WO2016058424A1

WO2016058424A1 - Data transmission method, device and system, and storage medium

Info

Publication number: WO2016058424A1
Application number: PCT/CN2015/083993
Authority: WO
Inventors: 汤德龙
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-10-15
Filing date: 2015-07-14
Publication date: 2016-04-21
Also published as: CN105577565A

Abstract

Provided is a data transmission method, comprising: receiving a downlink packet from the Internet, caching the downlink packet, and sending same to an access gateway; and within a pre-set time, detecting whether an acknowledgement packet from the access gateway is received, and deleting the cached downlink packet when the acknowledgement packet from the access gateway is received, otherwise, resending the downlink packet to the access gateway. Also provided are additional two data transmission methods, two data transmission devices, one data transmission system and three storage mediums.

Description

Data transmission method, device, system and storage medium

Technical field

The present invention relates to wireless communication technologies, and in particular, to a data transmission method, apparatus, system, and storage medium.

Background technique

The protocol mainly used in the terrestrial part of the transmission data service in the wireless network is the General Packet Radio Service Tunnel Protocol (GTP), and the 3rd Generation Partnership Project (3GPP, The 3rd Generation Partnership Project) No. 29.060 The protocol, the GTP protocol itself does not guarantee the reliability of the transmission, and the GTP protocol User Datagram Protocol (UDP)/Internet Protocol (IP) protocol cannot guarantee the transmission quality.

The current transmission mechanism is no problem in the second generation wireless communication technology (2G, ^2nd Generation), because the early transmission network networking is simple, the bandwidth is relatively abundant, and the ground transmission basically does not cause congestion and packet loss; Moreover, the early user's data traffic is not high, and the jitter is not obvious. Therefore, through reasonable planning, the GTP protocol can achieve better transmission results.

However, with the rapid development of the Internet and the user's pursuit of the diversity of Internet services, the situation has undergone tremendous changes. These changes are mainly reflected in: (1) the traffic characteristics of users' data services become difficult to predict, which is mainly manifested in different traffic characteristics of different services; for example, video services require large and stable traffic, and download services It will try to preempt the bandwidth and not pay attention to the stability of the traffic. Users may use these services at any time and place. (2) The complexity of networking increases, and the early single-system networking becomes a multi-standard collaborative networking. The Asynchronous Transfer Mode (ATM) network is replaced with an IP network. In the current situation, the traditional data transmission method will face some new problems: the loss of the wireless system becomes severe, which requires the application layer's Transmission Control Protocol (TCP) to sense and resend. The retransmission of the application layer may have a greater impact on the user experience due to delays. At the same time, the TCP of the application layer will enable the congestion control mechanism once it detects packet loss and resends. This mechanism has certain conflicts with the wireless system. Will cause the bandwidth utilization of the wireless system to decrease. This phenomenon is the third generation of wireless communication technology (3G, 3 ^rd Generation) wireless network has a certain expression, and will become the fourth generation of wireless communication technology (4G, 4 ^th Generation) network and even the future of wireless network serious.

Summary of the invention

In view of this, embodiments of the present invention are directed to providing a data transmission method, apparatus, system, and storage medium, which can effectively solve the problem of high-efficiency data transmission in a complex wireless network scenario.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides a data transmission method, where the method includes:

Receiving a downlink packet from the Internet, buffering the downlink packet, and sending the downlink packet to the access gateway;

Detecting whether an acknowledgment message from the access gateway is received, and deleting the buffered downlink packet when receiving the acknowledgment message from the access gateway; otherwise, resending the downlink packet Go to the access gateway.

In the above solution, when the downlink packet is buffered, the method further includes: starting a timer;

Correspondingly, the detecting, in the preset time, whether the acknowledgment message from the access gateway is received is: detecting whether an acknowledgment message from the access gateway is received within a preset time of the timer;

Correspondingly, when receiving the acknowledgement message from the access gateway, the method further comprises: turning off the timer.

In the above solution, the method further includes: when the repeated number of times the same packet is repeatedly sent reaches a preset threshold, and the acknowledgement packet is not received, the exception processing procedure is started.

In the foregoing solution, the sending the downlink packet to the access gateway includes: directly sending the downlink packet to the access gateway, and/or sending the downlink packet to the access gateway by using an intermediate gateway;

Correspondingly, the detecting whether the acknowledgment message from the access gateway is received includes: detecting whether an acknowledgment message directly from the access gateway is received, and/or an acknowledgment message sent by the access gateway through the intermediate gateway.

The embodiment of the invention further provides a data transmission method, the method comprising:

Receiving a downlink packet from the top-level gateway, and sending the downlink packet to the terminal;

Receiving an acknowledgment message sent by the terminal, when receiving the acknowledgment message, constructing an acknowledgment message, and sending the acknowledgment message to the top-level gateway.

The top-level gateway receives the downlink packet from the Internet, caches the downlink packet, and sends the downlink packet to the access gateway;

The access gateway sends the downlink packet to the terminal; the acknowledgment message sent by the terminal, when receiving the acknowledgment message, constructs an acknowledgment message, and sends the acknowledgment message to the top-level gateway;

The apex gateway detects whether the acknowledgment message from the access gateway is received within the preset time. When receiving the acknowledgment message from the access gateway, the cached downlink packet is deleted; otherwise, the downlink packet is received. Resend to the access gateway.

In the above solution, when the top-level gateway caches the downlink packet, the method further includes: starting a timer;

Correspondingly, the apex gateway detects whether the acknowledgment message from the access gateway is received within a preset time period: detecting whether an acknowledgment message from the access gateway is received within a preset time of the timer;

Correspondingly, when the top-level gateway receives the acknowledgement message from the access gateway, the method further includes: turning off the timer.

In the above solution, the method further includes: when the number of times the same packet is repeatedly sent reaches a preset threshold, and the acknowledgment message is not received, the top gateway starts an exception processing procedure.

In the foregoing solution, the sending, by the top-level gateway, the downlink packet to the access gateway includes: sending, by the top-level gateway, the downlink packet to the access gateway, and/or sending the downlink packet to the intermediate gateway Access gateway

Correspondingly, the detecting, by the top-level gateway, whether the acknowledgment message is received from the access gateway comprises: detecting, by the top-level gateway, whether an acknowledgment message directly from the access gateway is received, and/or the access gateway sends the message through the intermediate gateway. Confirm the message.

The embodiment of the present invention further provides a data transmission device, where the device is located at a top-level gateway, and the device includes: a downlink packet receiving module, a cache module, a downlink packet sending module, an acknowledgement packet receiving module, and a processing module; ,

The downlink packet receiving module is configured to receive a downlink packet from the Internet;

The cache module is configured to cache the downlink packet.

The downlink packet sending module is configured to send the downlink packet to an access gateway;

The acknowledgement message receiving module is configured to receive an acknowledgement message from the access gateway;

The processing module is configured to detect whether an acknowledgment message from the access gateway is received within a preset time, and when the acknowledgment message from the access gateway is received, delete the cached downlink message; otherwise, The downlink packet is resent to the access gateway.

In the above solution, the device further includes a timer, configured to enable a timing function when the downlink packet is buffered;

Correspondingly, the processing module is configured to detect whether an acknowledgement message from the access gateway is received within a preset time of the timer;

When receiving an acknowledgment message from the access gateway, the processing module is further configured to: close the timer.

In the above solution, the processing module is further configured to: when the same packet is repeatedly sent When the preset threshold has not received the confirmation packet, the exception handling process is started.

In the above solution, the downlink packet sending module is configured to: directly send the downlink packet to the access gateway, and/or send the downlink packet to the access gateway through the intermediate gateway;

Correspondingly, the processing module is configured to: detect whether an acknowledgment message directly from the access gateway is received, and/or an acknowledgment message sent by the access gateway through the intermediate gateway.

The embodiment of the present invention further provides a data transmission device, where the device is located in an access gateway, and the device includes: a downlink packet receiving module, a downlink packet sending module, an acknowledgement message receiving module, an acknowledgement message building module, and a confirmation. Message sending module, wherein

The downlink packet receiving module is configured to receive a downlink packet from the top-level gateway;

The downlink packet sending module is configured to send the downlink packet to the terminal;

The confirmation message receiving module is configured to receive an acknowledgement message sent by the terminal;

The confirmation message construction module is configured to: when receiving the confirmation message, construct an acknowledgement message;

The acknowledgement message sending module is configured to send the acknowledgement message to the top-level gateway.

An embodiment of the present invention further provides a data transmission system, where the system includes a top-level gateway and an access gateway, where

The top-level gateway is configured to receive a downlink packet from the Internet, cache the downlink packet, and send the packet to the access gateway, and detect whether the acknowledgement packet from the access gateway is received within a preset time. And when the acknowledgment message from the access gateway is received, the buffered downlink packet is deleted; otherwise, the downlink packet is resent to the access gateway;

The access gateway is configured to send the downlink packet to the terminal, and receive an acknowledgement message sent by the terminal. When receiving the acknowledgement message, construct an acknowledgement message, and send the acknowledgement packet to the top-level gateway. .

In the above solution, the top-level gateway is further configured to start a timer when the downlink packet is buffered;

Correspondingly, the top-level gateway is configured to: detect whether an acknowledgement message from the access gateway is received within a preset time of the timer;

When the top-level gateway receives the acknowledgement message from the access gateway, the top-level gateway is further configured to: close the timer.

In the foregoing solution, the top-level gateway is further configured to start an exception processing process when the number of times that the same packet is repeatedly sent reaches a preset threshold and the acknowledge packet is not received.

In the above solution, the top-level gateway is configured to: directly send the downlink packet to the access gateway, and/or send the downlink packet to the access gateway through the intermediate gateway;

It is detected whether an acknowledgment message directly from the access gateway and/or an acknowledgment message sent by the access gateway through the intermediate gateway are received.

The embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a computer program for performing the first data transmission method of the embodiment of the present invention.

The embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a computer program for performing the second data transmission method of the embodiment of the present invention.

The embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a computer program for performing a third data transmission method of the embodiment of the present invention.

The data transmission method, device, system and storage medium provided by the embodiment of the present invention, the top-level gateway receives the downlink packet from the Internet, caches the downlink packet, and sends the downlink packet to the access gateway; the access gateway will Sending the downlink message to the terminal; receiving the acknowledgement message sent by the terminal, when receiving the acknowledgement message, constructing the acknowledgement message, and sending the acknowledgement message to the top-level gateway; the top-level gateway detects in the preset time Whether the acknowledgement packet from the access gateway is received, and when the acknowledgement packet from the access gateway is received, the buffered downlink packet is deleted; Otherwise, the downlink message is resent to the access gateway. In this way, the retransmission mechanism of the downlink packet is introduced in the wireless system, so that the packet loss in the wireless system can be retransmitted more quickly, and the problem of high-efficiency data transmission in the complex wireless network scenario is effectively solved, thereby improving the user experience. And optimize the bandwidth efficiency of the wireless system.

DRAWINGS

1 is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

2 is a schematic flowchart of a data transmission method according to Embodiment 2 of the present invention;

3 is a schematic flowchart of a data transmission method according to Embodiment 3 of the present invention;

4 is a schematic flowchart of a data transmission method according to Embodiment 4 of the present invention;

FIG. 5 is a schematic flowchart of a data transmission method according to Embodiment 5 of the present invention; FIG.

6 is a schematic flowchart of a data transmission method according to Embodiment 6 of the present invention;

7 is a schematic flowchart of a data transmission method according to Embodiment 7 of the present invention;

FIG. 8 is a schematic flowchart of a data transmission method according to Embodiment 8 of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention; FIG.

10 is a schematic structural diagram of a data transmission apparatus according to Embodiment 2 of the present invention;

FIG. 11 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention.

detailed description

In the data transmission method of the embodiment of the present invention, the top-level gateway receives the downlink packet from the Internet, caches the downlink packet, and sends the downlink packet to the access gateway; the access gateway sends the downlink packet to the terminal; The acknowledgment message sent by the terminal, when receiving the acknowledgment message, constructs an acknowledgment message, and sends the acknowledgment message to the top-level gateway; the top-level gateway detects whether the acknowledgement message from the access gateway is received within a preset time. If the acknowledgement packet from the access gateway is received, the buffered downlink packet is deleted; otherwise, the downlink packet is resent to the access gateway.

The top-level gateway starts a timer when the downlink packet is buffered, and detects whether an acknowledgement packet from the access gateway is received within a preset time of the timer; when the top-level gateway receives the The timer is turned off when the gateway acknowledges the packet.

When the number of repeated transmissions of the same packet reaches the preset threshold and the acknowledgement packet is not received, the top-level gateway starts an exception processing procedure.

Here, the sending, by the top-level gateway, the downlink packet to the access gateway includes: directly sending the downlink packet to the access gateway, and/or sending the downlink packet to the access gateway by using an intermediate gateway; And detecting, by the top-level gateway, whether the acknowledgment message from the access gateway is received includes: detecting whether an acknowledgment message directly from the access gateway is received, and/or an acknowledgment message sent by the access gateway through the intermediate gateway.

The implementation of the technical solution of the embodiment of the present invention is described in detail below with reference to the accompanying drawings and embodiments. FIG. 1 is a schematic flowchart of a data transmission method according to an embodiment of the present invention. As shown in FIG. 1 , a data transmission method according to an embodiment of the present invention includes the following steps:

Step 101: Receive a downlink message from the Internet;

Step 102: Cache the downlink packet and send it to the access gateway.

Here, the access gateway refers to a gateway that cooperates with the terminal to complete the interaction of the user data in the air interface, and the access gateway is generally responsible for the radio resource management and the transmission and reception of the terminal data packet in the air interface, but is not limited to the above functions, and the access gateway Not limited to one physical entity.

In the embodiment of the present invention, before the downlink packet is buffered and sent, the method further includes: encapsulating the received downlink packet data; and the field for encapsulating the downlink packet includes: The unique identifier of the downlink packet;

In this step, when the downlink packet is buffered, the method further includes: starting a timer;

The sending the downlink packet to the access gateway includes: directly sending the encapsulated downlink packet to the access gateway, and/or sending the encapsulated downlink packet to the access through the intermediate gateway. Gateway

Step 103: Detecting whether an acknowledgment message from the access gateway is received, and when receiving the acknowledgment message from the access gateway, step 103 is performed; otherwise, step 104 is performed;

In this step, the detecting, by the preset time, whether the acknowledgment message from the access gateway is received is: detecting whether an acknowledgment message from the access gateway is received within a preset time of the timer; The preset time can be set according to the networking conditions.

The detecting whether the acknowledgment message from the access gateway is received includes: detecting whether an acknowledgment message directly from the access gateway is received, and/or an acknowledgment message sent by the access gateway through the intermediate gateway.

Step 104: Delete the buffered downlink packet.

When receiving an acknowledgment message from the access gateway, the method further includes: turning off the timer.

Step 105: Resend the downlink packet to the access gateway.

When there is more than one transmission link between the terminal and the top-level gateway, the re-sending of the downlink packet can be performed on the replacement link or on the original link to achieve better results.

In the embodiment of the present invention, when the number of repeated transmissions of the same packet reaches a preset threshold and the acknowledgement packet is not received, the exception processing procedure is started. The preset threshold for the number of times the same packet is repeatedly sent may be determined according to the networking situation.

2 is a schematic flowchart of a data transmission method according to Embodiment 2 of the present invention. As shown in FIG. 2, a data transmission method according to an embodiment of the present invention includes the following steps:

Step 201: Receive a downlink packet from the top-level gateway, and send the downlink packet to the terminal.

In this step, after receiving the downlink packet from the top-level gateway, the downlink packet is forwarded to the terminal through the air interface.

Step 202: Receive an acknowledgement message sent by the terminal, and when receiving the acknowledgement message, construct Acknowledge the message and send the acknowledgement message to the top-level gateway;

In the embodiment of the present invention, the top-level gateway refers to a gateway of the wireless network that accesses the Internet and finally accesses the Internet, and is responsible for the interconnection of user data between the wireless network and the Internet. The top-level gateway has an IP address assigned to the terminal, and the support is fixed. Control the integrity of the service link when the terminal moves, and the terminal negotiates and controls the quality of service (QOS, Quality of Service) attributes of the wireless channel, and controls the rate of packet transmission to avoid congestion of the transmission node in the wireless network. In the embodiment of the present invention, the capability of the top-level gateway is not limited to the above range.

FIG. 3 is a schematic flowchart of a data transmission method according to Embodiment 3 of the present invention. As shown in FIG. 3, the data transmission method in the embodiment of the present invention includes the following steps:

Step 301: The top-level gateway receives the downlink packet from the Internet.

Step 302: The top-level gateway caches the downlink packet and sends the downlink packet to the access gateway.

When the top-level gateway caches the downlink packet, the method further includes: starting a timer;

The sending, by the top-level gateway, the downlink packet to the access gateway includes: directly sending the encapsulated downlink packet to the access gateway, and/or sending the encapsulated downlink packet to the access through the intermediate gateway Gateway

Step 303: The access gateway sends the downlink packet to the terminal.

In this step, after receiving the downlink packet from the top-level gateway, the access gateway forwards the downlink packet to the terminal through the air interface.

Step 304: The access gateway receives the acknowledgement message sent by the terminal, and when receiving the acknowledgement message, constructs an acknowledgement message, and sends the acknowledgement message to the top-level gateway.

Step 305: The top-level gateway detects whether a confirmation from the access gateway is received within a preset time. The message, when receiving the confirmation message from the access gateway, step 306; otherwise, step 307;

The apex gateway detects whether the acknowledgment message from the access gateway is received within a preset time period: detecting whether an acknowledgment message from the access gateway is received within a preset time of the timer; The time can be set according to the networking situation.

The detecting, by the top-level gateway, whether the acknowledgment message from the access gateway is received includes: detecting whether an acknowledgment message directly from the access gateway is received, and/or an acknowledgment message sent by the access gateway through the intermediate gateway.

Step 306: The top-level gateway deletes the buffered downlink packet.

When the top-level gateway receives the acknowledgement message from the access gateway, the method further includes: turning off the timer.

Step 307: The top-level gateway resends the downlink packet to the access gateway.

When the number of repeated transmissions of the same packet reaches the preset threshold and the acknowledgement packet is not received, the top-level gateway starts an exception processing procedure. The preset threshold for the number of times the same packet is repeatedly sent may be determined according to the networking situation.

Various embodiments of the technical solution of the present invention will be described in detail below with reference to the embodiments. The following disclosed embodiments are described based on the 3GPP LTE related protocol, and the technical solutions provided by the embodiments of the present invention are mainly described. The processes and details related to the original 3GPP LTE protocol and the technical solutions of the embodiments of the present invention are implemented. In the case, fade or ignore the processing. The embodiments disclosed in the following are only based on the 3GPP LTE standard, but are not limited to this scope, and are not limited to the LTE standard. Any technical person skilled in the art can easily change the technical solution according to the embodiment of the present invention. The solution should be within the scope of the present invention.

4 is a schematic flowchart of a data transmission method according to Embodiment 4 of the present invention. The embodiment shown in FIG. 4 is a processing procedure when a single link exists between a top-level gateway and an access gateway, as shown in FIG. 4, the data transmission method according to an embodiment of the present invention is shown in FIG. Includes the following steps:

Step 401: The terminal establishes a connection with the service server of the Internet through the 4G wireless network, and receives the downlink packet sent by the service server sent by the service server.

Step 402: The service server sends a downlink packet to the top-level gateway.

Step 403: The top-level gateway receives the downlink packet, caches the downlink packet, and starts a timer to wait for a response message.

In a 4G network, a top-level gateway generally refers to a Public Data Network Gateway (PGW); in a 2G or 3G network, a top-level gateway generally refers to a Gateway General Packet Radio Service Support Node (GGSN). For other systems, the top-level gateway refers to functional entities like PGW and GGSN;

The setting of the timer may be different in different networking environments. For example, the delay of the transmission path of the wireless system may be determined in advance, and the value of the timeout timer may be determined by referring to the TCP protocol;

Step 404: The top-level gateway encapsulates the received downlink packet according to the relevant wireless protocol.

The field for encapsulating the downlink packet includes a unique identifier that distinguishes the downlink packet;

The related wireless protocol for encapsulating the downlink packet is not limited in this patent. For 2G, 3G, and 4G, the related wireless protocol may be a protocol such as 3GPP 29.060 or 3GPP 23.401, and correspondingly, the downlink packet is distinguished. The unique identifier is the combination of the serial number of the GTP User plane (GTPU, GTP User plane) header, the GTPU TEID (Tunnel Endpoint identifier), and the GTPU IP address. For other standards, the relevant protocol refers to similar Similar agreements for 2G, 3G, 4G protocols;

Step 405: The top-level gateway sends the encapsulated downlink packet to the access gateway.

Step 406: After receiving the downlink packet, the access gateway records a unique identifier in the downlink packet.

Step 407: The access gateway sends the downlink packet to the terminal through an air interface.

In a 4G network, an access gateway generally refers to an evolved base station (eNB), and in a 2G network, an access gateway generally refers to a base station controller (BSC, Base Station Controller) and a base station; The access gateway refers to a Radio Network Controller (RNC) and a base station; for other systems, the access gateway refers to a functional entity similar to the eNB, the BSC, and the RNC;

The behavior of the access gateway transmitting the downlink packet to the terminal through the air interface is not limited in this patent. For 4G, reference may be made to the 3GPP 36 series protocol; for other standards, refer to the similar 3GPP 36 series protocol of the standard;

Step 408: After receiving the downlink packet, the terminal sends an acknowledgement message to the access gateway.

Step 409: When receiving the acknowledgment message sent by the terminal, the access gateway uses the recorded downlink message to uniquely identify the acknowledgment message.

In this step, the acknowledgement message can be constructed in any manner that can be recognized by the top-level gateway.

Step 410: The access gateway sends the acknowledgement message to the top-level gateway.

Step 411: When the top-level gateway receives the acknowledgement packet, extract the unique identifier of the response packet, find and stop the downlink packet corresponding timer according to the unique identifier, and then find and delete the cached downlink. Text.

In the embodiment of the present invention, in the step 411, the top-level gateway does not receive the acknowledgement packet due to various reasons, such as ground transmission congestion between the top-level gateway and the access gateway, abnormal access gateway processing, and loss of air interface connection. The top-level gateway resends the buffered downlink message and resets the timer, that is, the process of steps 404 to 410 is re-executed. If resending If the correct acknowledgement packet is obtained, go to step 411. The top-level gateway deletes the buffered downlink packet and stops the timer. Otherwise, the re-send is performed again. If the same packet is sent multiple times, the correct response cannot be obtained. The gateway initiates an exception handling process, such as terminating the wireless connection of the UE.

5 is a schematic flowchart of a data transmission method according to Embodiment 5 of the present invention. The embodiment shown in FIG. 5 is a processing procedure when a double link exists between a top-level gateway and an access gateway, as shown in FIG. 5, the data transmission method of the embodiment of the present invention is shown in FIG. Includes the following steps:

Step 501: The terminal establishes a connection with the service server of the Internet through the 4G wireless network, and receives the downlink packet sent by the service server sent by the service server.

In this step, there is a double link between the top-level gateway and the access gateway in the wireless network, for example, a dual link of LTE+Wifi;

Step 502: The service server sends multiple downlink packets to the top-level gateway.

For example, the service server sends two downlink packets to the top-level gateway: downlink packet 1 and downlink packet 2;

Step 503: The top-level gateway receives the downlink packet 1 and the downlink packet 2, buffers the two downlink packets, and starts timer 1 and timer 2 for the downlink packet 1 and the downlink packet 2, respectively, waiting Response message

Here, the top-level gateway may be a PGW;

Step 504: The top-level gateway encapsulates the received downlink packet 1 and downlink packet 2 according to the relevant wireless protocol.

The field that encapsulates the downlink packet includes an identifier that uniquely distinguishes the downlink packet 1 and the downlink packet 2: a unique identifier 1 and a unique identifier 2; in this step, the top-level gateway downlink packet 1 And the encapsulation manner of the downlink packet 2 is the same as the step 404;

Step 505: The top-level gateway sends the encapsulated downlink packet 1 to the access gateway 1, and sends the encapsulated downlink packet 2 to the access gateway 2;

The access gateway 1 may be an eNB, and the access gateway 2 may be an access point (AP, Access). Point);

Step 506: After receiving the downlink packet 1, the access gateway 1 records the unique identifier 1 of the downlink packet. After receiving the downlink packet 2, the access gateway 2 records the downlink packet. The only indication of 2 is 2;

Step 507: The access gateway 1 sends the downlink packet 1 to the terminal through the air interface; the access gateway 2 sends the downlink packet 2 to the terminal through the air interface;

Step 508: After receiving the downlink packet, the terminal sends an acknowledgement message 1 and an acknowledgement message 2 to the access gateway 1 and the access gateway 2 respectively;

Step 509: When receiving the acknowledgment message 1 sent by the terminal, the access gateway 1 constructs the acknowledgment message 1 by using the recorded message unique identifier 1; when the access gateway 2 receives the acknowledgment message 2 sent by the terminal, the access gateway 2 uses The recorded message unique identifier 2 constructs the confirmation message 2;

Step 510: The access gateway 1 sends the acknowledgement message 1 to the top-level gateway; the access gateway 2 sends the acknowledgement message 2 to the top-level gateway;

Step 511: When the top-level gateway receives the acknowledgement packet 1, extract the unique identifier 1 of the response packet, find and stop the downlink packet 1 corresponding to the timer 1 according to the unique identifier 1, and then find and delete the cache. When the acknowledgment message 2 is received, the top-level gateway extracts the unique identifier 2 of the response packet, finds and stops the downlink packet 2 corresponding to the timer 2 according to the unique identifier 2, and then finds and Delete cached downstream packet 2.

6 is a schematic flowchart of a data transmission method according to Embodiment 6 of the present invention. The embodiment shown in FIG. 6 is an exception processing process when a double link exists between a top-level gateway and an access gateway. As shown in FIG. 6, the data transmission is performed in the embodiment of the present invention. The method includes the following steps:

Step 601: The terminal establishes a connection with the service server of the Internet through the 4G wireless network, and receives the downlink packet sent by the service server sent by the service server.

In this step, there is a double link between the top-level gateway and the access gateway in the wireless network, for example, a dual-link scenario of LTE+Wifi;

Step 602: The service server sends a downlink packet to the top-level gateway.

Step 603: The top-level gateway receives the downlink packet, caches the downlink packet, starts a timer, and waits for a response message.

Step 604: The top-level gateway encapsulates the received downlink packet according to the relevant wireless protocol.

In this step, the field that encapsulates the downlink packet includes a unique identifier that distinguishes the downlink packet.

Step 605: The top-level gateway sends the encapsulated downlink packet to the access network 1;

Here, the access gateway 1 may be an eNB;

Step 606: After receiving the downlink packet, the access gateway 1 fails to send the downlink packet to the terminal due to the abnormality.

The abnormal reasons mentioned here include, but are not limited to, abnormal processing of the access gateway, loss of air interface connection, and the like;

Step 607: The timer corresponding to the downlink packet in the top-level gateway still fails to receive the acknowledgement packet from the access gateway.

Step 608: The top-level gateway sends the downlink packet to the access gateway 2;

In this step, the access gateway 2 may be an AP;

Step 609: After receiving the downlink packet, the access gateway 2 accesses the gateway to record a unique identifier in the downlink packet.

Step 610: The access gateway 2 sends the downlink packet to the terminal through an air interface.

Step 611: After receiving the downlink packet, the terminal sends an acknowledgement message to the access gateway 2;

Step 612: When receiving the acknowledgment message sent by the terminal, the access gateway 2 uses the recorded message to uniquely identify the acknowledgment message.

Step 613: The access gateway 2 sends the acknowledgement message to the top-level gateway.

Step 614: When the top-level gateway receives the acknowledgement packet, extract the unique identifier of the response packet, find and stop the timer corresponding to the downlink packet according to the unique identifier, and then find and The cached downlink packet is deleted.

FIG. 7 is a schematic flowchart of a data transmission method according to Embodiment 7 of the present invention. The embodiment shown in FIG. 7 is a processing procedure when an intermediate gateway exists between a top-level gateway and an access gateway, as shown in FIG. 7, the data transmission method according to the embodiment of the present invention is shown in FIG. Includes the following steps:

Step 701: The terminal establishes a connection with the service server of the Internet through the 4G wireless network, and receives the downlink packet sent by the service server sent by the service server.

Step 702: The service server sends a downlink packet to the top-level gateway.

Step 703: The top-level gateway receives the downlink packet, caches the downlink packet, starts a timer, and waits for a response message.

Step 704: The top-level gateway encapsulates the received downlink packet according to the relevant wireless protocol.

Step 705: The top-level gateway sends the encapsulated downlink packet to the intermediate gateway.

In the embodiment of the present invention, the intermediate gateway generally refers to other gateways that may exist between the top-level gateway and the access gateway. For example, in a 4G network, the intermediate gateway may be a service gateway (SGW, Service Gateway; in a 2G, 3G network, the intermediate gateway may be a service general packet radio service support node (SGSN, Serving General Packet Radio Service Support Node). For other systems, the intermediate gateway refers to a network element similar to the SGW and the SGSN. This embodiment is described based on the existence of the intermediate gateway.

Step 706: The intermediate gateway performs GTPU decapsulation on the downlink packet, obtains the unique identifier of the downlink packet, and then performs GTPU encapsulation on the packet, and uses the sequence number of the new GTPU packet as the new downlink packet. a unique identifier; and record the correspondence between the old and new unique identifiers of the downlink message;

In the embodiment of the present invention, the intermediate gateway may record the unique identifier of the packet before and after decapsulation and re-encapsulation, that is, the GTPU sequence number, and replace the acknowledgement packet received from the terminal; or directly use the top-level gateway to encapsulate Unique identifier sent to the access gateway In this case, the intermediate gateway does not need to record the old and new unique identifiers, but needs to ensure the uniqueness of the unique identifiers, and avoids conflicts between the unique identifiers because there are multiple top-level gateways and multiple intermediate gateways in the system.

Step 707: The intermediate gateway sends the re-encapsulated downlink packet to the access gateway.

Step 708: After receiving the downlink packet, the access gateway records a unique identifier in the downlink packet.

Here, after the intermediate gateway re-encapsulates the downlink packet in step 706, the unique identifier in the downlink packet received by the access gateway is a new unique identifier generated after re-encapsulation.

Step 709: The access gateway sends the downlink packet to the terminal through an air interface.

Step 710: After receiving the downlink packet, the terminal sends an acknowledgement message to the access gateway.

Step 711: When receiving the acknowledgment message sent by the terminal, the access gateway uses the recorded downlink message to uniquely identify the acknowledgment message.

Step 712: The access gateway sends the acknowledgement packet to the intermediate gateway.

Step 713: The intermediate gateway replaces the unique identifier in the received acknowledgement packet according to the stored correspondence between the old and new unique identifiers of the downlink packet, and replaces the new unique identifier in the downlink packet with the original identifier. Old unique identifier;

In this embodiment of the present invention, when the intermediate gateway directly uses the unique identifier encapsulated by the top-level gateway to send the downlink packet to the access gateway, the step does not need to be performed;

Step 714: The intermediate gateway sends the acknowledgement message to the top-level gateway.

Step 715: When the top-level gateway receives the acknowledgement packet, extract the unique identifier of the response packet, find and stop the downlink packet corresponding timer according to the unique identifier, and then find and delete the cached downlink. Text.

8 is a schematic flowchart of a data transmission method according to Embodiment 8 of the present invention. The process of simultaneously processing multiple downlink packets in the embodiment shown in FIG. 8 is as shown in FIG. 8. The data transmission method package according to the embodiment of the present invention is shown in FIG. Including the following steps:

Step 801: The terminal establishes a connection between the service server of the Internet through the 4G wireless network, and receives multiple downlink packets sent by the service server sent by the service server.

Step 802: The top-level gateway enables the congestion control mechanism, and first sends a received downlink packet from the Internet to the access gateway.

Step 803: The access gateway forwards the downlink packet, and performs a process of confirming the message receiving and confirming the packet. The process may refer to the packet forwarding process in any of the foregoing embodiments.

Step 804: The access gateway sends an acknowledgement message to the top-level gateway.

Step 805: The top-level gateway deletes the buffered downlink packet.

Step 806: The top-level gateway sends two downlink packets to the access gateway.

Step 807: The access gateway forwards the downlink packet, and performs a process of confirming the message receiving and confirming the packet. The process may refer to the packet forwarding process in any of the foregoing embodiments.

Step 808: The access gateway sends two acknowledgement messages to the top-level gateway.

Step 809: The top-level gateway deletes the buffered downlink packet.

Step 810: The top-level gateway gradually increases the number of downlink packets sent to avoid wireless system congestion.

The embodiment of the present invention further provides a data transmission device. FIG. 9 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention. The device is located at a top-level gateway. As shown in FIG. 9, the device includes: a downlink packet receiving module. 91, a cache module 92, a downlink packet sending module 93, an acknowledgement packet receiving module 94, and a processing module 95;

The downlink packet receiving module 91 is configured to receive a downlink packet from the Internet;

The cache module 92 is configured to cache the downlink packet.

In the embodiment of the present invention, the device further includes an encapsulating module 96, configured to encapsulate the received downlink packet data before the downlink packet is buffered and sent, and the encapsulating module 96 is configured to the downlink packet. The field to be encapsulated includes a unique identifier that distinguishes the downlink message. knowledge;

In the embodiment of the present invention, the device further includes a timer 97, configured to enable a timing function when the downlink packet is buffered;

The downlink packet sending module 93 is configured to send the downlink packet to an access gateway.

In the embodiment of the present invention, the downlink packet sending module 93 is configured to: directly send the downlink packet to the access gateway, and/or send the downlink packet to the access gateway through the intermediate gateway;

The acknowledgement message receiving module 94 is configured to receive an acknowledgement message from the access gateway.

The processing module 95 is configured to detect whether an acknowledgment message from the access gateway is received within a preset time, and when the acknowledgment message from the access gateway is received, delete the cached downlink message; otherwise, Resending the downlink packet to the access gateway;

The processing module 95 is configured to detect whether an acknowledgment message from the access gateway is received within a preset time of the timer, including detecting whether an acknowledgment message directly from the access gateway is received, and/or the access gateway passes The acknowledgement packet sent by the intermediate gateway.

The processing module 95 is further configured to: close the timer when receiving the acknowledgement message from the access gateway;

The processing module 95 retransmits the downlink packet to the access gateway. When there is more than one transmission link between the terminal and the top-level gateway, the re-sending of the downlink packet can be performed by replacing the link. It can also be done on the original link for better results.

When the number of times that the same packet is repeatedly sent reaches the preset threshold and the acknowledgment packet is not received, the processing module 95 is further configured to: when the number of repeated transmissions of the same packet reaches the preset threshold, the acknowledgment packet is still not received. Exception handling process. The preset threshold for the number of times the same packet is repeatedly sent may be determined according to the networking situation.

The embodiment of the present invention further provides a data transmission apparatus. FIG. 10 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention. The apparatus is located at an access gateway, and the apparatus according to FIG. 10 includes: a downlink packet receiving module 101 and a downlink. Text sending module 102, confirmation message receiving module 103, confirmation a message construction module 104, an acknowledgement message sending module 105, wherein

The downlink packet receiving module 101 is configured to receive a downlink packet from a top-level gateway;

The downlink packet sending module 102 is configured to send the downlink packet to the terminal;

In the embodiment of the present invention, the downlink packet sending module 102 forwards the downlink packet to the terminal through an air interface;

The confirmation message receiving module 103 is configured to receive an acknowledgement message sent by the terminal;

The confirmation message construction module 104 is configured to construct an acknowledgement message when the confirmation message is received;

The acknowledgement message sending module 105 is configured to send the acknowledgement message to the top-level gateway.

The embodiment of the present invention further provides a data transmission system, and FIG. 11 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention. As shown in FIG. 11, the system includes a top-level gateway 111 and an access gateway 112, where

The top-level gateway 111 is configured to receive a downlink packet from the Internet, cache the downlink packet, and send the downlink packet to the access gateway, and detect whether the acknowledgement packet from the access gateway is received within a preset time. Deleting the buffered downlink packet when receiving the acknowledgement packet from the access gateway; otherwise, the downlink packet is resent to the access gateway;

In the embodiment of the present invention, the top-level gateway 111 is further configured to encapsulate the received downlink packet data before the downlink packet is buffered and sent, and the field encapsulated in the downlink packet includes a difference. a unique identifier of the downlink packet;

In the embodiment of the present invention, the system may further include an intermediate gateway 113, configured to send the received downlink packet from the top-level gateway to the access gateway, and receive the received from the access gateway. Confirm that the message is sent to the top-level gateway;

The intermediate gateway generally refers to other gateways that may exist between the top-level gateway and the access gateway. For example, in a 4G network, the intermediate gateway may be an SGW; in a 2G or 3G network, the intermediate gateway may be an SGSN; for other systems, the intermediate gateway refers to a network element similar to the SGW and the SGSN. The intermediate gateway may or may not exist.

The access gateway 113 is configured to: decapsulate the downlink packet, obtain the unique identifier of the downlink packet, and then re-encapsulate the packet, and use the sequence number of the re-encapsulated downlink packet as the downlink. a new unique identifier of the packet; a correspondence between the old and new unique identifiers of the downlink packet; the re-encapsulated downlink packet is sent to the access gateway; and the access gateway 113 can directly use the top-level gateway The encapsulated unique identifier sends the downlink packet to the access gateway. In this case, the intermediate gateway 113 does not need to record the old and new unique identifiers, but needs to ensure the uniqueness of the unique identifier to avoid multiple top layers in the system. The gateway and multiple intermediate gateways cause the unique identifier to collide.

And receiving the acknowledgment message sent by the access gateway, and replacing the unique identifier in the received acknowledgment message according to the stored correspondence between the old and new unique identifiers of the downlink packet; and the new unique one in the downlink packet The identifier is replaced with the old old unique identifier; the acknowledgement message is sent to the top-level gateway.

The top-level gateway 111 is configured to: directly send the downlink packet to the access gateway 113, and/or send the downlink packet to the access gateway 112 through the intermediate gateway 113; and detect whether the direct access is received. The acknowledgment message of the gateway 112 and/or the acknowledgment message sent by the access gateway through the intermediate network 113.

When the downlink packet is buffered, the top-level gateway 111 is further configured to start a timer;

Correspondingly, the top-level gateway 111 is configured to: detect whether an acknowledgement message from the access gateway is received within a preset time of the timer; when the top-level gateway 111 receives the access network from the access network When the acknowledgement message is closed, the top-level gateway 111 is further configured to: close the timer. The preset time of the timer can be set according to the networking situation.

When the top-level gateway 111 retransmits the downlink packet to the access gateway, when there is more than one transmission link between the terminal and the top-level gateway, the re-sending of the downlink packet can be performed by replacing the link. , can also be carried out on the original link to achieve better results.

The top-level gateway 111 is further configured to start an exception processing process when the number of times the same packet is repeatedly sent reaches a preset threshold and the acknowledge packet is not received. The preset threshold for the number of times the same packet is repeatedly sent may be determined according to the networking situation.

The access gateway 112 is configured to send the downlink packet to the terminal, and receive an acknowledgement message sent by the terminal. When receiving the acknowledgement message, construct an acknowledgement packet, and send the acknowledgement packet to the top layer. Gateway

In the embodiment of the present invention, after receiving the downlink packet from the top-level gateway, the access gateway 112 forwards the downlink packet to the terminal through the air interface.

Each module in the data transmission device proposed in the embodiment of the present invention may be implemented by a processor, and may also be implemented by a specific logic circuit; wherein the processor may be a processor on a mobile terminal or a server, in practice In an application, the processor can be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP), or a field programmable gate array (FPGA).

In the embodiment of the present invention, if the above data transmission method is implemented in the form of a software function module, and is sold or used as an independent product, it may also be stored in a computer readable storage medium. Quality. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Correspondingly, an embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a computer program for executing the data transmission method described in FIG.

The embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores a computer program for executing the data transmission method described in FIG. 2 .

The embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores a computer program for executing the data transmission method described in FIG. 3 to FIG.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

A data transmission method, the method comprising:

Receiving a downlink packet from the Internet, buffering the downlink packet, and sending the downlink packet to the access gateway;

Detecting whether an acknowledgment message from the access gateway is received, and deleting the buffered downlink packet when receiving the acknowledgment message from the access gateway; otherwise, resending the downlink packet Go to the access gateway.
The method of claim 1, wherein when the downlink message is buffered, the method further comprises: starting a timer;

Correspondingly, the detecting, in the preset time, whether the acknowledgment message from the access gateway is received is: detecting whether an acknowledgment message from the access gateway is received within a preset time of the timer;

Correspondingly, when receiving the acknowledgement message from the access gateway, the method further comprises: turning off the timer.
The method according to claim 1, wherein the method further comprises: when the number of repeated transmissions of the same message reaches a preset threshold and still does not receive the confirmation message, the exception processing flow is started.
The method of claim 1, wherein the sending the downlink message to the access gateway comprises: directly sending the downlink message to the access gateway, and/or sending the downlink message to the intermediate gateway Access gateway

Correspondingly, the detecting whether the acknowledgment message from the access gateway is received includes: detecting whether an acknowledgment message directly from the access gateway is received, and/or an acknowledgment message sent by the access gateway through the intermediate gateway.
A data transmission method, the method comprising:

Receiving a downlink packet from the top-level gateway, and sending the downlink packet to the terminal;

Receiving an acknowledgment message sent by the terminal, when receiving the acknowledgment message, constructing an acknowledgment message, and sending the acknowledgment message to the top-level gateway.
A data transmission method, wherein the method comprises:

The top-level gateway receives the downlink packet from the Internet, caches the downlink packet, and sends the downlink packet to the access gateway;

The access gateway sends the downlink packet to the terminal; the acknowledgment message sent by the terminal, when receiving the acknowledgment message, constructs an acknowledgment message, and sends the acknowledgment message to the top-level gateway;

The apex gateway detects whether the acknowledgment message from the access gateway is received within the preset time. When receiving the acknowledgment message from the access gateway, the cached downlink packet is deleted; otherwise, the downlink packet is received. Resend to the access gateway.
The method of claim 6, wherein when the top-level gateway caches the downlink packet, the method further includes: starting a timer;

Correspondingly, the apex gateway detects whether the acknowledgment message from the access gateway is received within a preset time period: detecting whether an acknowledgment message from the access gateway is received within a preset time of the timer;

Correspondingly, when the top-level gateway receives the acknowledgement message from the access gateway, the method further includes: turning off the timer.
The method according to claim 6, wherein the method further comprises: when the number of repeated transmissions of the same packet reaches a preset threshold and the acknowledgement message is not received, the top gateway starts an exception processing procedure.
The method of claim 6, wherein the sending, by the top-level gateway, the downlink message to the access gateway comprises: sending, by the top-level gateway, the downlink message to the access gateway, and/or through the intermediate gateway The downlink packet is sent to the access gateway;

Correspondingly, the detecting, by the top-level gateway, whether the acknowledgment message is received from the access gateway comprises: detecting, by the top-level gateway, whether an acknowledgment message directly from the access gateway is received, and/or the access gateway sends the message through the intermediate gateway. Confirm the message.
A data transmission device, the device is located at a top-level gateway, and the device includes: a downlink packet receiving module, a buffer module, a downlink packet sending module, an acknowledgement packet receiving module, and a processing module;

The downlink packet receiving module is configured to receive a downlink packet from the Internet;

The cache module is configured to cache the downlink packet.

The downlink packet sending module is configured to send the downlink packet to an access gateway;

The acknowledgement message receiving module is configured to receive an acknowledgement message from the access gateway;

The processing module is configured to detect whether an acknowledgment message from the access gateway is received within a preset time, and when the acknowledgment message from the access gateway is received, delete the cached downlink message; otherwise, The downlink packet is resent to the access gateway.
The device according to claim 10, wherein the device further comprises a timer configured to enable a timing function when the downlink message is buffered;

Correspondingly, the processing module is configured to detect whether an acknowledgement message from the access gateway is received within a preset time of the timer;

When receiving an acknowledgment message from the access gateway, the processing module is further configured to: close the timer.
The apparatus according to claim 10, wherein the processing module is further configured to: when an repeated number of times the same message is repeatedly sent reaches a preset threshold and no acknowledgement message is received, the exception processing flow is started.
The device according to claim 10, wherein the downlink packet sending module is configured to: directly send the downlink packet to the access gateway, and/or send the downlink packet to the access gateway through the intermediate gateway;

Correspondingly, the processing module is configured to: detect whether an acknowledgment message directly from the access gateway is received, and/or an acknowledgment message sent by the access gateway through the intermediate gateway.
A data transmission device, the device is located at an access gateway, and the device includes: a line message receiving module, a downlink message sending module, an acknowledgment message receiving module, an acknowledgment message building module, and an acknowledgment message sending module, wherein

The downlink packet receiving module is configured to receive a downlink packet from the top-level gateway;

The downlink packet sending module is configured to send the downlink packet to the terminal;

The confirmation message receiving module is configured to receive an acknowledgement message sent by the terminal;

The confirmation message construction module is configured to: when receiving the confirmation message, construct an acknowledgement message;

The acknowledgement message sending module is configured to send the acknowledgement message to the top-level gateway.
A data transmission system, the system comprising a top-level gateway and an access gateway, wherein

The top-level gateway is configured to receive a downlink packet from the Internet, cache the downlink packet, and send the packet to the access gateway, and detect whether the acknowledgement packet from the access gateway is received within a preset time. And when the acknowledgment message from the access gateway is received, the buffered downlink packet is deleted; otherwise, the downlink packet is resent to the access gateway;

The access gateway is configured to send the downlink packet to the terminal, and receive an acknowledgement message sent by the terminal. When receiving the acknowledgement message, construct an acknowledgement message, and send the acknowledgement packet to the top-level gateway. .
The system of claim 15, wherein the top-level gateway is further configured to start a timer when the downlink message is buffered;

Correspondingly, the top-level gateway is configured to: detect whether an acknowledgement message from the access gateway is received within a preset time of the timer;

When the top-level gateway receives the acknowledgement message from the access gateway, the top-level gateway is further configured to: close the timer.
The system of claim 15, wherein the top-level gateway is further configured to start an exception handling process when the number of times the same packet is repeatedly sent reaches a preset threshold and the acknowledgement message is not received.
The system of claim 15, wherein the top-level gateway is configured to: directly send the downlink packet to an access gateway, and/or send the downlink packet to an access gateway through an intermediate gateway;

It is detected whether an acknowledgment message directly from the access gateway and/or an acknowledgment message sent by the access gateway through the intermediate gateway are received.
A computer storage medium having stored therein computer executable instructions for performing the service scheduling method of any one of claims 1 to 4.
A computer storage medium having stored therein computer executable instructions for performing the service scheduling method of claim 5.
A computer storage medium having stored therein computer executable instructions for performing the service scheduling method of any one of claims 6 to 9.