KR101660438B1 - CATV and Digital Terrestrial TV multi channel Broadcasting System having IP Packetization Apparatus - Google Patents

Abstract

The present invention relates to a multichannel broadcasting system having an IP packet conversion apparatus capable of managing various supplementary services by providing an interface for existing communication service users to receive existing CATV services on the same subscriber Ethernet line or xDSL line, A digital terrestrial television broadcast and a CATV broadcasting service system is connected to an access network and an HE (Head End) of an FTTX (Fiber to the x) or AON (Active Optical Network) system connected to a CO A receiving means connected between the HFC (Hybrid Fiber Coaxial Cable) network and an IP packet converting apparatus connected to the receiving means, for converting an MPEG2-TS stream into an IP packet and delivering the IP video stream through a gigabit Ethernet interface .

Description

[0001] The present invention relates to a multi-channel broadcasting system having an IP packet converter,

The present invention relates to a multi-channel tuner and a multi-channel demodulator for selectively receiving channels desired by a plurality of users of broadcast digital terrestrial TV broadcast and CATV broadcast channels, and to convert an MPEG2-TS stream received from the multi- To a CATV broadcast channel IP packet converter having an IP packetization processing tool for delivering a multi-channel audio / video stream to a dense subscriber in an IP manner. By using this device, it is possible to convert existing broadcasting service channels into IP packets, to enable existing broadcasting services to a plurality of smart devices in the home, and to provide a variety of media play devices capable of receiving low- Which enables multi-room service.

HFC (Hybrid Fiber Coaxial Cable) network, which is built in Korea, provides cable broadcasting service to 15 million subscribers and broadband Internet service to 5 million subscribers and is an important information communication infrastructure with a home pass rate of over 90% in the whole country.

Since the HFC network allocates 200 multi-channel real-time broadcasts to the RF frequency, all channels are transmitted to the subscriber terminal apparatus and are switched at the terminal apparatus. Therefore, compared to the IP system, It has many advantages in terms of quality.

It will also be the easiest way to evolve into UHD broadcasting like 4K which will be coming soon. However, CMTS (Cable Modem Termination System) technology for high-speed Internet data service in HFC network must provide many channels with more than 24 ~ 32 channels in order to provide high-speed data with high traffic speed. -End) Both devices and terminal devices can not be realistic alternatives due to rapid price increase and restriction of RF frequency allocation.

As a result, CATV operators are installing fiber to the home (FTTH) equipment rather than CATV and HFC equipment in new green sites. And a separate CATV network is being built for the broadcasting service. In order to reduce such double investment, it is necessary to use the existing broadcasting facilities as it is, and to select equipment for broadband Internet service.

Currently, the CATV STB (Set-top Box) is used in the home environment of the CATV subscribers, and the subscriber who intends to additionally connect a plurality of TVs must additionally install an expensive STB. Therefore, complicated power wiring and communication cables are widely used because the adapters to supply power to various devices must be individually connected.

As an example of a technique for converting an MPEG2-TS stream into an IP packet and delivering it, a multimedia terminal apparatus for a passive optical network having a CATV multi-channel receiver and an IP packetization processing tool is disclosed in Patent Document 1, A cable TV multi-channel receiver for receiving channels desired by a plurality of users among TV broadcast and cable TV broadcast channels which are broadcasted using a separate optical wavelength and which accepts a network (passive optical network) termination function, Discloses a multimedia terminal device for passive optical networks having an IP packetization processing tool that converts an MPEG2-TS stream into IP packets for delivery.

Patent Document 2 discloses a technique for converting broadcast signals received from a broadcast network to electrical signals and converting them into optical digital broadcast signals, converting the electrical signals received from the communications network into electrical signals, And demultiplexing the multiplexed optical signal into an optical digital broadcasting signal and an optical communication signal, separating the optical digital broadcasting signal and the optical communication signal into optical digital broadcasting signals and optical communication signals, respectively, And is provided to the subscriber to provide a low-cost optical device for eliminating the distortion of the broadcast signal according to the non-linear characteristics of the optical device and for enhancing the noise by increasing the S / N ratio and performing the operation. Stream) is separated from BE (Best Effort) data and transmitted, thereby ensuring QoS in the processing of the broadcast stream It is disclosed for transmitting communication-integrated system.

Korean Registered Patent No. 10-1400427 (Registered on May 21, 2014) Korean Patent Publication No. 2006-0067054 (published on Jun. 19, 2006)

Currently, telecom operators are offering subscribers by offering services such as telephone, high-speed Internet, broadcasting and WiFi in a combined form. Due to the widespread use of smart devices (smartphones, tablet PCs, etc.) and the explosion of Internet traffic, it is difficult to deliver high-speed Internet data, 200-channel video stream data, and UHD video streams to subscribers through the same All-IP network.

It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide an IP communication method and a mobile communication method in which all the cable broadcasting and terrestrial broadcasting are transmitted by IP in accordance with the reality that individuals carry smart devices and demand various services, Channel broadcast system having an IP packet conversion apparatus capable of receiving various smart devices.

It is another object of the present invention to provide an IP packet conversion service which enables a plurality of channel services using a low-cost device such as a low-priced dongle type instead of a separate CATV set-top box, And a multi-channel broadcasting system including the apparatus.

It is another object of the present invention to provide an MPEG TS to IP conversion apparatus for broadcasting digital terrestrial TV broadcasting and CATV broadcasting.

In order to achieve the above object, a multichannel broadcasting system having an IP packet conversion apparatus according to the present invention is a system for broadcasting digital terrestrial TV broadcasting and CATV broadcasting, and includes a FTTX (Fiber to the receiving means connected to an access network of an AON (Active Optical Network) scheme or an HFC (Hybrid Fiber Coaxial Cable) network connected to an HE (Head End) And transfers the IP video stream through the gigabit Ethernet interface.

In addition, in the multi-channel broadcasting system according to the present invention, the receiving means receives service information supplied from the CO and the HE using the optical wavelength, and transmits the service information to the first Ethernet subscriber aggregation switch or the xDSL DSLAM aggregation device And a second receiver for receiving and selectively receiving a plurality of channel information desired by each user from a broadcast TV broadcast or a CATV broadcast channel directly received from a receiver, a CATV, or a broadcast receiving module.

In the multi-channel broadcasting system according to the present invention, the IP packet converter includes a 1: n RF splitter for receiving and distributing a CATV input, a recovered RF video input from a satellite receiver or a terrestrial RF video signal, A plurality of tuner and demodulator modules for IP packetization of the RF signals distributed from the splitter, a gigabit aggregation switch for aggregating IP packets received from the plurality of tuners and demodulator modules into one gigabit Ethernet, And a main process of controlling the display device.

Also, in the multi-channel broadcasting system according to the present invention, the plurality of tuners and demodulator modules may include a plurality of tuners for selecting channels by using reception channel selection information of subscribers allocated from the RF signals distributed from the 1: n RF splitter, A plurality of demodulators for demodulating the signal in accordance with a demodulation method in the channel, and a TS-to-IP converter for IP packetizing the recovered packet from the MPEG-TS signal of the demodulator.

Further, in the multi-channel broadcasting system according to the present invention, the TS to IP converter receives the recovered MPEG2-TS signal through the plurality of demodulators, restores 188-byte packets in the signal, A plurality of MPEG-TS input receiving units for selectively receiving and transmitting only packets having PIDs registered in respective PID tables for respective ports, a plurality of RXs for temporarily storing the packets transmitted from the MPEG- A scheduler for reading packets stored in the memory from the plurality of RX queues in order and storing the packets in a memory storage unit; a memory for storing a plurality of packets read from the memory and storing the collected packets in a TCP / IP or UDP / IP packet, a forward engine and a packet editor for performing DTCP processing and data processing for SRM when necessary, and then converting the packet into a 1518-byte packet, A network connection controller for storing packets received from the engine and the packet editing unit in a plurality of TX queues according to a priority of a corresponding packet, a priority transmission controller for transmitting packets stored in the plurality of TX queues in a priority order, A scheduler, a forward engine and a packet editing unit, a network connection control unit, and a priority transmission control unit, respectively.

In order to achieve the above object, an MPEG TS to IP conversion apparatus according to the present invention is an MPEG TS to IP conversion apparatus provided for service of digital terrestrial TV broadcasting and CATV broadcasting to be broadcast, and is provided with each modulated tuner and demodulation module After recovering the 188-byte packet in the signal, the PID (13 bits) in the header is compared with the MPEG2-TS signal received through the plurality of tuners and the plurality of demodulators, and the PID registered in the PID table A plurality of RX queues for temporarily storing packets transmitted from the MPEG-TS input receiving unit, and a scheduling unit for sequentially scheduling the packets from the plurality of RX queues A scheduler for reading stored packets and storing them in a memory storage unit; a memory storing unit for reading packets of the stream, collecting a plurality of packets, A forward engine and a packet editing unit for converting the packet received from the forwarding engine and the packet editing unit into a UDP / IP packet, performing DTCP processing and data processing for SRM if necessary, and converting the packet into a 1518 byte packet, A priority transmission control unit for transmitting packets stored in the plurality of TX queues in a priority order, a scheduler, a forward engine and a packet editing unit, And a control processor for controlling the operation states of the connection control unit and the priority transmission control unit, respectively.

In the MPEG TS to IP conversion apparatus according to the present invention, in order to manage the plurality of RX queues, the scheduler performs scheduling in a round robin format in a queue order. When the RX Queue_ID is smaller than the buffer number, (Read_pointer) and a WP (Write pointer) of the corresponding queue are read out from the queue, and when the WP is smaller than the RP, the operation is performed until the same.

In the MPEG TS to IP conversion apparatus according to the present invention, in order to manage the plurality of RX queues, the scheduler provides a queue service with priority according to the storage level of the buffer stored in the queue.

Recently, the spread of smart devices accelerates the growth rate of traffic and demands the increase of the transmission speed of the access network. As the Ubiquitous information communication environment develops, it is expected that the change request of the network such as All IP of the access network will be radically expanded . In addition, digitalization of content and development of transmission technology accelerates the convergence of digital contents, thereby breaking down the boundary between services, and integration of services in voice / data, wired / wireless, broadcasting / communication, etc. is actively performed. Among them, integration of broadcasting and communication services is inevitable. In order to converge broadcasting and communication, telecommunication companies are already pursuing convergence of operators, technology / network convergence, service convergence, and terminal convergence.

Thus, according to the multi-channel broadcasting system having the IP packet conversion apparatus according to the present invention, existing communication service users can provide an interface for receiving existing CATV services on the same subscriber Ethernet line or xDSL line, The service can be managed and the operation cost can be greatly reduced.

According to the multi-channel broadcasting system having the IP packet converter according to the present invention, the HFC network, which is the base of the high-speed data network, allocates 200 multi-channel real-time broadcasts to the RF frequency and transmits all channels to the subscriber terminal device Since the switching is performed in the terminal device, the maximum advantage in terms of broadcast quality is maintained as compared with the IP method, and the existing facilities of the HE are used as it is in accordance with the evolution of the network, thereby enabling broadcasting services to various smart devices in the subscriber's premises .

In addition, according to the multi-channel broadcasting system having the IP packet conversion apparatus according to the present invention, it is possible to minimize the investment cost in the digital conversion and IP conversion in the existing optical CATV network, and various smart devices (smart phone, tablet PC, It is also possible to provide high quality video stream data of more than 200 channels at the same time.

1 is a configuration diagram of a multi-channel broadcasting system having an IP packet conversion apparatus according to the present invention;
FIG. 2 is a block diagram of a CATV broadcast channel IP packet conversion apparatus shown in FIG. 1;
3 is a block diagram of the MPEG2 TS to IP converter shown in FIG. 2;
4 is a flowchart of the scheduler shown in FIG.

These and other objects and novel features of the present invention will become more apparent from the description of the present specification and the accompanying drawings.

First, the concept of the present invention will be described.

The present invention relates to a multi-channel tuner and a multi-channel demodulator for selectively receiving channels desired by a plurality of users of broadcast digital terrestrial TV broadcast and CATV broadcast channels, and to convert an MPEG2-TS stream received from the multi- There is provided a CATV broadcast channel IP packet conversion apparatus having an IP packetization processing apparatus for delivering multi-channel audio / video streams to dense subscribers in an IP manner. By utilizing this IP packet converter, it is possible to convert all existing broadcasting service channels into IP packets, to enable existing broadcasting services to a plurality of smart devices in the home, and to provide various broadcasting services It enables multi-room service through play devices.

The present invention receives channel information to be received from a plurality of receivers or media player boxes in a subscriber's premises or a dense residential space, receives MPEG2-TS (Transport Stream) packets from selected and received broadcast data according to selected channel information, And a CATV multi-channel IP packet converter for receiving a CATV broadcast channel from a variety of subscriber IP terminals.

Currently, among the 19 million subscribers of domestic high-speed access networks, the number of subscribers is 37.7%, FTTH subscribers 28.9% and HFC subscribers 24.4%. Of all households, 39.6% are single-family homes and 46.85% are apartments. Most apartments have LAN and FTTH, some use xDSL, and most single-family homes use either HFC or VDSL. In the present invention, only the advantages according to various subscriber access schemes are collected, and the CATV and terrestrial transmission are delivered using the existing CATV transmission network, and the IP packet conversion device is installed at the location of the aggregator of the access method of each subscriber, And selectively converts the received IP into IP according to the channel information and transmits it to each subscriber access line.

The use of broadcasting media by households is 7.9% for terrestrial and 89.1% for paid broadcasting. As such, due to the characteristics of Korea, which has a high proportion of pay-TV broadcasting, investment costs and subscriber rate increase due to the transition to digital broadcasting have become important digital conversion barriers. Given these circumstances, it will be a burden to fund cable modem upgrades to upgrade high-end HE equipment, digitalize STBs for all CATV subscribers, and speed up broadband Internet speeds. Accordingly, in the present invention, an additional broadcast multi-channel reception and IP conversion device is added while utilizing the existing network structure of an existing service provider, and broadcasting service is easily converted to IP, thereby enabling broadcasting service to all subscribers and various smart devices.

Hereinafter, the configuration of the present invention will be described with reference to the drawings.

A multi-channel broadcasting system according to the present invention includes a CATV multi-channel receiver for selectively receiving channels desired by a plurality of users among broadcasting digital terrestrial TV broadcasting and CATV broadcasting channels, and an MPEG2-TS stream The IPTV packet conversion apparatus has an IP packetization processing function for delivering the IP packetization processing function to the CATV channel IP packet conversion apparatus.

1 is a block diagram of a multi-channel broadcasting system having an IP packet conversion apparatus according to the present invention.

As shown in FIG. 1, the multi-channel broadcasting system according to the present invention is a system for broadcasting digital terrestrial TV broadcasting and CATV broadcasting,

(Fiber to the X) or AON (Active Optical Network) access network connected to the CO (Central Office) 10 and an HFC (Hybrid Fiber Coaxial Cable) network connected to the HE An IP packet converter 200 connected to the connected receiving means 100 and 70 and the receiving means 100 and 70 for converting an MPEG2-TS stream into an IP packet and delivering the IP video stream through a gigabit Ethernet interface, .

As shown in FIG. 1, the receiving units 100 and 70 receive service information supplied from the CO 10 using a light wavelength, and are connected to various Ethernet subscriber aggregation switches 30 or xDSL DSLAM aggregation devices A first receiver 100 connected to the first broadcasting receiver 40 and a second receiver 100 connected to the first broadcasting receiver 40. The first receiver 100 receives service information supplied from the HE 50, And a second receiver 70 for receiving and selectively receiving channel information.

Accordingly, in the multi-channel broadcasting system according to the present invention, desired channel information inputted from each subscriber is received in a packet form, and the selected broadcasting channel is recovered and converted into IP, so that various smart devices in the home can also perform the same broadcasting service do.

Also, as shown in FIG. 1, the terminal is connected to a conventional L2 switch 30 or an XDSL aggregation device 40, which provides broadband Internet service, and provides a CATV distribution service at the same time.

In addition, CATV providers utilize a portion of the existing HFC transmission network 60 to provide an IP-based video stream to each subscriber while simultaneously providing a CATV stream service, It meets various needs of the subscriber.

In addition, since MPEG2 TS video packets are converted into IP packets, they can be interfaced with low-cost IP-STBs without expensive STBs, and can be received by smart TVs and simple application programs. It enables the reception of CATV channels without STBs on smart devices such as various tablets, and provides 1: N multi-screen services and various smart services.

As described above, in the present invention, the advantages of the CATV transmission network and the broadband transmission network to which the PON technology is applied are integrated into one by applying one optical fiber and RF overlay technology. For example, in the case of a dense subscriber such as an apartment, a device such as an L2 Ethernet switch 30 is installed in a terminal box in the underground of each building (building), and each subscriber residing in the same building is connected to an Ethernet line Service.

It is possible to receive the restored electric broadcast signal through the separate first receiver 100 connected to the existing CATV transmission network or to transmit the CATV signal recovered from the nearby existing CATV ONU to the coaxial A CATV broadcast channel IP packet converter 200 for distributing the MPEG2-TS stream recovered from the video stream contained in the broadcast signal to the TV existing in the house or various smart devices, . When the subscriber access network is xDSL, the broadcast signal received through the same first receiver 100 is tuned, demodulated, IP-converted according to the requested channel information of subscribers connected to the corresponding first receiver 100, And a CATV broadcast channel IP conversion apparatus 200 for delivering an IP-converted broadcast stream to all subscribers connected to the CATV channel.

Next, a configuration of an IP packet conversion apparatus according to the present invention will be described with reference to FIG.

2 is a block diagram of a CATV broadcast channel IP packet conversion apparatus shown in FIG.

FIG. 2 shows a detailed block configuration for implementing a CATV broadcast channel IP conversion apparatus. Here, as an example, consideration is given to a configuration for, for example, 24 subscribers, and at least two channels can be simultaneously selected for each subscriber. In the present invention, the broadcasting input of the CATV broadcasting channel IP conversion apparatus is defined as an RF electrical signal, and the optical signal for 1550 nm RF video is filtered from the optical signal inputted through the PON network interface in front of the RF signal, (Photoelectric conversion device) may be separately provided, or the RF electric signal recovered from the ONU 70 of the HFC network may be directly received.

2, the IP packet converter 200 includes a 1: n RF splitter 210 for receiving and distributing a CATV input, a recovered RF video input from a satellite receiver, or a terrestrial RF video signal, a plurality of tuner and demodulator modules 220 for IP packetization of the RF signals distributed from the RF splitter 210, and a plurality of tuners and demodulator modules 220 for aggregating IP packets received from the plurality of tuners and demodulator modules 220 into one gigabit Ethernet A flash memory 250 which stores basic driving programs and can permanently store the history of the failure logs of the apparatus, and a flash memory 250 which is programmed And a RAM memory 260 for storing the data.

One RF video input signal has more than 200 broadcast channels in the band from 54 MHz to 1 GHz downward, and the SI information can be received from the subscriber STB or the SI server of the service providers. The 1: n RF splitter 210 includes n tuners and demodulation modules 220, which are each modularized, for transmitting RF electric signals inputted from the outside to a plurality of tuners and demodulators. ). ≪ / RTI > At this time, it is possible to perform the amplification considering the power demand prediction (Power Budget) of the required signal according to the total number (n * m) of tuners connected.

One CATV broadcast channel IP conversion apparatus 200 restores and demodulates a channel desired to be received by the terminals connected to the total (n * m) subscriber lines connected to the subordinate device managed by itself, among all the CATV channels, MPEG2 TS packets, converts them into IP packets, and delivers them to each subscriber. Since the number of channels to be provided is large, it is divided into n tuners and demodulation modules 22, and m channels are managed again in one tuner and demodulation module. In order to implement this, the CATV broadcasting channel IP conversion apparatus 200 determines the number of CATV channels to be provided per subscriber (c = 2) corresponding to the number of subscribers managed by the present embodiment (s = 24) c = n * m The total number of tuners and demodulators (s * c = 24 * 2 = 48 = 8 * 6, m * n) However, in order to implement all of these tuners and demodulators at the same time, it is appropriate to separate them into modules.

For this purpose, the plurality of tuner and demodulator modules 220 may include a plurality of tuners 222 for selecting channels using reception channel selection information of subscribers allocated from RF signals distributed from the 1: n RF splitter 210, A plurality of demodulators 223 for demodulating signals in accordance with a demodulation scheme in the channel, and a TS-to-IP converter 224 for IP packetizing the recovered packets from the MPEG-TS signal of the demodulator.

That is, in this embodiment, a plurality of tuner and demodulator modules 220 are divided into a tuner and a demodulator module 1 to a tuner and a demodulator module n as shown in FIG. 2, and one tuner and demodulator module 220 are divided into m Tuner and demodulator. In this embodiment, one MPEG2-TS to IP packet conversion apparatus 200 includes a demodulator 223 for mounting six tuners 222 for tuning m = 6 channels simultaneously and demodulating the six channels, And receives the MPEG TS stream received from the demodulator 223 and simultaneously IP-packetizes the MPEG2-TS stream. Thus, the tuner and demodulator module 220 are modularized into one unit. Therefore, one RF video signal can be processed by a 1: n * m splitter by the total number of channels, but the signal is distributed in a two-stage structure considering quality and stability after signal distribution.

The first received 1: n RF splitter 210 divides the branch by n = N / m and branches the signal to each tuner and demodulator module 220. In each tuner and demodulator module 220, a splitter 221 is provided to perform a function of branching signals to m tuners 222 required therein. The six IP packet streams generated by each of the tuner and demodulator module 220 are multiplexed into one Ethernet flow, and the IP packet streams are multiplexed again through the aggregation switch 230 ) To 1: 1. The TS-IP converter 224 in each of the n tuners and the demodulation module receives the control of the main process 240 in an in-band manner using an Ethernet communication line, And sets required parameters. The main process 240 receives reception channel information and a channel change message from an external terminal device and manages the TS-IP converter 224 of the tuner and demodulation module 220 allocated to the subscriber through a message communication procedure Control function.

According to the present invention, when a plurality of channels are allocated in response to a channel change request from a video receiving apparatus in a subscriber premises, a fixed number of tuners and demodulators are fixedly allocated according to the minimum number of channels to be provided to each subscriber for convenience of implementation A static method may be used, and a tuner and a demodulator may be dynamically allocated so that a desired channel is sequentially selected irrespective of each subscriber. In addition, it is possible to effectively manage the same broadcast channel request selected by another subscriber by using a method of multicasting the generated IP packet using the IP multicasting protocol without allocating the tuner and the demodulator.

The plurality of tuners 222 included in the tuner and demodulator module performs a function of extracting a corresponding channel according to the identifier information of a TV program desired to be received by the terminal device at the subscriber's premises. The recovered electric signals are transmitted to a connected QAM & 8VSB demodulator 223, and demodulate the 8VSB system in order to receive digital terrestrial broadcasting. If the selected channel is an existing CATV channel, it performs demodulation by the QAM method. In this embodiment, the number of channels to be simultaneously processed in the tuner and demodulator module 220 is assumed to be 6. [ Thus, six tuners 222 and six demodulators 223 are shown. In actual implementation, a demodulation unit integrated with a tuner integrated with multiple channels can be used.

However, in the present embodiment, each channel is shown in order to distinguish a plurality of channels. The tuner 222 selectively tunes the ATSC & NTSC standard, QAM type North American CATV system data. The channel information on the frequency for reception is received using the channel exchange protocol determined from the subscriber terminal device. The demodulator 223 incorporates 8 VSB and 64/256 QAM demodulation functions and provides compatibility with the ATSC A / 53 8/16-VSB and ITU-T J.83 Annex B 64/256 QAM standards. The data recovered to the MPEG2-TS stream after passing through the demodulator 223 is transferred to the MPEG2 TS-to-IP converter 224. The MPEG TS-to-IP converter 224 receives the MPEG- Packetized by UDP / IP method and transmitted to Ethernet. Then, the IP packet stream generated by each tuner and demodulation module 220 is multiplexed by the aggregation switch 230, which is an Ethernet switch, and transmitted to the outside through one gigabit Ethernet line.

Next, the TS to IP converter 224 will be described with reference to FIG.

3 is a block diagram of the MPEG2 TS to IP converter shown in FIG.

3, the TS to IP converter 224 according to the present invention is an MPEG TS to IP converter. The TS to IP converter 224 includes a plurality of tuners 222 in each modulated tuner and demodulation module 220, (13 bits) in the header after receiving the MPEG2-TS signal recovered through the PID table 2250 for each port, restoring the 188-byte packet in the signal, and comparing the PID A plurality of RX queues 2242 functioning as buffers and temporarily storing the packets transmitted from the MPEG-TS input receiving unit 2241, a plurality of RX queues 2242 for temporarily storing the packets transmitted from the MPEG- A scheduler 2243 which sequentially schedules and stores the packets stored in the memory storage unit 2244 from the plurality of RX queues 2242, and a memory unit 2244 for reading packets of the stream from the memory storage unit 2244, , For example, seven, and send it via TCP / IP or UD A forwarding engine and packet editing unit 2245 for processing the packet into a P / IP packet, performing DTCP processing and data processing for SRM when necessary, and then converting the packet into a 1518-byte packet, A network connection control unit 2247 for storing packets in a plurality of TX queues 2246 in accordance with the priority of corresponding packets, a priority transmission control unit 2247 for transmitting packets stored in the plurality of TX queues 2246, And a control processor 2249 for controlling the operation states of the scheduler 2248, the forward engine and packet editor 2245, the network connection controller 2247, and the priority transmission controller 2248, respectively.

The control process unit 2249 is connected to the main process 240 shown in FIG. 2 through a control bus. The main process 240 and the control process unit 2249 may be integrated to use one CPU .

The scheduler 2243 performs scheduling in a round-robin fashion in order of queue to manage the plurality of RX queues 2242. When the RX Queue_ID is smaller than the number of buffers, the scheduler 2243 notifies the control processor 2249 of the queue RP (Read_pointer) and WP (Write pointer) are read, and when WP is smaller than RP, it is read until it is the same.

In order to manage the plurality of RX queues 2242, the scheduler 2243 provides queuing services by prioritizing the queues according to the storage level of the buffers stored in the queues.

This will be described in detail with reference to FIG.

4 is a flowchart of the scheduler shown in FIG.

4, the scheduler 2243 serving the RX queue 2242 in the MPEG2-TS to IP converter 224 may be configured to determine whether the ID of the RX queue 2242 is, for example, It is assumed that there are two RX queues 2242 per line and each line, and the total RX queue 2242 is assumed to be twelve.

The scheduler 2243 reads packets while increasing RX-Queue_ID = 0 to RX Queue_ID = 11. If the RX Queue_ID is less than 12, it reads the RP (Read_pointer) and WP (Write pointer) of the queue from the process and reads it until the same WP is smaller than RP And performs the exporting operation.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

By using the multi-channel broadcasting system equipped with the IP packet converter according to the present invention, the existing communication service users can provide the interface to receive the existing CATV service on the same subscriber Ethernet line or xDSL line.

200: IP packet converter
210: 1: n RF splitter
220: tuner and demodulator module
230: Collective switch
240: main processor

Claims (8)

A system for providing digital terrestrial TV broadcasting and CATV broadcasting,
Receiving means connected between an access network of an FTTX (Fiber to the X) scheme or an AON (Active Optical Network) system connected to a CO (Central Office) and an HFC (Hybrid Fiber Coaxial Cable) network connected to an HE (Head End)
And an IP packet converter connected to the receiving means for converting an MPEG2-TS stream into an IP packet and delivering the IP video stream through a gigabit Ethernet interface,
The IP packet conversion apparatus includes a TS-to-IP converter,
The TS-to-IP converter receives the restored MPEG2-TS signal through a plurality of tuners and a plurality of demodulators in each modular tuner and demodulator module, restores a 188-byte packet in the signal, A plurality of MPEG-TS input receiving units for selectively receiving and transmitting only packets having PIDs registered in the PID tables for the respective ports by comparing the received packets with the PID table of the corresponding port, and temporarily storing the packets transmitted from the MPEG-TS input receiving unit A plurality of RX queues, and a scheduler for sequentially reading and storing packets that are scheduled and stored from the plurality of RX queues in a memory storage unit.
The method according to claim 1,
The receiving means receives the service information supplied from the CO and the HE using the optical wavelength, the first receiver connected to the various Ethernet subscriber aggregation switches or the xDSL DSLAM aggregation devices connected to the optical cable, the broadcaster directly received from the CATV or the broadcasting reception module And a second receiver for receiving and selectively receiving a plurality of channel information desired by each user among casting TV broadcasts or CATV broadcast channels.
3. The method of claim 2,
The IP packet converter includes a 1: n RF splitter for receiving and distributing a CATV input, a recovered RF video input from a satellite receiver, or a terrestrial RF video signal, an IP packetization process for the RF signal distributed from the 1: n RF splitter A plurality of tuner and demodulator modules, a gigabit aggregation switch for aggregating IP packets received from the plurality of tuner and demodulator modules into one gigabit Ethernet, and a main process for controlling the gigabit aggregation switch Multichannel broadcasting system.
The method of claim 3,
The plurality of tuner and demodulator modules may include a plurality of tuners for selecting a channel using reception channel selection information of subscribers allocated from RF signals distributed from the 1: n RF splitter, and demodulating the signals according to a demodulation method in the channel A plurality of demodulators and a TS-to-IP converter for IP packetizing the recovered packets from the MPEG-TS signals of the demodulator.
5. The method of claim 4,
The TS to IP converter
The memory storage unit reads the packets of the corresponding stream, collects a plurality of packets, processes them into TCP / IP or UDP / IP packets, performs data processing for DTCP processing and SRM if necessary, Forward engine and packet editor,
A network access control unit for storing the packets received from the forward engine and the packet editing unit in a plurality of TX queues according to a priority order of the packets,
A priority transmission controller for transmitting packets stored in the plurality of TX queues in accordance with a priority order,
Further comprising a control processor for controlling operation states of the scheduler, the forward engine and the packet editing unit, the network connection control unit, and the priority transmission control unit, respectively.
An MPEG TS to IP conversion apparatus provided for service of broadcast digital terrestrial TV broadcasting and CATV broadcasting,
After receiving the restored MPEG2-TS signal through a plurality of tuners and a plurality of demodulators in each modulated tuner and demodulation module, the 188-byte packet in the signal is recovered, and then the PIDs (13 bits) in the header are compared, A plurality of MPEG-TS input receiving units for selectively receiving and transmitting only packets having PIDs registered in the per-port PID table,
A plurality of RX queues for temporarily storing packets transmitted from the MPEG-TS input receiver,
A scheduler for scheduling the plurality of RX queues in order to store the packets stored in the memory storage unit,
The memory storage unit reads the packets of the corresponding stream, collects a plurality of packets, processes them into TCP / IP or UDP / IP packets, performs data processing for DTCP processing and SRM if necessary, Forward engine and packet editor,
A network access control unit for storing the packets received from the forward engine and the packet editing unit in a plurality of TX queues according to a priority order of the packets,
A priority transmission controller for transmitting packets stored in the plurality of TX queues in accordance with a priority order,
And a control processor for controlling operation states of the scheduler, the forward engine and the packet editing unit, the network connection control unit, and the priority transmission control unit, respectively.
The method according to claim 6,
In order to manage the plurality of RX queues, the scheduler performs scheduling in a round-robin manner in a queue order. When the RX Queue_ID is smaller than the number of buffers, the scheduler transmits an RP (Read_pointer) ) Is read, and if the WP is smaller than the RP, it is read until it is the same.
The method according to claim 6,
Wherein the scheduler provides a queue service by prioritizing the plurality of RX queues according to a storage level of a buffer stored in the queue to manage the plurality of RX queues.

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