KR101517501B1 - The method and system for providing IPTV(internet protocol television) service - Google Patents

Abstract

Disclosed is a method for providing IPTV service and a system thereof. A method for providing internet protocol television (IPTV) may include: a step wherein a cable modem transmits a channel change protocol (CCP) message to a DOCSIS IPTV bypass architecture (DIBA) switched digital video (SDV) system via cable modem termination system (CMTS); and a step wherein the cable modem receives an IP stream, which is allocated based on the CCP message via a quardrature amplitude modulation (QAM) channel from the DIBA SDV system. The CCTV message contains information about an IP stream to be changed, and the DIBA SDV system transmits an IP stream only, which is directed based on the CCP message, via the QAM channel.

Description

[0001] The present invention relates to a method and system for providing an IPTV service,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and system for providing an IPTV service in a photo-coaxial hybrid network (hereinafter referred to as " HFC (hybrid fiber coaxial cable) network "), and more particularly to an IPTV service Method and system.

Internet service providers are required to install a cable modem termination system (hereinafter referred to as "CMTS") in a distribution center or a communication station, install a cable modem in the subscriber premises, connect the CMTS and the cable modem to the HFC network To provide Internet services.

In recent years, Internet service providers are providing internet protocol broadcasting (hereinafter referred to as " IP (internet protocol) -TV ") services by connecting a set top box to a cable modem. These CMTSs and cable modems communicate using frequency bands not used in IP-TV broadcasting. The frequency band not used in IP-TV broadcasting is mainly used as a frequency band for Internet service.

In order to simultaneously provide IP-TV service in the Internet service of the HFC network, a large bandwidth is required. However, since existing Internet service uses only a part of frequency bands, it has many difficulties to provide IP-TV service which must provide a large number of broadcast channels at the same time.

Korean Patent Laid-Open No. 10-2009-0127507 [Title: Method and Apparatus for Providing Communication Service Using IPTV]

One aspect of the present invention provides a method for providing an IPTV service.

Another aspect of the present invention provides a system for providing an IPTV service.

A method for providing an IPTV (Internet Protocol Television) service according to an aspect of the present invention is a method in which a cable modem transmits a channel change protocol (CCP) message for channel change to a DOCSIS IPTV bypass architecture (SDV) through a cable modem termination system digital video system, and the cable modem may receive an IP stream allocated based on the CCP message over a quadrature amplitude modulation (QAM) channel from the DIBA SDV system, wherein the CCP message The DIBA SDV system may transmit only the IP stream indicated on the basis of the CCP message through the QAM channel.

Meanwhile, the cable modem receives the CCP discovery message from the DIBA SDV system at the time of initial booting, and the CCP discovery message may include the IP address of the CCP port of the DIBA SDV system.

In addition, the cable modem receives an SGID search message including a service group identifier (SGID) from the DIBA SDV system at the time of initial booting, and the cable modem may operate in a subgroup identified by the SGID.

In addition, the DIBA SDV system divides a viewer who receives an IP stream through the cable modem into an IPTV stream selection state or an IPTV stream viewing state, and the DIBA SDV system supports a viewer corresponding to the IPTV stream viewing state The IPTV stream selection state is a state in which the selection of an IP stream by the viewer is performed, and the IPTV stream viewing state is a state in which viewing of the specific IP stream of the viewer is performed Lt; / RTI >

In addition, the DIBA SDV system transmits a plurality of expected IPTV streams when the viewer is in the IPTV stream selection state, and the plurality of predicted IPTV streams are based on time division multiplexing (TDM) or frequency division multiplexing Lt; RTI ID = 0.0 > QAM < / RTI > channel.

In an IPTV service providing system according to another aspect of the present invention, the IP service providing system transmits a channel change protocol (CCP) message for channel change to a DOCSIS IPTV bypass (DIBA) through a cable modem termination system (CMTS) and a DIBA SDV system for transmitting an IP stream allocated based on the CCP message to the cable modem through a QAM (Quadrature Amplitude Modulation) channel, The CCP message includes information on an IP stream to be changed, and the DIBA SDV system can transmit only the indicated IP stream based on the CCP message on the QAM channel.

Meanwhile, the cable modem receives the CCP discovery message from the DIBA SDV system at the time of initial booting, and the CCP discovery message may include the IP address of the CCP port of the DIBA SDV system.

Also, the cable modem receives an SGID search message including an SGID (subgroup identifier) from the DIBA SDV system at the time of initial booting, and the cable modem may operate in a subgroup identified by the SGID.

In addition, the DIBA SDV system divides a viewer who receives an IP stream through the cable modem into an IPTV stream selection state or an IPTV stream viewing state, and the DIBA SDV system supports a viewer corresponding to the IPTV stream viewing state The IPTV stream selection state is a state in which the selection of an IP stream by the viewer is performed, and the IPTV stream viewing state is a state in which viewing of the specific IP stream of the viewer is performed Lt; / RTI >

In addition, the DIBA SDV system transmits a plurality of expected IPTV streams when the viewer is in the IPTV stream selection state, and the plurality of predicted IPTV streams are based on time division multiplexing (TDM) or frequency division multiplexing Lt; RTI ID = 0.0 > QAM < / RTI > channel.

According to an aspect of the present invention, in providing an IPTV service, a QAM (Quadrature Amplitude Modulation) channel is allocated only to broadcasts requested by a viewer, and a QAM channel is not allocated to broadcasts not requested by viewers, Resources can be efficiently used to accommodate a large capacity of broadcasting channels in comparison with the QAM capacity (frequency band).

1 is a conceptual diagram illustrating a DOCSIS IPTV Bypass Architecture (DIBA) system.
2 is a conceptual diagram illustrating a method of transmitting an IPTV stream according to an embodiment of the present invention.
3 is a conceptual diagram illustrating an IPTV stream transmission method according to an embodiment of the present invention.
4 is a conceptual diagram illustrating a DIBA SDV system according to an embodiment of the present invention.
5 is a conceptual diagram illustrating an IPTV stream transmission method according to an embodiment of the present invention.
6 is a conceptual diagram illustrating an SGID search method according to an embodiment of the present invention.
7 is a conceptual diagram illustrating a subgroup allocation method according to an embodiment of the present invention.
8 is a conceptual diagram illustrating a method of allocating an IPTV stream to a viewer in an IPTV stream selection state according to an embodiment of the present invention.
9 is a conceptual diagram illustrating a method of providing an expected IPTV stream according to an embodiment of the present invention.
10 is a conceptual diagram illustrating a method of providing an expected IPTV stream according to an embodiment of the present invention.
11 is a conceptual diagram illustrating a method of transmitting an IPTV stream in initial connection according to an embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a conceptual diagram illustrating a DOCSIS IPTV Bypass Architecture (DIBA) system.

Referring to FIG. 1, the DIBA system may not use downlink transmission based on a CMTS (Cable Modem Termination System) 100 in providing an IPTV service in a hybrid fiber coax (HFC) network 120. The DIBA system can transmit multicast traffic (e.g., broadcast data or IPTV stream) to the subscriber's home via the direct HFC network 120. [ Hereinafter, the term IPTV stream may refer to specific broadcast data transmitted through a cable modem based on the HFC network 120 such as multicast traffic, broadcast data, and broadcast channel.

When the IPTV service is provided based on the CMTS 100 instead of the HFC network 120, the bandwidth of the downlink data provided by the CMTS 100 is consumed and the expansion of the CMTS 100 due to the increase of data need. Therefore, in the DIBA system, the IPTV service can be provided based on the HFC network 120 without using the CMTS 100 resource.

In DIBA system, IPTV service can be performed based on DOCSIS standard. The DOCSIS standard has the following features.

In the DOCSIS standard, services are defined based on the combination of uplink and downlink channels. In order to increase the maximum data transmission / reception speed that can be provided to the user through the CM 130, the uplink / downlink channel combination is transmitted to the CM 130 through four or more downlink channel reception devices and four or more uplink channel transmission devices. As shown in FIG. Thus, when uplink / downlink channel combinations are used, they can provide up to four times the downlink 1 channel uplink 1 channel rate, respectively.

The coaxial cable used in the cable network can transmit a frequency signal of 5 to 785 MHz. In general, the frequency band of 5 to 45 MHz is used as an upstream band for uplink / downlink bi-directional signal transmission, May be used for the transmission of the downlink signal as the downlink band. The upstream band may be included in the frequency-divided uplink channels of 1.6MHz, 3.2MHz or 6.4MHz units. The downlink band may include frequency-division downlink channels of 6MHz and 8MHz units.

The signals are transmitted / received using the QAM modulation / demodulation scheme on the uplink / downlink channels generated through the frequency division. Therefore, the channels in the cable network can be expressed by the terms downlink QAM channel, uplink QAM channel. Downstream QAM channels can use 64QAM or 256QAM modulation. Upstream QAM channels can use QPSK, 16QAM, 32QAM, 64QAM, 128QAM, and 256QAM modulation.

An uplink QAM channel using a 64QAM modulation scheme with a 6.4MHz channel width can provide a 30Mbps rate and a downlink QAM channel using a 256QAM modulation scheme with a 6MHz channel width can provide a 42Mbps speed. If a 256 QAM modulation scheme is used for an 8 MHz bandwidth, the downlink QAM channel can provide a 50 Mbps rate.

For example, a CM 130 having four downlink channel receiving devices and four uplink channel transmitting devices can receive four downlink QAM channels at the same time, and can simultaneously transmit four uplink QAM channels . Therefore, up to 4x42M = 168Mbps upward, up to 4x30M = 120Mbps can be supported.

In order for a specific application service such as FTP (file transfer protocol) to enjoy an improved rate through channel-combining, the transmitting side must be able to distribute packets to the combined channels and the receiving side must re- Should be able to do.

In the case of the downlink traffic, the CMTS 100 and the CM 130 are responsible for packet distribution and coupling, respectively. In case of the uplink traffic, the CMTS 100 and the CM 130 can perform reverse inverse functions.

The DIBA system can use not only channel combining but also enhanced IP multicast support technology and enhanced security technology such as source specific multicast (SSM) support and multicast QoS / payload header suppression (PHS) support.

As described above, the downlink transmission in the DIBA system can be performed based on the HFC network 120. [ In the DIBA system, a DOCSIS encapsulated multicast stream may be delivered to the CM 130 via EQAM (edge QAM). The EQAM 110 may be a system in which a gigabit Ethernet is connected to an input terminal and a plurality of QAM modulators and an upconverter are connected to an output terminal.

The DIBA system is an architecture for delivering IPTV streams from the cable head end with CMTS structure and DOCSIS functionality. Specifically, in the DIBA system, the IPTV stream can be directly transmitted to the EQAM 110 without going through the CMTS core 100. [ If the CMTS core 100 is to be used for the IPTV stream service, a lot of expensive CMTS core 100 equipment may be required. The DIBA system defines a transport structure in which an IPTV stream is subscribed through the EQAM equipment 110 without going through the CMTS core 100 to avoid such waste. That is, in the DIBA system, the IPTV stream including the high-quality IP video content can be tunneled from the IPTV server to the EQAM equipment 110 through the cable operator's transmission network.

Hereinafter, a method of transmitting an IPTV stream by efficiently utilizing a transmission resource is disclosed in an embodiment of the present invention.

2 is a conceptual diagram illustrating a method of transmitting an IPTV stream according to an embodiment of the present invention.

2, the mapping relationship between the QAM channel and the IPTV stream may be changed according to the request of the CM 230 in the DIBA switched digital video (SDV) scheme according to an embodiment of the present invention. The DIBA SDV scheme can transmit only the IPTV stream corresponding to the broadcast channel desired by the viewer.

When the DIBA SDV scheme is used, the IPTV stream is not fixedly allocated to each QAM channel but can be adaptively allocated to the QAM channel according to whether the viewer is watching or not.

Referring to FIG. 2, the CM 230 may request a channel change to the CMTS 200 based on a channel change protocol. Specifically, the viewer can request a channel change, and the cable modem 230 can convert the channel change request of the viewer into a channel change protocol message (or a CCP message) and transmit the channel change request message to the CMTS 200.

The CMTS 200 can forward the CCP message to the DIBA SDV system operating in the DIBA SDV manner. In the DIBA SDV system, a QAM channel may be allocated only to an IPTV stream corresponding to a channel desired by a viewer, and a QAM channel may not be allocated to a channel that the viewer does not want to view.

Each of the IPTV streams may be transmitted to the CM 230 via the healed QAM channel and the HFC network 220. By using this method, frequency resources can be efficiently used.

3 is a conceptual diagram illustrating an IPTV stream transmission method according to an embodiment of the present invention.

The top of FIG. 3 shows the mapping relationship between the IPTV stream and the QAM channel in the existing DIBA system.

3, in an existing DIBA system, an IPTV stream corresponding to all broadcast channels can be fixedly allocated to each QAM channel and transmitted. In this case, the QAM channel increases in proportion to the increase of the broadcast channel to be served. When the QAM channel allocation method is used, QAM channels are allocated to broadcast channels that are not watched, so frequency resource use may be inefficient and unnecessary transmission resources may be increased.

3 illustrates a mapping relationship between an IPTV stream and a QAM channel in a DIBA SDV system according to an embodiment of the present invention.

The DIBA SDV technology allocates a QAM channel only for a broadcast channel having a viewer request, and does not allocate a QAM channel for a broadcast channel not being watched. Therefore, more efficient broadcast channels can be relatively serviced based on the same QAM channel capacity (frequency band) by efficiently using frequency resources.

4 is a conceptual diagram illustrating a DIBA SDV system according to an embodiment of the present invention.

In Fig. 4, a DIBA SDV system is specifically disclosed.

The DIBA SDV system may include a channel management unit 400, a resource management unit 410, a DOCSIS encapsulator 420, and a signal modulator 430.

The channel management unit 400 may be connected to the CMTS to receive channel change information based on the CCP message from the CMTS, and to manage the channel based on the channel change information. When there is a request of a channel change of the viewer, the cable modem can convert the request of the channel change of the viewer into a CCP message and deliver it to the CMTS. The CMTS can transmit a CCP message to the channel management unit 400. [

The resource management unit 410 can reset the mapping relationship between the IPTV stream and the QAM channel based on the CCP message transmitted to the channel management unit 400. [ The resource management unit 410 can perform QAM channel allocation for the IPTV stream corresponding to the new broadcast channel and / or QAM channel recovery for the IPTV stream corresponding to the existing broadcast channel based on the reset mapping relationship.

The DOCSIS encapsulator 420 may perform DOCSIS data framing on the IPTV stream input from the multicast backbone and transmit the DOCSIS data frame to the signal modulator 430.

The signal modulator 430 may perform QAM-based signal modulation and transmit it to the cable modem through the HFC network.

5 is a conceptual diagram illustrating an IPTV stream transmission method according to an embodiment of the present invention.

When a viewer receiving an IPTV service changes a channel, an internet group management protocol (IGMP) join message is transmitted from a set top box (STB) 510 to a cable modem (CM) 500, 510 to the CCP message and transmit the CCP message to the DIBA SDV system 520.

In order for the cable modem 500 to transmit the CCP message to the DIBA SDV system 520, the cable modem 500 needs to know the CCP port IP address of the DIBA SDV system 520 being serviced. In the conventional case, the CCP port IP address is assigned to the CFG (configuration file) of the cable modem 500 (for example, the cable modem configuration file) so that the cable modem 500 can obtain the CCP port IP address. In this case, a separate cable modem CFG file needs to be managed for each distribution center. In the embodiment of the present invention, a CCP search method for solving such a problem is disclosed.

The DIBA SDV system 520 may broadcast the multicast traffic having the promised group IP to the entire QAM channel including the CCP search message including its own CCP port IP address.

The cable modem 500 may receive the CCP discovery message at the initial boot time and obtain the IP address of the CCP port included in the CCP discovery message. Since the cable modem 500 automatically obtains the CCP port IP address included in the CCP search message at boot time, it is not necessary to set a separate CFG file for each distribution center. That is, based on the broadcast of the CCP port IP address through the CCP search message, it is possible not to manage a separate cable modem CFG file for each distribution center.

6 is a conceptual diagram illustrating an SGID search method according to an embodiment of the present invention.

The frequency utilization efficiency of the DIBA SDV system may be better as the number of concurrent viewers is smaller. The smaller the number of simultaneous viewers, the smaller the number of simultaneous viewing channels, and the less frequency channels are used. Therefore, in order to increase the frequency utilization efficiency in the DIBA SDV system, the viewers (or subscribers) receiving services in one DIBA SDV system are physically divided in the RF layer and divided into service groups (Service Groups, SG ) 600 as shown in FIG.

Each service group 600 can be assigned a unique SGID (SG identifier). The cable modem of the viewer belonging to the specific SG 600 can transmit the CCP message including the SGID. In this case, the DIBA SDV system can process the channel change request based on the service group 600.

For this service group 600 based operation, the SGID may be specified in the CFG file (cable modem configuration file) of the cable modem. In this case, there is a problem that a separate cable modem CFG file needs to be managed for each service group 600. [ In an embodiment of the present invention, an SGID discovery method for solving this problem is disclosed.

The DIBA SDV system can transmit the SGID search message including the SGID for each service group 600 to the SDV QAM channel in the multicast traffic having the promised group IP in advance. The cable modem can receive the SGID search message at initial boot up and obtain the SGID contained in the message. Since the cable modem automatically obtains the SGID at boot time, there is no need to set up a separate CFG file for each service group 600.

If the DIBA SDV system includes an SGID that is not valid in the CCP message sent by the cable modem, it may instruct the cable modem that transmitted the SGID to be tuned to the SDV QAM. This way, the cable modem can obtain a valid SGID.

7 is a conceptual diagram illustrating a subgroup allocation method according to an embodiment of the present invention.

FIG. 7 illustrates a subgroup allocation method for increasing the efficiency of data transmission through frequency resources.

Generally, when watching IPTV, a viewer can select an IPTV stream and view the selected IPTV stream. According to an embodiment of the present invention, a viewer can be classified into one of an IPTV stream selection state 700 for selecting an IPTV stream and an IPTV stream viewing state 720 for viewing a selected IPTV stream . A viewer located in the IPTV stream selection state 700 may be represented by an IPTV stream selection viewer and a viewer located in the IPTV stream viewing state 720 may be expressed as an IPTV stream viewing state viewer.

For example, the DIBA SDV system may determine whether the CCP message transmitted from the cable modem is transmitted and determine whether the viewer is in an IPTV stream selection state 700 or an IPTV stream viewing state 720. For example, if the DIBA SDV system determines that the viewer is in the IPTV stream selection state 700 when a CCP message is sent and if no additional CCP message is sent within a time period of one minute or more after the CCP message is sent, And can be determined to be the viewing state maintenance state 720. This classification is exemplary and may be used to classify the viewer's condition based on various other methods.

According to the embodiment of the present invention, the DIBA SDV system can include a viewer corresponding to the IPTV stream viewing state 720 in a specific subgroup according to the viewing channel. As shown in FIG. 6, the DIBA SDV system can include viewers in a specific subgroup and allocate SGIDs for service groups.

The SG (Service Group) can be determined when a cable modem is installed in the viewer's premises as a physically divided group at the RF level. The cable modem can automatically obtain the ID of the SG to which it belongs at the initial boot. All cable modems that receive SDV services must be assigned a unique SGID to identify the cable modem.

In contrast, the DIBA SDV system can separately manage the viewers corresponding to the IPTV stream selection state 700 without including them in the subgroup. In the case of the viewer corresponding to the IPTV stream selection state 700, since the CCP message may be continuously transmitted, the DIBA system may not include the viewer corresponding to the IPTV stream selection state 700 in the subgroup. If the viewer corresponds to the IPTV stream selection state 700, the DIBA SDV system may estimate and transmit the expected IPTV stream to the QAM channel for the viewer's modified IPTV stream.

8 is a conceptual diagram illustrating a method of allocating an IPTV stream to a viewer in an IPTV stream selection state according to an embodiment of the present invention.

FIG. 8 shows a method of performing IPTV stream allocation to a viewer in an IPTV stream selection state. FIG. 8 shows a method for supplying a rapidly selected IPTV stream to a viewer in an IPTV stream selection state.

The viewer in the IPTV stream selection state can continuously transmit the CCP message until the IPTV stream to be watched is determined. When the DIBA SDV system receives the CCP message and allocates the IPTV stream according to the CCP message to the QAM channel and transmits the IPTV stream, Delay may occur until the IPTV stream is received.

Referring to FIG. 8, the DIBA SDV system may reduce the number of transmissions of the CCP message, determine the expected IPTV stream to quickly provide the IPTV stream to the viewer in the channel selection state, and provide the expected IP stream over the QAM channel .

The expected IP stream may be determined based on various methods. The expected IPTV stream may be an IPTV stream allocated to a consecutive large number of IPTV channels or an IPTV stream allocated to consecutive small number of IPTV channels based on an IPTV channel corresponding to a currently provided IPTV stream. The viewer can select the channel through the process of increasing or decreasing the IPTV channel. At this time, an IPTV stream allocated to a consecutive large number of IPTV channels or an IPTV stream allocated to consecutive small number of IPTV channels is provided as a predicted IPTV stream through a QAM channel in advance, Stream.

Alternatively, an expected IPTV stream may be provided based on the viewer ' s preferred channel information. The DIBA SDV system may determine and provide an IPTV stream corresponding to an IPTV channel that a viewer mainly views as an expected IPTV stream based on the viewing history of an existing viewer.

The expected IPTV stream may be a plurality of IPTV streams, and a plurality of IPTV streams may be transmitted through a QAM channel in a time division multiplexing (TDM) manner.

9 is a conceptual diagram illustrating a method of providing an expected IPTV stream according to an embodiment of the present invention.

Referring to FIG. 9, a plurality of predicted IPTV streams may be provided to a viewer in an IPTV stream selection state in a TDM manner. When a plurality of expected IPTV streams are provided in a TDM scheme, an IPTV stream for a rapidly selected IPTV channel can be provided to a viewer without delay.

When the DIBA SDV system provides three expected IPTV streams (first expected IPTV stream, second expected IPTV stream, third predicted IPTV stream), a time interval corresponding to a certain period is assigned to each of the three expected IPTV streams The expected IPTV stream can be transmitted in each time interval. If the predetermined period is 3 seconds, the first expected IPTV stream is transmitted during the first 1 second interval (first time), the second expected IPTV stream is transmitted during the second 1 second interval (second time), and the third 1 second interval The third expected IPTV stream may be transmitted.

Each of the plurality of transmitted expected IPTV streams may be stored in a set-top box of a viewer for a predetermined period of time. If the channel selected by the IPTV channel selection of the viewer is a channel corresponding to the expected IPTV stream, the cable modem can be transmitted the stored expected IPTV stream without transmitting a separate CCP message for channel change.

10 is a conceptual diagram illustrating a method of providing an expected IPTV stream according to an embodiment of the present invention.

Referring to FIG. 10, a plurality of predicted IPTV streams may be provided to viewers in the IPTV stream selection state in an FDM manner. When a plurality of expected IPTV streams are provided in the FDM scheme, an IPTV stream for a rapidly selected IPTV channel can be provided to a viewer without delay.

When the DIBA SDV system provides three expected IPTV streams (first expected IPTV stream, second expected IPTV stream, third predicted IPTV stream), the entire frequency bandwidth corresponding to the QAM channel is divided into three sub-frequency bandwidths . Specifically, a first expected IPTV stream is provided on the first sub-frequency band, a second expected IPTV stream is provided on the second sub-frequency band, and a third expected IPTV stream is provided on the third sub- have.

When divided into sub-frequency bandwidths, the amount of data that can be transmitted over the sub-frequency bandwidth may be reduced. Thus, the DIBA SDV system can reduce the amount of data in the transmitted IPTV stream.

For example, the DIBA SDV system can reduce the data amount of the IPTV stream by using a method of reducing the resolution of the IPTV stream or reducing the number of total frames transmitted within a predetermined time.

When using this method, the user can receive the IPTV stream with a lower image quality in the IPTV stream selection state, but can quickly scan the IPTV channel information. If the viewer is then switched to a state of watching the IPTV stream, the DIBA SDV system can transmit the IPTV stream over the entire frequency bandwidth.

11 is a conceptual diagram illustrating a method of transmitting an IPTV stream in initial connection according to an embodiment of the present invention.

Referring to FIG. 11, the DIBA SDV system can preferentially transmit an IPTV stream corresponding to a viewer's preferred IPTV channel after initial connection.

That is, a preferred IPTV stream can be determined and a preferred IP stream can be provided over the QAM channel. The DIBA SDV system can store information on the preferred IPTV channel of the viewer in advance. Thereafter, when the viewer first boots up the cable modem, the IPTV stream corresponding to the preferred IPTV channel may be transmitted first through the QAM channel.

As described above, the DIBA SDV system can transmit an IPTV stream corresponding to a plurality of preferred IPTV channels based on the TDM scheme or the FDM scheme when there is a plurality of preferred IPTV channels.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

100: CMTS 110: EQAM
120: HFC network 130: CM
400: Channel management unit 410: Resource management unit
420: DOCSIS Encapsulator 430: Signal modulator

Claims (10)

A method for providing an internet protocol television (IPTV) service,
Transmitting a channel change protocol (CCP) message for channel change to a DOCSIS IPTV bypass architecture (SDV) system via a cable modem termination system (CMTS);
The cable modem receiving an IP stream allocated based on the CCP message over a quadrature amplitude modulation (QAM) channel from the DIBA SDV system,
The CCP message includes information on an IP stream to be changed,
The DIBA SDV system transmits only the indicated IP stream based on the CCP message on the QAM channel,
The cable modem receives a CCP discovery message from the DIBA SDV system at initial boot,
Wherein the CCP discovery message includes a CCP port IP address of the DIBA SDV system. delete The method according to claim 1,
The cable modem receives an SGID search message including a service group identifier (SGID) from the DIBA SDV system at the initial boot,
Wherein the cable modem operates in a subgroup identified by the SGID. The method of claim 3,
The DIBA SDV system divides a viewer who receives an IP stream through the cable modem into an IPTV stream selection state or an IPTV stream viewing state,
The DIBA SDV system allocates the SGID only to a cable modem corresponding to a viewer corresponding to the IPTV stream viewing state,
Wherein the IPTV stream selection state is a state in which the selection of an IP stream by the viewer is performed,
Wherein the IPTV stream viewing state is a state in which viewing of a specific IP stream of the viewer is performed. 5. The method of claim 4,
Wherein the DIBA SDV system transmits a plurality of expected IPTV streams when the viewer selects the IPTV stream,
Wherein the plurality of expected IPTV streams are transmitted over the QAM channel based on time division multiplexing (TDM) or frequency division multiplexing (FDM). An IPTV (Internet Protocol Television) service providing system,
A cable modem for transmitting a channel change protocol (CCP) message for channel change to a DOCSIS IPTV bypass architecture (SDV) system via a cable modem termination system (CMTS); And
And a DIBA SDV system for transmitting an IP stream allocated based on the CCP message to the cable modem through a quadrature amplitude modulation (QAM) channel,
The CCP message includes information on an IP stream to be changed,
The DIBA SDV system transmits only the indicated IP stream based on the CCP message on the QAM channel,
The cable modem receives a CCP discovery message from the DIBA SDV system at initial boot,
Wherein the CCP search message includes a CCP port IP address of the DIBA SDV system. delete The method according to claim 6,
The cable modem receives an SGID search message including a service group identifier (SGID) from the DIBA SDV system at the initial boot,
Wherein the cable modem operates in a subgroup identified by the SGID. 9. The method of claim 8,
The DIBA SDV system divides a viewer who receives an IP stream through the cable modem into an IPTV stream selection state or an IPTV stream viewing state,
The DIBA SDV system allocates the SGID only to a cable modem corresponding to a viewer corresponding to the IPTV stream viewing state,
Wherein the IPTV stream selection state is a state in which the selection of an IP stream by the viewer is performed,
Wherein the state of watching the IPTV stream is a state in which viewing of a specific IP stream of the viewer is performed. 10. The method of claim 9,
Wherein the DIBA SDV system transmits a plurality of expected IPTV streams when the viewer selects the IPTV stream,
Wherein the plurality of expected IPTV streams are transmitted through the QAM channel based on time division multiplexing (TDM) or frequency division multiplexing (FDM).

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