WO2012055112A1

WO2012055112A1 - Method for establishing connection and apparatus, communication system thereof

Info

Publication number: WO2012055112A1
Application number: PCT/CN2010/078222
Authority: WO
Inventors: 周伟; 王岩
Original assignee: 华为技术有限公司
Priority date: 2010-10-29
Filing date: 2010-10-29
Publication date: 2012-05-03
Also published as: CN102714617B; CN102714617A

Abstract

A method for establishing a connection includes: after establishing a first host identity protocol(HIP) association between a first address of a second terminal and a second address of a first terminal, the second terminal saves a first mapping relation among the first address, the second address and the first HIP association; a first transmission control protocol(TCP) connection between the first address and the second address is established, and a first TCP SYN message includes connection identity(CID) information; the second terminal establishes a second HIP association between a third address and a forth address of the second terminal, and saves a second mapping relation among the third address, the forth address and the second HIP association; a second TCP connection between the third address and the forth address is established, and a second TCP SYN message includes CID information which is the same with that of the first TCP SYN message. An apparatus for establishing a connection and a communication system corresponding to the method for establishing a connection are also provided. The multi-access of the terminal in the HIP network can be realized.

Description

Connection establishment method, device and communication system

Technical field

The present invention relates to the field of communications technologies, and in particular, to a connection establishment method, apparatus, and communication system. Background technique

As the mobility of the terminal increases, mobility management needs to be implemented on the terminal host. In order to solve the mobility problem of the host, the Internet Engineering Task Force (IETF) proposes a method of separating the identification and positioning functions to solve the mobility, which is also the host identity protocol (HIP: Host Identity Protocol). ) The starting point. In the HIP protocol, the idea of an asymmetric key encryption algorithm is adopted, and the public key in the key pair is used as the host identifier of the node (HI: Host Identity) „ Since HI as a public key may be relatively long, at all In actual use, it is not very useful. In actual use, the saved value is the 128-bit hash value of this host ID, which is the host identifier (HIT: Host Identity Tag). Since the lengths of HIT and IPv6 addresses are exactly the same, It can be directly applied to IPv6 applications. After such processing, the separation of host ID and host location is achieved.

After the HIP is added, the existing Transmission Control Protocol/Internet Protocol (TCP/IP) protocol stack needs to be modified, and a host identification layer is added between the network layer and the transport layer, specifically, the HIP network protocol. In the stack, the bottom layer is the physical layer, and the top layer is the link layer, the network layer (IPv4 or IPv6), the HIP layer, the transport layer (TCP/UDP), and the application layer. That is, a new protocol stack HIP layer is added between the network layer and the transport layer, and the correspondence between the port and the IP is changed to the correspondence between the port and the HIT. Therefore, the application layer does not need to know the current host and the specific address of the host to be contacted, just need to know the host ID. The IP address is used only as a routing function here, and the HIP layer implements a mapping between the host's HIT and IP address to implement a complete communication process.

At the HIP level, each packet containing the source HIT and the target HIT is mapped to the IP address of the node, and the IP packet is routed at the network layer. The source HIT is mapped to the source IP address, and the target HIT is mapped to the target IP address. After the packet is sent to the peer through the network layer route and other functions, the HIP layer on the peer maps the IP address to the HIT. Specifically, the source IP address is mapped to the source HIT, and the target IP address is mapped to the target HIT, and the message is further sent to the transport layer for processing, thereby realizing that the message arrives at the sender from the sender's transport layer. The transport layer, completes the end-to-end transmission. Therefore, the application layer will use the HIT to identify the upper connection, and the HIT can be used throughout It remains unchanged during the connection process. On the other hand, the underlying IP address can change with the move, but this change in IP address is transparent to the upper layer application, thus solving the host mobility problem.

However, since the host identity protocol introduces the HIP layer in the protocol stack, the correspondence between the port and the IP is changed to the correspondence between the port and the HIT, and the HIT of the HIP layer is bound to only one IP address at the same time. The terminal cannot implement multiple access in the HIP network.

Summary of the invention

Embodiments of the present invention provide a connection establishment method, apparatus, and communication system, so that a terminal implements multiple access in a HIP network.

An embodiment of the present invention provides a connection establishment method, including:

After the second terminal establishes that the first address of the second terminal is associated with the first host identity protocol of the second address of the first terminal, the second terminal saves that the first address and the second address are associated with the first host identity protocol First mapping relationship;

Transmitting, by the first terminal, the first transmission control protocol synchronization message to the first terminal by using the first address, to establish a first address of the first address and the second address, according to the first mapping relationship a transmission control protocol connection, where the first transmission control protocol synchronization message includes connection identifier information;

Receiving, by the second terminal, a fourth address of the first terminal sent by the first terminal;

Establishing, by the second terminal, a third address of the second terminal and a second host identity protocol of the fourth address, where the second terminal saves the third address and the fourth address are associated with the second host identity protocol Mapping relations;

The second terminal sends a second transmission control protocol synchronization message to the first terminal by using the third address according to the second mapping relationship, to establish the third address and the second address of the fourth address. a transmission control protocol connection, the second transmission control protocol synchronization message including the same connection identifier information as the first transmission control protocol synchronization message.

Another embodiment of the present invention provides a connection establishing apparatus, including a host identity protocol association establishing unit, a saving unit, a transmission control protocol connection establishing unit, and a receiving unit;

The host identity protocol association establishing unit is configured to establish a first address associated with the first host identity protocol of the second address of the first terminal; after the receiving unit receives the fourth address sent by the first terminal, establish a third The address is associated with a second host identity protocol of the fourth address;

The saving unit is configured to establish the first host in the host identity protocol association establishing unit After the association of the protocol is associated, the first mapping relationship between the first address and the second address and the first host identity protocol is saved; after the host identity protocol association establishing unit establishes the second host identity protocol association, Saving a second mapping relationship between the third address and the fourth address and the second host identity protocol;

The transmission control protocol connection establishing unit is configured to send, by using the first address, a first transmission control protocol synchronization message to the first terminal according to the first mapping relationship saved by the saving unit, to establish a The first address is connected to the first transmission control protocol of the second address, the first transmission control protocol synchronization message includes connection identifier information, and the third mapping is performed according to the second mapping relationship saved by the saving unit. Transmitting, by the first terminal, a second transmission control protocol synchronization packet, to establish a connection between the third address and the fourth transmission control protocol, where the second transmission control protocol synchronization packet includes The connection identifier information is the same as the first transmission control protocol synchronization message; the receiving unit is configured to receive the fourth address sent by the first terminal.

Another embodiment of the present invention provides a communication system, including the connection establishment apparatus provided by the embodiment of the present invention.

It can be seen from the above technical solution provided by the embodiment of the present invention that, in the foregoing embodiment, the source endpoint may save the first mapping relationship between the first address and the second address and the first HIP, thereby establishing the first address and a first TCP connection between the second address, and carrying the CID information in the process of establishing the first TCP connection, so that after receiving the fourth address sent by the first terminal, the CID information can be used to establish the third address and the third address A second TCP connection between the four addresses, so that at least two TCP connections can be applied to the same TCP, so that different TCP flows of one TCP application can be transmitted through different paths, so that terminals supporting multiple access are in the HIP network. It can take advantage of multiple access and improve the utilization efficiency of terminals and networks.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without departing from the drawings.

1 is a schematic diagram of a hierarchy of host identification protocols in the prior art;

2 is a schematic diagram of a HIP network protocol stack according to an embodiment of the present invention; FIG. 3 is a flowchart of a connection establishment method according to an embodiment of the present invention;

4 is a signaling flowchart of a connection establishment method according to another embodiment of the present invention;

FIG. 5 is a structural diagram of a connection establishing apparatus according to an embodiment of the present invention;

6 is a structural diagram of a connection establishing apparatus according to another embodiment of the present invention;

FIG. 7 is a structural diagram of a connection establishing apparatus according to another embodiment of the present invention; FIG.

FIG. 8 is a structural diagram of a connection establishing apparatus according to another embodiment of the present invention.

detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

1 is a schematic diagram of a HIP protocol stack in the prior art. As shown in FIG. 1, the bottom layer of the HIP protocol stack is a physical layer, and the uplink layer is a link layer, a network layer (IPv4 or IPv6), and a HIP layer. Transport layer (TCP/UDP) and application layer.

In an embodiment of the present invention, the function of the multi-path TCP is introduced on the terminal supporting the HIP protocol, so that the function of the transport layer of the terminal supporting the HIP protocol is decomposed into a semantic layer and a TCP sub-flow layer, wherein the semantics Layers, also known as multipath TCP layers, are responsible for scheduling and management between multiple TCP substreams. In an embodiment of the present invention, the HIP network protocol stack is as shown in FIG. 2. In FIG. 2, the bottom layer is a physical layer interface with multiple accesses, and the upper layer is a network layer, and above the network layer. For the HIP layer, it is mainly used to shield the upper layer from accessing IP, so that the mapping between the original port and the IP address is changed to the mapping between the port and the HIT on the HIP level. Above the HIP level, it is a TCP sub-flow layer, which can correspond to multiple physical interfaces at the bottom. For example, a TCP sub-flow can correspond to an underlying physical interface. Above the TCP sub-flow layer is a multi-path TCP layer, which can perform path management and scheduling for the lower-layer TCP sub-flow, and the multi-path TCP layer can also reorder data of multiple TCP sub-flows and submit it to the application layer. For example, multiple TCP substreams are combined and sent to the application layer to implement transparency of the underlying changes to the upper application. The uppermost application layer, which is not aware of the changes in the transport layer, continues to communicate with the peer through the HIT.

The connection establishment method provided by the embodiment of the present invention is described first. FIG. 3 is a flowchart of a connection establishment method according to an embodiment of the present invention. The second terminal is specifically described in the embodiment. It is a processing flow of a source endpoint in a communication process, and the embodiment includes the following steps.

301. The second terminal establishes a first RRC association between the first address of the second terminal and the second address of the first terminal, and the second terminal saves the first mapping relationship between the first address and the second address and the first HIP.

The second terminal may obtain the second address of the first terminal from the DNS server or the RVS server, and the DNS server and the RVS server may save the correspondence between the HIT of the terminal and the address of the terminal, for example, the second terminal may be according to the application layer. The HIT included in the sent data packet determines the address of the terminal corresponding to the HIT. For example, the HIT corresponds to the first terminal, and the second terminal queries the DNS server or the RVS server to learn the first address of the first terminal. In the embodiment of the present invention, the address of the terminal may be an IP address.

The second terminal establishes a first HIP association between the first address of the second terminal and the second address of the first terminal, where the second terminal sends the first initial message to the first terminal; The second terminal sends the first response to the first terminal, and the second terminal sends the second initial message to the first terminal. The first terminal sends the second response to the second terminal.

In the HIP network structure, the HIP layer implements a mapping relationship between an IP address and an HIT. For a terminal having multiple physical interfaces, there is only one HIT to identify the terminal, and the TCP sub-flow layer is between the HIP association and the HIT. Mapping relationship. The HIP protocol supports multiple physical interfaces (multiple IP addresses), so that one HIT can be bound to multiple IP addresses to implement fault recovery. However, at the same time, the HIT of the HIP layer is bound to only one IP address. (a physical interface), so for the upper multipath TCP, multiple TCP connections will still correspond to the same HIT, that is, the data of multiple TCP substreams will only pass through a physical interface (address) bound to the HIT. The transmission is performed. Therefore, the mapping between the TCP sub-flow and the HIP association is introduced in the embodiment of the present invention. The mapping relationship is specifically to establish a mapping relationship between the HIP-associated address and the HIP, and the mapping relationship is saved in the terminal. Therefore, after the first HIP association is established, the second terminal may save the first mapping relationship between the first address and the second address and the first HIP. When the terminal supporting the HIP protocol transmits data, the first mapping relationship may be caused by the upper layer. The TCP substream corresponds to a plurality of different HIP associations, and thus corresponds to a plurality of different physical interfaces, thereby being transmitted through different paths.

At the same time, the first mapping relationship can also be saved in the first terminal.

302. The second terminal sends a first TCP synchronization (SYN) packet to the first terminal by using the first address according to the first mapping relationship, to establish a first TCP connection between the first address and the second address, where the first TCP SYN 4) The message contains the connection identifier (CID: Connection Identity) information.

After the second terminal establishes the first HIP association, if the TCP connection corresponding to the first HIP association needs to be established, the first address corresponding to the first HIP association may be determined according to the first mapping relationship, and then the first address is used. Sending a first TCP SYN 4 message to the first terminal, so as to establish a first TCP connection between the first address and the second address, where the first TCP connection is the first TCP sub-flow.

In order to identify the first TCP connection, the first TCP SYN message further includes CID information, where the connection identifier information indicates common features of multiple TCP sub-flows belonging to the same TCP application, and has the same connection identifier information. The TCP connection will be aggregated into a TCP connection on the multi-connection TCP layer. So there is only one TCP connection at the application layer perspective.

In an embodiment of the present invention, the second terminal sends the first TCP SYN packet to the first terminal by using the first address according to the first mapping relationship, so that the first TCP connection of the first address and the second address may be specifically used. The second terminal sends the first TCP SYN packet to the first terminal by using the first address according to the first mapping relationship, and receives the first TCP synchronization and acknowledgement (SYN/ACK) packet returned by the second address, the first TCP. The SYN/ACK packet includes the CID information, and the first TCP SYN/ACK packet is sent by the second address to the first TCP SYN packet forwarded by the first terminal, and the first terminal is configured according to the saved first mapping relationship. A TCP SYN packet is forwarded to the second address; a TCP acknowledgement (ACK) packet is sent to the second address by using the first address, and the establishment of the first TCP connection is completed.

After the first TCP connection is established, the TCP application layer can transmit data over the first TCP connection.

In another embodiment of the present invention, after the second terminal establishes the first TCP connection of the first address and the second address, the second terminal may further receive the information of the second address failure sent by the first terminal; A mapping relationship determines that the second address corresponds to the first TCP connection, so that when the second terminal sends the TCP connection teardown request to the first terminal, the second terminal may carry the second address in the TCP connection teardown request, so as to correctly remove the first TCP connection.

303. The second terminal receives the fourth address sent by the first terminal.

The fourth address received by the second terminal is sent by the first terminal after the first TCP connection is established, and the fourth address is a multiple access address of the first terminal. It should be noted that the fourth address may be more than one. The specific address. The fourth address can be sent through the first TCP connection. In another embodiment of the present invention, the second terminal may also send the fifth address of the second terminal to the first terminal, where the fifth address is also a multiple access address. It should be noted that the fifth address may be a The above specific address. Thereby, the first terminal actively initiates establishing a third TCP connection of the sixth address and the fifth address. The fifth address can also be sent over the first TCP connection.

In one embodiment of the present invention, the fifth address and the first address of the second terminal may be the same address.

304. The second terminal establishes a second HIP association between the third address and the fourth address, and the second terminal saves the second mapping relationship between the third address and the fourth address and the second HIP.

At the same time, the first terminal may also save the second mapping relationship.

In one embodiment of the present invention, the third address and the first address may also refer to the same address.

305. The second terminal sends a second TCP SYN packet to the first terminal by using the third address according to the second mapping relationship, to establish a second TCP connection between the third address and the fourth address, where the second TCP SYN packet includes The same CID information of a TCP SYN message.

After the second HIP association is established, if the TCP connection corresponding to the second HIP association needs to be established, the third address corresponding to the second HIP association may be determined according to the second mapping relationship, and then the first address is obtained through the third address. The terminal sends a second TCP SYN packet, so as to establish a second TCP connection of the third address and the fourth address, where the second TCP connection is the second TCP substream.

In order to identify that the second TCP connection belongs to the same TCP application as the established first TCP connection, the second TCP SYN message may also include connection identifier information, and the TCP connection with the same connection identifier information will be in multiple connections. Converged on the TCP layer into a TCP connection.

In an embodiment of the present invention, the second TCP SYN packet is sent to the first terminal by using the third address according to the second mapping relationship, so that the second TCP connection of the third address and the fourth address may be established in the following manner. Transmitting, by the third address, the second TCP SYN packet to the first terminal according to the second mapping relationship; receiving the second TCP SYN/ACK packet returned by the fourth address, where the second TCP SYN/ACK packet includes CID information, where the The second TCP SYN/ACK packet is sent by the fourth address to the second TCP SYN packet forwarded by the first terminal, and the first terminal forwards the second TCP SYN packet to the fourth address according to the saved second mapping relationship; The TCP ACK packet is sent to the fourth address through the third address, and the establishment of the second TCP connection is completed. After the second TCP connection is established, the TCP application layer can simultaneously transmit data through the first TCP connection and the second TCP connection.

In another embodiment of the present invention, the second terminal establishes a third address and a second address

After the TCP connection, the information about the fourth address failure sent by the first terminal may be further received. At this time, the fourth address may be determined to correspond to the second TCP connection according to the second mapping relationship, so that the second terminal sends the TCP to the first terminal. When the connection removal request is made, the fourth address may be carried in the TCP connection teardown request, so that the second TCP connection is properly removed. Specifically, the TCP connection teardown request may be a TCP end (FIN) message.

In the embodiment of the present invention, the first HIP association and the first TCP connection are corresponding to each other, that is, the corresponding first TCP connection can be found according to the first HIP association. Similarly, the corresponding second TCP connection can be found according to the second HIP association.

In the protocol stack as described in FIG. 2, if the second terminal and the first terminal establish a first HIP association and a second HIP association, and establish a first TCP connection and a second TCP connection, then in the TCP sub-flow layer There are two TCP substreams, a first TCP connection (first TCP substream) and a second TCP connection (second TCP substream). And because the CIDs of the first TCP connection and the second TCP connection are the same, the multi-path TCP layer can aggregate the first TCP connection and the second TCP connection into the same TCP connection and send it to the application layer. Therefore, the multi-path TCP layer can parse the received TCP connection, obtain the CID of the TCP connection, and determine whether the CID of the received TCP connection is the same.

In another embodiment of the present invention, after receiving the data sent by the application layer, the multi-path TCP layer can find the HIP association corresponding to the HIT according to the HIT included in the data, and further find the association with the HIP association. The TCP connection performs data transfer. The multi-path TCP layer stores a correspondence between the HIT and the HIP association, or a correspondence between the HIT and the TCP connection.

As can be seen from the above, in the embodiment, the second terminal may save the first mapping relationship between the first address and the second address and the first HIP, thereby establishing a first TCP connection between the first address and the second address, and The process of establishing the first TCP connection carries the CID information, so after receiving the fourth address sent by the first terminal, the CID information can be used to establish a second TCP connection between the third address and the fourth address, thereby The same TCP application has at least two TCP connections, so that different TCP flows of one TCP application can be transmitted through different paths, so that the terminal supporting multiple access can take advantage of multiple access in the HIP network, and can improve the terminal and The efficiency of the use of the network. In another embodiment of the present invention, after the first TCP connection is established, the second terminal may send the fifth address to the first terminal, so that the first terminal may initiate the establishment of the TCP connection, further improving the terminal and the network. Utilization efficiency. In another embodiment of the present invention, if the second terminal receives the information of the fourth address failure after the second TCP connection is established, the second terminal may tear down the second TCP connection, thereby enabling resources of the terminal and the network. A valid application can be obtained.

Figure 4 depicts a signaling flow of a connection establishment method provided by another embodiment of the present invention, the embodiment including the following steps.

401. The second terminal sends the first initial message to the second address of the first terminal by using the first address of the second terminal.

The first initial message includes the HIT of the second terminal and the HIT of the first terminal, and the second terminal can obtain the defect of the first terminal from the DNS server or the RVS server.

402. The second address of the first terminal sends the first response to the first address of the second terminal. After receiving the first initial message, the first terminal sends back the first response message to the second terminal. In the first response message, a generated puzzle is included, which requires a second terminal solution. The first terminal implements security verification of the second terminal by this method. In addition, a Diffie-Hellman process may be included in the first response, including a public key of the first terminal and a Diffie-Hellman parameter.

403. The first address of the second terminal sends a second initial message to the second address of the first terminal. After receiving the first response message of the first terminal, the second terminal first answers the puzzle and includes the result of the solution in the second initial text. Also included in the second initial message are information such as response information, security parameter index, and encrypted public key.

404. The second address of the first terminal sends a second response to the first address of the second terminal. After receiving the second initial message, the first terminal verifies the puzzle that the second terminal has answered, and authenticates the second terminal. In the second response sent back by the first terminal, the security parameter index value of the first terminal will be included.

This completes the establishment of the first HIP association between the first address of the second terminal and the second address of the first terminal.

405. The first terminal and the second terminal save a first mapping relationship between the first address and the second address and the first HIP.

406. The first address of the second terminal sends the first TCP SYN to the second address of the first terminal. Text.

The first address of the second terminal sends a first TCP SYN message to the second address of the first terminal to initiate a first TCP connection establishment process. The first TCP SYN packet carries the connection identifier information in order to identify the first TCP connection.

407. The second address of the first terminal sends a first TCP SYN/ACK packet to the first address of the second terminal.

After receiving the first TCP SYN packet sent by the first address of the second terminal, the first terminal forwards the first TCP SYN 4 message to the second address according to the first mapping relationship. After receiving the first TCP SYN packet, the second address checks the connection identifier information contained therein. If the connection identifier information is not present in the local device, it indicates that a new TCP connection is established. Then, the second address of the first terminal sends a first TCP SYN/ACK message to the first address of the second terminal, and carries the same connection identifier information in the first TCP SYN message. The first TCP SYN/ACK message is an acknowledgement of the first TCP SYN 4 message on the one hand, and a connection identifier information confirming the TCP connection on the other hand, and can be generated by using the connection identifier information in a subsequent process. TCP subflow.

408. The first address of the second terminal sends the first TCP ACK message to the second address of the first terminal.

The first TCP ACK packet is a three-way handshake process for confirming the first TCP SYN/ACK packet and completing the TCP connection establishment.

In the HIP network, the first TCP connection is established after 406~408. At the same time, this connection maintains a connection identifier information that can be used to establish TCP substreams belonging to the same TCP application.

409. The first terminal sends a fourth address to the second terminal by using the first TCP connection, where the fourth address is a multiple access address, indicating that the first terminal can use the fourth address to establish more of the same TCP application with the second terminal. TCP subflow.

410. Establish a second HIP association between the third address of the second terminal and the fourth address of the first terminal. For the establishment process of the second HIP association, refer to 401~404.

411. The first terminal and the second terminal save a second mapping relationship between the third address and the fourth address and the second HIP.

412. The third address of the second terminal sends the second TCP SYN to the fourth address of the first terminal. Text.

The third address of the second terminal sends a second TCP SYN message to the fourth address of the first terminal to initiate a second TCP connection establishment process. The second TCP SYN packet carries the connection identifier information, where the connection identifier information is the same as the connection identifier information carried in the first TCP SYN packet, and is used to indicate the first TCP connection. And the second TCP connection belongs to the same TCP application.

413. The fourth address of the first terminal sends a second TCP SYN/ACK packet to the third address of the second terminal.

After receiving the second TCP SYN packet sent by the third terminal of the second terminal, the first terminal forwards the second TCP SYN packet to the fourth address according to the second mapping relationship. After receiving the second TCP SYN packet, the fourth address checks the connection identifier information contained therein. If the connection identifier information is present in the local device, it indicates that a TCP connection is established as the TCP substream. Then, the fourth address of the first terminal sends a second TCP SYN/ACK packet to the third address of the second terminal, and carries the same connection identifier information in the second TCP SYN packet, indicating that the second Confirmation of TCP SYN packets.

414. The third address of the second terminal sends a second TCP ACK message to the fourth address of the first terminal.

The second TCP ACK packet is a three-way handshake process for confirming the second TCP SYN/ACK packet and completing the TCP connection establishment.

In the HIP network, a second TCP connection is established after 412~414. The second TCP connection belongs to the same TCP connection as the first TCP connection. The upper application layer can send data through two different TCP connections to implement multi-access transmission and multi-path transmission in the HIP network. After receiving the packets from the two TCP connections, the destination endpoint aggregates the data into a TCP stream on the multi-path TCP layer and hands it over to the application layer to implement transparency of the application layer.

Specifically, the application layer of the second terminal forwards the data packet to the multipath TCP layer, where the multipath

The TCP layer determines, according to the HIT of the data packet, that there are two TCP connections corresponding to the HIT, namely, TCP 1 and TCP 2. Then, the multi-path TCP layer of the second terminal sends the data packet to the bottom layer through TCP 1 and TCP 2. Transmitting, the bottom layer of the second terminal sends the data packet to the first terminal, and the bottom layer of the first terminal receives the data packet sent by the TCP 1 and the TCP 2 connection, and the bottom of the first terminal The layer sends the data transmitted by the TCP 1 and the TCP 2 to the multi-path TCP layer, and the multi-path TCP layer determines that the TCP 1 and the TCP 2 connection belong to the same TCP connection according to the CID of the TCP 1 and the TCP 2, and then passes through the TCP. The data packets sent by the TCP 2 are aggregated and sent to the application layer of the first terminal.

As can be seen from the above, in the embodiment, the second terminal may save the first mapping relationship between the first address and the second address and the first HIP, thereby establishing a first TCP connection between the first address and the second address, and The process of establishing the first TCP connection carries the CID information, so after receiving the fourth address sent by the first terminal, the CID information can be used to establish a second TCP connection between the third address and the fourth address, thereby The same TCP application has at least two TCP connections, so that different TCP flows of one TCP application can be transmitted through different paths, so that the terminal supporting multiple access can take advantage of multiple access in the HIP network, and can improve the terminal and The efficiency of the use of the network.

It should be noted that, for each of the foregoing method embodiments, for the description of the package, it is expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Because certain steps may be performed in other sequences or concurrently in accordance with the present invention. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

The connection establishing apparatus provided by the embodiment of the present invention is further described below. FIG. 5 illustrates the structure of the connection establishing apparatus according to an embodiment of the present invention, including a host identity protocol association establishing unit 501, a saving unit 502, and a transmission control protocol connection establishing unit 503. And receiving unit 504.

The host identity protocol association establishing unit 501 is configured to establish a first address-to-first HIP association with the first terminal, and after the receiving unit 504 receives the fourth address sent by the first terminal,

The saving unit 502 is configured to: after the host identity association association establishing unit 501 establishes the first HIP association, save the first mapping relationship between the first address and the second address and the first HIP; and establish the first in the host identity protocol association establishing unit 501. After the second HIP is associated, the second mapping relationship between the third address and the fourth address and the second HIP is saved.

The transmission control protocol connection establishing unit 503 is configured to send the first TCP SYN 4 message to the first terminal by using the first address according to the first mapping relationship saved by the saving unit 502, to establish the first address and the first address of the second address. a TCP connection, the first TCP SYN packet includes the CID information, and the second TCP SYN packet is sent to the first terminal by using the third address according to the second mapping relationship saved by the saving unit 502. To establish a second TCP connection of the third address and the fourth address, the second TCP SYN message includes the CID information.

The receiving unit 504 is configured to receive a fourth address sent by the first terminal.

It can be seen that the connection establishing apparatus in this embodiment can save the first mapping relationship between the first address and the second address and the first HIP, thereby establishing a first TCP connection between the first address and the second address, and The process of establishing the first TCP connection carries the CID information, so after receiving the fourth address sent by the first terminal, the CID information can be used to establish a second TCP connection between the third address and the fourth address, thereby The same TCP application has at least two TCP connections, so that different TCP flows of one TCP application can be transmitted through different paths, so that the terminal supporting multiple access can take advantage of multiple access in the HIP network, and can improve the terminal and The efficiency of the use of the network.

Figure 6 is a diagram showing the structure of a connection establishing apparatus according to another embodiment of the present invention, including a host identification protocol association establishing unit 601, a saving unit 602, a transmission control protocol connection establishing unit 603, a receiving unit 604, and a transmitting unit 605.

The host identity protocol association establishing unit 601 is configured to establish a first address and a second HIP association of the first terminal, and after the receiving unit 604 receives the fourth address sent by the first terminal,

The saving unit 602 is configured to: after the host identity association association unit 601 establishes the first HIP association, save the first mapping relationship between the first address and the second address and the first HIP; and establish the first in the host identity protocol association establishing unit 601. After the second HIP is associated, the second mapping relationship between the third address and the fourth address and the second HIP is saved.

The transmission control protocol connection establishing unit 603 is configured to send, by using the first address, the first TCP SYN 4 message to the first terminal according to the first mapping relationship saved by the saving unit 602, to establish the first address and the first address of the second address. The TCP connection, the first TCP SYN message includes the CID information, and the second TCP SYN message is sent to the first terminal by using the third address according to the second mapping relationship saved by the saving unit 602, to establish the third address and the fourth address. The second TCP connection, the second TCP SYN message includes CID information.

The receiving unit 604 is configured to receive a fourth address sent by the first terminal.

The sending unit 605 is configured to send a fifth address to the first terminal after the transmission control protocol connection establishing unit 603 establishes the first TCP connection, so that the first terminal initiates the establishment of the sixth address and the fifth address. The third TCP connection.

As can be seen from the above, the connection establishing apparatus in this embodiment can save the first address and the second address and the first

a first mapping relationship associated with the HIP, thereby establishing a first TCP connection between the first address and the second address, and carrying CID information in the process of establishing the first TCP connection, thereby receiving the fourth sent by the first terminal After the address, the CID information can be used to establish a second TCP connection between the third address and the fourth address, so that at least two TCP connections can be applied to the same TCP, so that different TCP flows of one TCP application can pass different The path transmission enables the terminal supporting multiple access to take advantage of multiple access in the HIP network, and at the same time can improve the utilization efficiency of the terminal and the network. At the same time, after the first TCP connection is established, the fifth address is sent to the first terminal, so that the first terminal can initiate the establishment of the TCP connection, thereby further improving the utilization efficiency of the terminal and the network.

Figure 7 is a diagram showing the structure of a connection establishing apparatus according to another embodiment of the present invention, including a host identification protocol association establishing unit 701, a saving unit 702, a transmission control protocol connection establishing unit 703, a receiving unit 704, and a removing unit 705.

The host identity protocol association establishing unit 701 is configured to establish a first address and a second HIP association of the first terminal, and after the receiving unit 704 receives the fourth address sent by the first terminal,

The saving unit 702 is configured to: after the host identity association association establishing unit 701 establishes the first HIP association, save the first mapping relationship between the first address and the second address and the first HIP; and establish the first in the host identity protocol association establishing unit 701 After the second HIP is associated, the second mapping relationship between the third address and the fourth address and the second HIP is saved.

The transmission control protocol connection establishing unit 703 is configured to send the first TCP SYN 4 message to the first terminal by using the first address according to the first mapping relationship saved by the saving unit 702, to establish the first address and the first address of the second address. The TCP connection, the first TCP SYN packet includes the CID information; and the second TCP SYN packet is sent to the first terminal by using the third address according to the second mapping relationship saved by the saving unit 702, to establish the third address and the fourth address. The second TCP connection, the second TCP SYN message includes the CID information.

The receiving unit 704 is configured to receive the fourth address sent by the first terminal. After the second TCP connection is established, the transmission control protocol connection establishing unit 703 receives the information of the fourth address failure sent by the first terminal. The removing unit 705 is configured to determine, according to the second mapping relationship saved by the saving unit 702, that the fourth address corresponds to the second TCP connection, and remove the second TCP connection, after the receiving unit 704 receives the information of the fourth address failure.

It can be seen that the connection establishing apparatus in this embodiment can save the first mapping relationship between the first address and the second address and the first HIP, thereby establishing a first TCP connection between the first address and the second address, and The process of establishing the first TCP connection carries the CID information, so after receiving the fourth address sent by the first terminal, the CID information can be used to establish a second TCP connection between the third address and the fourth address, thereby The same TCP application has at least two TCP connections, so that different TCP flows of one TCP application can be transmitted through different paths, so that the terminal supporting multiple access can take advantage of multiple access in the HIP network, and can improve the terminal and The efficiency of the use of the network. At the same time, if the information of the fourth address failure is received after the second TCP connection is established, the second TCP connection can be removed, so that the resources of the terminal and the network can be effectively applied.

FIG. 8 illustrates the structure of a connection establishing apparatus according to an embodiment of the present invention, including a host identity protocol association establishing unit 801, a saving unit 802, a transmission control protocol connection establishing unit 803, and a receiving unit 804.

The host identity protocol association establishing unit 801 is configured to establish a first address and a second HIP association of the first terminal, and after the receiving unit 804 receives the fourth address sent by the first terminal,

The saving unit 802 is configured to: after the host identity association association unit 801 establishes the first HIP association, save the first mapping relationship between the first address and the second address and the first HIP; and establish the first in the host identity protocol association establishing unit 801. After the second HIP is associated, the third address and the fourth address are saved with the second

The second mapping relationship of the HIP association.

The transmission control protocol connection establishing unit 803 is configured to send the first TCP SYN 4 message to the first terminal by using the first address according to the first mapping relationship saved by the saving unit 802, to establish the first address and the first address of the second address. TCP connection, the first TCP SYN message includes CID information; according to the saving unit

The second mapping relationship saved by the 802 sends a second TCP SYN packet to the first terminal by using the third address to establish a second TCP connection between the third address and the fourth address, where the second TCP SYN packet includes the CID information.

As shown in FIG. 8, in one embodiment of the present invention, a transmission control protocol connection establishing unit 803 A message transmitting unit 8031 and a message receiving unit 8032 may be included. The message sending unit 8031 is configured to send, by using the first address, the first TCP SYN message to the first terminal according to the first mapping relationship; after the message receiving unit 8032 receives the first TCP SYN/ACK message, pass the first The address sends a TCP ACK packet to the second address to complete the establishment of the first TCP connection. The message receiving unit 8032 is configured to receive a first TCP SYN/ACK message returned by the second address, where the first TCP SYN/ACK message includes CID information, and the first TCP SYN/ACK message is received by the second address. After the first TCP SYN packet is forwarded by the terminal, the first terminal forwards the first TCP SYN packet to the second address according to the saved first mapping relationship.

The receiving unit 804 is configured to receive a fourth address sent by the first terminal.

a first mapping relationship associated with the HIP, thereby establishing a first TCP connection between the first address and the second address, and carrying CID information in the process of establishing the first TCP connection, thereby receiving the fourth sent by the first terminal After the address, the CID information can be used to establish a second TCP connection between the third address and the fourth address, so that at least two TCP connections can be applied to the same TCP, so that different TCP flows of one TCP application can pass different The path transmission enables the terminal supporting multiple access to take advantage of multiple access in the HIP network, and at the same time can improve the utilization efficiency of the terminal and the network.

An embodiment of the present invention further provides a communication system, which includes the connection establishment apparatus provided by the embodiment of the present invention.

For the information exchange, the execution process, and the like between the above-mentioned devices and the modules in the system, the content is the same as that of the method embodiment of the present invention. For details, refer to the description in the method embodiment of the present invention, and details are not described herein again.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium, the program When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM). The description of the examples is only for helping to understand the method and the idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there are some changes in the specific embodiments and application scopes. In summary, the content of the specification should not be construed as limiting the invention.

Claims

Rights request

A connection establishment method, comprising:

The connection establishment method according to claim 1, wherein the establishing the first address and the second address of the first transmission control protocol connection further comprises:

The second terminal sends the fifth address of the second terminal to the first terminal, so that the first terminal initiates establishing a third transmission control protocol connection between the sixth address of the first terminal and the fifth address.

The method for establishing a connection according to claim 1, wherein the establishing the third address and the second transmission control protocol of the fourth address further comprises:

Receiving, by the second terminal, information that the fourth address is invalid, that is sent by the first terminal;

The second terminal determines, according to the second mapping relationship, that the fourth address corresponds to the second transmission control protocol connection, and removes the second transmission control protocol connection.

The method for establishing a connection according to any one of claims 1 to 3, wherein the second terminal sends the first transmission control to the first terminal by using the first address according to the first mapping relationship. The protocol synchronization is configured to establish the first transmission control protocol connection between the first address and the second address, including: Transmitting, by the second terminal, the first transmission control protocol synchronization message to the first terminal by using the first address according to the first mapping relationship;

Receiving, by the second terminal, a first transmission control protocol synchronization and acknowledgement message returned by the second address, where the first transmission control protocol synchronization and acknowledgement message includes the connection identifier information, and the first transmission control protocol is synchronized. And sending, by the second address, the first transmission control protocol synchronization message that is forwarded by the first terminal, and the first terminal, according to the saved first mapping relationship, Transmitting a control control protocol synchronization message to the second address;

And transmitting, by the first terminal, the transmission control protocol confirmation message to the second address by using the first address, and completing establishment of the first transmission control protocol connection.

A connection establishing apparatus, comprising: a host identity protocol association establishing unit, a saving unit, a transmission control protocol connection establishing unit, and a receiving unit;

The saving unit is configured to save, after the establishing, by the host identity protocol association establishing unit, the first mapping, the first mapping associated with the first host identity protocol a second mapping relationship between the third address and the fourth address and the second host identity protocol is saved after the host identity protocol association establishing unit establishes the second host identity protocol association;

The connection establishing apparatus according to claim 5, wherein the connection establishing apparatus further comprises: a sending unit, configured to send a fifth address to the first terminal after the first transmission control protocol connection is established by the transmission control protocol connection establishing unit, so that the first terminal initiates establishment of a sixth address and location The third transmission control protocol connection of the fifth address.

The connection establishing apparatus according to claim 5, wherein the receiving unit is further configured to: after the transmission control protocol connection establishing unit establishes the second transmission control protocol connection, receive the first Information that the fourth address is invalidated by the terminal;

The connection establishing apparatus further includes a removing unit, configured to determine, according to the second mapping relationship saved by the saving unit, that the fourth address corresponds to the second transmission, after the receiving unit receives the information of the fourth address failure Controlling the protocol connection and tearing down the second transmission control protocol connection.

The connection establishing apparatus according to any one of claims 5 to 7, wherein the transmission control protocol connection establishing unit comprises a message sending unit and a message receiving unit;

The message sending unit is configured to send, by using the first address, a first transmission control protocol synchronization message to the first terminal according to the first mapping relationship; and receiving, by the packet receiving unit, the first transmission After the control protocol is synchronized and acknowledged, the transmission control protocol acknowledgement packet is sent to the second address by using the first address, and the establishment of the first transmission control protocol connection is completed;

The message receiving unit is configured to receive a first transmission control protocol synchronization and acknowledgment message returned by the second address, where the first transmission control protocol synchronization and acknowledgment message includes the connection identifier information, The first transmission control protocol synchronization and acknowledgment message is sent by the second address to the first transmission control protocol synchronization message forwarded by the first terminal, and the first terminal is saved according to the first The mapping relationship forwards the first transmission control protocol synchronization message to the second address.

A communication system, comprising the connection establishing device according to any one of claims 5 to 8.