CN101394423A - Media positioning, searching method and system - Google Patents
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Abstract
The invention provides a media location and searching method and a system. Based on node dependence and network topologic information, the method relates to a CDN Manager/CDN Agent and peer nodes. The CDN Manager/CDN Agent at least comprises node dependence information, network topologic information and media location information, and a global manager and a local agent CDN Manager/CDN Agent acquire the node dependence information and the network topologic information of each peer node in a service range to generate a physical network topologic graph. A physical network topologic information library is constructed in the network topologic server, and a media state library is established in the global manager and the local agent CDN Manager/CDN Agent. The method can fully exert the advantages of P2P technology, and can improve the delivery efficiency and speed of IPTV media.
Description
Technical field:
The present invention relates to the IPTV field, specifically, the present invention relates to a kind of P2P of utilization technology, and node relies on and network topological information the method and system of realization IPTV medium location, search.
Background technology:
At present, the media delivery system field in the IPTV system, adopt two class methods usually: (1) is based on traditional C DN technology; (2) based on the P2P distributed computing technology.
Media delivery system field in the IPTV system, also having attempts CDN technology and P2P technology combined carries out the media content search, the server buffers node promptly is set in the P2P network (can be online for a long time, reliability, service ability, port speed are all than user terminal height), this is a kind of IPTV media delivery system of mixing.The CDN technology is based on traditional client/server (C/S) pattern, and be used in combination agency/caching technology, this technology is applied to WEB service, VOD service the earliest, Deng, but, usually be limited by the disposal ability of server and port speed etc., thereby have irremediable significant deficiency aspect userbase of being served and the region covering.
The appearance of P2P technology has solved the predicament that the CDN technology is faced, can infinite expanding on userbase.Then approach the acceptable degree of user at aspect of performance, the application that this respect influence is bigger, for example, Web TV PPLIVE, file are downloaded BitTorrent, and IP phone Skype.
The development source of P2P technology arises from stacked network (OVERLAY NETWORK), and this network breaks away from the logical network in concrete physical network.It is based on different application, different participation entities makes up, thereby network topology structure uses the Performance And Reliability paid close attention to and different according to concrete, and tree-shaped (tree) structure and netted (mesh) structure are arranged usually.
The node of artificial setting relies on and the topological structure of physical network because the P2P network has been ignored, thereby can the network of reality be exerted an influence.For example, in existing IPTV media delivery system, the method for document copying is all adopted in distribution and the scheduling of media file in the IPTV media delivery system, has only by the time after a document copying is finished, and just can flow service.For example, two nodes are arranged in same physical network, thereby but are in the P2P network in the different branches of different logical topology tree, so these two nodes will communicate by letter, must be through the different nodes in two branches; Again for example, in a single day some node can not satisfy the content that the user asks, and directly specifies (perhaps relying on) to obtain to another node artificially, yet, these two nodes but do not have neighborhood, in other words conj.or perhaps " neighbours " relation of a kind of " manually " setting.Existing P 2P technology is not considered the situation of the information that the node behind the media file burst relies on.
Summary of the invention:
1, technical problem
Technical problem to be solved by this invention is, overcome the deficiency of existing CDN technology and P2P technology, node is relied on and the physical network feature combines with the P2P technology, thereby a kind of medium location, searching method and system of the IPTV system based on CDN and P2P technology are provided.
2, summary of the invention
The invention provides a kind of medium localization method, this method relies on and network topological information based on node, relate to CDN Manager/CDN Agent and peer node, described CDN Manager/CDN Agent comprises that at least node relies on information, network topological information and media location information.This method comprises:
Step 1, the node that global administration's device, local agent CDN Manager/CDN Agent obtain each peer node in the service range relies on information and network topological information, and described network topological information comprises the IP address;
Step 2 according to the IP address information that obtains in the step 1, generates the physics network topological diagram;
Step 3 is set up the physical network topology information storehouse in the network topology server, the described node that obtains in the step 1 is relied on the described physical network topology figure that generates in information and network topological information and the step 2 store in the described physical network topology information storehouse;
Step 4, in global administration's device, local agent CDN Manager/CDN Agent, set up the media state storehouse, the media status information of various media contents on the storage networking in described media state storehouse, described media status information comprises the IP address of the peer node at content name and content place.
Described node dependence information comprises that node neighbor information, dependence node IP, the quilt of artificial setting are relied on node IP information, described network topological information comprises IP address, geographical position, is subordinate to unit, administrative staff's information, the IP address of described peer node obtains by using snmp protocol, CMIP protocol network management agreement, perhaps uses the mode of human configuration to obtain.
Described physical network topology figure comprises annexation, the IP address between the node.
The state information of various media contents comprises the IP address of the peer node at content name and content place on the storage networking in described media state storehouse.
Periodic maintenance is carried out in described media state storehouse, and this method comprises the steps:
Step 1, described peer node regularly arrive global administration's device, local agent CDN Manager/CDN Agent to all media content state feedback in this node;
Step 2, media index server be according to each peer node feedack, regular update media content state repository.
The present invention also provides a kind of and has utilized described medium localization method to carry out the media research method, it is characterized in that this method comprises:
Step 1 supposes that a certain peer node is that content is obtained node, and described content is obtained node and sent the request of obtaining a certain media content to global administration's device, local agent CDN Manager/CDN Agent;
Step 2 after the request that described global administration device, local agent CDN Manager/CDN Agent send in receiving step 1, is retrieved in the media state storehouse, finds out the current address that all peer node of described certain content are provided;
Step 3 in the described peer node address that step 2 finds, sorts by the optimal service principle, gets top n address after the ordering as service list;
Step 4, described global administration device, local agent CDN Manager/CDN Agent obtain node to described content and return described optimal service tabulation;
Step 5, described content are obtained the address that node provides according to described optimal service tabulation, and the peer node in described optimal service tabulation is sent content acquisition request and received and/or use content.
The described title that comprises the certain content that need obtain in the request of obtaining, described content name is words identification, numbering or additional character.
Described optimal service tabulation affix relies on node, and comes the foremost of described optimal service tabulation.
When 1 in the tabulation of described optimal service or several peer node roll off the production line, apply for described optimal service tabulation to described CDNAgent again.
Described CDN Manager/CDN Agent regularly detects the presence of described peer node, when finding a certain described peer node off-line, then upgrades the state table that data file can be provided, and removes the described peer node that rolls off the production line.
When described content is obtained node after data file is transferred to this locality fully, described CDNManager/CDN Agent obtains described content in the service available state table that node joins data file.
The present invention also provides a kind of media delivery system, and described system comprises switch, global administration's device, local agent CDN Manager/CDN Agent, media server, network topology server, node reliance server, peer node, wherein,
Described media server is used for the relay television direct broadcast band, and store media files and channel stream are to realize TVOD and time-moving television;
Described node reliance server, the node that is used for each peer node in the stores service scope relies on information;
Described network topology server is used for the storage networking topology information base;
Described global administration device, local agent CDN Manager/CDN Agent, the node that is used to obtain each peer node in the service range relies on information and network topological information;
Described in addition global administration device, local agent CDN Manager/CDN Agent comprise again:
The media index server is used for obtaining network topological information from the network topology server, and sets up the media state storehouse;
Described global administration device, local agent CDN Manager/CDN Agent, node reliance server, network topology server, media server are connected with center switch respectively, and described peer node is connected with center switch by the I and II switch.
3, beneficial effect
The present invention relies on node and combines with the P2P technology, has given full play to the advantage of P2P technology, has improved IPTV media delivery efficient and speed.
Description of drawings:
Fig. 1 is that the present invention utilizes node to rely on the P2P schematic network structure of information and network topology structure;
Fig. 2 is an application scenarios schematic diagram of media delivery system P2P network of the present invention;
Fig. 3 is medium localization method flow chart of the present invention;
Fig. 4 is media research method flow diagram of the present invention;
Fig. 5 is the maintaining method flow chart in media state of the present invention storehouse.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples:
The English that comprises in this explanation is called for short as follows:
P2P:Peer to Peer peer-to-peer network
IPTV:Internet Protocol Television Internet TV.
EPG:Electronic Programmer Guide electronic program list.
CDN:Content Delivery Network content delivery network.
FTP：Fi?le?Transfer?Protocol。File transfer protocol (FTP).
DHT:Distributed Hash Table distributed hashtable
MSD:Media Segment Di stributing is based on the content release of media segment (or burst)
VOD:Video On Demand video request program
TSTV:Time Shift TV time-moving television
TVOD:TV On Demand recorded broadcast
STB (Set-Top-Box) set-top box
System configuration comprises network topology server, global administration's device, local agent CDNManager/CDN Agent, node reliance server and peer node among Fig. 1; Wherein global administration's device, local agent CDN Manager/CDN Agent one end connect the network topology server, carry out the transmission of network topological information between them, and an end connected node reliance server carries out node and relies on transmission of Information between them; Local agent CDN Manager/CDN Agent is connected with peer node simultaneously, the media status information of the various media contents of transmission between them.
Embodiment 1:
As Fig. 1 and Fig. 3, said here " node dependence " is meant: the service providing node that this node is standby may not be the neighbor node of this node; Only when this node can not provide service to the user, just the dependence node by this node provided service to the user for it.
The medium localization method that present embodiment provides, its step is as follows:
Step 1, the node that CDN Manager/CDN Agent obtains each peer node Peer in the service range relies on information and network topological information, described node dependence information comprises that dependence node IP, quilt are relied on information such as node IP, and described network topological information comprises IP address, geographical position, is subordinate to unit, administrative staff etc.; The IP address of each peer node Peer can obtain by using NMPs such as snmp protocol, CMIP agreement, also can use the mode of human configuration to obtain.
Step 2 according to the IP address information that obtains in the step 1), generates the physics network topological diagram, comprises annexation, IP address between the node among this figure;
Step 3, in the functional network topology module of CDN Manager/CDN Agent, set up the physical network topology information storehouse, with the information and the steps 2 such as IP address of each peer node of obtaining in the step 1)) in the physical network topology figure that generates store in the physical network topology information storehouse;
Step 4 is set up the resource status storehouse in CDN Manager/CDN Agent, the state information of various media contents on the storage networking in this media state storehouse; This media content state information comprises the IP address of the peer node at content name and content place;
Table 1, table 2 are to be the media content state information storage format of example with the file, and wherein table 1 is the general information table, and table 2 is media state tables.
| The media content title | The hero |
| Block size (unit: M) | 5 |
| Total block data | 400 |
Table 1
| Piece number | Deposit position |
| 1 | 10.?40.?4.?1、?10.?40.?1.8 |
| 2 | 10.?40.?8.?1、?10.?40.?4.1 |
| … | … |
Table 2
As Fig. 5, the media content state repository can be carried out regular maintenance in addition, and maintaining method comprises the steps:
Step 1, each peer node regularly arrive CDNManager/CDN Agent to all media content state feedback in this node.
Step 2, CDN Manager/CDN Agent is according to each peer node feedack, regular update media content state repository.
Embodiment 2:
As Fig. 1 and Fig. 4, the media research method that present embodiment provides comprises the steps:
1) some peer node are that content is obtained node, this content is obtained node and is sent the request of obtaining a certain certain content to the media index server of CDN Agent, the title that comprises the certain content that need obtain in this request (for example, film: the hero), this title can words identification, numbering, additional character etc., for the ease of understanding, the peer node of acquisition request content is here called content obtain node;
2) after the request that CDN Agent sends in receiving step 1), in the media content state repository, retrieve, find out the current address that all the elements peer node of described specific media content is provided;
3) in step 2) in the peer node address that finds, sort by principle of optimality, get the node listing of top n address, and affix relies on node, and come the foremost of this tabulation as optimal service;
4) CDN Agent obtains node to content and returns neighbor list;
5) content is obtained the address that node provides according to the tabulation of optimal service node, and the peer node on this node listing is sent content acquisition request and received or use resource.
It should be noted that when 1 in the optimal service node listing or several peer node roll off the production line, then again to the tabulation of CDN Agent application optimal service.
Embodiment 3: present embodiment relies on information and network topological information based on node, node is relied on information and network topological information combines with the P2P network, particularly node dependence information is applied to the media delivery of IPTV system.
Fig. 2 is an application scenarios of media delivery system of the present invention, and it is a subzone network of being made up of switch, on physical network, described network topology server, CDN Agent and peer node in the figure distribution.Described system comprises switch, global administration's device, local agent CDN Manager/CDN Agent, media server, network topology server, node reliance server, peer node, wherein,
Described media server is used for the relay television direct broadcast band, and store media files and channel stream are to realize TVOD and time-moving television;
Described node reliance server, the node that is used for each peer node in the stores service scope relies on information;
Described network topology server is used for the storage networking topology information base;
Described global administration device, local agent CDN Manager/CDN Agent, the node that is used to obtain each peer node in the service range relies on information and network topological information;
Described in addition global administration device, local agent CDN Manager/CDN Agent comprise again:
The media index server is used for obtaining network topological information from the network topology server, and sets up the media state storehouse;
Described global administration device, local agent CDN Manager/CDN Agent, node reliance server, network topology server, media server are connected with center switch respectively, and described peer node is connected with center switch by the I and II switch.
In the present embodiment, peer node also can provide service when enjoying download.
The network operation is prepared: as the initial part of system, at first need the network topology server prepares, for the simplification process, the subzone network topology of supposing switch is by outside BOSS system or manual being input in the network topology server in the present embodiment.The initialization of CDN Agent: obtain network topological information from the network topology server, simultaneously, the information of data resource is set up index in CDN Agent.Suppose that the P2P system is after operation a period of time, the distribution of data message reaches following state: data file " hero " is storage fully in peer node 2,3,5,6,7, send data file " hero's " request in moment t peer node 1, below in conjunction with this situation descriptive information reciprocal process:
Step 1, peer node 1 is to the CDN Agent request of sending (request msg file " hero ");
Step 2, CDN Agent is according to network topological information and optimal service principle, and the address list of peer node 2,3 is sent to peer node 1 (hypothesis is returned 2 neighbor lists) here;
Step 3, peer node 1 according to optimal service tabulation respectively from the different piece of resource peer node 2,3 transmission data files " hero ";
Step 4 is supposed in document transmission process, peer node 3 off-lines, it is unsuccessful that peer node 1 detects file transfer, the node listing of the optimal service that please look for novelty to CDN Agent then, the optimal service node that at this moment returns is a peer node 7, rather than peer node 5 or 6;
Step 5, CDN Agent regularly detects the presence of peer node, finds peer node 3 off-lines here, and then the state table that service can be provided of updated data file " hero " removes peer node 3; Simultaneously, after data file " hero " was transferred to this locality fully, CDN Agent joined it in service available state table of data file " hero " in peer node 1.
In existing IPTV media delivery system, the method for document copying is all adopted in distribution and the scheduling of media file in the IPTV media delivery system, has only by the time after a document copying is finished, and just can flow service.Yet in the described IPTV media delivery system of the present invention institute, media file is cut into a plurality of bursts, and is stored in a plurality of servers in the IPTV media delivery system.The IPTV media delivery system need position management to burst, when the user asks to play a film, the IPTV media delivery system retrieves burst in order, and play (for to the storage of the stream of each node with the user is flowed the accurate control of transmission by the Play Control requirement, can transmit the information index file of this stream before the stream exchange of the streaming server node in the IPTV media delivery system, possible information comprises: average frame interval, medium type, frame distributed intelligence etc.).
Claims (13)
1, a kind of medium localization method is characterized in that, comprising:
Step 1, the node that global administration's device, local agent CDN Manager/CDN Agent obtain each peer node in the service range relies on information and network topological information, and described network topological information comprises the IP address;
Step 2 according to the IP address information that obtains in the step 1, generates the physics network topological diagram;
Step 3 is set up the physical network topology information storehouse in the network topology server, the described node that obtains in the step 1 is relied on the described physical network topology figure that generates in information and network topological information and the step 2 store in the described physical network topology information storehouse;
Step 4, in global administration's device, local agent CDN Manager/CDN Agent, set up the media state storehouse, the media status information of various media contents on the storage networking in described media state storehouse, described media status information comprises the IP address of the peer node at content name and content place.
2, medium localization method according to claim 1, it is characterized in that, described node dependence information comprises that node neighbor information, dependence node IP, the quilt of artificial setting are relied on node IP information, described network topological information comprises IP address, geographical position, is subordinate to unit, administrative staff's information, the IP address of described peer node obtains by using snmp protocol, CMIP protocol network management agreement, perhaps uses the mode of human configuration to obtain.
3, medium localization method according to claim 1 is characterized in that, described physical network topology figure comprises annexation, the IP address between the node.
4, medium localization method according to claim 1 is characterized in that, the state information of various media contents comprises the IP address of the peer node at content name and content place on the storage networking in described media state storehouse.
According to any medium localization method of claim 1 to 4, it is characterized in that 5, periodic maintenance is carried out in described media state storehouse, this method comprises the steps:
Step 1, described peer node regularly arrive global administration's device, local agent CDN Manager/CDN Agent to all media content state feedback in this node;
Step 2, media index server be according to each peer node feedack, regular update media content state repository.
6, a kind of described medium localization method of claim 1 that utilizes carries out the media research method, it is characterized in that this method comprises:
Step 1 supposes that a certain peer node is that content is obtained node, and described content is obtained node and sent the request of obtaining a certain media content to global administration's device, local agent CDN Manager/CDN Agent;
Step 2 after the request that described global administration device, local agent CDN Manager/CDN Agent send in receiving step 1, is retrieved in the media state storehouse, finds out the current address that all peer node of described certain content are provided;
Step 3 in the described peer node address that step 2 finds, sorts by the optimal service principle, gets top n address after the ordering as service list;
Step 4, described global administration device, local agent CDN Manager/CDN Agent obtain node to described content and return described optimal service tabulation;
Step 5, described content are obtained the address that node provides according to described optimal service tabulation, and the peer node in described optimal service tabulation is sent content acquisition request and received and/or use content.
7, media research method according to claim 6 is characterized in that, the described title that comprises the certain content that need obtain in the request of obtaining, and described content name is words identification, numbering or additional character.
8, media research method according to claim 6 is characterized in that, described optimal service tabulation affix relies on node, and comes the foremost of described optimal service tabulation.
9, according to claim 6,7,8 described media research methods, it is characterized in that, when 1 in the tabulation of described optimal service or several peer node roll off the production line, apply for described optimal service tabulation to described CDN Agent again.
10, according to claim 6,7,8 described media research methods, it is characterized in that, described CDN Manager/CDNAgent regularly detects the presence of described peer node, when finding a certain described peer node off-line, then upgrade the state table that data file can be provided, remove the described peer node that rolls off the production line.
11, according to claim 6,7,8 described media research methods, it is characterized in that, when described content is obtained node after data file is transferred to this locality fully, described CDN Manager/CDN Agent obtains described content in the service available state table that node joins data file.
12, a kind of media delivery system is characterized in that, described system comprises switch, global administration's device, local agent CDN Manager/CDN Agent, media server, network topology server, node reliance server, peer node, wherein,
Described media server is used for the relay television direct broadcast band, and store media files and channel stream are to realize TVOD and time-moving television;
Described node reliance server, the node that is used for each peer node in the stores service scope relies on information;
Described network topology server is used for the storage networking topology information base;
Described global administration device, local agent CDN Manager/CDN Agent, the node that is used to obtain each peer node in the service range relies on information and network topological information;
Described global administration device, local agent CDN Manager/CDN Agent, node reliance server, network topology server, media server are connected with center switch respectively, and described peer node is connected with center switch by the I and II switch.
13, media delivery system according to claim 12 is characterized in that, described global administration device, local agent CDN Manager/CDN Agent comprise:
The media index server is used for obtaining network topological information from the network topology server, and sets up the media state storehouse.
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| CN107667513A (en) * | 2015-09-04 | 2018-02-06 | 谷歌有限责任公司 | System and method for remote topology discovery |
| CN107667513B (en) * | 2015-09-04 | 2021-04-27 | 谷歌有限责任公司 | System and method for remote network topology discovery |
| US11108883B2 (en) | 2015-09-04 | 2021-08-31 | Google Llc | Systems and methods for remote network topology discovery |
| US11394800B2 (en) | 2015-09-04 | 2022-07-19 | Google Llc | Systems and methods for remote network topology discovery |
| WO2017185614A1 (en) * | 2016-04-25 | 2017-11-02 | 乐视控股（北京）有限公司 | Route selection method and electronic device |
| CN111245577A (en) * | 2018-11-29 | 2020-06-05 | 中国电信股份有限公司 | Data transmission method, system and related equipment |
| CN111245577B (en) * | 2018-11-29 | 2023-02-03 | 中国电信股份有限公司 | Data transmission method, system and related equipment |
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