CN101207473B - Method for multicast implementation of switch-in layer network in IPTV system - Google Patents
Method for multicast implementation of switch-in layer network in IPTV system Download PDFInfo
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Abstract
The invention discloses a method which can ensure an access layer network in an IPTV system to implement multicast. The method includes the steps that a DSLAM acquires the password information of a set-top box account, and transmits the password information to BRAS for authentication judgment, the BRAS is connected with the DSLAM through the set-top box; when the user requests a certain media flow information in the IPTV operation, the set-top box sends request information to the DSLAM, and transmits the request information to the BRAS; the BRAS captures the request information and judges; when the BRAS responds allowance to join, the DSLAM judges whether the address is contained in the received multicast code flow; when being not, a broadband router sends the request information to an aggregation layer network, the aggregation layer network sends a corresponding multicast group to the broadband router, and a broadband transmits the multicast group to the DSLAM, the DSLAM duplicates the multicast group; a port number connected by the set-top box establishes a correspondence relationship with the multicast group, and sends the multicast code flow to the set-top box for decoding and playing. The invention solves the technical weakness of realizing access layer network multicast by a PPPoE method or a DHCP method on the basis of BRAS.
Description
Technical field
The present invention relates to IPTV (IPTV) service bearer network, relate in particular to the method that access layer network in a kind of IPTV system is realized multicast.
Background technology
According to " IPTV of China Telecom business norms " definition, the IPTV business comprises that mainly program request, broadcasting, recreation, information service, broadcast program subscription (PVR), communication service, long-distance education, music/Karaoke, interactive advertisement, set-top box surf the web etc.According to the feature operation characteristics, business can be divided into 4 classes: communication service class, streaming media service class, game services class and information service class.
The communication service class comprises video communication and note.The IPTV video communication provides based on China Telecom's public video business, and provides the service that integrates video, audio frequency and data to the user by China Telecom's public video net.The IPTV set-top box only as a terminal of public video business, inserts the public video net by the Internet, the various functions of using the public video net to provide.
The streaming media service class is divided into point-to-point broadcast and point-to-multipoint is play two kinds.
Program request, PVR, long-distance education, music/Karaoke are that unique user carries out the audio/video flow broadcast on demand, are a kind of point-to-point broadcasts.The point-to-point play service of IPTV provides based on China Telecom's content-delivery network (CDN), programme content should be pushed to the network terminal near the user as far as possible, set-top box is visited CDN (Content Distribution Network nearby by broadband networks, content distributing network) node is to improve professional service quality.
Broadcasting is the service of program source while to the identical audio/video flow of a plurality of user's active push, is a kind of point-to-multipoint broadcast mode.The IPTV broadcasting service is fit to adopt the multicast mode to provide service to the user.Programme content is pushed to the multicast server of serving to the user by CDN or data network, provides to the user by the multicast mode again.
Recreation comprises single-play game and internet game.At the business development initial stage, single-play game is divided the recreation of closing use to download segmentation then by scene, does not temporarily develop other single-play game.Internet game requires can be by broadband network with game server or other client connections.
The information service class comprises that information service, interactive advertisement and set-top box surf the web etc.For the set-top box service of surfing the web, the initial stage must be provided for the customer service website that set-top box connects, but does not advise browsing other websites.
IPTV service bearer network mainly makes up based on broadband network.Usually IPTV service bearer network is made up of operation layer, convergence-level and Access Layer three parts.
Operation layer comprises content-delivery network (CDN), Management Layer bearer network, service application layer bearer network, main carrying and control that realizes that concrete each business is correlated with.For example: network of relation and equipment such as information service and game services network.
Convergence-level comprises from SACP equipment (BRAS/AR couple in router) to network of relation and equipment between the operation layer fringe node, mainly realizes the network carrying of each IPTV business inserting from concrete service network to the user.For example: the convergence-level network range can comprise metropolitan area network and backbone network two-level network, or only comprises the metropolitan area network primary network station.
Access Layer is meant network of relation and the equipment (BRAS/AR couple in router) from the subscriber computer top box to SACP, mainly realizes the access of IPTV business.For example: Access Layer is realized by the broadband access network of metropolitan area network.
IP (Internet protocol) multicast is to utilize a kind of agreement that the IP packet is sent to a plurality of destinations from a source, and the copy of information is sent to a group address, sends to arrive all and want to receive its recipient.The IP multicast is the IP packet " to be tried one's best " be transferred to a main frame set that constitutes multicast group, and each member of group can be distributed in each independently on the physical network.Member's relation is dynamic in the IP multicast group, main frame can add and withdraw from group at any time, the member relation of group has determined whether main frame receives the multicast packet of giving this group, is not that member's main frame of certain group also can send multicast packet to this group.Same clean culture (unicast) or broadcasting (broadcast) are compared, and multicast efficient is very high, because any given link is used once at the most, can save the network bandwidth and resource.
According to the above-mentioned IPTV of introduction business is a kind of novel business, and wherein the audio/video flow service is its notable feature.In traditional broadband network, mainly be to make up, be fit to carry out the point-to-point transmission data content at general servicies such as web page browsing, data downloads.The audio/video flow service that the IPTV business provides normally provides up to a hundred fixing audio/video flow contents, use for the set-top box users program request, owing to will guarantee good audio frequency and video result of broadcast, the common web page browsing of bandwidth ratio that the audio/video flow transmission takies, data are downloaded needs more bandwidth, transmit these audio and video data streams if still adopt point-to-point mode, will cause the data flow of a lot of identical contents on same transmission path, to transmit, cause the significant wastage of the network bandwidth, influence the use experience of carrying out of other transmission of broadband network business with the user, usually our data flow broadcast transmission of adopting, because the complexity of whole broadband network, be not suitable for adopting the broadcast transmitted mode, but because the employing of broadcast technology, make the switch on the network, router, main frame will be under the great live load, reduced the operating efficiency of whole network, produced a lot of problems and occur.So the multicast mode is the better mode of audio/video flow transmission, because the characteristics of multicasting technology itself, can make on the transmission link and only propagate one tunnel audio and video data streams, and all need use the set-top box users of video stream data normally to receive, therefore, multicast transmission is the better method that the IPTV business is transmitted on broadband network.
In the existing broadband network technology, convergence-level belongs to backbone network, realizes in backbone network dynamically and static multicast can realize the audio/video flow content is sent to Access Layer from operation layer.And mainly be by BAS Broadband Access Server (BRAS between Access Layer and the convergence-level, Broadband Network Access Server) connects, if Access Layer adopts IP multicast mode, the method that multicast is realized is: carry out multicast control and content replication at access server, because the problem of BAS Broadband Access Server node data disposal ability, can not adapt to large-scale IPTV business carries out, and carry out the IPTV business based on BRAS, only be suitable for the broadband network that PPPoE (PPP over Ethernet) technology inserts, then inapplicable for the broadband network that adopts DHCP (DHCP, Dynamic Host Configuration Protocol) technology to insert.
Summary of the invention
Technical problem to be solved by this invention is to provide access layer network in a kind of IPTV system to realize the method for multicast, adopts PPP over Ethernet or DHCP mode to realize the technical vulnerability problem of access layer network multicast to solve based on BRAS.
In order to address the above problem, the invention provides access layer network in a kind of IPTV system and realize the method for multicast, be applied to the existing multicast of realizing access layer network IPTV business based on the broadband access network system, between convergence-level and Access Layer, be provided with broadband router, the digital subscriber line access server is set between set-top box and BAS Broadband Access Server, digital subscriber line access server and broadband router are that the network of high bandwidth is connected, and may further comprise the steps:
(1) digital subscriber line access server (DSLAM, Digital Subscriber Line Access Multiplexer) get access to the account number cipher information of set-top box after, be transmitted to BAS Broadband Access Server (BRAS, Broadband Network Access Server) carrying out authentication judges, authentication is passed through, and then described set-top box and digital subscriber line access server connect;
(2) when the user asks in the IPTV business medium stream information of certain, described set-top box sends a request message to the digital subscriber line access server, request adds the multicast group of this medium stream information, and described digital subscriber line access server is transmitted to BAS Broadband Access Server with request message;
(3) described BAS Broadband Access Server is intercepted and captured this message, therefrom takes out the multicast group address of request adding, and judges whether this user has the multicast group that authority adds this medium stream information;
(4) if the response message of described BAS Broadband Access Server represents not allow adding, then it abandons this request message, otherwise, described digital subscriber line access server judges in the multicast code stream that has received whether comprise this multicast group address, as not comprising, then described digital subscriber line access server sends this request message to broadband router, described broadband router judges in the multicast code stream that has received whether comprise this multicast group address, as not comprising, then described broadband router sends this request message to the convergence-level network, described convergence-level network sends to described broadband router with the multicast group of correspondence, and is transmitted to described digital subscriber line access server by it;
(5) described digital subscriber line access server duplicates this multicast group information, with port numbers that described set-top box connected therewith multicast group set up corresponding relation, and the connection that described multicast code stream is set up according to described step (1) is sent to the broadcast of decoding of described set-top box.
Method of the present invention, wherein, described step (1) further comprises:
When authentication is not passed through, then do not allow this set-top box and described digital subscriber line access server to connect.
Method of the present invention, wherein, described request message is standard compliant Internet igmpinternet (IGMP) message.
Method of the present invention, wherein, described step (4) further comprises:
Described digital subscriber line access server comprises this multicast group address, then directly in the execution in step (5) with port numbers that described set-top box connected therewith multicast group set up corresponding relation, and the connection that described multicast code stream is set up according to described step (1) is sent to the broadcast of decoding of described set-top box.
Method of the present invention, wherein, described step (4) further comprises:
If described broadband router comprises this multicast group address, then duplicate this multicast group information and give described digital subscriber line access server, and in the execution in step (5) with port numbers that described set-top box connected therewith multicast group set up corresponding relation, and the connection that described multicast code stream is set up according to described step (1) is sent to the broadcast of decoding of described set-top box.
Method of the present invention, wherein, described step (1) further comprises:
Described set-top box reaches and receives the set-top box of handling the multicast code stream for having PPP over Ethernet or DHCP mode;
Described digital subscriber line access server is supported PPP over Ethernet or DHCP mode and management for having, Internet igmpinternet and duplicate and transmit the digital subscriber line access server of multicast code stream;
Said method, wherein, described step (1) further comprises: when described set-top box adopts DHCP mode and digital subscriber line access server to connect, described digital subscriber line access server obtains the request connection message of described set-top box, and distribute implicit IP address to give described set-top box, described set-top box is redirected on the WEB server, get access to the account number cipher information of this set-top box by described WEB server, be transmitted to BAS Broadband Access Server and carry out authentication and judge;
Wherein, the described request connection message is the OPTION60 that carries DHCP definition and the request connection message of OPTION82 field contents.
Method of the present invention, wherein, described step further comprises in (1): described set-top box adopts PPP over Ethernet by ADSL (Asymmetric Digital Subscriber line, Asymmetric Digital Subscriber Loop (ADSL)) the digital subscriber line access server of modulator-demodulator and local side is set up point-to-point protocol (PPP, Point to Point Protocol) link.
Said method, wherein, digital subscriber line access server described in the step (5) is set up the multicast code stream according to described step (1) connection sends, and further comprises: if the peer-peer protocol link that adopts PPP over Ethernet to set up is packed the back to the multicast code stream and sent.
Therefore, multicast mode of the present invention is best suited for the streamed a kind of mode of video, access layer network is realized the method for multicast in a kind of IPTV of the present invention system, be applied to existingly adopt PPP over Ethernet or DHCP mode to realize the multicast of access layer network IPTV business, solved based on BRAS equipment and adopted PPP over Ethernet or DHCP mode to realize the technical vulnerability problem of access layer network multicast based on the broadband access network system.
Description of drawings
Fig. 1 is the described existing broadband access layer network figure of prior art of the present invention;
Fig. 2 is the connection layout that access layer network is realized multicast in the described IPTV of the embodiment of the invention system;
Fig. 3 is the multicast IPTV business process map of the described method of the embodiment of the invention based on PPP over Ethernet;
Fig. 4 is the multicast IPTV business process map of the described method of the embodiment of the invention based on the DHCP mode.
Embodiment
The present invention is in order to solve the drawback that conventional solution exists, further set forth the method that access layer network in a kind of IPTV of the present invention system is realized multicast by following specific embodiment, below embodiment is described in detail, but not as a limitation of the invention.
As shown in Figure 1, the described existing broadband access layer network of prior art of the present invention system comprises: set-top box, ADSL Modem (modem) and BRAS equipment.Wherein BRAS equipment is connected with convergence-level router in the existing broadband network.
In the whole Access Network of existing wide-band cut-in network system, described set-top box adopts Ethernet to link to each other with ADSLmodem, ADSL modem adopts telephone wire to be connected to the BAS Broadband Access Server (BRAS) that is positioned at local side, and set-top box adopts PPP over Ethernet to be dial-up connection to BRAS by ADSL.
Structure and technical characteristic at existing Access Network are varied, and the embodiment of the invention is selected at present typical Access Network bearing structure, and it is realized multicast bear.But, should suit measures to local conditions to choose rational implementation in conjunction with the Access Network situation of locality in Access Layer actual sets wet end administration with in optimizing.In same metropolitan area network, use a kind of implementation as far as possible, if wherein any all can not satisfy consider again when all require that mixed networking realizes.
In conjunction with shown in Figure 2, implementation method of the present invention adopts the mode that increases equipment in access network, between convergence-level and Access Layer, increase a series of common broadband routers, this broadband router has very high bandwidth handling capacity, and support IGMP agreement and PIM agreement (to comprise: PIM-SM (Protocol Independent Multicast-Sparse Mode, Protocol Independent Multicast-Sparse Mode) multicast routing protocol, PIM-DM (Protocol Independent Multicast-Dense Mode, Protocol Independent Multicast-Dense Mode) multicast routing protocol).Increase a series of IPDSLAM equipment between set-top box and BRAS, this equipment is supported IGMP agreement, IGMP Snooping agreement, and supports DHCPRelay Agent function and multicast service controlled function.IP DSLAM equipment exists the network of high bandwidth to be connected with broadband router.
The audio/video flow information of coming from the operation layer of network system, arrive Access Layer by convergence-level, convergence-level adopts the static multicast mode that the audio/video flow information of operation layer issue is sent to Access Layer, Access Layer is connected with convergence-level with BRAS by broadband router, Access Layer adds corresponding multicast group by broadband router and receives audio/video flow information, adopt two layers of Ethernet to be connected between DSLAM equipment and broadband router and the BRAS, wherein, need to support the bigger network bandwidth with the broadband router coupling part, and these layer 2 ethernet switches need be supported IGMP snooping agreement, adopt telephone wire to be connected between DSLAM equipment and the ADSL Modem, the employing Ethernet is connected between set-top box and the ADSLModem.
Particularly, adopt layer 2 ethernet switch group to link to each other between broadband router and the DSLAM, layer 2 ethernet switch all possesses IGMP Snooping protocol function, just can intercept the IGMP bag, and, forming the corresponding a series of switch ports themselves of each multicast address with the port grouping that switch externally connects, Layer 2 switch receives the Media Stream that sends to certain multicast address, can audio/video flow be sent to corresponding port according to the corresponding relation of multicast address and port.Set up the multicast network between the Layer 2 switch.DSLAM links to each other with Layer 2 switch, receives the multicast code stream that Layer 2 switch sends over.BRAS provides the authentication process function, is connected with Layer 2 switch, links to each other with DSLAM by Layer 2 switch.DSLAM is sent to the ADSLModem with authority after the multicast code stream can being duplicated, the broadcast of decoding behind the code stream of set-top box reception ADSL Modem.At two kinds of different access waies of PPPoE and DHCP, the business of Access Network multicast has difference approximately, and roughly flow process is as follows:
1, after set-top box starts, adopt PPP over Ethernet or DHCP protocol mode access network, BRAS equipment is responsible for the account number cipher of set-top box is carried out authentication, forbids inserting for the disabled user;
2, the multimedia address information that provides by the IPTV business of set-top box navigates to the multicast address of Media Stream, and sends IGMP message by ADSL Modem and require to add multicast group;
3, after DSLAM received the IGMP message of set-top box transmission, to BRAS device request authentication, BRAS judged whether this set-top box users has authority and add multicast group;
4, BRAS equipment returns response message, DSLAM judges whether set-top box users has corresponding authority, if do not have authority, then abandon the IGMP request, otherwise the port that DSLAM writes down this set-top box connects and multicast group address information, and to the request of broadband router transmission adding multicast group, this request message adopts IGMP message to send, and this message is intercepted and captured by the Layer 2 switch between broadband router and the DSLAM, and corresponding multicast group port is set;
5, broadband router sends the request message that adds certain multicast group to convergence-level, after broadband router receives the multicast code stream, Layer 2 switch downstream sends, be sent to DSLAM by Layer 2 switch, DSLAM is according to the corresponding relation between multicast group address and the port, be sent to corresponding ports after the multicast code stream duplicated, set-top box receives audio-video code stream information, finishes the multicast service flow process.
In conjunction with shown in Figure 3, the embodiment of the invention is described as follows based on the multicast IPTV operation flow of PPP over Ethernet:
201 steps, set-top box adopt PPP over Ethernet to send PPP link setup request message to DSLAM, wherein comprise the account number cipher information of this set-top box users;
202 steps, DSLAM forms the request authentication message with the account number cipher information of set-top box users and sends to BRAS equipment;
203 steps are returned response message after the BRAS device authentication;
204 steps if the success of set-top box authentication then distributes corresponding IP address by DSLAM to set-top box, allow set-top box to insert, and successfully set up ppp link between set-top box and the DSLAM, otherwise the refusal set-top box inserts;
After 205 steps, set-top box browse to the multicast address of IPTV program stream information, send this multicast group request message of adding, the standard compliant IGMP agreement of this message;
206 steps, DSLAM sends to BRAS equipment and adds the multicast group authentication message, carries this multicast group address and usersaccount information in the message;
207 steps, BRAS equipment adds the request message authentication of this multicast group to set-top box, and returns authenticating result;
208 steps, if the response message of BRAS represents to allow set-top box to insert, then DSLAM abandons this multicast group address message of this adding, otherwise, whether DSLAM searches in the multicast group of having set up is the multicast code stream that has received, if do not receive the code stream of this multicast group, DSLAM sends request to broadband router and adds this multicast group request, and message is followed the IGMP message of standard;
209 steps, the multicast group address that the broadband router inspection has received self is if the multicast code stream that has received then forward step 211 to and continue to carry out, otherwise broadband router sends this multicast group address request of adding to the convergence-level network, continues subsequent step 210;
210 steps, convergence-level sends the multicast code stream to broadband router, and this multicast group address is the multicast group address that the broadband router request receives;
211 steps, broadband router sends the multicast code stream to DSLAM;
212 steps, DSLAM receives the multicast code stream, and DSLAM is packaged into the PPP information bag according to the corresponding relation of multicast address and port with code stream;
213 steps, DSLAM sends the multicast code stream information to set-top box users.
In conjunction with shown in Figure 4, the method for the invention is to utilize some OPTION fields of DHCP definition to realize based on the DHCP mode, as come the identification terminal type by OPTION60, discerns customer location (in fact being exactly the mark user) by OPTITON82.
When the network equipment is received the DHCP request message of set-top box (STB), need behind message, add the OPTION82 field, there are this moment two kinds of patterns to carry out the DHCP authentication, a kind of is directly to give Dynamic Host Configuration Protocol server the DHCP message, judge according to the OPTION82 field whether this user is validated user by Dynamic Host Configuration Protocol server, thereby whether decision is its distributing IP address.Another kind is that the DHCP message is delivered to BRAS equipment earlier, the OPTION82 field is put in the subdomain of RADIUS by BRAS equipment, carries out the user validation authentication by radius server, if the user is legal, again by Dynamic Host Configuration Protocol server distributing IP address.
The embodiment of the invention is described as follows based on the operation flow of DHCP access way:
301 steps, set-top box is with after DSLAM is connected, obtain implicit IP address from DHCP, need to carry OPTION60 and OPTION82 field in the request message, guarantee authenticity and legitimacy that set-top box inserts, set-top box is redirected to a WEB server, after set-top box is inserted account number cipher, carry out authentication by the WEB server forwards to BRAS, WEB and Dynamic Host Configuration Protocol server all can be integrated in the DSLAM equipment;
302 steps, web server are formed the request authentication message with the account number cipher information of set-top box and are sent to BRAS equipment;
303 steps are returned response message after the BRAS device authentication;
304 steps if the success of set-top box authentication then distributes the IP address that can work to set-top box again by DHCP, allow set-top box to insert, and successfully set up communication link between set-top box and the DSLAM, otherwise the refusal set-top box inserts;
After 305 steps, set-top box browse to the multicast address of IPTV program stream information, send this multicast group request message of adding, the standard compliant IGMP agreement of this message;
306 steps, DSLAM sends to BRAS equipment and adds the multicast authentication message, carries multicast group address and usersaccount information in the message;
307 steps, BRAS equipment adds the request message authentication of this multicast group to set-top box, and returns authenticating result;
308 steps, if the response message of BRAS equipment represents to allow set-top box to insert, then DSLAM abandons this multicast group address message of this adding, otherwise, whether DSLAM searches in the multicast group of having set up is the multicast code stream that has received, if there is not the multicast code stream of reception, DSLAM sends request to broadband router and adds this multicast group request, and message is followed the IGMP message of standard;
309 steps, the multicast group address that the router inspection has received self, if the multicast code stream that has received then forwards step 311 to and continues to carry out, otherwise broadband router sends the request of adding multicast group address to the convergence-level network, continues subsequent step 310;
310 steps, convergence-level sends the multicast code stream to broadband router, and this multicast group address is the multicast group address that the broadband router request receives;
311 steps, broadband router sends the multicast code stream to DSLAM;
312 steps, DSLAM is according to the corresponding relation of multicast address and port, find port after, DSLAM sends the multicast code stream information to set-top box.
In the implementation method of the present invention, BRAS equipment and DSLAM duplicate the audio-video-frequency broadcast flow towards the user of PPP over Ethernet or DHCP mode, and user oriented multicast replication point is BRAS equipment and DSLAM.The concrete existing equipment normality condition of using of method of the present invention can be with reference to the definition of " IPTV of China Telecom platform set-top box technique standard ".
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. access layer network is realized the method for multicast in the IPTV system, be applied to the existing multicast of realizing access layer network IPTV business based on the broadband access network system, it is characterized in that, between convergence-level and Access Layer, be provided with broadband router, the digital subscriber line access server is set between set-top box and BAS Broadband Access Server, digital subscriber line access server and broadband router are that the network of high bandwidth is connected, and may further comprise the steps:
(1) after the digital subscriber line access server gets access to the account number cipher information of set-top box, be transmitted to BAS Broadband Access Server and carry out the authentication judgement, authentication is passed through, and then described set-top box and digital subscriber line access server connect;
(2) when the user asks in the IPTV business medium stream information of certain, described set-top box sends a request message to the digital subscriber line access server, request adds the multicast group of this medium stream information, and described digital subscriber line access server is transmitted to BAS Broadband Access Server with request message;
(3) described BAS Broadband Access Server is intercepted and captured this message, therefrom takes out the multicast group address of request adding, and judges whether this user has the multicast group that authority adds this medium stream information;
(4) if the response message of described BAS Broadband Access Server represents not allow adding, then it abandons this request message, otherwise, described digital subscriber line access server judges in the multicast code stream that has received whether comprise this multicast group address, as not comprising, then described digital subscriber line access server sends this request message to broadband router, described broadband router judges in the multicast code stream that has received whether comprise this multicast group address, as not comprising, then described broadband router sends this request message to the convergence-level network, described convergence-level network sends to described broadband router with the multicast group of correspondence, and is transmitted to described digital subscriber line access server by it;
(5) described digital subscriber line access server duplicates this multicast group information, with port numbers that described set-top box connected therewith multicast group set up corresponding relation, and the connection that described multicast code stream is set up according to described step (1) is sent to the broadcast of decoding of described set-top box.
2. the method for claim 1 is characterized in that, described step (1) further comprises:
When authentication is not passed through, then do not allow this set-top box and described digital subscriber line access server to connect.
3. the method for claim 1 is characterized in that, described request message is standard compliant Internet group management protocol message.
4. the method for claim 1 is characterized in that, described step (4) further comprises:
Described digital subscriber line access server comprises this multicast group address, then directly in the execution in step (5) with port numbers that described set-top box connected therewith multicast group set up corresponding relation, and the connection that described multicast code stream is set up according to described step (1) is sent to the broadcast of decoding of described set-top box.
5. the method for claim 1 is characterized in that, described step (4) further comprises:
If described broadband router comprises this multicast group address, then duplicate this multicast group information and give described digital subscriber line access server, and in the execution in step (5) with port numbers that described set-top box connected therewith multicast group set up corresponding relation, and the connection that described multicast code stream is set up according to described step (1) is sent to the broadcast of decoding of described set-top box.
6. the method for claim 1 is characterized in that, described step (1) further comprises:
Described set-top box reaches and receives the set-top box of handling the multicast code stream for having PPP over Ethernet or DHCP mode;
Described digital subscriber line access server is supported PPP over Ethernet or DHCP mode and management for having, Internet igmpinternet and duplicate and transmit the digital subscriber line access server of multicast code stream.
7. method as claimed in claim 6, it is characterized in that, described step (1) further comprises: when described set-top box adopts DHCP mode and digital subscriber line access server to connect, described digital subscriber line access server obtains the request connection message of described set-top box, and distribute implicit IP address to give described set-top box, described set-top box is redirected on the WEB server, get access to the account number cipher information of this set-top box by described WEB server, be transmitted to BAS Broadband Access Server and carry out authentication and judge.
8. method as claimed in claim 7 is characterized in that, the described request connection message is the OPTION60 that carries DHCP definition and the request connection message of OPTION82 field contents.
9. method as claimed in claim 6 is characterized in that, described step further comprises in (1): described set-top box adopts PPP over Ethernet to set up the point-to-point protocol link by the digital subscriber line access server of ADSL Modem and local side.
10. method as claimed in claim 9, it is characterized in that, digital subscriber line access server described in the step (5) is set up the multicast code stream according to described step (1) connection sends, further comprise: if the peer-peer protocol link that adopts PPP over Ethernet to set up is packed the back to the multicast code stream and sent.
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