (P, B pictures) 820 or the audio packet 812 includes information on the packet number 831 to belong to the restoration of the sequence of the content packet and the position pt _k in the content packet. do.

In addition, the repacking processor 901, when performing the repacking as described above, decodes the header information of each content packet to grasp the decoding time information of each I picture to be included in one base segment, Encoding information that allows each I picture to be decoded at the identified time is prepared and included in the packing information 913 as well.

Before the Wi-Fi session 21 is established, the repacking processor 901 may include the segment by block division described above with reference to FIG. 5 (this segment includes, of course, the aforementioned packing information. The packing information only includes information indicating that the packet is not repacked.) When the configuration operation is performed and the Wi-Fi session 21 is established, the packet data information from the rear end of the consecutive data gap section DGap as described above is performed. If the Wi-Fi session 21 is released or there is no acknowledgment for the transmitted segment, the next content packet of the content packet (s) belonging to the last reply segment starts. Configuration of the segment by block-sliced described above is performed.

The repackaged segments configured by the repacking processor 901 while the Wi-Fi session 21 is established are distributed processor 1001 executed in the distribution control server 100 as illustrated in FIG. 10. Is distributed to the cellular session 20 and the Wi-Fi session 21. The distribution processor 1001 checks the segment type information described in the packing information 913 of the repacked segment, the cellular session 20 in the case of the reinforcement segment, and the Wi-Fi session 21 in the case of the base segment. In order to distribute sequentially according to the sequence number 911 of the corresponding segment. Segments 1010 repacked according to this process are distributed to the cellular session 20 and the Wi-Fi session 21 and transmitted at the same time, and segments generated by block division before and after the Wi-Fi session 21 (the Wi After the Fi session 21 is established, segments (including segments 1002) with data gap intervals contiguous to previously transmitted data are transmitted only to the cellular session 20.

According to an embodiment of the present invention, even after the high speed Wi-Fi session 21 is established, content data through the cellular session 20 is transmitted, i.e., resources of the cellular network 10 are used, but heterogeneous. As for a relatively large amount of data is transmitted through the established Wi-Fi session 21 when the content data section is transmitted using the network in parallel, the cellular network can be used by using the Wi-Fi network 2 in combination. The data load on 10 is greatly reduced.

As illustrated in FIG. 10, the terminal 3 ₁ realigns the received segments and repacks the received data pack, that is, the segment body, so that content data is transmitted using a heterogeneous network together. De-packing is performed on the data. 11 shows the manner in which this process is carried out and the relevant configuration in the terminal 3 ₁ . As shown, the order of segments for the segments received together through the cellular session 1111 and the Wi-Fi session 1112 established by the communication module 1110 to perform data transmission and reception according to various protocols. After sorting by number, a preprocessing processor 1102 is provided to the application 1101 as a sequence of content packets, eg, PES packets, required by the application 1101 for content play. The preprocessing processor 1102 is provided to the terminal 3 ₁ from the distribution control server 100 or other server in the same manner as in the above-described embodiment, and executed when necessary.

The preprocessing processor 1102, the block segmentation segments received through the cellular session 1111 (segments indicating that the packing information of the segment is not 'repacked') as in the above-described embodiment In the same manner, the segment header is removed and the blocks of the data pack are sequentially arranged according to the sequence number of the segment, thereby forming the content packets required by the application 1101, and the cellular session 1111 and the Wi-Fi. The repacked segments that are distributed and received through the session 1112 are depacked based on the aforementioned packing information 913 including the segment.

12 illustrates a flow in which the preprocessor 1102 performs this depacking process. According to the depacking process illustrated in FIG. 12, when one segment is received, first, the segment type in the packing information is checked (S1201), and if the type is 'reinforced', it is temporarily stored (S1204) and 'base'. In the case of, it is checked whether a segment of the type "reinforcement" associated with it (ie, having P and B pictures predicted from the I picture) is stored (S1202). The associated segment may be, for example, a segment having a sequence number immediately after the sequence number of a segment of the current 'base' type. If it is not stored, it waits for a specific condition (S1203). The specific condition may be a time when a current base segment is required, for example, an underrun of a buffer that the application 1101 for playing uses to receive content data.

If the segment of the 'reinforcement' type associated with the received 'base' type segment is not received until the specific condition is reached, the preprocessor 1102 may determine the encoding information described in the packing information of the segment. Is created and inserted by the repacking processor 901 in the distribution control server 100 so as to become header information of the content packet provided to the application 1101 for the play (S1211). At this time, if necessary, the picture header information of the I picture included in the segment is appropriately corrected. The header information of the packet included in the data pack of the received base segment is removed so that the header information of the configured packet becomes a header of a content packet composed of I pictures.

Accordingly, the content packet consisting only of I pictures and the audio packet included in the data pack of the base segment are delivered to the application 1101 for the play, and the application 1101 is configured to provide continuous audio data with the I pictures. Decode and output to the user.

In the depacking process, if the type of the received segment is 'base' and the segment of the 'reinforcement' type associated with it is stored in advance or received before the specific condition, the preprocessing processor 1102 is connected to the corresponding segment. Based on the depacking information (packet number 831, position in the packet (pt _k ), etc.) of the packing information described in the header of the packet, the contents are restored to the respective content packets (S1212). It is provided to the application 1101.

According to the above-described embodiments, when the terminal 3 ₁ passes through any Wi-Fi zone, a relatively large amount of traffic in the Wi-Fi zone is compared with that of the cellular network without causing any disruption to the current content play. Receiving data reduces the load on the cellular network. In addition, even if the reception of content data is temporarily not smooth due to a lack of cellular network resources, the relatively high quality I pictures obtained through the Wi-Fi network 2 and the provision of a seamless audio signal may be used. You can enjoy watching and watching in succession.

On the other hand, during the simultaneous transmission over the heterogeneous network after the repacking process as described above, if the session of the Wi-Fi network is released or the segment transmitted through the session is not acknowledged (acknowledged), it is associated with the last response base segment After the reinforcement segment (segment number “N + k + 1” in FIG. 10) is transmitted, segments of the block division method are transmitted.

In FIG. 10, there is shown one reinforcement segment that is transmitted through the cellular session 20 when the Wi-Fi session 21 is released or the segment has not responded, but this is only an example, and the Wi-Fi session is shown only. If the data transfer via 21 is relatively very fast, the base segments may be sent much faster than the reinforcement segments. In this case, block-segmented segments will be sent after a significant number of reinforcement segments associated with the last transmitted base segment and the previous transmitted base segments are sent to the cellular session 20.

In another embodiment according to the present invention, the reinforcing segment (eg, the segment “N + k + 1” in FIG. 10) associated with the last corresponded base segment may not be transmitted. In this embodiment, when the Wi-Fi session 21 is released or the segment is not answered, the load of the service area of the cellular network 10 where the terminal 3 ₁ using the content distribution transmission service is located is located. By reference, it is determined whether to transmit the currently untransmitted reinforcement segment associated with the base segment already transmitted. For example, if the load of the corresponding service area is more than an appropriate level, it is decided not to transmit the unsent reinforcement segment, and I, which is included in the previously transmitted base segment, is transmitted without being transmitted through the cellular network 10. Blocks are first transmitted from content packets with I pictures after the picture and transmitted as segments.

In the embodiment described with reference to FIG. 10, the base segment was transmitted in a high speed Wi-Fi session and the reinforcement segment was transmitted through a cellular session in a mobile phone network. However, depending on the nature of the content or if it is encoded, the insertion interval of an I picture in the content may be quite long. That is, the data of the P and B pictures in the video packets may be larger than the I picture. Thus, in another embodiment according to the present invention, the distribution processor 1001 in the distribution control server 100 allows a base segment to the cellular session 20 and a reinforcement segment to the Wi-Fi session 21. Can also be sent. That is, the distribution processor 1001 selects a session for continuously transmitting the base segment after checking the size and each type of the segments received from the repacking processor 901 from the header information.

When a reinforcement segment is transmitted through the Wi-Fi session 21 according to the present embodiment, if the Wi-Fi session 21 is released or a segment transmitted through the session is not acknowledged, repacking is performed. Stops the transmission of the received segment, and transmits the reinforcement segment associated with the base segment transmitted through the cellular session 20 through the cellular session 20 until then, and then executes the segment of the block division method described above. It is configured to transmit through the cellular session 20. In another embodiment according to the present invention, as described above, according to the load degree of the corresponding service area in the cellular network 10, a segment of a block division scheme is formed immediately without transmission of the reinforcement segment associated with the transmitted base segment. To transmit via the cellular session 20.

In the above-described embodiment, the session for transmitting the base segment is determined according to the size of the segment, but may be determined according to other factors. For example, a session connected through a network having higher reliability of data transmission may be determined as a session to transmit a base segment. If only reliability of data transmission is the basis for session selection, a cellular session is usually determined as a transmission session of a base segment because a cellular network has a higher reliability of data transmission than a Wi-Fi network.

The preprocessing processor 1102 executed in the terminal 3 ₁ according to whether or not through which session the base segment is received according to whether or not until the specified condition of the reinforcement segment associated with the received base segment is reached As described above, the content packet may be configured by the base segment alone or from the base and the reinforcement segment, and delivered to the application 1101 for the play.

In the above-described embodiments, when the content source (for example, the content file) selected by the terminal 3 ₁ is in a state capable of accessing the Wi-Fi network, both networks 10 and 2 are transmitted together. / Received. In another embodiment according to the present invention, while the Wi-Fi network is accessible, the content is expressed in the same content (as video and audio or, optionally, as subtitles), but in terms of the presentation quality, different content sources are transmitted (just before). A content source that is separate from the existing content source) may be alternately transmitted for a section corresponding to the same content. Here, the expression quality is different, for example, in the case of video content, the number of frames per second, the image size and the like is different. In the present embodiment, when the Wi-Fi session with the terminal is established, the distribution control server 100 has the same content of higher quality than the content source being transmitted until the session is released or there is no response to the transmitted segment. Content Source (This content source is a content source of an associated set of content provided and provided from the content server 110 to the distribution control server 100 upon initial selection of content to stream from the terminal.) Will transmit the next interval in. 13A and 13B illustrate this transmission method. FIG. 13A illustrates a case of segment transmission of the block division method of FIG. 6, and FIG. 13B illustrates a case of segment transmission of the repacking method. As shown in Figs. 13A and 13B, while the terminal is accessing a Wi-Fi session, it selects a higher quality content source 1302 within the set 1300 of the content source 1301 it was transmitting. Subsequent sections 1310 in the content source 1302 are transmitted, so that hatched sections in the drawings are alternately transmitted in sequence from the plurality of content sources. Of course, in the embodiment of the repacking method, as illustrated in FIG. 13B, the base segment may be repacked for the section 1310 of the newly selected high-quality content source 1302 when the Wi-Fi session is established. 1321 and reinforcement segment 1322 in the form of transmissions through both sessions.

In the description of the above embodiments, it is assumed that the wireless network used in addition to the public mobile telephone communication network is single. However, what has been described as an embodiment so far can be extended to use a plurality of wireless networks at the same time by changing, replacing, replacing or adding an extremely simple matter. For example, even when data is transmitted in combination with one Wi-Fi network by the above-described process, a connection of a third wireless network that is able to transmit a request for accessing resource information of another wireless network and access it accordingly If there is a resource report, the session can be established through the third wireless network, and then the segment of the block division method or the segment of the repacking method can be distributed and transmitted through the opened third session.

According to the embodiments described in detail above, while a certain terminal occupies the communication resources of the cellular network and uses the service of data transmission and reception, the Wi-Fi network capable of relatively high-speed service, although the service area is dispersed Alternatively, when passing through an accessible space of various other wireless networks, a large amount of data is transmitted and received in the space, thereby reducing the amount of resource occupancy from the cellular network. In particular, when the terminal is accessible to a plurality of wireless networks, it can reduce the load on the cellular network by converting a large amount of data to be transmitted through the cellular network in a shorter time. There is a number.

As mentioned above, preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art can improve other various embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. Changes, substitutions or additions will be possible.

2: Wi-Fi network _2k : Wi-Fi zone
_3k : terminal 5: Wi-Fi independent network
10: cellular network 20: wired internet network
100: distribution control server 110: content server
120: access control server 130: central operation server

Claims (6)

In the method for providing data by using a heterogeneous network comprising a first network and a second network,
Transmitting content data to a terminal connected through the first network;
When the terminal is connected through the second network, determining a point at which a portion of the data that is not currently transmitted of the content data is skipped;
The transmission of the skipped content data of the partial section over the first network and the transmission of the content data having a representation of a section after the determined point to the terminal through the second network at the same time A method comprising the steps of performing. The method of claim 1,
Wherein the determining comprises:
Based on a temporal factor including time required for seamless continuous playback of previously transmitted data of content data transmitted through the second network and time of data processing required for data transmission through the second network. Determining a duration of data transmission over the first network;
And determining the section of the content data that takes the determined duration at the time of playing as the partial section. The method of claim 1,
The transmission to the terminal includes a block in which the content data is divided, and the number of the order of transmission is in the unit of segments included in the header. The method of claim 1,
The step of performing the transmission to the terminal at the same time may include a base segment and an enhancement segment for the content packet constituting the content data, wherein the base segment includes the first network and the second network. Through one of the networks, the reinforcement segment is transmitted through the other network,
The base segment includes an infrastructure picture of a video packet of the content packet and an audio packet of the content packet, and the reinforcement segment includes all or part of a picture type that is predicted from another picture in the video packet. Include types of pictures,
And each segment is provided with a header including a sequence number assigned according to the data order of the content data and packing information necessary for reconstruction of a video packet and / or audio packet from the segment. The method of claim 1,
The content data having the representation content of the section after the determined point is the content data of the section continued in the skipped partial section, or has a different presentation quality from the content source including the data of the partial section. The content data on a content source that is separate from the source. The method of claim 1,
The step of performing transmission to the terminal at the same time may include distributing the content data having the content of the section after the determined point through one or more third networks other than the first and second networks. Transmitting to the terminal.

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