CN1878117B - Communication method of combining hierarchical structure peer-to-peer network and session initiation protocol - Google Patents
Communication method of combining hierarchical structure peer-to-peer network and session initiation protocol Download PDFInfo
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Abstract
The invention discloses a connection graded structure image network and communication method of conversational promotional protocol, which comprises the following steps: (1) adopting relative protocol according to local grade covering network for image network node of applied switch-in graded structure; executing the register of local grade covering network; (2) generating uniform resource locating symbol for user according to conversational promotional protocol regional name scale of graded structure image network; (3) making each local grade covering network possess certain quantity node as deputy server of local grade covering network; registering higher grade covering network to realize communication of different image network; (4) disposing the calling request through local grade covering network or higher grade covering network.
Description
Technical field
The present invention relates to the staging hierarchy of peer-to-peer network Session initiation Protocol, be meant that especially the peer-to-peer network that utilizes classification provides location-based service for Session initiation Protocol, and utilize the Session initiation Protocol signaling to realize the implementation method of intercommunication between different types of peer-to-peer network.
Background technology
Session initiation Protocol is widely used in the multi-media network session control, and the extensibility of its height makes its status as following multi-media network signaling protocol firm day by day.Simultaneously, peer-to-peer network is devoted to share computer resource and service by the reconstruct between the application layer host as the overlay network of existing the Internet, realized complete distributed, reliable, can expand, healthy and strong network application mode.Therefore, some particular network are used (for example video conference in the self-organizing network on a small scale) and are impelled us to study the combination of Session initiation Protocol and peer-to-peer network, and the acting in conjunction of trying hard to by Session initiation Protocol and peer-to-peer network provides healthy and strong more service for the network control in future.
The deployment of current Session initiation Protocol and maintenance all are to rely on son that the infrastructure at center is arranged, the territory of each Session initiation Protocol all needs special server as acting server, so not only increase the cost of disposing and safeguarding greatly, and under the disabled situation of server, can produce the problem of single point failure.Simultaneously, some specific application needs can be set up network (for example emergency relief situation and local video conference) fast among a small circle, are difficult to satisfy such demand based on the Session initiation Protocol of infrastructure deployment.Therefore, it is as follows the session initiation protocol to be expanded to the meaning of application model at first center:
1, acentric Session initiation Protocol will be healthy and strong more, to adapt to the application demand under the self-organizing environment.
2, acentric Session initiation Protocol will not rely on infrastructure, thereby realize fast, disposes cheaply and safeguard.
At present, the work of merging about Session initiation Protocol and peer-to-peer network mainly is divided into two classes, and a class is based on the peer-to-peer network of Session initiation Protocol, promptly safeguards peer-to-peer network with the Session initiation Protocol signaling, node and resource management in the realization peer-to-peer network.The another kind of Session initiation Protocol that is based on peer-to-peer network promptly utilizes peer-to-peer network to come to provide location-based service for Session initiation Protocol.
Peer-to-peer network for dialogue-based initiation protocol, owing to be to utilize the signaling of Session initiation Protocol to realize the maintenance of peer-to-peer network, so do not need to change the semanteme of conversation launch protocol message, but have the conversation launch protocol message of state will bring huge expense.According to incompletely statistics, node of registration in the peer-to-peer network of dialogue-based initiation protocol, front and back need to surpass 17 kinds of conversation launch protocol messages.For Session initiation Protocol based on peer-to-peer network, owing to utilized peer-to-peer network to provide location-based service for it, so significantly reduced the expense of signaling in the process that connects, yet the cost of doing so then is the interoperability of having sacrificed Session initiation Protocol, because the peer-to-peer network of different institutions design all has the agreement of oneself, be difficult to require dissimilar peer-to-peer networks all to accept identical hash algorithm and standard criterion in short time, so just can only realize the intercommunication of single peer-to-peer network inside, thereby run counter to Session initiation Protocol and utilized domain name system can realize the design original intention of whole the Internet intercommunication signaling.
We can say how current two kinds of methods in conjunction with Session initiation Protocol and peer-to-peer network, adopt a kind of better scheme to promote that both fusions are the task of top priority if cutting both ways.
Summary of the invention
In view of this, main purpose of the present invention is to provide the communication means of a kind of combining hierarchical structure peer-to-peer network and Session initiation Protocol, to guarantee the above-mentioned two kinds of schemes of combined optimization.
According to the present invention, the communication means of a kind of combining hierarchical structure peer-to-peer network and Session initiation Protocol is provided, may further comprise the steps:
(1) application inserts the related protocol of the node of hierarchy peer-to-peer network according to overlay network employing at the corresponding levels, carries out the registration of overlay network at the corresponding levels, and wherein application inserts the node of hierarchy peer-to-peer network for moving the node of dual stack;
(2), produce user's URL(uniform resource locator), thereby realize the resource registering of Session initiation Protocol according to the domain name standard of the Session initiation Protocol of hierarchy peer-to-peer network;
(3) make each overlay network at the corresponding levels all have the node of some to become the acting server of overlay network at the corresponding levels, be registered to higher leveled overlay network, thereby make different peer-to-peer networks communicate;
In step (3), also comprise step: adopt candidate's acting server tabulation mechanism, titular equipment is listed in the tabulation of candidate's acting server, wherein titular node is the online for a long time of some, and the node with reliable bandwidth
(4) for any call request, what overlay network at the corresponding levels can be handled is just handled by overlay network at the corresponding levels, and overlay network at the corresponding levels is not handled, and then transfers to high one-level overlay network and handles.
Preferably, according to the order of priority, choose the acting server in described candidate's acting server tabulation.
Preferably, the information that is registered to higher leveled overlay network in the step (3) is the network information at the corresponding levels of described acting server representative.
Preferably, by in any one time, overlay network at the corresponding levels has an acting server at least, safeguards described candidate's acting server tabulation.
Preferably, step (1) also comprises step:
After overlay network registration at the corresponding levels, described overlay network at the corresponding levels is stored described IP addresses of nodes and resource information at described node, thereby described node is realized communicating by letter with other nodes in the described overlay network at the corresponding levels.
Preferably, the node that is registered in the overlay network at the corresponding levels is given current acting server with its other resources situation report, and acting server is set the priority of these nodes thus, and safeguards described candidate's acting server tabulation.
Preferably, step (3) also comprises step:
Become the acting server of corresponding overlay network at the corresponding levels and after being registered to higher leveled overlay network, with all nodes of notifying in the corresponding overlay network at the corresponding levels, these notified nodes are with the address information of caching proxy server at node.
Preferably, become the node of acting server will be automatically deletion from the tabulation of candidate's acting server, remaining both candidate nodes moves forward successively, adds the new both candidate nodes with the acting server equal number, realizes the renewal of candidate's acting server tabulation;
Wherein said acting server tabulation is safeguarded by the node of each overlay network appointment.
Preferably, described URL(uniform resource locator) is based on the information that the user submits to and produces, and described URL(uniform resource locator) is that the overall situation is unique, and corresponding field comprises the information that can distinguish the territory, judges so that realize the domain name ownership.
Preferably, in step (3), the number of acting server and candidate's acting server depends on network condition and joint behavior situation in each local overlay network, and in view of the maintenance costs and the stability of high one-level overlay network, does not allow all nodes all to become acting server.
Preferably, the node that becomes acting server in step (3) will start two protocol registrations in higher leveled overlay network.
Preferably, in case acting server withdraws from, first node in the candidate's acting server tabulation will add higher leveled overlay network as new acting server, and each grade network all will start maintenance function and carry out redistributing of resource.
Preferably, described step (4) comprises step:
The caller node utilizes called node domain name to judge whether called node belongs to overlay network at the corresponding levels;
Belong to overlay network at the corresponding levels if judge called node domain name, use the location-based service of overlay network at the corresponding levels, called node is issued in call request;
Do not belong to overlay network at the corresponding levels if judge called node domain name, then hand to proxy server processes at the corresponding levels;
Acting server at the corresponding levels finds after the acting server of called node place network by high one-level overlay network, gives described acting server with call request, and described acting server is responsible for being transmitted to called node.
According to basic design of the present invention, on the basis of merging peer-to-peer network and Session initiation Protocol, realized classification mechanism.Under the prerequisite of not destroying current numerous peer network architectures, from each peer-to-peer network, choose the node of excellent performance, line duration length and form a top overlay network.These nodes will serve as the acting server of place overlay network on application layer, be responsible for the route work of message, realize the intercommunication between different overlay networks.The peer-to-peer network domain name system that adopts this method to utilize to design realizes the location-based service of conventional session initiation protocol based on name server, and when reducing peer-to-peer network and searching complexity, reduces the expense of Session initiation Protocol signaling.
Description of drawings
Fig. 1 is the network configuration of classification P2P-SIP of the present invention;
Fig. 2 is the architecture of classification P2P-SIP protocol stack of the present invention;
Fig. 3 is the initiation process and the corresponding signaling process of inter-domain call of the present invention.
Embodiment
The method according to this invention, each node that application inserts hierarchy P2P-SIP (hierarchy peer-to-peer network Session initiation Protocol) network all is a node that can move dual stack.Wherein the stack agreement corresponding to low one-level can start after the node registration automatically; And corresponding to upper level, just can make node become the stack agreement of place overlay network acting server then will be in standby condition.Whether enable and depend on according to the situation of other nodes and the performance of register node self.For the stability of whole system, and handle the situation that a plurality of nodes withdraw from and operating acting server withdraws from, any node all must be born the obligation (promptly be equipped with dual stack, but not necessarily move) that becomes acting server.
The node that application inserts is at first finished the information registration of self when starting place overlay network agreement, this information comprises self networks address and various resource, hierarchy P2P-SIP system must meet the peer-to-peer network domain name system standard of our design for the naming method of resource, thereby finish the mapping of peer-to-peer network domain name and traditional internet domain name, make the just son management of staging hierarchy of overlay network in the hierarchy P2P-SIP system, and then clear and definite in hierarchy P2P-SIP system the concrete function of various piece, set up the user registration of a cover based on the peer-to-peer network domain name system, information searching mechanism realizes the intercommunication between different overlay networks.
The name space of peer-to-peer network domain name and the form of traditional internet domain name are similar, the structure that has levels, and each node has 63 signs that character is long at the most.The tree root of this tree is the special joint without any sign.Do not distinguish upper case and lower case without exception in the name sign.The domain name of any one node will be contacted to top domain name from this node exactly on the naming tree, and the middle point ". " that uses is separated these domain names.Each node in the tree of domain names must have a unique domain name, but the different nodes in the tree of domain names can use identical sign.It is long that the length of whole domain name can not surpass 255 characters.
After the unique peer-to-peer network domain name of overall situation of node registration that each application inserts, just this domain name and its network address can be bound together, the distributed hash algorithm that utilizes the place overlay network to take is finished the information registration.Peer-to-peer network just can utilize fully certainly node and resource location algorithm to provide location-based service in overlay network inside for Session initiation Protocol based on the unique domain name of this overall situation.
In order to realize the intercommunication of Session initiation Protocol on peer-to-peer network of different nature, it is excellent relatively that each overlay network all can be chosen some performances, and the node of line duration length is as the acting server of this overlay network.The effect of this acting server just is equivalent to the effect of gateway for its overlay network inside, it not only finishes the registration process of an ordinary node, also to finish registration at higher leveled overlay network, what this time register is the coverage network information that acting server is responsible for, when the acting server of an overlay network outnumbers 1, the identical network information will be registered.In query script, system can all submit to the user with the whole satisfactory proxy server information of being looked for, and encloses the corresponding information of this acting server, is chosen on application by the user.Like this, acting server will move dual stack, and it is not only in the route of overlay network interior liabilities application layer, and be responsible for the intercommunication between the different overlay networks.
The higher leveled overlay network that acting server is formed has kept the individual character of the resource lookup agreement of each independent overlay network, therefore do not need to change the overlay network agreement that exists originally, increase the receptivity of this programme, and can utilize the covering scale of each peer-to-peer network at present.The plug-in unit that only needs to install hierarchy P2P-SIP just can utilize separately the overlay network own resources to search agreement and provide location-based service for Session initiation Protocol, and realizes not same area (being the signalling interworking between the different overlay networks).
The address information of acting server will be buffered on the overlay network of place on all nodes, when sending node need be got in touch with called node foundation, at first use in the domain name relevant information and judge that whether called node is with oneself being in the same overlay network, if belong to same overlay network, then utilize local overlay network agreement to make a call; If do not belong to same overlay network, then get in touch acting server in the overlay network of place, by this call request of proxy server processes, acting server finds the acting server of called node place overlay network on high one-level overlay network, and transmit this call request, finally called node is issued in this call request by the related protocol of called network, called node is obtained the network address of initiating node according to relevant field in the Session initiation Protocol signaling, utilizes the Session initiation Protocol signaling directly to set up Multimedia session with it.
In the such scheme, the node that application inserts can be a PC, perhaps possesses the mobile terminal node of respective capabilities.Acting server is necessary for excellent performance, the PC that line duration is long.
So method of hierarchy P2P-SIP architecture provided by the present invention, realized providing location-based service in the corresponding peer-to-peer network agreement of the inner utilization of single overlay network, and between different peer-to-peer networks the long node of the excellent performance by choosing out, line duration as acting server, form a higher leveled overlay network, they will serve as the router of place peer-to-peer network at application, the route work of information is searched in realization, and utilizes conversation launch protocol message to realize the intercommunication of different peer-to-peer networks.Thereby when having guaranteed to reduce the Session initiation Protocol signaling consumption, make full use of existing peer network resources and come, but the acceptance of raising scheme for Session initiation Protocol provides location-based service.
Specifically, for certain node being joined classification P2P-SIP overlay network, at first need to get in touch with a node that has moved (promptly starting node), modes such as that this step, we can use was pre-configured, website issue, broadcasting, provide just at operating nodal information, and enclose the evaluation of corresponding rank, select a metastable node as starting node to make things convenient for the user, and can determine the zone that will add according to the overlay network agreement that self adopts.
In general, as long as the user obtains starting IP addresses of nodes and port numbers just can propose to join request to this node, concrete step depends on DHT (DistrlbutedHash Table, the distributed hashtable) mode that is adopted.In general, be exactly the renewal of overlay network structure and redistributing of related resource.In case new node is finished adding work, just represent this node to be registered in the classification P2P-SIP system, corresponding resource (for example SIP URI) can be registered in the node of overlay network correspondence for other user inquirings.
After the each adding of node, the startup nodal information that the meeting buffer memory can be used adds fashionable can the application automatically again after withdrawing from.If the website is unreachable, and the node that does not have buffer memory to use.Can the applying broadcasting mode propose to join request to all machines that can reach, the P2P-SIP node that this information will moved receives, and finishes adition process.Thereby be pushed into overlay network at the corresponding levels.
In order to make the higher leveled overlay network can be more stable, this programme wishes to add higher level's node (being the equal network proxy server node) can be online for a long time, the performance of reliable bandwidth and excellence etc. is arranged, therefore, system need choose the both candidate nodes of a part (number is made as n) as the equal network proxy server from the ordinary node of overlay network, then choose m (m＜n) as the proxy server nodes that activates from these both candidate nodes.
Among the present invention at first definition to become the both candidate nodes condition as follows:
◆ in local overlay network, started and adding.
◆ got access to the unique node number of local overlay network (by Hash self IP address gained).
◆ can realize all functions set in the local overlay network.
◆ parameters such as the performance of self, bandwidth, line duration must satisfy or surpass default minimum requirements.
In the local overlay network each meets the obligated both candidate nodes that becomes automatically of node of above-mentioned condition, and choose the acting server of some according to the height of performance (taking all factors into consideration above-mentioned requirements) priority, though other both candidate nodes do not become acting server, obligatedly finish following task:
◆ the acting server both candidate nodes in each peer-to-peer network will be to the proxy server nodes (being exactly the node that adds high one-level overlay network) of this subdomain overlay network, reports the resource situation such as CPU, bandwidth of oneself.
◆ the resource situation of each both candidate nodes is (as online hours in the overlay network at its place of proxy server nodes supervision, bandwidth etc.), and safeguard a candidate node list (according to the performance priority arrangement) according to this, select the node broadcasts acknowledge message periodically backward, select node listing after wherein attaching.
◆ when the both candidate nodes in the overlay network does not receive the periodicity acknowledge message of proxy server nodes, think that then this proxy server nodes withdraws from, first node in the candidate list then adds higher leveled overlay network as new acting server.
Below with the adding and the maintenance of acting server and to finish processes such as intercommunication be example, 1 implementation method that specifies hierarchy peer-to-peer network Session initiation Protocol in conjunction with the accompanying drawings.
Fig. 1 is the network configuration of classification P2P-SIP of the present invention, and the present invention at present discusses the structure of two-stage, and bottom is certain specific P2P overlay network, Chord for example, CAN, Pastry, Tapest etc., they utilize separately node and resource location algorithm to provide location-based service for SIP.And the many several performances excellences relatively of can choosing of each overlay network, and often online node is as P2P Proxy.The effect of P2P Proxy is equivalent to the effect of gateway for its overlay network inside, carry out dual stack, not only in the route of overlay network interior liabilities application layer, and be responsible for intercommunication between the different overlay networks. the node in the MSN.P2P territory 3 among the figure for example, not only will be in this overlay network of msm.P2P register node (being the IP address) and resource (being sip:bob@MSN.P2P), and will be in more higher leveled territory register node (being the IP address) and resource (being sip:MSN.P2P). therefore, node 3 is had the ability sip message is forwarded in the node of other territories (for example Google.P2P) and is gone.
The adding of acting server is divided into the node adding and resource adds two parts, and unified method is followed the node administration and the method for managing resource of high one-level reciprocity Internet protocol that overlay network adopts.
Fig. 2 is the architecture of classification P2P-SIP protocol stack of the present invention.Peer Node is the ordinary node of certain overlay network inside, only moves single P2P-SIP protocol stack, and this protocol stack is the P2P-SIP agreement based on the existing search algorithm expansion of nerve of a covering.And the P2PProxy node is the gateway in the territory, and the operation dual stack is resolved to application layer by SIP over Chord with sip message, then forwards the message in the other territory by five-star P2P-SIP protocol stack.
In conjunction with Fig. 2, the present invention further stipulates the ad hoc approach that acting server is relevant:
◆ at first, Hash calculation is carried out in the network address (between the territory network address) of the node that add the upper level overlay network, obtain the ID of node.
◆ find one to start node,, take corresponding step to join in the overlay network according to the hash algorithm (as Chord, CAN, Pastry etc.) that higher level's overlay network adopts.For example,, then utilize the Finger Table of node to carry out Search and Orientation,, then adopt the method for coupling prefix to locate if that employing is Pastry if that higher level DHT employing is Chord.
◆ the node among the higher level DHT is according to the routing table of the algorithm renewal of oneself adopting oneself, and the adding of node is finished.
The method of the adding of P2P Proxy URI is at first used hash function and the domain name that will add the territory is carried out Hash (hash) is obtained the Key value.For example, if the territory that adds is MSN.P2P, then be: Key=hash (MSN.P2P).The algorithm that adopts according to higher level DHT, with URI and Key value to (URL key) is kept on the node of responsible this Key value.
The adding of this node and resource (being URI) must possess dispersiveness, must guarantee that the resource quantity (being KEY-ID quantity) of each node maintenance in the whole overlay network at the corresponding levels is basic identical.In order to guarantee the robustness of system, the key id of a resource can be inserted into a plurality of nodes, but the URI of the same KEY-ID that stores in these nodes must be identical.
In order to make each node among the subdomain DHT to realize searching in whole P2P network, each node will be appreciated that the address of the P2P Proxy URI among the own subdomain DHT.For example: if the node A in the MSN.P2P of territory will get in touch with the Node B among the Google.P2P, then node A judges the node that will get in touch not in the middle of the subdomain at own place according to the URI of Node B, so node A just needs and the P2P Proxy node contact of own place subdomain DHT, continues to search in higher level DHT by P2P Proxy node.Therefore, each node can obtain the P2P Proxy node of own place subdomain DHT by following method.
The URI and the IP address of all node broadcasts in subdomain DHT oneself in the P2P Proxy node cycle among the subdomain DHT.After the node of subdomain DHT is received the broadcast of P2P Proxy, URI and IP address caching with P2P Proxy node, Deng after when receiving this type of message again, the URI and the IP of this message are compared with the URI and the IP of own buffer memory, if it is different, then upgrade, otherwise will abandon this information.
Should be able to realize fuzzy search by P2P Proxy, for example: if input Google.P2P should be able to obtain all nodes among all Google.P2P by this P2P Proxy node.The alternation rule of concrete node is given application and is decided in its sole discretion by the user.
Withdrawing from of the P2P Proxy node of discussion of the present invention is divided into usually initiatively and withdraws from and two kinds of situations of unexpected actual effect.
It is as follows that P2P Proxy initiatively withdraws from rule:
◆ P2P Proxy withdraws from the regulation that will meet higher level DHT, and the information of when being determined whether needing this P2P Proxy to withdraw from by higher level DHT it being responsible for preserving is transmitted to its descendant node.
◆ when P2P Proxy withdrawed from, first node in the notice P2P Proxy candidate list allowed this node add upper level DHT as new P2P Proxy.
◆ the node in the candidate list receive P2P Proxy withdraw from request after, then begin request and add upper level DHT.
When P2P Proxy lost efficacy for a certain reason, have little time to send any message, if the broadcasting that this moment, ordinary node did not receive P2P Proxy has the periodicity acknowledge message of P2P Proxy candidate list, think that then this P2P Proxy lost efficacy.Lost efficacy in case find P2PProxy, then first node of candidate list initiates to join request to upper level DHT.
The hierarchical network domain name system that designs in according to the present invention, P2P-SIP user's URI concrete form is: UserID@P2PDomain.The generating mode of this URI adopts machine to generate, and the equal case-insensitive of character among the URI.
Producing the required necessary information of domain name is:
◆ the P2P software information that information of primary significance is taked for the user, for example: BT, Google, MSN, Pastry etc., we arrange to produce with this information the TLD in P2P territory.
◆ next be the ground domain information, for example: Beijing, Shanghai ... limit the scale of overlay network with this.
◆ can continue refinement according to circumstances, reach the advantage that machine physically closes among the overlay of utilizing.
◆ UserID, to draft voluntarily when registering by the user, the band collision detection mechanism is to prevent that (being that the P2P domain field is identical) produces the URI conflict among the same overlay.
For example, be buptwti if a user registers ID, the ground domain information is Beijing, and used software is chord, and the URI that then produces a classification P2P-SIP is: buptwti@beijingchord
Up to the present, this URI is not registered to above the overlay network at place, passes through so the user can't see his registration this moment.The program backstage can bind together user's IP address and this URI that obtains, and sends on the overlay network at place after this URI Hash then, and concrete information storage means is decided according to concrete P2P mode.When finishing after cryptographic Hash with URI sends on the overlay network, the mode of searching that just can use P2P realizes the position among the SIP.
User URI search procedure must utilize the respective field among the P2P Domain to judge earlier among the present invention, and whether the URI that will search with decision is local, and corresponding rank problem.
Applied search strategy among the present invention:
◆ judge at first whether the TLD sign is identical, different, delivers root P2PProxy.
◆ if the TLD sign is identical, then judges whether it is the URI of this overlay, if then directly utilize the mode of searching of P2P.
◆ if first sign of P2P Domain is not local, and perhaps the rank difference is then directly delivered root P2P Proxy and handled, and we stipulate IP addresses of root P2P Proxy under the buffer memory of each machine.Root P2P Proxy has the IP address of all P2P Proxy of subordinate, realizes that the overlay network that directly forwards the place to selects row to search.
◆ search and finish, then return IP address corresponding to the URI that searches.
Fig. 3 is the initiation process and the corresponding signaling process of inter-domain call of the present invention.Wherein the create-rule of various signalings is followed IETF RFC3261 and other to the regulation among the standard RFC (Standards Track) of SIP expansion.
As shown in Figure 3, the initiation process of inter-domain call is as follows:
◆ sending node (S) judges that at first the Request-URI of called node (D) whether with oneself being in the same territory, if belong to same territory, then utilizes local P2P Overlay mechanism to make a call; If do not belong to same territory, then use the corresponding mechanism among the local P2P Overlay in this territory, to find a node (P1) that has added Inter-Domain (in the territory) Overlay;
◆ S generates INVITE according to the regulation of RFC3261, and Request-URI wherein is set to the AOR (Address-of-Record) of D;
◆ S sends to P1 with INVITE;
◆ the inquiry called domain name of P1 by using Inter-DomainOverlay to provide obtains to join in the called territory address of a node (P2) in all nodes of Inter-Domain Overlay;
◆ P1 writes oneself address in the Via of INVITE field, and with amended forwards to P2.Simultaneously return 100Trying message to S;
◆ P2 receives after the INVITE, the address that utilizes local P2P Overlay mechanism to search destination node D;
◆ the Via field of P2 in the INVITE of receiving writes the address of oneself, and amended INVITE is transmitted to D; Simultaneously return 100Trying message to S;
◆ D receives after the INVITE, handles the step of INVITE according to the SIP UA (UserAgent) that stipulates among the RFC3261 and handles;
◆ interim message that produces in the call initiation process and final message, all according to the Via field, return S via P2, P1 successively.
◆ S receives after the message of 200 OK, utilizes the address of the D that the Contact field of message provides, directly sends ACK to D, thereby sets up Multimedia session.
◆ Media Stream is not via P1, P2 in the conversation procedure; Signaling flow as required can via, also can be not via P1, P2.
Claims (13)
1. the communication means of combining hierarchical structure peer-to-peer network and Session initiation Protocol may further comprise the steps:
(1) application inserts the related protocol of the node of hierarchy peer-to-peer network according to overlay network employing at the corresponding levels, carries out the registration of overlay network at the corresponding levels, and wherein application inserts the node of hierarchy peer-to-peer network for moving the node of dual stack;
(2) according to the domain name standard of hierarchy peer-to-peer network Session initiation Protocol, produce user's URL(uniform resource locator), thereby realize the resource registering of Session initiation Protocol in the overlay network at the corresponding levels;
(3) make each overlay network at the corresponding levels all have the node of some to become the acting server of overlay network at the corresponding levels, be registered to higher leveled overlay network, thereby make and to communicate between the different peer-to-peer networks;
In step (3), also comprise step: adopt candidate's acting server tabulation mechanism, titular equipment is listed in the tabulation of candidate's acting server, wherein titular node is the online for a long time of some, and the node with reliable bandwidth;
(4) for any call request, what overlay network at the corresponding levels can be handled is just handled by overlay network at the corresponding levels, and overlay network at the corresponding levels is not handled, and then transfers to high one-level overlay network and handles.
2. method according to claim 1 wherein according to priority order from high to low, is chosen acting server from described candidate's acting server tabulation.
3. method according to claim 1, the information that wherein is registered to higher leveled overlay network in the step (3) is the network information at the corresponding levels of described acting server representative.
4. method according to claim 1, in any one time, overlay network at the corresponding levels has an acting server at least, safeguards described candidate's acting server tabulation.
5. method according to claim 1, wherein step (1) also comprises step:
After overlay network registration at the corresponding levels, described overlay network at the corresponding levels is stored described IP addresses of nodes and network resource information at described node, thereby described node is realized communicating by letter with other nodes in the described overlay network at the corresponding levels.
6. method according to claim 1, the node that wherein is registered in the overlay network at the corresponding levels is given current acting server with its other resources situation report, acting server is set the priority of these nodes thus, and safeguards described candidate's acting server tabulation.
7. method according to claim 1, wherein step (3) also comprises step:
Become the acting server of corresponding overlay network at the corresponding levels and after being registered to higher leveled overlay network, with all nodes of notifying in the overlay network at the corresponding levels, these notified nodes are with the address information of caching proxy server at node.
8. method according to claim 1, wherein from candidate's acting server tabulation, select and become the node of acting server will be by deletion from the tabulation of candidate's acting server automatically, remaining both candidate nodes moves forward successively, add the new both candidate nodes with the acting server equal number, thereby realize the renewal of candidate's acting server tabulation;
Wherein said acting server tabulation is safeguarded by the node of each overlay network appointment.
9. method according to claim 1, the information that wherein said URL(uniform resource locator) is based on user's submission produces, and described URL(uniform resource locator) is that the overall situation is unique, and corresponding field comprises the information that can distinguish the territory, judges so that realize the domain name ownership.
10. method according to claim 1, wherein in step (3), the number of acting server and candidate's acting server depends on network condition and joint behavior situation in each local overlay network, and, do not allow all nodes all to become acting server in view of the maintenance costs and the stability of high one-level overlay network.
11. method according to claim 1, the node that wherein becomes acting server in step (3) will start two protocol registrations in higher leveled overlay network.
12. method according to claim 1, in case wherein acting server withdraws from, first node in the candidate's acting server tabulation will add higher leveled overlay network as new acting server, and each grade network all will start maintenance function and carry out redistributing of resource.
13. method according to claim 1, wherein said step (4) comprises step:
The caller node utilizes called node domain name to judge whether called node belongs to overlay network at the corresponding levels;
Belong to overlay network at the corresponding levels if judge called node domain name, use the location-based service of overlay network at the corresponding levels, called node is issued in call request;
Do not belong to overlay network at the corresponding levels if judge called node domain name, then hand to proxy server processes at the corresponding levels;
Acting server at the corresponding levels finds after the acting server of called node place network by high one-level overlay network, gives described acting server with call request, and described acting server is responsible for being transmitted to called node.
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| CN102438018A (en) * | 2011-12-16 | 2012-05-02 | 北京邮电大学 | Peer-to-peer (P2P)-voice over Internet protocol (VoIP) network relay node selection method based on autonomous system |
| CN113612813B (en) * | 2021-06-23 | 2024-06-11 | 上海骞云信息科技有限公司 | Distributed cross-network access method, device, system and storage medium |
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