JP5752231B2 - Method and apparatus for providing time shift service in digital broadcasting system and system thereof - Google Patents

Description

  The present invention relates to a method and apparatus for providing a time shift service, and more particularly, to a method and apparatus for providing a time shift service in a digital broadcasting system and the system.

  Recently, in digital broadcasting systems, the importance of smooth content distribution has been recognized due to the increase in users who use online content. For this reason, attention is paid to an adaptive streaming technique in which the bit rate of content is smoothly changed according to changes in usable transmission bandwidth and / or user device performance. Such adaptive streaming technology optimizes the bit rate by analyzing the user's network environment. In this way, as in the case of adaptive streaming, the user terminal selects and plays back a content unit that is divided into small parts based on the Hypertext Transfer Protocol (HTTP) based on the situation, so that the user can perform without delay. Content distribution technologies that enable content to be used are discussed in various standards organizations.

  In the era of Convergence based on the Internet Protocol (IP), convergence of communication and broadcasting is attracting attention as one of the next generation market leading technologies as a next generation new business model. In particular, Internet Protocol TeleVision (IPTV) is not only offering a new service that combines or integrates existing TV, voice, and data technologies, but also supports interactivity. It is a technology that can create new business models and services. In particular, the IPTV technology is different from the service distribution technology specialized in a limited terminal environment, and the IPTV technology allows a service to be performed on a fixed type terminal (for example, a set-top box, PCs and TVs) and mobile terminals (eg, mobile phones and personal digital assistants (PDAs)), wired / wireless networks, and broadcast networks can be used to provide and apply the same services in various environments In addition, it is possible to develop various forms of services in consideration of various environments.

  While the broadcast content is being played, the user can select and view the content that has already been played. In general, this is called a 'time shift' function. It is common for devices that support the time shift function to include storage devices (eg, buffers, hard disks, and memories) having specific capacities. However, in this case, the time shift function may be limited to the capacity that can be stored in the storage device. In other words, in the prior art, it is not possible to provide a time shift function for content that has been played before recent content of a particular size stored and / or a portion of the same content. Similarly, the time shift function cannot be provided when content of a specific size is stored in a server on a network that is not a device. In the prior art, time shift buffer depth information is transmitted to the client using a multimedia presentation description (MPD). The value of timeShiftBufferDepth indicates the period during which the server buffers segments. Therefore, in the prior art, after the ‘representation time’ + “time shift buffer depth (representation time + timeShiftBufferDepth)” of each segment has elapsed, the related segment cannot be accessed.

  An object of the present invention is to address at least the above-mentioned problems and / or disadvantages and to provide at least the following conveniences. That is, an object of the present invention is to provide a method and apparatus for providing a time shift service in a digital broadcasting system, and a system therefor.

  In order to achieve the above object, according to one aspect of the present invention, a system for providing content in a digital broadcasting system is provided. The system for providing the content stores the segment after the buffering time of the segment of the content elapses, and the updated multimedia including uniform resource location (URL) information indicating the position where the segment is stored A server that transmits a presentation description (MPD); receives the updated multimedia presentation description; and stores the stored segment at a location indicated by the URL information included in the updated multimedia presentation description. And a client device to acquire.

  In accordance with another aspect of the present invention, a method for providing content by a server in a digital broadcasting system is provided. The method includes the step of storing the segment after the segment buffering time has elapsed, and an updated multimedia presentation disc including uniform resource location (URL) information indicating the location where the segment is stored. Transmitting a description (MPD) to the client device.

  According to still another aspect of the present invention, a server apparatus that provides content for digital broadcasting is provided. The server device stores an updated multimedia presentation description including a uniform resource location (URL) information storing the segment and indicating a position where the segment is stored after a buffering time of the segment of the content elapses. (MPD) is transmitted to the client device.

  According to yet another aspect of the invention, a method is provided for a client device in a digital broadcasting system to obtain content. Receiving the updated multimedia presentation description (MPD) including the uniform resource location (URL) information of the server storing the segment after the buffering time of the segment of content has elapsed; Obtaining the stored segment at the position indicated by the URL information included in the updated multimedia presentation description.

  According to yet another aspect of the invention, a client device for receiving digital broadcast content is provided. The client device receives an updated multimedia presentation description (MPD) including a uniform resource location (URL) information of a server storing the segment after the buffering time of the segment of the content elapses; The stored segment is acquired at a position indicated by the URL information included in the updated multimedia presentation description.

  According to still another aspect of the present invention, a server apparatus that provides content for digital broadcasting is provided. The server device stores storage means for storing the content segment after the buffering time of the content segment elapses, and uniform resource location (URL) information indicating the position where the segment is stored in the storage means. And a transmission means for transmitting the updated multimedia presentation description (MPD) including the transmission to the client device.

  According to still another aspect of the present invention, a client device for receiving content for digital broadcasting is provided. The client device receives an updated multimedia presentation description (MPD) including a uniform resource location (URL) information of a server storing the segment after the buffering time of the segment of the content has elapsed. Means for acquiring the stored segment at the position indicated by the URL information included in the updated multimedia presentation description.

  After the broadcast time of the broadcast content, the client user can always request and view past broadcast content.

  The foregoing and other aspects, features, and advantages of embodiments of the present invention will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, in which:

FIG. 3 conceptually illustrates definitions of terms related to time used in a digital broadcasting system according to an embodiment of the present invention. 7 is a flowchart illustrating an operation of a server executed according to whether or not a “Ttimeshift” time exists between a “timeShiftAvailabilityStart” time point and a “NOW” time point according to an exemplary embodiment of the present invention. It is a flowchart which shows the operation | movement between each apparatus by the 1st Embodiment of this invention. It is a flowchart which shows the operation | movement between each apparatus by the 1st Embodiment of this invention. It is a flowchart which shows the operation | movement between each apparatus by the 2nd Embodiment of this invention. It is a flowchart which shows the operation | movement between each apparatus by the 3rd Embodiment of this invention. It is a flowchart which shows the operation | movement between each apparatus by the 4th Embodiment of this invention. It is a flowchart which shows the operation | movement between each apparatus by the 4th Embodiment of this invention. It is a flowchart which shows the operation | movement between each apparatus by the 5th Embodiment of this invention. It is a flowchart which shows the operation | movement between each apparatus by the 5th Embodiment of this invention.

  In the drawings, it is to be understood that like reference numerals refer to like parts, components, and structures.

  The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the embodiments of the present invention as defined in the appended claims and their equivalents, Various specific details are included to aid this understanding, but are only one embodiment. Accordingly, it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments described herein without departing from the scope or spirit of the invention. In addition, from the viewpoints of clarity and conciseness, detailed descriptions of functions and configurations well known to those skilled in the art are omitted.

  The terms and words used in the following description and claims are not limited to the dictionary meaning, but are used by the inventor to make the understanding of the present invention clear and consistent. Accordingly, it is to be defined based on the following claims and their equivalents, and the description of the embodiments of the present invention is merely provided for illustrative purposes and is intended to limit the purpose of the present invention. It will be clear to those of ordinary skill in the art of the present invention.

  It will be understood by those skilled in the art that “a”, “an”, and “the”, ie, the singular forms in the English specification, include the plural unless the context clearly dictates otherwise. . Thus, for example, reference to “a component surface” includes one or more surfaces.

  In the description set forth below, for further understanding of the present invention, the terminology of entities defined in the Open Internet Protocol Television (IPTV) Forum (OIPF) standard is used. The scope of the present invention is not limited but can be applied to any system having a similar technical background.

  In an embodiment of the present invention, when a client receives a live stream from a server using a hypertext transfer protocol (HTTP) -based adaptive streaming method, the client requests to play back content that has been returned to the past. Then, a method and system for servicing content according to this request is proposed.

  FIG. 1 is a diagram conceptually illustrating definitions of terms related to time used in a digital broadcasting system according to an embodiment of the present invention. These terms refer to 3GPP TSG-SA4 MBS Adhoc # 6, which is a 3rd Generation Partnership Project (3GPP) standard document.

  'AvailabilityStartTime + Periodstart' time 100 is the availability time for getting the first segment in the Representation of the Period. means.

  The time shift availability start (timeShiftAvailabilityStart) time 102 is a time during which the broadcast service can be time shifted. This value is determined by subtracting “timeShiftBufferDepth” 108 from “NOW” 104.

  'NOW' time 104 means the current time that the user is consuming content.

  The 'availabilityEndTime' time 106 means an available end time for a segment in the multimedia presentation description (MPD). 'TimeShiftBufferDepth' 108 means a content buffering period for providing a time shift service at a server for live presentation.

  FIG. 2 is a flowchart illustrating an operation of a server executed according to whether or not a ‘Ttimeshift’ time exists between a ‘timeShiftAvailabilityStart’ time and a ‘NOW’ time according to an embodiment of the present invention. The 'Ttimeshift' time means the broadcast time of the segment that the user wants to jump and play.

  In step 200, the server determines whether 'Ttimeshift' time exists between 'timeShiftAvailabilityStart' time and 'NOW' time. If it is determined at step 200 that 'Ttimeshift' time exists between 'timeShiftAvailabilityStart' time and 'NOW' time, the server at step 202 at the time requested by the client using the current MPD file. Send the corresponding segment to the client. However, if, in step 200, the 'Ttimeshift' time does not exist between the 'timeShiftAvailabilityStart' time and the 'NOW' time, the server in step 204, the network personal video recorder (nPVR) or network It is determined whether or not it has a function of storing segments using the above content storage device. If, in step 204, it is determined that the server does not have the capability to store segments using nPVR or a content storage device on the network, the server sends an error message to the client in step 206. However, if it is determined at step 204 that the server has the capability to store segments using the nPVR or content storage device on the network, then the server determines that the content storage device on the nPVR or network is at step 208. Provide a time shift service using other dedicated MPD files to support. The embodiments of the present invention described below relate to a method for providing a time shift service using an nPVR or a content storage device on a network.

  MPD files that are newly created to provide time-shifting services using nPVR or content storage devices on the network require additional attribute values as shown in Table 1 described below. In Table 1, “Broadcast start Time” and “Broadcast end Time” indicate times actually broadcast using the MPD related to the content. That is, 'Broadcast start Time' indicates a start time when the content is actually broadcasted in the past, and 'Broadcast end Time' indicates an end time when the content is actually broadcasted in the past.

  The information in Table 1 can be sent to the client using other methods, such as a method of sending individual messages, instead of a method of sending MPD attribute values. Embodiments of the present invention include all methods by which the information in Table 1 can be sent to the client. Uniform Resource Location (URL) information indicating each representation or segment also changes. Table 1 shows the information that must be sent to the client according to an embodiment of the present invention.

  A method for providing a time shift service according to the first embodiment of the present invention will be described with reference to FIGS. 3 and 4.

  3 and 4 are flowcharts showing the operation between the devices according to the first embodiment of the present invention. 3 and 4 are one figure, but are separated into two figures for convenience of explanation. In the first embodiment of the present invention, when the live broadcast content server 300 finishes buffering for each segment in the adaptive streaming support process, the live broadcast content server 300 may not be buffered any more. Is transmitted to the content storage device 302 on the nPVR or network.

  A content distribution server 304, which is a server managed by a service provider that supports an HTTP adaptive streaming service, generates an MPD file associated with the content, and transmits the generated MPD file to the client 306. The live broadcast content server 300 corresponds to an HTTP server that actually has and provides content for live broadcasting. The content storage device 302 on the nPVR or the network is a storage managed by a service provider or a network service operator. The above three entities, the live broadcast content server 300, the nPVR, or the content storage device 302 on the network, and the content distribution server 304 are implemented as independent logical entities, It can actually be realized as two physical entities.

  In step 308, the content distribution server 304 generates an MPD file for supporting adaptive streaming of live broadcast content, and transmits (distributes) the generated MPD file to the client 306 in step 310.

  In step 312, the client 306 and the live broadcast content server 300 set up an HTTP session. More specifically, in step 312a, the client 306 sets the HTTP session to the URL of the live broadcast content server 300. In step 312b, the live broadcast content server 300 transmits a segment corresponding to the MPD file to the client 306 using an HTTP session. In the process of supporting adaptive streaming, at the time 314 when buffering of each segment ends, the live broadcast content server 300 transmits the content segment to the storage device nPVR or the content storage device 302 on the network in step 316. . In step 318, the content storage device 302 on the nPVR or network stores this received content segment for a specified time. As time passes, each segment is continuously distributed from the live content server 300 and stored in the content storage device 302 on the nPVR or network.

  Accordingly, in step 320, the content storage device 302 on the nPVR or the network stores the stored information of the stored segment, for example, information about the location of the server where the segment is stored (eg, URL information) and the actual broadcasted broadcast. Information about time is transmitted to the content distribution server 304. In step 322, the content distribution server 304 generates a dedicated MPD for the time shift service.

  In step 324, the client 306 requests that the content distribution server 304 perform a time shift to the segment broadcast before the “timeShiftAvailabilityStart” time. In step 326, the content distribution server 304 transmits a dedicated MPD for the time shift service to the client 306 in response to the request in step 324. In step 328, the client 306 sets up an HTTP session to the nPVR or the content storage device 302 on the network. More specifically, in step 328a, the client 306 sets the HTTP session to the URL of the nPVR or the content storage device 302 on the network where the related file is stored according to the MPD received in step 326. In step 328b, the content storage device 302 on the nPVR or the network transmits the segment requested by the client 306 to the client 306 using an HTTP session. The content distribution server 304 continuously generates new MPDs for the time shift service in step 322 based on the information received in step 320. At this time, in step 326, the content distribution server 304 continuously transmits the MPD to the client 306 as time elapses.

  In step 326, the content distribution server 304 also transmits the check time related information together with the MPD for checking when the next MPD update arrives for the next MPD update. Therefore, the MPD update process of the client 306 corresponding to step 350 of FIG. 4 must be repeated periodically. Step 350 will be described in more detail as follows.

  In the process of supporting adaptive streaming, at the time 352 when the buffering of each segment ends, the live broadcast content server 300 transmits the content segment to the storage device nPVR or the content storage device 302 on the network in step 354. In step 356, the content storage device 302 on the nPVR or network stores this received content segment for a specified time. As time elapses, the segments are continuously distributed from the live content providing server 300 and stored in the content storage device 302 on the nPVR or the network.

  Accordingly, in step 358, the content storage device 302 on the nPVR or network stores the stored information of the stored segment, eg, information about the server location where the segment is stored (eg, URL information), and the actually broadcasted broadcast. Information about time is transmitted to the content distribution server 304. In step 360, the content distribution server 304 generates a modified MPD instance.

  On the other hand, when the check time comes in step 362, the client 306 requests the content distribution server 304 to update the changed MPD in step 364. In step 366, the content distribution server 304 transmits the updated MPD to the client 306.

  As a result, for live streaming time shift support, the MPD for content stored in nPVR or content storage 302 on the network is regenerated in a form that requires persistent updates.

  For the update time point, the update may be performed periodically using a check time or may be performed by an event.

  As a second embodiment of the present invention, when the broadcast time of a segment that can be provided using a corresponding MPD expires, the live broadcast content server 500 stores the corresponding content segment in the nPVR or content storage on the network. A method for transmitting to the device 502 and storing it will be described. When using such a method, if the client requests a segment related to the time that content is not buffered at the server due to time shift among the segments that can currently be provided in the MPD file, ie, An error may occur when a client requests a segment that satisfies availabilityStartTime + Periodstart <Ttimeshift <timeShiftAvailabilityStart.

  However, there may be inconvenience that the service provider has to send and store segments in real time and continue to change the MPD according to information about the stored segments. Accordingly, the service provider may select a method for providing adaptive streaming by storing content in the nPVR or the content storage device 502 on the network in units of segments including one MPD file or in units of one program. it can. In this case, the MPD file needs a new attribute indicating whether or not the segment managed by the corresponding MPD can be time-shifted. When the value of this attribute is “True”, the content segment received using the corresponding MPD file is valid for the corresponding MPD, that is, during the check time or availabilityEndTime that is the update time of the next MPD. New information corresponding to an existing MPD file for live streaming broadcasting by carrying information related to the segment to be broadcast to the content distribution server 504 from the nPVR or the content storage device 502 on the network at a time. MPD is generated. The new MPD includes URL information of each segment and information indicating the past broadcast time.

  The operation between the devices according to the second embodiment of the present invention will be described with reference to FIG.

  Referring to FIG. 5, in step 508, the content distribution server 504 generates an MPD file for supporting adaptive streaming resources of live broadcast content, and transmits the generated MPD file to the client 506 in step 510.

  In step 512, the client 506 and the live broadcast content server 500 set up an HTTP session. More specifically, in step 512a, the client 506 sets the HTTP session to the URL of the live broadcast content server 500. In step 512b, the live broadcast content server 500 transmits the segment requested by the client 506 to the client 506 using an HTTP session.

  If the corresponding MPD availability time in step 514, ie, the time between 'availabilityStartTime' and 'availabilityEndTime', expires, the live broadcast content server 500 in step 516 returns to the nPVR or on the network. The content segment stored in the content storage device 502 is transmitted to the nPVR or the content storage device 502 on the network. In step 518, the content storage device 502 on the nPVR or network stores a segment managed by one MPD. In step 520, the content storage device 502 on the nPVR or the network stores the stored information of the stored segment, for example, information on the server location where the segment is stored (eg, URL information), and the broadcast on which the segment is actually broadcast. Information related to time and the like is transmitted to the content distribution server 504.

  In step 522, the content distribution server 504 generates a dedicated MPD for the time shift service. In step 524, the client 506 requests the content distribution server 504 to perform a time shift to the segment broadcasted before the “timeShiftAvailabilityStart” time. In step 526, the content distribution server 504 transmits a dedicated MPD for the time shift service to the client 506 in response to the request in step 524. In step 528, the client 506 sets up an HTTP session to the nPVR or the content storage device 502 on the network. More specifically, in step 528a, the client 506 sets the HTTP session to the URL of the nPVR or content storage device 502 on the network where the associated file is stored according to the MPD received in step 526. In step 528b, the content storage device 502 on the nPVR or the network transmits the segment requested by the client 506 to the client 506 using an HTTP session.

  Table 2 shows the MPD that must be transmitted from the content distribution server 504 to the client device 506 according to the second embodiment of the present invention described above.

  A method of updating segment information for each content unit and updating an MPD file for managing an nPVR storing a segment or a content storage device on a network will be described.

  FIG. 6 is a flowchart showing operations between devices according to the third embodiment of the present invention.

  Referring to FIG. 6, in step 608, the content distribution server 604 generates an MPD file for supporting adaptive streaming of live broadcast content, and transmits the generated MPD file to the client 606 in step 610.

  In step 612, the client 606 and the live broadcast content server 600 set up an HTTP session. More specifically, in step 612a, the client 606 sets an HTTP session in the URL of the live broadcast content server 600. In step 612b, the live broadcast content server 600 transmits the content file of the corresponding segment to the client 606 using the HTTP session.

  When the buffering time of each segment expires in step 614, the live broadcast content server 600 transmits the buffered segment to the nPVR or the content storage device 602 on the network in step 616. In step 618, the content storage device 602 on the nPVR or network stores the segment corresponding to each program using the program information in the MPD, and transmits the associated URL and broadcast time information to the content distribution server 604 in step 620. To do. In step 622, the content distribution server 604 generates MPD for each program based on the received information. When a request for content whose broadcast time has expired is received from the client 606 in step 624, an MPD file for the requested content is transmitted to the client 606 in step 626. In step 628, the client 606 sets up an HTTP session to the nPVR or the content storage device 602 on the network.

  More specifically, in step 628a, the client 606 sets an HTTP session to the URL of the nPVR or the content storage device 602 on the network in which the MPD file is stored according to the MPD received in step 626. In step 628b, the content storage device 602 on the nPVR or the network transmits the file requested by the client 606 to the client 606 using an HTTP session.

  A method for providing an adaptive streaming service includes live broadcasts that are considered as one Content-On-Demand (CoD) content.

  Table 3 set forth below shows a typical live broadcast MPD format.

  Table 4 set forth below shows MPD embodiments used in the present invention. Unlike Table 3, Table 4 includes the “Broadcast start Time”, “Broadcast end Time”, and “Timeshift” attributes defined in Tables 1 and 2 according to the first and second embodiments of the present invention. The MPD format is shown.

  In the fourth embodiment of the present invention, as shown in Table 5, a URL or URI value from which a dedicated MPD for nPVR can be fetched can be inserted into the live broadcast MPD.

  7 and 8 are flowcharts showing the operation between the devices according to the fourth embodiment of the present invention. 7 and 8 are one figure, but are separated into two figures for convenience of explanation.

  Referring to FIG. 7, steps 708 to 720 are substantially the same as steps 308 to 320 of FIG.

  In step 722, the content distribution server 704 generates a dedicated MPD for the nPVR service.

  In step 724, the user requests content before the content stored at 'timeShiftBufferDepth' time to request a time shift to the segment broadcast before 'timeShiftAvailibilityStart' time. Thereafter, in step 726, the client 706 connects to the location (URL or URI) specified in the 'nPVR_MPD_link' attribute as shown in Table 5 and creates a new for the content storage device 702 on the nPVR or network. A request for MPD is transmitted to the content distribution server 704. In step 728, the content distribution server 704 transmits a dedicated MPD for nPVR service to the client 706 in response to the request received in step 726.

  Since Steps 730 to 756 are substantially the same as Steps 328 to 366 of FIGS. 3 and 4, detailed description thereof is omitted.

  The fifth embodiment of the present invention described with reference to FIGS. 9 and 10 changes the existing URL value to the URL value of the nPVR in which the segment is stored through the MPD update process.

  FIG. 9 and FIG. 10 are flowcharts showing the operation between the devices according to the fifth embodiment of the present invention. 9 and 10 are one figure, but are separated into two figures for convenience of explanation.

  Referring to FIG. 9, since steps 908 to 920 are substantially the same as steps 708 to 720 of FIG. 7, detailed description thereof will be omitted.

  In step 922, the content distribution server 904 generates a new MPD by using the URL of the nPVR or content storage device 902 on the network received from the nPVR or network content storage device 902 in step 920 and the past broadcast time information. Generate. In step 922, the content distribution server 904 changes the existing URL value for the corresponding segment to the URL value of the content storage device 902 on the nPVR or network. In addition, by changing the time information of the existing MPD that is the past broadcast time information, the content distribution server 904 allows the segment presentation time to be broadcast live even when the user views the segment later. The time information of the MPD is adjusted so that can be shown. In other words, MPD's 'availabilityStartTime' is fixed to the conventional 'availibitlityStartTime'. Thus, even if the position changes, the effective start time of the corresponding segment is fixed to the existing start time when the segment was broadcast.

  When the check time is reached in step 924, the client 906 transmits an update request for the MPD changed in step 926 to the content distribution server 904. In step 928, the content distribution server 904 transmits the MPD value generated in step 922 to the client 906.

  Steps 930, 930a, and 930b in FIG. 10 are substantially the same as steps 730, 730a, and 730b in FIG. 7, and thus detailed description thereof is omitted.

  While the invention has been illustrated and described with reference to specific embodiments, various changes in form and detail can be made without departing from the spirit and scope of the invention as defined by the appended claims. Certainly it will be apparent to those with ordinary knowledge in the art.

  Embodiments of the present invention can be implemented in the form of hardware, software, or a combination of hardware and software. Such optional software can be, for example, a volatile or non-volatile storage device such as a storage device such as a ROM, or a RAM, memory chip, for example, whether or not deletion or re-recording is possible. , Or a memory such as a device or an integrated circuit, or an optically or magnetically readable medium such as a CD, DVD, magnetic disk or magnetic tape. The storage device and the storage medium are embodiments of a machine-readable storage device adapted to store a program or program containing instructions for implementing the embodiments of the present invention. Accordingly, embodiments of the present invention provide a program comprising code for implementing a system or method as claimed in any one of the claims herein and a machine readable storing such a program. A storage device is provided. Moreover, such a program is electronically transferred through any medium such as a communication signal carried through a wired or wireless connection, and the embodiments appropriately include the equivalents thereof.

  In the detailed description and claims of this application, “comprise”, “contain”, and variations thereof, eg, “comprising” and “comprises” are included, Means “but but not limited to” and is not intended (and does not exclude) other moieties, additives, components, finished products or steps. .

  Throughout this description and the claims, the singular includes the plural unless the context demands otherwise. In particular, when undefined objects are used, it should be understood that the plural is considered as well as the singular unless the context requires different.

  It will be appreciated that the features, mergers, characteristics, composites or groups described with a particular aspect, embodiment or example of the invention are applicable to the other aspects, embodiments or examples described herein unless otherwise incompatible.

  In the description and claims of this application, a general form of language, generally “X for Y”, where Y is any action, action or step, and X is such an action, action or step. The expression “any means for performing a step” includes, but is not limited to, means X that are set or applied to perform Y.

IP Internet Protocol URL Uniform Resource Location HTTP Hypertext Transfer Protocol
IPTV Internet Protocol TeleVision
MPD Multimedia Presentation Description (Multimedia Presentation Description)
nPVR network personal video recorder

Claims (19)

A system for providing content in a digital broadcasting system,
After the content segment buffering time has elapsed, store the segment and send an updated multimedia presentation description (MPD) containing uniform resource location (URL) information indicating the location where the segment is stored. And a server to
A client device that receives the updated multimedia presentation description and obtains the stored segment at a location indicated by the URL information included in the updated multimedia presentation description;
I have a,
The updated multimedia presentation description is generated at the server through a multimedia presentation description update process between the server and network storage,
The system is transmitted to the server from a content provider, and is stored in the network storage after the buffering time of the segment elapses . A method in which a server in a digital broadcasting system provides content comprising:
The server storing the segment after the buffering time of the segment of content has elapsed;
The server sends an updated multimedia presentation description (MPD) including uniform resource location (URL) information indicating a location where the segment is stored to a client device;
I have a,
The updated multimedia presentation description is generated at the server through a multimedia presentation description update process between the server and network storage,
The method is characterized in that the segment is transmitted from the content provider to the server and stored in the network storage after the segment buffering time has elapsed . A server device that provides content for digital broadcasting,
The server device stores the segment after the buffering time of the segment of content has elapsed, and an updated multimedia presentation description including uniform resource location (URL) information indicating a location where the segment is stored (MPD) is sent to the client device ,
The updated multimedia presentation description is generated at the server through a multimedia presentation description update process between the server and network storage,
The server apparatus is characterized in that the segment is transmitted from the content provider to the server, and stored in the network storage after the buffering time of the segment elapses . A method for a client device in a digital broadcasting system to acquire content, comprising:
The client device receives an updated multimedia presentation description (MPD) including a uniform resource location (URL) information of a server in which the segment is stored after a buffering time of the segment of content has elapsed. When,
The client device obtaining the stored segment at a location indicated by the URL information included in the updated multimedia presentation description;
Have
The updated multimedia presentation description is generated at the server through a multimedia presentation description update process between the server and network storage,
The method is characterized in that the segment is transmitted from the content provider to the server and stored in the network storage after the segment buffering time has elapsed . A client device for receiving content for digital broadcasting,
The client device receives an updated multimedia presentation description (MPD) including a uniform resource location (URL) information of a server in which the segment is stored, after a buffering time of the segment of the content elapses; Obtaining the stored segment at the location indicated by the URL information included in the updated multimedia presentation description ;
The updated multimedia presentation description is generated at the server through a multimedia presentation description update process between the server and network storage,
The client device according to claim 1, wherein the segment is transmitted from the content provider to the server, and stored in the network storage after a buffering time of the segment elapses . A server device that provides content for digital broadcasting,
A storage means for storing the content segment after the buffering time of the content segment has elapsed, and an updated multimedia including uniform resource location (URL) information indicating a position where the segment is stored in the storage means Transmitting means for transmitting a presentation description (MPD) to the client device;
I have a,
The updated multimedia presentation description is generated at the server through a multimedia presentation description update process between the server and network storage,
The server apparatus is characterized in that the segment is transmitted from the content provider to the server, and stored in the network storage after the buffering time of the segment elapses . A client device for receiving content for digital broadcasting,
Receiving means for receiving an updated multimedia presentation description (MPD) including uniform resource location (URL) information of a server storing the segment after the buffering time of the segment of content has elapsed;
Obtaining means for obtaining the stored segment at a position indicated by the URL information included in the updated multimedia presentation description;
I have a,
The updated multimedia presentation description is generated at the server through a multimedia presentation description update process between the server and network storage,
The client device according to claim 1, wherein the segment is transmitted from the content provider to the server, and stored in the network storage after a buffering time of the segment elapses .   The system of claim 1, wherein the multimedia presentation description includes information about a time at which the segment was actually broadcast.   5. A method according to claim 2 or 4, wherein the multimedia presentation description comprises information about the time when the segment was actually broadcast.   7. The server apparatus according to claim 3, wherein the multimedia presentation description includes information regarding a time when the segment is actually broadcasted.   The client device according to claim 5 or 7, wherein the multimedia presentation description includes information about a time when the segment is actually broadcasted.   The system of claim 1, wherein the multimedia presentation description is updated in at least one of a unit of the segment and a unit of a program included in the segment.   The method according to claim 2 or 4, wherein the multimedia presentation description is updated by at least one of a unit of the segment and a unit of a program included in the segment.   The server apparatus according to claim 3 or 6, wherein the multimedia presentation description is updated in at least one of a unit of the segment and a unit of a program included in the segment.   The client apparatus according to claim 5 or 7, wherein the multimedia presentation description is updated in at least one of a unit of the segment and a unit of a program included in the segment.   The system of claim 1, wherein the client device requests the server to transmit the updated multimedia presentation description when the multimedia presentation description is updated.   5. The method according to claim 2, wherein the client device requests the server to transmit the updated multimedia presentation description when the multimedia presentation description is updated. .   The server according to claim 3 or 6, wherein the client device requests the server to transmit the updated multimedia presentation description when the multimedia presentation description is updated. apparatus.   8. The client according to claim 5, wherein the client device requests the server to transmit the updated multimedia presentation description when the multimedia presentation description is updated. apparatus.

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