CN105100888B - A kind of method that IPTV channel switch based on OLT device accelerates - Google Patents
A kind of method that IPTV channel switch based on OLT device accelerates Download PDFInfo
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- CN105100888B CN105100888B CN201510424512.5A CN201510424512A CN105100888B CN 105100888 B CN105100888 B CN 105100888B CN 201510424512 A CN201510424512 A CN 201510424512A CN 105100888 B CN105100888 B CN 105100888B
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- 238000012423 maintenance Methods 0.000 abstract description 4
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4383—Accessing a communication channel
- H04N21/4384—Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
- H04N21/23106—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/64—Addressing
- H04N21/6405—Multicasting
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention provides a kind of method that IPTV channel switch based on OLT device accelerates, including step：The OLT device subscribes to all channels and caches the unicast video stream of each channel；User sends multicast to the OLT device by set top box and leaves request and multicast addition request, and the OLT device push unicast video flow to the set top box, and the multicast is left into request and multicast addition request and is forwarded to multicast router；The multicast router sends multicast video streams by the OLT device to the set top box.Invention also reduces corresponding maintenance cost using the OLT expensive PC server of local cache fictitious hosts and the corresponding network equipment while reducing equipment investment.
Description
Technical field
The present invention relates to communication technical field, more particularly to the method for the IPTV channel switch acceleration based on OLT device.
Background technology
It is relatively slow during IPTV (IPTV) channel switch compared with traditional cable television.
For user through the switching of traditional custom cable television fast channel, they certainly will also it is expected IPTV channel switch speed with passing
TV unite quite or even faster.Under normal circumstances, spectators' acceptable channel change delay time should be less than 1 second within.
In IPTV, Video coding provides 3 main frames：I, B, P.Wherein influenceing the principal element of channel switch is
I frames.Decoder, which must receive I frames, could start to decode.Picture between two I frames is called GOP, and GOP length is to video
The size of code stream influences very big.As shown in table 1, it is the factor and the relation of time delay for influenceing time of switching channels.
Table 1 influences the factor and the relation of time delay of time of switching channels
| Influence the factor of time of switching channels | The typical delay time |
| Leave multicast | 10-50 milliseconds |
| Cut off former multicast data flow | 10-150 milliseconds |
| Add new multicast | 10-50 milliseconds |
| Buffering area is filled | 150-200 milliseconds |
| I frame delay | 500 milliseconds -5 seconds |
Influence channel switch speed as seen from the above table is I frame delay, next to that the filling of buffering area, is finally multicast group
Leave and add.
It generally can realize that channel is switched fast by adding cache equipment, and time of switching channels can be reduced
By about 1 second or so.Its system principle is as follows：
A. by increasing cache device IP TV PoP servers on convergence net to cache all channel streams；
B. set top box STB initiates channel switch, and request stops original multicast data flow, the I of the channel new to cache device requests
The stream that frame starts；
C.Cache equipment quickly sends new channel stream with mode of unicast to set top box；
D. the normal multicast data flow of set-top box requests；
E.Cache stops sending unicast stream.
In the prior art, the extra network equipment and PC server need to be increased, that is just meaned for operator is extra
Investment and maintenance cost, when user is continuously increased, corresponding equipment also to be increased and dilatation.Access network and convergence net
Need to reserve unicast bandwidth for channel switch, it usually needs reserved 40% or so bandwidth ensures channel switch and video point
Broadcast.Multicast data flow need to be become unicast stream during channel switch, network traffics greatly increase.If 200 channels, wherein SDTV
(2M) accounts for 60%, HDTV (8M) and accounts for 40%, and average each channel flow is 4.4M.In the case where single OLT is 2000 user situations, if
There is 20% user in switching channels, then the added flow for just having 1.76G produces, in the feelings that HD video is increasingly popularized
Condition, these flows can more be doubled and redoubled.
The content of the invention
In view of the above problems, the application describes a kind of method that IPTV channel switch based on OLT device accelerates, including
Step：
The OLT device subscribes to all channels and caches the unicast video stream of each channel；
User sends multicast to the OLT device by set top box and leaves request and multicast addition request, the OLT device
Push unicast video flow to the set top box, and the multicast is left into request and multicast addition request and is forwarded to multicast path
By device；
The multicast router receives the multicast and leaves request and multicast addition request, and is set by the OLT
It is standby to send the corresponding multicast video streams of the multicast addition request to the set top box.
Preferably, subscribe to all channel in OLT device described in step and cache in the unicast video stream of each channel also
Including step：
Inquire about the video multicast data of all channels；
When the video multicast data update, the multicast address of the video multicast data of renewal is extracted, and find out
Unicast video stream address corresponding to channel where the video multicast data of renewal；
Calculate the address of the last frame of the unicast video stream；
By in the last frame of the video multicast data copy to the unicast data stream.
Preferably, when by the last frame of the video multicast data copy to the unicast data stream, described in deletion
First frame of unicast data stream, and remaining frame is moved to corresponding former frame address；Return to step is inquired about afterwards
The video multicast data of all channels.
Preferably, being flow in OLT device push unicast video described in step in the set top box also includes step：
OLT device receives the multicast that the set top box is sent and adds request；
The unicast video stream address according to corresponding to the multicast adds the request lookup multicast addition request；
Search the first frame of the unicast video stream；
First frame is copied, first frame is transferred to the set top box；
Update the first frame of the unicast video stream.
Preferably, first frame is copied by way of direct memory access.
Preferably, the first frame that the step updates the unicast video stream specifically includes step：
First frame is deleted after being copied to first frame, and by where remaining frame to corresponding former frame
Move address.
Preferably, also include step after step updates the first frame of the unicast video stream：
Judge whether the unicast video flow data is sent, if finished, terminate；Otherwise, perform step and search institute
State the first frame of unicast video stream.
Preferably, proxy server detects, the multicast leaves request and the multicast adds request, and by described group
Broadcast to leave and ask to be transferred to the OLT device with multicast addition request.
Preferably, the OLT device is provided with PON mouths, the OLT device pushes the unicast by the PON mouths and regarded
Frequency flows.
Present invention also offers the device that a kind of IPTV channel switch based on OLT device accelerates, including OLT device, institute
Stating OLT device includes：
Cache module, to subscribe to all channels and cache the unicast video stream of each channel；
Transport module, it is connected with the cache module, flow to set top box to push unicast video, and multicast is left and asked
Summation multicast adds request and is forwarded to multicast router.
Preferably, the cache module includes：
Query unit, inquire about the video multicast data of all channels；
First address lookup unit, is connected with the query unit, when the video multicast data update, to extract
The multicast address of the video multicast data of renewal, and find out single corresponding to the video multicast data place channel of renewal
Broadcast video flowing address；
Address calculation, it is connected with the first address lookup unit, to calculate the unicast video stream most
The address of frame afterwards；
First copy cell, it is connected respectively with the first address lookup unit and the address calculation, to incite somebody to action
The video multicast data copy is into the last frame of the unicast data stream.
Preferably, the transport module includes：
Receiving unit, receive the multicast and leave request and multicast addition request；
Second address lookup unit, is connected with the receiving unit, described in adding request lookup according to the multicast
Multicast adds the unicast video stream address corresponding to request；
First frame searching unit, it is connected with the second address lookup unit, searches the first frame of the unicast video stream；
Second copy cell, it is connected with the first frame searching unit, to be copied to first frame, and by institute
State the first frame and be transferred to the set top box；
Updating block, it is connected with the first frame searching unit, to update the first frame of the unicast video stream.
Preferably, the IPTV channel switch accelerator also includes：
Set top box, it is connected with the receiving unit and second copy cell, to send institute to the receiving unit
State multicast and leave request and multicast addition request, and receive first frame that the second copy cell transmission comes；
Multicast router, it is connected with the receiving unit, to receive, the multicast leaves request and the multicast adds
Request, and the multicast is sent to the set top box by the OLT device and adds the corresponding multicast video streams of request.
Above-mentioned technical proposal has the following advantages that or beneficial effect：The present invention is held high using OLT local cache fictitious hosts
Expensive PC server and the corresponding network equipment, corresponding maintenance cost is also reduced while reducing equipment investment；This hair
Bright cost is cheap, only need to be according to corresponding application, OLT increase cachings；Cache size can be according to event application scene, can
With from several G to tens G, it might even be possible to which introducing SSD hard disks makes spatial cache be upgraded to T ranks；Cut with traditional fast channel
The technology of changing is compared, and unicast push can significantly save the bandwidth resources of convergence net closer to user, while pushing speed is also more
It hurry up；Adjusted using dynamic bandwidth, accelerate the push time of unicast data.
Brief description of the drawings
With reference to appended accompanying drawing, more fully to describe embodiments of the invention.However, appended accompanying drawing be merely to illustrate and
Illustrate, and be not meant to limit the scope of the invention.
Fig. 1 is a kind of structural representation of the IPTV channel switch accelerators based on OLT of the present invention；
Fig. 2 is a kind of use state diagram of the IPTV channel switch accelerators based on OLT of the present invention；
Fig. 3 is a kind of flow chart one of the IPTV channel switch accelerated methods based on OLT of the present invention；
Fig. 4 is a kind of flowchart 2 of the IPTV channel switch accelerated methods based on OLT of the present invention.
Embodiment
The method accelerated below in conjunction with the accompanying drawings with specific embodiment to the IPTV channel switch based on OLT device of the present invention
It is described in detail.
A kind of as shown in figure 1, IPTV channel switch for being based on OLT (Optical Line Terminal, optical line terminal)
The method of acceleration, including step：
OLT device subscribes to all channels and caches the unicast video stream of each channel；
User sends multicast to OLT device by set top box and leaves request and multicast addition request, and OLT device push is corresponding
Unicast video stream to set top box, and by multicast leave request and multicast add request be forwarded to multicast router；
The multicast router sends multicast video streams by the OLT device to the set top box.
Specifically, first have to subscribe to all channels with OLT device and cache the video flowing of each channel, this way
The unicast data cached can directly pushed by user's progress and when containing channel, without adding PC server in convergence-level
Deng buffer memory device.When user needs switching channels, when such as switching to channel 2 from channel 1, sent out by set top box to OLT device
The multicast for going out to leave channel 1 leaves request and adds the multicast addition request of channel 2, and OLT receives the multicast and adds request, from
2 corresponding unicast video stream of channel is searched in OLT local cache, and the unicast video stream is transferred to set top box.In addition, group
Broadcast and leave request and multicast adds request and is also transmitted to multicast router by OLT device, multicast router by OLT device to
Set top box sends the multicast video streams of channel 2.This method merely with OLT device and in the case of not needing other buffer memory devices,
Quickly realize the switching of channel.
When OLT device subscribes to all channels and caches the video flowing of each channel, OLT static can subscribe to all
Multicast channel, then it is buffered in local cache, video data length was at 10 seconds or so.If as shown in Fig. 2 with 200 frequencies
Exemplified by road, wherein SDTV (2M) accounts for 60%, HDTV (8M) and accounts for 40%, and average each channel flow is 4.4M, then OLT device is only
1.1GB space is needed to be used as caching.As shown in figure 3, specifically, including step：
S11：Processor inquires about the video multicast data of all channels；
S12：Judge whether video multicast data update, if performing S13, otherwise return to S11；
S13：The multicast address of the video multicast data is extracted, and looks for channel where the video multicast data of renewal
Corresponding unicast video stream；
S14：Calculate the address of last frame；
S15：Video multicast data are copied by way of DMA (direct memory access) to the last frame of unicast video stream
In.
When OLT device subscribes to all channels and caches the unicast video flow data of each channel, first inquired about by processor
Whether the video data of each channel is in the presence of updating, and when it is present, the corresponding channel in surface reports program, then
The unicast video data of the channel in the local cache to OLT device is just needed to be updated processing.Extracting should in local cache
The multicast address of channel, search the video data frame in the multicast address and calculate the address of last frame, it is real by way of DMA
When the last frame that video multicast data are constantly copied to unicast video stream in, and in the unicast video stream before
All frames also constantly move to its corresponding former frame.This mode can in real time by the unicast video stream of each channel when
Between be stored in the local cache of OLT device, and realize the real-time update to unicast video stream.When for needing to carry out channel
During switching, it becomes possible to newest unicast video stream is transferred from the local cache of OLT device, ensure that video quality.Wherein, institute
Stating the local cache size of OLT device can apply from several G to tens G more accordingly, it might even be possible to introduce SSD hard disks
Spatial cache is set to be upgraded to T ranks.
As shown in figure 4, when OLT device pushes corresponding unicast video stream to set top box, step is specifically included：
S21：OLT device receives the multicast that the set top box is sent and adds request；
S22：Request is added according to the multicast and searches required unicast video flow data address；
S23：Search the first frame of the unicast video flow data；
S24：Copied by way of DMA (direct memory access), by the unicast video stream data transfer to institute
State set top box；
S25：Update the first frame of the unicast video flow data；
S26：Judge whether the unicast video flow data is sent, if it is, terminating, otherwise, perform S23.
In this step, after OLT device receives the multicast addition request that set top box is sent, machine is judged according to the request
Address of the unicast video stream data storage of the top box channel to be switched in local cache, and search the unicast video fluxion
According to the first frame, and the first frame information is copied by way of DMA and is transferred to set top box, be issued to by set top box
User.In this process, it is also necessary to constantly the first frame of unicast video flow data is updated, i.e., when the first frame is copied
Afterwards, frame below moves to former frame address successively.When the last frame for detecting the unicast video stream has been copied
Bei Hou, terminate the whole process that unicast video flows to set top box transmission.
In addition, OLT also monitors the multicast packet of all users by IGMP proxy (proxy server).When user cuts
When changing channel, the proxy server can detect user and leave multicast and add the message of multicast, i.e., described agency service
Device can receive the multicast and leave request and multicast addition request.This mode causes when carrying out channel switch, without etc.
Treat that the message of multicast router is corresponding, directly acted on behalf of by OLT and complete whole flow process, accelerate the speed that user exited and added multicast
Degree, and unicast data stream can be pushed out in the very first time.
If when the channel of user's switching is 8M high definition channels, the client for possessing 10M network bandwidths, normal conditions
The GOP frames of the lower OLT device push unicast video stream have 500 milliseconds to 5 seconds of typical delay time.In order to reduce this
Delay, the OLT device are provided with PON mouths, and by using the DBA (adjustment of dynamic broadband) of PON mouths, dynamic improves IPTV data
The broadband of stream, so as to improve promotion speed, reduce and promote the time.As shown in table 2, it is to push broadband using after PON mouths and prolong
Slow relation.
Table 2 utilizes the relation that broadband and delay are pushed after PON mouths
| Push bandwidth | Delay |
| 8Mbsp | The 0.5-5 seconds |
| 16Mbsp | The 0.25-2.5 seconds |
| 32Mbps | The 0.125-1.25 seconds |
| 64Mbps | <1 second |
As can be seen from the table, the lifting of bandwidth can effectively reduce the time delay of GoP frames.In distribution bandwidth more significantly
When, postpone accordingly smaller, the time of push is also shorter, and the corresponding time for taking public resource is also shorter.
In summary, the present invention utilizes the OLT expensive PC server of local cache fictitious hosts and corresponding network
Equipment, corresponding maintenance cost is also reduced while reducing equipment investment.The cost of the present invention is cheap, only need to be according to corresponding
Application, OLT increase caching.Cache size can be according to event application scene, can be from several G to tens G, it might even be possible to
Introducing SSD hard disks makes spatial cache be upgraded to T ranks；Compared with traditional fast channel handoff technique, unicast push is closer to be used
Family.The bandwidth resources of convergence net can be significantly saved, while pushing speed is also faster；Adjusted using dynamic bandwidth, accelerate unicast
The push time of data.
As shown in figure 1, present invention also offers the equipment that a kind of IPTV channel switch based on OLT device accelerates, including
Set top box, OLT device and the multicast router being sequentially connected：
Set top box, user send multicast to the OLT device by the set top box and leave request and multicast addition request,
And receive unicast video stream and multicast video streams that the OLT device transmission comes；
OLT device, it is connected respectively with the set top box and the multicast router, reception multicast leaves request and multicast adds
Enter request, be transferred to for caching the unicast video stream of all channels, and by the multicast video streams that the set top box transmission comes
The set top box；
Multicast router, it is connected with the OLT device, for sending multicast video streams to OLT device.
Wherein, the OLT device includes：
Cache module, to subscribe to all channels and cache the unicast video stream of each channel；
Transport module, it is connected with the cache module, flow to set top box to push unicast video, and multicast is left and asked
Summation multicast adds request and is forwarded to multicast router.
The cache module includes：
Query unit, inquire about the video multicast data of all channels；
First address lookup unit, is connected with the query unit, when the video multicast data update, to extract
The multicast address of the video multicast data of renewal, and find out single corresponding to the video multicast data place channel of renewal
Broadcast video flowing address；
Address calculation, it is connected with the first address lookup unit, to calculate the unicast video stream most
The address of frame afterwards；
First copy cell, it is connected respectively with the first address lookup unit and the address calculation, to incite somebody to action
The video multicast data copy is into the last frame of the unicast data stream.
The transport module includes：
Receiving unit, receive the multicast and leave request and multicast addition request；
Second address lookup unit, is connected with the receiving unit, described in adding request lookup according to the multicast
Multicast adds the unicast video stream address corresponding to request；
First frame searching unit, it is connected with the second address lookup unit, searches the first frame of the unicast video stream；
Second copy cell, it is connected with the first frame searching unit, to be copied to first frame, and by institute
State the first frame and be transferred to the set top box；
Updating block, it is connected with the first frame searching unit, to update the first frame of the unicast video stream.
For a person skilled in the art, after reading described above, various changes and modifications undoubtedly will be evident.
Therefore, appended claims should regard whole variations and modifications of the true intention and scope that cover the present invention as.Weighing
Any and all scope and content of equal value, are all considered as still belonging to the intent and scope of the invention in the range of sharp claim.
Claims (10)
1. a kind of method that IPTV channel switch based on OLT device accelerates, it is characterised in that including step：The OLT device
Subscribe to all channels and cache the unicast video stream of each channel；
User sends multicast to the OLT device by set top box and leaves request and multicast addition request, the OLT device push
Unicast video flow to the set top box, and the multicast is left into request and multicast addition request and is forwarded to Multicast Routing
Device；
The multicast router receives that the multicast leaves request and the multicast adds request, and by the OLT device to
The set top box sends the multicast and adds the corresponding multicast video streams of request；
Being flow in OLT device push unicast video described in step in the set top box also includes：
OLT device receives the multicast that the set top box is sent and adds request；
The unicast video stream address according to corresponding to the multicast adds the request lookup multicast addition request；Search
First frame of the unicast video stream；
First frame is copied, first frame is transferred to the set top box；
Update the first frame of the unicast video stream；
Proxy server detect the multicast leave request and the multicast add request, and by the multicast leave request and
The multicast adds request and is transferred to the OLT device.
2. the method that the IPTV channel switch according to claim 1 based on OLT device accelerates, it is characterised in that in step
The rapid OLT device is subscribed to all channels and cached also to be included in the unicast video stream of each channel：
Inquire about the video multicast data of all channels；
When the video multicast data update, the multicast address of the video multicast data of renewal is extracted, and find out renewal
The video multicast data where unicast video stream address corresponding to channel；
Calculate the address of the last frame of the unicast video stream；
By in the last frame of the video multicast data copy to the unicast data stream.
3. the method that the IPTV channel switch according to claim 2 based on OLT device accelerates, it is characterised in that inciting somebody to action
When the video multicast data copy is into the last frame of the unicast data stream, the first frame of the unicast data stream is deleted,
And remaining frame is moved to corresponding former frame address；Return to step inquires about the video multicast number of all channels afterwards
According to.
4. the method that the IPTV channel switch according to claim 1 based on OLT device accelerates, it is characterised in that pass through
The mode of direct memory access copies to first frame.
5. the method that the IPTV channel switch according to claim 1 based on OLT device accelerates, it is characterised in that described
The first frame that step updates the unicast video stream specifically includes：
Delete first frame after being copied to first frame, and by remaining frame to corresponding former frame address
It is mobile.
6. the method that the IPTV channel switch according to claim 1 based on OLT device accelerates, it is characterised in that in step
Suddenly also include after updating the first frame of the unicast video stream：
Judge whether the unicast video flow data is sent, if finished, terminate；Otherwise, perform step and search the list
Broadcast the first frame of video flowing.
7. the method that the IPTV channel switch according to claim 1 based on OLT device accelerates, it is characterised in that described
OLT device is provided with PON mouths, and the OLT device pushes the unicast video stream by the PON mouths.
A kind of 8. device that IPTV channel switch based on OLT device accelerates, it is characterised in that including OLT device, the OLT
Equipment includes：
Cache module, to subscribe to all channels and cache the unicast video stream of each channel；
Transport module, be connected with the cache module, set top box flow to push unicast video, and by multicast leave request and
Multicast adds request and is forwarded to multicast router；
Receiving unit, receive the multicast and leave request and multicast addition request；
Second address lookup unit, is connected with the receiving unit, and the multicast is searched to add request according to the multicast
Add the unicast video stream address corresponding to request；
First frame searching unit, it is connected with the second address lookup unit, searches the first frame of the unicast video stream；Second
Copy cell, it is connected with the first frame searching unit, to be copied to first frame, and by the first frame transmission
To the set top box；
Updating block, it is connected with the first frame searching unit, to update the first frame of the unicast video stream；Agency service
Device detects the multicast and leaves request and multicast addition request, and the multicast is left into request and multicast addition
Request is transferred to the OLT device.
9. the device that the IPTV channel switch according to claim 8 based on OLT device accelerates, it is characterised in that described
Cache module includes：
Query unit, inquire about the video multicast data of all channels；
First address lookup unit, is connected with the query unit, to when the video multicast data update, extraction updates
The video multicast data multicast address, and unicast corresponding to channel where finding out the video multicast data of renewal regards
Frequency stream address；
Address calculation, it is connected with the first address lookup unit, to calculate the last frame of the unicast video stream
Address；
First copy cell, it is connected respectively with the first address lookup unit and the address calculation, to by described in
Video multicast data copy is into the last frame of the unicast data stream.
10. the IPTV channel switch accelerators according to claim 8 based on OLT device, it is characterised in that described
IPTV channel switch accelerators also include：
Set top box, it is connected with the receiving unit and second copy cell, to send described group to the receiving unit
Broadcast and leave request and multicast addition request, and receive first frame that the second copy cell transmission comes；
Multicast router, it is connected with the receiving unit, request and multicast addition request is left to receive the multicast,
And the multicast is sent to the set top box by the OLT device and adds the corresponding multicast video streams of request.
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| Application Number | Priority Date | Filing Date | Title |
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