CN104301356A - A peer-to-peer network data transmission method and system - Google Patents

Abstract

The invention provides a data transmission method and system of P2P network. The method comprises that a bidirectional P2P cache system transmits information of a bidirectional cache server to an ALTO server; the bidirectional P2P cache system records and obtains P2P hot-spot contents accessed by different WLAN access subscribers and transmits information of the hot-spot contents to a P2P application server; the P2P application server adds the bidirectional cache server to a candidate node set; when a subscriber request the node set from the P2P application server, the P2P application server transmits a request to the ALTO server; the ALTO server returns request response to the P2P application server, and transmits a node selection strategy to the P2P application server; and according to the node selection strategy, the P2P application server selects a node set from the candidate node set and returns the node set to the subscriber. Thus, the uplink flow of subscribers can be effectively reduced, and the network construction cost is effectively reduced.

Description

A peer-to-peer network data transmission method and system

technical field

The present application relates to the technical field of mobile communication, and in particular to a data transmission method and system of a peer-to-peer network.

Background technique

With the rapid development of mobile communication technology, peer-to-peer network (P2P) traffic in wireless local area network (WLAN) develops very rapidly. In WLAN of some provinces and cities, P2P traffic has even accounted for 80% of the total network traffic. In the currently used 802.11 protocol, the Distributed Coordination Function (DCF) mechanism is the basic access method for nodes to share wireless channels for data transmission. The characteristics of this model will enable uplink and downlink sharing and competition for wireless channel resources in WLAN. Therefore, a high proportion of P2P uplink traffic will aggravate downlink congestion, which will not only affect the user experience of the P2P application itself, but also affect the user experience of other applications (eg, HTTP browsing, etc.) in the WLAN. Therefore, it is necessary to alleviate the congestion of WLAN wireless resources by reducing the P2P uplink traffic, and improve the experience of P2P users in the WLAN, especially the experience of other applications.

In order to solve the above problems, a concept of a two-way cache (Cache) is proposed in the prior art. Among them, for the Cache in cracking mode, in addition to using the traditional Cache splitting network outbound request to replace off-network users or users in other provinces to serve in-network users, you can also use splitting into the network message (for example, Peerlist response message, etc.), and use Cache replaces WLAN access users to serve network users or external network users (that is, the reverse cache function), thereby reducing the uplink traffic of WLAN access users.

The two-way buffering technology in the prior art can reduce the uplink traffic of WLAN access users to a certain extent, and improve the experience of WLAN access users using other services. However, the above-mentioned two-way caching technology also has some problems as follows:

1. For the two-way cache implemented in crack mode (that is, the P2P application provider does not take the initiative to participate):

a) In this technology, it is necessary to add and deploy optical splitters and traffic monitoring equipment (DPI) equipment (the DPI equipment will be used to analyze the P2P messages sent or responded to WLAN users in the network), so it is necessary to increase the equipment invest;

b) In the above two-way caching technology, Cache will guide user requests to the Cache system by means of priority response or content request redirection, and Cache will serve users. However, existing P2P applications may not support the redirection function of content requests, so it may be difficult to realize the reverse Cache function; moreover, if the content requester verifies the IP information of the response, the above-mentioned priority response method is also difficult to realize Reverse Cache function.

2. For the two-way cache implemented in the cooperative mode (that is, the active participation of P2P application providers):

In this mode, although there is no need to add and deploy optical splitters and DPI devices, in practical applications, since P2P application providers are generally unwilling to add new business strategies and maintenance costs, they are also unwilling to think too much about how to reduce The impact of P2P uplink traffic on the operator's network, so P2P application providers generally do not add new policies to intentionally avoid selecting WLAN access users as service nodes, nor actively analyze content hotspots owned by WLAN access users, and Push hot content to the Cache server in advance, so the above-mentioned two-way Cache in the cooperation mode is also quite difficult to implement in practical applications, and the practicability is low.

Contents of the invention

In view of this, the present invention provides a peer-to-peer network data transmission method and system, thereby effectively reducing user uplink traffic and reducing network construction costs.

Technical scheme of the present invention is specifically realized like this:

A data transmission method of a peer-to-peer network, the method comprising:

The two-way peer-to-peer network P2P cache system sends the information of the two-way cache server to the application layer transmission optimization ALTO server;

The two-way P2P caching system records and obtains the P2P hotspot content accessed by each WLAN access user, and sends the acquired hotspot content information to the P2P application server;

The P2P application server adds the two-way cache server in the two-way P2P cache system to the set of candidate nodes;

When the user requests the node set from the P2P application server, the P2P application server sends the request to the ALTO server;

The ALTO server returns a request response to the P2P application server, and sends the node selection strategy to the P2P application server;

The P2P application server selects a node set from the candidate node set according to the node selection strategy and returns it to the user.

Preferably, the two-way P2P cache system sending the information of the two-way cache server to the ALTO server includes:

The two-way P2P cache system sends the information of the two-way cache server to the ALTO server according to a preset reporting policy.

Preferably, the preset reporting strategy is:

Report the predetermined information of each two-way cache server.

Preferably, the predetermined two-way cache server is part of two-way cache servers in the two-way P2P cache system.

Preferably, the information of the two-way cache server is:

The predetermined IP address information of each two-way cache server and the information corresponding to the IP address is the information of the two-way cache server.

Preferably, the two-way P2P caching system records and obtains the P2P hotspot content accessed by each WLAN access user including:

For the two-way P2P cache system in cracking mode, the traditional cache part in the two-way P2P cache system records the P2P hotspot content accessed by WLAN access users, and sends the recorded hotspot content information to the reverse cache in the two-way P2P cache system part;

The reverse cache part judges whether the hot content is stored in the traditional cache part, and if not, requests and acquires the hot content from the P2P application server.

Preferably, the sending the acquired hot content information to the P2P application server includes:

For the two-way P2P caching system in cracking mode, the two-way P2P caching system regularly sends the acquired hot content information to the P2P application server.

Preferably, the hot content information includes:

The identification of the hot content stored in the two-way P2P cache system, the identification information of the data block and the storage address.

Preferably, the two-way P2P caching system records and obtains the P2P hotspot content accessed by each WLAN access user including:

For the two-way P2P cache system in cooperation mode, the P2P application server pushes the P2P hotspot content accessed by the WLAN access user to the two-way P2P cache system.

Preferably, the request sent by the P2P application server to the ALTO server is:

Node attribute query request, node set sorting request and/or node cost query request.

Preferably, the ALTO server returns a request response to the P2P application server as:

When the request sent by the P2P application server to the ALTO server is a node attribute query request, the ALTO server returns an extended node attribute query response to the P2P application server;

Wherein, the extended node attribute query response is set with a field for informing the P2P application server whether the node it is querying is a two-way cache server.

Preferably, the ALTO server returns a request response to the P2P application server as:

When the request sent by the P2P application server to the ALTO server is a node set sorting request, the ALTO server returns to the P2P application server a node set sorting response for informing the P2P application server of the sorting results of each node in the node set.

Preferably, the ALTO server returns a request response to the P2P application server as:

When the request sent by the P2P application server to the ALTO server is a node cost query request, the ALTO server returns a node cost query response for informing the P2P application server of the node cost value of the queried node to the P2P application server.

Preferably, when there are WLAN access users in the candidate node set, the node selection strategy is:

The selection priority of nodes with fixed access in the network is higher than that of the two-way cache server;

The selection priority of the two-way cache server is higher than that of the WLAN access user node and the 2G/3G access user node.

The present invention also improves a peer-to-peer network data transmission system, which includes: a two-way peer-to-peer network P2P cache system, a P2P application server and an application layer transmission optimization ALTO server;

The two-way P2P cache system is used to send the information of the two-way cache server to the ALTO server; it is also used to record and obtain the P2P hot content accessed by each WLAN access user, and send the obtained hot content information to the P2P application server;

The P2P application server is used to add the two-way cache server in the two-way P2P cache system to the candidate node set; it is also used to send a request to the ALTO server when the user requests the node set from the P2P application server; The policy selects the node set from the candidate node set and returns it to the user;

The ALTO server is used to receive the hot content information sent by the two-way P2P cache system; it is also used to return a request response to the P2P application server, and send the node selection strategy to the P2P application server.

Preferably, the two-way P2P cache system further includes: a reverse cache information reporting module and at least one two-way cache server;

The reverse cache information reporting module is used to send the information of the two-way cache server to the ALTO server;

The two-way cache server is used to record and acquire the P2P hotspot content accessed by each WLAN access user, and send the acquired information of the hotspot content to the P2P application server.

Preferably, the ALTO server also includes: a cache information collection module and a WLAN traffic optimization module;

The cache information collection module is used to receive the hot content information sent by the two-way P2P cache system;

The WLAN traffic optimization module is used to return a request response to the P2P application server, and send the node selection strategy to the P2P application server.

Preferably, the P2P application server also includes: a peer-to-peer network tracking device P2P Tracker; the P2PTracker is also provided with an ALTO client;

The P2P Tracker is used to send the node set request to the ALTO client when receiving the node set request sent by the user; it is also used to select the node set from the candidate node set according to the node selection strategy and return it to the user;

The ALTO client is configured to send a request to the ALTO server, receive the request response and the node selection strategy returned by the ALTO server, and send the node selection strategy to the P2P Tracker.

The present invention also provides a two-way peer-to-peer network P2P cache system, which includes: a reverse cache information reporting module and at least one two-way cache server;

The reverse cache information reporting module is used to send the information of the two-way cache server to the ALTO server.

The two-way cache server is used to record and acquire the P2P hotspot content accessed by each WLAN access user, and send the acquired information of the hotspot content to the P2P application server.

The present invention also provides an application layer transmission optimization ALTO server, the ALTO server includes: a cache information collection module and a WLAN traffic optimization module;

The cache information collection module is used to receive the hot content information sent by the two-way peer-to-peer network P2P cache system;

The WLAN traffic optimization module is used to return a request response to the P2P application server, and send the node selection strategy to the P2P application server.

The present invention also provides a peer-to-peer network P2P application server, the P2P application server includes: a peer-to-peer network tracking device P2P Tracker; the P2P Tracker is also provided with an application layer transmission optimization ALTO client;

The P2P Tracker is used to send the node set request to the ALTO client when receiving the node set request sent by the user; it is also used to select the node set from the candidate node set according to the node selection strategy and return it to the user;

The ALTO client is configured to send a request to the ALTO server, receive the request response and the node selection strategy returned by the ALTO server, and send the node selection strategy to the P2P Tracker.

It can be seen from the above technical scheme that in the present invention, since the ALTO server will return a request response to the P2P application server when receiving the request sent by the P2P application server, and send the node selection strategy to the P2P application server, the P2P application server can be based on The node selection strategy selects the node set from the candidate node set and returns it to the user, so that when the user needs to obtain the corresponding network resources from the network nodes, the node with fixed access in the network can be selected first, followed by the two-way cache server, and finally WLAN Access user nodes and 2G/3G access user nodes, so you can preferentially select P2P nodes that are located in the same operator or even the same province as the P2P requesting user from multiple nodes, so that you can try to fix the access nodes from the network as much as possible The required data is obtained from the two-way cache server, and the data is obtained from the WLAN access user node and the 2G/3G access user node as little as possible, so the user's uplink traffic can be effectively reduced. At the same time, when using the above method and system, there is no need to add and deploy optical splitters and DPI devices in the network, thereby effectively reducing network construction costs.

Description of drawings

FIG. 1 is a flowchart of a data transmission method of a peer-to-peer network in an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a peer-to-peer network data transmission system in an embodiment of the present invention.

Detailed ways

In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

FIG. 1 is a flowchart of a data transmission method of a peer-to-peer network in an embodiment of the present invention.

As shown in Figure 1, the data transmission method of the peer-to-peer network in the embodiment of the present invention includes the following steps:

In step 101, the two-way peer-to-peer caching (P2PCache) system sends the information of the two-way caching server to the application layer transport optimization (ALTO) server.

Preferably, in a specific embodiment of the present invention, the two-way P2PCache system can send the information of the two-way cache server to the ALTO server according to a preset reporting strategy.

Among them, since the ALTO protocol is a standard protocol between the ALTO server and the ALTO client defined by the Internet Engineering Task Force (IETF), the ALTO server can obtain the network topology information of each node in the network operator and the network topology information between any two nodes. The ALTO server is usually deployed and managed by the operator; for the P2P application, the ALTO client is usually deployed on the P2P application server provided by the P2P application provider, such as the Tracker server.

Preferably, in a specific embodiment of the present invention, the preset reporting strategy may be: reporting predetermined information of each two-way cache server.

Preferably, in the technical solution of the present invention, one or more two-way cache servers can be set in the two-way P2PCache system. Therefore, in a preferred embodiment of the present invention, the predetermined two-way cache servers may be all the two-way cache servers in the two-way P2PCache system, or part of the two-way cache servers in the two-way P2PCache system.

Therefore, preferably, the information of the two-way cache server may be: the predetermined IP address information of each two-way cache server and the information of the two-way cache server corresponding to the IP address. Therefore, the information of the two-way cache server may include IP address information of one or more two-way cache servers.

In a practical application, the information of the above-mentioned two-way cache server may be a correspondence between the two-way cache server and an IP address, so that it can be learned that a certain IP address corresponds to a two-way cache server according to the correspondence.

Preferably, in a specific embodiment of the present invention, a reverse cache information reporting module can be set in the two-way P2P cache system, and a cache information collection module can be set in the ALTO server, therefore, the reverse cache information report The module can send the information of the two-way cache server to the cache information collection module in the ALTO server.

Step 102, the two-way P2PCache system records and obtains the P2P hot content accessed by each WLAN access user, and sends the obtained hot content information to the P2P application server.

Preferably, in a specific embodiment of the present invention, the two-way P2PCache system can use multiple methods to record and obtain the P2P hotspot content accessed by each WLAN access user, for example:

For the two-way P2P cache system in cracking mode, the traditional cache part in the two-way P2P cache system records the P2P hotspot content accessed by WLAN access users, and sends the recorded hotspot content information to the reverse cache in the two-way P2P cache system part;

The reverse cache part judges whether the hot content is stored in the traditional cache part, and if not, requests and acquires the hot content from the P2P application server.

At this time, in order to ensure that the two-way cache server in the two-way P2P cache system can be added to the candidate node set of the P2P Tracker in the P2P application server in the subsequent steps, in a preferred embodiment of the present invention, the The acquired hot content information sent to the P2P application server can be:

For the two-way P2P caching system in cracking mode, the two-way P2P caching system regularly sends the acquired hot content information to the P2P application server.

Preferably, in a specific embodiment of the present invention, the hot content information may include:

The identification of the hot content stored in the two-way P2P cache system (used to indicate which hot content is stored), the identification information of the data block (used to indicate which data block of which hot content is stored), and the storage address (for example, the The specific storage address of the hot content in the two-way cache server, etc.).

In addition, in a preferred embodiment of the present invention, the two-way P2PCache system records and obtains the P2P hotspot content accessed by each WLAN access user can also be:

For the two-way P2P cache system in cooperation mode, the P2P application server pushes the P2P hotspot content accessed by the WLAN access user to the two-way P2P cache system.

Step 103, the P2P application server adds the bidirectional cache server in the bidirectional P2PCache system to the set of candidate nodes.

Preferably, in a specific embodiment of the present invention, a peer-to-peer network tracking device (P2P Tracker) may be set in the P2P application server. Therefore, the P2P Tracker can add the bidirectional cache server in the bidirectional P2PCache system to the set of candidate nodes.

Step 104, when the user requests the node set from the P2P application server, the P2P application server sends the request to the ALTO server.

Preferably, in a specific embodiment of the present invention, the request sent by the P2P application server to the ALTO server may be: a node attribute query request, a node set sorting request and/or a node cost query request.

Wherein, the node attribute query request is used to query whether the node to be queried is a super node.

Generally speaking, the super node may be a node with strong processing capability and wide bandwidth, or a node with less influence on the network. In the technical solution of the present invention, the two-way cache server is a kind of super sister node. Therefore, whether a certain node is a two-way cache server can be known through the above node attribute query request.

In addition, the above node set sorting request may be used to request to sort each node in the node set.

In addition, since some P2P application servers select nodes in the node set through node cost, the node cost query request can be used to query the node cost of the corresponding node.

Preferably, in a specific embodiment of the present invention, a peer-to-peer network tracking device (P2P Tracker) can be set in the P2P application server, and an ALTO client can also be set in the P2P Tracker.

Wherein, the P2P Tracker is used for sending the node set request to the ALTO client when receiving the node set request sent by the user; the ALTO client is used for sending the request to the ALTO server and receiving the returned Request response and node selection strategy, and then send the node selection strategy to the P2P Tracker; the P2P Tracker can select a node set from the candidate node set according to the node selection strategy, and then return the selected node set to the user.

Step 105, the ALTO server returns a request response to the P2P application server, and sends the node selection policy to the P2P application server.

Preferably, in a specific embodiment of the present invention, when there are WLAN access users in the candidate node set, the node selection strategy may be:

The selection priority of fixed access nodes in the network is higher than that of the two-way cache server; the selection priority of the two-way cache server is higher than that of WLAN access user nodes and 2G/3G access user nodes.

Therefore, according to the above node selection strategy, the nodes with fixed access in the network can be selected first, followed by the bidirectional cache server, and finally WLAN access user nodes and 2G/3G access user nodes are selected, so that multiple nodes can be selected Prioritize the selection of P2P nodes located in the same operator or even the same province as the P2P requesting user.

Preferably, in a specific embodiment of the present invention, when the request sent by the P2P application server to the ALTO server is a node attribute query request, the request response returned by the ALTO server to the P2P application server is:

The ALTO server returns an extended node attribute query response to the P2P application server. Wherein, a new field is set in the extended node attribute query response to inform the P2P application server whether the node it inquires is a two-way cache server (that is, a super node).

Preferably, in a specific embodiment of the present invention, when the request sent by the P2P application server to the ALTO server is a node set sorting request, the request response returned by the ALTO server to the P2P application server is:

The ALTO server returns a node set sorting response to the P2P application server, which is used to inform the P2P application server of the sorting results of each node in the node set.

Preferably, in a specific embodiment of the present invention, when the request sent by the P2P application server to the ALTO server is a node cost query request, the request response returned by the ALTO server to the P2P application server is:

The ALTO server returns a node cost query response to the P2P application server, which is used to inform the P2P application server of the node cost value of the queried node.

Preferably, in a specific embodiment of the present invention, a WLAN traffic optimization module may also be set in the ALTO server. Wherein, the WLAN traffic optimization module can be used to return a request response to the P2P application server, and send the node selection strategy to the P2P application server.

Step 106, the P2P application server selects a node set from the candidate node set according to the node selection policy and returns it to the user.

Through the above steps 101-106, the user's uplink traffic can be effectively reduced, and at the same time, there is no need to add and deploy optical splitters and DPI devices in the network, thereby effectively reducing network construction costs.

According to the above method provided by the present invention, the present invention also provides a corresponding peer-to-peer network data transmission system, please refer to FIG. 2 for details.

FIG. 2 is a schematic structural diagram of a peer-to-peer network data transmission system in an embodiment of the present invention.

As shown in Figure 2, the data transmission system of this peer-to-peer network comprises: two-way P2PCache system 201, P2P application server 202 and ALTO server 203;

Among them, the two-way P2PCache system 201 is used to send the information of the two-way cache server to the ALTO server 203; it is also used to record and obtain the P2P hot content accessed by each WLAN access user, and send the obtained hot content information to the P2P application server 202;

The P2P application server 202 is used to add the bidirectional cache server in the bidirectional P2PCache system 201 to the candidate node set; it is also used to send a request to the ALTO server 203 when the user requests the node set from the P2P application server 202; it is also used to According to the node selection strategy, the node set is selected from the candidate node set and returned to the user;

The ALTO server 203 is used to receive the hot content information sent by the two-way P2PCache system 201 ; it is also used to return a request response to the P2P application server 202 and send the node selection policy to the P2P application server 202 .

Preferably, in a specific embodiment of the present invention, the two-way P2PCache system 201 further includes: a reverse cache information reporting module and at least one two-way cache server;

The reverse cache information reporting module is used to send the information of the two-way cache server to the ALTO server 203;

The two-way cache server is configured to record and acquire the P2P hotspot content accessed by each WLAN access user, and send the acquired hotspot content information to the P2P application server 202 .

Preferably, in a specific embodiment of the present invention, the ALTO server 203 further includes: a cache information collection module and a WLAN traffic optimization module;

The cache information collection module is used to receive the information of the two-way cache server sent by the two-way P2PCache system 201;

The WLAN traffic optimization module is configured to return a request response to the P2P application server 202 and send the node selection policy to the P2P application server 202 .

Preferably, in a specific embodiment of the present invention, the P2P application server 202 also includes: a peer-to-peer network tracking device (P2P Tracker); the P2P Tracker is also provided with an ALTO client;

The P2P Tracker is used to send the node set request to the ALTO client when receiving the node set request sent by the user; it is also used to select the node set from the candidate node set according to the node selection strategy and return it to the user;

The ALTO client is configured to send a request to the ALTO server 203, receive the request response and the node selection strategy returned by the ALTO server 203, and send the node selection strategy to the P2P Tracker.

In addition, in the technical solution of the present invention, a two-way P2P caching system is also provided. The two-way P2P cache system includes: a reverse cache information reporting module and at least one two-way cache server;

Wherein, the reverse cache information reporting module is configured to send the information of the two-way cache server to the ALTO server.

The two-way cache server is used to record and acquire the P2P hotspot content accessed by each WLAN access user, and send the acquired information of the hotspot content to the P2P application server.

In addition, in the technical solution of the present invention, an ALTO server is also provided. The ALTO server includes: cache information collection module and WLAN traffic optimization module;

The cache information collection module is used to receive the hot content information sent by the two-way peer-to-peer network P2P cache system;

The WLAN traffic optimization module is used to return a request response to the P2P application server, and send the node selection strategy to the P2P application server.

In addition, in the technical solution of the present invention, a P2P application server is also provided. Described P2P application server comprises: Peer-to-peer network tracking device P2P Tracker; Also be provided with application layer transmission optimization ALTO client in described P2P Tracker;

The P2P Tracker is used to send the node set request to the ALTO client when receiving the node set request sent by the user; it is also used to select the node set from the candidate node set according to the node selection strategy and return it to the user;

The ALTO client is configured to send a request to the ALTO server, receive the request response and the node selection strategy returned by the ALTO server, and send the node selection strategy to the P2P Tracker.

In summary, in the technical solution of the present invention, since the ALTO server will return a request response to the P2P application server when receiving the request sent by the P2P application server, and send the node selection strategy to the P2P application server, the P2P application server According to the node selection strategy, the node set can be selected from the candidate node set and returned to the user, so that when the user needs to obtain the corresponding network resources from the network nodes, the node with fixed access in the network can be selected first, followed by the two-way cache server, and finally Select WLAN access user nodes and 2G/3G access user nodes, so you can preferentially select P2P nodes that are located in the same operator or even the same province as the P2P requesting user from multiple nodes, so that you can try to access from the network as much as possible The required data is obtained from the node and the two-way cache server, and the data is obtained from the WLAN access user node and the 2G/3G access user node as little as possible, so the user's uplink traffic can be effectively reduced. At the same time, since the above method and system are used, it is not necessary to add and deploy optical splitters and DPI devices in the network, thereby effectively reducing network construction costs.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (21)

1. a data transmission method for peer-to-peer network, is characterized in that, the method comprises:

The information of two-way caching server is sent to application layer transmission optimization ALTO server by two-way Peer-to-Peer Network P2P caching system;

Two-way P2P caching system record also obtains the P2P Hot Contents that each WLAN access user accesses, and the information of obtained Hot Contents is sent to P2P application server;

Two-way caching server in two-way P2P caching system is joined both candidate nodes and concentrates by P2P application server;

When user is to P2P application server requesting node collection, P2P application server sends request to ALTO server;

ALTO server returns request response to P2P application server, and sensor selection problem strategy is sent to P2P application server;

P2P application server concentrates selection set of node to return to user according to sensor selection problem strategy from both candidate nodes.

2. method according to claim 1, is characterized in that, the information of two-way caching server sends to ALTO server to comprise by described two-way P2P caching system:

The information of two-way caching server is sent to ALTO server according to the reporting policy preset by described two-way P2P caching system.

3. method according to claim 2, is characterized in that, the described reporting policy preset is:

Report the information of each two-way caching server predetermined.

4. method according to claim 3, is characterized in that:

Described predetermined two-way caching server is the two-way caching server of part in two-way P2P caching system.

5. according to the method described in claim 3 or 4, it is characterized in that, the information of two-way caching server is:

Corresponding to the IP address information of each two-way caching server predetermined and described IP address is the information of two-way caching server.

6. method according to claim 1, is characterized in that, described two-way P2P caching system record also obtains the P2P Hot Contents that each WLAN access user accesses and comprises:

For the two-way P2P caching system cracking pattern, the P2P Hot Contents that traditional buffer unit member record WLAN access user in two-way P2P caching system is accessed, and the information of recorded Hot Contents is sent to the inverted cache part in two-way P2P caching system;

Described inverted cache part judges whether store described Hot Contents in traditional buffer memory part, if do not stored, then obtains described Hot Contents to the request of P2P application server.

7. method according to claim 6, is characterized in that, the described information by obtained Hot Contents sends to P2P application server to comprise:

For the two-way P2P caching system cracking pattern, described two-way P2P caching system regularly sends the information of the Hot Contents obtained to P2P application server.

8. the method according to claim 6 or 7, is characterized in that, the information of described Hot Contents comprises:

The mark of Hot Contents stored in two-way P2P caching system, the identification information of data block and memory address.

9. method according to claim 1, is characterized in that, described two-way P2P caching system record also obtains the P2P Hot Contents that each WLAN access user accesses and comprises:

For the two-way P2P caching system of modality for co-operation, the P2P Hot Contents that WLAN access user is accessed by P2P application server is pushed in two-way P2P caching system.

10. method according to claim 1, is characterized in that, the request that P2P application server sends to ALTO server is:

Nodal community inquiry request, set of node sequencing requests and/or node cost inquiry request.

11. methods according to claim 10, is characterized in that, described ALTO server returns request response to P2P application server and is:

When P2P application server is nodal community inquiry request to the request that ALTO server sends, described ALTO server returns the nodal community inquiry response of expansion to P2P application server;

Wherein, be provided with in the nodal community inquiry response of described expansion for informing that whether its node inquired about of P2P application server is the field of two-way caching server.

12. methods according to claim 10, is characterized in that, described ALTO server returns request response to P2P application server and is:

When P2P application server is set of node sequencing requests to the request that ALTO server sends, described ALTO server returns the set of node sequence response for the ranking results of each node in set of node being informed P2P application server to P2P application server.

13. methods according to claim 10, is characterized in that, described ALTO server returns request response to P2P application server and is:

When P2P application server is node cost inquiry request to the request that ALTO server sends, described ALTO server returns the node cost inquiry response for the node value at cost of institute's query node being informed P2P application server to P2P application server.

14. methods according to claim 1, is characterized in that, when both candidate nodes concentrate have a WLAN access user time, described sensor selection problem strategy is:

The selection priority of the node of net internal fixtion access is higher than the selection priority of two-way caching server;

The selection priority of two-way caching server is higher than the selection priority of WLAN access user node and 2G/3G access user node.

The data transmission system of 15. 1 kinds of peer-to-peer networks, is characterized in that, this system comprises: two-way Peer-to-Peer Network P2P caching system, P2P application server and application layer transmission optimization ALTO server;

Described two-way P2P caching system, for sending to ALTO server by the information of two-way caching server; Also for recording and obtaining the P2P Hot Contents that each WLAN access user accesses, the information of obtained Hot Contents is sent to P2P application server;

Described P2P application server, concentrates for the two-way caching server in two-way P2P caching system is joined both candidate nodes; Also for when user is to P2P application server requesting node collection, send request to ALTO server; Also for concentrating selection set of node to return to user according to sensor selection problem strategy from both candidate nodes;

Described ALTO server, for receiving the information of the Hot Contents that two-way P2P caching system sends; Also for returning request response to P2P application server, sensor selection problem strategy is sent to P2P application server.

16. systems according to claim 15, is characterized in that, also comprise in described two-way P2P caching system: inverted cache information reporting module and at least one two-way caching server;

Described inverted cache information reporting module, for sending to ALTO server by the information of two-way caching server;

Described two-way caching server, for recording and obtaining the P2P Hot Contents that each WLAN access user accesses, sends to P2P application server by the information of obtained Hot Contents.

17. systems according to claim 15, is characterized in that, also comprise in described ALTO server: cache information collection module and WLAN flow optimization module;

Described cache information collection module, for receiving the information of the Hot Contents that two-way P2P caching system sends;

Described WLAN flow optimization module, for returning request response to P2P application server, sends to P2P application server by sensor selection problem strategy.

18. systems according to claim 15, is characterized in that, also comprise in described P2P application server: peer-to-peer network tracking means P2P Tracker; ALTO client is also provided with in described P2P Tracker;

Described P2P Tracker, for when receiving the set of node request that user sends, sends to ALTO client by described set of node request; Also for concentrating selection set of node to return to user according to sensor selection problem strategy from both candidate nodes;

Described ALTO client, for sending request to ALTO server, the request response that reception ALTO server returns and sensor selection problem strategy, send to described P2P Tracker by sensor selection problem strategy.

19. 1 kinds of two-way Peer-to-Peer Network P2P caching systems, it is characterized in that, this system comprises: inverted cache information reporting module and at least one two-way caching server;

Described inverted cache information reporting module, for sending to ALTO server by the information of two-way caching server.

Described two-way caching server, for recording and obtaining the P2P Hot Contents that each WLAN access user accesses, sends to P2P application server by the information of obtained Hot Contents.

20. 1 kinds of application layer transmission optimization ALTO server, it is characterized in that, this ALTO server comprises: cache information collection module and WLAN flow optimization module;

Described cache information collection module, for receiving the information of the Hot Contents that two-way Peer-to-Peer Network P2P caching system sends;

Described WLAN flow optimization module, for returning request response to P2P application server, sends to P2P application server by sensor selection problem strategy.

21. 1 kinds of Peer-to-Peer Network P2P application servers, is characterized in that, this P2P application server comprises: peer-to-peer network tracking means P2P Tracker; Application layer transmission optimization ALTO client is also provided with in described P2P Tracker;

Described P2P Tracker, for when receiving the set of node request that user sends, sends to ALTO client by described set of node request; Also for concentrating selection set of node to return to user according to sensor selection problem strategy from both candidate nodes;

Described ALTO client, for sending request to ALTO server, the request response that reception ALTO server returns and sensor selection problem strategy, send to described P2P Tracker by sensor selection problem strategy.