KR20110069670A - Headend apparatus for transmitting video broadcasting content using channel bonding, and broadcasting reciever and method for recieving video broadcasting content - Google Patents

Abstract

PURPOSE: A head-end device transmitting video broadcasting contents using channel combination and a broadcasting receiver receiving the video broadcasting contents, and a method thereof are provided to transmit service transmission information including channel combination information to the broadcasting receiver. CONSTITUTION: A receiving unit(110) receives video broadcasting contents corresponding to a selected broadcasting channel. A plurality of modulators(130) modulates the video broadcasting contents. According to the resolution of the video broadcasting contents, a controller(120) decides the combination of a plurality of transmission channels. If the channel combination is determined, the controller combines the transmission channel. The controller transmits the video broadcasting contents to a broadcasting receiver(200) with the control of the modulator.

Description

Headend device for transmitting video broadcast content using channel combining and broadcast receiving device for receiving video broadcast content, and method thereof

The present invention relates to a headend device for transmitting video broadcast content using channel combining, and a broadcast receiving device for receiving video broadcast content and a method thereof, and more particularly, to ultra-high resolution (UHD: Ultra) using channel combining. The present invention relates to a headend device and a broadcast receiving device for transmitting high definition video broadcast content to a subscriber, and a method for transmitting and receiving video broadcast content.

In a cable network, video broadcasting content is allocated one transmission channel (frequency channel) per one video broadcasting content, and one video broadcasting content is transmitted to a broadcast receiving device of a subscriber through the allocated transmission channel. In detail, one video broadcast content is transmitted in the form of MPEG-2 TS packet stream, and is modulated into a transmission channel through QAM (Quadrature Amplitude Modulation (QAM)) transmission equipment of a cable network at a head end, thereby receiving a subscriber's broadcast receiving device. Is sent to.

On the other hand, the standard organization for digital broadcasting cable has proposed 256 QAM single carrier as the HFC downlink transmission standard, but since 2009, 1024/4096 QAM has been developed and proposed for improving transmission efficiency and transmitting large data.

As a technology development to provide high quality video broadcasting contents, high-definition TV (hereinafter referred to as 'HDTV') broadcasting service is currently provided, but according to the demand of viewers for ultra high quality, Ultra High Definition TV (hereinafter, Broadcasting service (UHDTV) is being developed.

UHDTV broadcasting service provides ultra high definition video (4K (3840 × 2160) and 8K (7680 × 320)) broadcasting contents that are 4 to 16 times clearer than the quality of existing HDTV. Video broadcasting contents with 4K and 8K resolutions require 5Gbps and 20Gbps transfer rates without compression, and 50Mbps and 200Mbps transfer rates are required for 100x compression. In addition, when 1024 QAM is used, 4K video broadcast content may be transmitted through a single transport channel, but 8K video broadcast content may be difficult to transmit through a single transport channel. Therefore, when providing a UHDTV broadcast service, a transmission technique using a plurality of channel combinations is required to transmit 8K video broadcast content.

The present invention has been devised to solve the above-described problem, and an object of the present invention is to determine whether to combine transmission channels according to the resolution of received video broadcasting content, and to provide service transmission information including channel combining information to the subscriber side. The present invention provides a headend device and a broadcast receiving device capable of providing video broadcasting content having ultra high definition (UHD) by transmitting to a broadcast receiving device.

In addition, another object of the present invention is to provide a broadcast receiving apparatus and method for receiving a video broadcast content of ultra-high resolution by assigning a transmission channel to a QAM demodulator according to service transmission information received from a headend device. It is to.

According to an embodiment of the present disclosure, a headend apparatus includes: a receiver configured to receive video broadcast content corresponding to a selected broadcast channel, a plurality of modulators that are one-to-one mapped to the plurality of transmission channels, and modulate the video broadcast content; The combination of the plurality of transport channels is determined according to the resolution of the video broadcast content, and when the combination is determined, the combined transport channels are configured to combine the plurality of transport channels and transmit the video broadcast content to the broadcast reception device. It includes a controller for controlling the modulation unit mapped to.

According to an embodiment of the present invention, when a service transmission information including channel combining information is received through a plurality of demodulators and at least one demodulator of the plurality of demodulators, the broadcast receiving apparatus according to the channel combining information may include the plurality of demodulators. And a controller configured to assign the at least one transport channel of the transport channels to each of the at least one demodulator to receive the video broadcast content.

In accordance with an aspect of the present invention, there is provided a method of transmitting and receiving video broadcast content, the method comprising: receiving service transmission information including channel combining information of the plurality of transmission channels from a headend device through a plurality of transmission channels formed on a cable network; Receiving video broadcast content transmitted from the headend device through at least one transport channel of the plurality of transport channels according to the channel combining information; and through at least one demodulator to which the at least one transport channel is mapped. Demodulating the video broadcast content.

According to an embodiment of the present invention, the headend device may determine whether to combine the transport channels according to the resolution of the video broadcast content and transmit service transmission information including channel combining information to the broadcast reception device at the subscriber side. Thus, a plurality of transmission channels can be combined to transmit super high resolution video broadcasting content to a broadcast receiving device.

In addition, the broadcast receiving apparatus checks the service transmission information received from the headend device and receives the ultra high resolution video broadcasting contents from the plurality of transmission channels according to the service transmission information, thereby providing the subscriber with the super high resolution video broadcasting contents. It becomes possible.

1 is a diagram illustrating a broadcast system according to an exemplary embodiment of the present invention.
2 is a diagram illustrating service transmission information according to an embodiment of the present invention.
3 is a diagram illustrating a channel information table according to an embodiment of the present invention.
4 is a flowchart illustrating a video broadcast content transmission method of a headend device according to an embodiment of the present invention.
5 is a flowchart illustrating a method of receiving video broadcast content in a broadcast receiving device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terminology used herein is a term used to properly express a preferred embodiment of the present invention, which may vary depending on a user, an operator's intention, or a custom in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

1 is a diagram illustrating a broadcast system according to an exemplary embodiment of the present invention. Referring to FIG. 1, a broadcast system includes a broadcast station 10, a headend device 100, and a broadcast receiving device 200. In this case, the video broadcast content transmission and reception provided by the present invention are related to the headend device 100 and the broadcast reception device 200, and the configuration and operation of the headend device 100 and the broadcast reception device 200 are described. The explanation is centered.

The broadcast station 10 generates and provides video broadcast content. In detail, the broadcast station 10 provides the headend device 100 with video broadcast content corresponding to a plurality of broadcast channels.

When the selection signal for a predetermined broadcast channel is received from the broadcast receiving device 200, the headend device 100 transmits video broadcast content corresponding to the corresponding broadcast channel to the broadcast receiving device 200. In this case, the headend device 100 shows only one broadcast receiving device 200 for convenience of description, but may be connected to a plurality of broadcast receiving devices in an actual broadcast system.

In addition, the headend device 100 and the broadcast reception device 200 communicate through a cable network including a plurality of transmission channels, and transmit and receive various signals through the plurality of transmission channels. In this case, the cable network has a Data Over Cable Service Interface Specification (DOCSIS) 3.0 transmission standard based on a hybrid fiber coax (HFC).

The DOCSIS (Data Over Cable Service Interface Specification) 3.0 transmission standard allows a kind of 'channel bonding' in which data is transmitted by combining two or more transmission channels in order to transmit a large amount of data. Accordingly, the headend device 100 according to an embodiment of the present invention determines whether to combine the transport channels according to the resolution of the video broadcast content, and if it is determined that the transport channels are combined, by combining at least two transport channels The video broadcast content is transmitted to the broadcast receiving device 200.

Referring to FIG. 1, the headend device 100 according to the present invention includes a receiver 110, a controller 120, a modulator 130, and a storage 140.

The receiver 110 receives the video broadcast content provided from the broadcast station 10.

The modulator 130 modulates the video broadcast content and transmits the modulated video to the broadcast receiving device 200. In addition, the modulator 130 includes a plurality of quadrature amplitude modulation (QAM) modulators, and as shown in FIG. 1, may include first to fourth QAM modulators 131, 132, 133, and 134. Can be. In this case, four first to fourth QAM modulators 131, 132, 133, and 134 are illustrated, but the QAM modulator may include a larger number. In this case, the first to fourth QAM modulators 131, 132, 133, and 134 may have any one of 64QAM, 128QAM, 256QAM, and 1024QAM, and preferably have a 1024QAM modulation scheme. In addition, the first to fourth QMA modulators 131, 132, 133, and 134 preferably all have the same modulation scheme, but are not limited thereto.

The first to fourth QAM modulators 131, 132, 133, and 134 are mapped one to one with one transmission channel. Accordingly, the first to fourth QAM modulators 131, 132, 133, and 134 may transmit various data (eg, video broadcast contents) through respective transmission channels to which they are mapped.

The storage 140 stores a channel information table that manages a broadcast channel and a channel ID corresponding to a transport channel combined for transmitting video broadcast content. For example, a broadcast channel "11" and a transport channel combined for transmitting video broadcast content corresponding to the broadcast channel "11" are "first transport channel", "second transport channel", and "third transport channel". &Quot;, " fourth transport channel ", the storage unit 140 corresponds to the corresponding broadcast channel " 11 " and channel IDs (" CH 1 ", " CH2 ", " CH3 ", " CH4 ") of the combined transport channel. Is managed by recording on the channel information table.

The controller 120 controls each component of the headend device 100 in connection with video broadcast content transmission. In detail, when a selection signal for a predetermined broadcast channel is received from the broadcast receiving device 200, the controller 120 receives video broadcast content corresponding to the predetermined broadcast channel from the broadcast station 10. Then, the resolution of this video broadcasting content is checked. In this case, since the resolution of the video broadcast content is represented by the vertical scan line and the horizontal scan line of the video broadcast content, it can be confirmed in a manner of detecting the vertical scan line information and the horizontal scan line information.

When the resolution of the video broadcast content is confirmed, the controller 120 determines whether to combine the plurality of transmission channels according to the resolution of the video broadcast content. Video broadcasting content is a kind of data (including video and audio data). The larger the resolution, the greater the amount of data, and the higher the amount of data, the higher the transmission rate. As a result, as the resolution of the video broadcast content increases, the transmission speed of the video broadcast content increases. However, each of the first to fourth transmission channels 131, 132, 133, and 134 included in the cable network may support only a transmission rate of up to 50 Mbps per transmission channel even when using the 1024QAM transmission scheme. Accordingly, since 4K (3840 × 2160) high-definition video broadcasting content is required to have a transmission speed of 50 Mbps when compressed at 100 times, it can be transmitted through one transmission channel. However, 8K (7680 x 4320) ultra-high definition video broadcasting content requires a transmission speed of 200 Mbps even if compressed at 100 times, so that transmission through one transmission channel is difficult.

As described above, when the transmission rate corresponding to the resolution of the video broadcast content does not exceed the transmission rate supported by one transmission channel, the controller 120 determines uncombined transmission channels. On the other hand, when the transmission rate corresponding to the resolution of the video broadcast content exceeds the transmission rate supported by one transmission channel, the controller 120 determines the combination of the transmission channels and determines the number of combinations of the transmission channels. When it is determined whether the transport channels are combined in this way, the controller 120 generates channel combining information corresponding to the determination result of combining, and generates service transmission information including the channel combining information.

The service transmission information is information for notifying the broadcast reception device 200 of a transmission characteristic for the video broadcast content, that is, a coupling characteristic of the transmission channel. The service transmission information includes operation state information of the headend device 100 in addition to the channel combining information. The operation state information includes state information of any one of an initialization state, an activation state, a reservation state, and a channel change state. The channel combining information includes channel combining state information indicating whether a plurality of transmission channels are combined, channel combining type information indicating a number of combining, channel combining order information indicating a combining sequence of a plurality of transmission channels, and a channel indicating changing the combining sequence. Channel ID information including the combining order change information and the channel ID corresponding to the combined transmission channel.

The controller 120 transmits the service transmission information including the coupling information to the broadcast reception device 200 through a transmission channel mapped to at least one of the first to fourth QAM modulators 131, 132, 133, and 134. send.

The controller 120 transmits the service transmission information to the broadcast receiving device 200 and then transmits the video broadcast content to the broadcast receiving device 200. In this case, the controller 120 transmits the video broadcast content to the broadcast receiving device 200 according to the channel combining information. For example, when the channel combining information is in the "channel non-combining" state, the controller 120 broadcasts a video by using any one of the first to fourth QAM modulators 131, 132, 133, and 134. After the content is modulated, the video broadcast content is transmitted to the broadcast receiving device 200 through a transmission channel mapped to the corresponding QAM modulator. On the other hand, when the channel combining information is in the "combined four channels" state, the video broadcasting contents are divided into four and modulated by using the first to fourth QAM modulators 131, 132, 133, and 134, respectively. Then, the modulated video broadcast content is transmitted to the broadcast receiving device 200 through a transmission channel mapped to the first to fourth QAM modulators 131, 132, 133, and 134, respectively.

As described above, the headend device 100 transmits to the broadcast receiving device 200 through the plurality of transmission channels, thereby providing the broadcast receiving device 200 with video broadcast content having an ultra high resolution of 8K (7680 × 4320). You can do it.

Meanwhile, the broadcast reception device 200 may be a subscriber-side device, which may be a broadcast receiver such as a settop box, or may be a TV having a built-in settop box. As described above, the headend device 100 and the broadcast reception device 200 communicate through a cable network including a plurality of transmission channels.

Referring to FIG. 1, the broadcast receiving device 200 according to the embodiment of the present invention includes a demodulator 210, a controller 220, and an output unit 230.

The demodulator 210 demodulates the service transmission information and the video broadcast content received from the headend device 100. In addition, the demodulator 210 includes a plurality of quadrature amplitude modulation (QAM) demodulators and, as illustrated in FIG. 1, may include first to fourth QAM demodulators 211, 212, 213, and 214. Can be. In this case, four first to fourth QAM demodulators 211, 212, 213, and 214 are illustrated, but the demodulator 210 may include a larger number of QAM demodulators.

In addition, the first to fourth QAM demodulators 211, 212, 213, and 214 may have a demodulation scheme of any one of 64QAM, 128QAM, 256QAM, and 1024QAM, and preferably have a 1024QAM demodulation scheme. In addition, the first to fourth QAM demodulators 211, 212, 213, and 214 preferably all have the same modulation scheme, but are not limited thereto.

When the controller 220 receives service transmission information including channel combining information through at least one QAM demodulator among the first to fourth QAM demodulators 211, 212, 213, and 214, the controller 220 according to the channel combining information may be used. At least one transport channel among the fourth to fourth transport channels is allocated to each of the at least one QAM demodulator to receive video broadcast content. In this case, the service transmission information may further include operation state information of the headend device in addition to the channel combining information. In addition, the service transmission information may be written in the frame sync trailer of the video broadcast content.

In detail, when the service transmission information is received, the controller 220 checks the channel ID information included in the channel combining information to determine whether the transmission channel assigned to the at least one QAM demodulator is the main transmission channel. For example, the channel ID information lists transmission channel IDs used when video broadcast content is transmitted, and the channel ID located at the front becomes the main transmission channel. The main transport channel is a channel set in advance for transmitting video broadcast content by the headend device 100, and the sub transport channel is a transmission coupled to the main transport channel for transmitting video broadcast content by the headend device 100. Channel. That is, when the headend device 100 combines the second to fourth transport channels in addition to the first transport channel to transmit the video broadcast content, the headend device 100 sets the first transport channel as the main transport channel, and the second to fourth transport channels. The transport channel may be set as a sub transport channel. The headend device 100 generates the information about this as channel ID information and includes the information in the channel combining information.

When the transport channel assigned to the at least one QAM demodulator is the main transport channel, the controller 220 demodulates the at least one transport channel according to the operation state information or the channel combining type information included in the service transmission information. Assign to each grandfather. Specifically, when the operation state information is the initialization state or the activation state, the controller 220 may control the main transmission channel of the previous transmission period (the previous transmission period for the video broadcast content) and the current transmission period (the video broadcast content). It is determined whether the main transmission channel of the current transmission period for the same. The main transport channel for the previous transmission period may be recorded on a recording medium (not shown) of the broadcast reception device 200.

If the main transmission channel of the previous transmission period and the main transmission channel of the current transmission period are the same, the controller 220 determines that the same video broadcasting content is received through the same transmission channel in the previous transmission period and the current transmission period, Wait for reception of service transmission information in a transmission cycle.

On the other hand, if the main transmission channel of the previous transmission period and the main transmission channel of the current transmission period are different, the controller 220 determines that the video broadcasting content and the transmission channel have been changed in the current transmission period, and thus, channel combining state information and channel combining. Check the type information. The channel combining state information indicates whether a plurality of transport channels are combined, and the channel combining type information indicates the number of combining. Therefore, the controller 220 confirms whether or not the plurality of transmission channels are combined and the number of combinations, and performs an operation corresponding to the verification result. If the channel combined state information is in the "channel uncoupled" state, the controller 220 controls the QAM demodulator to which the main transport channel is assigned to receive and demodulate the video broadcast content through the main transport channel.

On the other hand, when the channel combining state information is the "channel combining" state and the channel combining type information is the "four channel combining" state, the controller 220 performs three QAM demodulators on the three sub transmission channels except for the main transmission channel. Assign to For example, when the first transmission channel allocated to the first QAM demodulator 211 is a main transmission channel, and the second to fourth transmission channels are sub transmission channels, the second to fourth transmission channels are referred to as second to fourth transmission channels. The fourth QAM demodulators 212, 213, and 214 are allocated one-to-one. In this case, the controller 220 may confirm which transport channel is allocated by checking channel ID information included in the service transmission information, and may check the combining order of the transport channels by checking the channel combining order information.

Meanwhile, when the operation state information is the initialization state or the channel change state other than the activation state, the controller 220 checks the channel combining state information and the channel combining type information and according to the channel combining state and the "number of channel combining". Carry out the following operation. According to such an operation, the first to fourth QAM demodulators 211, 212, and 213 may receive and demodulate the video broadcast content through the first to fourth transmission channels assigned thereto.

The output unit 230 may be configured in a different form according to the broadcast receiving device 200. Specifically, when the broadcast receiving device 200 is a broadcast receiver such as a set-top box, the output unit 230 may be configured as a kind of communication unit for transmitting demodulated video broadcast content to a display device such as a TV. In contrast, when the broadcast receiving device 200 is a TV, the output unit 230 may be configured as a display unit for outputting demodulated video broadcast content on a screen.

As shown in FIG. 1, the headend apparatus 100 determines whether to combine transmission channels according to the resolution of video broadcasting content, and transmits service transmission information including channel combining information to the broadcast receiving apparatus 200. . In addition, the broadcast reception device 200 may check the service transmission information and receive the video broadcast content through a plurality of transmission channels for receiving the video broadcast content. Therefore, by combining transmission channels, it is possible to use ultra high resolution video broadcasting contents such as 8K (7680 x 320) regardless of the transmission speed.

2 is a diagram illustrating service transmission information according to an embodiment of the present invention. The service transmission information shown in FIG. 2 is included in video broadcast content. Specifically, the video broadcast content is transmitted in the form of a digital transmission frame, in which the service transmission information may be written in the frame sync trailer portion. In this case, the frame sync trailer has 48 bits of data.

Such service transmission information is information generated by the headend device 100 and includes operation state information and channel combining information of the headend device 100. In addition, the channel combining information includes channel combining state information, channel combining type information, channel combining order change information, channel combining order information, and channel ID information. In this case, the operation state information and the channel combining type information may be a kind of control information.

The channel combining state information is composed of 8 bits of data and indicates whether the transmission channel is combined. In more detail, the channel combined state information may include a channel combined ("00000000") state or a channel uncoupled ("11111111") state.

The operation state information is composed of two bits of data and indicates an operation state of the headend device 100. In more detail, the operation state information may include one of an initialization state ("00"), an activation state ("01"), a reservation state ("10"), and a channel change state ("11"). In this case, the initialization state ("00") denotes a state in which the power of the headend device 100 is restarted, cable network initialization, and the like is performed. The activation state ("01") denotes a state in which video broadcast content is being transmitted. Indicates the state.

In addition, the reserved state ("10") indicates a state in which video transmission content is reserved, and the channel change state ("11") means a state in which a broadcast channel or a transmission channel for transmitting video broadcast content is changed.

On the other hand, the channel coupling type information is information indicating the number of couplings of the transport channel, and the "channel not coupled (" 00 ")" state, the "channel combined (two combined) (" 01 ") state", "channel combined ( It can be in any of three combination ("10") states "and" channel combined (four combinations) ("11") states.

In addition, the channel combining order information is information indicating the combining order of each transport channel when two or more transport channels are combined. For example, when two or more transport channels are combined, the video broadcast content is divided into data units corresponding to the number of combinations of transport channels. The divided video broadcast content is distributed to each transmission channel and transmitted to the broadcast receiving device 200. Therefore, in order for the broadcast receiving apparatus to receive video broadcast contents in order, channel combining order information is required.

The channel combining order change information is information indicating a change state of the combining order for a plurality of transmission channels. In detail, the headend device 100 may change a transmission channel while video broadcast content is being transmitted. The headend device 100 may record on the service transmission information by setting the "channel combining order change" state to "1" and the "unchanged" state to "0".

Meanwhile, the channel ID information is information indicating a channel ID of the combined transport channel and includes up to four channel IDs. In this case, each channel ID may be 7 bits of data. The channel ID information includes frequency information of the corresponding transmission channel. Accordingly, the broadcast reception device 200 receiving the service transmission information checks frequency information and allocates a transmission channel to at least one QAM demodulator among the first to fourth QAM demodulators 211, 212, 213, and 214.

In addition, in FIG. 2, the first transport channel located first in the channel ID information may be the main transport channel, and the second to fourth transport channels subsequent to the first transport channel may be sub transport channels. If the first to fourth transport channels are combined as a channel for transmitting the same video broadcast content, service transmission information for each of the first to fourth transport channels may be generated. In this case, each of the generated service transmission information may include the same channel ID information.

Meanwhile, the service transmission information illustrated in FIG. 2 merely illustrates one embodiment provided in connection with the present invention. Accordingly, the arrangement order of the operation state information and the channel combining information included in the service transmission information may be changed in some cases.

In addition, the channel combining status information, the channel combining type information, the channel combining order change information, the channel combining order information, and the channel ID information included in the channel combining information may also be changed in some cases. It can also be changed. That is, all the information included in the service transmission information is written and transmitted in the frame sync frame trailer of the video broadcast content, but the arrangement order or the actual data value may vary.

3 is a diagram illustrating a channel information table according to an embodiment of the present invention. The channel information table manages a broadcast channel and a channel ID corresponding to a transport channel combined for transmitting video broadcast content. Specifically, as shown in FIG. 3, the channel information table includes a channel "11" which is a current broadcast channel and a transmission channel "CH1" which is a transmission channel combined for transmitting video broadcast content corresponding to the channel "11". , "CH2", "CH3" and "CH4" are recorded on the same line. As described above, the headend device 100 records and manages the broadcast channel and the combined transport channel before transmitting the video broadcast content corresponding to the current broadcast channel to the broadcast receiving device 200.

In the channel information table shown in FIG. 3, only the current broadcast channel and the channel ID corresponding to the current broadcast channel are recorded. However, the previous broadcast channel and the channel ID corresponding to the previous broadcast channels may be further recorded. have.

4 is a flowchart illustrating a video broadcast content transmission method of a headend device according to an embodiment of the present invention. Referring to FIG. 4, the headend device 100 receives video broadcast content corresponding to a predetermined broadcast channel from the broadcast station 10 (step 410).

Thereafter, the headend device 100 checks the resolution of the video broadcast content (step 420). In this case, the resolution of the video broadcast content can be confirmed using the horizontal scan line information and the vertical scan line information included in the video broadcast content.

Next, the headend device 100 checks whether the transmission rate corresponding to the resolution of the video broadcasting content exceeds the transmission rate supported by one transmission channel (step 430). As a result, if it does not exceed, the headend device 100 generates service transmission information corresponding thereto and transmits it to the broadcast receiving device 200 (step 440). The headend device 100 demodulates the video broadcast content and transmits the demodulated video content to the broadcast receiving device 200 through one transmission channel (transmission channel) (step 450). For example, if the transmission rate corresponding to the resolution of the video broadcast content is 50 Mbps, and the transmission rate supported by one transmission channel is 50 Mbps, the headend device 100 does not need to combine the transmission channels, so that the headend device 100 has one transmission channel. Video broadcasting content can be transmitted only through

On the other hand, if it is determined that the transmission rate corresponding to the resolution of the video broadcasting content exceeds the transmission rate supported by one transmission channel, the headend device 100 combines the plurality of transmission channels (step 460). In this case, the number of combinations of the transmission channels may be determined within a range capable of satisfying a transmission rate corresponding to the resolution of the video broadcast content.

Thereafter, the headend device 100 generates channel combining information related to transport channel combining, and generates service transmission information including the channel combining information (step 470). In this case, the service transmission information may further include operation state information of the headend device 100 in addition to the channel combining information.

Next, the headend device 100 transmits the service transmission information to the broadcast reception device through each of the combined transmission channels (step 480). In operation 490, the video broadcast content is transmitted to the broadcast receiving device 200 through each transmission channel.

5 is a flowchart illustrating a method of receiving video broadcast content in a broadcast receiving device according to an embodiment of the present invention. Referring to FIG. 5, the broadcast receiving device 200 receives service transmission information including channel combining information from the headend device 100 (operation 510). In this case, the service transmission information may be written and transmitted in the frame sync trailer portion of the video broadcast content transmitted in the form of a digital transmission frame.

Thereafter, the broadcast receiving device 200 checks whether the transmission channel receiving the service transmission information is the main transmission channel (step 515). The main transport channel or the sub transport channel may be checked using channel ID information included in the channel combining information. For example, the channel ID information lists the channel IDs of the combined transport channels in 7 bit units. The channel ID located at the front of the channel is the main transport channel, and the channel IDs listed thereafter may be the sub transport channels.

Next, when it is confirmed in step 515 that the main transmission channel is confirmed, the broadcast reception device 200 checks service transmission information to check operation state information of the headend device 100 (step 520). If the operation state of the headend device 100 is an initialization state or an activation state (YES, step 525), the broadcast reception device 200 checks whether the main transport channel of the previous transmission period is different from the main transport channel of the current transmission period. (Step 535). If the main transmission channel of the previous transmission period and the main transmission channel of the current transmission period are the same (NO in step 535: NO), the broadcast reception device 200 waits for reception of service transmission information for the next transmission period (step 540). ). That is, in this case, the broadcast reception device 200 determines that the same video broadcast service is received in the previous transmission period and the current transmission period, and thus does not perform an operation related to channel combining.

On the other hand, if the main transmission channel of the previous transmission period and the main transmission channel of the current transmission period is different (YES), the channel combining information is checked by checking the channel combining information (step 545). In operation 525, if the operation state of the headend device 100 is not an initialization state or a normal operation state (step 525: NO), it is determined whether the channel change state is performed (step 530). If the channel change state (step 530: YES), the channel combining information is checked by checking the channel combining information (step 545).

On the other hand, the broadcast reception device 200 checks the channel combining type information and, if the channel combining state (step 550: YES), allocates at least one or more sub transmission channels to each of the at least one QAM demodulator (step 560). In operation 565, the broadcast reception device 200 demodulates the video broadcast content received through the allocated main transport channel and the sub transport channel.

On the other hand, if the channel reception unit 200 is not coupled (step 550: NO), the broadcast reception device 200 demodulates the video broadcast content received through the main transmission channel (step 555).

In this way, when the demodulation process of the video broadcast content is completed, the broadcast receiving device 200 outputs the video broadcast content to a display device connected to the outside, or outputs the video broadcast content on the screen of the main body to provide it to the subscriber.

As described above, the broadcast receiving device 200 may check the service transmission information transmitted from the headend device 100, and may receive the video broadcast content through combining a plurality of transmission channels. Therefore, the broadcast receiving device 200 can use the ultra high resolution video broadcasting content such as 8K (7680 x 320).

As described above, although the present invention has been described with reference to the limited embodiments and the drawings, the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

100: head end device 200: broadcast receiving device
110: receiver 120: controller
130 modulator 210 demodulator
220: controller 230: output unit

Claims (20)

In the head-end device for transmitting and receiving with a broadcast receiving device through a cable network including a plurality of transmission channels,
A receiver configured to receive video broadcast content corresponding to the selected broadcast channel;
A plurality of modulation units that are mapped one-to-one with the plurality of transmission channels and modulate the video broadcasting content; And
Determine whether to combine the plurality of transport channels according to the resolution of the video broadcast content; and when the combining is determined, combine the plurality of transport channels and transmit the video broadcast content to the broadcast receiving device. Controller to control the modulator mapped to each
Headend device comprising a. The method of claim 1,
The controller,
A headend device for generating channel combining information corresponding to a result of the determination of the combining and controlling a modulation unit mapped to each of the combined transmission channels to transmit service transmission information including the channel combining information to the broadcast receiving apparatus. . The method of claim 2,
The service transmission information,
And the operation state information of the headend device indicating any one of an initialization state, an activation state, a reservation state, and a channel change state. The method of claim 2,
The service transmission information,
And a headend device written to the frame sync trailer of the video broadcast content. The method of claim 3,
The channel combining information,
Channel combining state information indicating whether the plurality of transmission channels are combined, channel combining type information indicating the number of coupling, channel combining order information indicating the combining sequence of the plurality of transmission channels, and changing the channel combining sequence indicating the changing of the combining sequence. And channel ID information comprising information and a channel ID corresponding to the combined transport channel. The method of claim 1,
The controller,
And determining a combination of the plurality of transmission channels when a transmission rate corresponding to the resolution of the video broadcasting content exceeds a transmission rate supported by any one of the plurality of transmission channels. The method of claim 1,
A storage unit for storing a channel information table for managing the broadcast channel and a channel ID corresponding to at least one transport channel for transmitting the video broadcast content among the plurality of transport channels;
Headend device further comprising. A broadcast receiving device for receiving video broadcast content from a headend device through a plurality of transmission channels formed on a cable network,
A plurality of demodulators; And
When service transmission information including channel combining information is received through at least one demodulator of the plurality of demodulators, each of the at least one demodulator may include at least one transport channel of the plurality of transmission channels according to the channel combining information. A controller that receives the video broadcast content by assigning to
Broadcast receiving device comprising a. The method of claim 8,
The service transmission information,
And an operation state information of the headend device indicating one of an initialization state, an activation state, a reservation state, and a channel change state. The method of claim 8,
The service transmission information,
And a broadcast reception device written in the frame sync trailer of the video broadcast content. 10. The method of claim 9,
The channel combining information,
Channel combining state information indicating whether the plurality of transmission channels are combined, channel combining type information indicating the number of coupling, channel combining order information indicating the combining sequence of the plurality of transmission channels, and changing the channel combining sequence indicating the changing of the combining sequence. And channel ID information including information and a channel ID corresponding to the combined transport channel. The method of claim 11,
The controller,
When service transmission information including channel combining information is received through at least one demodulator of the plurality of demodulators, the channel ID information is checked to determine whether a transport channel assigned to the at least one demodulator is a main transport channel. And if the main transmission channel is determined, allocates the at least one transmission channel to each of the at least one demodulator according to the operation state information or the channel combining type information. The method of claim 12,
The controller,
When the operation state information is the initialization state or the activation state, it is determined whether the main transmission channel of the previous transmission period and the main transmission channel of the current transmission period are the same, and if the same, the reception of the service transmission information for the next transmission period Standby broadcast receiving device. The method of claim 13,
The controller,
If the main transmission channel of the previous transmission period is different from the main transmission channel of the current transmission period, the channel combining type information is checked. If the channel combining type information is in a channel uncoupled state, the video broadcasting content is transmitted through the main transmission channel. And controlling the demodulator to which the main transport channel is assigned to receive and demodulate a signal. The method of claim 13,
The controller,
When the main transmission channel of the previous transmission period and the main transmission channel of the current transmission period are different, the channel combining type information is checked, and when the channel combining type information is in the channel combining state, at least one or more sub transmissions according to the number of combining. Assigning a channel to each of the at least one demodulator and receiving and demodulating the video broadcast content through the main transport channel and the sub transport channel, respectively, the demodulator assigned to the main transport channel and the sub transport channel. Broadcast receiving device for controlling the. The method of claim 12,
The controller,
When the operation state information is the channel change state, the channel combining type information is checked, and when the channel combining type information is a non-channel combining state, the main broadcasting channel receives and demodulates the video broadcasting content through the main transmission channel. And a broadcast reception device controlling the demodulator to which a transport channel is allocated. The method of claim 12,
The controller,
When the operation state information is the channel change state, the channel combining type information is checked, and when the channel combining type information is a channel combining state, the at least one demodulator performs at least one sub transmission channel according to the number of combinations. And each of the demodulators assigned to the main transport channel and the sub transport channel to receive and demodulate the video broadcast content through the main transport channel and the sub transport channel. Receiving service transmission information including channel combining information for the plurality of transmission channels from a headend device through a plurality of transmission channels formed on a cable network;
Receiving video broadcast content transmitted from the headend device through at least one transport channel of the plurality of transport channels according to the channel combining information; And
Demodulating the video broadcast content through at least one demodulator to which the at least one transport channel is mapped;
Video broadcast content receiving method of a broadcast receiving device comprising a. The method of claim 18,
The service transmission information,
And a video broadcast content receiving method of a broadcast receiving device, which is written in a frame sync trailer of the video broadcast content. The method of claim 18,
The channel combining information,
Channel combining state information indicating whether the plurality of transmission channels are combined, channel combining type information indicating the number of coupling, channel combining order information indicating the combining sequence of the plurality of transmission channels, and changing the channel combining sequence indicating the changing of the combining sequence. And channel ID information including information and a channel ID corresponding to the combined transport channel.

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