CN109587749B - Data sending method and system - Google Patents
Data sending method and system Download PDFInfo
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- CN109587749B CN109587749B CN201811584413.3A CN201811584413A CN109587749B CN 109587749 B CN109587749 B CN 109587749B CN 201811584413 A CN201811584413 A CN 201811584413A CN 109587749 B CN109587749 B CN 109587749B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
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Abstract
The invention discloses a data sending method and a system, wherein the method comprises the following steps: a virtual network card configured on a terminal performs first-layer encapsulation on received data to be sent, and sends a first data packet obtained after the first-layer encapsulation to a network protocol stack; the network protocol stack carries out second-layer encapsulation on the first data packet, and a second data packet obtained after the second-layer encapsulation is sent to the proxy service through the current network; and the proxy server decapsulates the second data packet to obtain the first data packet, and sends the first data packet to the receiving end. The data sending method and the system provided by the embodiment of the invention realize uninterrupted communication connection of the mobile station under the condition of network switching.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method and system.
Background
The intelligent terminal can realize various functions through accessing the network, and brings great convenience to the daily life of people.
When the intelligent terminal cannot be continuously connected with the current network, the intelligent terminal can be switched to be connected with another network according to the current network strategy, the intelligent terminal needs to re-identify the switched network due to the change of the network IP address, the connection established before switching cannot be carried out after switching, and the file downloading service in the switching process or the network conversation can be interrupted. Therefore, the network switching in the data transmission process may cause the occurrence of phenomena such as data transmission interruption, delay, packet loss, and the like, thereby affecting the user experience.
Disclosure of Invention
The invention provides a data transmission method and a data transmission system, which are used for realizing uninterrupted communication connection of a mobile station under the condition of network switching.
In a first aspect, an embodiment of the present invention provides a data sending method, including:
a virtual network card configured on a terminal performs first-layer encapsulation on received data to be sent, and sends a first data packet obtained after the first-layer encapsulation to a network protocol stack, wherein the first-layer encapsulation comprises setting a source IP address of the data to be sent as a static IP address of the virtual network card, and setting a destination IP address of the data to be sent as a receiving end IP address;
the network protocol stack carries out second-layer encapsulation on the first data packet, and a second data packet obtained after the second-layer encapsulation is sent to a proxy server through a current network, wherein the second-layer encapsulation comprises the steps of setting a source IP address of the first data packet as a network card IP address corresponding to the current network and setting a destination IP address of the first data packet as a proxy server IP address;
and the proxy server decapsulates the second data packet to obtain the first data packet, and sends the first data packet to the receiving end.
In a second aspect, an embodiment of the present invention further provides a data transmission system, where the system includes a virtual network card, a network protocol stack, and a proxy server, where,
the virtual network card is used for performing first-layer packaging on received data to be sent and sending a first data packet obtained after the first-layer packaging to the network protocol stack, wherein the first-layer packaging comprises setting a source IP address of the data to be sent as a static IP address of the virtual network card and setting a destination IP address of the data to be sent as a receiving end IP address;
the network protocol stack is used for performing second-layer encapsulation on the first data packet, and sending a second data packet obtained after the second-layer encapsulation to the proxy server through a current network, wherein the second-layer encapsulation comprises the steps of setting a source IP address of the first data packet as a network card IP address corresponding to the current network and setting a destination IP address of the first data packet as a proxy server IP address;
the proxy server is used for decapsulating the second data packet to obtain the first data packet, and sending the first data packet to the receiving end.
The invention carries out first layer encapsulation to the received data to be sent through the virtual network card on the mobile terminal to obtain the static IP address of the source IP address of the virtual network card, the destination IP address is the first data packet of the IP address of the receiving end, and sends the first data packet to the network protocol stack, the network protocol stack carries out second layer encapsulation to the received first data packet to obtain the IP address of the network card of which the source IP address is corresponding to the current real network, the destination IP address is the proxy server and sends the second data packet to the proxy server through the current network, the proxy server carries out decapsulation to the received second data packet to obtain the first data packet and sends the first data packet to the receiving end, because the source IP address of the first data packet sent to the receiving end is the static IP address of the virtual network card, and the static IP address of the virtual network card is fixed, therefore in the data sending process, even if the network connection is switched, the source IP address of the data packet received by the receiving end can be ensured to be unchanged, thereby ensuring the uninterrupted communication service and improving the data transmission efficiency and quality.
Drawings
Fig. 1 is a flowchart of a data transmission method according to an embodiment of the present invention;
fig. 2 is a flowchart of a data transmission method according to a second embodiment of the present invention;
fig. 3 is a schematic frame diagram of a data transmission method according to a second embodiment of the present invention;
fig. 4 is a structural diagram of a data transmission system according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a data sending method according to an embodiment of the present invention, where this embodiment is applicable to a case of sending data in an application program communication process, and the method may be executed by a data sending system including a virtual network card, a network protocol stack, and a proxy server configured on a terminal, as shown in fig. 1, the method specifically includes the following steps:
s110, a virtual network card configured on the terminal performs first-layer packaging on the received data to be sent, and sends a first data packet obtained after the first-layer packaging to a network protocol stack.
The terminal can be a mobile terminal such as a mobile phone and a computer, a virtual network card is configured on the terminal and a corresponding fixed static IP address is added, the virtual network card performs first-layer encapsulation on received data to be sent, the adopted encapsulation format is that a source IP address of the data to be sent is set as the static IP address of the virtual network card, a destination IP address of the data to be sent is set as the IP address of a receiving end, and a first data packet obtained after encapsulation is sent to a network protocol stack.
And S120, performing second-layer encapsulation on the first data packet by the network protocol stack, and transmitting a second data packet obtained after the second-layer encapsulation to the proxy server through the current network.
Specifically, if the currently connected network is a Wi-Fi network, the source IP address of the received first data packet is set as the IP address of the WLAN network card corresponding to the current Wi-Fi network, the destination IP address of the first data packet is set as the IP address of the proxy server, and the second data packet after the second layer encapsulation is obtained and sent to the proxy server through the network accessed by the current terminal.
S130, the proxy server decapsulates the second data packet to obtain a first data packet, and sends the first data packet to a receiving end.
The proxy server decapsulates the received second data packet, specifically, after receiving the second data packet, the proxy server decapsulates an outer layer IP header of the second data packet to obtain an inner layer first data packet, and further, the proxy server performs network address translation on the decapsulated first data packet, that is, rewrites a source IP address of the first data packet into an IP address of the proxy server, where the source IP address of the first data packet is an IP address of the proxy server and a destination address is an IP address of a receiving end, and sends the rewritten first data packet to the receiving end, thereby completing data transmission in the mobile communication process.
Further, during the process of establishing the TCP connection for data transmission by the application program in the mobile terminal, if the network connected with the mobile terminal changes, for example, the mobile terminal is switched from the Wi-Fi network currently connected to the mobile network, at this time, since the static IP address of the virtual network card configured in the terminal is fixed, i.e. the IP address of the data sender is always kept unchanged, therefore, during the data sending process, the IP address and port bound by the TCP connection maintained by the application program in the mobile terminal always exist, therefore, the established TCP communication between the application programs in the mobile terminal is not interrupted, the network conversation, file downloading and other operations performed by the user before and after the network switch are not interrupted, therefore, the problems of data transmission interruption, delay, namely packet loss and the like caused by network switching are avoided, and the data transmission efficiency and quality are improved.
In the technical scheme of this embodiment, a first layer of encapsulation is performed on received data to be sent through a virtual network card on a mobile terminal to obtain a static IP address with a source IP address as the virtual network card, a destination IP address is a first data packet with a receiving end IP address, the first data packet is sent to a network protocol stack, the network protocol stack performs a second layer of encapsulation on the received first data packet to obtain a source IP address as an IP address of a network card corresponding to a current real network, the destination IP address is a proxy server and sends a second data packet to the proxy server through the current network, the proxy server decapsulates the received second data packet to obtain the first data packet and sends the first data packet to the receiving end, because the source IP address of the first data packet sent to the receiving end is the static IP address of the virtual network card and the static IP address of the virtual network card is fixed, therefore, in the data sending process, even if network connection is switched, the source IP address of the data packet received by the receiving end can be ensured to be unchanged, thereby ensuring that the communication service is not interrupted and improving the data transmission efficiency and quality.
Example two
Fig. 2 is a flowchart of a data sending method according to a second embodiment of the present invention, where this embodiment further includes establishing TCP connection communication between a sending end and a receiving end on a terminal before a virtual network card configured on the terminal performs first-layer encapsulation on received data to be sent; and the sending end sends the data to be sent to the virtual network card. As shown in fig. 2, the method specifically includes the following steps:
s210, TCP connection communication is established between the sending end and the receiving end on the terminal.
Specifically, the sending end may refer to an application program on the mobile terminal, referring to fig. 3, and fig. 3 is a schematic frame diagram of a data sending method according to a second embodiment of the present invention. First, an application (not shown) in the mobile terminal 310 establishes TCP connection communication with a receiving end 330 of the internet having an IP address 166.32.65.98.
And S220, the sending end sends the data to be sent to the virtual network card.
After the TCP communication between the sending end and the receiving end 330 is established, the application program as the sending end needs to send data to the receiving end 330 with IP address 166.32.65.98, and at this time, the data to be sent is sent to the virtual network card 312 according to the default route by setting the default route.
S230, the virtual network card 312 configured on the terminal performs first-layer encapsulation on the received data to be sent, and sends a first data packet obtained after the first-layer encapsulation to the network protocol stack.
Specifically, the static IP address of the virtual network card is fixed to 10.1.10.2, and the virtual network card 312 performs first-layer encapsulation on the received TCP data to be sent, where the encapsulation format is: the source IP address of the data to be sent is set to 10.1.10.2, that is, the static IP address of the virtual network card 312, and the destination IP address of the data to be sent is set to 166.32.65.98, that is, the IP address of the receiving end 330, the data to be sent is encapsulated by the first layer to obtain a first data packet, and the first data packet is sent from the virtual network card 312 to the network protocol stack.
S240, the network protocol stack encapsulates the first data packet on the second layer, and the second data packet obtained after the second layer is encapsulated is sent to the proxy server through the current network.
According to the currently connected network, referring to fig. 3, the currently connected network may be a WI-FI network, the second layer encapsulation is performed on the received first data packet, specifically, the source IP address of the first data packet is set to be the IP address of the WLAN network card 311, specifically 192.168.1.5, the WLAN network card performs data transmission by accessing between the internet 340 and the proxy server 320, the destination IP address of the first data packet is set to be the IP address of the network protocol stack, specifically 163.52.48.33, the second layer encapsulation is performed to obtain a second data packet, and the second data packet is sent to the proxy server 320 through the WI-FI network connected to the current mobile terminal 310.
S250, the proxy server decapsulates the second data packet to obtain a first data packet, and sends the first data packet to a receiving end.
The proxy server 320 is proxy service software running on a Linux host, and decapsulates the received second data packet to obtain a first data packet, that is, a data packet with a source IP address of 10.1.10.2 and a destination IP address of 166.32.65.98, the proxy server 320 performs network address transfer on the decapsulated first data packet, that is, the source address of the first data packet is rewritten to its own IP address 163.52.48.33, the source IP address of the rewritten first data packet is 163.52.48.33, the destination IP is 166.32.65.98, and the rewritten first data packet is sent to the receiving end 330 through the currently connected Wi-Fi network.
At this time, if the mobile terminal switches the connected network, for example, the mobile terminal switches from the currently connected Wi-Fi network to the mobile 4G network, at this time, the 4G network card 313 in the mobile terminal accesses the mobile network through the mobile core network 350, and since the static IP of the virtual network card 312 is fixed, that is, the data sending port and the IP address of the port bound to the TCP connection communication established between the receiving end and the sending end are not changed, the TCP connection communication established before and after the network switching is not interrupted.
According to the technical scheme of the embodiment, firstly, a TCP communication connection is established between an application program in a terminal and an end point in the interconnection, the application program in the terminal is used as a sending end to send data to a receiving end, the application program is bound with a virtual network card in the communication process, and in the process of sending the data to the receiving end by the sending end, because the static IP address of the virtual network card is fixed and unchanged, the IP address and the port bound with the TCP connection communication established between the application programs exist all the time, the TCP connection communication established originally cannot be interrupted under the condition of network switching.
EXAMPLE III
Fig. 4 is a structural diagram of a data transmission system according to a third embodiment of the present invention. The data transmission method provided in any embodiment of the present invention may be executed, and referring to fig. 4, the data transmission system provided in the embodiment of the present invention includes: a virtual network card 410, a network protocol stack 420 and a proxy server 430 configured on the terminal.
The virtual network card 410 is configured to perform first-layer encapsulation on received data to be sent, and send a first data packet obtained after the first-layer encapsulation to the network protocol stack, where the first-layer encapsulation includes setting a source IP address of the data to be sent as a static IP address of the virtual network card, and setting a destination IP address of the data to be sent as a receiving-end IP address.
And the network protocol stack 420 is configured to perform second layer encapsulation on the first data packet, and send a second data packet obtained after the second layer encapsulation to the proxy server through the current network, where the second layer encapsulation includes setting a source IP address of the first data packet as a network card IP address corresponding to the current network, and setting a destination IP address of the first data packet as a proxy server IP address.
And the proxy server 430 is configured to decapsulate the second data packet to obtain a first data packet, and send the first data packet to the receiving end.
Specifically, the decapsulation module 430 is specifically configured to: and rewriting the static IP address of the virtual network card in the first data packet into the IP address of the proxy server, and sending the rewritten first data packet to a receiving end based on the IP address of the receiving end in the first data packet.
The technical scheme of the embodiment of the invention is that a first layer of encapsulation is carried out on received data to be sent through a virtual network card on a mobile terminal to obtain a static IP address of the virtual network card at a source IP address, a first data packet at a target IP address of a receiving end IP address, the first data packet is sent to a network protocol stack, the network protocol stack carries out second layer of encapsulation on the received first data packet to obtain an IP address of a network card corresponding to a current real network at the source IP address, the target IP address is a proxy server and sends the second data packet to the proxy server through the current network, the proxy server carries out decapsulation on the received second data packet to obtain the first data packet and sends the first data packet to the receiving end, and the static IP address of the virtual network card is fixed in the data sending process, so that even if network connection is switched in the data sending process, the uninterrupted communication service can be ensured.
In this embodiment, the data transmission system further includes: and the communication module is configured on the terminal.
Specifically, a communication module configured on the terminal is configured to establish TCP connection communication between a sending end and a receiving end on the terminal, where the sending end is configured to send data to be sent to the virtual network card.
The data transmission system provided by the embodiment of the invention can execute the data transmission method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (4)
1. A method for transmitting data, the method comprising:
a virtual network card configured on a terminal performs first-layer encapsulation on received data to be sent, and sends a first data packet obtained after the first-layer encapsulation to a network protocol stack, wherein the first-layer encapsulation comprises setting a source IP address of the data to be sent as a static IP address of the virtual network card, and setting a destination IP address of the data to be sent as a receiving end IP address;
the network protocol stack carries out second-layer encapsulation on the first data packet, and a second data packet obtained after the second-layer encapsulation is sent to a proxy server through a current network, wherein the second-layer encapsulation comprises the steps of setting a source IP address of the first data packet as a network card IP address corresponding to the current network and setting a destination IP address of the first data packet as a proxy server IP address;
the proxy server decapsulates the second data packet to obtain the first data packet, and sends the first data packet to the receiving end;
the sending, by the proxy server, the first data packet to the receiving end includes:
and the proxy server rewrites the static IP address of the virtual network card in the first data packet into the IP address of the proxy server, and sends the rewritten first data packet to the receiving end based on the IP address of the receiving end in the first data packet.
2. The method according to claim 1, wherein before the virtual network card configured on the terminal performs the first layer encapsulation on the received data to be sent, the method further comprises:
a TCP connection communication is established between a sending end on a terminal and the receiving end;
and the sending end sends the data to be sent to the virtual network card.
3. A data transmission system is characterized in that the system comprises a virtual network card, a network protocol stack and a proxy server which are configured on a terminal,
the virtual network card is used for performing first-layer packaging on received data to be sent and sending a first data packet obtained after the first-layer packaging to the network protocol stack, wherein the first-layer packaging comprises setting a source IP address of the data to be sent as a static IP address of the virtual network card and setting a destination IP address of the data to be sent as a receiving end IP address;
the network protocol stack is used for performing second-layer encapsulation on the first data packet, and sending a second data packet obtained after the second-layer encapsulation to the proxy server through a current network, wherein the second-layer encapsulation comprises the steps of setting a source IP address of the first data packet as a network card IP address corresponding to the current network and setting a destination IP address of the first data packet as a proxy server IP address;
the proxy server is used for decapsulating the second data packet to obtain the first data packet and sending the first data packet to the receiving end;
the proxy server is specifically configured to: and rewriting the static IP address of the virtual network card in the first data packet into the IP address of the proxy server, and sending the rewritten first data packet to the receiving end based on the IP address of the receiving end in the first data packet.
4. The system of claim 3, further comprising:
the communication module is configured on the terminal and used for establishing TCP connection communication between a sending end and the receiving end on the terminal;
the sending end is used for sending the data to be sent to the virtual network card.
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| CN103001751B (en) * | 2012-12-18 | 2015-01-07 | 华中科技大学 | Cross-layer ARQ (Automatic Repeat Request) method in LTE-WLAN (Long Term Evolution and Wireless Local Area Network) heterogeneous wireless network system |
| KR101689012B1 (en) * | 2015-06-29 | 2016-12-22 | 주식회사 케이티 | Network apparatus and terminal for multinet aggregation transmission, and operating method thereof |
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