CN1668023A - Network architecture and transmission method suitable for digital media release service - Google Patents
Network architecture and transmission method suitable for digital media release service Download PDFInfo
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Abstract
This invention relates to a network structure and a transmission method suitable for digit media issue service including a media issuing network, an issuing center and several receiving terminals, among which, the media issuing network is composed of a core network and an assist network overlapped on geographical positions, the core network uses broadcast and multicast transmission method to provide end-to-end single-way data transmission rom the issuing center to the receive terminals, the assist network provides two-way data communication of end-to-end from the center to the receive terminals, among which, the core network applies a tree-like topology and uses the broadcast of step-by-step or multicast technology to support real-time video/audio flow transmission and data transmission from the center to multiple receive ends.
Description
Technical field
The present invention relates to areas of information technology, be specifically related to a kind of network configuration and transmission method of suitable digital media distribution business.
Background technology
The characteristics that digital media distribution is used are (or a small amount of) information source a large amount of audients that release news.Following several having of the application of carrying out the information issue on the network and realization technological model thereof: 1. as on computer data network (TCP/IP network), to communicate the less demanding data message issue of real-time; 2. on data network, adopt the stream technology to carry out the issue of video display (looking audio frequency) information.
Use traditional end-to-end data communication technology, under the situation of receiving terminal enormous amount, the traffic aggregation effect can occur, influence the fluency of network data transmission greatly near information source.For the fluency that guarantees to transmit, particularly under the situation of using stream technical transmission audiovisual information, often need the reception user grouping in the network (generally being) according to the geographical position burst, in the place near different user groups mirror phase server is set, this has improved the equipment investment that the information issue is used greatly.
Multicasting technology is suggested under this application demand.By the support to multicast transmission of multicast router and multicast protocol, the packet of load identical information only transmits once on the consolidated network link.Compared with traditional unicast technique, for the application of information issue type, multicasting technology wants much reasonable to the utilization of the network bandwidth.But in present the Internet, owing to many reasons, multicast is not really implemented on a large scale.
Summary of the invention
In order to overcome the deficiency of traditional TCP/IP network to the digital media distribution business support, the invention provides a kind of network configuration and corresponding flow transmission technology and authentic data multicast transmission method of novel suitable digital media distribution business, can between media releasing center and a large amount of receiving terminal, ensure the transmission of smooth video-voice frequency flow, reliable multi-case data transmission is provided, realizes high efficiency network bandwidth utilization.
The technical solution adopted for the present invention to solve the technical problems is as follows:
A kind of network configuration of suitable digital media distribution business and transmission method, comprise the media releasing network, an issue center and several receiving terminals of being connected with the media releasing network, described media releasing network is made up of core network and auxiliary network, and these two network configurations are overlapping on the geographical position; Described core network uses broadcasting and multicast transmission method, and the transmission of the one-way data end to end from the issue center to receiving terminal is provided; Described auxiliary network provides between issue center and the receiving terminal bidirectional data communication end to end.
Described core network adopts tree topology, comprises three kinds of different router devices, and asymmetrical communication link:
With the source router that the issue center is connected, source router is the top of whole core network, connects the intermediate router or the border router in some downstreams;
Intermediate router, intermediate router only connect the source router or the intermediate router of a upstream, and an intermediate router can connect the intermediate router or the border router in some downstreams;
With the border router that some receiving terminals are connected, border router only connects the source router or the intermediate router of a upstream;
Connect the asymmetric communication link of above-mentioned router, the downlink bandwidth of these communication links is much larger than upstream bandwidth.
Path from source router to each border router can be different, promptly are the tree of root with the source router, and the height of its each branch can be different.
Described core network uses broadcasting and multicast transmission method, specifically comprises real-time broadcasting, multicast in real time, reliable broadcast and four kinds of transmission methods of reliable multicast; Described four kinds of transmission methods all adopt the connection of at first setting up respective type, then carry out the broadcast or multicast transmission, discharge the process that connects at last.
Described broadcasting establishment of connection process is to send the request of connecting by source router to the direct neighbor router of lower floor, each router of the 2nd layer list item that correspondingly connects then, send affirmation to source router, and the 3rd layer router of this connection request to all its direct reports sent; The rest may be inferred, and up to border router, promptly connecting is top down, carries out step by step.
Described multicast establishment of connection process is to send the request of connecting by source router to the direct neighbor router of lower floor, specifies sign, type and the QoS parameter of this connection, and sends the tabulation that whole multicast receives the user.Transmit successively by intermediate router, up to border router; Border router is checked direct-connected user and the user list that receives, and gets common factor as the actual reception user; If the common factor non-NULL has then been set up corresponding connection registration list item, and sends affirmation to the router on its upper strata, will self join in this multicast connection; Last level router repeats this process again, passback so successively, and up to source router, the request of promptly connect setting up is top down transmitted step by step, returns step by step from bottom to up but be confirmed to be.
The transmission course of described real-time broadcasting and multicast is carried out broadcast or multicast for carrying out packet replication step by step, and every level router only carries out the multi-case data transmission to the downstream router that belongs to this multicast connection, does not confirm between adjacent the superior and the subordinate router; By the bandwidth reserved strategy, realize looking the real-time Transmission of Streaming Medias such as audio frequency.
The first method of the transmission course of described reliable broadcast and multicast adopts forward error correction, carries out forward error correction coding at the source router of transmitting terminal, decodes accordingly at border router, does not confirm between adjacent the superior and the subordinate router during transmission.
The second method of the transmission course of described reliable broadcast and multicast adopts the mode of transmitting and feeding back step by step of storing step by step, carries out error detection, feedback re-transmission step by step, thereby guarantees reliability of data transmission.
Described release connection procedure is specified the sign that connects for sending the dismounting connection request with the all-router of this join dependency by source router in the 2nd layer; After receiving the replying of each router of the 2nd layer, discharge the connection registration list item of self, discharge the corresponding bandwidth resource.The 2nd layer of router uses identical method to discharge connection.And the like, until border router; Promptly discharging connection procedure is top down, carries out step by step.
The applied business of support of the present invention has: one, carry out real-time release to all audients, be also referred to as the real-time media broadcast service; Two, carry out real-time release to a part of audient, be also referred to as real-time media multicast service; Three, the reliable media information broadcast service of issuing to all audients simultaneously; Four, media information is subscribed to and is sent service reliably, and the user subscribes to media information as traditional papers and magazines subscriber, and in the time bar of agreement, information has been sent to booking reader's receiving terminal reliably.The transmission means that adopts is listed as follows:
| Real-time Transmission | Reliable transmission | |
| Broadcast mode | First kind of business | The third business |
| The multicast mode | Second kind of business | The 4th kind of business |
The issue of the real-time video-voice frequency flow medium of real-time Transmission business support, the issue of reliable transmission service support data; On the other hand, broadcast service is all audient's services, and the multicast service is specific user (as the booking reader) service of a part.
The workflow of core network is in the network of the present invention:
Network at first carries out initialization, method or automatic adjacent node discovery mechanism by configuration, source router is set up the registration form of downstream direct neighbor node, each intermediate router has all been set up the registration form of upstream direct neighbor node and all downstream direct neighbor nodes, and each border router has been set up the registration form of upstream direct neighbor node registration form and user's receiving terminal (main frame).Like this, topology of networks is established.
At four kinds of applied business that the media releasing network provides, the basic mode of its realization all comprises three steps: the broadcast or multicast of at first setting up from source router to each edge router connects, and carries out real-time flow transmission or reliable data transmission then; Discharge at last and connect.
The characteristic of network configuration of the present invention and transmission method mainly shows:
1, the present invention adopts the core network of tree topology and the common Internet to constitute the media releasing network jointly, can be achieved at existing broadcasting and television network and the Internet on less expensive ground;
2,, realize looking the real-time Transmission of Streaming Medias such as audio frequency by the bandwidth reserved strategy;
3,, can select to realize the reliable broadcast or the multicast of data by forward error correction or feedback method step by step according to network transmission line condition and the variation of branches step by step.
The invention provides the network configuration and corresponding broadcasting in real time and multicast transmission method, authentic data broadcasting and the multicast transmission method that are fit to the digital media distribution business, between media releasing center and a large amount of receiving terminal, ensure the transmission of smooth video-voice frequency flow, reliable broadcast or multicast transfer of data is provided, realizes high efficiency network bandwidth utilization.
Description of drawings
Fig. 1 is the logical construction schematic diagram of network configuration of the present invention;
Fig. 2 is the internal structure schematic diagram of core network in the network configuration of the present invention.
Embodiment
The structure of media information delivery network is referring to Fig. 1, and the residing position of information source is called issue center (3), and the audient then is in receiving terminal (4).The media releasing network has then connected issue center (3) and a large amount of receiving terminals (4).
Media releasing network (5) is by core network (1) and the common formation of auxiliary network (2).Wherein, core network (1) uses broadcasting and multicasting technology, and the transmission of the one-way data end to end from the issue center to receiving terminal is provided, and auxiliary network (2) provides between issue center and the receiving terminal bidirectional data communication end to end.Issue center (3) is in the top of core network (1), and receiving terminal (4) then is in the border of core network (1).
Core network (1) and auxiliary network (2) are overlapping on the geographical position, in order to support the actual demand of digital media distribution business, this network has been considered asymmetry on topological structure: the asymmetry of information flow-rate, and the issue center is to user's the flow of flow much larger than the user to the issue center; The asymmetry of website quantity, the quantity of issue central site are also much smaller than receiving number of users.
When implementing, the transmission link of core network can utilize asymmetrical SDH transmission line, perhaps utilizes the circuit of cable TV HFC network to set up; Auxiliary network can utilize existing TCP/IP network to set up.
Referring to accompanying drawing 2, core network (1) is a kind of tree topology network, is made up of following key equipment:
1, source router (node S) (6)
2, intermediate router (node I) (7)
3, border router (node E) (8)
4, the communication link (9) that connects above-mentioned router
Whole topology of networks is a tree.Be called " upstream " or " upper strata " near top (root of tree).Be called " downstream " or " lower floor " near bottom (border).
A source router (6) is the top (root of tree) of whole core network.This source router connects the intermediate router or the border router in some downstreams.
An intermediate router (7) only connects the source router or the intermediate router of a upstream.An intermediate router can connect the intermediate router or the border router in some downstreams.
A border router (8) only connects the source router or the intermediate router of a upstream.A border router connects some user's receiving terminals.
Connect by asymmetric communication link (9) between the router in downstream and the router of upstream.The downlink bandwidth of this communication link (i.e. bandwidth from the upstream router to the downstream router) is much larger than upstream bandwidth.
In the whole core network, the path that arrives different border routers from source router can be inequality.That is to say that core network has not contour tree topology structure, source router is in the 1st layer.To some border routers that is in n layer (n 〉=2), must pass through n-2 intermediate router from source router, and corresponding n-1 communication link.
Simultaneously, the quantity of the different direct-connected corresponding downstream routers of upstream router also can have nothing in common with each other.Be the tree of root with the source router promptly, the height of its each branch can be different.
Media releasing center (3) is connected on the source router (6).This center is generally a local area network (LAN) that uses ICP/IP protocol.
User's receiving terminal (4) is connected on the edge router (8).These receiving terminals are generally the main frame that adopts ICP/IP protocol.
Core network to the support of concrete business is:
One, core network is to the implementation procedure of real-time media broadcasting service
(1) broadcast establishment of connection in real time: source router sends the request of connecting to the direct neighbor router (intermediate router or border router) of lower floor, and specifies sign, type and the QoS parameter of this connection.The type here is that broadcasting connects in real time, and service quality comprises bandwidth requirement etc.After receiving this request, each router of the 2nd layer list item that correspondingly connects is reserved the corresponding bandwidth resource, sends affirmation to source router, and the 3rd layer router of this connection request to all its direct reports sent.And the like, arrive border router until connection request, and on border router, set up to connect and registered list item.
(2) transmission of broadcast data in real time: source router sends real-time broadcast data to each downstream router on the connection identifier of being set up, and each lower exit sends a grouping copy.To each grouping, the 2nd layer of router do not made affirmation to source router.The 2nd layer of router with each grouping of receiving again successively all the 3rd layer of routers under it self send a grouping copy.And the like, arrive each border router successively until each grouping.
Here, the feature of broadcast data transmission is in real time: carry out packet replication and broadcasting step by step, do not confirm between adjacent the superior and the subordinate router.
(3) release that connects of broadcasting in real time: source router sends the dismounting connection request to the 2nd layer router, specifies the sign that connects, and after receiving the replying of each router of the 2nd layer, discharges the connection registration list item of self, discharges the corresponding bandwidth resource.From the 2nd layer router, and the like, use identical method to discharge and connect, until border router.Discharge to connect and top down carry out step by step.
Two, core network is to the implementation procedure of real-time media multicast service
(1) real-time multicast establishment of connection: source router sends the request of connecting to the direct neighbor router (intermediate router or border router) of lower floor, specify sign, type and the QoS parameter of this connection, and send the tabulation (tabulation of user's receiving terminal) that whole multicast receives the user.The type here is that real-time multicast connects, and service quality comprises bandwidth requirement etc.After receiving this request, each router of the 2nd layer is not replied source router immediately, but the 3rd layer router of this connection request to all its direct reports sent.And the like, arrive border router until this multicast connection request.
Border router is checked the reception user list that its direct-connected user and this multicast connect, and gets it and occurs simultaneously as the actual reception user of this connection.If occuring simultaneously is not empty set, then on border router, has set up to connect and registered list item, and sent affirmation to the router on its upper strata; If occur simultaneously is empty, then indicates self not belong to this multicast set in connection is replied.
As certain router of the intermediate level behind the return information of having collected from lower floor's router of all direct neighbors, when existing above subordinate's router to belong to the reception object of this multicast connection request, list item then correspondingly connects, reserve the corresponding bandwidth resource, and send affirmation to the router on its upper strata; Otherwise, self do not belong to this multicast set in the connection of the router on upper strata is replied, indicating.
Through above-mentioned from bottom to up until the reverse affirmation transmittance process of source router, each router in the whole core network has all been set up corresponding connection list item, register in its subordinate's router which router and belonged to this multicast and connect, and reserved corresponding bandwidth.
(2) transmission of multi-case data in real time: source router sends real-time multi-case data to each downstream router that belongs to this multicast connection on the multicast connection identifiers of being set up, each lower exit sends a grouping copy accordingly.To each grouping, the 2nd layer of router do not made affirmation to source router.The 2nd layer of router with each grouping of receiving again successively each the 3rd layer of router that this multicast connects that belongs under it self send a grouping copy.And the like, arrive each successively until each grouping and belong to the border router that this multicast connects.Border router is sent to each receiving terminal with the grouping that this multicast connects at last.
Here, the feature of multi-case data transmission in real time is: carry out packet replication and multicast step by step, every level router only carries out the multi-case data transmission to the downstream router that belongs to this multicast connection, does not confirm between adjacent the superior and the subordinate router.
(3) release of the connection of multicast in real time: source router sends the dismounting connection request to the 2nd layer the all-router that belongs to this multicast connection, specify the sign that connects, after receiving the replying of each router of the 2nd layer, discharge the connection registration list item of self, discharge the corresponding bandwidth resource.From the 2nd layer router, and the like, use identical method to discharge and connect, until border router.Discharge to connect and top down carry out step by step.
Three, core network is to the implementation procedure of reliable media broadcast business
(1) reliable broadcast establishment of connection: source router sends the request of connecting to the direct neighbor router (intermediate router or border router) of lower floor, and specifies sign, type and the QoS parameter of this connection.The type here is that reliable broadcast connects and corresponding reliable transmission control mode, and service quality comprises the expectation of average bandwidth etc.After receiving this request, each router of the 2nd layer list item that correspondingly connects sends affirmation to source router, and the 3rd layer router of this connection request to all its direct reports is sent.And the like, arrive border router until connection request, and on border router, set up to connect and registered list item.
What be different from real-time broadcasting connection is: in reliable broadcast establishment of connection process, each level router is selectable to the reservation of bandwidth.Reservation policy be can use, statistic multiplexing, transmission policy as possible also can be used.
(2) transmission of reliable broadcast data: the transmission of reliable broadcast has two kinds of basic implementations, and first kind is the mode that adopts forward error correction, second kind of mode that is to use storage step by step to transmit and feed back step by step.
When using first kind of mode, source router at first will carry out forward direction redundant correcting coding from the application layer data at issue center, on the connection identifier of being set up, send broadcast data to each downstream router then, each lower exit sends a grouping copy.To each grouping, the 2nd layer of router do not need source router is made affirmation.The 2nd layer of router with each grouping of receiving again successively all the 3rd layer of routers under it self send a grouping copy.And the like, arrive each border router successively until each grouping.On border router, forward direction redundant correcting coding is decoded, recover former application layer data, be delivered to end user's receiving terminal again.
The feature of first kind of reliable broadcast transfer of data is: source router carries out forward error correction coding, and border router is decoded accordingly, and whole encoding-decoding process is to the partially transparent beyond the core network; During transmission, router carries out packet replication and broadcasting step by step, does not confirm between adjacent the superior and the subordinate router.The specific coding mode of forward error correction coding and redundancy can change according to transmission channel conditions and application demand.
When using the second way, source router at first will carry out buffer-stored from the application layer data at issue center, and grouping serial number and error detection coding on the volume are then on the connection identifier of being set up, send broadcast data to each downstream router, each lower exit sends a copy.For each grouping, the 2nd layer of router must be responded the affirmation information that whether correctly receives to source router.Have only wait all downstream nodes all report accurate received the grouping after, the upper strata router just discharges the data buffer zone; If there is the part router not have the correct information that receives of feedback in lower floor's router, then the upper strata router need retransmit.Concrete re-transmission mode: can all transmit again one time all lower floor's routers, perhaps only the router that does not have correct reception information be transmitted again.On source router, be synchronous at the sliding window of each lower floor's router.
Correctly receive broadcast data from each router of the 2nd layer, each router adopts the mode identical with the source media router again, whether the router to its lower floor is broadcasted, and retransmit according to the affirmation information decision of receiving, moves corresponding sliding window then.This process is successively carried out, up to border router.
The feature of second kind of reliable broadcast transfer of data is: until border router, adopt the storage retransmission technique from source router, carry out confirmation of receipt step by step between the router; Each level router, and if only if received the affirmation of all-router of its direct report after, discharge corresponding data buffer zone.
(3) release of reliable broadcast connection: source router sends the dismounting connection request to the 2nd layer router, specify the sign that connects, after receiving the replying of each router of the 2nd layer, discharge the connection registration list item of self, then discharge the corresponding bandwidth resource if reserved bandwidth.From the 2nd layer router, and the like, use identical method to discharge and connect, until border router.With different in the traditional TCP/IP network be to discharge here to connect and top down carries out step by step.
Four, core network is to the implementation procedure of reliable medium multicast service
(1) reliable multicast establishment of connection: and the multicast establishment of connection is similar in real time, source router sends the request of connecting to the direct neighbor router (intermediate router or border router) of lower floor, specify sign, type and the QoS parameter of this connection, and send the tabulation (tabulation of user's receiving terminal) that whole multicast receives the user.The type here is that reliable multicast connects and corresponding reliable transmission control mode (referring to following the 2nd point), and service quality comprises the expectation of average bandwidth etc.After receiving this request, each router of the 2nd layer is not replied source router immediately, but the 3rd layer router of this connection request to all its direct reports sent.And the like, arrive border router until this multicast connection request.
Border router is checked the reception user list that its direct-connected user and this multicast connect, and gets it and occurs simultaneously as the actual reception user of this connection.If occuring simultaneously is not empty set, then on border router, has set up to connect and registered list item, and sent affirmation to the router on its upper strata; If occur simultaneously is empty, then indicates self not belong to this multicast set in connection is replied.
As certain router of the intermediate level behind the return information of having collected from lower floor's router of all direct neighbors, when existing above subordinate's router to belong to the reception object of this multicast connection request, list item then correspondingly connects, selectively reserve the corresponding bandwidth resource, and send affirmation to the router on its upper strata; Otherwise, self do not belong to this multicast set in the connection of the router on upper strata is replied, indicating.
Through above-mentioned from bottom to up until the reverse affirmation transmittance process of source router, each router in the whole core network has all been set up corresponding connection list item, register in its subordinate's router which router and belonged to this multicast and connect, and selectively reserved corresponding bandwidth.
(2) transmission of reliable multicast data has two kinds of basic implementations, and a kind of is forward error correction mode, and another kind is to store step by step to transmit also feedback acknowledgment mode step by step, and is all similar with the transmission of reliable broadcast data.The difference of the operating process that it is concrete only is in the reliable multicast transport service, and source router and each intermediate router are only to the router transmission information of (rather than in the reliable broadcast transport service to all) the downstream direct neighbor that belongs to that this multicast is connected.
(3) release of reliable multicast connection: source router sends the dismounting connection request to the 2nd layer router, specify the sign that connects, after receiving the replying of each router of the 2nd layer of belonging to this connection, discharge the connection registration list item of self, then discharge the corresponding bandwidth resource if reserved bandwidth.From the 2nd layer router, and the like, use identical method to discharge and connect, until border router.The feature of this release connection procedure is top down carried out step by step.
Claims (10)
1, a kind of network configuration of suitable digital media distribution business and transmission method, comprise the media releasing network, an issue center and several receiving terminals of being connected with the media releasing network, it is characterized in that: described media releasing network is made up of core network and auxiliary network, and these two network configurations are overlapping on the geographical position;
Described core network uses broadcasting and multicast transmission method, and the transmission of the one-way data end to end from the issue center to receiving terminal is provided;
Described auxiliary network provides between issue center and the receiving terminal bidirectional data communication end to end.
2, the network configuration of a kind of suitable digital media distribution business according to claim 1 and transmission method is characterized in that: described core network adopts tree topology, comprises three kinds of different router devices, and asymmetrical communication link:
With the source router that the issue center is connected, source router is the top of whole core network, connects the intermediate router or the border router in some downstreams;
Intermediate router, intermediate router only connect the source router or the intermediate router of a upstream, and an intermediate router can connect the intermediate router or the border router in some downstreams;
With the border router that some receiving terminals are connected, border router only connects the source router or the intermediate router of a upstream;
Connect the asymmetric communication link of above-mentioned router, the downlink bandwidth of these communication links is much larger than upstream bandwidth.
3, the network configuration of a kind of suitable digital media distribution business according to claim 2 and transmission method is characterized in that: the path from source router to each border router can be different.
4, the network configuration of a kind of suitable digital media distribution business according to claim 1 and transmission method, it is characterized in that: described core network uses broadcasting and multicast transmission method, specifically comprises real-time broadcasting, multicast in real time, reliable broadcast and four kinds of transmission methods of reliable multicast; Described four kinds of transmission methods all adopt the connection of at first setting up respective type, then carry out the broadcast or multicast transmission, discharge the process that connects at last.
5, the network configuration of a kind of suitable digital media distribution business according to claim 4 and transmission method, it is characterized in that: described broadcasting establishment of connection process is to send the request of connecting by source router to the direct neighbor router of lower floor, each router of the 2nd layer list item that correspondingly connects then, send affirmation to source router, and the 3rd layer router of this connection request to all its direct reports sent; The rest may be inferred, and up to border router, promptly connecting is top down, carries out step by step.
6, the network configuration of a kind of suitable digital media distribution business according to claim 4 and transmission method, it is characterized in that: described multicast establishment of connection process is to send the request of connecting by source router to the direct neighbor router of lower floor, specify sign, type and the QoS parameter of this connection, and send the tabulation that whole multicast receives the user.Transmit successively by intermediate router, up to border router; Border router is checked direct-connected user and the user list that receives, and gets common factor as the actual reception user; If the common factor non-NULL has then been set up corresponding connection registration list item, and sends affirmation to the router on its upper strata, will self join in this multicast connection; Last level router repeats this process again, passback so successively, and up to source router, the request of promptly connect setting up is top down transmitted step by step, returns step by step from bottom to up but be confirmed to be.
7, the network configuration of a kind of suitable digital media distribution business according to claim 4 and transmission method, it is characterized in that: the transmission course of described real-time broadcasting and multicast is for carrying out packet replication step by step, carry out broadcast or multicast, every level router only carries out the multi-case data transmission to the downstream router that belongs to this multicast connection, does not confirm between adjacent the superior and the subordinate router; By the bandwidth reserved strategy, realize looking the real-time Transmission of Streaming Medias such as audio frequency.
8, the network configuration of a kind of suitable digital media distribution business according to claim 4 and transmission method, it is characterized in that: the transmission course of described reliable broadcast and multicast adopts forward error correction, source router at transmitting terminal carries out forward error correction coding, decode accordingly at border router, do not confirm between adjacent the superior and the subordinate router during transmission.
9, the network configuration of a kind of suitable digital media distribution business according to claim 4 and transmission method, it is characterized in that: the mode that the transmission course of described reliable broadcast and multicast adopts storage step by step to transmit and feed back step by step, carry out error detection, feedback re-transmission step by step, thereby guarantee reliability of data transmission.
10, the network configuration of a kind of suitable digital media distribution business according to claim 4 and transmission method, it is characterized in that: described release connection procedure is specified the sign that connects for sending the dismounting connection request with the all-router of this join dependency by source router in the 2nd layer; After receiving the replying of each router of the 2nd layer, discharge the connection registration list item of self, discharge the corresponding bandwidth resource.The 2nd layer of router uses identical method to discharge connection.And the like, until border router; Promptly discharging connection procedure is top down, carries out step by step.
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