CN104469535B - A kind of method and device of the INVENTIONBroadcast video IPization based on C-DOCSIS systems - Google Patents

Abstract

The present invention proposes a kind of method and device of the INVENTIONBroadcast video IPization based on C DOCSIS systems, all business may be implemented in C DOCSIS system platforms, include the IPization etc. of internet business, VOD service and INVENTIONBroadcast video, meet the target of the integration of three networks, user networking can also be simplified, reduce network construction and maintenance cost.Realize that INVENTIONBroadcast video IPization can make full use of the big bandwidth characteristic of CMC equipment, and the transmission of INVENTIONBroadcast video is used for using part downlink frequency point resource in C DOCSIS systems.In the networking of application optical line terminal, the attributes of network that INVENTIONBroadcast video can make full use of optical line terminal point-to-multipoint is transmitted using multicast, saves bandwidth.

Description

A kind of method and device of the INVENTIONBroadcast video IPization based on C-DOCSIS systems

Technical field

The present invention relates to a kind of method of the communications field more particularly to INVENTIONBroadcast video IPization based on C-DOCSIS systems and Device.

Background technology

Currently, the INVENTIONBroadcast video business of broadcast TV market is based primarily upon HFC (Hybrid Fiber Coaxial mixed lights Fine coaxial electric cable network) real-time performance.Vision signal is turned after the QAM (quadrature amplitude modulation) of front end system modulation by electric light It changes, optical node is transmitted to through light-emitting device, after the photoreceiver of optical node carries out opto-electronic conversion to optical signal, then by wired electricity Depending on signal each user terminal is transmitted to by coaxial cable.The signal transmitted in hfc plant is analog signal.Based on HFC Usually by DOCSIS, (Data Over Cable Service Interface Specifications have for the data service of network Line data over cable service interface specifications (docs is)) system is realized, include CMTS (the Cable Modem Terminal positioned at headend room Systems Cable Modem Terminal Systems) system and Cable Modem (the i.e. CM cables modulatedemodulates positioned at subscriber household Adjust device) equipment and set-top box STB (Set Top Box) (acquiescence is internally integrated CM).

Typical HFC group-network constructions are as shown in Figure 1.In traditional HFC group-network constructions, DOCSIS technical systems are utilized CMTS systems and cm device, using ITU-T J.122, the protocol architectures such as J.222, can realize the broadband number based on hfc plant According to transmission.

China deploys DOCSIS systems in part big and medium-sized cities, for developing two-way services.The integration of three networks be by The three big network such as cable television network, telecommunications network and computer network mutually merges, and realizes and interconnects in network layer, seamless to cover Lid, interpenetrates and is intersected on operation layer, tends to use unified IP agreement in application layer, and wide, Yi Wei is adapted to be formed The multimedia basics platform of the high-speed wideband of shield, low expense.Under integration of three networks background, Broadcasting Cable Network needs to support traditional broadcast type electricity Depending on business, the data service of interactive television services and data class and communication service of voice class etc..It is each preferably to meet The demand of kind of business development, the digitlization of CHINA RFTCOM Co Ltd and IPization seem extremely important, some radio and TV operators are or just In the CHINA RFTCOM Co Ltd for considering the full IPization of construction.The important technical characteristic of the integration of three networks is that various new business are all assisted using IP as carrying View, multi-service fusion is framed in IP agreement, therefore as the broadcasting and television network of one of integration of three networks basic network, and IPization is also As the inexorable trend of its development.

With the scale operation of integration of three networks business, cable television access network network needs to meet big band width service carrying, tool There is multi-service QoS to ensure, can run, manageable Operational requirements.Traditional CMTS equipment prices are expensive, if using tradition CMTS equipment provides big band width service, needs constantly to divide optical node, reduces user's coverage area, this will certainly cause network The rising of improvement cost.

Therefore, it is coaxial innovatively to propose the edge based on ITU-T J.222 serial protocols for cable TV network operator Broadband access technology, the technology inherit J.122, the technical advantage of J.222 serial protocols (also referred to as DOCSIS access systems), The trend of network development for meeting " light entering and copper back " meets multiple services operation demand.Due to this edge based on J.222 agreement Coaxial access technology is to be proposed by the Broadcast Television network operators of China, therefore the technology is also referred to as C-DOCSIS technologies.

C-DOCSIS access technologies by ITU-T original physical layers for belonging to C-DOCSIS head end processing functions J.222 with The interface of data link layer is displaced downwardly to from branch center computer room from cable television optical node, passes downwardly through radio frequency interface and coaxial cable Distribution network connects, and is connected with aggregation networks upwardly through PON or Ethernet.Networking model after being moved down for interface, C- DOCSIS access technologies need the data and control interface between the function module and module of canonical system again, extend ITU-T J.222 uplink and downlink radio-frequency modulations technology simplifies local channel technology, to ensure with ITU-T J.122, J.222 terminal It while hardware compatibility, can realize that gigabit registers one's residence to building, 100,000,000, carries the integrated services such as video, voice-and-data, have big Band width service carrying, multi-service QoS are ensured, can be runed, manageable ability.

The integration of three networks is mutually to merge the three big network such as cable television network, telecommunications network and computer network, in network layer Realization is interconnected, and seamless coverage interpenetrates and intersected on operation layer, tends to use unified IP in application layer (Internet Protocol) agreement, to which the multimedia basics for forming wide, easy care, low expense the high-speed wideband of adaptation are flat Platform.Under integration of three networks background, Broadcasting Cable Network needs to support traditional broadcast type television services, interactive television services and data class Data service and voice class communication service etc..Preferably to meet the needs of various businesses development, the number of CHINA RFTCOM Co Ltd Change and IPization seems extremely important, some radio and TV operators or are considering to build the CHINA RFTCOM Co Ltd of full IPization.Three nets It is various new business all using IP as bearing protocol to merge important technical characteristic, and multi-service fusion is framed in IP agreement, because This broadcasting and television network as one of integration of three networks basic network, IPization also just become inexorable trend of its development.

As shown in Figure 1, in typical networking, usual video traffic includes program request and INVENTIONBroadcast video by edge QAM modulation Equipment realizes that CMTS only realizes data service and program request signalling.Also some small part operators are for order video industry Business and INVENTIONBroadcast video business use IPization, and CMTS is fully utilized to realize, cancels the QAM modulation in networking.To realize that broadcast regards The high reliability of frequency, operator can use CMTS to realize online and demand (telecommunication) service, and in addition an individual CMTS is realized INVENTIONBroadcast video business, the CMTS are encapsulated video traffic by DOCSIS using static multicast technology defeated toward downlink frequency point modulation Go out.Its group-network construction is as shown in Figure 2.In the above-mentioned networking using CMTS to realize INVENTIONBroadcast video IPization, INVENTIONBroadcast video is realized It can be realized using one with two CMTS of data service access.

C-DOCSIS is initially one of three standards of NGB network access techniques promulgated by SARFT(The State Administration of Radio and Television), later It is absorbed by Cablelabs and becomes a part for DOCSIS standards.C-DOCSIS standards are defined on the basis of based on DOCSIS The distributed system architecture of suitable Chinese market, as shown in Figure 3.

Wherein CMC runs on optical node, the main MAC and PHY layer function for realizing DOCSIS.CMC user sides pass through coaxial Cable is connected with CM, and network side passes through the digital transmission technologies such as digital fiber such as PON, Ethernet and CMC Controller phases Even.CMC Controller mainly realize distributed deployment CMC centralized management and control and the convergence of message, two layers or Three layers of forwarding.CMC Controller are generally by realizations such as optical line terminal, interchanger or routers.

C-DOCSIS systems have many advantages, such as that optical fiber and digital, high bandwidth are inexpensive, this patent mainly describe based on C- DOCSIS systems are come the method for realizing INVENTIONBroadcast video IPization.

In the realization INVENTIONBroadcast video method being generally noted above, needed come the method for realizing live telecast using edge QAM modulation It safeguards edge QAM equipment, in addition needs additional CMTS systems to meet data service, and there is no realize for video traffic IPization cannot meet the long term evolution demand of the integration of three networks.Unify video and data based on the CMTS methods for realizing INVENTIONBroadcast video Business realizes the IPization of all business, can meet the needs of integration of three networks, but pass in the optical fiber of head-end system to optical node Still analog signal transmission is used in defeated, needs to safeguard the devices such as light emitting and light-receiving.

Invention content

The present invention proposes a kind of method and device of the INVENTIONBroadcast video IPization based on C-DOCSIS systems, based on C- High performance complete IP network is built on the basis of DOCSIS systems, realizes broadcasting and TV INVENTIONBroadcast video (i.e. broadcast-type TV or live streaming TV) IPization.

Method provided by the invention is that the distributed structure/architecture based on C-DOCSIS systems realizes INVENTIONBroadcast video IPization, is included in On CMC Controller and CMC when the configuration method and user's switching TV channel of realization INVENTIONBroadcast video static multicast Process flow.

The present invention provides a kind of device of the INVENTIONBroadcast video IPization based on C-DOCSIS systems, and described device includes optical link Terminal, optical fiber, optical splitter, described device further include that several CMC equipment, the CMC equipment pass through in coaxial cable and set-top box The CM set is connected, wherein the optical line terminal receives IP video informations and Internet information；The optical line terminal passes through The optical fiber is connected with the optical splitter；The optical splitter is connected with several CMC equipment respectively；The CMC equipment is located at In the optical node of the optical splitter；The CMC equipment is internally integrated optical network unit for the first line of a couplet；The CMC equipment is set with CM It is standby to be connected with STB equipment；

All INVENTIONBroadcast video multicast groups are added configured with static on the optical line terminal, the optical line terminal is used In these video flowings are sent to each CMC by static multicast, meanwhile, it is that all CMC are configured on optical line terminal One broadcast video transmission template, defined in the template CMC in need forwarding INVENTIONBroadcast video multicast address, and forwarding The down channel collection of these INVENTIONBroadcast videos.

In said program preferably, the optical line terminal is used for the centralized management of service convergence and CMC equipment.

In said program preferably, the MAC and PHY layer function of C-DOCSIS systems described in the CMC integration of equipments are used In the RF interfaces for realizing coaxial side.

In said program preferably, the CMC equipment at least supports 16 down channels.

In said program preferably, the optical line terminal and the optical network unit using EPON, GPON and 10GEPON agreements.

In said program preferably, CM built in the set-top box is DOCSIS3.0CM, support multiple frequency points to receive with And down channel binding.

In said program preferably, the part frequency point is used for data and VoD business, and the other part frequency point is used for Receive INVENTIONBroadcast video.

In said program preferably, the optical line terminal and CMC use static multicast mode to INVENTIONBroadcast video.

Using the method for the INVENTIONBroadcast video IPization of foregoing device, the method for the INVENTIONBroadcast video IPization includes as follows Step：

1) configured on optical line terminal it is static all INVENTIONBroadcast video multicast groups are added, and these video flowings are passed through quiet State multicast is sent to each CMC.Meanwhile being that all CMC configure a broadcast video transmission template on optical line terminal, Defined in the template CMC in need forwarding INVENTIONBroadcast video multicast address, and forward the down channel of these INVENTIONBroadcast videos Collection；

2) when CMC reaches the standard grade, optical line terminal issues broadcast video transmission template configuration to CMC, and CMC is according to configuration hard Part forwarding plane establishes the forwarding logic that INVENTIONBroadcast video multicast flows to down channel；

3) user's switching TV channel is to A；

4) set-top box searches the corresponding multicast address B of the television channel A and initiates IGMP Join B；

5) CM built in the set-top box is by the IGMP Join B message transmissions；

6) the CMC equipment captures the information of the IGMP Join B, and judges whether multicast group B is that INVENTIONBroadcast video is quiet State multicast searches the channel where the multicast group B if the multicast group B is INVENTIONBroadcast video static multicast, and correlation is believed Breath is walked by the CM built in set-top box described in DBC message informings if the multicast group B is not INVENTIONBroadcast video static multicast Other normal multicast flows；

7) cm device adjusts INVENTIONBroadcast video according to the DBC message and receives frequency point collection, receives the data of the multicast B It flows and forwards；

8) set-top box is presented the muticast data transmission of user institute switching channels A to TV or other-end equipment.

As can be seen from the above technical solutions, embodiment provided by the invention may be implemented in C-DOCSIS system platforms All business include the IPization etc. of internet business, VOD service and INVENTIONBroadcast video, meet integration of three networks overall goal, The network of full IPization is suitable for the developments such as the following new business such as OTT.Meanwhile method of the present invention can simplify user group Net reduces network construction and maintenance cost.Whole network does not need optical sender and photoreceiver of transmission of analogue signal etc..

Description of the drawings

Fig. 1 is the typical HFC group-network constructions figure of the prior art；

Fig. 2 is that the CMTS of the prior art is modulated the group-network construction figure of output using static multicast technology；

Fig. 3 is the distributed system architecture of the C-DOCSIS standards of the prior art；

Fig. 4 is the group-network construction schematic diagram based on C-DOCSIS systems of the embodiment of the present invention.

Specific implementation mode

In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects It encloses.

Below in conjunction with attached drawing to the method and dress of the INVENTIONBroadcast video IPization provided by the present invention based on C-DOCSIS systems It sets and is described further.

The INVENTIONBroadcast video IPization method based on C-DOCSIS systems can be realized after INVENTIONBroadcast video IPization, in C- All business of television network broadcast, including data service, speech business and video traffic are realized in DOCSIS systems.

Group-network construction of the present invention based on C-DOCSIS systems is as shown in Figure 4.In networking shown in Fig. 4, light The function that the CMC controllers in C-DOCSIS systems are realized on line terminal realizes service convergence and the centralization pipe of CMC equipment Reason.CMC equipment is located at optical node, is internally integrated ONU for the first line of a couplet, in addition integrates the MAC and PHY layer function of C-DOCSIS systems Realize the RF interfaces of coaxial side.According to C-DOCSIS system requirements, CMC can at least support 16 down channels.Optical link is whole The agreements such as EPON, GPON and 10GEPON may be used between end and ONU.To receive data service and live telecast industry simultaneously Business, CM built in set-top box should be DOCSIS3.0CM, and multifrequency point can be supported to receive and down channel is bound, some of frequency points For data and VoD business, other frequency point is for receiving INVENTIONBroadcast video.

To realize that INVENTIONBroadcast video IPization, optical line terminal receive the INVENTIONBroadcast video section from Video service source from network side Mesh, one IGMP multicast group of each broadcast video program.For improve user's switching channels when efficiency, optical line terminal and CMC uses static multicast mode to INVENTIONBroadcast video.All INVENTIONBroadcast video multicast groups of static addition are configured on optical line terminal, And these video flowings are sent to each CMC by static multicast.Meanwhile being all CMC configurations one on optical line terminal A broadcast video transmission template, defined in the template CMC in need forwarding INVENTIONBroadcast video multicast address, and forward this The down channel collection of a little INVENTIONBroadcast videos.When CMC reaches the standard grade, optical line terminal issues broadcast video transmission template configuration to CMC, CMC establishes the forwarding logic that INVENTIONBroadcast video multicast flows to down channel according to configuration in hardware forwarding plane.

Based on the device of above-mentioned INVENTIONBroadcast video IPization, when user watches live telecast or switching channels, corresponding broadcast The step of video IPization method, is as follows：

1) user's switching TV channel is to A；

2) set-top box searches the corresponding multicast address B of television channel A and initiates IGMP Join B；

3) CM built in set-top box is by IGMP Join transparent transmissions；

4) CMC captures IGMP Join B information, judges whether multicast group B is INVENTIONBroadcast video static multicast, is then searched in this way Relevant information is passed through CM built in DBC message informing set-top boxes by the channel where it；

5) CM adjusts INVENTIONBroadcast video according to DBC message and receives frequency point collection, receives the data flow of multicast B and forwarding；

6) set-top box is presented the muticast data transmission of user institute switching channels A to TV or other-end；

Based on the above configuration and flow, radio and TV operator can not only be based on C-DOCSIS distributed systems and realize data industry Business, can also realize INVENTIONBroadcast video business.Optical line terminal described in above method may be integrated CMC Connection between the interchanger or router, with CMC of Controller can be fiber optic Ethernet.

The key point of the present invention is that the distributed structure/architecture based on C-DOCSIS systems realizes INVENTIONBroadcast video IPization, is included in On CMC Controller and CMC when the configuration method and user's switching TV channel of realization INVENTIONBroadcast video static multicast Process flow.

It may be implemented all business in C-DOCSIS system platforms, including internet business, VOD service and wide The IPization etc. for broadcasting video, meets integration of three networks overall goal, and the network of full IPization is suitable for the following new business such as OTT etc. and opens Exhibition.Meanwhile method of the present invention can simplify user networking, reduce network construction and maintenance cost.Whole network does not need Optical sender and photoreceiver of transmission of analogue signal etc..

Realize that INVENTIONBroadcast video IPization can make full use of the big bandwidth characteristic of CMC equipment, utilize in C-DOCSIS systems Part downlink frequency point resource is used for the transmission of INVENTIONBroadcast video.In the networking of application optical line terminal, transmitted using multicast wide The attributes of network that video can make full use of optical line terminal point-to-multipoint is broadcast, bandwidth is saved.

In several embodiments provided herein, it should be understood that disclosed system, device and method can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit It closes or communicates to connect, can be electrical, machinery or other forms.

The unit illustrated as separating component may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme 's.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.

If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words It embodies, which is stored in a storage medium, including some instructions are used so that a computer Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention Portion or part steps.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey The medium of sequence code.

Term " first ", " second ", " third " " in description and claims of this specification and above-mentioned attached drawing The (if present)s such as four " are for distinguishing similar object, without being used to describe specific sequence or precedence.It should manage The data that solution uses in this way can be interchanged in the appropriate case, so that the embodiments described herein can be in addition to illustrating herein Or the sequence other than the content of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that Cover it is non-exclusive include, for example, containing the process of series of steps or unit, method, system, product or equipment need not limit In those of clearly listing step or unit, but may include not listing clearly or for these processes, method, production The intrinsic other steps of product or equipment or unit.

The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before Stating embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these Modification or replacement, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.

Claims (9)

1. a kind of device of the INVENTIONBroadcast video IPization based on C-DOCSIS systems, described device includes optical line terminal, optical fiber, divides Light device, which is characterized in that described device further includes that several CMC equipment, the CMC equipment pass through built in coaxial cable and set-top box CM be connected,

Wherein, the optical line terminal receives IP video informations and Internet information；

The optical line terminal is connected by the optical fiber with the optical splitter；

The optical splitter is connected with several CMC equipment respectively；The CMC equipment is located in the optical node of the optical splitter；

The CMC equipment is internally integrated optical network unit for the first line of a couplet；

The CMC equipment is connected with cm device and STB equipment；

All INVENTIONBroadcast video multicast groups are added configured with static on the optical line terminal, the optical line terminal is used for will These video flowings are sent to each CMC by static multicast, meanwhile, it is there are one all CMC configurations on optical line terminal Broadcast video transmission template, defined in the template CMC in need forwarding INVENTIONBroadcast video multicast address, and forward these The down channel collection of INVENTIONBroadcast video.

2. the device of INVENTIONBroadcast video IPization as described in claim 1, which is characterized in that the optical line terminal is used for service convergence With the centralized management of CMC equipment.

3. the device of INVENTIONBroadcast video IPization as described in claim 1, which is characterized in that C- described in the CMC integration of equipments The MAC and PHY layer function of DOCSIS systems, for realizing the RF interfaces of coaxial side.

4. the device of INVENTIONBroadcast video IPization as claimed in claim 3, which is characterized in that the CMC equipment is at least supported under 16 Row channel.

5. the device of INVENTIONBroadcast video IPization as described in claim 1, which is characterized in that the optical line terminal and the optical-fiber network Unit uses EPON, GPON and 10GEPON agreement.

6. the device of INVENTIONBroadcast video IPization as described in claim 1, which is characterized in that the CM built in the set-top box is DOCSIS3.0CM supports that multiple frequency points receive and down channel is bound.

7. the device of INVENTIONBroadcast video IPization as claimed in claim 6, which is characterized in that part frequency point is used for data and VoD business, Other part frequency point is for receiving INVENTIONBroadcast video.

8. the device of INVENTIONBroadcast video IPization as described in claim 1, which is characterized in that the optical line terminal and CMC are to broadcast Video uses static multicast mode.

9. the method for the INVENTIONBroadcast video IPization using device described in claim 1, which is characterized in that the INVENTIONBroadcast video IPization Method include the following steps：

1) all INVENTIONBroadcast video multicast groups of static addition are configured on optical line terminal, and these video flowings are passed through into static group It broadcasts and gives each CMC, meanwhile, it is that all CMC configure a broadcast video transmission template on optical line terminal, in the mould Defined in plate CMC in need forwarding INVENTIONBroadcast video multicast address, and forward the down channel collection of these INVENTIONBroadcast videos；

2) when CMC reaches the standard grade, optical line terminal issues broadcast video transmission template configuration and is turned to CMC, CMC in hardware according to configuration Hair level establishes the forwarding logic that INVENTIONBroadcast video multicast flows to down channel；

3) user's switching TV channel is to A；

4) set-top box searches the corresponding multicast address B of the television channel A and initiates IGMP Join B；

5) CM built in the set-top box is by the IGMP Join B transparent transmissions；

6) the CMC equipment captures the information of the IGMP Join B, and judges whether multicast group B is INVENTIONBroadcast video static group It broadcasts, if the multicast group B is INVENTIONBroadcast video static multicast, searches the channel where the multicast group B, relevant information is led to Cross the CM built in set-top box described in DBC message informings；

7) cm device adjusts INVENTIONBroadcast video according to the DBC message and receives frequency point collection, receives the data flow of the multicast B simultaneously Forwarding；

8) set-top box is presented the muticast data transmission of user institute switching channels A to TV or other-end equipment.