KR101999728B1 - Method for transmitting broadcast stream, re-transmitting server and media reproducing device - Google Patents

Abstract

A method of reproducing a broadcast signal in a media playback apparatus includes receiving a broadcast stream including a time information-containing packet and a time-information-not-included packet through a first network that does not use the internet protocol, outputting a broadcast stream, Comprising the steps of: detecting a missing period of a packet based on time information of a time information containing packet; requesting, by a retransmission server, data on a missing interval through a second network using the Internet protocol; Via a second network.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for transmitting a broadcast stream, a retransmission server,

The present invention relates to a method for transmitting a broadcast stream, a retransmission server, and a media playback apparatus.

The satellite broadcasting service is a service for receiving a broadcast signal transmitted from the ground from a satellite in a geostationary orbit of the universe and retransmitting it to a satellite broadcast antenna on the ground. A dedicated frequency is allocated to each satellite for communication with a ground station or a satellite broadcast antenna. Typically, a C band (4 / 6GHz), a Ku band (12 / 14GHz), and a Ka band (20 / 30GHz) are used. The satellite broadcast antenna includes a low noise block-converter (LNB) for receiving a high frequency signal transmitted from a satellite and converting it into an intermediate frequency (IF) domain. A satellite broadcast signal received by a satellite broadcast antenna and converted into an IF signal is applied to a set-top box (STB) and is provided to a subscriber as a broadcast service.

Recently, satellite broadcasting service is provided in the vehicle. In the case of a satellite broadcasting service provided to a vehicle, a problem occurs that a moving speed of a vehicle equipped with a set-top box is increased, a packet of a satellite broadcasting signal is dropped due to interference of radio waves or entering a shadow area, .

The conventional satellite broadcasting system detects the omission of a packet by checking the continuity of a continuity counter (CC) included in a packet of a broadcast stream, and provides a service in such a manner that a broadcast stream is retransmitted from a missing packet . Here, the continuity counter is set to 4 bits. In case of a packet having the same PID, the continuity counter is incremented by 1 for each PID. When the value of the continuous counter exceeds 15 (the maximum value of 4 bits), it is initialized to 0 again.

The packet missing detection method using the conventional continuity counter is a method of determining that a packet is missing when a continuity value to be circulated for each PID of a TS packet is received as a value that is not circulated. Such a packet missing detection method can confirm whether or not a value of a continuity counter having a range of 0 to 15 is missing on a satellite broadcasting service transmitting several hundred to several thousand packets per second, .

On the other hand, Korean Unexamined Patent Publication No. 2015-0075132 discloses a configuration in which, when a lost or damaged packet is detected in a set-top box, a lost packet is transmitted to the set-top box based on the sequence number of the lost packet.

A media playback apparatus detects a missing section of a packet based on time information of a time information containing packet included in a broadcast stream and requests data on a missing section to a retransmission server through a network using an Internet protocol , And receives data on the missing interval from the retransmission server through the network. It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to a first aspect of the present invention, there is provided a broadcast playback method in a media playback apparatus that includes a time information-containing packet and a time information-not-included packet The method comprising: receiving a broadcast stream including a broadcast stream; Outputting the broadcast stream; Detecting a missing interval of a packet based on time information of the time information containing packet in the broadcast stream; Requesting a retransmission server for data on the missing interval through a second network using an Internet protocol; And receiving data on the missing interval from the retransmission server through the second network.

A retransmission server according to a second aspect of the present invention includes: a broadcast stream receiving unit for receiving a broadcast stream including a time information containing packet and a time information not containing packet; A packet storage unit for storing each packet of the broadcast stream; A request receiver for receiving data on a missing interval through a network based on an Internet protocol from a media player; And a missing interval data transmitting unit for transmitting data on the missing interval to the media playback apparatus via a network based on the Internet protocol, and the missing interval can be detected based on time information of the time information containing packet.

A media playback apparatus according to a third aspect of the present invention includes: a broadcast stream receiver for receiving a broadcast stream including a time information-containing packet and a time information-less packet through a first network that does not use an Internet protocol; An output unit outputting the broadcast stream; A missing section detecting section for detecting a missing section of the packet based on time information of the time information containing packet in the broadcast stream; A missing section data requesting unit for requesting data for the missing section to a retransmission server through a second network using an Internet protocol; And a missing interval data receiver for receiving data on the missing interval from the retransmission server through the second network.

The above-described task solution is merely exemplary and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and the detailed description of the invention.

According to any one of the above-mentioned objects of the present invention, a media playback apparatus detects a missing period of a packet based on time information of a packet containing time information in a broadcast stream, It is possible to request data on the missing interval to the retransmission server and receive data on the missing interval from the retransmission server through the network. Accordingly, a missing section that is not received by the media playback apparatus can be supplemented with data on a missing section received from the retransmission server, thereby normally reproducing the broadcast stream.

1 is a configuration diagram of a broadcast stream transmission system according to an embodiment of the present invention.
2 is a block diagram of the media playback apparatus shown in FIG. 1 according to an embodiment of the present invention.
3A to 3D are diagrams illustrating a structure of a packet and a method of detecting a missing packet according to an embodiment of the present invention.
4 is a flowchart illustrating a method of transmitting a broadcast in a media player according to an embodiment of the present invention.
5 is a flow diagram illustrating a method for re-receiving a missing packet in a broadcast stream, in accordance with an embodiment of the present invention.
6 is a flowchart illustrating a method for re-receiving a missing packet in a broadcast stream according to another embodiment of the present invention.
Figure 7 is a block diagram of the retransmission server shown in Figure 1, in accordance with an embodiment of the present invention.
8 is a flowchart illustrating a method of retransmitting a missing packet in a retransmission server according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

In this specification, the term " part " includes a unit realized by hardware, a unit realized by software, and a unit realized by using both. Further, one unit may be implemented using two or more hardware, or two or more units may be implemented by one hardware.

In this specification, some of the operations or functions described as being performed by the terminal or the device may be performed in the server connected to the terminal or the device instead. Similarly, some of the operations or functions described as being performed by the server may also be performed on a terminal or device connected to the server.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

1 is a configuration diagram of a broadcast stream transmission system according to an embodiment of the present invention.

Referring to FIG. 1, a broadcast stream transmission system may include a media playback apparatus 100 and a retransmission server 110. However, since the broadcasting stream transmission system of FIG. 1 is only an embodiment of the present invention, the present invention is not limited to FIG. 1 and may be configured differently from FIG. 1 according to various embodiments of the present invention .

Generally, each component of the broadcast stream transmission system of FIG. 1 is connected through a network. The network refers to a connection structure in which information can be exchanged between each node such as terminals and servers. The network includes a satellite communication network, a local area network (LAN), a wide area network (WAN) WWW: World Wide Web), wired / wireless data communication network, telephone network, wired / wireless television communication network, and the like. Examples of wireless data communication networks include 3G, 4G, 5G, 3GPP, LTE, WIMAX, Wi-Fi, Bluetooth, infrared, Communications, Visible Light Communication (VLC), LiFi, and the like.

The satellite 110 may receive a broadcast stream from a broadcast service server (not shown) and transmit the broadcast stream to the retransmission server 110 and the media playback apparatus 100 through a first network (satellite communication network).

The media playback apparatus 100 may receive the broadcast stream requested by the user from the satellite 110 through the first network and output the broadcast stream through the display device 20 installed in the vehicle 10. [

The media playback apparatus 100 can detect a section of a missing packet in a broadcast stream when the vehicle 10 in which the media playback apparatus 100 is installed enters the transliteration region. For example, the media playback apparatus 100 detects a missing period of a packet based on time information in a time information containing packet of a broadcast stream, and detects a missing period of a packet based on a second network (Internet protocol based communication network, e.g., 3G communication, LTE communication, The retransmission server 110 may request the data of the missing interval through the retransmission server 110. [

Here, the broadcast stream includes a time information containing packet and a time information not containing packet. The time information of the time information containing packet includes a program clock reference (PCR), a presentation time stamp (PTS) And a Decoding Time Stamp (DTS).

The media playback apparatus 100 may request the retransmission server 110 for data on the missing interval through the second network.

The retransmission server 110 may receive and store broadcast streams from the satellites 110 over the first network. In contrast, retransmission server 110 may also receive and store broadcast streams from other servers (e.g., Framers) that have received broadcast streams from satellites 110. The retransmission server 110 may be a retransmission server (RET server) that transmits only data for a missing interval in response to a data transmission request for a missing interval from the media playback apparatus 100. [

When the vehicle 10 in which the media playback apparatus 100 is installed enters the transliteration region, the retransmission server 110 transmits the data corresponding to the missing packet segment of the broadcast content received by the media playback apparatus 100 to the second It can be provided to the media playback apparatus 100 through a network (mobile communication network, e.g., IP network, LTE network, etc.).

Hereinafter, the operation of each component of the broadcast stream transmission system of FIG. 1 will be described in more detail.

2 is a block diagram of the media playback apparatus 100 shown in FIG. 1, according to an embodiment of the present invention.

2, the media playback apparatus 100 includes a broadcast stream receiving unit 200, an output unit 210, a missing interval detecting unit 220, a missing interval data requesting unit 230, and a missing interval data receiving unit 240 . Here, the missing section detecting section 220 may include a continuity counter identifying section 222 and a time information identifying section 224. However, the media playback apparatus 100 shown in FIG. 2 is only one embodiment of the present invention, and various modifications are possible based on the components shown in FIG.

Hereinafter, description will be made with reference to FIG. 2 and FIGS. 3A to 3D.

The broadcast stream receiving unit 200 can receive a broadcast stream from the satellite 120 through a first network that does not use the internet protocol. Here, the first network may be, for example, a satellite communication. At this time, the broadcast stream received from the satellite 120 includes a time information including packet and a time information not containing packet, and may be stored in a media buffer unit (not shown) for a predetermined time.

The broadcast stream receiving unit 200 extracts a time information containing packet from among a plurality of packets of the broadcast stream, and stores the key value of the extracted time information containing packet and the storage location of the time information containing packet in a sequential order, Time).

The output unit 210 may output the broadcast stream through the display device 20. [

The missing section detecting section 220 can detect a missing section of the packet based on the time information of the packet including the time information in the broadcast stream. The structure of each packet of the broadcast stream for a while will be described with reference to FIGS. 3A to 3B.

Referring to FIG. 3A, each packet of a broadcast stream includes a TS header 302 and a payload 304 in the form of a packet of a TS (Transport Stream).

The TS header 302 may include a Packet Identifier (PID) field 306, a Continuity Counter (CC) field 308, and an adaptation field 310. Here, the continuity counter has a continuous value for each PID of each packet unless discontinuity is indicated through a discontinuity indicator 312 of the adaptation field 310. It is possible to detect a lost TS packet.

The broadcast stream may include a time information containing packet and a time information not containing packet.

Here, the time information included in the time information containing packet includes at least one of a program clock reference (PCR), a presentation time stamp (PTS), and a decoding time stamp (DTS) can do. For example, in the case of a time information containing packet (a packet including at least one time information), a program clock reference (PCR) 314 may be included in the adaptation field 310 of the TS header 302.

A program clock reference (PCR) is a value obtained by sampling the time of the encoder system at a system clock of 27 MHz. A presentation time stamp (PTS) represents a time at which audio or video is actually reproduced. A decoding time stamp The time stamp of the program clock reference, the presentation time stamp, and the decoding time stamp represent unique values that do not overlap in the data transmitted within each channel.

Referring to FIG. 3B, all of the packets (including the time information packet and the time information information packet) of the broadcast stream include a continuity counter value, while at least one time information includes a program clock reference (PCR), a presentation time stamp ) And a decoding time stamp (DTS) are included in a packet (packet containing time information) every predetermined frequency period among a plurality of packets of the broadcast stream. Here, the continuity counter is set to a 4-bit value, and values of 0 to 15 are set for each PID of the TS packet to be circulated.

For example, in the case of a clock reference (PCR), it has a 42 bit value and is counted in 27 MHz cycles. In Europe, the clock reference (PCR) must be included in the packet at least once within 40ms. In the United States, a clock reference (PCR) must be included in the packet at least once within 100 ms. In the case of a presentation time stamp (PTS) and a decoding time stamp (DTS), it is counted in a cycle of 90 MHz, and a presentation time stamp (PTS) or a decoding time stamp (DTS) That is, a clock reference (PCR) must be included in the packet at least once within 33ms to 34ms for 30 frames per second.

The continuity counter checking unit 222 can check the continuity of the continuity counter values of the time information-containing packet and the time information-not-included packet to determine whether or not the packet is missing.

The continuity counter checking unit 222 may check the continuity of the currently received packet by using the previous continuity counter value according to the cyclic repetition characteristic of the continuity counter. Thus, it is possible to determine whether or not the currently erroneous packet is a packet to be originally received.

The time information confirmation unit 224 can calculate the difference between the counter value of one continuous time information containing packet and the next time information containing packet.

The time information confirmation unit 224 can determine whether a packet is missing through the difference in the counter value between consecutive time information containing packets. For example, when a difference of a counter value of 100 ms or more occurs between time information containing packets containing a program clock reference among consecutive time information containing packets or a difference of 700 ms or more between the time information containing packets containing presentation time stamps It can be confirmed that there is a missing packet in the broadcast stream.

A method for detecting a missing packet among the received broadcast streams will be described with reference to FIGS. 3C and 3D for a while.

3C shows each packet of the broadcast stream. For example, the media playback apparatus 100 receives a packet in the order of a packet 320, a packet 318, and so on.

3C, if the continuity counter of one packet 318 is not consecutive with the next packet 316, the missing interval detection unit 220 identifies the corresponding one of the packets 318 as a missing packet 318 , And can identify the next packet 316 as a packet 316 immediately after the missing. In this case, since the value of the continuity counter of each packet is sequentially circulated from 0 to 15, the missing interval detecting unit 220 can detect the missing interval of the packet based on the normal circulation of the continuity counter value.

For example, if it is assumed that a packet having a continuity counter value of '4' is received after the packet having the continuity counter value of '1' is received by the media playback apparatus 100, The packet having the continuity counter value of '2' and the packet having the continuity counter value of '3'.

The missing section detection unit 220 detects a missing packet as a subsequent packet of the packet 316 immediately after the missing from the first time information containing packet 320 closest to the immediately preceding packet 318 as a previous packet of the immediately preceding packet 318 316 and the second time information containing packet 322 closest to the second time information containing packet 322 can be detected as the missing section 324.

Referring to FIG. 3D, the missing interval detection unit 220 may determine a difference in a counter value between one continuous time information containing packet 326 and a next time information containing packet 328.

If the difference between the counter value of one time information containing packet 326 and the next time information containing packet 328 is equal to or greater than a predetermined value, the missing interval detecting section 220 detects the next time information from one time information containing packet 326 Up to the inclusion packet 328 may be determined as the missing section 330. [ For example, it is assumed that the difference between the counter values of the PCRs between the time information-containing packets including the program clock reference is '1000' (predetermined value), and the time when the PCR value is '2000' If the time information containing packet having the PCR value of '4000' is received after receiving the information containing packet, the missing section detecting unit 220 can confirm that the time information containing packet having the PCR value of '3000' is missing.

Referring to FIG. 3C, the missing interval data requesting unit 230 may request the retransmission server 110 for data on the missing interval through the second network using the Internet protocol. Referring to FIG. 3C, the missing interval data request unit 230 includes a Transport Stream Packet Identifier (TS ID), a Service ID (Service Identifier), a PID (Packet Identifier), a first time information The retransmission of the data for the missing section 324 is transmitted to the retransmission server 110 by transmitting the key value of the inclusion packet 320 and the key value of the second time information containing packet 322 closest to the packet 316 immediately after the missing packet to the retransmission server 110 Lt; RTI ID = 0.0 > 110 < / RTI >

For example, after the missing packet 318 is identified, the missing interval data requesting unit 230 firstly transmits a TS ID (Transport Stream Packet Identifier), a Service ID (Service Identifier), a PID (Packet Identifier) By transmitting the key value of the included packet 320 to the retransmission server 110, the first time information containing packet 320 and subsequent packets may be received.

The missing interval data requesting unit 230 transmits the key value of the second time information containing packet 322 to the retransmission server 110 so that the data on the missing interval 326 It is possible to stop the transmission of the data.

At this time, the data for the missing section 324 may include all video packets and audio packets included in the missing section 324. [ Here, the TS ID, the Service ID, the PID, and the time information containing packet represent unique values that do not overlap each other in the satellite broadcasts transmitting the plurality of broadcast channels.

Referring to FIG. 3D, the missing interval data requesting unit 230 transmits the TS ID, the service ID, the PID, the key value of one time information containing packet 326 and the key value of the next time information containing packet 328 to the retransmission server 110 ) To request the retransmission server 110 to retransmit the data for the missing section 330. [

For example, the missing interval data requesting unit 230 first transmits the key value of the TS ID, the Service ID, the PID, and the missing time information containing packet 326 to the retransmission server 110, thereby receiving the missing-time-before-time-information containing packet 326 and packets thereafter.

The missing interval data requesting unit 230 transmits the key value of the time information containing packet 328 to the retransmission server 110 immediately after the missing time information packet 328, It is possible to stop the retransmission of the data to the base station.

In this case, the data on the missing section 330 may include all video packets and audio packets included in the missing section 330. [

The missing interval data receiving unit 240 can receive data on the missing interval from the retransmission server 110 through a second network (e.g., Long Term Evolution).

The output unit 210 may sequentially output packets included in the missing interval from the output time corresponding to the missing interval through the display device 20 based on the data on the received missing interval.

Those skilled in the art will appreciate that the broadcast stream receiving unit 200, the output unit 210, the missing section detecting unit 220, the continuity counter identifying unit 222, the time information checking unit 224, the missing interval data requesting unit 230, And the missing interval data receiving unit 240 may be separately implemented, or at least one of them may be integrated.

4 is a flowchart illustrating a broadcast transmission method in the media playback apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 4, in step S401, the media playback apparatus 100 may receive a broadcast stream including a time information inclusion packet and a time information inclusion packet through a first network that does not use the Internet protocol. Here, the first network may be, for example, a satellite communication network.

In step S403, the media playback apparatus 100 can output the broadcast stream through the display device 20 installed in the vehicle.

In step S405, the media playback apparatus 100 can detect a missing section of the packet based on the time information of the time information-containing packet in the broadcast stream. Here, the time information may include at least one of a program clock reference (PCR), a presentation time stamp (PTS), and a decoding time stamp (DTS).

In step S407, the media playback apparatus 100 may request the retransmission server 110 for data on the missing interval through the second network using the Internet protocol. Here, the second network may be, for example, a Long Term Evolution communication network.

In step S409, the media playback apparatus 100 can receive data on the missing interval from the retransmission server 110 via the second network.

In the above description, steps S401 to S409 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. Also, some of the steps may be omitted as necessary, and the order between the steps may be changed.

5 is a flow diagram illustrating a method for re-receiving a missing packet in a broadcast stream, in accordance with an embodiment of the present invention.

The missing packet re-reception method according to the embodiment shown in FIG. 5 includes the steps of time-series processing in the media playback apparatus 100 and the retransmission server 110 according to the embodiment shown in FIG. 1 to FIG. Therefore, even if omitted below, the contents described with respect to the media playback apparatus 100 and the retransmission server 110 of FIGS. 1 to 4 can be applied to the missing packet re-reception method according to the embodiment shown in FIG. 5 .

Referring to FIG. 5, in step S501, the media playback apparatus 100 may receive a broadcast stream including a time information-containing packet and a time information-not-included packet from the satellite 120 via a first network that does not use the Internet protocol have. Here, each of the time information containing packet and the time information not containing packet has a continuity counter value.

In step S503, the media playback apparatus 100 may determine the continuity of the continuity counter values of the time information-inclusive packet and the non-time information-inclusive packet in the broadcast stream.

If it is determined in step S505 that the continuity counter value of one packet is not contiguous with the continuity counter value of the next packet, the media playback apparatus 100 identifies one packet as a miss immediately preceding packet in step S507, It can be identified as a packet immediately after it.

In step S509, the media playback apparatus 100 omits from the first time information containing packet, which is the previous packet of the immediately preceding packet, to the second time information containing packet that is close to the missing packet immediately after the omission, Can be detected.

In step S511, the media playback apparatus 100 may transmit the TS ID, the service ID, the PID, the key value of the first time information containing packet, and the key value of the second time information containing packet to the retransmission server 110. [

In step S513, the media playback apparatus 100 may receive data on a missing section of the broadcast stream from the retransmission server 110 via the second network. Here, the second network may be a network based on Internet protocols.

In the above description, steps S501 through S513 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. Also, some of the steps may be omitted as necessary, and the order between the steps may be changed.

6 is a flowchart illustrating a method for re-receiving a missing packet in a broadcast stream according to another embodiment of the present invention.

The missing packet re-reception method according to the embodiment shown in FIG. 6 includes the steps of the media playback apparatus 100 and the retransmission server 110 according to the embodiment shown in FIG. 1 to FIG. Therefore, the content described with respect to the media playback apparatus 100 and the retransmission server 110 of FIGS. 1 to 5 can be applied to the missing packet re-reception method according to the embodiment shown in FIG. 6 .

Referring to FIG. 6, in step S601, the media playback apparatus 100 may receive a broadcast stream including a time information-containing packet and a time information-less packet from the satellite 120 via a first network that does not use the Internet protocol have. Here, each of the time information containing packet and the time information not containing packet has a continuity counter value.

In step S603, the media playback apparatus 100 can determine the continuity of the continuity counter values of the time information-containing packet and the time information-not-included packet in the broadcast stream.

In step S605, if it is determined that the continuity counter value of one packet is continuous with the continuity counter value of the next packet, the media playback apparatus 100 determines in step S607 whether there is a time difference between the one time information- The difference in the counter value can be calculated. If discontinuous packets are detected between the continuity counter values of each packet in step S605, steps after step S507 in FIG. 5 may be performed.

In step S609, if the calculated counter value is equal to or larger than the predetermined value, the media playback apparatus 100 may determine a period from one time information containing packet to the next time information containing packet as a missing interval.

In step S611, the media playback apparatus 100 may transmit the TS ID, the Service ID, the PID, the key value of one time information containing packet, and the key value of the next time information containing packet to the retransmission server 110.

In step S613, the media playback apparatus 100 may receive data on a missing interval of the broadcast stream from the retransmission server 110 through the second network. Here, the second network may be a network based on Internet protocols.

In the above description, steps S601 to S613 may be further divided into further steps or combined into fewer steps, according to an embodiment of the present invention. Also, some of the steps may be omitted as necessary, and the order between the steps may be changed.

FIG. 7 is a block diagram of the retransmission server 110 shown in FIG. 1, in accordance with an embodiment of the present invention.

Referring to FIG. 7, the retransmission server 110 may include a broadcast stream receiving unit 700, a packet storing unit 710, a request receiving unit 720, and a missing interval data transmitting unit 730. However, the retransmission server 110 shown in FIG. 7 is only one embodiment of the present invention, and various modifications are possible based on the components shown in FIG.

The broadcast stream receiving unit 700 can receive the same broadcast stream received from the satellite 120 or the broadcast service server (not shown) by the media playback apparatus 100. [ Here, the broadcast stream may be a stream including a time information including packet and a time information not containing packet.

The packet storage unit 710 may store each packet of the broadcast stream for each PID in a media buffer unit (not shown).

The packet storage unit 710 may store the key value of the time information-containing packet and the storage location of the time information-containing packet in the time information-containing packet buffer unit (not shown) in a sequential order when receiving the time information- . Alternatively, the packet storage unit 710 may store the key value of each packet in the media buffer unit (not shown) by matching with the continuity counter value for each PID.

Each packet of the time information and the packet not including the time information of the broadcast stream has a continuity counter value. Here, the time information-containing packet appears every predetermined frequency period, and may include at least one of a program clock reference (PCR), a presentation time stamp (PTS), and a decoding time stamp (DTS).

The request receiving unit 720 may receive data on the missing interval through the network based on the Internet protocol from the media playback apparatus 100. [ Here, the network based on the Internet protocol may be, for example, a Long Term Evolution (WTM) communication network.

The request receiving unit 720 may receive the TS ID, the service ID, the PID, the key value of the first time information containing packet, and the key value of the second time information containing packet from the media playback apparatus 100. For example, when a packet in which the continuity counter value is not consecutive is detected in the packets of the broadcast stream received from the media playback apparatus 100, or when a packet of at least one time information of the adjacent time information containing packet A service ID, a PID, a key value of the first time information containing packet, and a key value of the second time information containing packet from the media playback apparatus 100 when the missing packet is detected based on the difference have.

Here, the first time information containing packet in the case where a packet in which the continuity counter is not consecutive is detected corresponds to a time information containing packet which is a previous packet of the immediately preceding packet immediately before the discontinuity of the continuity counter starts, , The second time information containing packet may correspond to a time information containing packet that is close to the packet immediately after the missing, as a subsequent packet of the packet immediately after the discontinuity of the continuity counter ends.

The first time information containing packet in the case where the missing packet is detected based on the difference of the counter value of at least one time information of the adjacent time information containing packet includes the time information close to the missing packet as the packet before the missing packet And the second time information containing packet corresponds to the time information containing packet close to the normal packet after the missing packet.

The missing section data extracting unit (not shown) extracts a key value of the first time information including packet and a key value of the second time information containing packet in a time information packet buffer unit (not shown) ) From the first time information containing packet to the second time information containing packet.

The missing interval data transmitting unit 730 can transmit the data of the missing interval to the media reproducing apparatus 100 through the network based on the Internet protocol. For example, the missing interval data transmitting unit 730 may transmit a plurality of missing packets from the first time information containing packet to the second time information containing packet based on the key value of the first time information containing packet and the key value of the second time information containing packet. It is possible to transmit the packet to the media playback apparatus 100 as the missing section data.

Those skilled in the art will appreciate that the broadcast stream receiving unit 700, the packet storing unit 710, the request receiving unit 720, and the missing interval data transmitting unit 730 may be implemented separately

8 is a flowchart illustrating a method of retransmitting a missing packet in the retransmission server 110 according to an embodiment of the present invention.

Referring to FIG. 8, in step S801, the retransmission server 110 may receive a broadcast stream including a time information-containing packet and a time information-not-included packet. For example, the retransmission server 110 can receive the same broadcast stream received from the satellite 120 or the media playback apparatus 100 from a broadcast service server (not shown).

In step S803, the retransmission server 110 may store each packet of the broadcast stream. Here, each packet of the broadcast stream has a continuity counter value.

In step S805, the retransmission server 110 may receive data on the missing interval through the network based on the Internet protocol from the media playback apparatus 100. [ Here, a network based on the Internet protocol may include, for example, a long-term evolution network.

In step S807, the retransmission server 110 may transmit the data on the missing interval to the media playback apparatus 100 via the network based on the Internet protocol.

In the above description, steps S801 to S807 may be further divided into further steps or combined into fewer steps, according to an embodiment of the present invention. Also, some of the steps may be omitted as necessary, and the order between the steps may be changed.

One embodiment of the present invention may also be embodied in the form of a recording medium including instructions executable by a computer, such as program modules, being executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer readable medium may include both computer storage media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

100: Media player
110: Retransmission server
200: broadcast stream receiver
210:
220: missing section detector
222: continuity counter check unit
224: time information confirmation unit
230: Missing interval data request unit
240: Missing interval data receiver
700: broadcast stream receiver
710: Packet storage unit
720:
730: Missing interval data transmission unit

Claims (19)

A broadcast reproducing method performed in a media reproducing apparatus,
Receiving a broadcast stream including a time information inclusion packet and a time information incomplete packet through a first network that does not use an internet protocol;
Outputting the broadcast stream;
Detecting a missing interval of a packet based on time information of the time information containing packet in the broadcast stream;
Requesting a retransmission server for data on the missing interval through a second network using an Internet protocol; And
Receiving data on the missing interval from the retransmission server through the second network
, ≪ / RTI &
Wherein each of the time information containing packet and the time information not containing packet has a Continuity Counter (CC)
The step of detecting the missing interval
Determining continuity of a continuity counter value of each of the time information-containing packet and the non-time information packet;
Identifying the one packet as a missing packet and identifying the next packet as a missing packet if the continuity counter value of one packet is not contiguous with the continuity counter value of the next packet; And
Detecting as a missing section from a first time information containing packet close to the immediately preceding packet as a previous packet of the missing packet to a second time information containing packet subsequent to the missing packet as a subsequent packet subsequent to the missing packet;
And reproducing the broadcast program.
The method according to claim 1,
Wherein the first network is a satellite communication network.
The method according to claim 1,
Wherein the second network is a Long Term Evolution communication network.
The method according to claim 1,
Wherein the time information includes at least one of a Program Clock Reference (PCR), a Presentation Time Stamp (PTS), and a Decoding Time Stamp (DTS).
delete delete The method according to claim 1,
The step of requesting data to the retransmission server for the missing interval
Transmitting a Transport Stream Packet Identifier (TS ID), a Service ID (Service Identifier), a PID (Packet Identifier), and a key value of the first time information containing packet to the retransmission server; And
Transmitting the key value of the second time information containing packet to the retransmission server
And reproducing the broadcast program.
A broadcast reproducing method performed in a media reproducing apparatus,
Receiving a broadcast stream including a time information inclusion packet and a time information incomplete packet through a first network that does not use an internet protocol;
Outputting the broadcast stream;
Detecting a missing interval of a packet based on time information of the time information containing packet in the broadcast stream;
Requesting a retransmission server for data on the missing interval through a second network using an Internet protocol; And
Receiving data on the missing interval from the retransmission server through the second network
, ≪ / RTI &
The step of detecting the missing interval
Calculating a difference in a counter value between one time information containing packet and a next time information containing packet in the broadcast stream; And
If the calculated counter value is equal to or greater than a preset value, determining from the one time information containing packet to the next time information containing packet to be a missing interval
And reproducing the broadcast program.
9. The method of claim 8,
The step of requesting data to the retransmission server for the missing interval
Transmitting a Transport Stream Packet Identifier (TS ID), a Service ID (Service Identifier), a PID (Packet Identifier), and a key value of the one time information containing packet to the retransmission server; And
Transmitting the key value of the next time information containing packet to the retransmission server
And reproducing the broadcast program.
In a retransmission server,
A broadcast stream receiver for receiving a broadcast stream including a time information containing packet and a time information not containing packet;
A packet storage unit for storing each packet of the broadcast stream;
A request receiver for receiving data on a missing interval through a network based on an Internet protocol from a media player;
A missing section data transmitting section for transmitting data on the missing section to the media reproducing apparatus through a network based on the internet protocol,
Lt; / RTI >
Wherein the missing interval is detected based on time information of the time information containing packet,
The request receiver receives a Transport Stream Packet Identifier (TS ID), a Service ID (Service Identifier), a PID (Packet Identifier), a key value of the first time information containing packet, and a key value of the second time information containing packet from the media playback apparatus and,
Wherein the first time information containing packet and the second time information containing packet are based on a continuity of a value of a continuity counter (CC) of each packet or a difference of a counter value of the time information of the adjacent time information containing packet ≪ / RTI >
11. The method of claim 10,
Wherein the packet storage unit stores a key value of the time information containing packet and a storage location of the time information containing packet.
delete 11. The method of claim 10,
The missing interval data transmission unit may transmit a plurality of packets from the first time information containing packet to the second time information containing packet based on the key value of the first time information containing packet and the key value of the second time information containing packet, And transmits the data as missing interval data.
In the media playback apparatus,
A broadcast stream receiving unit for receiving a broadcast stream including a time information containing packet and a time information not containing packet through a first network that does not use the internet protocol;
An output unit outputting the broadcast stream;
A missing section detecting section for detecting a missing section of the packet based on time information of the time information containing packet in the broadcast stream;
A missing section data requesting unit for requesting data for the missing section to a retransmission server through a second network using an Internet protocol; And
A missing interval data receiver for receiving data on the missing interval from the retransmission server through the second network;
Lt; / RTI >
Wherein each of the time information containing packet and the time information not containing packet has a value of a continuity counter (CC)
Wherein the missing interval detection unit comprises: a continuity counter check unit for determining continuity of a continuity counter (CC) of each of the time information-containing packet and the time information-less packet; And
A time information confirmation unit for calculating a difference between the counter value of one time information containing packet and the next time information containing packet,
Lt; / RTI >
Wherein the missing section detecting unit identifies the one packet as a missing packet and identifies the next packet as a missing packet if the continuity counter of one packet is not consecutive with the next packet,
Wherein the missing section detecting section detects, from the first time information containing packet closest to the immediately preceding packet as the previous packet of the immediately preceding missing packet, a second time information containing packet closest to the missing packet immediately after the missing packet And detects the missing section as the missing section.
delete delete delete In the media playback apparatus,
A broadcast stream receiving unit for receiving a broadcast stream including a time information containing packet and a time information not containing packet through a first network that does not use the internet protocol;
An output unit outputting the broadcast stream;
A missing section detecting section for detecting a missing section of the packet based on time information of the time information containing packet in the broadcast stream;
A missing section data requesting unit for requesting data for the missing section to a retransmission server through a second network using an Internet protocol; And
A missing interval data receiver for receiving data on the missing interval from the retransmission server through the second network;
Lt; / RTI >
Wherein each of the time information containing packet and the time information not containing packet has a value of a continuity counter (CC)
Wherein the missing interval detection unit comprises: a continuity counter check unit for determining continuity of a continuity counter (CC) of each of the time information-containing packet and the time information-less packet; And
A time information confirmation unit for calculating a difference between the counter value of one time information containing packet and the next time information containing packet,
Lt; / RTI >
Wherein the missing interval detecting unit determines the missing interval from the one time information containing packet to the next time information containing packet when the calculated counter value is equal to or larger than a predetermined value.
19. The method of claim 18,
The missing interval data requesting unit transmits the transport stream packet identifier (TSID), the service ID (Service Identifier), the PID (Packet Identifier), the key value of the one time information containing packet and the key value of the next time information- To the server.

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