KR101947153B1 - Cable broadcasting sign receiver - Google Patents

Abstract

The present invention relates to a VOD system for identifying a VOD selected by a user and receiving frequency setting information for a VOD selected by a user from a broadcasting company, A frequency mapping storage for storing a frequency mapping information in which a first partial value forming an IP address is mapped to a frequency for each channel, a frequency mapping storage for storing the channel information or the frequency setting information, Determining a frequency of the corresponding channel included in the setting information, grasping the first partial value through the frequency mapping information, and calculating the number information related to the channel-specific program included in the channel information or the frequency setting information, And generates a second partial value constituting the IP address, so that the first partial value and the second partial value An IP control unit for transmitting the generated IP address to the IP network and transmitting the broadcast request signal used as a multicast IP address to which the IP address of the program is to be received, And an IP receiving module for interfacing with the IP network.

Description

{CABLE BROADCASTING SIGN RECEIVER}

The present invention relates to a cable broadcasting receiver.

Currently, a cable broadcasting company provides an Internet service in addition to a TV broadcasting service using the cable broadcasting infrastructure network shown in FIG. 1 is a diagram showing a conventional cable broadcasting infrastructure network. 1, a conventional cable broadcasting infrastructure network includes a coaxial cable network 20 for transmitting broadcast information (for example, real-time broadcasting information, video-on-demand information broadcast on demand), packets and the like transmitted to a cable broadcasting company 10, A cable broadcasting receiver 30 connected to the network 20 to receive and distribute broadcast information or packets, and a computer 41 (PC, notebook computer, etc.) 41 and a TV 42 which are end terminals connected to a cable broadcasting receiver . Here, the TV 42 is electrically connected to receive, receive, and transmit analog or digital broadcasting signals, and the computer 41 is connected to the cable broadcasting receiver via the Internet to enable Internet communication or Internet telephone.

In order to enable Internet service through a coaxial cable network, a cable modem termination system (CMTS) (A) is conventionally provided in the transmission system 10a of the cable broadcasting company 10 as shown in FIG. 2 And a cable modem B must be installed in the cable broadcasting receiver 30.

In addition, there is a problem that the available frequencies of the cable broadcasters are limited according to the frequency band supported by the cable modem B among the cable broadcasting receivers. For example, since a cable modem (B) supports only a band up to 870 MHz, there is a restriction that a cable broadcasting company can use a frequency up to 1002 MHz.

If a cable modem (B) is used, dedicated frequency allocation for the Internet service is required, and noise is generated at the upstream frequency by using a cable modem of a bandwidth sharing scheme. In addition, there is a problem that it is difficult to expand the bandwidth by using the cable modem (B).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cable broadcasting receiver that does not use a cable modem.

SUMMARY OF THE INVENTION The present invention provides a cable broadcasting receiver for use in a cable broadcasting service based on CCS.

Embodiments according to the present invention can be used to accomplish other tasks not specifically mentioned other than the above-described tasks.

According to an aspect of the present invention, there is provided a cable broadcast receiver including: a channel change processor for identifying a broadcast channel selected by a user and determining channel information about a broadcast channel; A VOD processing unit for receiving frequency setting information for a VOD selected by the user, a frequency mapping storage unit for storing frequency mapping information in which a first partial value forming an IP address is mapped to a frequency for each channel, The method comprising the steps of: receiving the frequency setting information, grasping a frequency of a corresponding channel included in the channel information or the frequency setting information, grasping the first partial value through the frequency mapping information, The number information related to the included program for each channel is substituted into the setting calculation formula, And generates an IP address using the first partial value and the second partial value, and generates an IP address for the channel-specific program by using the generated IP address as a multicast IP address An IP control unit for transmitting the used broadcast request signal to the IP network and receiving the broadcast information, and an IP receiving module for interfacing with the IP network.

The frequency mapping information is information in which the first partial value is recorded corresponding to a frequency for each channel, and the number information related to the program for each channel is at least one of a program number and a long-form channel number.

The first partial value is two values of (A.BC.D.) forming the IPv4 address system, and the second partial value is the remaining two values of (A.BC.D). Or the first partial value is an A and a B value among (A.BC.D.) values forming an IPv4 address system, and the second partial value is a C and a D value.

According to an embodiment of the present invention, it is possible to receive a cable broadcasting signal transmitted from a coaxial cable network through an IP network without using a cable modem.

Also, according to the embodiment of the present invention, the noise problem of the upward frequency is solved, and the bandwidth extension is facilitated.

1 is a diagram showing a conventional cable broadcasting infrastructure network.
2 is a block diagram showing a conventional cable broadcasting service system.
3 is a conceptual diagram of a CCS-based cable broadcasting service according to an embodiment of the present invention.
4 is a configuration diagram illustrating a CCS-based cable broadcasting service system according to an embodiment of the present invention.
5 is a flowchart illustrating an operation of a CCS-based cable broadcasting service system according to an embodiment of the present invention.
6 is a block diagram of a cable broadcasting receiver according to an embodiment of the present invention.
FIG. 7 is an operational flowchart of a cable broadcasting receiver according to the first embodiment of the present invention.
8 is a flowchart illustrating an operation of a cable broadcasting receiver according to a second 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 to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are used for the same or similar components throughout the specification. In the case of publicly known technologies, a detailed description thereof will be omitted.

In this specification, when a part is referred to as " including " an element, it is to be understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise. Also, the terms " part, " " module, " and the like, which are described in the specification, refer to a unit for processing at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software.

Hereinafter, a CCS-based cable broadcasting service system and a service method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

3, the concept of a CCS-based cable broadcasting service according to an embodiment of the present invention will be described. 3 is a conceptual diagram of a CCS-based cable broadcasting service according to an embodiment of the present invention.

Referring to FIG. 3, the CCS-based cable broadcasting service according to the embodiment of the present invention includes cable broadcasting information (e.g., real-time cable broadcasting information and on-demand video broadcasting information) transmitted through a coaxial cable network And transmits the IP broadcasting service through the IP network. The cable broadcasting receiver 30a according to the embodiment of the present invention receives the desired broadcasting from the cable broadcasting service converted into the IP broadcasting signal, and displays it on the screen.

The CCS-based cable broadcasting service dynamically generates an IP address corresponding to a program or VOD of a channel requested by the user when a user's channel or VOD request occurs, and transmits the generated IP address to a destination address The IP address of the cable broadcasting receiver 30a according to the embodiment of the present invention is used and the IP address is dynamically generated in the same manner as the cable broadcasting receiver 30a, An IP gateway 100 for transmitting a digital cable broadcast received through a coaxial cable network to an IP network is used. At this time, the value of the dynamically generated IP address varies depending on the channel-specific frequency and the channel-specific program. Accordingly, if the IP addresses dynamically generated in the IP gateway 100 and the cable broadcasting receiver 30a are the same, the digital cable broadcasting program transmitted from the IP gateway 100 through the IP network is transmitted to the target cable broadcasting receiver 30a ).

More specifically, the IP gateway 100 and the cable broadcasting receiver 30a use the frequency mapping information P1 and the dynamic IP address generation function P2 set to generate the dynamic IP.

The IPv4 address scheme has the form (ABCD). The value A is "112", the value B is "305", the value of C is "45", and the value of D is "6" if (ABC D) of the IPv4 address is (112.305.45.6) In the IPv4 address scheme, the CCS-based cable broadcasting service according to the embodiment of the present invention grasps the fixed A value and B value according to the frequency mapping information P1, Generate a value and a D value to generate an IP address of the form (ABC D). At this time, the dynamic IP address generation function P2 generates an IP address using a program number (Program ID) or generates an IP address using a long form channel number or a program number and a long form channel number . Of course, in addition to the program number and the long form channel number, information indicating a number among the information included in the cable broadcasting information can be used.
Here, the long-form channel number indicates a long-form channel number for each channel based on num_channels_in_section in a long-form virtual channel table included in OOB-SI (Out of Band System Information) information.

Here, the frequency mapping information P1 is information in which the A value and the B value are associated with each frequency band of each channel of the cable broadcasting. For example, the A value and the B value correspond to the frequency of each channel, . The frequency mapping information P1 is generated according to the frequency mapping rule P3 mounted on the IP gateway 100 and the IP gateway 100 provides the generated frequency mapping information P1 to each cable broadcast receiver 30a . The frequency mapping rule (P3) is managed and changed by the cable broadcaster.

The frequency mapping information may be a table value as shown in Table 1 below as an example.

     channel Frequency range (unit: MHz)       A value      B value 31 264-270 90 101 32 270 to 276 91 102 33 276-282 92 103 34 282-288 93 104 35 288 to 294 94 105 36 284-300 95 106 ... ... ... ... N 678 to 684 254 255

According to the CCS-based cable broadcasting service according to the embodiment of the present invention, the cable modem termination system (CMTS) (A in FIG. 2) is not used in the transmission system of the cable broadcasting, The modem (B in Fig. 2) may not be used. The cable broadcasting receiver 30a according to the embodiment of the present invention can be realized by mounting the frequency mapping information P1 in the conventional cable broadcasting receiver 30 in FIG. 2 and having the dynamic IP address generating function P2. The present invention can be applied to a CCS-based cable broadcasting service according to an embodiment of the present invention.

Hereinafter, a CCS-based cable broadcasting service system according to an embodiment of the present invention will be described with reference to FIG. 4 is a configuration diagram illustrating a CCS-based cable broadcasting service system according to an embodiment of the present invention.

Referring to FIG. 4, the CCS-based cable broadcasting service system according to the embodiment of the present invention includes an IP gateway 100 and a cable broadcasting receiver 30a.

The IP gateway 100 is connected to the cable broadcasting transmission system 10b and the coaxial cable network 20 and is connected to the network switch 60. [ The IP gateway 100 converts digital cable broadcasting signals (real-time broadcast signals, video-on-demand video signals, etc.) transmitted through the coaxial cable network 20 into IP signals used in the IP network and transmits the IP signals. At this time, the IP gateway 100 dynamically obtains an IP address by using at least one of the previously stored frequency mapping information (P1 in FIG. 3), the program number and the long form channel number corresponding to the received digital cable broadcasting signal Generates an IP address using the generated dynamic IP address generation function (hereinafter, it is the same as the IP address generation algorithm), and transmits the digital cable broadcasting signal as an IP signal conforming to the Internet protocol using the generated IP address.

The cable broadcasting receiver 30a is connected to the network switch 60 and is connected to an end terminal such as the PC 41 or the TV 42. [ The cable broadcast receiver 30a receives the broadcast information received from the network switch 60 and converts the broadcast information into information that can be displayed on the screen and transmits the broadcast information to the PC 41 or the TV 43, And transmits the packet received from the TV 42 to the network switch 60 and transmits the broadcast information to the TV 42 and requests the broadcast information requested by the TV 42 including the IP address to the network switch 60 ).

The cable broadcasting receiver 30a is connected to the network switch 60 and is connected to an end terminal such as the PC 41 or the TV 42. [ The cable broadcast receiver 30a transmits the broadcast information received from the network switch 60 to the PC 41 or the TV 42 or the user's channel or VOD selection signal received from the PC 41 or the TV 42 The network switch 60 generates an IP address corresponding to the corresponding channel or the corresponding VOD, places the generated IP address in the destination address field of the IP signal requesting the corresponding channel or VOD, and transmits the IP address to the network switch 60 And receives the broadcast information or the corresponding VOD through the IP network. The generated IP address is a multicast IP address to be received by the cable broadcast receiver 30a itself.

The network switch 60 is a communication device for connecting network units, and is a conventional network switch called a switching hub and a port switching hub. The network switch 60 distributes an IP packet signal or an IP streaming signal received from the IP network 50 connected to the IP gateway 100 or the transmission system 10b to one or more signals, (Destination address) of the broadcast request signal or the VOD request signal received from the cable broadcasting receiver 30a is the IP packet signal or the destination IP address of the IP streaming Address, it transmits the IP packet signal or the IP streaming to the corresponding cable broadcasting receiver 30a. Here, at least one network switch 60 is located between the IP gateway 100 and the cable broadcast receiver 30a.

On the other hand, the transmission system 10b does not use the cable modem termination system (CMTS), unlike the conventional transmission system that uses the cable modem termination system (CMTS). That is, the conventional transmission system provides VOD broadcasting information (video broadcast information on demand) from a customized VOD server in the transmission system to a cable modem termination system (CMTS) and sends VOD broadcasting information from the cable modem termination system (CMTS) The transmission system 10b applied to the embodiment of the present invention provides VOD broadcasting information to the network switch 60 directly from the VOD server in the transmission system 10b.

Therefore, the transmission system 10b of the cable broadcasting according to the present invention is one of various types of transmission systems generally used, except that the CMTS is not used, so a detailed description will be omitted.

Hereinafter, the operation of the CCS-based cable broadcasting service system according to the embodiment of the present invention will be described with reference to FIG. 5 is a flowchart illustrating an operation of a CCS-based cable broadcasting service system according to an embodiment of the present invention.

Referring to FIG. 5, the transmission system 10b of the cable broadcasting company transmits OOB-SI information and EPG information to the IP gateway 100 through the IP network (S501). The IP gateway 100 receives the OOB-SI information or the EPG information through the network switch 60 and extracts the frequency mapping rule P3 included in the OOB-SI information or the EPG information and internally sets it (S502) .

Then, the IP gateway 100 generates frequency mapping information P2 (e.g., a frequency mapping table) in which the A value and the B value are set corresponding to the channel-specific frequency of the cable broadcasting according to the set frequency mapping rule P3 S503).

After generating the frequency mapping information, the IP gateway 100 transmits all the cable broadcasting receivers 30a to the network switch 60 so that the cable broadcasting receivers 30a can receive the frequency mapping information P2 (S504). All the cable broadcasting receivers 30a receive and register the frequency mapping information P2 (S505). As a result, the IP gateway 100 and all the cable broadcasting receivers 30a share the same frequency mapping information P2.

In this state, the transmission system 10b transmits the digital cable broadcasting signal (including the VOD broadcasting signal) of the RF signal to the IP gateway 100 through the coaxial cable network (S506).

The IP gateway 100 demodulates the RF signal to extract a digital cable broadcast (including a VOD signal), divides the digital cable broadcast into cable broadcasts for each channel, and generates an IP address for the cable broadcast for each channel. That is, the IP gateway 100 obtains the A value and the B value of the IP address through the frequency mapping information (P2) for each channel frequency (S507), and compares the program number identified from the PSI information with the set IP address generation algorithm And generates a C value and a D value (S508).

The IP gateway 100 generates an IP address using the A value, the B value, the C value, and the D value, which are identified and generated as described above (S509), and transmits an IP signal And transmits it to the network switch 60 (S510).

On the other hand, in the cable broadcasting receiver 30a, after the frequency mapping information P2 is registered, if the user selects one channel or selects one VOD, the frequency for the channel or VOD selected by the user and the channel or VOD selected by the user And obtains the A value and the B value of the IP address by associating the obtained frequency with the frequency mapping information P2 and substitutes the identified program number into the IP address generation algorithm to determine the C value and the D value And generates an IP address corresponding to the channel or VOD requested by the user (S511).

Then, the cable broadcasting receiver 30a transmits a broadcasting request signal to the network switch having the generated IP address as a destination address in step S512. The network switch 60 then transmits the destination address of the IP signal transmitted from the IP gateway 100 And the destination address of the broadcast request signal received from the cable broadcast receiver 30a and provides the corresponding IP signal to the cable broadcast receiver 30a at step S513.

The cable broadcasting receiver 30a receives the IP signal corresponding to the IP address generated by the cable broadcasting receiver 30a, decodes it, and displays it on the screen (S514).

Hereinafter, the operation of the CCS-based cable broadcasting service system according to the embodiment of the present invention will be described with reference to FIG. 5 is a flowchart illustrating an operation of a CCS-based cable broadcasting service system according to an embodiment of the present invention.

Referring to FIG. 5, the transmission system 10b of the cable broadcasting company transmits OOB-SI information and EPG information to the IP gateway 100 through the IP network (S501). The IP gateway 100 receives the OOB-SI information or the EPG information through the network switch 60 and extracts the frequency mapping rule P3 included in the OOB-SI information or the EPG information and internally sets it (S502) .

Then, the IP gateway 100 generates frequency mapping information P2 (e.g., a frequency mapping table) in which the A value and the B value are set corresponding to the channel-specific frequency of the cable broadcasting according to the set frequency mapping rule P3 S503).

After generating the frequency mapping information, the IP gateway 100 transmits all the cable broadcasting receivers 30a to the network switch 60 so that the cable broadcasting receivers 30a can receive the frequency mapping information P2 (S504). All the cable broadcasting receivers 30a receive and register the frequency mapping information P2 (S505). As a result, the IP gateway 100 and all the cable broadcasting receivers 30a share the same frequency mapping information P2.

In this state, the transmission system 10b transmits the digital cable broadcasting signal (including the VOD broadcasting signal) of the RF signal to the IP gateway 100 through the coaxial cable network (S506).

The IP gateway 100 demodulates the RF signal to extract a digital cable broadcast (including a VOD signal), divides the digital cable broadcast into cable broadcasts for each channel, and generates an IP address for the cable broadcast for each channel. That is, the IP gateway 100 obtains the A value and the B value of the IP address through the frequency mapping information (P2) for each channel frequency (S507), and compares the program number identified from the PSI information with the set IP address generation algorithm And generates a C value and a D value (S508). Of course, the IP gateway 100 can dynamically generate an IP address using a long-form channel number, a program number, and a long-form channel number instead of the program number.

The IP gateway 100 generates an IP address using the A value, the B value, the C value, and the D value, which are identified and generated as described above (S509), and transmits an IP signal And transmits it to the network switch 60 (S510).

On the other hand, in the cable broadcasting receiver 30a, after the frequency mapping information P2 is registered, if the user selects one channel or selects one VOD, the frequency for the channel or VOD selected by the user and the channel or VOD selected by the user And obtains the A value and the B value of the IP address by associating the obtained frequency with the frequency mapping information P2 and substitutes the identified program number into the IP address generation algorithm to determine the C value and the D value And generates an IP address corresponding to the channel or VOD requested by the user (S511). Of course, the cable broadcasting receiver 30a can dynamically generate an IP address by using a long-form channel number, a program number, and a long-form channel number instead of the program number.

Then, the cable broadcasting receiver 30a transmits a broadcasting request signal to the network switch having the generated IP address as a destination address in step S512. The network switch 60 then transmits the destination address of the IP signal transmitted from the IP gateway 100 And the destination address of the broadcast request signal received from the cable broadcast receiver 30a and provides the corresponding IP signal to the cable broadcast receiver 30a at step S513.

The cable broadcasting receiver 30a receives the IP signal corresponding to the IP address generated by the cable broadcasting receiver 30a, decodes it, and displays it on the screen (S514).

Meanwhile, in the above-described embodiment, the A value and the B value are grasped using the frequency mapping information in the IP addresses of (A, B, C, and D), and at least one of the program number and the long- The C value and the D value are generated to generate the IP address, the present invention is not limited thereto.

That is, according to the embodiment of the present invention, the values to be grasped using the frequency mapping information may be C value, D value, A value, C value, B value and C value, B value and D value, The value generated using at least one of the -Form channel numbers may be the remaining two values excluding the value that is grasped using the frequency mapping information. This is based on the IPv4 address system and can be applied to the case of IPv6.

Hereinafter, a cable broadcast receiver 30a according to an embodiment of the present invention will be described in detail with reference to FIG. 6 is a block diagram of a cable broadcasting receiver according to an embodiment of the present invention.

6, the cable broadcasting receiver 30a according to the embodiment of the present invention includes a channel change processing unit 31, a VOD processing unit 32, an EPG information storage unit 33, an RF control unit 34, an IP control unit 35, a frequency mapping storage unit 36, an IP receiving module 37, a decoder 38, and an A / V output unit 39.

The channel change processing unit 31 grasps the broadcast channel selected by the user and grasps channel information on the broadcast channel from the EPG information storage unit 33. [ Here, the channel information includes frequency information of a corresponding broadcast channel, a TS (Transport Stream) ID, a program number (service ID), a long-form channel number, and the like.

 The VOD processing unit 32 identifies the VOD selected by the user, transmits the VOD identification information, and transmits frequency setting information of the VOD selected by the user. The frequency setting information is information provided through the IP network in the transmission system 10b at the request of the cable broadcasting receiver 30a and includes frequency information, TS (Transport Stream) ID, program number (service ID), Long -Form Channel number and so on.

 The EPG information storage unit 33 stores EPG (Electronic Program Guide) information for each program.

The RF control unit 34 receives channel information or frequency setting information for the broadcast channel or VOD selected by the user from the channel change processing unit 31 or the VOD processing unit 32 and provides the channel information or the frequency setting information to the IP control unit 35.

The IP control unit 35 has a function of having a dynamic IP address generation function P1 and requesting and receiving a broadcast channel or VOD selected by the user from the RF control unit 34 through the IP reception module 37 do. The IP control unit 35 receives the frequency mapping information P2 transmitted from the IP gateway module 100 from the IP receiving module 37 and stores the received frequency mapping information P2 in the frequency mapping storage unit 36. [

An example of an IP address generation algorithm for generating an IP address in the IP control unit 35 will be described in more detail. The destination multicast address, that is, the IP address is represented by, for example, an IPv4 format (ABC D) , C, and D have one of the values from 0 to 255. [ The IP control unit 35 recognizes the values of A and B corresponding to each channel through the frequency mapping information, and generates values of C and D using the program number or the long-form channel number according to the value.

The IP control unit 35 grasps the frequency of the broadcast channel or the VOD selected by the user and compares the A value and the B value of the IP address corresponding to the obtained frequency with the frequency mapping Using the frequency mapping information (P2) stored in the storage unit (36). The IP control unit 35 generates a C value and a D value of the IP address using at least one of the channel number of the broadcasting channel selected by the user or the program number and the Long_Form channel number included in the frequency setting information of the VOD selected by the user do.

As an example of a method of using the program number, a value obtained by dividing the program number by 255 is taken as the value of C, and a value obtained by adding "1" to the remaining value obtained by dividing the program number by 255 is taken as the value of D. An example of a method using a long-form channel number is a value obtained by dividing a long-form channel number by 255, a quotient obtained by adding a value of C, a residual value obtained by dividing a long form channel number by 255, Is the value of D. The method of using both program number and long-form channel number is to add, subtract or multiply each number, divide by 255, and use quotient or remainder value as C value or D value. The method of using both the program number and the long-form channel number can be varied in addition to the above description.

The IP control unit 35 finally generates an IP address using the A value, the B value, the C value, and the D value of the IP address, sets the generated IP address as the destination multicast address, And requests the selected VOD to the IP network.

The frequency mapping storage unit 36 is managed by the IP control unit 35 and stores frequency mapping information P2. The IP receiving module 37 is responsible for interfacing with the IP network.

The decoder 38 MPEG-decodes the digital broadcast signal or VOD received from the IP control unit 35 to obtain a pure broadcast signal. The A / V output unit 39 can recognize the decoded A / Modulated by the A / V signal and outputted to the outside so that the user can watch the corresponding channel or VOD through the screen.

Hereinafter, the operation of the cable broadcasting receiver according to the embodiment of the present invention will be described with reference to FIG. 7 and FIG.

FIG. 7 is a flowchart illustrating an operation of a cable broadcast receiver according to the first embodiment of the present invention, when a user selects one broadcast channel. 7, when the user selects one broadcast channel, the channel change processing unit 31 grasps the channel number selected by the user and inputs channel information about the identified channel number to the EPG information storage unit 33 in real time And receives channel information on the corresponding channel number (S1).

The channel change processing unit 31 provides the channel information received from the EPG information storage unit 33 to the RF control unit 34 and the RF control unit 34 controls the frequency of the corresponding channel included in the received channel information The program number or the long-form channel number, and provides at least one of the frequency and program number or the long-form channel number of the corresponding channel to the IP control unit 35 as frequency change information in step S3.

Upon receiving the frequency change information, the IP control unit 35 obtains the A value and the B value of the IP address corresponding to the frequency of the corresponding channel from the frequency mapping information P2 stored in the frequency mapping storage unit (S4). The IP control unit 35 substitutes at least one of the program number and the long-form channel number for the broadcast channel selected by the user into the IP address generation algorithm to generate the C value and the D value of the IP address, , C value, and D value, and transmits a broadcast request signal to the IP network through the IP module 37, using the generated IP address as a destination address (S5).

The IP receiving module 37 receives the cable broadcasting signal corresponding to the broadcasting request signal and provides the received cable broadcasting signal to the IP control unit 35 (S6).

Here, the cable broadcast signal is an IP signal having the same IP address as the destination address of the broadcast request signal as the destination address. The IP control unit 35 provides the received cable broadcasting signal to the decoder 38 so that the cable broadcasting is outputted on the screen of the TV 42 through the decoder 38 and the A / V output unit 39.

FIG. 8 is a flowchart illustrating an operation of a cable broadcast receiver according to a second embodiment of the present invention when a user selects one VOD. Referring to FIG. 8, when the user selects one VOD, the VOD processing unit 32 identifies the VOD selected by the user and provides the VOD identification information to the IP control unit 35 (S11).

The IP control unit 35 transmits the VOD selection information including the VOD identification information to the transmission system 10b via the IP reception module 37 (S12). At this time, the VOD selection information is transmitted to the IP network connected to the transmission system 10b, and has the fixed IP address as the source address.

Upon receiving the VOD selection information, the video server of the transmission system 10b identifies the VOD identification information and the source IP address included in the VOD selection information and transmits the VOD reception information corresponding to the VOD identification information to the corresponding cable broadcasting receiver (S13). Here, the VOD reception information includes frequency setting information corresponding to the VOD.

The VOD reception information transmitted to the cable broadcasting receiver 30a is received by the VOD processing unit 32 via the IP reception module 37 and the IP control unit 35. The VOD processing unit 32 receives the VOD reception information included in the received VOD reception information And provides the extracted frequency setting information to the IP control unit 35 through the RF control unit 34 (S14).

Upon receiving the frequency setting information, the IP control unit 35 extracts the A value of the IP address corresponding to the frequency of the VOD from the frequency mapping information P2 stored in the frequency mapping storage unit 36 using the frequency included in the frequency setting information And B values. The IP control unit 35 substitutes at least one of the program number and the long-form channel number included in the frequency setting information into the IP address generation algorithm to generate the C value and the D value of the IP address, C value, and D value, and transmits a VOD request signal to the IP network through the IP module 37, using the generated IP address as a destination address. The IP receiving module 37 receives the VOD corresponding to the VOD request signal and provides the received VOD to the IP control unit 35 (S15).

Upon receiving the VOD, the IP control unit 35 provides the received VOD to the VOD processing unit 32 so that the corresponding VOD is output on the screen of the TV 42 or the PC 41 (S17).

Meanwhile, in the above-described embodiment, the A value and the B value are grasped using the frequency mapping information in the IP addresses of (A, B, C, and D), and at least one of the program number and the long- The C value and the D value are generated to generate the IP address, the present invention is not limited thereto.

That is, according to the embodiment of the present invention, the values to be grasped using the frequency mapping information may be C value, D value, A value, C value, B value and C value, B value and D value, The value generated using at least one of the -Form channel numbers may be the remaining two values excluding the value that is grasped using the frequency mapping information. This is based on the IPv4 address system and can be applied to the case of IPv6.

In the above description, the calculation formula for generating the C value and the D value by using at least one of the program number and the long-form channel number is only an example, and the result is a variety of calculation formulas May be used.

In the above description, the cable broadcasting receiver 30a according to the embodiment of the present invention may omit the RF control unit 34. [

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It belongs to the scope.

10: cable broadcaster 20: coaxial cable network
30, 30a: Cable broadcasting receiver 41, 43: PC
42: TV 50: IP network
60: network switch 10a, 10b: transmission system
A: CMTS B: Cable modem
100: IP gateway, IP gateway 31: Channel change processing unit
32: VOD processing unit 33: EPG information storage unit
34: RF control unit 35: IP control unit
36: Frequency mapping storage unit 37: IP reception module

Claims (5)

A channel change processing unit for grasping a broadcast channel selected by the user and grasping channel information for a broadcast channel,
A VOD processing unit for identifying the VOD selected by the user and receiving frequency setting information for the VOD selected by the user from the transmission system of the broadcasting company,
A frequency mapping storage unit for storing frequency mapping information in which a first partial value forming an IP address is mapped to a frequency of each channel,
The method comprising: receiving the channel information or the frequency setting information, grasping a frequency of a corresponding channel included in the channel information or the frequency setting information, grasping the first partial value through the frequency mapping information, Generates a second partial value constituting an IP address by substituting the number information related to the program for each channel included in the frequency setting information into the setting calculation expression to generate an IP address with the first partial value and the second partial value, An IP control unit for transmitting a broadcast request signal, which is used as a multicast IP address to be received, to an IP network based on an IP address, a channel-specific program, and receiving the broadcast information;
An IP receiving module for interfacing with the IP network
/ RTI >
The frequency mapping information is information in which the first partial value is recorded corresponding to a frequency for each channel,
Wherein the number information related to each channel-specific program is at least one of a program number and a long-form channel number. delete The method of claim 1,
Wherein the first partial value is two values of the (ABCD) value constituting the IPv4 address system, and the second partial value is the remaining two values of the value of (ABCD). The method of claim 1,
Wherein the first partial value is an A and a B value of an (ABCD) value constituting the IPv4 address system, and the second partial value is a C and a D value. 4. The method according to claim 3 or 4,
Further comprising an RF control unit for receiving the channel information from the channel change processing unit, receiving the frequency setting information from the VOD processing unit, and providing the received channel information or the frequency setting information to the IP control unit.

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