CN101123526B - An implementation method for large-scale stream media transmission structure - Google Patents
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Abstract
A method realizes a large-scale stream media transmission structure and has five steps. Firstly, a started retransmission node controller sends a heartbeat message to determine the type of each media retransmission node; secondly, each media retransmission node sends a heartbeat message to determine the distribution status in each multicast island; thirdly, each multicast island elects an aggregation node, which synthesizes the topological structure of multicast islands and the information of nodes that are then sent to the retransmission node controller, which, therefore, knows the global topological structure; fourthly, as for every newly admitted user terminal, the retransmission node controller selects a media retransmission node for the user terminal by the method of automatic access of users; finally, after the access of the user terminal, for each newly established session, each neighboring multicast island elects a communication node or an agent node, which takes charge of the data intercommunication between each neighboring multicast island and the main multicast island, and the data message sent by the user terminal is correctly transmitted to other user terminals in the session according to the method of multimedia data retransmission between each communicated node and each agent node. The present invention effectively increases the scale and stability of system access and the interactive quality among different network operators.
Description
Technical field
The present invention relates to the application of large scale multimedia network, especially relate to a kind of implementation method of extensive real time flow medium transmission structure.
Background technology
Volume of transmitted data is big in the video conferencing system, under traditional central server/client model, because server bandwidth, disposal ability are limited, causes system scale and limited scalability.The IP multicast is conserve network bandwidth to greatest extent, but because technology and commerce, multicast is not open-minded on a large scale, the IP multicast isolated island that is distributing a large amount of among the Internet.Therefore, break through traditional server/client's mode, and make full use of the transmittability of IP multicast isolated island, effective conserve network bandwidth and server handling ability.Application layer multicast utilizes terminal or the forward node that is deployed in the network realizes that in application layer multicast services can utilize the multicast-capable of IP multicast isolated island simultaneously easily. in traditional application layer multicast, Scribe, Bayeux, CAN realize multicast based on distributed hash table, its neighborhood in logic can not reflect vicinity physically, transmission delay is bigger, is not suitable for the real time flow medium transmission; Narada, HMTP, Yoid, ALMI, NICE, HostCast, they all rely on end system to realize multicast, and the transmission delay and the stability of a system all are difficult to guarantee.By in network, strategically disposing forward node structure nerve of a covering, it is the developing direction of extensive high-quality group communication, and in the application layer multicast application based on nerve of a covering, RMX is applicable to reliable application layer multicast, Overcast, OMNI are applicable to the application in forms data source, Scattercast emphasizes the popularity used can't satisfy the real time flow medium transmission requirements; And these nerve of a covering structures all realize the correct distribution of data message by making up with safeguarding multicast distribution tree, but the structure of multicast distribution tree consumes a large amount of control expense and node memory with safeguarding, having limited system scale influences the stability of a system simultaneously.
Summary of the invention
Technical problem of the present invention: overcome the deficiencies in the prior art, provide a kind of effectively raising system to insert scale and stability, can significantly improve large-scale stream media transmission structure and its implementation of interactive quality between the heterogeneous networks provider customer.
Technical solution of the present invention: a kind of implementation method of large-scale stream media transmission structure, it is characterized in that: described transmission structure is made up of the medium forward node that is deployed in any amount in numerous IP multicast isolated islands and unique forward node controller, medium forward node access user terminal under the control of forward node controller wherein, comprise multicast user and unicast user, the multicast isolated island of having disposed unique forward node controller is called as main multicast isolated island, other multicast isolated islands are called as neighbours' multicast isolated island, the medium forward node can be installed the polylith network interface, each network interface can be linked into same multicast isolated island or different multicast isolated island arbitrarily, and the performing step of described transmission structure is as follows:
(1) the forward node controller starts back transmission heartbeat message, to determine each medium forward node type: if the all-network interface of medium forward node is all received this heartbeat message, then this medium forward node type is main isolated island isolated node, if the all-network interface of medium forward node all can not receive this heartbeat message, then this medium forward node type is neighbours' isolated island isolated node, if the medium forward node has the subnetwork interface to receive this heartbeat message, and part can not receive, and then this medium forward node type is alternative connection node;
(2) each medium forward node sends heartbeat message after the type of determining self, to determine that the medium forward node is at each multicast isolated island distribution situation, i.e. topological structure;
(3) each multicast isolated island elects aggregation node, and the comprehensive neighbours' multicast of aggregation node isolated island topological structure and nodal information are submitted to the forward node controller, and the forward node controller is known global Topological Structure thus;
(4) to each initiate user terminal, the forward node controller is according to the global Topological Structure of knowing, adopting the automatic cut-in method of user is certain suitable medium forward node of this user terminal selecting;
(5) after user terminal inserts, to each newly-built session, each neighbours' multicast isolated island elects and is communicated with node or agent node, be responsible for the data interchange between each neighbours' multicast isolated island and main multicast isolated island, each is communicated with between node and each agent node, or between each agent node, or cooperatively interact between the connection node, according to the multi-medium data retransmission method data message that this user terminal sent correctly is delivered to other user terminals of this session.
Wherein step (2) further comprises:
(a) medium forward node all-network interface multicast transmitting-receiving heartbeat message, the heartbeat message content comprises node type, start-up time and loading condition;
(b) at definite each network interface of medium turning point node after each multicast isolated island distribution situation, continue to represent this node in this multicast isolated island, to receive and dispatch heartbeat message with medium forward node network interface address reckling in each multicast isolated island, other medium forward node network interfaces then stop to send, to reduce the message expense.
Wherein step (3) further comprises:
(1) the periodic heartbeat message that each medium forward node multicast sends in the multicast isolated island is received by other all medium forward node in this isolated island;
(2) after each medium forward node was received the heartbeat message of other medium forward node in the multicast isolated island, election start-up time, medium forward node the earliest was an aggregation node;
(3) aggregation node is according to each medium forward node heartbeat message in the multicast isolated island, and type, start-up time, loading condition, the network interface information clean culture of each medium forward node send the forward node controller in the comprehensive multicast isolated island.
Wherein the automatic cut-in method of user of step (4) is achieved as follows:
(1) user terminal obtains medium forward node multicast and sends the address of heartbeat message and monitor heartbeat message in this address by configuration file;
(2) if described user terminal is received the heartbeat message of any medium forward node, then show in the multicast isolated island of user terminal place and disposed the medium forward node, this user terminal will be received and dispatched message by multicast, and by the state of the aggregation node monitoring users terminal of place multicast isolated island, user terminal is so far finished access; Otherwise continue next step;
(3) whether user terminal has medium forward node controller and user terminal to belong to same Virtual network operator by the inquiry of forward node controller, if such node is arranged, the forward node controller will return the lightest node of wherein load and corresponding network interface IP address thereof, this user terminal will be by this forward node network interface clean culture transmitting-receiving message, and by the state of this node monitoring users terminal, user terminal is so far finished access; Otherwise, continue the step down;
(4) user terminal is by the lightest medium forward node of forward node controller query load, user terminal is by sending bandwidth, the round-trip delay between test packet detection and these medium forward node then, be less than or equal to the node of selecting the bandwidth maximum the medium forward node of setting time delay from round-trip delay, user terminal will be by this medium forward node clean culture transmitting-receiving message, and monitor the state of this user terminal by this medium forward node, this user terminal is so far finished access; If round-trip delay is less than or equal to the medium forward node of setting time delay and does not exist, then point out the user to insert.
Wherein step (5) further comprises:
(a) if be deployed with alternative connection node in neighbours' multicast isolated island, the alternative connection node that then described isolated island internal burden is the lightest is elected as the connection node, is responsible for neighbours' multicast isolated island and main isolated island data forwarding;
(b) if do not dispose alternative connection node in neighbours' multicast isolated island, the lightest node of then described isolated island internal burden is elected as agent node, agent node is inquired about the lightest node of load in the main multicast isolated island by the forward node controller, the agent node clean culture is connected to this medium forward node, and data will be transmitted by this cast link between neighbours' multicast isolated island and main isolated island;
(c) directly realize exchanges data by multicast between main multicast isolated island node, realize indirectly and the exchange of neighbours' multicast isolated island node data by above-mentioned connection node and agent node.
Wherein the multi-medium data retransmission method in the step (5) is achieved as follows:
(1) after main isolated island isolated node or neighbours' isolated island isolated node multicast received message, clean culture was transmitted to all clean cultures of this medium forward node and inserts the user;
(2) after main isolated island isolated node or the clean culture of neighbours' isolated island isolated node received message, clean culture was transmitted to the every other clean culture of this node and inserts the user, and this message of multicast forwarding;
(3) after connection node multicast receives message, clean culture is transmitted to the every other clean culture of this node and inserts the user, if receive this message from main multicast isolated island, then to being responsible for neighbours multicast isolated island multicast forwarding, if receive this message, then transmit to main multicast isolated island from being responsible for neighbours multicast isolated island;
(4) after the clean culture of connection node received message, clean culture was transmitted to the every other clean culture of this node and inserts the user, and to the main multicast isolated island and this message of neighbours' multicast isolated island multicast forwarding of being responsible for
(5) after alternative connection node received message from main multicast isolated island multicast, clean culture was transmitted to the every other clean culture of this node and inserts the user, will abandon for the message that receives from neighbours' multicast isolated island multicast
(6) after the clean culture of alternative connection node received message, clean culture was transmitted to the every other clean culture of this node and inserts the user, and transmits this message to main multicast isolated island.
The present invention's advantage compared with prior art is:
(1) in the former research, nerve of a covering is mainly based on the structure and the maintenance of distributed hash table or distribution tree.The former neighbouring relations in logic can't reflect physically adjacent, and time delay is uncontrollable, are not suitable for real-time application.The latter has brought control information expense and systematic jitters.Invention has designed a kind of two-layer nerve of a covering structure: a plurality of medium forward node of distributed deployment in the ground floor, each multicast isolated island constitute isolated island interior nodes cluster; The second layer, neighbours' multicast isolated island is communicated with main multicast isolated island by specified scheme, formation with main multicast isolated island be center, other isolated islands around star topology, this kind implementation structure has been avoided overhead and the systematic jitters that the multicast tree structure brings in traditional nerve of a covering by the data forwarding technology, and the flexibility that the high efficiency and the application layer multicast of IP multicast are disposed combines.Through actual verification, this effectively raising system of structure inserts scale and stability, can significantly improve interactive quality between the heterogeneous networks provider customer.
(2) the data sender has limited the maximum hop count that message is transmitted, the transfer of data maximum delay thereby restriction is known clearly in the scene that main multicast isolated island is concentrated, Data Receiving person assembles at each multicast isolated island in the star structure adaptive video of the present invention meeting.
(3) in addition, effectively reduce network delay and packet loss between the heterogeneous networks provider customer, improved interactive quality by being communicated with node and agent node
Description of drawings
Fig. 1 is transmission structure example topology figure of the present invention;
The flow chart of the automatic cut-in method of user among Fig. 2 the present invention;
Fig. 3 is that multi-medium data of the present invention is transmitted schematic diagram;
Fig. 4 is the schematic diagram that system scale of the present invention increases;
Fig. 5 is the schematic diagram that actual test of the present invention postpones improvement;
The schematic diagram that Fig. 6 actual test packet loss of the present invention improves.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
As shown in Figure 1, transmission structure of the present invention is made up of the medium forward node that is deployed in any amount in numerous IP multicast isolated islands and unique forward node controller.Wherein, the medium forward node is access user terminal under the control of forward node controller, comprise multicast user and unicast user, the multicast isolated island of having disposed unique forward node controller is called as main multicast isolated island, other multicast isolated islands are called as neighbours' multicast isolated island, the configurable polylith network interface of medium forward node, each network interface can be linked into same multicast isolated island or different multicast isolated island.
Whole transmission structure is a two-layer nerve of a covering structure: a plurality of medium forward node of distributed deployment in the ground floor, each multicast isolated island constitute isolated island interior nodes cluster; The second layer, each neighbours' multicast isolated island adopts the connection node that elects aggregation node and each session in the multicast isolated island the medium forward node, constitute with main multicast isolated island be center, other isolated islands around star topology.
In Fig. 1, be deployed with 6 medium forward node and unique medium forward node controller.Suppose that each medium forward node boot sequence is by successively being followed successively by 1～6.Medium forward node 1,4,5,6 all is an isolated node, and wherein 1,5,6 is neighbours' isolated island isolated node, and 4 is main isolated island isolated node, and medium forward node 2,3 is alternative connection node.Neighbours' multicast isolated island 1 because of start-up time of node 1 prior to node 2,3, so be elected as the aggregation node of neighbours' multicast isolated island 1.Neighbours' multicast isolated island 2 because of 5 start-up times of node prior to node 6, so be elected as the aggregation node of neighbours' multicast isolated island 2.Be elected as the aggregation node of main multicast isolated island the start-up time of node 2 the earliest therefore in 2,3,4 three nodes in the main multicast isolated island.Aggregation node is transmitted the media node controller with each multicast isolated island node topology structure report, and the forward node controller is known global Topological Structure thus.
The present invention mainly comprises two core technologies: the automatic cut-in method of user, multi-medium data retransmission method.The global Topological Structure that the utilization of forward node controller is known, the automatic cut-in method of user application are the suitable access medium forward node of user terminal selecting.After the user inserted, this transmission structure utilized the multi-medium data forwarding algorithm that media stream data is transmitted to this user terminal.
As shown in Figure 2, user of the present invention to insert implementation procedure automatically as follows:
(1) monitors the heartbeat message that medium forward node multicast sends
If user terminal can be received the heartbeat message that medium forward node multicast sends, show that this user terminal place multicast isolated island has the medium forward node to dispose, therefore select multicast to insert, monitor this User Status by place multicast isolated island aggregation node, finish access, as user A, B, C, F, G, H among Fig. 1.Otherwise, adopt the clean culture access way, continue next step;
(2) check node belonging network operator
If have the network interface of forward node and user terminal to be accessed to belong to consolidated network operator, then therefrom select the lightest node of load, finish clean culture and insert.Specifically, user terminal by medium forward node controller inquiry with oneself belong to a Virtual network operator together ruin the body forward node, if such node is arranged, medium forward node controller will return the lightest medium forward node of load and access is finished in the network interface address, otherwise, continue next step.Belong to same carrier network as user terminal E among Fig. 1 and node 3 left network interfaces, user terminal I and node 3 right network interfaces belong to same carrier network, and user terminal E, I are respectively by carrying out exchanges data with the network interface that oneself belongs to consolidated network operator like this.
(3) detect and each internodal network condition
If do not have forward node network interface and user to belong to consolidated network operator, then select optimum node to insert according to bandwidth, delay size and node load situation between this user terminal and node.Specifically, the user is by 10 the lightest nodes of forward node controller query load, user terminal detects and these internodal bandwidth, round-trip delay by sending test packet then, be less than or equal to from round-trip delay and select the node of bandwidth maximum to finish access the node of 800ms, if round-trip delay is less than or equal to the node of 800ms and does not exist, then point out the user to insert.
The automatic cut-in method of user supports user multicast to insert, having made full use of the present invention will be single, multicast combines, the advantage of extensive cross operator network design, have under the situation of node deployment at IP multicast isolated island under the user terminal, the preferential multicast that adopts inserts, carry out exchanges data between user terminal and medium forward node by the IP multicast, saved the network bandwidth and node processing ability.When clean culture inserts, the preferential network interface that belongs to same operator with the user that inserts, user terminal and medium forward node are realized exchanges data by same carrier network, have adapted to the situation that same carrier network is better than network between different operators.As everyone knows, each autonomous system of Internet is safeguarded by different I SP (Virtual network operator), running boundary gateway protocol between the autonomous system (Border Gateway Protocol), because each autonomous system differs to the link circuit condition criterion, backbone network route table items number is huge, BGP can't find best route, Virtual network operator is for safeguarding that commercial interest is reluctant to mean the big bandwidth of other network openings separately simultaneously, cause between the different I SP network bandwidth low, postpone big, this is that the restriction real time flow medium is transmitted in the bottleneck of carrying out between different I SP user always. is communicated with node in the multi-network interface scheme and inserts a plurality of ISP networks by the polylith network interface, the single multicast user who adheres to different I SP like this separately is by being communicated with the node switching data, do not rely on link between the ISP. belong to ISP X respectively as about 3 two network interfaces of node among Fig. 1, ISP Y network, user terminal E, I belongs to ISP X respectively, ISP Y, user E so, I just can select a left side respectively, right network interface access is also passed through node 3 swap datas, and no longer rely on the relatively poor link of performance between ISP. and in like manner, the multicast user is also by node 3 intercommunications in the user terminal E that adheres to different I SP separately and the main multicast isolated island. and improve the bandwidth and the disposal ability that are communicated with node and just can directly improve list, real time flow medium data transmission performance between the multicast user.
As shown in Figure 3, multi-medium data retransmission method implementation procedure of the present invention.
The present invention will be communicated with node or agent node as data channel unique between isolated island, other alternative connection nodes abandon the multicast message from neighbours' multicast isolated island, thereby avoid message to receive message decision message forwarding strategy according to self type, multicast or clean culture around. node, do not need maintaining routing list, need be between node yet exchanging routing information, avoided multicast distribution tree to make up overhead and the systematic jitters that brings
With＜T, S, M/U〉the expression type is that the node of T is received data message from user terminal or medium forward node S by multicast M or clean culture U, T can be isolated node (main isolated island isolated node or neighbours' isolated island isolated node), be communicated with node, alternative connection node, represents with I, D, N respectively. and data forwarding method is as follows:
(1) for message＜I, S, M 〉, be transmitted to all clean cultures of this node and insert the user, as Fig. 3 (1);
(2) for message＜I, S, U 〉, be transmitted to all clean cultures except that S of this node and insert the user, and to place multicast isolated island multicast forwarding, as Fig. 3 (2);
(3) for message＜D, S, M 〉, be transmitted to all clean cultures of this node and insert the user; If receive this message, then to being responsible for neighbours isolated island multicast forwarding from main isolated island; If between being responsible for neighbours isolated island, receive this message, then to main isolated island multicast forwarding, as Fig. 3 (3);
(4) for message＜D, S, U 〉, be transmitted to all clean cultures except that S of this node and insert the user, and to main multicast isolated island and neighbours' multicast isolated island multicast forwarding of being responsible for, as Fig. 3 (4);
(5) for message＜N, S, M 〉,, then insert user/node and transmit to all clean cultures of this node if receive this message from main multicast isolated island; If receive this message, then abandon, as Fig. 3 (5) from neighbours' isolated island;
(6) for message＜N, S, U 〉, be transmitted to all clean cultures except that S of this node and insert the user, and to main multicast isolated island multicast forwarding, as Fig. 3 (6).
Be center, neighbours' multicast isolated island with main multicast isolated island around the star topology basis on, the present invention uses above two technology and has realized that complete user inserts, data transport service.Wherein, the global Topological Structure that the utilization of forward node controller is known inserts for user terminal provides single multicast in conjunction with the automatic access technology of user.User terminal is after access, and this transmission structure application of multimedia data forwarding technology is transmitted to this user terminal with the Media Stream tabulation.
Below contrast the practical video conference system, use the change of the present invention front and back system scale, user interactions quality.Before using this invention, the forward node of original system structural support distributed deployment arbitrary number in single multicast isolated island, for providing, the user inserts and the data forwarding service, with respect to traditional server/customer end model, the a plurality of forward node concurrent workings of this structural support, support multicast to insert simultaneously, therefore bigger improvement has been arranged.To illustrate below and use the designed further improvement that transmission structure brought of the present invention.Set single network interfaces utilized bandwidth 50Mbps, the user uplink Media Stream is 500kbps, subscribes to 3 road other user media streams.Original structure can only be carried out the IP multicast in single multicast isolated island, setting single multicast access user ratio is about 3:1. and uses two network interfaces of each node configuration in the system of the present invention, owing to support a plurality of multicast isolated islands, set single multicast insert user's ratio be 1:1. as shown in Figure 4, system's access capability has improved 120%～150%.The present invention is original 1/2～1/3 with postponing to be reduced to, and has obviously reduced packet loss between the different operators user, thereby has significantly improved the real time flow medium interactive quality, as Fig. 5, shown in Figure 6.
Compare with external MECCANO project, the disposal ability of the IAD that the present invention proposes and scale approximately are 6 times of MECCANO project.
Using video conferencing system of the present invention repeatedly is applied in the video conference of the Ministry of Education, the Department of Science and Technology.In the Ministry of Education, surpass the responsible educational institution of 150 universities and each provinces and cities, used the collaborative and meeting platform of this system as Ministry of Education inside.Proved actual effect.
What may be obvious that for the person of ordinary skill of the art draws other advantages and modification.Therefore, the present invention with wider aspect is not limited to shown and described specifying and exemplary embodiment here.Therefore, under situation about not breaking away from, can make various modifications to it by the spirit and scope of claim and the defined general inventive concept of equivalents thereof subsequently.
Claims (6)
1. the implementation method of a large-scale stream media transmission structure, it is characterized in that: described transmission structure is made up of the medium forward node that is deployed in any amount in numerous IP multicast isolated islands and unique forward node controller, medium forward node access user terminal under the control of forward node controller wherein, described user terminal comprises multicast user and unicast user, the multicast isolated island of having disposed unique forward node controller is called as main multicast isolated island, other multicast isolated islands are called as neighbours' multicast isolated island, the medium forward node can be installed the polylith network interface, each network interface can be linked into same multicast isolated island or different multicast isolated island arbitrarily, and the performing step of described transmission structure is as follows:
(1) each medium forward node starts back multicast transmission periodic heartbeat message in the multicast isolated island, to determine each medium forward node type: if the all-network interface of medium forward node is all received this heartbeat message, then this medium forward node type is main isolated island isolated node, if the all-network interface of medium forward node all can not receive this heartbeat message, then this medium forward node type is neighbours' isolated island isolated node, if the medium forward node has the subnetwork interface to receive this heartbeat message, and part can not receive, and then this medium forward node type is alternative connection node;
(2) each medium forward node sends heartbeat message after the type of determining self, to determine that the medium forward node is at each multicast isolated island distribution situation, i.e. topological structure;
(3) each multicast isolated island elects aggregation node, and aggregation node comprehensive multicast isolated island topological structure and nodal information are submitted to the forward node controller, and the forward node controller is known global Topological Structure thus;
(4) to each initiate user terminal, the forward node controller is according to the global Topological Structure of knowing, adopting the automatic cut-in method of user is certain suitable medium forward node of this user terminal selecting;
(5) after user terminal inserts, to each newly-built session, each neighbours' multicast isolated island elects and is communicated with node or agent node, be responsible for the data interchange between each neighbours' multicast isolated island and main multicast isolated island, each is communicated with between node and each agent node, or between each agent node, or cooperatively interact between the connection node, according to the multi-medium data retransmission method data message that this user terminal sent correctly is delivered to other user terminals of this session.
2. the implementation method of large-scale stream media transmission structure according to claim 1, it is characterized in that: wherein step (2) further comprises:
(a) medium forward node all-network interface multicast transmitting-receiving heartbeat message, the heartbeat message content comprises node type, start-up time and loading condition;
(b) at definite each network interface of medium forward node after each multicast isolated island distribution situation, continue to represent this medium forward node in this multicast isolated island, to receive and dispatch heartbeat message with medium forward node network interface address reckling in each multicast isolated island, other medium forward node network interfaces then stop to send, to reduce the message expense.
3. the implementation method of large-scale stream media transmission structure according to claim 1, it is characterized in that: wherein step (3) further comprises:
(a) the periodic heartbeat message that each medium forward node multicast sends in the multicast isolated island is received by other all medium forward node in this isolated island;
(b) after each medium forward node was received the heartbeat message of other medium forward node in the multicast isolated island, election start-up time, medium forward node the earliest was an aggregation node;
(c) aggregation node is according to each medium forward node heartbeat message in the multicast isolated island, and type, start-up time, loading condition, the network interface information clean culture of each medium forward node send the forward node controller in the comprehensive multicast isolated island.
4. the implementation method of large-scale stream media transmission structure according to claim 1, it is characterized in that: the automatic cut-in method of user of described step (4) is achieved as follows:
(a) user terminal obtains medium forward node multicast and sends the address of heartbeat message and monitor heartbeat message in this address by configuration file;
(b) if described user terminal is received the heartbeat message of any medium forward node, then show in the multicast isolated island of user terminal place and disposed the medium forward node, this user terminal will be received and dispatched message by multicast, and by the state of the aggregation node monitoring users terminal of place multicast isolated island, user terminal is so far finished access; Otherwise continue next step;
(c) whether user terminal has medium forward node and user terminal to belong to same Virtual network operator by the inquiry of forward node controller, if such node is arranged, the forward node controller will return the lightest node of wherein load and corresponding network interface IP address thereof, this user terminal will be by this forward node network interface clean culture transmitting-receiving message, and by the state of this node monitoring users terminal, user terminal is so far finished access; Otherwise, continue the step down;
(d) user terminal is by the lightest medium forward node of forward node controller query load, user terminal is by sending bandwidth, the round-trip delay between test packet detection and these medium forward node then, be less than or equal to the node of selecting the bandwidth maximum the medium forward node of setting time delay from round-trip delay, user terminal will be by this medium forward node clean culture transmitting-receiving message, and monitor the state of this user terminal by this medium forward node, this user terminal is so far finished access; If round-trip delay is less than or equal to the medium forward node of setting time delay and does not exist, then point out the user to insert.
5. the implementation method of large-scale stream media transmission structure according to claim 1, it is characterized in that: wherein step (5) further comprises:
(a) if be deployed with alternative connection node in neighbours' multicast isolated island, the lightest alternative connection node of then described neighbours' multicast isolated island internal burden is elected as the connection node, is responsible for neighbours' multicast isolated island and main isolated island data forwarding;
(b) if do not dispose alternative connection node in neighbours' multicast isolated island, the lightest node of then described neighbours' multicast isolated island internal burden is elected as agent node, agent node is inquired about the lightest node of load in the main multicast isolated island by the forward node controller, the agent node clean culture is connected to this medium forward node, and data will be transmitted by this clean culture between neighbours' multicast isolated island and main isolated island;
(c) directly realize exchanges data by multicast between main multicast isolated island node, realize indirectly and the exchange of neighbours' multicast isolated island node data by above-mentioned connection node and agent node.
6. the implementation method of large-scale stream media transmission structure according to claim 1, it is characterized in that: the multi-medium data retransmission method in the described step (5) is achieved as follows:
(a) after main isolated island isolated node or neighbours' isolated island isolated node multicast received message, clean culture was transmitted to all clean cultures of this medium forward node and inserts the user;
(b) after main isolated island isolated node or the clean culture of neighbours' isolated island isolated node received message, clean culture was transmitted to the every other clean culture of this node and inserts the user, and this message of multicast forwarding;
(c) after connection node multicast receives message, clean culture is transmitted to the every other clean culture of this node and inserts the user, if receive this message from main multicast isolated island, then to being responsible for neighbours multicast isolated island multicast forwarding, if receive this message, then transmit to main multicast isolated island from being responsible for neighbours multicast isolated island;
(d) after the clean culture of connection node received message, clean culture was transmitted to the every other clean culture of this node and inserts the user, and to the main multicast isolated island and this message of neighbours' multicast isolated island multicast forwarding of being responsible for;
(e) after alternative connection node received message from main multicast isolated island multicast, clean culture was transmitted to the every other clean culture of this node and inserts the user, will abandon for the message that receives from neighbours' multicast isolated island multicast;
(f) after the clean culture of alternative connection node received message, clean culture was transmitted to the every other clean culture of this node and inserts the user, and transmits this message to main multicast isolated island.
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| WO2012090993A1 (en) * | 2010-12-28 | 2012-07-05 | 日本電気株式会社 | Information system, control device, communication method and program |
| CN102075576A (en) * | 2011-01-10 | 2011-05-25 | 华中科技大学 | Distributed cooperative transmission method in embedded environment |
| CN104780562B (en) * | 2014-01-13 | 2018-09-25 | 中国联合网络通信集团有限公司 | A kind of method, apparatus and system of processing data |
| CN104506441B (en) * | 2014-12-30 | 2016-06-08 | 深圳市艾迪思特信息技术有限公司 | A kind of streaming media data stream method of sending and receiving |
| CN108632066B (en) * | 2017-03-21 | 2022-09-09 | 中兴通讯股份有限公司 | Method and device for constructing video multicast virtual network |
| CN110708244A (en) * | 2019-09-27 | 2020-01-17 | 杭州安恒信息技术股份有限公司 | Intelligent routing and scheduling method for cloud protection engine nodes |
| CN114866464B (en) * | 2022-05-18 | 2023-10-27 | 深圳市艾迪思特信息技术有限公司 | System for automatically discovering IP multicast domain and multicast proxy node |
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| CN1592250A (en) * | 2003-09-03 | 2005-03-09 | 北京鼎视通软件技术有限公司 | Flow medium data multi-point transmission method |
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| CN1592250A (en) * | 2003-09-03 | 2005-03-09 | 北京鼎视通软件技术有限公司 | Flow medium data multi-point transmission method |
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